CN113638781A - Power generation system and thermal generator set - Google Patents
Power generation system and thermal generator set Download PDFInfo
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- CN113638781A CN113638781A CN202110937722.XA CN202110937722A CN113638781A CN 113638781 A CN113638781 A CN 113638781A CN 202110937722 A CN202110937722 A CN 202110937722A CN 113638781 A CN113638781 A CN 113638781A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K19/00—Regenerating or otherwise treating steam exhausted from steam engine plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The embodiment of the application relates to the technical field of energy, in particular to a power generation system and a steam turbine set; the system comprises a steam turbine set, a fused salt energy storage and release system, a steam supplementing and frequency modulating system and a condensation water supply system. The steam turbine set comprises a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder and a communicating pipe which are connected with each other; the molten salt energy storage and release system comprises a main steam molten salt heat exchanger, a reheat steam molten salt heat exchanger, a hot molten salt tank, a cold molten salt tank and a molten salt steam heater; the steam supplementing frequency modulation system comprises a low-pressure steam bypass and a steam supplementing regulating valve; the condensate water supply system comprises a condenser and a condensate pump. Compared with the prior art, the embodiment of the application saves energy on one hand; on the other hand, the regulating precision of the primary frequency modulation of the steam turbine set is improved, the frequency modulation response rate is increased, and the frequency modulation response time is reduced; therefore, the method is safe and reliable and has good economic effect.
Description
Technical Field
The embodiment of the application relates to the technical field of energy, in particular to a power generation system and a steam turbine set.
Background
With the rapid development of new energy construction such as domestic wind power, solar energy and the like, the regional power grid structure becomes more and more complex. As is well known, the predictability and controllability of power generation by new energy resources such as wind power, solar energy and the like are relatively poor, and the contribution capacity of primary frequency modulation is limited, so that when the frequency of a power grid fluctuates greatly due to external reasons such as grid connection of high-power users, tripping of high-capacity units and the like, the higher the wind power grid connection load is, the more difficult the power grid adjustment is.
The thermal generator set is a set which uses coal, oil or combustible gas as fuel, heats water in a boiler to raise the temperature, and then uses steam with certain pressure to drive a gas turbine to generate electricity.
The existing thermal generator set adopts a main steam regulating valve pre-throttling technology to perform primary frequency modulation, and as the dead zone of the main steam regulating valve is larger and the system inertia of the thermal generator set is very large, the response of the set during primary frequency modulation is slow, the adjustment precision is low, and the over-modulation condition is easy to generate, the technology is generally used for feeding back insufficient frequency modulation capability and poor frequency modulation operation economy in the actual operation of a power plant; in addition, the newly developed battery frequency modulation is easy to cause fire explosion due to out-of-control thermal load due to the chemical characteristics of the battery, and has great influence on safety production, so that the power plant is seriously concerned when the battery frequency modulation is used.
However, the requirement of users on the quality of electric energy is continuously increased, so how to guarantee the technical indexes of the frequency, the voltage and the like of the power grid while ensuring the rapid development of the power grid becomes an important technical problem.
Meanwhile, due to the rapid development of new energy power generation and the surplus of coal power generation in China, a thermal power generating set operates at low load throughout the year. In order to avoid abandoning light and wind, in the valley power time period, the load of the thermal generator set should be reduced as much as possible due to the consideration of environmental protection and energy conservation, but the thermal generator set needs to operate at the lowest stable combustion load (generally 40% load), and has to operate at the lowest stable combustion load in consideration of the safety and reliability of the set, which causes double losses of environmental protection and energy, and is not in line with the sustainable development of energy.
Disclosure of Invention
The embodiment of the application provides a power generation system and a thermal generator set to at least solve the problems that energy storage and primary frequency modulation response are slow and not accurate enough during the operation of the existing valley electricity.
In a first aspect, an embodiment of the present application provides a power generation system, including:
the steam turbine set comprises a main steam regulating valve, a steam turbine high-pressure cylinder, a steam turbine middle-pressure cylinder, a steam turbine low-pressure cylinder and a communicating pipe which are sequentially connected;
the molten salt energy storage and release system comprises a main steam molten salt heat exchanger, a reheat steam molten salt heat exchanger, a hot molten salt tank, a cold molten salt tank and a molten salt steam heater; an inlet of the main steam molten salt heat exchanger is connected with a high-pressure cylinder of the steam turbine, a steam outlet of the main steam molten salt heat exchanger is connected with a steam outlet of the high-pressure cylinder of the steam turbine, and a steam outlet of the main steam molten salt heat exchanger is connected with a steam outlet of the high-pressure cylinder of the steam turbine and a reheater; the inlet of the reheat steam molten salt heat exchanger is connected with the steam turbine intermediate pressure cylinder, and the steam outlet of the reheat steam molten salt heat exchanger is connected with the communicating pipe; the inlet of the hot-melt salt tank is connected with the inlet of the main steam molten salt heat exchanger, and the outlet of the hot-melt salt tank is connected with the molten salt steam heater; the inlet of the cold molten salt tank is connected with the outlet of the molten salt steam heater, and the outlet of the cold molten salt tank is connected with the inlet of the main steam molten salt heat exchanger; the inlet of the fused salt steam heater is connected with the fused salt tank, and the outlet of the fused salt steam heater is connected with the communicating pipe through the air supply regulating valve;
the steam supply frequency modulation system comprises low-pressure steam supply bypasses and steam supply regulating valves, the number of the low-pressure steam supply bypasses and the number of the steam supply regulating valves are at least 2, the at least 2 steam supply regulating valves are correspondingly arranged on each low-pressure steam supply bypass, and a steam outlet of the molten salt steam heater is connected with the communicating pipe through the at least 2 low-pressure steam supply bypasses;
and the outlet of the condenser is connected with the inlet of the fused salt steam heater through the condensate pump.
In one implementation, at least 2 low-pressure steam supply bypasses are arranged in parallel.
In one implementation, each vapor supplement regulating valve is disposed adjacent to the communicating tube.
In one implementation, the turbine low pressure cylinder is a dual split flow low pressure cylinder.
In one implementation, a throttle valve is further arranged at the inlet of the main steam molten salt heat exchanger, the inlet of the reheat steam molten salt heat exchanger and/or the inlet of the molten salt steam heater.
In a second aspect, the embodiment of the present application provides a thermal generator set, which includes the above power generation system.
Advantageous effects
The power generation system comprises a steam turbine set, a fused salt energy storage and release system, a steam supplementing frequency modulation system and a condensation water supply system, wherein when a power grid needs low or extremely low load operation of a thermal power generating set, a boiler still operates according to the lowest stable combustion load of the boiler, and redundant heat generated by the steam turbine set is stored in a fused salt tank by arranging the fused salt energy storage and release system; simultaneously, through control benefit vapour frequency modulation system to through storing the cooperation of ability system with the fused salt, utilize the heat production low pressure steam of storage, through low pressure benefit vapour bypass and benefit vapour governing valve, through setting up the benefit vapour bypass and mending vapour governing valve on the benefit vapour bypass with the low pressure steam mend the steam turbine low pressure jar and do work, thereby energy storage and the response of primary modulation slow, the not accurate problem inadequately when solving current millet electricity operation, in addition, compare with current power generation system (like thermal generator set's power generation system), not only safe and reliable, and have fine economic effect.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a power generation system according to an embodiment of the present application.
Description of reference numerals:
1. a steam turbine unit; 11. a main steam regulating valve; 12. a high-pressure cylinder of the steam turbine; 13. a turbine intermediate pressure cylinder; 14. a low-pressure cylinder of the steam turbine; 15. a communicating pipe;
2. a molten salt energy storage and release system; 21. a main steam molten salt heat exchanger; 22. a reheat steam molten salt heat exchanger; 23. a hot-melt salt tank; 24. a cold molten salt tank; 25. a molten salt steam heater;
3. a steam supplementing and frequency modulating system; 31. a low-pressure steam supply bypass; 32. a steam compensation regulating valve;
4. a condensate water supply system; 41. a condenser; 42. a condensate pump;
5. a throttle valve; 51. a first throttle valve; 52. a second throttle valve; 53. and a third throttle valve.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only used for convenience in describing the embodiments of the present application and for simplification of description, but 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 embodiments of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
With the rapid development of new energy construction such as domestic wind power, solar energy and the like, the regional power grid structure becomes more and more complex. As is well known, the predictability and controllability of power generation by new energy resources such as wind power, solar energy and the like are relatively poor, and the contribution capacity of primary frequency modulation is limited, so that when the frequency of a power grid fluctuates greatly due to external reasons such as grid connection of high-power users, tripping of high-capacity units and the like, the higher the wind power grid connection load is, the more difficult the power grid adjustment is.
The thermal generator set is a set which uses coal, oil or combustible gas as fuel, heats water in a boiler to raise the temperature, and then uses steam with certain pressure to drive a gas turbine to generate electricity.
The existing thermal generator set adopts a main steam regulating valve pre-throttling technology to perform primary frequency modulation, and as the dead zone of the main steam regulating valve is larger and the system inertia of the thermal generator set is very large, the response of the set during primary frequency modulation is slow, the adjustment precision is low, and the over-modulation condition is easy to generate, the technology is generally used for feeding back insufficient frequency modulation capability and poor frequency modulation operation economy in the actual operation of a power plant; in addition, the newly developed battery frequency modulation is easy to cause fire explosion due to out-of-control thermal load due to the chemical characteristics of the battery, and has great influence on safety production, so that the power plant is seriously concerned when the battery frequency modulation is used.
However, the requirement of users on the quality of electric energy is continuously increased, so how to guarantee the technical indexes of the frequency, the voltage and the like of the power grid while ensuring the rapid development of the power grid becomes an important technical problem.
Meanwhile, due to the rapid development of new energy power generation and the surplus of coal power generation in China, a thermal power generating set operates at low load throughout the year. In order to avoid abandoning light and wind, in the valley power time period, the load of the thermal generator set should be reduced as much as possible due to the consideration of environmental protection and energy conservation, but the thermal generator set needs to operate at the lowest stable combustion load (generally 40% load), and has to operate at the lowest stable combustion load in consideration of the safety and reliability of the set, which causes double losses of environmental protection and energy, and is not in line with the sustainable development of energy.
In order to solve the above problem, the embodiment of the application provides a power generation system and a thermal generator set, store the surplus heat that the turbine set produced in order to store in the fused salt jar through setting up fused salt and releasing the energy system, and simultaneously, through control mend vapour frequency modulation system, thereby through storing the cooperation of energy system with the fused salt, utilize the heat of storage to produce low pressure steam, through low pressure mend vapour bypass and mend vapour governing valve, with mend this low pressure steam into the low pressure jar of steam turbine and do work from communicating pipe, thereby energy storage and primary control response are slow, not accurate enough problem when solving current valley electricity operation, in addition, compare with current power generation system (like thermal generator set's power generation system), not only safe and reliable, and have very good economic effect.
The power generation system according to the embodiment of the present application will be described in detail below with reference to the drawings.
Fig. 1 is a schematic structural diagram of a power generation system according to an embodiment of the present application. Referring to fig. 1, the power generation system of the embodiment of the present application includes a turbine unit 1, a molten salt energy storage and release system 2, a steam supplementing frequency modulation system 3, and a condensate water supply system 4.
The steam turbine unit 1 includes a main steam regulating valve 11, a high-pressure turbine cylinder 12, a medium-pressure turbine cylinder 13, a low-pressure turbine cylinder 14, and a communicating pipe 15, which are connected in this order.
The molten salt energy storage and release system 2 comprises a main steam molten salt heat exchanger 21, a reheat steam molten salt heat exchanger 22, a hot molten salt tank 23, a cold molten salt tank 24 and a molten salt steam heater 25; wherein the content of the first and second substances,
an inlet of the main steam molten salt heat exchanger 21 is connected with the high-pressure turbine cylinder 12, a steam outlet of the main steam molten salt heat exchanger 21 is connected with a steam exhaust port of the high-pressure turbine cylinder 12, and a steam outlet of the main steam molten salt heat exchanger 21 is connected with a steam exhaust port of the high-pressure turbine cylinder 12 and a reheater;
the inlet of the reheat steam molten salt heat exchanger 22 is connected with the turbine intermediate pressure cylinder 13, and the steam outlet of the reheat steam molten salt heat exchanger 22 is connected with the communicating pipe 15;
the inlet of the hot-melt salt tank 23 is connected with the inlet of the main steam molten salt heat exchanger 21, and the outlet of the hot-melt salt tank 23 is connected with the molten salt steam heater 25;
the inlet of the cold molten salt tank 24 is connected with the outlet of the molten salt steam heater 25, and the outlet of the cold molten salt tank 24 is connected with the inlet of the main steam molten salt heat exchanger 21;
the inlet of the fused salt steam heater 25 is connected with the fused salt tank 23, and the outlet of the fused salt steam heater 25 is connected with the communicating pipe 15 through the air supplement regulating valve.
The steam supplementing frequency modulation system 3 comprises a low-pressure steam supplementing bypass 31 and a steam supplementing regulating valve 32, the number of the low-pressure steam supplementing bypass 31 and the number of the steam supplementing regulating valve 32 are at least 2, each regulating valve is correspondingly arranged on each low-pressure steam supplementing bypass 31, and a steam outlet of the molten salt steam heater 25 is connected with the communicating pipe 15 through at least 2 low-pressure steam supplementing bypasses 31.
The condensate water supply system 4 comprises a condenser 41 and a condensate pump 42, an outlet of the steam turbine low pressure cylinder 14 is connected with an inlet of the condenser 41, an outlet of the condenser 41 is connected with an inlet of the molten salt steam heater 25 through the condensate pump 42, and illustratively, the molten salt steam heater 25 needs to heat feedwater into steam in advance and maintain a certain pressure of the steam in the molten salt steam heater 25.
To sum up, the power generation system provided by the embodiment of the present application includes a turbine unit 1, a fused salt energy storage and release system 2, a steam supplementing and frequency modulation system 3 and a condensation water supply system 4, when the power grid needs low or extremely low load operation of the thermal power unit, the boiler still operates according to the lowest stable combustion load, the fused salt energy storage and release system 2 is arranged to store the redundant heat generated by the turbine unit 1 in the fused salt tank, meanwhile, the steam supplementing and frequency modulation system 3 is controlled to generate low-pressure steam by using the stored heat through cooperation with the fused salt energy storage and release system 2, the low-pressure steam is supplemented into the turbine low pressure cylinder 14 through the low-pressure steam supplementing bypass 31 and the steam supplementing and adjusting valve 32, so as to solve the problem that the energy storage and the primary frequency modulation response are slow and not accurate enough when the current valley electricity operates, in addition, compared with the current power generation system (such as the power generation system of the thermal power generator), not only is safe and reliable, but also has good economic effect.
For ease of understanding and description, the throttle valves 5 will be hereinafter designated as first, second and third throttle valves 51, 52 and 53, respectively, illustratively, the first, second and third throttle valves 51, 52 and 53 being located at the inlet of the reheat steam molten salt heat exchanger 22, the inlet of the main steam molten salt heat exchanger 21 and the inlet of the molten salt steam heater 25, respectively.
In practical use, when the load demand of the power grid on the unit is lower than the minimum stable combustion load of the boiler, the energy storage mode is started. Keeping the lowest stable combustion load of the boiler, such as 40% load, in order to continuously reduce the output of the steam turbine set 1, a part of main steam enters the main steam molten salt heat exchanger 21 through the second throttling valve 52, and the rest steam enters the steam turbine high-pressure cylinder 12 to maintain the minimum cooling flow of the steam turbine high-pressure cylinder 12; most of the reheated steam enters the reheated steam molten salt heat exchanger 22 through the first throttle valve 51, and a small amount of steam enters the turbine intermediate pressure cylinder 13 to maintain the minimum cooling flow of the turbine intermediate pressure cylinder 13. The temperature of the reheated steam is greatly reduced but not condensed after passing through the reheated steam molten salt heat exchanger 22, and the outlet steam enters the turbine low pressure cylinder 14 through the communicating pipe 15, so that the minimum volume flow of the turbine low pressure cylinder 14 is maintained. The minimum stable combustion load of 40% is maintained by adjusting the opening of the second throttle valve 52 and the first throttle valve 51, the load of the steam turbine set 1 is 20%, and the surplus heat is stored in the hot-melt salt tank 23.
In order to quickly respond to the primary frequency modulation of the unit, hot salt stored in the hot-melt salt tank 23 is sent to the molten salt steam heater 25 in advance to heat feed water, so that the steam in the molten salt steam heater 25 maintains sufficient pressure.
When the power grid frequency is reduced and the load of the steam turbine unit 1 needs to be increased, steam prestored in the molten salt steam heater 25 sequentially opens the steam supplementing adjusting valves 32, for example, 4 steam supplementing adjusting valves 32 are shown in the figure, after the steam supplementing adjusting valves are opened, the steam turbine low pressure cylinder 14 is supplemented from the communicating pipe 15 to act, and the output of the steam turbine unit 1 is rapidly increased.
When the power grid frequency rises and the load of the steam turbine unit 1 needs to be reduced, the steam supplementing regulating valves 32 are sequentially closed in sequence, when the steam supplementing regulating valves 32 are all closed and the load needs to be reduced, the steam can be led to the heater to heat the molten salt by regulating the opening of the second throttle valve 52, and the inlet flow of the steam turbine unit 1 is reduced, so that the load of the steam turbine unit is reduced.
For the primary frequency modulation control, the load change required by the steam turbine unit 1 is relatively small, conventionally, the rated load change rate is 1.5%/min, therefore, the flow rate required to be supplemented into the low-pressure cylinder is much smaller than that of the main steam regulating valve, therefore, the pipe diameter of the steam supplementing regulating valve 32 is relatively smaller, the flow error is smaller under the condition that the valve regulating error is the same as the dead zone size, meanwhile, the steam supplementing regulating valve 32 adopts a mode that a plurality of steam supplementing regulating valves 32 are opened sequentially, the flow error is further reduced, the regulation is more linear, the precision is improved to the maximum, and theoretically, the more the number of the steam supplementing regulating valves 32 is, the more the regulation is accurate.
Through the design, according to the primary frequency modulation execution specification of the power grid, for example, the unit regulation rate K1 is 1.9, the regulation precision K2 is 1.83, the response time K3 is 1.65, and the comprehensive performance index Kp is K1 × K2 × K3 is 5.737, which are much larger than the average operation value of the current unit.
Continuing to refer to fig. 1, for example, at least 2 low-pressure steam-supplementing bypasses 31 may be arranged in parallel, and by arranging the steam-supplementing bypasses (pipelines) in parallel, the flow rates of each steam-supplementing bypass (pipeline) connected in parallel are equal, so that the stability of the whole primary frequency modulation is ensured on the basis of ensuring the fast response and high accuracy of the primary frequency modulation.
Continuing to refer to fig. 1, exemplarily, each steam-compensating regulating valve 32 may be disposed adjacent to the communicating pipe 15, and the adjacent disposition may specifically be that the distance between each steam-compensating regulating valve 32 and the communicating pipe 15 is 0.1-0.5 m, or of course, may be of other suitable types, such as greater than 0.5m, i.e., 1m, 2m, and the like; thereby reducing the loss of energy in the steam compensation bypass, further ensuring the quick response and high accuracy of primary frequency modulation, and generally ensuring that the closer the distance between the steam compensation regulating valve 32 and the communicating pipe 15 is, the better.
Continuing with fig. 1, the turbine low pressure cylinder 14 may be a double split low pressure cylinder, for example, the steam inlet temperature of the turbine low pressure cylinder 14 is within 400 ℃, so as to perform a two-way control, thereby further ensuring a fast response and high accuracy of the primary frequency modulation.
Continuing with FIG. 1, illustratively, a throttle valve 5 may also be provided at the inlet of the main steam molten salt heat exchanger 21, at the inlet of the reheat steam molten salt heat exchanger 22, and/or at the inlet of the molten salt steam heater 25. The description of the throttle valve 5 is omitted herein for the sake of brevity, as described above.
With reference to fig. 1, a thermal generator set including the power generation system is further provided in an embodiment of the present application. The thermal power generating set comprises a steam turbine set 1, a fused salt energy storage and release system 2, a steam supplementing frequency modulation system 3 and a condensation water supply system 4, when the power grid needs low or extremely low load operation of the thermal power generating set, a boiler still operates according to the lowest stable combustion load, the fused salt energy storage and release system 2 is arranged to store redundant heat generated by the steam turbine set 1 in a fused salt tank, meanwhile, the steam supplementing frequency modulation system 3 is controlled to generate low-pressure steam by utilizing the stored heat through matching with the fused salt energy storage and release system 2, the low-pressure steam is supplemented into a steam turbine low-pressure cylinder 14 through a low-pressure steam supplementing bypass 31 and a steam supplementing adjusting valve 32 from a communicating pipe 15 to do work, so that the problems of slow and inaccurate energy storage and primary frequency modulation response during the operation of the existing valley electricity are solved, and in addition, compared with the existing power generating system (such as the power generating system of the thermal power generating set), not only is safe and reliable, but also has good economic effect.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. A power generation system, comprising:
the steam turbine set (1) comprises a main steam regulating valve (11), a steam turbine high-pressure cylinder (12), a steam turbine medium-pressure cylinder (13), a steam turbine low-pressure cylinder (14) and a communicating pipe (15) which are sequentially connected;
the molten salt energy storage and release system (2) comprises a main steam molten salt heat exchanger (21), a reheat steam molten salt heat exchanger (22), a hot molten salt tank (23), a cold molten salt tank (24) and a molten salt steam heater (25); an inlet of the main steam molten salt heat exchanger (21) is connected with the high-pressure turbine cylinder (12), a steam outlet of the main steam molten salt heat exchanger (21) is connected with a steam outlet of the high-pressure turbine cylinder (12), and a steam outlet of the main steam molten salt heat exchanger (21) is connected with a steam outlet of the high-pressure turbine cylinder (12) and a reheater; the inlet of the reheat steam molten salt heat exchanger (22) is connected with the steam turbine intermediate pressure cylinder (13), and the steam outlet of the reheat steam molten salt heat exchanger (22) is connected with the communicating pipe (15); the inlet of the hot-melt salt tank (23) is connected with the inlet of the main steam molten salt heat exchanger (21), and the outlet of the hot-melt salt tank (23) is connected with the molten salt steam heater (25); the inlet of the cold molten salt tank (24) is connected with the outlet of the molten salt steam heater (25), and the outlet of the cold molten salt tank (24) is connected with the inlet of the main steam molten salt heat exchanger (21); the inlet of the molten salt steam heater (25) is connected with the hot-melt salt tank (23), and the outlet of the molten salt steam heater (25) is connected with the communicating pipe (15) through an air supply regulating valve;
the steam supplementing and frequency modulating system (3) comprises low-pressure steam supplementing bypasses (31) and steam supplementing regulating valves (32), the number of the low-pressure steam supplementing bypasses (31) and the number of the steam supplementing regulating valves (32) are at least 2, at least 2 steam supplementing regulating valves (32) are correspondingly arranged on each low-pressure steam supplementing bypass (31), and steam outlets of the molten salt steam heater (25) are connected with the communicating pipe (15) through at least 2 low-pressure steam supplementing bypasses (31);
the condensation water supply system (4), the condensation water supply system (4) includes condenser (41) and condensate pump (42), the export of steam turbine low pressure cylinder (14) with the entry linkage of condenser (41), the export of condenser (41) is passed through condensate pump (42) with the entry linkage of fused salt steam heater (25).
2. The power generation system according to claim 1, wherein at least 2 of the low-pressure steam make-up bypasses (31) are arranged in parallel.
3. The power generation system according to claim 1, wherein each of the steam replenishment regulating valves (32) is provided adjacent to the communicating pipe (15).
4. A power generation system according to claim 1, characterized in that the turbine low pressure cylinder (14) is a double split low pressure cylinder.
5. The power generation system according to claim 1, characterized in that a throttle valve (5) is further provided at the inlet of the main steam molten salt heat exchanger (21), at the inlet of the reheat steam molten salt heat exchanger (22), and/or at the inlet of the molten salt steam heater (25).
6. A thermal generator set comprises a power generation system and is characterized in that: the power generation system is the power generation system of any one of claims 1 to 5.
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| CN114718664A (en) * | 2022-04-07 | 2022-07-08 | 西安热工研究院有限公司 | Low-pressure cylinder cooling steam flow accurate adjusting system and control method thereof |
| CN114961908A (en) * | 2022-06-07 | 2022-08-30 | 华能国际电力股份有限公司 | Solar coal-fired coupling power generation system and method |
| WO2024037027A1 (en) * | 2022-08-17 | 2024-02-22 | 西安热工研究院有限公司 | Solar-coal hybrid steam turbine system based on cascade utilization of energy, and power generation system |
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