CN221780819U - Heating system of combined cycle unit - Google Patents

Abstract

The utility model discloses a heating system of a combined cycle unit, which comprises a heating subsystem of a gas turbine generator unit, wherein the heating subsystem of the gas turbine generator unit comprises a waste heat boiler, a steam-water heat exchanger and a condenser which are sequentially connected in series through pipelines to form a closed loop, a first cold water inlet and a first hot water outlet which are mutually communicated are further arranged on the steam-water heat exchanger, the first cold water inlet and the first hot water outlet are both suitable for being connected into a heating pipe network, and the waste heat boiler is suitable for being communicated with an exhaust port of a turbine of a gas turbine through pipelines. Therefore, the heat in the high-temperature tail gas discharged by the turbine of the combustion engine can heat cold water in the waste heat boiler to form high-temperature steam, the high-temperature steam can heat the cold water in the heat supply pipe network through the steam-water heat exchanger to form hot water, and the hot water flows along the heat supply pipe network to supply heat for users, so that a great deal of waste of heat in the high-temperature tail gas is avoided.

Description

Heating system of combined cycle unit

Technical Field

The utility model relates to the technical field of heating, in particular to a heating system of a combined cycle unit.

Background

In the last few decades, human society has witnessed a tremendous revolution in the energy arts. Since the industrial revolution, traditional fossil fuels such as coal, oil, and natural gas have been the main source of electricity generation. However, these fossil fuels generate large amounts of carbon dioxide and other room gases during combustion, resulting in global warming. According to the international energy agency research report, the global energy related carbon dioxide emissions of 2021 reach 363 billion tons. In addition, the problem of fossil fuel depletion is also increasing, and sustainability of energy supply is becoming a global focus of attention. Therefore, the development of clean and renewable new energy sources is a common goal in countries around the world. With the continuous progress of new energy technologies such as solar energy, wind energy, water energy and the like, the new energy power generation cost is gradually reduced, and the share of the new energy power generation cost in the global power generation market is increased year by year. However, the intermittent and unstable problems of new energy power generation make the gas turbine indispensable in achieving sustainable energy supply.

The gas turbine is high-efficiency and clean power generation equipment and has the advantages of quick start, flexible scheduling, adaptation to various working conditions and the like. In the new energy power generation system, the gas turbine can be used as a reliable regulator to ensure the stable operation of the power grid. According to the predictions of the global wind harnessing, the installed capacity of global wind power generation will reach over 650 Gigawatts (GW) by 2025. In order to achieve this goal, more reliable power generation equipment such as gas turbines are needed as supplements to compensate for the fluctuation of wind power generation and ensure stable operation of the power grid, and correspondingly, the energy of high-temperature tail gas discharged by the gas turbines is also increased, if not utilized, so that great waste is caused.

Therefore, it is necessary to design a heating system to utilize the energy of the high-temperature exhaust gas.

Disclosure of utility model

Therefore, the technical problem to be solved by the utility model is that more gas turbines are required to be configured along with the development of new energy power generation, correspondingly, the discharged high-temperature tail gas is more and more, and great waste is caused if the high-temperature tail gas is not utilized, so that the heating system of the combined cycle unit is provided.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

The utility model provides a combined cycle unit heating system, includes gas turbine generator unit heating subsystem, gas turbine generator unit heating subsystem includes waste heat boiler, steam-water heat exchanger and the condenser that communicates in proper order and form the closed loop through the pipeline, still be equipped with first cold water entry and the first hot water export of mutual intercommunication on the steam-water heat exchanger, first cold water entry with first hot water export all is suitable for the access heating network, waste heat boiler is suitable for the gas vent of the gas turbine in the gas turbine generator unit through pipeline intercommunication.

Further, the steam outlet of the waste heat boiler is connected with a steam turbine through a pipeline, and the steam turbine is suitable for being connected with a steam turbine generator.

Further, a condensed water feed pump is arranged on a pipeline between the condenser and the waste heat boiler.

Further, the waste heat boiler is internally provided with a superheater, an evaporator and an economizer which are sequentially connected.

Further, the system also comprises a high-temperature fused salt heat storage and heating subsystem, wherein the high-temperature fused salt heat storage and heating subsystem and the heating subsystem of the gas turbine generator set are connected in series and connected into the heating pipe network.

Further, the high-temperature molten salt heat storage heating subsystem comprises a molten salt heater, a high-temperature molten salt storage tank, a molten salt-water heat exchanger and a low-temperature molten salt storage tank which are sequentially communicated through pipelines to form a closed loop, a second cold water inlet and a second hot water outlet are further formed in the molten salt-water heat exchanger, and the second cold water inlet and the second hot water outlet are both suitable for being connected into the heating pipe network.

Further, the molten salt heater is an electric heater.

Further, the molten salt heater is powered by valley electricity or surplus electricity generated by new energy.

Further, on the pipeline between the molten salt heater and the high-temperature molten salt storage tank, and on the pipeline between the molten salt-water heat exchanger and the low-temperature molten salt storage tank, a high-temperature molten salt pipeline valve and a low-temperature molten salt pipeline valve are respectively arranged, and/or, on the upstream pipeline of the steam-water heat exchanger, a heating steam valve is arranged, and is suitable for controlling the on-off of steam, and/or, on the pipeline between the high-temperature molten salt storage tank and the molten salt-water heat exchanger, and on the pipeline between the low-temperature molten salt storage tank and the molten salt heater, a high-temperature molten salt pump and a low-temperature molten salt pump are respectively arranged, and/or, the hot water end of the heating pipe network is provided with a hot water supply valve, and the cold water end of the heating pipe network is provided with a cold water supply pump.

Furthermore, the heating system of the combined cycle unit is matched with a new energy power generation system for use.

The technical scheme of the utility model has the following advantages:

1. The utility model provides a heating system of a combined cycle unit, which comprises a heating subsystem of a gas turbine generator unit, wherein the heating subsystem of the gas turbine generator unit comprises a waste heat boiler, a steam-water heat exchanger and a condenser which are sequentially communicated through pipelines to form a closed loop, a first cold water inlet and a first hot water outlet which are mutually communicated are also arranged on the steam-water heat exchanger, the first cold water inlet and the first hot water outlet are both suitable for being connected with a heating pipe network, the waste heat boiler is suitable for being communicated with an exhaust port of a gas turbine in the gas turbine generator unit through the pipelines, so that heat in high-temperature tail gas exhausted by the gas turbine can heat cold water in the waste heat boiler to form high-temperature steam, the high-temperature steam can heat the cold water in the heating pipe network through the steam-water heat exchanger to form hot water, and the hot water flows along the heating pipe network to supply heat for users, and a great deal of heat waste in the high-temperature tail gas is avoided.

2. According to the heating system of the combined cycle unit, the steam outlet of the waste heat boiler is connected with the steam turbine through the pipeline, and the steam turbine is suitable for being connected with the steam turbine generator, so that high-temperature steam can be used for generating electricity besides supplying heat for users, and when a heating pipe network does not need more steam for supplying heat, the steam turbine can be driven to rotate by the steam, the steam turbine generator is driven to generate electricity, and the supply of electric power is increased.

3. According to the heating system of the combined cycle unit, the molten salt heater is the electric heater, the molten salt heater is powered by valley electricity or the residual electricity generated by new energy, and because the valley electricity is low in cost, the valley electricity is utilized to heat the low-temperature molten salt through the molten salt heater to become high-temperature molten salt, and then the heat is stored in the high-temperature molten salt, so that the heating cost can be reduced, or the residual electricity generated by the new energy is utilized to power, excessive electric energy generated by the new energy can be consumed, and the transmission cost of the new energy is reduced.

4. The heating system of the combined cycle unit provided by the utility model further comprises a high-temperature molten salt heat storage heating subsystem, and the high-temperature molten salt heat storage heating subsystem and the heating subsystem of the gas turbine generator unit are connected in series to the heating pipe network, so that the laying cost of the heating pipe network can be saved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a high temperature molten salt heat storage and heating subsystem according to the present utility model;

FIG. 2 is a schematic diagram of a heating subsystem of a gas turbine generator set in accordance with the present utility model;

Fig. 3 is a schematic structural diagram of a heating system of a combined cycle unit according to the present utility model.

Reference numerals illustrate:

1. An external power supply; 2. a power distribution cabinet; 3. a molten salt heater; 4. a high temperature molten salt pipeline valve; 5. a high temperature molten salt storage tank; 6. a high temperature molten salt pump; 7. a molten salt-water heat exchanger; 8. a low temperature molten salt pipeline valve; 9. a low temperature molten salt storage tank; 10. a low temperature molten salt pump; 11. a hot water supply valve; 12. warming the user; 13. a cold water supply pump; 14. a combustion engine generator; 15. a gas compressor of a gas turbine; 16. a combustion chamber of a combustion engine; 17. a gas turbine; 18. a superheater; 19. an evaporator; 20. an economizer; 21. a waste heat boiler; 22. a heating steam valve; 23. a steam turbine; 24. a steam turbine generator; 25. a condenser; 26. circulating cooling water; 27. a condensed water feed pump; 28. a steam-water heat exchanger; a. a first cold water inlet; b. a first hot water outlet; c. a heating pipe network; d. a second cold water inlet; e. and a second hot water outlet.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

As shown in fig. 1 to 3, the present embodiment provides a combined cycle unit heating system for heating a user 12 using heat, which includes a gas turbine generator unit heating subsystem, a high-temperature molten salt heat storage heating subsystem, and a heating pipe network c. The high-temperature molten salt heat storage and heating subsystem and the gas turbine generator set heating subsystem are connected in series to the heating pipe network c, so that one set of heating pipe network c can be shared, and the laying cost of the heating pipe network c is further saved.

The hot water end of the heating pipe network c is provided with a hot water supply valve 11, and the cold water end of the heating pipe network c is provided with a cold water supply pump 13. The gas turbine generator set comprises a gas turbine compressor 15, a gas turbine combustion chamber 16, a gas turbine 17 and a gas turbine generator 14 which are connected in sequence.

The heating subsystem of the gas turbine generator set comprises a waste heat boiler 21, a steam-water heat exchanger 28 and a condenser 25 which are sequentially communicated through pipelines and form a closed loop.

The air inlet of the waste heat boiler 21 is communicated with the air outlet of the gas turbine 17 through a pipeline. The waste heat boiler 21 is internally provided with a superheater 18, an evaporator 19 and an economizer 20 which are connected in sequence. The steam outlet of the waste heat boiler 21 is connected with the steam turbine 23 through a pipeline, and the steam turbine 23 is connected with the steam turbine generator 24, so that when the heat supply pipe network c does not need more steam for heat supply, the steam can be used for pushing the steam turbine 23 to rotate so as to drive the steam turbine generator 24 to generate electricity, and the power supply is increased. A condensed water feed pump 27 is arranged on a pipeline between the condenser 25 and the waste heat boiler 21. The steam outlet of the waste heat boiler 21 is also communicated with a steam-water heat exchanger 28 through a pipeline, and the steam-water heat exchanger 28 is also provided with a first cold water inlet a and a first hot water outlet b which are mutually communicated. The first cold water inlet a and the first hot water outlet b are both connected to the heat supply pipe network c. A heating steam valve 22 is provided on the upstream line of the steam-water heat exchanger 28 to control the on-off of heating steam.

For the gas turbine generator set heating subsystem, since the temperature of the high temperature exhaust gas discharged from the gas turbine 17 reaches 600 ℃ or higher, since the high-temperature exhaust gas in this temperature state has a large value, the exhaust-heat boiler 21 is disposed downstream of the gas turbine 17. Specifically, the water in the condenser 25 is pumped into the economizer 20 by the condensed water feed pump 27, heated by the high-temperature tail gas, then enters the evaporator 19 to be converted into a steam state, and then enters the superheater 18 to be further heated, so as to form high-temperature steam, and the high-temperature steam is divided into two paths: one path of high-temperature steam enters the steam turbine 23 to push the steam turbine 23 to do rotary work and drive the steam turbine generator 24 to generate power, and the water vapor after doing work enters the condenser 25 to be cooled by the circulating cooling water 26 to form condensed water; when the heating steam valve 22 is opened, the other path of steam enters the steam-water heat exchanger 28 along the pipeline to heat the cold water in the heating pipe network c into hot water, and the steam after releasing heat also enters the condenser 25 to be cooled by the circulating cooling water 26 to form condensed water. The two condensed water parts are pumped by a condensed water feed pump 27 to enter the waste heat boiler 21 for heating, and are circulated.

The high-temperature molten salt heat storage and heating subsystem comprises a molten salt heater 3, a high-temperature molten salt storage tank 5, a molten salt-water heat exchanger 7 and a low-temperature molten salt storage tank 9 which are sequentially communicated through pipelines and form a closed loop. The molten salt heater 3 is an electric heater, the external power source 1 supplies power, the external power source 1 is usually valley electricity, and because the valley electricity cost is low, the Gu Diantong is utilized to heat the low-temperature molten salt through the molten salt heater 3 to become high-temperature molten salt, and then the heat is stored in the high-temperature molten salt, so that the heating cost can be reduced. Of course, the surplus electricity generated by the new energy source can be used for supplying power, so that excessive electric energy generated by the new energy source can be consumed, and the transmission cost of the new energy source can be reduced. The molten salt-water heat exchanger 7 is also provided with a second cold water inlet d and a second hot water outlet e. The second cold water inlet d and the second hot water outlet e are both connected to the heat supply pipe network c. A high-temperature molten salt pipeline valve 4 and a low-temperature molten salt pipeline valve 8 are respectively arranged on a pipeline between the molten salt heater 3 and the high-temperature molten salt storage tank 5 and a pipeline between the molten salt-water heat exchanger 7 and the low-temperature molten salt storage tank 9. A high-temperature molten salt pump 6 and a low-temperature molten salt pump 10 are respectively arranged on a pipeline between the high-temperature molten salt storage tank 5 and the molten salt-water heat exchanger 7 and a pipeline between the low-temperature molten salt storage tank 9 and the molten salt heater 3.

For the high-temperature molten salt heat storage heating subsystem, when the electricity price is in a valley state, the high-temperature molten salt pipeline valve 4 and the low-temperature molten salt pump 10 are opened, the external power supply 1 transmits electric energy to the power distribution cabinet 2 for voltage conversion and adjustment, the converted electric energy provides electric energy for the molten salt heater 3, the low-temperature molten salt pump 10 pumps out the low-temperature molten salt in the low-temperature molten salt storage tank 9, the low-temperature molten salt is conveyed to the molten salt heater 3 along a pipeline to be heated into high-temperature molten salt, and the high-temperature molten salt is conveyed to the high-temperature molten salt storage tank 5 along the pipeline to be stored. After a user generates a heating demand, the high-temperature molten salt pump 6 and the low-temperature molten salt pipeline valve 8 are opened, and the high-temperature molten salt pump 6 pumps out high-temperature molten salt from the high-temperature molten salt storage tank 5 and enters the molten salt-water heat exchanger 7 along the pipeline to heat cold water in the heating pipeline network c to become hot water. The high-temperature molten salt releases heat in the molten salt-water heat exchanger 7 to be converted into low-temperature molten salt, the low-temperature molten salt is conveyed into the low-temperature molten salt storage tank 9 along a pipeline, and when the external power supply 1 enters a valley state again, the low-temperature molten salt pump 10 pumps the low-temperature molten salt in the low-temperature molten salt storage tank 9 into the molten salt heater 3 for reheating.

When heating, the high-temperature molten salt heat storage heating subsystem is preferentially started, and under the condition that the gas turbine generator set generates electricity (in general, when the gas turbine generates electricity, the condition that new energy is insufficient in power supply, namely the condition of large electricity consumption), the gas turbine generator set heating subsystem also heats a user so as to avoid wasting heat in high-temperature tail gas of the gas turbine 17. Of course, in the heating process, the required heat of a heating user and the heat storage capacity of molten salt need to be monitored and adjusted in real time, so that the water temperature is ensured to be maintained in a normal horizontal range.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. The utility model provides a combined cycle unit heating system, its characterized in that, includes gas turbine generator set heating subsystem, gas turbine generator set heating subsystem includes waste heat boiler (21), steam-water heat exchanger (28) and condenser (25) that communicate in proper order and form the closed loop through the pipeline, still be equipped with first cold water entry (a) and first hot water export (b) of mutual intercommunication on steam-water heat exchanger (28), first cold water entry (a) with first hot water export (b) all are suitable for switching into heating pipe network (c), waste heat boiler (21) are suitable for the gas vent through pipeline intercommunication gas turbine (17).

2. A combined cycle unit heating system according to claim 1, characterized in that the steam outlet of the waste heat boiler (21) is connected to a steam turbine (23) by means of a pipe, the steam turbine (23) being adapted to be connected to a steam turbine generator (24).

3. A combined cycle unit heating system according to claim 1, characterized in that a condensate water feed pump (27) is arranged on the line between the condenser (25) and the waste heat boiler (21).

4. A combined cycle unit heating system according to claim 1, characterized in that the waste heat boiler (21) is internally provided with a superheater (18), an evaporator (19) and an economizer (20) which are connected in sequence.

5. A combined cycle unit heating system according to any one of claims 1-4, further comprising a high temperature molten salt heat storage heating subsystem connected in series with the gas turbine generator unit heating subsystem to the heating network (c).

6. The combined cycle unit heating system according to claim 5, wherein the high-temperature molten salt heat storage heating subsystem comprises a molten salt heater (3), a high-temperature molten salt storage tank (5), a molten salt-water heat exchanger (7) and a low-temperature molten salt storage tank (9) which are sequentially communicated through pipelines, a second cold water inlet (d) and a second hot water outlet (e) are further arranged on the molten salt-water heat exchanger (7), and the second cold water inlet (d) and the second hot water outlet (e) are both suitable for being connected into the heating pipe network (c).

7. A combined cycle unit heating system according to claim 6, characterized in that the molten salt heater (3) is an electric heater.

8. A combined cycle unit heating system according to claim 7, characterized in that the molten salt heater (3) is powered by electricity from a valley or from surplus electricity generated by new energy sources.

9. A combined cycle unit heating system according to claim 6, characterized in that on the pipeline between the molten salt heater (3) and the high temperature molten salt storage tank (5) and on the pipeline between the molten salt-water heat exchanger (7) and the low temperature molten salt storage tank (9) are respectively provided with a high temperature molten salt pipeline valve (4) and a low temperature molten salt pipeline valve (8), and/or on the upstream pipeline of the steam-water heat exchanger (28) is provided with a heating steam valve (22) suitable for controlling the on-off of heating steam, and/or on the pipeline between the high temperature molten salt storage tank (5) and the molten salt-water heat exchanger (7) and on the pipeline between the low temperature molten salt storage tank (9) and the molten salt heater (3) are respectively provided with a high temperature molten salt pump (6) and a low temperature molten salt pump (10), and/or the hot water end of the heating pipe network (c) is provided with a hot water supply valve (11), and the cold water end of the heating pipe network (c) is provided with a cold water supply pump (13).

10. The combined cycle unit heating system of claim 1, wherein the combined cycle unit heating system is used in conjunction with a new energy power generation system.