CN115075901B - Energy storage power generation system for thermal power plants - Google Patents
Energy storage power generation system for thermal power plants Download PDFInfo
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- CN115075901B CN115075901B CN202210834535.3A CN202210834535A CN115075901B CN 115075901 B CN115075901 B CN 115075901B CN 202210834535 A CN202210834535 A CN 202210834535A CN 115075901 B CN115075901 B CN 115075901B
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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
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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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
- F01K7/22—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 the turbines having inter-stage steam heating
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/16—Steam superheating characterised by heating method by using a separate heat source independent from heat supply of the steam boiler, e.g. by electricity, by auxiliary combustion of fuel oil
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Water Supply & Treatment (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
一种用于火电厂的储能发电系统，包括：发电系统和第一级释热机构。发电系统包括：加热锅炉、汽轮机高压缸和发电机，所述加热锅炉包括：炉膛、汽包、连通所述汽包和所述炉膛底部的下降管，以及再热器和过热器；第一级释热机构，用于加热冷再热蒸汽，所述第一级释热机构在用电高峰期代替部分所述再热器位置所需热能，提高机组顶负荷能力。通过上述结构可以有效地解决现有技术中的火电厂在用电低谷期热能存储效率不足，且无法实现深度调峰的问题。
A power generation system for thermal power plants, comprising: a power generation system and a first-stage heat release mechanism. The power generation system comprises: a heating boiler, a high-pressure cylinder of a steam turbine and a generator, wherein the heating boiler comprises: a furnace, a steam drum, a downcomer connecting the steam drum and the bottom of the furnace, and a reheater and a superheater; the first-stage heat release mechanism is used to heat cold reheat steam, wherein the first-stage heat release mechanism replaces part of the heat energy required at the reheater position during peak power consumption to improve the top load capacity of the unit. The above structure can effectively solve the problem of insufficient thermal energy storage efficiency and inability to achieve deep peak regulation in thermal power plants in the prior art during low power consumption periods.
Description
Technical Field
The invention relates to the technical field of energy storage power generation systems of thermal power plants, in particular to an energy storage power generation system for a thermal power plant and a system thereof.
Background
A thermal power plant is a thermal power plant for short, and is a plant that produces electric energy by using combustible materials such as coal as fuel. The basic production process is that the fuel heats water to generate steam when burning, the chemical energy of the fuel is converted into heat energy, the steam pressure pushes the turbine to rotate, the heat energy is converted into mechanical energy, and then the turbine drives the generator to rotate, and the mechanical energy is converted into electric energy. Thermal power generation is the main force army of modern society electric power development, but thermal power generation is in the electricity consumption low valley period, causes the problem of energy waste easily, how to store the unnecessary heat energy that the thermal power plant produced effectively in the electricity consumption low valley period to realize letting the thermal power plant operate steadily in the electricity consumption low valley period, realize degree of depth peak shaving, be the technical problem that the urgent needs of the technical staff of this field to solve.
Disclosure of Invention
The invention aims to provide an energy storage power generation system and system for a thermal power plant, which are used for solving the problems that the thermal power plant in the prior art is insufficient in heat energy storage efficiency in the electricity consumption valley period and cannot realize deep peak shaving. To this end, the present invention provides an energy storage power generation system for a thermal power plant, comprising:
The power generation system comprises a heating boiler, a steam turbine high-pressure cylinder and a generator, wherein the heating boiler comprises a hearth, a steam drum, a down pipe communicated with the steam drum and the bottom of the hearth, and a reheater and a superheater; the water supply enters a steam drum of the heating boiler, the water working medium descends to the bottom of a hearth along the descending pipe, the water working medium absorbs heat energy in the hearth and evaporates to a steam-water mixture, the steam-water mixture ascends back to the steam drum, and then flows out of the steam drum and enters main steam with high temperature and high pressure further absorbed by the superheater;
and the first-stage heat release mechanism is used for heating cold reheat steam, and replaces part of heat energy required by the reheater position in the electricity utilization peak period, so that the top load capacity of the unit is improved.
Optionally, the power generation system further comprises a turbine intermediate pressure cylinder and a turbine low pressure cylinder;
The hot reheat steam obtained by absorbing heat in the reheater sequentially flows into the medium pressure cylinder of the steam turbine and the low pressure cylinder of the steam turbine to do expansion work, and the high, medium and low pressure cylinders of the steam turbine are coaxially connected.
Optionally, the first-stage heat release mechanism comprises a packed bed high-temperature heat storage unit and a first-stage heat release exchanger;
Simultaneously, cold reheat steam flows out from the outlet position of the high-pressure cylinder of the steam turbine, the cold reheat steam enters the second passage of the first-stage heat release heat exchanger to absorb heat energy to a hot reheat steam state, returns to a hot reheat steam main pipeline along the pipeline, and acts on the medium-pressure cylinder of the steam turbine.
Optionally, a first regulating valve for controlling the outflow of the cold reheat steam is arranged on a pipeline at the outlet position of the high pressure cylinder of the steam turbine.
Optionally, the power generation system further comprises a high-pressure heater assembly, a deaerator, a small water pump turbine and a low-pressure heater assembly;
extracting steam from the interstage of the high-pressure cylinder of the steam turbine and the intermediate-pressure cylinder of the steam turbine, and respectively providing the steam for heating the high-pressure heater assembly and the deaerator and providing steam for a small steam turbine of a feed pump;
steam is extracted from the low pressure cylinder interstage of the steam turbine and provided to a low pressure heater assembly.
Optionally, the power generation system also comprises a condenser and a condensate polishing device;
The condenser condenses the exhaust steam from the low pressure cylinder 10 of the steam turbine into condensed water, and the condensed water is collected in a hot well, and the condensed water in the hot well is conveyed to a condensed water fine treatment device, and the exhaust steam of the small steam turbine of the feed pump is introduced into the condenser.
The high-pressure heater component is provided with a built-in steam cooling section and a built-in drain cooling section, and the low-pressure heater component is internally provided with a built-in drain cooling section;
The high-pressure heater drainage method of the high-pressure heater assembly automatically flows into the deaerator in a step-by-step self-flowing mode, the low-pressure heater drainage method of the low-pressure heater assembly automatically flows in a step-by-step self-flowing mode, the low-pressure heater drainage method is combined with the shaft seal heater drainage mode, and then flows into a condenser hot well of the condenser, and a steam source of the shaft seal heater is shaft seal steam of the steam turbine.
Optionally, the condensate in the condenser hot well sequentially passes through a condensate pump, a condensate polishing device, a shaft seal heater and the low-pressure heater assembly and then enters the deaerator;
The deoxidized water passing through the deoxidizer enters a steam drum of the heating boiler from a deoxidizer water supply tank through a pre-pump, a main water supply pump and the high-pressure heater component.
Optionally, the high pressure heater assembly includes a first stage high pressure heater, a second stage high pressure heater, and a third stage high pressure heater, and/or,
The low pressure heater assembly comprises a first stage low pressure heater, a second stage low pressure heater, a third stage low pressure heater and a fourth stage low pressure heater.
Optionally, the energy storage power generation system for the thermal power plant further includes:
The second-stage heat release mechanism comprises a feed water heater, a main feed water pump and a steam generator, wherein a gas working medium flowing out of a first passage of the first-stage heat release heat exchanger enters a heating feed water passage and/or a heating deoxidized water passage through a first three-way valve;
Simultaneously, a strand of water supply is led out after the main water supply pump, the second passage of the water supply heater absorbs heat energy and then is combined with a water supply main pipeline and enters a steam drum of the heating boiler so as to reduce the extraction amount of a high-pressure cylinder of a steam turbine and a medium-pressure cylinder of the steam turbine and provide a part of heat energy required by the high-pressure heater assembly, and/or,
Meanwhile, a stream of deoxygenated water is led out from the outlet position of the deoxygenator, the deoxygenated water is driven to flow into the second passage of the steam generator to absorb heat energy to a superheated steam state, and the obtained superheated steam flows to the low-pressure cylinder of the steam turbine and enters the low-pressure cylinder of the steam turbine to expand and work after being mixed with the exhaust steam of the medium-pressure cylinder of the steam turbine so as to improve the work load of the low-pressure cylinder of the steam turbine in the peak period of electricity consumption.
Optionally, the energy storage power generation system for the thermal power plant further includes:
the third-stage heat release mechanism comprises a condensate water heater and a heat supply heat exchanger, wherein after the first passage of the steam generator and the gas working medium flowing out of the feed water heater are converged, the gas working medium is controlled by a second three-way valve to enter a heating condensate water passage and/or a heating passage respectively;
the first passage of the steam generator and the gas working medium flowing out of the feed water heater are converged, heat energy is released from the first passage of the condensate water heater 31 by the heating condensate water passage, meanwhile, partial condensate water is led out from the condensate water finishing device, enters the second passage of the condensate water heater to absorb heat energy, then enters the deaerator along a pipeline to reduce the steam extraction amount of the low-pressure cylinder of the steam turbine and replace part of heat energy required by the low-pressure heater assembly, and/or,
And simultaneously, the water working medium in the thermodynamic system is driven to enter the second passage of the heat supply heat exchanger to absorb heat energy, and the heated water working medium is driven to be moved to the side of a heat user.
Optionally, the water feeding amount led out by the main water feeding pump is controlled by a second regulating valve 33, and/or the condensate amount led into the second passage of the condensate water heater by the condensate water fine treatment device is controlled by a third regulating valve.
Optionally, the energy storage power generation system for the thermal power plant further includes:
the heat storage subsystem comprises a packed bed high-temperature heat storage unit and an induced draft fan;
In the electricity consumption valley period, high-temperature flue gas in a furnace chamber of the heating boiler enters the packed bed high-temperature heat storage unit, the high-temperature flue gas exchanges heat with a solid heat storage material in the packed bed high-temperature heat storage unit, heat energy is stored in the solid heat storage material, and gas after heat energy release is transferred back to the heating boiler by the induced draft fan and is converged with flue gas in the heating boiler, and then enters a dust remover for dust removal.
The technical scheme of the invention has the following advantages:
1. The invention provides an energy storage power generation system for a thermal power plant, which comprises:
The power generation system comprises a heating boiler, a steam turbine high-pressure cylinder and a generator, wherein the heating boiler comprises a hearth, a steam drum, a down pipe communicated with the steam drum and the bottom of the hearth, and a reheater and a superheater; the water supply enters a steam drum of the heating boiler, the water working medium descends to the bottom of a hearth along the descending pipe, the water working medium absorbs heat energy in the hearth and evaporates to a steam-water mixture, the steam-water mixture ascends back to the steam drum, and then flows out of the steam drum and enters the superheater to further absorb heat to main steam with high temperature and high pressure;
and the first-stage heat release mechanism is used for heating cold reheat steam, and replaces part of heat energy required by the reheater position in the electricity utilization peak period, so that the top load capacity of the unit is improved.
In the invention, the power generation system generates high-temperature and high-pressure main steam through the heating boiler, and the power generation function of the thermal power plant can be effectively realized through the power generation of the generator. In addition, in order to improve the heat energy storage efficiency of the thermal power plant in the electricity consumption valley period, and realize deep peak shaving. According to the first-stage heat release mechanism, the heat energy released by the thermal power plant in the electricity consumption valley period is stored through the packed bed high-temperature heat storage unit, and the heat energy required by part of reheater positions is replaced in the electricity consumption peak period of the thermal power plant, so that cold reheat steam is heated, and the top load capacity of a unit is improved.
2. The energy storage power generation system for the thermal power plant further comprises a turbine intermediate pressure cylinder and a turbine low pressure cylinder, the hot reheat steam obtained by absorbing heat in the reheater flows into the turbine intermediate pressure cylinder and the turbine low pressure cylinder in sequence to do expansion work, and the turbine high, intermediate and low pressure cylinders are coaxially connected.
According to the invention, the heat reheat steam obtained by absorbing heat in the reheater flows into the turbine intermediate pressure cylinder and the turbine low pressure cylinder in sequence to perform expansion work, so that the energy conversion efficiency of the thermal power plant can be effectively improved.
3. The energy storage power generation system for the thermal power plant further comprises a high-pressure heater assembly, a deaerator, a small water pump turbine and a low-pressure heater assembly, wherein steam is extracted from the high-pressure cylinder of the turbine and the intermediate-pressure cylinder of the turbine, and is respectively supplied to the high-pressure heater assembly, heating steam of the deaerator and steam supplied by the small water pump turbine, and steam is extracted from the intermediate-pressure cylinder of the turbine and is supplied to the low-pressure heater assembly.
The high-pressure heater assembly, the deaerator and the small water-feeding pump turbine can supply hot steam through the high-pressure cylinder and the medium-pressure cylinder of the turbine, and the low-pressure heater assembly can supply hot steam through the low-pressure cylinder of the turbine. The self-circulation of the energy storage power generation system can be effectively realized by the arrangement, and the energy utilization efficiency is improved.
4. The invention provides an energy storage power generation system for a thermal power plant, which further comprises a condenser and a condensate polishing device, wherein the condenser condenses exhaust steam from a low-pressure cylinder 10 of a steam turbine into condensate and collects the condensate into a hot well, the condensate in the hot well is conveyed to the condensate polishing device, and exhaust steam of a small steam turbine of a feed pump is introduced into the condenser. The condensate water in the condenser hot well sequentially passes through the condensate pump, the condensate water fine treatment device, the shaft seal heater and the low-pressure heater component and then enters the deaerator, and the deaerated water passing through the deaerator enters the steam drum of the heating boiler after passing through the deaerator water supply tank, the front-mounted pump, the main water supply pump and the high-pressure heater component.
According to the invention, the condenser and the condensate water fine treatment device can be used for effectively obtaining condensate water, so that the condensate water participates in the heat circulation of the energy storage power generation system.
5. The invention provides an energy storage power generation system for a thermal power plant, wherein a high-voltage heater assembly comprises a first-stage high-voltage heater, a second-stage high-voltage heater and a third-stage high-voltage heater, and/or a low-voltage heater assembly comprises a first-stage low-voltage heater, a second-stage low-voltage heater, a third-stage low-voltage heater and a fourth-stage low-voltage heater.
The number of heaters constituting both the high-pressure heater assembly and the low-pressure heater assembly in the present invention is not particularly limited. The high-pressure heater assembly and the low-pressure heater assembly in the present invention are provided with three heaters, respectively, in view of energy utilization efficiency and economy.
6. The invention provides an energy storage power generation system for a thermal power plant, which is used for the thermal power plant and further comprises:
The second-stage heat release mechanism comprises a feed water heater, a main feed water pump and a steam generator, wherein a gas working medium flowing out of a first passage of the first-stage heat release heat exchanger enters a heating feed water passage and/or a heating deoxidized water passage through a first three-way valve;
Simultaneously, a strand of water supply is led out after the main water supply pump, the second passage of the water supply heater absorbs heat energy and then is combined with a water supply main pipeline and enters a steam drum of the heating boiler so as to reduce the extraction amount of a high-pressure cylinder of a steam turbine and a medium-pressure cylinder of the steam turbine and provide a part of heat energy required by the high-pressure heater assembly, and/or,
Meanwhile, a stream of deoxygenated water is led out from the outlet position of the deoxygenator, the deoxygenated water is driven to flow into the second passage of the steam generator to absorb heat energy to a superheated steam state, and the obtained superheated steam flows to the low-pressure cylinder of the steam turbine and enters the low-pressure cylinder of the steam turbine to expand and work after being mixed with the exhaust steam of the medium-pressure cylinder of the steam turbine so as to improve the work load of the low-pressure cylinder of the steam turbine in the peak period of electricity consumption.
According to the invention, the second-stage heat release mechanism communicated with the first-stage heat release heat exchanger is arranged, and one of the gas working mediums of the second-stage heat release mechanism can enter the first passage of the feedwater heater to release heat energy, so that the utilization rate of the heat energy is improved. The other gas working medium of the second-stage heat release mechanism can enter the first passage of the steam generator to release heat energy, so that the utilization rate of the heat energy is improved. The arrangement realizes the second-stage heat release of the heat release system and effectively utilizes the energy of the thermal power plant.
7. The invention provides an energy storage power generation system for a thermal power plant, which is used for the thermal power plant and further comprises:
the third-stage heat release mechanism comprises a condensate water heater and a heat supply heat exchanger, wherein after the first passage of the steam generator and the gas working medium flowing out of the feed water heater are converged, the gas working medium is controlled by a second three-way valve to enter a heating condensate water passage and/or a heating passage respectively;
The first passage of the steam generator is converged with the gas working medium flowing out of the feed water heater, then the first passage of the condensate water heater 31 is led into the heating condensate water passage to release heat energy, meanwhile, partial condensate water is led out from the condensate water finishing device, enters the second passage of the condensate water heater to absorb heat energy, and then enters the deaerator along a pipeline to reduce the steam extraction amount of the low-pressure cylinder of the steam turbine and replace part of heat energy required by the low-pressure heater assembly, and/or,
And simultaneously, the water working medium in the thermodynamic system is driven to enter the second passage of the heat supply heat exchanger to absorb heat energy, and the heated water working medium is driven to be moved to the side of a heat user.
In the invention, after the first passage of the steam generator and the gas working medium flowing out of the feed water heater are converged, the gas working medium is driven to enter the third-stage heat release mechanism. One of the gas working mediums of the third-stage heat release mechanism is led into the first passage of the condensate heater 31 from the heating condensate passage to release heat energy, and the other gas working medium of the third-stage heat release mechanism is led into the first passage of the heat supply heat exchanger from the heating passage to release heat energy. The arrangement realizes the multi-stage heat release of the heat release system, effectively utilizes the energy of the thermal power plant and improves the energy utilization efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an energy storage power generation system for a thermal power plant according to the present invention;
fig. 2 is a schematic diagram of a furnace structure in the energy storage power generation system provided by the invention.
Reference numerals illustrate:
The system comprises a 1-heating boiler, a 2-turbine high-pressure cylinder, a 3-generator, a 4-steam drum, a 5-down pipe, a 6-reheater, a 7-superheater, a 8-packed bed high-temperature heat storage unit, a 9-turbine medium-pressure cylinder, a 10-turbine low-pressure cylinder, a 11-first-stage heat release heat exchanger, a 12-first regulating valve, a 13-deaerator, a 14-feed pump small turbine, a 15-condenser, a 16-shaft seal heater, a 17-condensate pump, a 18-condensate water finishing device, a 19-prepositioning pump, a 20-main feed water pump, a 21-first-stage high-pressure heater, a 22-second-stage high-pressure heater, a 23-third-stage high-pressure heater, a 24-first-stage low-pressure heater, a 25-second-stage low-pressure heater, a 26-third-stage low-pressure heater, a 27-fourth-stage low-pressure heater, a 28-feed water heater, a 29-steam generator, a 30-first three-way valve, a 31-condensate water heater, a 32-heat exchanger, a 33-second regulating valve, a 34-third regulating valve, a 35-third-stage heat pump, a 37-third-stage heat pump, a fan and a fan.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
An energy storage power generation system of a thermal power plant is described, as shown in fig. 1, comprising a power generation system, a heat storage system and a heat release system;
The power generation system comprises a heating boiler 1, a steam turbine high-pressure cylinder 2, a steam turbine medium-pressure cylinder 9, a steam turbine low-pressure cylinder 10, a generator 3 and three high-pressure heaters, wherein the three high-pressure heaters comprise a first-stage high-pressure heater 21, a second-stage high-pressure heater 22, a third-stage high-pressure heater 23, a main water feed pump 20, a pre-pump 19, a deaerator 13, a water feed pump small steam turbine 14, four low-pressure heaters, namely a first-stage low-pressure heater 24, a second-stage low-pressure heater 25, a third-stage low-pressure heater 26, a fourth-stage low-pressure heater 27, a shaft seal heater 16, a condensate water fine treatment device 18, a condensate water pump 17 and a condenser 15.
The operation flow of the power generation system is as follows:
Step 1, water enters a steam drum 4 of a heating boiler 1, water working medium descends to the bottom of a hearth along a descending pipe 5, the water working medium absorbs heat energy in the hearth and evaporates to a steam-water mixture, the steam-water mixture ascends back to the steam drum 4, and then flows out of the steam drum 4 and enters a superheater 7 to further absorb heat to main steam with high temperature and high pressure.
And 2, main steam flows into a turbine high-pressure cylinder 2 for expansion, cold reheat steam flowing out of an outlet of the turbine high-pressure cylinder 2 returns to a reheater 6 of a heating boiler 1 for absorbing heat to obtain hot reheat steam, and then flows into a turbine medium-pressure cylinder 9 and a turbine low-pressure cylinder 10 for expansion and work. The turbine high-pressure cylinder 2, the turbine medium-pressure cylinder 9 and the turbine low-pressure cylinder 10 are coaxially connected to drive the generator 3 to generate electricity.
Step 3, extracting steam from the turbine high-pressure cylinder 2 and the turbine medium-pressure cylinder 9, respectively supplying the steam to the first-stage high-pressure heater 21, the second-stage high-pressure heater 22 and the third-stage high-pressure heater 23, and the heating steam of the deaerator 13 and the steam supply of the small water-feeding pump turbine 14, and extracting steam from the turbine low-pressure cylinder 10, respectively supplying the heating steam to the first-stage low-pressure heater 24, the second-stage low-pressure heater 25, the third-stage low-pressure heater 26 and the fourth-stage low-pressure heater 27 in the invention.
In step 4, the condenser 15 condenses the exhaust steam from the low-pressure cylinder 10 of the steam turbine into condensate, and the condensate is collected in a hot well and sent to the condensate polishing device 18 by the condensate pump 17. The steam discharged by the small steam turbine 14 of the feed pump is introduced into the condenser 15, and the supplementing water is supplemented by the condenser 15.
In step 5, the first-stage high-pressure heater 21, the second-stage high-pressure heater 22 and the third-stage high-pressure heater 23 are respectively provided with a built-in steam cooling section and a built-in drain cooling section, and only the built-in drain cooling sections are arranged in the first-stage low-pressure heater 24, the second-stage low-pressure heater 25, the third-stage low-pressure heater 26 and the fourth-stage low-pressure heater 27. The drain water of the high-pressure heater automatically flows into the deaerator 13 in a step-by-step self-flowing mode, and the drain water of the low-pressure heater automatically flows step by step, is collected with the drain water of the shaft seal heater 16 and flows into a hot well of the condenser 15. And, the steam source of the shaft seal heater 16 adopts turbine shaft seal steam.
The condensate in the condenser hot well sequentially enters a condensate pump 17, a condensate fine treatment device 18, a shaft seal heater 16 and a low-pressure heater component and then enters a deaerator 13. Deoxygenated water enters the drum 4 of the heating boiler 1 from the deoxygenator feed tank via the pre-pump 19, main feed pump 20 and high pressure heater assembly.
The heat storage system comprises a packed bed high temperature heat storage unit 8 and an induced draft fan 35.
The operation flow of the heat storage system is as follows:
During the electricity consumption valley period, high-temperature flue gas is extracted from the furnace chamber of the heating boiler 1, enters the packed bed high-temperature heat storage unit 8 from the top of the packed bed high-temperature heat storage unit 8, exchanges heat with the solid heat storage material in the packed bed high-temperature heat storage unit 8, and stores heat energy in the packed bed high-temperature heat storage unit. The gas released with heat energy is returned to the heating boiler 1 along the pipeline by the induced draft fan 35, and enters the dust remover 36 for dust removal after being converged with the flue gas in the heating boiler 1. In the invention, the redundant heat energy generated by the thermal power plant in the electricity consumption low-valley period is stored in the heat storage mode. The thermal power plant can stably run in the electricity consumption valley period and simultaneously realize the improvement of the deep peak regulation capability.
The heat release system comprises a packed bed high temperature heat storage unit 8, a circulating fan 37, a first stage heat release heat exchanger 11, a first three-way valve 30, a feedwater heater 28, a steam generator 29, a second three-way valve 40, a condensate heater 31, a heat supply heat exchanger 32, a first regulating valve 12, a second regulating valve 33, a booster water pump 38, a third regulating valve 34 and a heat supply water pump 39.
The heat release system is provided with three stages of heat release mechanisms, and the structure and the operation flow of each heat release mechanism are as follows:
and the first-stage heat release mechanism is used for heating cold reheat steam, replacing heat energy required by a part of reheater 6 positions in the electricity peak period, and improving the top load capacity of the unit.
The gas working medium is driven by the circulating fan 37, enters the packed bed high temperature heat storage unit 8 to absorb heat energy to a high temperature state, and then enters the first passage of the first stage heat release heat exchanger 11 along the pipeline to release heat energy.
At the same time, a strand of cold reheat steam is extracted from the outlet of the steam turbine high pressure cylinder 2, enters the second passage of the first stage heat release heat exchanger 11 to absorb heat energy to a hot reheat steam state, returns to the hot reheat steam main pipeline along the pipeline, and flows to the steam turbine intermediate pressure cylinder 9 to do work.
The amount of cold reheat steam extracted is controlled by the first damper valve 12.
The second stage heat release mechanism comprises two branches, namely a heating water supply passage and a heating deoxygenation water passage. The gas working medium flowing out of the first passage of the first stage heat release heat exchanger 11 is split into two streams through the first three-way valve 30.
A stream of gas in the gaseous medium passes along the conduit into the first pass of the feedwater heater 28 to release thermal energy. At the same time, a supply of feedwater is drawn from behind the main feedwater pump 20, enters the second pass of the feedwater heater 28, absorbs thermal energy, merges with the feedwater main and enters the drum 4. The above-mentioned amount of the supplied water is controlled by the second regulating valve 33. The second stage heat release mechanism can replace part of heat energy required by the high pressure heater assembly, so that the steam extraction amount of the high pressure cylinder 2 and the medium pressure cylinder 9 of the steam turbine is reduced. The working capacities of the high-pressure cylinder 2 and the medium-pressure cylinder 9 of the steam turbine are improved during the electricity utilization peak period, and the top load capacity of the unit is improved.
Another gas in the gaseous medium passes along the line into the first pass of the steam generator 29 to release thermal energy. At the same time, a stream of deoxygenated water is led out from the outlet of the deoxygenator 13, pumped into the second passage of the steam generator 29 by the booster water pump 38 to absorb heat energy to a superheated steam state, flows to the inlet of the low pressure cylinder 10 of the steam turbine along a pipeline, is mixed with the steam discharged by the medium pressure cylinder 9 of the steam turbine, and enters the low pressure cylinder 10 of the steam turbine to expand and apply work. The process increases the work capacity of the low-pressure cylinder 10 of the steam turbine in the electricity utilization peak period, thereby improving the output power of the generator set.
The third-stage heat release mechanism comprises two branches, namely a heating condensation passage and a heating passage. The gas working medium flowing out of the first passages of the feedwater heater 28 and the steam generator 29 are merged and split into two by the second three-way valve 40.
One of the gas working fluids is introduced into the first passage of the condensate heater 31 along the pipeline to release heat energy. At the same time, a strand of condensate is led out from the outlet position of the condensate polishing device 18, enters the second passage of the condensate heater 31 to absorb heat energy, and then enters the deaerator 13 along the pipeline. The amount of condensate is controlled by a third regulator valve 34. The above process can replace a part of the heat energy required by the low pressure heater assembly, thereby reducing the steam extraction amount of the low pressure cylinder and improving the functional capacity of the low pressure cylinder 10 of the steam turbine.
The other of the gaseous fluids passes through the first and third passages of the second three-way valve 40 and flows along the pipeline into the first passage of the heat-supplying heat exchanger 32 to release heat energy. Meanwhile, the hot water pump 39 drives the water working medium into the second passage of the heat-supplying heat exchanger 32 to absorb heat energy, and the heat energy is sent to the heat user side. The above process may provide a portion of the heat supply during the peak hours of use.
Of course, the heat storage structure and principle of the heat storage system are not particularly limited in this embodiment, and in other embodiments, the heat storage system may also implement heat storage in other heat storage manners such as phase change heat storage materials.
Of course, the shape or the internal structure of the packed bed high temperature heat storage unit 8 is not particularly limited in this embodiment, and in other embodiments, the packed bed high temperature heat storage unit 8 may be cylindrical, spherical or rectangular, and is composed of a pressure-bearing thermal insulation packed bed, cell channels arranged in a positive or staggered manner, and a heat storage medium.
Of course, the heat transfer medium used in the packed bed high temperature heat storage unit 8 is not particularly limited in this embodiment, and in other embodiments, the flue gas or air of the packed bed high temperature heat storage unit 8 is the heat transfer medium.
Of course, the heat storage medium adopted in the packed bed high temperature heat storage unit 8 is not particularly limited in this embodiment, and in other embodiments, the packed bed high temperature heat storage unit 8 adopts a solid material as the heat storage medium, and the solid heat storage medium is granular or porous, and is one or a mixture of at least two of rock, ore, slag, concrete, refractory brick, ceramic balls, metal, encapsulated phase change material, and the like.
Of course, the heat storage medium adopted by the packed bed high temperature heat storage unit 8 is not particularly limited in this embodiment, and in other embodiments, the packed bed high temperature heat storage unit 8 may adopt a series arrangement, a parallel arrangement, or a combination of series and parallel arrangements.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
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| CN115750003B (en) * | 2022-11-07 | 2024-09-27 | 华电电力科学研究院有限公司 | Peak regulating system under pure condensation working condition of coal machine and working method thereof |
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| JP2558740B2 (en) * | 1987-09-30 | 1996-11-27 | 株式会社東芝 | How to start up a two-stage reheat steam turbine plant |
| DE102009014447A1 (en) * | 2009-03-23 | 2010-09-30 | Man Turbo Ag | Power plant for IGSC process |
| CN106123040B (en) * | 2016-06-27 | 2018-09-11 | 中国科学院工程热物理研究所 | The solar heat power generation system of integrated twin furnace biomass boiler |
| RU2717181C1 (en) * | 2016-11-29 | 2020-03-18 | Висдри Сити Инвайронмент Протекшн Инжиниринг Ко., Лтд | Electric power generation system and method of power generation from coal gas with low calorific value |
| CN207989089U (en) * | 2018-01-24 | 2018-10-19 | 北京易泽动力科技有限公司 | A kind of efficient heating system of cogeneration units recycling heat release based on condensed water |
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| CN113915600B (en) * | 2021-11-01 | 2024-03-26 | 金建祥 | Energy utilization system |
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