CN217584405U

CN217584405U - Concurrent heating formula thermal power generating unit and electric wire netting

Info

Publication number: CN217584405U
Application number: CN202123194343.0U
Authority: CN
Inventors: 崔华
Original assignee: Hepp Energy Environment Technology Co ltd
Current assignee: Hepp Energy Environment Technology Co ltd
Priority date: 2021-03-08
Filing date: 2021-12-17
Publication date: 2022-10-14
Anticipated expiration: 2031-12-17
Also published as: CN115031227B; CN115031227A

Abstract

The invention discloses a concurrent heating type thermal power generating unit and a power grid, wherein the concurrent heating type thermal power generating unit comprises: the unit body is used for generating electricity through heat generation; the heat supplementing device is communicated with the unit body and used for supplementing heat to the unit body through combustion heating and conveying flue gas generated by combustion to the unit body. According to the thermal power generating unit, the heat supplementing device is used for supplementing heat to the unit body during the power utilization peak so as to increase the generated energy of the whole thermal power generating unit and meet the power utilization requirement, and the heat supplementing device conveys flue gas generated by combustion to the unit body for recycling waste heat of the flue gas and pollutants, so that the energy utilization rate can be improved, and the pollutant emission can be reduced.

Description

Concurrent heating formula thermal power generating unit and electric wire netting

Technical Field

The invention belongs to the technical field of power generation, and particularly relates to a concurrent heating type thermal power generating unit and a power grid.

Background

At present, the difference of power consumption peak and valley is large. The rapid growth of new energy sources such as wind power and photovoltaic can well meet the requirement of newly increased electric quantity, but the intermittent and fluctuating property of the new energy sources can not realize low stable power supply. Meanwhile, under the condition that the carbon emission constraint is tightened, a large number of coal-electric machine sets cannot be newly built in various places, and the problem of insufficient peak power under certain conditions is caused. In many areas, the problem of insufficient power supply occurs in peak electricity utilization periods, and normal operation of the economic society is affected.

Disclosure of Invention

Objects of the invention

The invention aims to provide a concurrent heating type thermal power generating unit capable of meeting the electricity consumption of users at the end of an electricity consumption peak period and an electricity grid.

(II) technical scheme

A first aspect of the present invention provides a concurrent heating thermal power generating unit, including: the unit body is used for thermal power generation; the heat supplementing device is communicated with the unit body and is used for supplementing heat to the unit body through combustion heating; wherein, the concurrent heating device includes: the first heating part is used for heating condensed water in the unit body through combustion heat release of combustible gas and combustion-supporting gas; the second heating part is communicated with the first heating part and is used for receiving flue gas generated by combustion of the combustible gas and the combustion-supporting gas and heating condensed water in the unit body through the heat of the flue gas; the smoke outlet is communicated with the smoke inlet of the unit body and used for discharging smoke which releases heat in the second heating part to the unit body; wherein a cold side of the first heating part communicates with a hot side of the second heating part.

Further, the unit body includes: the heat source is used for heating the condensed water to generate steam, and comprises a flue gas inlet which is communicated with a flue gas outlet of the concurrent heating device and is used for receiving flue gas and heating the condensed water through heat release of the flue gas; a steam turbine in communication with the hot steam outlet for generating electricity from the steam; the steam condensing device is communicated with a steam outlet of the steam turbine and is used for condensing steam into condensed water; and the heating device is respectively communicated with the steam outlet of the heat source, the steam outlet of the steam turbine, the condensed water outlet of the condensing device and the condensed water inlet of the heat source, and is used for heating the condensed water through steam and conveying the heated condensed water to the heat source.

Further, the heat compensating device further comprises: a combustible gas inlet; a combustion supporting gas inlet; and water temperature control devices respectively arranged at the combustible gas inlet and the combustion-supporting gas inlet and used for controlling the water temperature flowing out of the condensed water outlet of the first heating part by controlling the flow rates of the combustible gas and the combustion-supporting gas.

Further, the steam outlet of the heat source includes: a first steam outlet and a second steam outlet; the steam turbine includes: a high pressure cylinder, a steam inlet of which is communicated with the first steam outlet, and a steam outlet of which is communicated with the steam inlet of the heat source; the steam inlet of the intermediate pressure cylinder is communicated with the second steam outlet of the heat source; and the steam inlet of the low pressure cylinder is communicated with the steam outlet of the medium pressure cylinder, and the steam outlet of the low pressure cylinder is communicated with the steam inlet of the condensing device.

Further, the heating device includes: a condensed water inlet of the low-pressure heater is communicated with a condensed water outlet of the condensing device, and a steam inlet of the low-pressure heater is communicated with a steam outlet of the intermediate pressure cylinder and/or a steam outlet of the low pressure cylinder; and a condensed water inlet of the high-pressure heater is communicated with a condensed water outlet of the low-pressure heater, and a steam inlet of the high-pressure heater is communicated with a steam outlet of the high-pressure cylinder and/or a steam outlet of the intermediate-pressure cylinder.

Further, a condensed water inlet of the second heating part is communicated with a condensed water outlet of the condensing device, and the condensed water outlet of the second heating part is communicated with a condensed water inlet of the high-pressure heater; the first heating part is connected in parallel with the high-pressure heater.

Further, a condensed water inlet of the second heating part is communicated with a condensed water outlet of the condensing device, and the condensed water outlet of the second heating part is communicated with a condensed water inlet of the high-pressure heater; the condensed water inlet of the first heating part is communicated with the condensed water outlet of the high-pressure heater, and the condensed water outlet and inlet of the first heating part are communicated with the condensed water inlet of the heat source.

Further, the thermal power generating unit further comprises: and a condensed water inlet of the deaerator is communicated with a condensed water outlet of the low-pressure heater, a condensed water outlet of the deaerator is communicated with a condensed water inlet of the high-pressure heater, and a steam inlet of the deaerator is communicated with a steam outlet of the intermediate pressure cylinder.

A second aspect of the invention provides a power grid comprising the thermal power generating unit as provided in the first aspect of the invention.

(III) advantageous effects

The technical scheme of the invention has the following beneficial technical effects:

according to the heat-supplementing thermal power generating unit, the heat-supplementing device is used for supplementing heat to the unit body during the power utilization peak so as to increase the generated energy of the whole thermal power generating unit and meet the power utilization requirement, and the heat-supplementing device conveys the flue gas generated by combustion to the unit body for recycling the waste heat of the flue gas and recovering pollutants, so that the energy utilization rate can be improved, and the pollutant emission can be reduced.

Drawings

Fig. 1 is a schematic structural view of a thermal power generating unit according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of the unit body according to the first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a thermal power generating unit according to an example of the first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a thermal power generating unit according to another example of the first embodiment of the present invention;

fig. 5 is a schematic structural view of a heating furnace according to an exemplary embodiment of the first embodiment of the present invention.

Reference numerals:

100: a unit body; 110: a heat source; 120: a steam turbine; 121: a high pressure cylinder; 122: an intermediate pressure cylinder; 123: a low pressure cylinder; 130: a condensing unit; 140: a heating device; 141: a low pressure heater; 142: a high pressure heater; 150: a deaerator; 161: a water two-way valve; 162: a water three-way valve; 171: a steam extraction valve; 172: a steam three-way valve; 181: a feed pump;

200, a heat supplementing device; 210: a first heating section; 220: a second heating section; 230: a flue gas outlet; 240: a burner; 250: a radiation chamber; 260: a convection chamber; 270: a denitration device; 280: a chimney;

300: an electric generator.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings in combination with the embodiments. It is to be understood that these descriptions are only illustrative and are not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

In the drawings a schematic view of a layer structure according to an embodiment of the invention is shown. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of the various regions, layers and their relative sizes, positional relationships are shown in the drawings as examples only, and in practice deviations due to manufacturing tolerances or technical limitations are possible, and a person skilled in the art may additionally design regions/layers with different shapes, sizes, relative positions according to the actual needs.

In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The thermal power generating unit is still the basic power supply in China, and the total installed capacity exceeds 12 hundred million kilowatts. Existing thermal power units are utilized, upgrading and transformation are carried out on the existing thermal power units, the power output of the existing thermal power units at the moment of power utilization peaks is improved, the requirement for newly increased power loads is met, and the method is an important measure for achieving safe and stable operation of a power system in China.

At present, two technical routes are mainly used for improving the peak regulation capability of a coal-electric machine set and realizing capacity increase.

Firstly, excavate existing coal electric unit's potentiality, increase thermal coal through the burning to reform transform the boiler, promote the evaporation capacity of boiler, and then realize the many hair of coal electric unit and increase hair.

And secondly, by adding electrochemical energy storage equipment, energy is stored in a low-load time period, and energy is released in an electricity utilization peak time period, so that peak regulation is realized.

However, after the boiler operates for a period of time, the maximum evaporation capacity is difficult to achieve due to the influence of factors such as aging of parts, change of coal types and the like, and the effect of capacity increase is not obvious.

2. The electrochemical energy storage technical route has the factors of high price, low energy density, poor safety and the like, so that the electrochemical energy storage technical route can be demonstrated only in a small scale.

First embodiment

Referring to fig. 1, the present embodiment provides an auxiliary heating type thermal power generating unit, including: a unit body 100 for generating electricity by generating heat; the heat supplementing device 200 is communicated with the unit body 100, and is used for supplementing heat to the unit body 100 through combustion heating and conveying flue gas generated by combustion to the unit body 100; wherein the heat compensating device 200 comprises: a first heating part 210 for heating the condensed water in the unit body 100 by heat release through combustion of a combustible gas and a combustion-supporting gas; the second heating part 220 is communicated with the first heating part 210, and is configured to receive flue gas generated by combustion of the combustible gas and the combustion-supporting gas, and heat condensed water in the unit body 100 by heat of the flue gas; a flue gas outlet 230, which is communicated with the flue gas inlet of the unit body 100, and is used for discharging the flue gas, which is subjected to heat release in the second heating unit 220, to the unit body 100; a cold side of the first heating part 210 is communicated with a hot side of the second heating part 220, and the first person does not heat the condensed water heated by the second heating part 220. The thermal power unit of this embodiment is through when the power consumption peak, carries out the concurrent heating to unit body 100 with concurrent heating device 200 to increase whole thermal power unit's generated energy, satisfy the power consumption demand, and concurrent heating device 200 carries the flue gas that the burning produced to unit body 100, carries out the waste heat reuse of flue gas and the recovery of pollutant, can improve energy utilization and rate, reduce pollutant emission.

Referring to fig. 2, in an alternative embodiment, the assembly body 100 includes: the heat source 110 is configured to heat the condensed water to generate steam, and the heat source 110 includes a flue gas inlet, which is communicated with the flue gas outlet 230 of the heat compensation device 200 and is configured to receive flue gas and heat the condensed water through heat release of the flue gas; a steam turbine 120 in communication with the hot steam outlet for generating electricity from the steam; a condensing unit 130, which is communicated with a steam outlet of the steam turbine 120, and is used for condensing steam into condensed water; and a heating device 140 respectively communicated with the steam outlet of the heat source 110, the steam outlet of the steam turbine 120, the condensed water outlet of the condensing device 130, and the condensed water inlet of the heat source 110, and configured to heat the condensed water by using steam and to deliver the heated condensed water to the heat source 110. The heat source 110 may be a coal-fired boiler of a coal-fired power plant, and is configured to convert chemical energy of coal into heat energy, generate steam for condensed water, and send the steam to the steam turbine 120. The steam condenser 130 may be a condenser, which is a heat exchanger for condensing steam discharged from the steam turbine into water.

In an alternative embodiment, the heat supplying device 200 further comprises: a combustible gas inlet; a combustion supporting gas inlet; and water temperature control means provided at the combustible gas inlet and the combustion-supporting gas inlet, respectively, for controlling a water temperature flowing out from the condensed water outlet of the first heating part 210 by controlling flow rates of the combustible gas and the combustion-supporting gas. So as to achieve the purpose of controlling the heat supplementing degree. Further optionally, the water temperature control device controls the outlet water temperature by controlling the primary energy and air flow of the heating furnace, so as to ensure that the water temperatures of the deaerator inlet and the boiler inlet are in an allowable range. If the feed water temperature is too low or too high, the hydrodynamic balance of the boiler and the flue gas denitration can be influenced.

In an alternative embodiment, the vapor outlet of the heat source 110 includes: a first steam outlet and a second steam outlet; the steam turbine 120 includes: a high pressure cylinder 121 having a steam inlet communicated with the first steam outlet, and a steam outlet of the high pressure cylinder 121 communicated with the steam inlet of the heat source 110; an intermediate pressure cylinder 122 having a steam inlet communicating with a second steam outlet of the heat source 110; the low pressure cylinder 123 has a steam inlet communicated with the steam outlet of the intermediate pressure cylinder 122, and the steam outlet of the low pressure cylinder 123 is communicated with the steam inlet of the condenser 130. The steam turbine 120 is provided with a pneumatic cylinder with sequentially reduced pressure, so that heat energy is converted into mechanical energy in a grading manner, and the conversion efficiency is high.

In an alternative embodiment, the heating device 140 includes: a low-pressure heater 141 having a condensed water inlet communicated with a condensed water outlet of the condensing unit 130, and a steam inlet of the low-pressure heater 141 communicated with a steam outlet of the intermediate pressure cylinder 122 and/or a steam outlet of the low-pressure cylinder 123; and a high pressure heater 142 having a condensed water inlet in communication with the condensed water outlet of the low pressure heater 141, and a steam inlet of the high pressure heater 142 in communication with the steam outlet of the high pressure cylinder 121 and/or the steam outlet of the intermediate pressure cylinder 122. That is, the steam inlet of the high pressure heater 142 may be communicated with the steam outlet of the high pressure cylinder 121 and the steam outlet of the intermediate pressure cylinder 122, or the steam inlet of the high pressure heater 142 may be communicated with one of the steam outlet of the high pressure cylinder 121 and the steam outlet of the intermediate pressure cylinder 122. The condensed water is heated in a staged manner by the low pressure heater 141 and the high pressure heater 142 so that the condensed water returned to the heat source 110 reaches a specified temperature range, wherein the number of the low pressure heater 141 and the high pressure heater 142 may be 3.

Referring to fig. 3, in an alternative embodiment, the condensed water inlet of the second heating part 220 is communicated with the condensed water outlet of the condensing device, and the condensed water outlet of the second heating part 220 is communicated with the condensed water inlet of the high pressure heater 142; the first heating part 210 is connected in parallel to the high pressure heater 142. Specifically, the first heating part 210 is connected in parallel to the high pressure heater 142 such that a condensed water inlet of the first heating part 210 communicates with a condensed water inlet of the high pressure heater 142, and a condensed water outlet and inlet of the first heating part 210 communicate with a condensed water outlet of the high pressure heater 142. That is, the second heating part 220 cooperates with the low pressure heater 141 to heat the condensed water, and the first heating part 210 cooperates with the high pressure heater 142 to further heat the condensed water heated by the second heating part 220 and the low pressure heater 141.

Referring to fig. 4, in an alternative embodiment, the condensed water inlet of the second heating part 220 is communicated with the condensed water outlet of the condensing device, and the condensed water outlet of the second heating part 220 is communicated with the condensed water inlet of the high pressure heater 142; a condensed water inlet of the first heating part 210 is communicated with a condensed water outlet of the high pressure heater 142, and a condensed water outlet and inlet of the first heating part 210 are communicated with a condensed water inlet of the heat source 110. The second heating part 220 heats the condensed water by cooperating with the low pressure heater 141, and then the high pressure heater 142 further heats the condensed water heated by the second heating part 220 and the low pressure heater 141, and finally the first heating part 210 heats the condensed water heated by the high price heater, and the heated water flows into the heat source 110.

In an alternative embodiment, the heat compensating device 200 is a heating furnace: the heating furnace may be arranged in parallel with the high pressure heater 142 or in series with the high pressure heater 142, using a device that heats water using primary energy such as natural gas, oil, coal, biomass, etc. In a parallel arrangement, the feed water bypass point may be located between the high pressure heater 142 and the feed water pump 181, or may be located between the high pressure heater 142. When arranged in series, the heating furnace may be located between the high pressure heater 142 and the boiler, between the two stages of high pressure heaters 142, or between the high pressure heaters 142 and the feed pump 181. The heating furnace comprises a combustor, a radiation chamber, a convection chamber, a desulfurization and denitrification device, a chimney and other devices, and heats water by burning primary energy such as natural gas or oil or coal or biomass. The heating furnace of the embodiment can be of a single-pressure type, and only high-pressure feed water is heated at the moment; or a double pressure type, in this case, the high pressure water supply heating and the medium pressure condensed water heating are performed. Because the feed water temperature is higher, the single-pressure type exhaust gas temperature is higher, and the efficiency is lower; the double-pressure type uses the flue gas for heating condensed water, the exhaust temperature is lower, and the efficiency is higher. The present embodiment mainly adopts a dual pressure type. The heating furnace has no evaporation link, so the load regulation speed is high, the heat exchange function power can be quickly increased and decreased, and conditions are created for the thermal power generating unit to participate in quick frequency modulation. In addition, heating furnace exhaust flue gas can send into coal fired boiler and carry out SOx/NOx control, can cancel the SOx/NOx control facility in the heating furnace this moment to can further retrieve the waste heat, also can set up solitary SOx/NOx control device, directly discharge the chimney.

Referring to fig. 3 or fig. 4, in an alternative embodiment, the thermal power generating unit further includes: the condensed water inlet of the deaerator 150 is communicated with the condensed water outlet of the low pressure heater 141, the condensed water outlet of the deaerator 150 is communicated with the condensed water inlet of the high pressure heater 142, and the steam inlet of the deaerator 150 is communicated with the steam outlet of the intermediate pressure cylinder 122. The deaerator 150 is used for removing dissolved oxygen and other gases in condensed water in the thermal power generating unit and preventing the thermal equipment from being corroded. The input is condensed water and high-temperature steam, and the output is condensed water. The temperature in the deaerator 150 should be just at or above the overflow temperature of the gas so that the deaerator 150 can function properly. For example, the intermediate pressure cylinder 122 of the thermal power generating unit of the embodiment has a temperature of about 580 ° and a pressure of about 1 to 2kp, and can heat the condensed water in the deaerator 150.

Referring to fig. 3 or fig. 4, in an alternative embodiment, the thermal power generating unit further includes: and valves are arranged between the steam turbine 120 and the heating device 140, between the condensing unit 130 and the heating device 140, and between the condensing unit 130 and the heat storage device, and are used for controlling the flow of steam or condensed water. Optionally, the valve comprises: the condensate valve is used for controlling the flow and the flow speed of condensate in the unit body 100, wherein the condensate valve can be set as a water two-way valve 161 or a water three-way valve 162 according to requirements. The valve further comprises: and a steam valve for controlling the flow rate of the steam, wherein the steam valve can be set as an extraction valve 171 or a steam three-way valve 172 as required.

Referring to fig. 3 or fig. 4, in an alternative embodiment, the thermal power generating unit further includes: and a water feed pump 181 for pressurizing the condensed water deaerated by the deaerator 150 and feeding the pressurized condensed water to the high pressure heater 142 and/or the heat compensating device 200.

The scheme of the embodiment realizes the great capacity increase of the coal-electric unit. On the premise of not influencing the operation safety and stability of the coal-fired boiler and the steam turbine 120, the power generation capacity of the existing coal-electric machine set can be increased by 5-10%. And the energy density is high, and the method is suitable for large-scale popularization. Considering that the floor area required by the project is only 2000 square meters for a 350MW coal-electric machine set, so the method is suitable for large-scale popularization.

The thermal power generating unit adopting the scheme of the embodiment is high in overall efficiency. The cascade utilization of the combustion temperature is realized, and the flue gas temperature of the heating furnace is reduced.

The thermal power generating unit adopting the scheme of the embodiment is low in overall cost. The existing equipment for storing the coal and electricity is utilized, and the unit kilowatt cost of the newly-added generating capacity can be reduced to below 1000 yuan/kW which is far lower than that of the newly-added thermal power station.

In an exemplary embodiment, the present embodiment provides a supplementary heating capacity-increasing peak-shaving modification to a 350MW coal-electric power unit.

Basic conditions of unit

The unit is an ultra-supercritical once-reheating unit, the main steam parameters are 566 ℃ and 24.2MPa, the reheating steam parameters are 566 ℃ and 3.5MPa, and the boiler evaporation capacity is 1025t/h under the THA working condition. The steam extraction parameters of the steam turbine to the high-pressure heater, the deaerator and the low-pressure heater under the THA working condition are as follows:

	pressure (Mpa)	Temperature (. Degree.C.)	Enthalpy (kJ/kg)	Steam extraction (t/h)
					Steam turbine 1# Gaogai	5.8	357.5	3069.9	63.7
Steam turbine 2# Gaogai	3.9	306.3	2982.5	56.9
					Steam turbine 3# Gaogai	2	480.3	3424.7	33.6
Steam engine to deaerator	1	383.9	3230.1	35.5
					Steam turbine 1# low pressure heater	0.53	297.9	3059.5	24.0
Steam turbine 2# low pressure heater	0.32	249.5	2966.2	42.7
					Steam turbine to 3# Low pressure heater	0.11	102.5	2679.6	55.6

(II) machine set transformation scheme

4 sets of gas heating furnaces (see figure 5) are additionally arranged and are placed between a boiler and a No. 1 high-pressure heater, and natural gas is used for combustion heating water supply; and the bypass part of condensed water is sent to a flue of the heater path, and the flue gas is used for heating the condensed water.

The gas heating furnace comprises a burner, a radiation chamber, a convection chamber, a denitration device, a chimney and the like. Wherein, the indoor first heating portion that is provided with of radiant, the chimney is provided with above-mentioned second heating portion, and gas heating furnace is two return circuits water supply, main technical parameter:

9633rated thermal load: 30MW;

9633has high thermal efficiency: 93 percent.

9633the design pressure of the No. 1 water loop furnace tube is 20MPa, the rated flow is 250t/h, the water temperature at the inlet is 180 ℃, the water temperature at the outlet is 275 ℃, and the pressure drop of the water loop furnace is 0.2MPa.

9633design pressure of the #2 water loop furnace tube: 3MPa, rated flow 25t/h, inlet water temperature of 50 ℃, outlet water temperature of 130 ℃ and water loop furnace pressure drop of 0.1MPa.

9633where the fume is discharged at 80 deg.C.

(III) peak regulation operation of unit

When the power demand of the power grid is increased, the extraction steam from the steam turbine to the high-pressure heater is gradually reduced, the extraction steam from the steam turbine to the low-pressure heater is reduced, the gas heating furnace is started, and the water temperature at the inlet of the boiler and the deaerator is ensured to be in a reasonable temperature range. And after the peak regulation is finished, stopping the heating furnace, and recovering the steam extraction from the steam engine to the high-pressure heater and the low-pressure heater.

(IV) Effect of implementation

And at the peak moment of power utilization, reducing the steam extraction from the steam engine to the high-pressure heater to 20% of the THA working condition, and reducing the working condition from the steam engine to the low-pressure heater to 90% of the THA working condition. At this time, the amount of steam flowing through the last stage blade of the high pressure cylinder of the turbine is increased by 51t/h, the amount of steam flowing through the intermediate pressure cylinder of the turbine is increased by 96t/h, and the flow rate of steam flowing through the low pressure cylinder of the turbine is increased by about 130/h. The calculation can obtain that the power increase of 51MW can be realized, and the overload capacity of the steam turbine is not exceeded by 15%. The output power of the generator set is increased from 350MW to 401MW.

The power generation increasing part has the heat consumption of 125MW (the natural gas consumption is 1.3 ten thousand cubic meters per hour), and the equivalent power generation efficiency of the power generation increasing part is 42%.

Second embodiment

The embodiment provides a power grid comprising the concurrent heating thermal power generating unit provided by the first embodiment of the invention.

The same parts of this embodiment as those of the first embodiment will not be described herein.

Third embodiment

The embodiment provides a power generation method, including: the thermal power generating unit with the heat compensation function provided in the first embodiment of the present invention is used for power generation, or the power grid provided in the second embodiment of the present invention is used for power generation.

In an alternative embodiment, the present embodiment provides a method for increasing the number of sets. Specifically, when the system needs the steam turbine set to run beyond the rated load, the opening of a steam extraction valve from a high-pressure cylinder and a medium-pressure cylinder of the steam turbine to a high-pressure heater is preferably adjusted to be small, the opening of a water valve of a water supply bypass channel is adjusted to be large, the water supply passing through the high-pressure heater is reduced, all or part of the water supply is heated by a heating furnace, and the heat exchange quantity is controlled by controlling the input of primary energy, so that the water supply temperature is in an allowable range; meanwhile, the steam valve opening of the steam turbine from the intermediate pressure cylinder and the low pressure cylinder to the low pressure heater can be reduced by properly reducing the opening, the water supply valve opening of the condensed water bypass channel is increased, part of condensed water is heated by the heating furnace, and the temperature of condensed water at the inlet of the deaerator is controlled to be within an allowable range. If the high-pressure heater is completely bypassed, the output power of the steam turbine can reach more than 110% of the rated power of the steam turbine.

In an alternative embodiment, the present embodiment provides a method of secondary frequency modulation. Specifically, the secondary frequency modulation capability of the thermal power generating unit is mainly limited by the inertia of the coal-fired boiler (namely, the heat source), different from the boiler, the heating furnace performs explicit heat exchange with feed water and condensed water, no evaporation link exists, and the heat exchange power regulation speed is far higher than the speed of regulating the temperature and the flow of main steam by the coal-fired boiler. When the system participates in secondary frequency modulation, if the output power of the steam turbine is required to be increased rapidly, the steam valve is used for reducing the high-pressure cylinder and the medium-pressure cylinder of the steam turbine to the high-pressure heater for steam extraction, at the moment, the flow of steam flowing through the steam turbine is increased, the output power of the steam turbine can be increased rapidly, meanwhile, the water supply valve of the water supply bypass channel is used for increasing the water supply to the heating furnace, primary energy and air flow are increased, heat exchange power is improved, and the water supply temperature is ensured to be at a normal level; if the output power of the steam turbine needs to be reduced rapidly, the steam flow of the steam turbine flowing through the steam turbine is reduced by adjusting the high-pressure cylinder and the intermediate-pressure cylinder of the steam turbine to the high-pressure heater through the steam valves, the output power of the steam turbine can be reduced rapidly, meanwhile, the water supply to the heating furnace is reduced through the water supply valve of the water supply bypass channel, primary energy and air flow are increased, heat exchange power is reduced, and the water supply temperature is guaranteed to be at a normal level.

In an optional embodiment, this embodiment provides a flue gas recovery method, specifically, the flue gas discharged from the heating furnace can be sent to a coal-fired boiler for desulfurization and denitrification, at this moment, a desulfurization and denitrification facility in the heating furnace can be eliminated, and waste heat can be further recovered, and a separate desulfurization and denitrification device can also be provided, and the flue gas is directly discharged into a chimney.

This patent provides a thermal power unit, electric wire netting and power generation method, and the thermal power unit includes: the unit body is used for generating electricity through heat generation; the heat supplementing device is communicated with the unit body and used for supplementing heat to the unit body through combustion heating and conveying flue gas generated by combustion to the unit body. And a heat supplementing device is added for the water supply and the condensed water of the unit body. At the peak moment of power consumption, the steam extraction from the steam turbine to the high-pressure heater and the low-pressure heater is reduced, the heating furnace is used for heating the feed water and the condensed water, the water temperature of the main node of the steam-water system is guaranteed to be in a normal level, the steam flow flowing through the steam turbine body after the steam extraction is reduced is increased, and the power generation increase of the thermal power generating unit can be realized. Meanwhile, the exhaust smoke of the heat supplementing device is sent to the existing coal-fired boiler for waste heat recovery and pollutant treatment, so that the energy efficiency is improved, and the pollutant emission is reduced.

It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modifications, equivalents, improvements and the like which are made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundary of the appended claims, or the equivalents of such scope and boundary.

Claims

1. A concurrent heating formula thermal power generating unit, its characterized in that includes:

a unit body (100) for thermal power generation;

the heat supplementing device (200) is communicated with the unit body (100) and is used for supplementing heat to the unit body (100) through combustion heating;

wherein the heat replenishing device (200) comprises:

a first heating unit (210) for heating the condensed water in the unit body (100) by heat released by combustion of a combustible gas and a combustion-supporting gas;

the second heating part (220) is communicated with the first heating part (210) and is used for receiving flue gas generated by combustion of the combustible gas and the combustion-supporting gas and heating condensed water in the unit body (100) through the heat of the flue gas;

a flue gas outlet (230) which is communicated with the flue gas inlet of the unit body (100) and is used for discharging the flue gas heated in the second heating part (220) to the unit body (100); +

Wherein a cold side of the first heating part (210) communicates with a hot side of the second heating part (220).

2. The thermal power generating unit according to claim 1, wherein the unit body (100) includes:

the heat source (110) is used for heating the condensed water to generate steam, the heat source (110) comprises a flue gas inlet, and the flue gas inlet is communicated with a flue gas outlet (230) of the heat supplementing device (200) and is used for receiving flue gas and heating the condensed water through flue gas heat release;

a steam turbine (120) in communication with a steam outlet of the heat source (110) for generating electricity from the steam;

the steam condensing device (130) is communicated with a steam outlet of the steam turbine (120) and is used for condensing steam into condensed water;

and the heating device (140) is respectively communicated with the steam outlet of the heat source (110), the steam outlet of the steam turbine (120), the condensed water outlet of the condensing device (130) and the condensed water inlet of the heat source (110), and is used for heating the condensed water through steam and conveying the heated condensed water to the heat source (110).

3. The thermal power generating unit according to claim 2, wherein the thermal power unit (200) further comprises:

a combustible gas inlet;

a combustion supporting gas inlet;

and water temperature control devices respectively arranged at the combustible gas inlet and the combustion-supporting gas inlet and used for controlling the water temperature flowing out of the condensed water outlet of the first heating part (210) by controlling the flow rates of the combustible gas and the combustion-supporting gas.

4. The concurrent heating thermal power generating unit according to claim 2,

the steam outlet of the heat source (110) comprises: a first steam outlet and a second steam outlet;

the steam turbine (120) comprises:

a high pressure cylinder (121) having a steam inlet in communication with the first steam outlet, the steam outlet of the high pressure cylinder (121) being in communication with the steam inlet of the heat source (110);

an intermediate pressure cylinder (122) having a steam inlet in communication with a second steam outlet of the heat source (110);

and a steam inlet of the low pressure cylinder (123) is communicated with a steam outlet of the intermediate pressure cylinder (122), and a steam outlet of the low pressure cylinder (123) is communicated with a steam inlet of the condensing device (130).

5. The thermal power generating unit according to claim 4, wherein the heating device (140) comprises:

a low-pressure heater (141) having a condensed water inlet in communication with a condensed water outlet of the condensing device (130), and a steam inlet of the low-pressure heater (141) in communication with a steam outlet of the intermediate pressure cylinder (122) and a steam outlet of the low pressure cylinder (123);

and a high-pressure heater (142) having a condensed water inlet in communication with the condensed water outlet of the low-pressure heater (141), and a steam inlet of the high-pressure heater (142) in communication with the steam outlet of the high-pressure cylinder (121) and the steam outlet of the intermediate-pressure cylinder (122).

6. The thermal power generating unit according to claim 5,

a condensed water inlet of the second heating part (220) is communicated with a condensed water outlet of a condensing device, and a condensed water outlet of the second heating part (220) is communicated with a condensed water inlet of the high-pressure heater (142);

the first heating part (210) is connected in parallel with the high-pressure heater (142).

7. The thermal power generating unit according to claim 5,

a condensed water inlet of the first heating part (210) is communicated with a condensed water outlet of the high-pressure heater (142), and a condensed water outlet and inlet of the first heating part (210) are communicated with a condensed water inlet of the heat source (110).

8. The concurrent heating thermal power generating unit according to claim 5, further comprising:

and a condensed water inlet of the deaerator (150) is communicated with a condensed water outlet of the low-pressure heater (141), a condensed water outlet of the deaerator (150) is communicated with a condensed water inlet of the high-pressure heater (142), and a steam inlet of the deaerator (150) is communicated with a steam outlet of the intermediate pressure cylinder (122).

9. An electrical grid comprising a thermal supplementary power generating unit according to any one of claims 1 to 8.