CN114109545A - Peak shaving system and peak shaving method for recycling waste heat of cold end of thermal power plant - Google Patents
Peak shaving system and peak shaving method for recycling waste heat of cold end of thermal power plant Download PDFInfo
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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Abstract
The invention discloses a peak regulation system and a peak regulation method for recovering waste heat of a cold end of a thermal power plant.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and relates to a peak shaving system and a peak shaving method for recovering waste heat at a cold end of a thermal power plant.
Background
In recent years, the development of wind power and solar power generation is rapid in China. By the end of 7 months in 2021, the total installed capacity of the national power generation reaches 22.7 hundred million kilowatts, wherein the installed capacity of the wind power generation is 2.9 hundred million and 34.4 percent on a par, and the installed capacity of the solar power generation is 2.7 hundred million kilowatts and 23.6 percent on a par. With the further increase of the scale of wind power and solar power generation installed machines, the electric power industry of China will gradually change to a novel electric power system mainly based on clean energy power generation in the future.
Due to the characteristics of fluctuation, intermittency, regional limitation and the like of wind energy and solar energy, the grid connection of wind power and photovoltaic power generation can bring great challenges to the safe and stable operation of a power grid. In order to stabilize the fluctuation of wind power and photovoltaic power generation and further absorb large-scale high-proportion new energy power generation, the operation regulation capacity of a power system needs to be improved, for example, peak shaving power stations such as pumped storage and natural gas power generation are built, coal-electricity flexibility transformation is carried out, or technologies such as compressed air energy storage and battery energy storage are adopted. The battery energy storage is the highest in efficiency but is too high in cost; the compressed air energy storage and pumped storage power station is limited by geological conditions and is difficult to popularize on a large scale; the cost of natural gas power generation is also high. The coal-electricity flexible transformation becomes one of the most effective technologies for improving the operation regulation capability of the power system at present, and the deep excavation of the peak regulation potential of the existing coal-fired unit is one of the keys for ensuring the safety and stability of energy and electricity.
The steam turbine exhaust can release a large amount of low-temperature heat to the outside in the operation process of the coal-fired unit, so that great energy loss is caused, and the low-temperature heat can be converted into high-temperature heat by the heat pump circulation through consuming high-quality energy, so that the low-temperature heat can be recycled, and the high-temperature heat economical efficiency is realized. The hot water storage technology is one of the mature heat storage technologies in the prior art, has high safety and low investment and operation cost, and can be widely applied to thermal power plants. Therefore, heat pump circulation and hot water storage technologies can be considered to realize the recycling of the waste heat at the cold end of the coal-fired unit, but similar disclosures are not given in the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a peak shaving system and a peak shaving method for recovering waste heat at the cold end of a thermal power plant, and the system and the method can reduce heat loss at the cold end of a unit.
In order to achieve the purpose, the peak shaving system for recovering the waste heat of the cold end of the thermal power plant comprises a deaerator, a condenser, a low-pressure heater, a steam turbine exhaust pipeline, a steam turbine exhaust bypass regulating valve, a water/steam-carbon dioxide heat exchanger, a heat regenerator, a carbon dioxide-water heat exchanger, a condensed water regulating valve, a condensed water bypass regulating valve, a deaerator water feeding bypass regulating valve, a cold tank and a hot tank;
the carbon dioxide side outlet of the water/steam-carbon dioxide heat exchanger is communicated with the cold side inlet of the heat regenerator, the cold side outlet of the heat regenerator is communicated with the carbon dioxide side inlet of the carbon dioxide-water heat exchanger, the carbon dioxide side outlet of the carbon dioxide-water heat exchanger is communicated with the hot side inlet of the heat regenerator, and the hot side outlet of the heat regenerator is communicated with the carbon dioxide side inlet of the water/steam-carbon dioxide heat exchanger;
the outlet of the condenser is divided into two paths, wherein one path is communicated with the inlet of the low-pressure heater through a condensed water regulating valve, and the other path is communicated with the inlet of the cold tank through a condensed water bypass regulating valve; the outlet of the low-pressure heater is divided into two paths, wherein one path is communicated with the deaerator through a deaerator water-feeding regulating valve, and the other path is communicated with the inlet of the cold tank through a deaerator water-feeding bypass regulating valve; the outlet of the cold tank is communicated with the water side inlet of the carbon dioxide-water heat exchanger, the water side outlet of the carbon dioxide-water heat exchanger is communicated with the inlet of the hot tank, and the outlet of the hot tank is communicated with the deaerator;
the outlet of the steam turbine exhaust pipeline is divided into two paths, wherein one path is communicated with the condenser, the other path is communicated with the water/steam side inlet of the water/steam-carbon dioxide heat exchanger through a steam turbine exhaust bypass regulating valve, and the water/steam side outlet of the water/steam-carbon dioxide heat exchanger is communicated with the condenser.
The device also comprises a compressor; the outlet of the cold side of the heat regenerator is communicated with the inlet of the compressor; the outlet of the compressor is communicated with the carbon dioxide side inlet of the carbon dioxide-water heat exchanger.
Also includes a motor; the output shaft of the motor is connected to the drive shaft of the compressor.
The outlet of the cooling tank is communicated with the water side inlet of the carbon dioxide-water heat exchanger through a first water pump and a first regulating valve in sequence.
The water side outlet of the carbon dioxide-water heat exchanger is communicated with the inlet of the hot tank through the electric boiler.
The outlet of the hot tank is communicated with the deaerator through a second water pump and a second regulating valve in sequence.
The hot side outlet of the regenerator is communicated with the carbon dioxide side inlet of the water/steam-carbon dioxide heat exchanger through a throttle valve.
The outlet of the condenser is divided into two paths by a condensate pump.
The peak shaving method for recovering the cold end waste heat of the thermal power plant comprises the following steps:
when the power grid dispatching load is reduced, the opening degree of a condensate water regulating valve is increased or the rotating speed of a condensate pump is increased so as to increase the flow of condensate water entering a low-pressure heater, increase the steam extraction amount of a low-pressure cylinder synchronously and reduce the power generation power of the low-pressure cylinder; opening a water supply bypass regulating valve of the deaerator, and shunting part of condensed water output by the low-pressure heater into the cold tank; after the generating power of the unit is reduced, opening a condensed water bypass regulating valve, and recycling part of condensed water to a cooling tank; the condensed water in the cold tank is conveyed to the water side of the carbon dioxide-water heat exchanger to absorb the high-temperature heat of the carbon dioxide in the heat pump cycle, and then the condensed water enters the electric boiler to be heated and stored in the hot tank; at the moment, the electricity of the motor and the electric boiler is surplus electricity generated by photovoltaic and wind power or electricity generated by the generator set;
when the dispatching load of the power grid rises, the opening of a condensed water regulating valve is reduced or the rotating speed of a condensed water pump is reduced, the flow of condensed water entering a low-pressure heater is reduced, the steam extraction amount of a low-pressure cylinder is synchronously reduced, the power generation power of the low-pressure cylinder is improved, and in order to maintain the water level and the water supply flow of a deaerator, high-temperature hot water in a hot tank is sent into the deaerator; in order to maintain the water level of the condenser, a condensed water bypass regulating valve is opened, and part of condensed water is distributed to a cold tank for storage.
The invention has the following beneficial effects:
when the peak shaving system and the peak shaving method for recovering the waste heat at the cold end of the thermal power plant are specifically operated, the heat pump circulation is adopted to improve the quality of a large amount of low-temperature heat released by the exhaust steam of the steam turbine of the thermal power plant and recover the low-temperature heat so as to reduce the heat loss at the cold end of the unit; meanwhile, a storage tank is arranged in a turbine regenerative system by combining a hot water storage technology, and heat recovered by a cold end is absorbed and released in the process that the unit needs peak shaving operation, so that the AGC response capacity and the climbing speed of the coal-fired unit are greatly improved, the investment cost is low, and the technical maturity is high. In addition, the electricity consumption of the compressor and the electric boiler adopts redundant electricity generated by photovoltaic and wind power or electricity generated by the unit, so that the electricity entering a power grid is reduced, the deep peak regulation capacity of the unit is improved, and the consumption of new energy can be effectively promoted.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a steam turbine exhaust bypass regulating valve, 2 is a water/steam-carbon dioxide heat exchanger, 3 is a heat regenerator, 4 is a compressor, 5 is a motor, 6 is a carbon dioxide-water heat exchanger, 7 is a throttle valve, 8 is a condensed water regulating valve, 9 is a condensed water bypass regulating valve, 10 is a deaerator water feeding regulating valve, 11 is a deaerator water feeding bypass regulating valve, 12 is a cold tank, 13 is a first water pump, 14 is a first regulating valve, 15 is an electric boiler, 16 is a hot tank, 17 is a second water pump, and 18 is a second regulating valve.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. 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 disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the peak shaving system for recovering waste heat at the cold end of a thermal power plant according to the present invention includes a steam turbine exhaust bypass regulating valve 1, a water/steam-carbon dioxide heat exchanger 2, a heat regenerator 3, a compressor 4, a motor 5, a carbon dioxide-water heat exchanger 6, a throttle valve 7, a condensed water regulating valve 8, a condensed water bypass regulating valve 9, a deaerator water supply regulating valve 10, a deaerator water supply bypass regulating valve 11, a cold tank 12, a first water pump 13, a first regulating valve 14, an electric boiler 15, a hot tank 16, a second water pump 17, and a second regulating valve 18;
a carbon dioxide side outlet of the water/steam-carbon dioxide heat exchanger 2 is communicated with a cold side inlet of the heat regenerator 3, and a cold side outlet of the heat regenerator 3 is communicated with an inlet of the compressor 4; an output shaft of the motor 5 is connected with a driving shaft of the compressor 4, an outlet of the compressor 4 is communicated with a carbon dioxide side inlet of the carbon dioxide-water heat exchanger 6, a carbon dioxide side outlet of the carbon dioxide-water heat exchanger 6 is communicated with a hot side inlet of the heat regenerator 3, and a hot side outlet of the heat regenerator 3 is communicated with a carbon dioxide side inlet of the water/steam-carbon dioxide heat exchanger 2 through a throttle valve 7;
the outlet of the condenser is divided into two paths by a condensate pump, wherein one path is communicated with the inlet of the low-pressure heater by a condensate regulating valve 8, and the other path is communicated with the inlet of a cold tank 12 by a condensate bypass regulating valve 9; the outlet of the low-pressure heater is divided into two paths, wherein one path is communicated with the deaerator through a deaerator water-feeding regulating valve 10, and the other path is communicated with the inlet of the cold tank 12 through a deaerator water-feeding bypass regulating valve 11; the outlet of the cold tank 12 is communicated with the water side inlet of the carbon dioxide-water heat exchanger 6 through a first water pump 13 and a first regulating valve 14 in sequence, the water side outlet of the carbon dioxide-water heat exchanger 6 is communicated with the inlet of the hot tank 16 through an electric boiler 15, and the outlet of the hot tank 16 is communicated with a deaerator through a second water pump 17 and a second regulating valve 18 in sequence.
The outlet of the steam turbine exhaust pipeline is divided into two paths, wherein one path is communicated with the condenser, the other path is communicated with the water/steam side inlet of the water/steam-carbon dioxide heat exchanger 2 through the steam turbine exhaust bypass regulating valve 1, and the water/steam side outlet of the water/steam-carbon dioxide heat exchanger 2 is communicated with the condenser.
The circulating working medium of the heat pump adopts carbon dioxide.
The peak shaving method for recovering the waste heat of the cold end of the thermal power plant comprises the following steps of:
the operation process of the heat pump circulation system for recovering the waste heat at the cold end of the unit comprises the following steps:
the exhaust steam of the steam turbine is divided into two parts, wherein one part of the exhaust steam directly enters a condenser for heat release and condensation; the other part of the exhaust steam enters the water/steam side of the water/steam-carbon dioxide heat exchanger 2 through the steam turbine exhaust bypass regulating valve 1 to release heat and reduce the temperature, and the exhaust steam after releasing heat and reducing the temperature is condensed into liquid and then enters the condenser; wherein, the exhaust steam flow entering the water/steam-carbon dioxide heat exchanger 2 is controlled by the steam turbine exhaust bypass regulating valve 1, and further the recovered heat is controlled.
The carbon dioxide after being depressurized and cooled by the throttle valve 7 enters a two-phase region, the carbon dioxide in a two-phase state enters the carbon dioxide side of the water/steam-carbon dioxide heat exchanger 2 to absorb low-grade heat of steam exhausted by the steam turbine, the carbon dioxide saturated gas after heat absorption enters the compressor 4 after heat absorption and temperature rise by the cold side of the heat regenerator 3 to be pressurized, then enters the carbon dioxide side of the carbon dioxide-water heat exchanger 6 to heat condensed water, finally enters the throttle valve 7 again after heat release and temperature reduction by the hot side of the heat regenerator 3 to be depressurized and cooled so as to finish heat pump cycle recovery of cold end waste heat.
When the power grid dispatching load is reduced, in order to quickly reduce the generating power of the unit, the opening of the condensed water regulating valve 8 is increased or the rotating speed of a condensed water pump is increased, so that the flow of the condensed water entering the low-pressure heater is increased, the steam extraction amount of the low-pressure cylinder is synchronously increased, and the generating power of the low-pressure cylinder is reduced; in order to maintain the water level and the water supply flow of the deaerator, a water supply bypass regulating valve 11 of the deaerator is opened, and the condensed water output by the low-pressure heater is partially split into a cold tank 12; after the generating power of the unit is reduced, the steam flow of the steam turbine is reduced, the water supply and condensate flow of the heat recovery system are correspondingly reduced, the condensate bypass regulating valve 9 is opened, and part of condensate is recycled to the cooling tank 12; the condensed water in the cold tank 12 is conveyed to the water side of the carbon dioxide-water heat exchanger 6 through a first water pump 13 and a first regulating valve 14 to absorb the high-temperature heat of the carbon dioxide in the heat pump cycle, and then the condensed water is heated in an electric boiler 15 and stored in a hot tank 16; at the moment, the heat pump operates circularly to recover the waste heat at the cold end, the electricity of the motor 5 and the electric boiler 15 comes from the redundant electricity generated by photovoltaic and wind power or the electricity generated by the unit per se so as to reduce the electricity entering the power grid, the second water pump 17 stops operating, and the second regulating valve 18 is closed.
When the dispatching load of the power grid rises, in order to quickly improve the generating power of the unit, reduce the opening degree of a condensed water regulating valve 8 or reduce the rotating speed of a condensed water pump, reduce the flow rate of condensed water entering a low-pressure heater, synchronously reduce the steam extraction amount of a low-pressure cylinder and improve the generating power of the low-pressure cylinder, and in order to maintain the water level and the water supply flow of a deaerator, high-temperature hot water in a hot tank 16 is sent into the deaerator through a second water pump 17 and a second regulating valve 18; in order to maintain the water level of the condenser, the condensed water bypass regulating valve 9 is properly opened, and part of condensed water is distributed to the cold tank 12 for storage; at this time, the heat pump cycle and the electric boiler 15 are not operated, the first water pump 13 is stopped, and the first regulating valve 14 is closed.
However, the other layout of the heat pump cycle shown in fig. 1 does not affect the application of the present invention, and the content of the present invention is also applicable to other layout of the heat pump cycle, so the heat pump cycle in the present invention is a heat pump cycle in a broad sense, and is not limited to the illustrated layout. For example, other heat pump cycles do not use the heat regenerator 3, and the working medium can also use air or other refrigerants.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A peak shaving system for recovering waste heat of a cold end of a thermal power plant is characterized by comprising a deaerator, a condenser, a low-pressure heater, a steam turbine exhaust pipeline, a steam turbine exhaust bypass regulating valve (1), a water/steam-carbon dioxide heat exchanger (2), a heat regenerator (3), a carbon dioxide-water heat exchanger (6), a condensed water regulating valve (8), a condensed water bypass regulating valve (9), a deaerator water feeding regulating valve (10), a deaerator water feeding bypass regulating valve (11), a cold tank (12) and a hot tank (16);
a carbon dioxide side outlet of the water/steam-carbon dioxide heat exchanger (2) is communicated with a cold side inlet of the heat regenerator (3), a cold side outlet of the heat regenerator (3) is communicated with a carbon dioxide side inlet of the carbon dioxide-water heat exchanger (6), a carbon dioxide side outlet of the carbon dioxide-water heat exchanger (6) is communicated with a hot side inlet of the heat regenerator (3), and a hot side outlet of the heat regenerator (3) is communicated with a carbon dioxide side inlet of the water/steam-carbon dioxide heat exchanger (2);
the outlet of the condenser is divided into two paths, wherein one path is communicated with the inlet of the low-pressure heater through a condensed water regulating valve (8), and the other path is communicated with the inlet of the cold tank (12) through a condensed water bypass regulating valve (9); the outlet of the low-pressure heater is divided into two paths, wherein one path is communicated with the deaerator through a deaerator water-feeding regulating valve (10), and the other path is communicated with the inlet of the cold tank (12) through a deaerator water-feeding bypass regulating valve (11); an outlet of the cold tank (12) is communicated with a water side inlet of the carbon dioxide-water heat exchanger (6), a water side outlet of the carbon dioxide-water heat exchanger (6) is communicated with an inlet of the hot tank (16), and an outlet of the hot tank (16) is communicated with a deaerator;
the outlet of the steam turbine exhaust pipeline is divided into two paths, wherein one path is communicated with the condenser, the other path is communicated with the water/steam side inlet of the water/steam-carbon dioxide heat exchanger (2) through the steam turbine exhaust bypass regulating valve (1), and the water/steam side outlet of the water/steam-carbon dioxide heat exchanger (2) is communicated with the condenser.
2. The peak shaving system for recovering waste heat at the cold end of a thermal power plant according to claim 1, further comprising a compressor (4); the outlet of the cold side of the heat regenerator (3) is communicated with the inlet of the compressor (4); the outlet of the compressor (4) is communicated with the carbon dioxide side inlet of the carbon dioxide-water heat exchanger (6).
3. A peaking system for recovering cold end waste heat of a thermal power plant according to claim 2, further comprising an electric motor (5); the output shaft of the motor (5) is connected with the driving shaft of the compressor (4).
4. The peak shaving system for recovering waste heat at the cold end of the thermal power plant as claimed in claim 1, wherein the outlet of the cold tank (12) is communicated with the water side inlet of the carbon dioxide-water heat exchanger (6) through a first water pump (13) and a first regulating valve (14) in sequence.
5. The peak shaving system for recovering waste heat at the cold end of a thermal power plant as claimed in claim 1, wherein the water side outlet of the carbon dioxide-water heat exchanger (6) is communicated with the inlet of the hot tank (16) through an electric boiler (15).
6. The peak shaving system for recovering the waste heat at the cold end of the thermal power plant as claimed in claim 1, wherein the outlet of the thermal tank (16) is communicated with the deaerator through a second water pump (17) and a second regulating valve (18) in sequence.
7. The peak shaving system for recovering waste heat at the cold end of the thermal power plant according to claim 1, wherein the hot side outlet of the heat regenerator (3) is communicated with the carbon dioxide side inlet of the water/steam-carbon dioxide heat exchanger (2) through a throttle valve (7).
8. The peak shaving system for recovering waste heat at the cold end of the thermal power plant as claimed in claim 1, wherein the outlet of the condenser is divided into two paths by a condensate pump.
9. A peak shaving method for recovering waste heat at a cold end of a thermal power plant, characterized in that the peak shaving system for recovering waste heat at the cold end of the thermal power plant based on claim 1 comprises:
when the power grid dispatching load is reduced, the opening degree of a condensate water regulating valve (8) is increased or the rotating speed of a condensate pump is increased so as to increase the flow of condensate water entering a low-pressure heater, increase the steam extraction amount of a low-pressure cylinder synchronously and reduce the power generation power of the low-pressure cylinder; opening a water feeding bypass regulating valve (11) of the deaerator, and shunting part of condensed water output by the low-pressure heater into a cold tank (12); after the generating power of the unit is reduced, the condensed water bypass regulating valve (9) is opened, and part of condensed water is recycled to the cooling tank (12); the condensed water in the cold tank (12) is conveyed to the water side of the carbon dioxide-water heat exchanger (6) to absorb the high-temperature heat of the carbon dioxide in the heat pump cycle, and then enters the electric boiler (15) to be heated and stored in the hot tank (16); at the moment, the electricity of the motor (5) and the electric boiler (15) comes from surplus electricity generated by photovoltaic and wind power or electricity generated by the unit;
when the dispatching load of the power grid rises, the opening degree of a condensed water regulating valve (8) is reduced or the rotating speed of a condensed water pump is reduced, the flow of condensed water entering a low-pressure heater is reduced, the steam extraction quantity of a low-pressure cylinder is synchronously reduced, the power generation power of the low-pressure cylinder is improved, and in order to maintain the water level and the water supply flow of a deaerator, high-temperature hot water in a hot tank (16) is fed into the deaerator; in order to maintain the water level of the condenser, a condensed water bypass regulating valve (9) is opened, and part of condensed water is distributed to a cold tank (12) for storage.
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| CN115234318A (en) * | 2022-09-22 | 2022-10-25 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system matched with thermal power plant deep peak shaving and control method thereof |
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