CN114687866A

CN114687866A - Gas turbine system capable of adjusting heat value of natural gas

Info

Publication number: CN114687866A
Application number: CN202011619493.9A
Authority: CN
Inventors: 卢辉; 潘千里; 李海旺; 杨光; 王志晓; 王海浩; 杨智; 杨君君; 罗建超; 朱富强; 何垚年; 崔永军; 王宝生
Original assignee: Huaneng Beijing Thermal Power Co Ltd
Current assignee: Huaneng Beijing Thermal Power Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-07-01

Abstract

The embodiment of the invention provides a gas turbine system capable of adjusting the heat value of natural gas, which comprises a gas turbine system, a natural gas heat value adjusting system and a gas turbine inlet temperature control system; the natural gas conveying pipeline is connected to the gas inlet end of the gas compressor and used for conveying natural gas to the gas compressor; one end of the nitrogen conveying pipeline is communicated with a nitrogen source, and the other end of the nitrogen conveying pipeline is communicated with the natural gas conveying pipeline and is used for filling nitrogen into the natural gas conveying pipeline so that the natural gas in the natural gas conveying pipeline is mixed with the filled nitrogen; the nitrogen charging regulating valve is arranged on the nitrogen conveying pipeline and is used for controlling the amount of nitrogen charged into the natural gas conveying pipeline; a sampling pipe is led out from a natural gas conveying pipeline between the nitrogen conveying pipeline and the gas compressor; the heat value instrument is arranged on the sampling pipe and is used for monitoring the heat value of the natural gas after the nitrogen is added into the sampling pipe; the signal output end of the heat value instrument is electrically connected with the control device, and the control end of the nitrogen charging gate is electrically connected with the control device.

Description

Gas turbine system capable of adjusting heat value of natural gas

Technical Field

The invention relates to the technical field of gas turbines, in particular to a gas turbine system capable of adjusting the heat value of natural gas.

Background

With the large operation of domestic gas turbine power plants, in order to reduce the operating cost of the power plants, the improvement of the efficiency of a gas-steam combined cycle unit becomes an important subject in recent years. For a gas-steam combined cycle unit, the operating mode and efficiency of the gas turbine directly affect the efficiency of the entire combined cycle unit.

The gas turbine is a device which uses natural gas as chemical fuel, converts chemical energy into mechanical energy through combustion, and converts the mechanical energy into electric energy through a generator. The change of the natural gas heat value has great influence on the combustion stability of the gas turbine, each gas turbine manufacturer has a special specified range for the natural gas heat value, and under the condition of a certain specific natural gas heat value, the gas turbine manufacturer can perform combustion adjustment, but the combustion adjustment consumes a long time and has the risk of trip, so that the power plant is difficult to arrange a proper time for adjustment test. Therefore, it is difficult to adjust the combustion in response to changes in the natural gas heat value. When the calorific value of the natural gas is changed greatly, the combustion-air ratio set in front of the combustion chamber cannot meet the combustion under the current calorific value of the gas, so that the pressure fluctuation of the combustion chamber of the gas turbine is large, a unit is tripped, great economic loss can be caused to a power plant, and the service life of the gas turbine can be shortened. However, in the actual operation process, because the natural gas heat value is completely determined by an upstream gas supply company, the power plant cannot intervene and can only passively accept the intervention, and when the natural gas heat value is increased, the natural gas heat value cannot be adjusted, so that the operation stability of the gas turbine is greatly influenced.

In addition, the temperature of the gas turbine inlet has a large effect on its performance, depending on the operating characteristics of the gas turbine. On one hand, because the output of the gas turbine is in a linear relation with the ambient temperature, the output of the gas turbine cannot reach the output of a nameplate under the working condition of large load in summer in the environment with higher temperature, the output of the gas turbine is blocked to be a necessary phenomenon when the gas turbine runs under the large load in summer, the characteristic of the gas turbine is subjected to scaling during power grid dispatching and even directly influences the utilization hour guarantee of the gas turbine, so that the characteristic that the performance of the gas turbine is obviously influenced by the air inlet condition directly influences the power plant to meet the demand capability and the self benefit of the power plant, and the key of keeping the output of the gas turbine in summer, realizing the peak operation in summer and improving the load capability of the gas turbine power plant lies in the air inlet and cooling of the gas turbine. On the other hand, the main factors influencing the efficiency of the gas-steam combined cycle power plant include equipment type selection in the construction period, system design, main parameters, index determination, operation mode in the operation period, unit load rate, temperature before turbine of the gas turbine, main parameters (temperature, pressure and flow) of a waste heat boiler (steam turbine), and cold end loss, but most of the factors of the unit which is put into operation cannot be controlled by the power plant, the efficiency of the whole combined cycle is improved only by increasing the temperature before the turbine and reducing the cold end loss, and according to the operation characteristic of the gas turbine, the higher the temperature before the turbine of the gas turbine is, the higher the unit efficiency is, so that the unit efficiency can be improved by heating the inlet temperature of the gas turbine under the condition of partial load. That is to say, the intake air temperature of the combustion engine needs to be adjusted correspondingly according to the external working environment temperature, but in the prior art, the adjustment of the intake air temperature of the combustion engine can only be realized through a single increasing or decreasing mode, the adjustment mode is relatively single, only the intake air temperature of the combustion engine can be increased or decreased, and the intake air temperature of the combustion engine cannot be adjusted according to different requirements of the operating conditions.

Disclosure of Invention

The present specification provides a gas turbine system with an adjustable natural gas heating value to overcome at least one technical problem in the prior art.

According to the embodiment of the specification, a gas turbine system capable of adjusting the heat value of natural gas is provided, and comprises a gas turbine system, a natural gas heat value adjusting system and a gas turbine inlet temperature control system; wherein:

the gas turbine system comprises a gas turbine, a gas filter, a gas compressor, a cooling tower, a closed cold water heat exchanger, a closed cold water return pipe, a closed cold water supply pipe, a secondary drainage cooler, a first valve and a second valve; the gas compressor is connected with the gas filter; the gas filter is communicated with a gas inlet of a combustion chamber of the gas turbine; the cooling tower is communicated with the closed water heat exchanger and is used for supplying a cooling water source to the closed water heat exchanger; the closed cold water return pipe is connected to a water inlet of the closed cold water heat exchanger; the first valve is arranged on the closed cold water return pipe and used for controlling the circulation of closed cold water return water in the closed cold water return pipe; the closed cold water supply pipe is connected to the water outlet of the closed cold water heat exchanger; the second valve is arranged on the closed cold water supply pipe and is used for controlling the circulation of closed cold water in the closed cold water supply pipe; the water inlet end of the secondary drainage cooler is communicated with the cold water supply pipe, and the water outlet end of the secondary drainage cooler is communicated with the cold water return pipe;

the natural gas calorific value adjusting system comprises a natural gas conveying pipeline, a nitrogen filling regulating valve, a sampling pipe, a calorific value instrument and a control device; the natural gas conveying pipeline is connected to the gas inlet end of the gas compressor and used for conveying natural gas to the gas compressor; one end of the nitrogen conveying pipeline is communicated with a nitrogen source, and the other end of the nitrogen conveying pipeline is communicated with the natural gas conveying pipeline and is used for filling nitrogen into the natural gas conveying pipeline so as to mix the natural gas in the natural gas conveying pipeline with the filled nitrogen; the nitrogen charging regulating valve is arranged on the nitrogen conveying pipeline and is used for controlling the amount of nitrogen charged into the natural gas conveying pipeline; leading out a path of the sampling pipe on the natural gas conveying pipeline between the nitrogen conveying pipeline and the gas compressor; the heat value instrument is arranged on the sampling pipe and is used for monitoring the heat value of the natural gas after the nitrogen is added into the sampling pipe; the signal output end of the heat value instrument is electrically connected with the control device, and the control end of the nitrogen charging regulating gate is electrically connected with the control device;

the heat value instrument monitors the heat value of the natural gas in the natural gas conveying pipeline in real time through the sampling pipe, the measured heat value of the natural gas is communicated to the control device, the control device compares the received heat value of the natural gas with a preset natural gas heat value threshold value and obtains a comparison result, when the received heat value of the natural gas is larger than the natural gas heat value threshold value, the control device generates a natural gas heat value regulating and controlling instruction according to the comparison result and sends the natural gas heat value regulating and controlling instruction to the control end of the nitrogen-filled regulating valve, and the nitrogen-filled regulating valve regulates the opening of the valve according to the natural gas heat value regulating and controlling instruction so as to control the nitrogen adding amount of the natural gas in the natural gas conveying pipeline and further regulate the heat value of the natural gas;

the gas turbine inlet air temperature control system comprises an air heat exchanger, a heat exchange water inlet pipeline, a third valve, a heat exchange water outlet pipeline, a fourth valve, a first pump body, a cooling water inlet pipe, a fifth valve, a cooling water outlet pipe, a sixth valve, a first heating water inlet pipe, a seventh valve, a first heating water outlet pipe, an eighth valve, a second heating water inlet pipe, a ninth valve, a second heating water outlet pipe, a tenth valve, a water guide pipe, an eleventh valve and a lithium bromide device; the air outlet of the air heat exchanger is communicated with the air inlet of the compressor of the gas turbine; the heat exchange water inlet pipeline is connected to the water inlet end of the air heat exchanger; the third valve is arranged on the heat exchange water inlet pipeline and used for controlling the water inlet quantity of the air heat exchanger; the heat exchange water outlet pipeline is connected to the water outlet end of the air heat exchanger; the fourth valve is arranged on the heat exchange water outlet pipeline and used for controlling the water outlet quantity of the air heat exchanger; the first pump body is arranged on the heat exchange water outlet pipeline between the air heat exchanger and the fourth valve; one end of the cooling water inlet pipe is communicated with a water outlet of the lithium bromide device, and the other end of the cooling water inlet pipe is communicated with the heat exchange water inlet pipeline and used for conveying air conditioner cold water to the air heat exchanger through the heat exchange water inlet pipeline; the fifth valve is arranged on the cooling water inlet pipe and used for controlling the circulation of air conditioner cold water in the cooling water inlet pipe; one end of the cooling water outlet pipe is communicated with a water inlet of the lithium bromide device, and the other end of the cooling water outlet pipe is communicated with the heat exchange water outlet pipeline and used for conveying the air conditioner cold water subjected to heat exchange back into the lithium bromide device; the sixth valve is arranged on the cooling water outlet pipe and used for controlling the water flow flux in the cooling water outlet pipe; one end of the first heating water inlet pipe is communicated with the heat exchange water inlet pipeline, and the other end of the first heating water inlet pipe is communicated with the closed cold water return pipe between the first valve and the secondary drainage cooler and used for conveying closed cold water return water to the air heat exchanger through the heat exchange water inlet pipeline; the seventh valve is arranged on the first heating water inlet pipe and used for controlling the delivery quantity of closed cold water return water in the first heating water inlet pipe; one end of the first heating water outlet pipe is communicated with the heat exchange water outlet pipeline, and the other end of the first heating water outlet pipe is communicated with the closed cold water supply pipe positioned between the second valve and the secondary drainage cooler and used for conveying closed cold water return water after heat exchange to the closed cold water supply pipe; the eighth valve is arranged on the first heating water outlet pipe and used for controlling the water flow flux in the first heating water outlet pipe; one end of the second heating water inlet pipe is communicated with the heat exchange water inlet pipeline, and the other end of the second heating water inlet pipe is communicated with the water outlet of the secondary drainage cooler and used for conveying a heating water source to the air heat exchanger through the heat exchange water inlet pipeline; the ninth valve is arranged on the second heating water inlet pipe and used for controlling the flow of the heating water source in the second heating water inlet pipe; one end of the second heating water outlet pipe is communicated with the heat exchange water outlet pipeline, and the other end of the second heating water outlet pipe is communicated with a water inlet of the secondary drainage cooler and is used for conveying a heating water source after heat exchange into the secondary drainage cooler; the tenth valve is arranged on the second heating water outlet pipe and used for controlling the water flow flux in the second heating water outlet pipe; the water conduit is connected to the second heating water outlet pipe between the heat exchange water outlet pipeline and the tenth valve and is used for conveying medium water to the secondary drainage cooler through the second heating water outlet pipe; the eleventh valve is arranged on the water diversion pipe and used for controlling the flow rate of intermediate water in the water diversion pipe;

when the air heat exchanger is not in operation, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve and the eleventh valve are closed, and the first valve and the second valve are opened; closed cold water flows out of the closed cold water heat exchanger, flows into the secondary hydrophobic cooler through the closed cold water supply pipe, cools secondary hydrophobic of a heat supply network in the secondary hydrophobic cooler, and closed cold water return water is conveyed back to the closed cold water heat exchanger through the closed cold water return pipe;

when the air heat exchanger is put into operation to reduce the air inlet temperature of the compressor of the gas turbine, the seventh valve, the eighth valve, the ninth valve, the tenth valve and the eleventh valve are closed, and the first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are opened; the secondary drainage of a heat supply network in the secondary drainage cooler is cooled by the cold water flowing out of the cold water heat exchanger; air conditioner cold water generated by the lithium bromide device is conveyed into the air heat exchanger through the cooling water inlet pipe and the heat exchange water inlet pipeline, air is cooled in the air heat exchanger, the cooled air enters the air compressor through an air compressor air inlet of the gas turbine, and the air conditioner cold water after heat exchange sequentially flows through the heat exchange water outlet pipeline and the cooling water outlet pipe under the action of the first pump body and is conveyed back into the lithium bromide device;

when the air heat exchanger is put into operation to raise the air inlet temperature of the compressor of the gas turbine, the first valve, the second valve, the fifth valve, the sixth valve, the ninth valve, the tenth valve and the eleventh valve are closed, and the third valve, the fourth valve, the seventh valve and the eighth valve are opened; the closed cold water backwater in the closed cold water backwater pipe is sequentially conveyed into the air heat exchanger through the first heating water inlet pipe and the heat exchange water inlet pipe, heat exchange is carried out between the air heat exchanger and air, the heated air after heat exchange enters the air compressor through the air inlet of the air compressor of the gas turbine, and the closed cold water backwater cooled after heat exchange is conveyed into the closed cold water supply pipe through the heat exchange water outlet pipe and the first heating water outlet pipe under the action of the first pump body; or,

when the air heat exchanger is put into operation to raise the air inlet temperature of the compressor of the gas turbine, the first valve, the second valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve are closed, and the third valve, the fourth valve, the ninth valve, the tenth valve and the eleventh valve are opened; the intermediate water is introduced by the water conduit and is conveyed to the secondary drainage cooler through the second heating water outlet pipe, secondary drainage of a heat supply network is cooled in the secondary drainage cooler, the intermediate water heated after heat exchange is conveyed to the air heat exchanger through the second heating water inlet pipe and the heat exchange water inlet pipe in sequence, air is heated in the air heat exchanger, the heated air enters the gas turbine through a gas compressor air inlet of the gas turbine, and the intermediate water cooled after heat exchange is conveyed back to the secondary drainage cooler through the heat exchange water outlet pipe and the second heating water outlet pipe under the action of the first pump body to cool the secondary drainage of the heat supply network in the secondary drainage cooler for circulating heat exchange.

Optionally, the nitrogen-charging regulating valve is a pneumatic regulating valve.

Optionally, the nitrogen conveying pipeline and the sampling pipe are both made of low-carbon stainless steel pipes, and the inner walls of the steel pipes are subjected to electrolytic polishing.

Optionally, the gas turbine system further includes a waste heat boiler, a steam turbine, a condenser, a heat supply network heater and a primary drainage cooler, wherein:

the steam outlet end of the gas turbine is communicated with the steam inlet end of the waste heat boiler; the steam outlet end of the waste heat boiler is communicated with the steam inlet end of the steam turbine; the steam outlet end of the steam turbine is communicated with the steam inlet end of the heat supply network heater; the steam outlet end of the heat supply network heater is communicated with the water inlet end of the primary drainage cooler; the water outlet end of the primary hydrophobic cooler is communicated with the water inlet end of the secondary hydrophobic cooler; the steam exhaust end of the steam turbine is communicated with the steam inlet end of the condenser; the water discharging end of the condenser is communicated with the water inlet end of the waste heat boiler; the condenser is communicated with the cooling tower.

Optionally, the gas turbine system further comprises a second pump body, a water inlet end of the second pump body is communicated with a water outlet end of the condenser, and a water outlet end of the second pump body is communicated with a water inlet end of the waste heat boiler.

Further optionally, the first pump body and the second pump body are both booster pumps.

Further optionally, the combustion engine system further comprises a first generator, and the steam turbine is coaxially connected with the first generator and drives the first generator to generate electricity.

Further optionally, the gas turbine system further comprises a second generator, and the compressor is coaxially connected with the second generator and drives the second generator to generate power.

Optionally, the air heat exchanger is a plate air heat exchanger.

Optionally, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve, and the eleventh valve are stop valves.

The beneficial effects of the embodiment of the specification are as follows:

when the heat value of the natural gas rises, nitrogen is added into a natural gas system to maintain the stability of the heat value of the natural gas, the stable operation of the gas turbine is ensured, the problems that components of the upstream natural gas frequently change and a manufacturer cannot frequently perform combustion adjustment on a combustion engine in the prior art are solved, the heat value of the natural gas is monitored in real time, the nitrogen adding amount of the natural gas system is controlled according to the change of the heat value of the natural gas, the automatic adjustment when the heat value of the natural gas rises can be realized, the heat value of the natural gas is stabilized within a certain range, the combustion stability of the gas turbine is ensured, the stable operation of the gas turbine is further ensured, the service life of the gas turbine is prolonged, and the economic loss of a power plant is reduced.

In addition, the air inlet temperature of the gas turbine is adjusted by arranging the air heat exchanger at the inlet of the gas compressor of the gas turbine, and the switching of cold and hot media is controlled by a plurality of valves, so that the purpose of increasing or reducing the air inlet temperature of the gas turbine according to the actual operation condition is realized, and different requirements of the unit under different operation conditions are met. Under the working condition of high environmental temperature and large load in summer, cold medium is introduced into the air heat exchanger to cool air at the air inlet of the gas turbine, so that the air inlet temperature of the gas turbine is reduced, the output of the gas turbine in summer is kept, the peak operation in summer is realized, and the load capacity of the gas turbine power plant is improved. Under the condition of partial load, a heat medium is introduced into the air heat exchanger to heat air at the air inlet of the gas turbine, so that the air inlet temperature of the gas turbine is increased, the front temperature of the gas turbine is increased, and the efficiency of the unit is improved.

The innovation points of the embodiment of the specification comprise:

1. in this embodiment, when the calorific value of the natural gas is increased, nitrogen is added to the natural gas system to maintain the stability of the calorific value of the natural gas, so as to ensure the stable operation of the gas turbine, and the problem that in the prior art, components of the upstream natural gas frequently change, and a manufacturer cannot frequently perform combustion adjustment on a combustion engine is solved.

2. In this embodiment, the natural gas calorific value is monitored in real time, and the nitrogen addition amount of the natural gas system is controlled according to the change of the natural gas calorific value, so that automatic adjustment when the natural gas calorific value rises can be realized, the natural gas calorific value is stabilized within a certain range, the combustion stability of the gas turbine is ensured, the stable operation of the gas turbine is further ensured, the service life of the gas turbine is prolonged, and the economic loss of a power plant is reduced.

3. In the embodiment, the air heat exchanger is arranged at the inlet of the compressor of the gas turbine to adjust the inlet air temperature of the gas turbine, and the switching of the cold and hot media is controlled by the valves, so that the aim of increasing or reducing the inlet air temperature of the gas turbine according to the actual operation condition is fulfilled, different requirements of the unit under different operation conditions are met, and the air heat exchanger is one of innovation points of the embodiment of the specification.

4. In the embodiment, under the working condition of high environmental temperature and large load in summer, the cold medium is introduced into the air heat exchanger to cool the air at the air inlet of the gas turbine, so that the air inlet temperature of the gas turbine is reduced, the output of the gas turbine in summer is kept, the summer peak operation is realized, and the load capacity of the gas turbine power plant is improved.

5. In the embodiment, under the condition of partial load, the heat medium is introduced into the air heat exchanger to heat the air at the air inlet of the combustion engine, so that the air inlet temperature of the combustion engine is increased, the temperature of the combustion engine before the turbine is increased, and the unit efficiency is improved.

6. In the embodiment, the cold water of the air conditioner generated by the air conditioner of the power plant is used as the cold medium source of the air heat exchanger, and on the basis of not increasing additional investment, the air inlet temperature of the combustion engine is reduced by using the existing refrigeration system, so that the purpose of increasing the output of the combustion engine is achieved, and the cold water cooling system is one of the innovation points of the embodiment of the specification.

7. In the embodiment, the secondary drainage of the heat supply network of the low-grade heat source is used as a heat medium source of the air heat exchanger, so that the problem of poor economic benefit caused by the fact that a high-grade heat source is adopted in an air exhaust mode of the compressor in the prior art is solved, the cold source loss of the unit and the recovery temperature of the working medium are reduced, the air inlet temperature of the gas turbine is increased, the unit efficiency is further improved, and the method is one of the innovation points of the embodiment of the specification.

8. In the embodiment, the closed cold water backwater is used as a heat medium source of the air heat exchanger, and a low-grade heat source is adopted, so that the problem of poor economic benefit caused by the fact that a high-grade heat source is adopted in an air exhaust mode of the compressor in the prior art is solved, the inlet air temperature of the gas turbine can be increased, the cold source loss is reduced, the purpose of improving the unit efficiency is achieved, and the closed cold water backwater air conditioner is one of the innovation points of the embodiment of the specification.

Drawings

In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of a gas turbine system capable of adjusting the heating value of natural gas provided by an embodiment of the present disclosure;

in the figure, 1 is a gas turbine, 2 is a gas filter, 3 is a gas compressor, 4 is a cooling tower, 5 is a closed cold water heat exchanger, 6 is a closed cold water return pipe, 7 is a closed cold water supply pipe, 8 is a two-stage hydrophobic cooler, 9 is a first valve, 10 is a second valve, 11 is a natural gas conveying pipeline, 12 is a nitrogen conveying pipeline, 13 is a nitrogen charging regulating valve, 14 is a sampling pipe, 15 is a heat value instrument, 16 is a control device, 17 is an air heat exchanger, 18 is a heat exchange water inlet pipeline, 19 is a third valve, 20 is a heat exchange water outlet pipeline, 21 is a fourth valve, 22 is a first pump body, 23 is a cooling water inlet pipe, 24 is a fifth valve, 25 is a cooling water outlet pipe, 26 is a sixth valve, 27 is a first heating water inlet pipe, 28 is a seventh valve, 29 is a first heating water outlet pipe, 30 is an eighth valve, 31 is a second heating water inlet pipe, 32 is a ninth valve, 33 is a second heating water outlet pipe, 34 is a tenth valve, 35 is a water conduit, 36 is an eleventh valve, 37 is a waste heat boiler, 38 is a steam turbine, 39 is a condenser, 40 is a heat network heater, 41 is a primary drainage cooler, 42 is a second pump body, 43 is a first generator, 44 is a second generator, and 45 is a lithium bromide device.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The embodiment of the specification discloses a gas turbine system capable of adjusting the heat value of natural gas. The following are detailed below. Fig. 1 is a schematic diagram illustrating a gas turbine system capable of adjusting the heating value of natural gas, which includes a combustion engine system, a natural gas heating value adjusting system, and a combustion engine inlet temperature control system, as shown in fig. 1, according to an embodiment of the present disclosure.

The gas turbine system comprises a gas turbine 1, a gas filter 2, a gas compressor 3, a cooling tower 4, a closed cold water heat exchanger 5, a closed cold water return pipe 6, a closed cold water supply pipe 7, a secondary drainage cooler 8, a first valve 9 and a second valve 10; the gas compressor 3 is connected with the gas filter 2; the gas filter 2 is communicated with an air inlet of a combustion chamber of the gas turbine 1; the cooling tower 4 is communicated with the closed-loop water heat exchanger 5 and is used for supplying a cooling water source to the closed-loop water heat exchanger 5; the closed cold water return pipe 6 is connected to a water inlet of the closed cold water heat exchanger 5; the first valve 9 is installed on the closed cold water return pipe 6 and used for controlling the circulation of closed cold water return water in the closed cold water return pipe 6; the closed cold water supply pipe 7 is connected with the water outlet of the closed cold water heat exchanger 5; the second valve 10 is installed on the closed cold water supply pipe 7 and is used for controlling the circulation of closed cold water in the closed cold water supply pipe 7; the water inlet end of the secondary hydrophobic cooler 8 is communicated with the closed cold water supply pipe 7, and the water outlet end of the secondary hydrophobic cooler 8 is communicated with the closed cold water return pipe 6.

In a specific embodiment, the gas turbine system further comprises a waste heat boiler 37, a steam turbine 38, a condenser 39, a heat supply network heater 40 and a primary drainage cooler 41, wherein the steam outlet end of the gas turbine 1 is communicated with the steam inlet end of the waste heat boiler 37; the steam outlet end of the waste heat boiler 37 is communicated with the steam inlet end of the steam turbine 38; the steam outlet end of the steam turbine 38 is communicated with the steam inlet end of the heat supply network heater 40; the steam outlet end of the heat supply network heater 40 is communicated with the water inlet end of the primary drainage cooler 41; the water outlet end of the primary hydrophobic cooler 41 is communicated with the water inlet end of the secondary hydrophobic cooler 8; the exhaust end of the steam turbine 38 is communicated with the steam inlet end of the condenser 39; the water discharging end of the condenser 39 is communicated with the water inlet end of the waste heat boiler 37; the condenser 39 is in communication with the cooling tower 4.

Air enters from an air compressor air inlet of the gas turbine 1, is compressed in the air compressor, then flows to a combustion chamber of the gas turbine 1, is mixed with natural gas fuel which sequentially enters the combustion chamber through the gas compressor 3 and the gas filter 2 and then is combusted to form high-temperature gas, then flows into a turbine of the gas turbine 1 to expand and do work, after the work is done, the high-temperature gas still having high energy is conveyed into a waste heat boiler 37, water is heated in the waste heat boiler 37 to form steam, and the generated steam flows into a steam turbine 38 from a steam outlet end of the waste heat boiler 37 to push the steam turbine 38 to work. The gas discharged from the steam discharge end of the steam turbine 38 enters the condenser 39 to be cooled to form condensed water, and then the condensed water is discharged from the water discharge end of the condenser 39 and is conveyed to the water inlet end of the waste heat boiler 37 to be used as a water source required by the waste heat boiler 37.

Further, the combustion engine system further comprises a second pump body 42, a water inlet end of the second pump body 42 is communicated with a water outlet end of the condenser 39, and a water outlet end of the second pump body 42 is communicated with a water inlet end of the exhaust-heat boiler 37. Preferably, the second pump 42 is a booster pump. The condensate water that forms in condenser 39 is carried out the pressure boost by the second pump body 42, then is carried to exhaust-heat boiler 37 in, and the smooth transport of condensate water has been guaranteed in setting up of the second pump body 42, has improved the stability of system.

The cooling tower 4 is respectively communicated with the closed water heat exchanger 5 and the condenser 39, and is used for providing a cooling water source for the closed water heat exchanger 5 and the condenser 39, cooling the exhaust steam of the steam turbine 38 in the condenser 39 to form condensed water, cooling closed water return water in the closed water heat exchanger 5, re-conveying the cooled closed water to a closed water circulation system for circulation, and exchanging heat between the cooling water carrying waste heat and air in the tower by the cooling tower 4, so that the waste heat is transmitted to the air and is dissipated into the atmosphere.

In the embodiment of the present invention, the gas turbine system adopts a multi-shaft arrangement, the gas turbine system further includes a first generator 43 and a second generator 44, the steam turbine 38 is coaxially connected to the first generator 43, and the steam delivered from the waste heat boiler 37 to the steam turbine 38 pushes the steam turbine 38 to do work, so as to drive the first generator 43 to generate electricity; the gas compressor is coaxially connected with the second generator 44, high-temperature gas enters a turbine of the gas turbine 1 to perform expansion work, the turbine impeller is pushed to drive the gas compressor impeller to rotate together, and the second generator 44 is coaxial with the gas compressor of the gas turbine 1 to further drive the second generator 44 to generate electricity.

It should be noted and understood that the present embodiment only illustrates a multi-shaft arrangement of the gas turbine assembly, but the present gas turbine system is not limited to the multi-shaft arrangement, and the present gas turbine system can be applied to a single-shaft arrangement according to the requirement.

The natural gas calorific value adjusting system comprises a natural gas conveying pipeline 11, a nitrogen conveying pipeline 12, a nitrogen charging regulating valve 13, a sampling pipe 14, a calorific value instrument 15 and a control device 16; the natural gas conveying pipeline 11 is connected to the gas inlet end of the gas compressor 3 and is used for conveying natural gas to the gas compressor 3; one end of the nitrogen conveying pipeline 12 is communicated with a nitrogen source, and the other end of the nitrogen conveying pipeline is communicated with the natural gas conveying pipeline 11 and is used for filling nitrogen into the natural gas conveying pipeline 11 so that the natural gas in the natural gas conveying pipeline 11 is mixed with the filled nitrogen; the nitrogen charging regulating valve 13 is arranged on the nitrogen conveying pipeline 12 and is used for controlling the amount of nitrogen charged into the natural gas conveying pipeline 11; a sampling pipe 14 is led out from the natural gas conveying pipeline 11 between the nitrogen conveying pipeline 12 and the fuel gas compressor 3; the heat value instrument 15 is arranged on the sampling pipe 14 and is used for monitoring the heat value of the natural gas after the nitrogen is added into the sampling pipe 14; the signal output end of the heat value instrument 15 is electrically connected with the control device 16, and the control end of the nitrogen charging regulating gate 13 is electrically connected with the control device 16.

The heat value meter 15 monitors the heat value of the natural gas in the natural gas conveying pipeline 11 in real time through the sampling pipe 14, the measured heat value of the natural gas is communicated to the control device 16, the control device 16 compares the received heat value of the natural gas with a preset heat value threshold value of the natural gas and obtains a comparison result, when the heat value of the received natural gas is larger than the heat value threshold value of the natural gas, the control device 16 generates a natural gas heat value regulating and controlling instruction according to the comparison result and sends the natural gas heat value regulating and controlling instruction to the control end of the nitrogen charging regulating valve 13, and the nitrogen charging regulating valve 13 regulates the opening of the valve according to the natural gas heat value regulating and controlling instruction so as to control the nitrogen charging amount of the natural gas in the natural gas conveying pipeline 11 and further regulate the heat value of the natural gas.

The natural gas heat value adjusting system mainly aims at the situation that the heat value of natural gas is increased, in the operation process of the gas turbine 1, if the heat value of the natural gas in the natural gas system is gradually increased, the natural gas system is doped with additive gas to reduce the heat value of the natural gas, and nitrogen with stable and mild properties is adopted as the additive gas of the natural gas, so that the natural gas cannot expand in volume due to heating, has small deformation amplitude and is safer. The natural gas calorific value of the gas turbine 1 is adjusted by adding nitrogen into the natural gas system, so that the natural gas calorific value is controlled within a certain range, the stability of the natural gas calorific value is maintained, and the stable operation of the gas turbine 1 is further ensured.

The natural gas system conveys natural gas to the combustion engine system through a natural gas conveying pipeline 11, and a nitrogen conveying pipeline 12 and a sampling pipe 14 are led out from the natural gas conveying pipeline 11 in sequence along the natural gas conveying flowing direction. On one hand, nitrogen is added into the natural gas conveying pipeline 11 by using the nitrogen conveying pipeline 12, and the nitrogen adding amount of the natural gas heat value adjusting system is controlled by a nitrogen filling adjusting door 13 on the nitrogen conveying pipeline 12. On the other hand, the sampling pipe 14 is used for sampling the natural gas after nitrogen addition, the sampling pipe 14 is provided with a heat value instrument 15, the heat value instrument 15 is used for measuring the heat value of the natural gas of the sample, meanwhile, the measured heat value of the natural gas is communicated to the control device 16 in real time, the control device 16 is used for carrying out data analysis on the received heat value of the natural gas and comparing the data analysis with a preset heat value threshold value of the natural gas to obtain a comparison result, when the natural gas is monitored to be gradually increased and exceed the heat value threshold value of the natural gas, the control device 16 calculates the valve opening size of the nitrogen charging regulating valve 13 according to the comparison result of the currently received heat value of the natural gas and the heat value threshold value of the natural gas, namely the difference value between the currently received heat value of the natural gas and the heat value threshold value of the natural gas, the natural gas heat value regulating instruction is generated by the control device and communicated to the control end of the nitrogen charging regulating valve 13, the control end regulates the valve opening size of the nitrogen charging valve 13 according to the heat value regulating instruction of the natural gas, so as to increase the nitrogen adding amount in the natural gas conveying pipeline 11 and realize the automatic adjustment of the natural gas heat value, thereby maintaining the stability of the natural gas heat value and ensuring the stable operation of the gas turbine 1. In the process, the natural gas calorific value threshold preset by the system can be adjusted according to the actual operation condition of the gas turbine 1, so that the fuel-air ratio set by the combustion chamber of the gas turbine 1 can meet the combustion under the current natural gas calorific value, and the stable combustion of the gas turbine 1 is ensured.

Because the natural gas has explosion risk, the nitrogen-filled regulating valve 13 is preferably a pneumatic regulating valve, the nitrogen amount conveyed into the natural gas conveying pipeline 11 by the nitrogen conveying pipeline 12 is automatically and accurately controlled by utilizing the nitrogen-filled regulating valve 13, the automatic adjustment of the heat value of the natural gas is realized, and the change of the heat value of the natural gas is responded in time. Furthermore, nitrogen gas pipeline 12, the material of sampling tube 14 are the nonrust steel pipe of low carbon, and steel pipe inner wall electrolytic polishing chooses the material of the nonrust steel pipe of low carbon for use, and is corrosion-resistant, and this kind of material roughness is low, is difficult to form the micro vortex and takes away the pollution particle, makes granule carry possibility greatly reduced, not only can avoid solid impurity sneak into in the natural gas and block up the problem of 1 natural gas filter screen of gas turbine, still can avoid solid impurity to cause the problem that sampling tube 14 blockked up, calorific value appearance 15 trouble.

The output of the gas turbine 1, which is a positive displacement power machine, is related to the mass flow of the inlet air, and when the inlet air temperature decreases, the density of the air increases and the mass flow of the inlet air increases, and the output and efficiency of the combustion engine also increase, so that it can be concluded that: in a "cold" environment, the gas turbine 1 will have a greater output, so the engine output can be increased in a high temperature environment by reducing the inlet air temperature. Under partial load, if the air inlet temperature is increased under the condition of constant load, the temperature before the turbine is increased (if the temperature control is not carried out), so that the efficiency of the gas turbine is improved, when the gas turbine runs under the partial load, the air inlet mass flow of the air compressor is a constant value, the air inlet temperature of the gas turbine is increased, the air inlet density is reduced, the air inlet volume flow is increased, the IGV angle of the air compressor is forced to be enlarged, the throttling loss of air flowing in the IGV is reduced, the running condition of the air compressor is improved, and the purposes of saving energy and improving the efficiency are achieved. Therefore, the requirement of the internal combustion engine on the intake air temperature is different under different running conditions, the output of the internal combustion engine needs to be improved by reducing the intake air temperature of the internal combustion engine under a high-temperature and large-load condition, and the efficiency of the internal combustion engine needs to be improved by increasing the intake air temperature of the internal combustion engine under a partial-load condition.

In order to achieve the above purpose, the intake temperature control system of the combustion engine comprises an air heat exchanger 17, a heat exchange water inlet pipeline 18, a third valve 19, a heat exchange water outlet pipeline 20, a fourth valve 21, a first pump body 22, a cooling water inlet pipe 23, a fifth valve 24, a cooling water outlet pipe 25, a sixth valve 26, a first heating water inlet pipe 27, a seventh valve 28, a first heating water outlet pipe 29, an eighth valve 30, a second heating water inlet pipe 31, a ninth valve 32, a second heating water outlet pipe 33, a tenth valve 34, a water conduit 35, an eleventh valve 36 and a lithium bromide device 45; the air outlet of the air heat exchanger 17 is communicated with the air inlet of the compressor of the gas turbine 1; the heat exchange water inlet pipeline 18 is connected to the water inlet end of the air heat exchanger 17; the third valve 19 is installed on the heat exchange water inlet pipeline 18 and is used for controlling the water inlet amount of the air heat exchanger 17; the heat exchange water outlet pipeline 20 is connected to the water outlet end of the air heat exchanger 17; the fourth valve 21 is installed on the heat exchange water outlet pipeline 20 and is used for controlling the water yield of the air heat exchanger 17; the first pump body 22 is installed on the heat exchange water outlet pipe 20 between the air heat exchanger 17 and the fourth valve 21; one end of the cooling water inlet pipe 23 is communicated with the water outlet of the lithium bromide device 45, and the other end of the cooling water inlet pipe is communicated with the heat exchange water inlet pipeline 18, and is used for conveying air conditioner cold water to the air heat exchanger 17 through the heat exchange water inlet pipeline 18; the fifth valve 24 is installed on the cooling water inlet pipe 23 and is used for controlling the circulation of the air-conditioning cold water in the cooling water inlet pipe 23; one end of the cooling water outlet pipe 25 is communicated with a water inlet of the lithium bromide device 45, and the other end of the cooling water outlet pipe is communicated with the heat exchange water outlet pipeline 20, and is used for conveying the air conditioner cold water after heat exchange back to the lithium bromide device 45; the sixth valve 26 is mounted on the cooling water outlet pipe 25 and is used for controlling the water flow in the cooling water outlet pipe 25; one end of the first heating water inlet pipe 27 is communicated with the heat exchange water inlet pipe 18, and the other end of the first heating water inlet pipe is communicated with the closed cold water return pipe 6 between the first valve 9 and the secondary drainage cooler 8, and is used for conveying closed cold water return water to the air heat exchanger 17 through the heat exchange water inlet pipe 18; the seventh valve 28 is installed on the first heating water inlet pipe 27 and is used for controlling the delivery amount of the closed cold water return water in the first heating water inlet pipe 27; one end of the first heating water outlet pipe 29 is communicated with the heat exchange water outlet pipeline 20, and the other end of the first heating water outlet pipe is communicated with the closed cold water supply pipe 7 between the second valve 10 and the second-stage hydrophobic cooler 8, so as to convey the heat-exchanged closed cold water return water into the closed cold water supply pipe 7; the eighth valve 30 is installed on the first heating water outlet pipe 29 and is used for controlling the water flow rate in the first heating water outlet pipe 29; one end of the second heating water inlet pipe 31 is communicated with the heat exchange water inlet pipe 18, and the other end is communicated with the water outlet of the secondary drainage cooler 8, and is used for conveying a heating water source to the air heat exchanger 17 through the heat exchange water inlet pipe 18; the ninth valve 32 is installed on the second heating water inlet pipe 31 and is used for controlling the flow rate of the heating water source in the second heating water inlet pipe 31; one end of the second heating water outlet pipe 33 is communicated with the heat exchange water outlet pipeline 20, and the other end is communicated with the water inlet of the secondary hydrophobic cooler 8, and is used for conveying a heating water source after heat exchange to the secondary hydrophobic cooler 8; the tenth valve 34 is installed on the second heating water outlet pipe 33 and is used for controlling the water flow rate in the second heating water outlet pipe 33; the water conduit 35 is connected to the second heating water outlet pipe 33 between the heat exchange water outlet pipeline 20 and the tenth valve 34, and is used for conveying medium water to the secondary hydrophobic cooler 8 through the second heating water outlet pipe 33; the eleventh valve 36 is installed on the penstock 35 for controlling the flow rate of the mediating water in the penstock 35.

According to the embodiment of the invention, the air heat exchanger 17 is arranged at the air inlet of the compressor of the gas turbine 1, and the switching of the cooling and heating media of the air heat exchanger 17 is controlled by a plurality of valves of a first valve 9, a second valve 10, a third valve 19, a fourth valve 21, a fifth valve 24, a sixth valve 26, a seventh valve 28, an eighth valve 30, a ninth valve 32, a tenth valve 34 and an eleventh valve 36, so that different requirements of the unit under actual operation conditions are met. In detail, the heat exchange water inlet pipe 18 serves as a main water inlet pipe of the air heat exchanger 17 and is used for conveying a heat exchange medium into the air heat exchanger 17, the third valve 19 is used for connecting or blocking water circulation in the heat exchange water inlet pipe 18, the heat exchange water outlet pipe 20 serves as a main water outlet pipe of the air heat exchanger 17 and is used for conveying the heat exchange medium after heat exchange in the air heat exchanger 17 to the outside of the air heat exchanger 17, and the fourth valve 21 is used for connecting or blocking water circulation in the heat exchange water outlet pipe 20. The cooling water inlet pipe 23 and the cooling water outlet pipe 25 are cold medium conveying pipelines of the air heat exchanger 17, and the fifth valve 24 and the sixth valve 26 respectively control the circulation of the cold medium in the cooling water inlet pipe 23 and the cooling water outlet pipe 25, the first heating water inlet pipe 27 and the first heating water outlet pipe 29 are the conveying pipelines of the air heat exchanger 17 for closing the source of the cold water and the hot medium, and the first valve 9, the second valve 10, the seventh valve 28 and the eighth valve 30 are used for blocking or connecting the air heat exchanger 17 to stop the transmission of a cold water return heat source, in addition, the second heating water inlet pipe 31 and the second heating water outlet pipe 33 are used as a transmission pipeline of a secondary drainage heat source of a heat supply network of the air heat exchanger 17, the water conduit 35 is used for inputting medium water into the air inlet temperature control system of the combustion engine, the heat exchange of the heat supply network secondary hydrophobic heat source is completed through the intermediary water, and the transmission of the intermediary water of the heat supply network secondary hydrophobic heat medium of the air heat exchanger 17 is blocked or communicated through a ninth valve 32, a tenth valve 34 and an eleventh valve 36.

The cold water of the air conditioner is used as a cold medium source of the air heat exchanger 17, so that the air inlet temperature of the compressor of the gas turbine 1 can be reduced to achieve the purpose of recovering the output of the gas turbine, and the additional investment cost is reduced by utilizing the existing refrigeration system. Meanwhile, in the embodiment, the closed cold water return water and the second-level drainage of the heat supply network are used as the heat medium source of the air heat exchanger 17, and the low-grade heat source is used, so that the problem of poor economic benefit caused by the adoption of a high-grade heat source in the air exhaust mode of the compressor in the prior art is solved, the cold source loss of the unit is reduced, the air inlet temperature of the gas turbine 1 is increased, and the purpose of improving the efficiency of the unit is achieved.

The specific control process of the gas turbine inlet temperature control system provided by the embodiment of the invention is as follows:

when the air heat exchanger 17 is not in operation, the third valve 19, the fourth valve 21, the fifth valve 24, the sixth valve 26, the seventh valve 28, the eighth valve 30, the ninth valve 32, the tenth valve 34, and the eleventh valve 36 are closed, and the first valve 9 and the second valve 10 are opened; closed cold water flows out of the closed cold water heat exchanger 5, flows into the secondary hydrophobic cooler 8 through the closed cold water supply pipe 7, cools the secondary hydrophobic of a heat supply network in the secondary hydrophobic cooler 8, and closed cold water return water is conveyed back to the closed cold water heat exchanger 5 through the closed cold water return pipe 6;

when the air heat exchanger 17 is operated to reduce the compressor inlet air temperature of the gas turbine 1, the seventh valve 28, the eighth valve 30, the ninth valve 32, the tenth valve 34 and the eleventh valve 36 are closed, and the first valve 9, the second valve 10, the third valve 19, the fourth valve 21, the fifth valve 24 and the sixth valve 26 are opened; the secondary drainage of a heat supply network in the secondary drainage cooler 8 is cooled by the closed cold water flowing out of the closed cold water heat exchanger 5; air-conditioning cold water generated by the lithium bromide device 45 is conveyed into the air heat exchanger 17 through the cooling water inlet pipe 23 and the heat exchange water inlet pipeline 18, air is cooled in the air heat exchanger 17, the cooled air enters the air compressor through an air compressor air inlet of the gas turbine 1, and the air-conditioning cold water after heat exchange sequentially flows through the heat exchange water outlet pipeline 20 and the cooling water outlet pipe 25 under the action of the first pump body 22 and is conveyed back into the lithium bromide device 45;

when the air heat exchanger 17 is put into operation to raise the compressor inlet air temperature of the gas turbine 1, the first valve 9, the second valve 10, the fifth valve 24, the sixth valve 26, the ninth valve 32, the tenth valve 34 and the eleventh valve 36 are closed, and the third valve 19, the fourth valve 21, the seventh valve 28 and the eighth valve 30 are opened; the closed cold water backwater in the closed cold water backwater pipe 6 is sequentially conveyed to the air heat exchanger 17 through the first heating water inlet pipe 27 and the heat exchange water inlet pipeline 18, heat exchange is carried out between the closed cold water backwater and the air in the air heat exchanger 17, the heated air after heat exchange enters the air compressor through an air compressor air inlet of the gas turbine 1, and the cooled closed cold water backwater after heat exchange is conveyed to the closed cold water supply pipe 7 through the heat exchange water outlet pipeline 20 and the first heating water outlet pipe 29 under the action of the first pump body 22; or,

when the air heat exchanger 17 is put into operation to raise the compressor inlet air temperature of the gas turbine 1, the first valve 9, the second valve 10, the fifth valve 24, the sixth valve 26, the seventh valve 28 and the eighth valve 30 are closed, and the third valve 19, the fourth valve 21, the ninth valve 32, the tenth valve 34 and the eleventh valve 36 are opened; the intermediate water is introduced through the water conduit 35 and conveyed to the secondary hydrophobic cooler 8 through the second heating water outlet pipe 33, secondary drainage of a heat supply network is cooled in the secondary hydrophobic cooler 8, the intermediate water heated after heat exchange is conveyed to the air heat exchanger 17 through the second heating water inlet pipe 31 and the heat exchange water inlet pipe 18 in sequence, air is heated in the air heat exchanger 17, the heated air enters the gas turbine 1 through the air compressor air inlet of the gas turbine 1, and the intermediate water cooled after heat exchange is conveyed back to the secondary hydrophobic cooler 8 through the heat exchange water outlet pipe 20 and the second heating water outlet pipe 33 under the action of the first pump body 22 to cool the secondary drainage of the heat supply network in the secondary hydrophobic cooler 8 for circulating heat exchange.

According to the above specific control process, in the embodiment of the present invention, the supply of the cold medium and the hot medium into the air heat exchanger 17 is switched by controlling a plurality of valves, and preferably, the first valve 9, the second valve 10, the third valve 19, the fourth valve 21, the fifth valve 24, the sixth valve 26, the seventh valve 28, the eighth valve 30, the ninth valve 32, the tenth valve 34, and the eleventh valve 36 are all stop valves. Further, the air heat exchanger 17 is a plate type air heat exchanger.

Therefore, the purpose of increasing or reducing the air inlet temperature of the air compressor of the gas turbine 1 according to the actual operation condition is achieved, and different requirements of the unit are met. Under the working condition of high environmental temperature and large load in summer, a cold medium is introduced into the air heat exchanger 17 to cool the air at the air inlet of the compressor of the gas turbine 1, so that the air inlet temperature of the compressor of the gas turbine 1 is reduced, the output of the gas turbine in summer is kept, the peak operation in summer is realized, and the load capacity of the gas turbine power plant is improved. Under the condition of partial load, a heat medium is introduced into the air heat exchanger 17 to heat air at an air inlet of an air compressor of the gas turbine 1, so that the air inlet temperature of the air compressor of the gas turbine 1 is increased, the turbine front temperature of the gas turbine is increased, and the unit efficiency is improved.

To sum up, the specification discloses a gas turbine system capable of adjusting a natural gas heat value, when the natural gas heat value rises, nitrogen is added into the natural gas system to maintain the stability of the natural gas heat value, so as to ensure the stable operation of the gas turbine, solve the problems that components of upstream natural gas frequently change and a manufacturer cannot frequently perform combustion adjustment on a gas turbine in the prior art, monitor the natural gas heat value in real time, control the nitrogen adding amount of the natural gas system according to the change of the natural gas heat value, realize the automatic adjustment when the natural gas heat value rises, stabilize the natural gas heat value within a certain range, ensure the stable combustion of the gas turbine, further ensure the stable operation of the gas turbine, prolong the service life of the gas turbine and reduce the economic loss of a power plant.

Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The gas turbine system capable of adjusting the heat value of the natural gas is characterized by comprising a gas turbine system, a natural gas heat value adjusting system and a gas turbine inlet temperature control system; wherein:

the gas turbine system comprises a gas turbine, a gas filter, a gas compressor, a cooling tower, a closed cold water heat exchanger, a closed cold water return pipe, a closed cold water supply pipe, a secondary drainage cooler, a first valve and a second valve; the gas compressor is connected with the gas filter; the gas filter is communicated with a gas inlet of a combustion chamber of the gas turbine; the cooling tower is communicated with the closed water heat exchanger and is used for supplying a cooling water source to the closed water heat exchanger; the closed cold water return pipe is connected to a water inlet of the closed cold water heat exchanger; the first valve is arranged on the closed cold water return pipe and used for controlling the circulation of closed cold water return water in the closed cold water return pipe; the closed cold water supply pipe is connected with a water outlet of the closed cold water heat exchanger; the second valve is arranged on the closed cold water supply pipe and is used for controlling the circulation of closed cold water in the closed cold water supply pipe; the water inlet end of the secondary drainage cooler is communicated with the cold water supply pipe, and the water outlet end of the secondary drainage cooler is communicated with the cold water return pipe;

the natural gas calorific value adjusting system comprises a natural gas conveying pipeline, a nitrogen filling regulating valve, a sampling pipe, a calorific value instrument and a control device; the natural gas conveying pipeline is connected to the gas inlet end of the gas compressor and used for conveying natural gas to the gas compressor; one end of the nitrogen conveying pipeline is communicated with a nitrogen source, and the other end of the nitrogen conveying pipeline is communicated with the natural gas conveying pipeline and is used for filling nitrogen into the natural gas conveying pipeline so as to mix the natural gas in the natural gas conveying pipeline with the filled nitrogen; the nitrogen charging regulating valve is arranged on the nitrogen conveying pipeline and used for controlling the amount of nitrogen charged into the natural gas conveying pipeline; leading out a path of the sampling pipe on the natural gas conveying pipeline between the nitrogen conveying pipeline and the gas compressor; the heat value instrument is arranged on the sampling pipe and is used for monitoring the heat value of the natural gas after the nitrogen is added into the sampling pipe; the signal output end of the heat value instrument is electrically connected with the control device, and the control end of the nitrogen charging regulating gate is electrically connected with the control device;

the gas turbine inlet air temperature control system comprises an air heat exchanger, a heat exchange water inlet pipeline, a third valve, a heat exchange water outlet pipeline, a fourth valve, a first pump body, a cooling water inlet pipe, a fifth valve, a cooling water outlet pipe, a sixth valve, a first heating water inlet pipe, a seventh valve, a first heating water outlet pipe, an eighth valve, a second heating water inlet pipe, a ninth valve, a second heating water outlet pipe, a tenth valve, a water guide pipe, an eleventh valve and a lithium bromide device; the air outlet of the air heat exchanger is communicated with the air inlet of the compressor of the gas turbine; the heat exchange water inlet pipeline is connected to the water inlet end of the air heat exchanger; the third valve is arranged on the heat exchange water inlet pipeline and is used for controlling the water inlet quantity of the air heat exchanger; the heat exchange water outlet pipeline is connected to the water outlet end of the air heat exchanger; the fourth valve is arranged on the heat exchange water outlet pipeline and used for controlling the water outlet quantity of the air heat exchanger; the first pump body is arranged on the heat exchange water outlet pipeline between the air heat exchanger and the fourth valve; one end of the cooling water inlet pipe is communicated with a water outlet of the lithium bromide device, and the other end of the cooling water inlet pipe is communicated with the heat exchange water inlet pipeline and used for conveying air conditioner cold water to the air heat exchanger through the heat exchange water inlet pipeline; the fifth valve is arranged on the cooling water inlet pipe and used for controlling the circulation of air conditioner cold water in the cooling water inlet pipe; one end of the cooling water outlet pipe is communicated with a water inlet of the lithium bromide device, and the other end of the cooling water outlet pipe is communicated with the heat exchange water outlet pipeline and used for conveying the air conditioner cold water subjected to heat exchange back into the lithium bromide device; the sixth valve is arranged on the cooling water outlet pipe and used for controlling the water flow flux in the cooling water outlet pipe; one end of the first heating water inlet pipe is communicated with the heat exchange water inlet pipeline, and the other end of the first heating water inlet pipe is communicated with the closed cold water return pipe positioned between the first valve and the secondary drainage cooler and used for conveying closed cold water return water to the air heat exchanger through the heat exchange water inlet pipeline; the seventh valve is arranged on the first heating water inlet pipe and used for controlling the delivery quantity of closed cold water return water in the first heating water inlet pipe; one end of the first heating water outlet pipe is communicated with the heat exchange water outlet pipeline, and the other end of the first heating water outlet pipe is communicated with the closed cold water supply pipe positioned between the second valve and the secondary drainage cooler and used for conveying closed cold water return water after heat exchange to the closed cold water supply pipe; the eighth valve is arranged on the first heating water outlet pipe and used for controlling the water flow flux in the first heating water outlet pipe; one end of the second heating water inlet pipe is communicated with the heat exchange water inlet pipeline, and the other end of the second heating water inlet pipe is communicated with the water outlet of the secondary drainage cooler and is used for conveying a heating water source to the air heat exchanger through the heat exchange water inlet pipeline; the ninth valve is arranged on the second heating water inlet pipe and used for controlling the flow of the heating water source in the second heating water inlet pipe; one end of the second heating water outlet pipe is communicated with the heat exchange water outlet pipeline, and the other end of the second heating water outlet pipe is communicated with a water inlet of the secondary drainage cooler and is used for conveying a heating water source after heat exchange into the secondary drainage cooler; the tenth valve is arranged on the second heating water outlet pipe and used for controlling the water flow flux in the second heating water outlet pipe; the water conduit is connected to the second heating water outlet pipe between the heat exchange water outlet pipeline and the tenth valve and is used for conveying medium water to the secondary drainage cooler through the second heating water outlet pipe; the eleventh valve is arranged on the water diversion pipe and used for controlling the flow rate of intermediate water in the water diversion pipe;

2. The adjustable natural gas heating value gas turbine system of claim 1, wherein the nitrogen-filled damper is a pneumatic damper.

3. The gas turbine system capable of adjusting the calorific value of natural gas of claim 1, wherein the nitrogen conveying pipeline and the sampling pipe are both made of low-carbon stainless steel pipes, and the inner walls of the steel pipes are subjected to electrolytic polishing.

4. The gas turbine system capable of adjusting the heating value of natural gas according to claim 1, wherein the gas turbine system further comprises a waste heat boiler, a steam turbine, a condenser, a heat supply network heater and a primary hydrophobic cooler, wherein:

5. The gas turbine system capable of adjusting the natural gas calorific value according to claim 1, further comprising a second pump body, wherein a water inlet end of the second pump body is communicated with a water outlet end of the condenser, and a water outlet end of the second pump body is communicated with a water inlet end of the waste heat boiler.

6. The adjustable natural gas heating value gas turbine system of claim 5, wherein the first and second pumps are booster pumps.

7. The adjustable natural gas heating value gas turbine system of claim 1, further comprising a first generator, wherein the steam turbine is coaxially connected to the first generator and drives the first generator to generate electricity.

8. The adjustable natural gas heating value gas turbine system of claim 1, further comprising a second generator, wherein the compressor is coaxially connected to the second generator and drives the second generator to generate electricity.

9. A gas turbine system in accordance with claim 1, wherein said air heat exchanger is a plate air heat exchanger.

10. The gas turbine system of claim 1, wherein the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve, and the eleventh valve are all stop valves.