CN114593028B - A thermal power unit transformation solar thermal power generation system and transformation method - Google Patents
A thermal power unit transformation solar thermal power generation system and transformation method Download PDFInfo
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- CN114593028B CN114593028B CN202210190079.3A CN202210190079A CN114593028B CN 114593028 B CN114593028 B CN 114593028B CN 202210190079 A CN202210190079 A CN 202210190079A CN 114593028 B CN114593028 B CN 114593028B
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- 238000010248 power generation Methods 0.000 title claims abstract description 34
- 230000009466 transformation Effects 0.000 title abstract description 3
- 238000011426 transformation method Methods 0.000 title description 2
- 238000005338 heat storage Methods 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000000605 extraction Methods 0.000 claims abstract description 11
- 238000005485 electric heating Methods 0.000 claims description 23
- 150000003839 salts Chemical class 0.000 claims description 13
- 239000011449 brick Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000011232 storage material Substances 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 claims description 3
- 239000008236 heating water Substances 0.000 claims description 3
- 238000002715 modification method Methods 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
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- 239000000284 extract Substances 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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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
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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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 invention discloses a thermal power unit reconstruction photo-thermal electric heat storage power generation system and a reconstruction method, wherein the system comprises a photo-thermal steam generator or an electric heat storage steam generator, a steam turbine, a generator, a heat supply steam extraction pipeline and a heat supply network heater; the electric heat storage energy storage technology is combined with the photo-thermal steam generator technology, the electric energy storage technology is driven by the peak regulation and frequency modulation surplus electric power of the wind-solar water nuclear clean power generation or the electric network, so that the energy storage with low cost and long service life is realized, the purpose of completely replacing the coal-fired boiler of the original thermal power generating unit is realized by combining the photo-thermal steam generator technology, the steam turbine and the generator of the original unit are recycled, the low-carbon clean energy transformation of the coal-fired thermal power generating unit is realized, and the requirement of heat supply of the original heat supply network or the heat supply of industrial steam is met. The recycling of the existing shutdown or retired thermal power generating unit is realized, and the life-prolonging and personnel employment stability of the unit are realized.
Description
Technical Field
The invention belongs to the field of electric heat storage, and particularly relates to a thermal power unit transformation photo-thermal electric heat storage power generation system and a transformation method.
Background
Coal is widely used in the fields of power generation, steel industry, cement production, building materials, chemicals, buildings and the like. Wherein, the coal consumption in the power industry is relatively high. Traditional thermal power is the center of gravity of coal consumption in the power industry, and the development condition of a thermal power unit has an important influence on the peak of carbon emission in the power industry.
With the further promotion of the 'double carbon' work in the power industry, a plurality of thermal power generating units below 600MW are generated at present, and the problems of shutdown or retirement are faced due to the fact that the upper pressure is small, the carbon emission is reduced, and the coal consumption is controlled. Not only causes the social problems of difficult personnel distribution, employment and transfer of the thermal power plant, but also wastes thermal power unit equipment which still has very high use value in the short term, and simultaneously, the shutdown of the heat supply of the thermal power unit becomes a new problem, and not only needs the investment of new alternative heat supply devices of power generation enterprises, thereby causing more operation difficulties for the thermal power enterprises in the recent high-coal-price background. On the other hand, after many energy storage batteries are subjected to peak regulation and frequency modulation, or built, the problems of high investment, short service life of the batteries and the like exist.
Disclosure of Invention
The invention aims to provide a thermal power unit reconstruction photo-thermal electric heat storage power generation system and a reconstruction method, which are used for solving the problem of waste caused by shutdown or retirement of traditional thermal power unit equipment in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The invention provides a modified photo-thermal power heat storage power generation system of a thermal power generating unit, which comprises a steam generator, a steam turbine, a generator, a heat supply steam extraction pipeline and a heat supply network heater, wherein the steam generator is connected with the steam turbine;
Wherein the steam generator is a photo-thermal steam generator or an electric heat storage steam generator;
The steam output side of the steam generator is connected to a steam turbine, and the power output side of the steam turbine is connected to a generator; one end of the heat supply steam extraction pipeline is connected to the steam side of the steam turbine, the other end of the heat supply steam extraction pipeline is connected to a heat supply network heater, and the heat supply network heater is used for heating water in a heat supply network water supply pipeline and supplying heat in a hot water mode through a heat supply network water return pipeline.
Optionally, the photo-thermal steam generator comprises a preheater, an evaporator, a superheater and a reheater, wherein a water supply pipeline sequentially passes through the preheater, the evaporator, the superheater and the reheater, a superheated steam outlet of the reheater is connected to a steam inlet of a high-pressure cylinder of the steam turbine, and a steam outlet of the high-pressure cylinder is connected to a steam inlet of a low-pressure cylinder of the steam turbine after passing through the reheater; the high-temperature molten salt pipeline respectively enters the superheater and the reheater, and then enters the evaporator and the preheater after being integrated into one path.
Optionally, a steam outlet of the low-pressure cylinder of the steam turbine is connected with a condenser.
Optionally, the electric heat storage steam generator comprises a heat storage body, an electric heating element, a main steam supply pipe and a heat exchange coil;
the electric heating element is arranged in the heat exchange coil and is connected with a power supply module for heating the heat exchange coil;
The main steam supply pipe and the heat exchange coil are arranged in the heat accumulator, the main steam supply pipe is adjacent to the heat exchange coil, and the main steam supply pipe is used for exchanging heat with the heat exchange coil to obtain heat required by steam.
Optionally, the heat accumulator is any one of a solid heat accumulator brick, a concrete heat accumulator and a phase change heat accumulator brick.
Optionally, the electric heating element is any one of an electric heating wire, an electric heating plate and an electric heating tube.
Optionally, the electric heating element is connected with a power supply module, and the electric energy of the power supply module is from surplus electric power of any one of wind power, photovoltaic power generation, water power, nuclear power and coal power generation devices.
Optionally, the heat exchange coil is externally provided with a reinforced heat exchange component, and the reinforced heat exchange component is any one of a fin, a flexible reinforced heat exchange spiral sheet, a round sheet and a special-shaped sheet.
Optionally, the photo-thermal steam generator is any one or combination of a groove type photo-thermal heat collector, a Fresnel photo-thermal heat collector, a tower type condensation heat collector and a disc type photo-thermal heat collector.
The invention also provides a reconstruction method for reconstructing the photo-thermal power generation system of the thermal power generating unit, which comprises the following steps:
According to the capacities of the thermal power unit and the capacities of the boiler, the steam turbine and the generator, the types and the steam production amount of the matched photo-thermal steam generator and the electric heat storage steam generator are designed, and the continuous power and heat supply production requirements of the steam turbine and the generator of the existing thermal power unit are met;
According to the space and sunlight conditions in the thermal power plant, selecting any one or combination of a groove type photo-thermal heat collector, a Fresnel photo-thermal heat collector, a tower type photo-thermal heat collector and a disc type photo-thermal heat collector to generate steam meeting the steam supply requirement of the existing steam turbine, namely pressure, temperature and superheat degree;
According to the space in the thermal power plant and the geological conditions in the plant, selecting fused salt heat storage, solid heat storage bricks, concrete heat storage or phase change heat storage materials, and heating the heat storage materials to store heat by using the power grid;
Designing a heat exchange pipe and reinforcing heat exchange measures thereof, and supplying the heat exchange pipe and reinforcing heat exchange measures to a photo-thermal steam generator or an electric heat storage steam generator by using a high-pressure heater and a water supply system to generate steam meeting preset flow, pressure, temperature and superheat degree to a steam turbine;
The steam turbine supplies heat and extracts steam to meet the heat supply quantity required by the heat supply network of the thermal power generating unit responsible for supplying heat, and the deficiency part is met by using a photo-thermal steam generator or an electric heat storage steam generator.
The technical scheme of the invention has the following beneficial technical effects:
1. the invention relates to a thermal power generating unit reconstruction photo-thermal power storage power generation system, which combines electric heat storage energy storage and photo-thermal steam generator technologies, and utilizes the peak regulation and frequency modulation surplus electric power of a power grid for wind-solar water nuclear clean power generation to drive the electric heat storage energy storage, thereby realizing low-cost and long-service-life energy storage. The recycling of the existing shutdown or retired thermal power generating unit is realized, and the life-prolonging and personnel employment stability of the unit are realized.
2. The invention discloses a thermal power unit reconstruction photo-thermal power heat storage power generation system, which directly heats a heat storage material by using surplus power of peak regulation and frequency modulation of wind, light, water and nuclear or power grid, and realizes energy storage, peak regulation and frequency modulation of variable relative power. And the electric heating heat storage device is utilized to realize the consumption and energy storage of wind power, photoelectricity, water power and nuclear power at any time, and the requirements of the power grid on peak regulation and frequency modulation auxiliary service are responded.
3. According to the invention, the thermal power unit is transformed into the photo-thermal electric heat storage power generation system, the electric heat storage cost is greatly lower than that of electrochemical energy storage, and the initial investment of the energy storage device matched with clean energy power generation such as wind power, photovoltaic and the like can be reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
Fig. 1 is a schematic diagram of a thermal power generating unit reconstruction photo-thermal electric heat storage power generation system according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a photo-thermal steam generator according to an embodiment of the present invention.
Fig. 3 is a flowchart of a method for modifying a photo-thermal power generation system by modifying a thermal power generating unit according to an embodiment of the invention.
Wherein: 1a steam generator; 2, a steam turbine; 3, a generator; 4, a heat supply steam extraction pipeline; 5 a heating network heater; 6a heat supply network water supply pipeline; 7, a heat supply network water return pipeline; 10 a preheater; a 20 evaporator; 30 superheater; a 40 high pressure cylinder; 50 reheater; a 60 low pressure cylinder; 70 condenser.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the application. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the application.
As shown in fig. 1, in a first aspect of the embodiment of the present invention, a modified photo-thermal power generation system of a thermal power generating unit is provided, which comprises a steam generator 1, a steam turbine 2, a generator 3, a heat supply steam extraction pipeline 4 and a heat supply network heater 5; wherein the steam generator 1 is a photo-thermal steam generator or an electric heat storage steam generator which can replace a coal-fired boiler; the steam output side of the steam generator 1 is connected to the steam turbine 2, and the power output side of the steam turbine 2 is connected to the generator 3; the photo-thermal steam generator or the electric heat storage steam generator is connected with a water supply pipeline, solar energy condensation heat or electric network peak regulation and frequency modulation surplus electric power is utilized to heat the electric heat storage body, the generated steam is sent to a steam turbine 2 of the original thermal power generating unit to generate rotation mechanical energy, and the steam turbine 2 drives a generator 3 to generate electricity. The heat supply steam extraction pipeline 4 has one end connected to the steam side of the steam turbine 2 and the other end connected to the heat supply network heater 5, and the heat supply network heater 5 is used for heating water in the heat supply network water supply pipeline 6 and supplying heat in a hot water mode through the heat supply network water return pipeline 7.
The embodiment of the invention provides a thermal power unit reconstruction photo-thermal power heat storage power generation system, which combines the technologies of electric heat storage energy storage and a photo-thermal steam generator, and utilizes the peak regulation frequency modulation surplus power of the power grid or the waste electricity of wind-solar water nuclear clean power generation to drive the electric heat storage energy storage, thereby realizing low-cost and long-service-life energy storage.
In other embodiments, the photo-thermal steam generator is any one or combination of a trough photo-thermal collector, a fresnel photo-thermal collector, a tower concentrator collector, a dish photo-thermal collector.
As shown in fig. 2, as one embodiment applied to the present invention, the photo-thermal steam generator includes a preheater 10, an evaporator 20, a superheater 30 and a reheater 50, a water supply pipe passes through the preheater 10, the evaporator 20, the superheater 30 and the reheater 50 in this order, a superheated steam outlet of the reheater 50 is connected to a steam inlet of a high pressure cylinder 40 of the steam turbine 2, and a steam outlet of the high pressure cylinder 40 is connected to a steam inlet of a low pressure cylinder 60 of the steam turbine 2 after passing through the reheater 50; the high-temperature molten salt pipeline respectively enters the superheater 30 and the reheater 50, then enters the evaporator 20 and the preheater 10 after entering the same path, and a steam outlet of the low-pressure cylinder 60 of the steam turbine 2 is connected with a condenser 70. The high-temperature molten salt from the hot salt tank enters the superheater 30 and the reheater 50 respectively in two paths, is mixed at an outlet after heat exchange, then sequentially enters the steam generator 1 and the water supply preheater 10, and finally returns to the low-temperature storage tank after being changed into low-temperature molten salt. And the feed water from the high-pressure heater sequentially flows through the feed water preheater 10, the evaporator 20 and the superheater 30, so that heat exchange between molten salt and water working medium is realized, and superheated steam meeting the operation requirement of the steam turbine 2 is generated. After the superheated steam is subjected to work in the high-pressure cylinder 40 of the steam turbine 2, the exhaust steam enters the reheater 50, is heated by molten salt of the reheater 50, enters the low-pressure cylinder 60 of the steam turbine 2 to continue to perform work, and is finally discharged into the condenser.
As one embodiment applied to the present invention, an electric heat storage steam generator includes a heat storage body, an electric heating element, a main steam supply pipe, and a heat exchange coil; the electric heating element is arranged in the heat exchange coil and is connected with a power supply module for heating the heat exchange coil; the main steam supply pipe and the heat exchange coil are arranged in the heat accumulator, the main steam supply pipe is adjacent to the heat exchange coil, and the main steam supply pipe is used for exchanging heat with the heat exchange coil to obtain heat required by steam.
As a preferred embodiment of the present invention, the electric heating element is connected to a power supply module, and the power of the power supply module is derived from surplus power of any one of wind power, photovoltaic power generation, hydroelectric power, nuclear power and coal power, or is any one or a combination of off-peak electricity, peak-shaving surplus power, frequency-modulation surplus power and accumulator power of the power grid. And directly heating the heat storage material by using surplus power of peak regulation and frequency modulation of wind, light and water discarding, nuclear discarding or power grid, so as to realize energy storage, peak regulation and frequency modulation of variable relative power. And the electric heating heat storage device is utilized to realize the consumption and energy storage of wind power, photoelectricity, water power and nuclear power at any time, and the requirements of the power grid on peak regulation and frequency modulation auxiliary service are responded.
In other embodiments, the thermal mass is any one of a molten salt thermal mass tank, a solid thermal mass brick, a concrete thermal mass, a phase change thermal mass brick, and a molten salt unit thermal mass.
In other embodiments, the electric heating element is any one of an electric heating wire, an electric heating plate and an electric heating tube, and is used for heating the heat accumulator to store heat.
As a preferred embodiment, the heat exchange coil is externally provided with a reinforced heat exchange assembly. As an example of this embodiment, the enhanced heat exchange component is any one of a fin, a flexible enhanced heat exchange spiral sheet, a round plate sheet, and a special-shaped sheet.
As shown in fig. 3, in a second aspect of the embodiment of the present invention, a method for modifying a photo-thermal power generation system by modifying a thermal power plant is provided, and the method includes the following steps based on the existing thermal power plant:
According to the capacities of the thermal power unit and the capacities of the boiler, the steam turbine 2 and the generator 3, the types and the steam production amount of the matched photo-thermal steam generator and the electric heat storage steam generator are designed, and the continuous power and heat supply production requirements of the steam turbine 2 and the generator 3 of the existing thermal power unit are met;
According to the space and sunlight conditions in the thermal power plant, selecting any one or combination of a groove type photo-thermal heat collector, a Fresnel photo-thermal heat collector, a tower type photo-thermal heat collector and a disc type photo-thermal heat collector to generate steam meeting the steam supply requirement of the existing steam turbine 2, namely pressure, temperature and superheat degree;
According to the space in the thermal power plant and the geological conditions in the plant, selecting fused salt heat storage, solid heat storage bricks, concrete heat storage or phase change heat storage materials, and heating the heat storage materials to store heat by using the power grid;
Designing a heat exchange pipe and reinforcing heat exchange measures thereof, and supplying the high-pressure heater and a water supply system to a photo-thermal steam generator or an electric heat storage steam generator to generate steam meeting preset flow, pressure, temperature and superheat degree to a steam turbine 2;
the steam turbine 2 supplies heat and extracts steam to meet the heat supply quantity required by the heat supply network of the thermal power generating unit responsible for heat supply, and the deficiency part is met by using a photo-thermal steam generator or an electric heat storage steam generator.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (8)
1. The modified photo-thermal power heat storage power generation system of the thermal power generating unit is characterized by comprising a steam generator (1), a steam turbine (2), a generator (3), a heat supply steam extraction pipeline (4) and a heat supply network heater (5);
wherein the steam generator (1) is a photo-thermal steam generator or an electric heat storage steam generator;
The steam output side of the steam generator (1) is connected to a steam turbine (2), and the power output side of the steam turbine (2) is connected to a generator (3); one end of the heat supply steam extraction pipeline (4) is connected to the steam side of the steam turbine (2), the other end of the heat supply steam extraction pipeline is connected to the heat supply network heater (5), and the heat supply network heater (5) is used for heating water in the heat supply network water supply pipeline (6) and supplying heat in a hot water mode through the heat supply network water return pipeline (7);
The photo-thermal steam generator comprises a preheater (10), an evaporator (20), a superheater (30) and a reheater (50), wherein a water supply pipeline sequentially passes through the preheater (10), the evaporator (20), the superheater (30) and the reheater (50), a superheated steam outlet of the reheater (50) is connected to a steam inlet of a high-pressure cylinder (40) of the steam turbine (2), and a steam outlet of the high-pressure cylinder (40) is connected to a steam inlet of a low-pressure cylinder (60) of the steam turbine (2) after passing through the reheater (50); the high-temperature molten salt pipeline respectively enters a superheater (30) and a reheater (50), and then enters an evaporator (20) and a preheater (10) in sequence after being mixed into one path; or the electric heat storage steam generator comprises a heat accumulator, an electric heating element, a main steam supply pipe and a heat exchange coil; the electric heating element is arranged in the heat exchange coil and is connected with a power supply module for heating the heat exchange coil; the main steam supply pipe and the heat exchange coil are arranged in the heat accumulator, the main steam supply pipe is adjacent to the heat exchange coil, and the main steam supply pipe is used for exchanging heat with the heat exchange coil to obtain heat required by steam.
2. The thermal power generating unit reconstruction photo-thermal electric heat storage power generation system according to claim 1, wherein a steam outlet of a low pressure cylinder (60) of the steam turbine (2) is connected with a condenser (70).
3. The modified photo-thermal power generation system of thermal power generating unit according to claim 1, wherein the heat accumulator is any one of solid heat accumulating brick, concrete heat accumulator and phase change heat accumulator brick.
4. The modified photo-thermal power generation system of a thermal power generating unit according to claim 1, wherein the electric heating element is any one of an electric heating wire, an electric heating plate and an electric heating tube.
5. The modified photo-thermal power and heat storage power generation system of a thermal power generating unit according to claim 1, wherein the electric heating element is connected with a power supply module, and the electric energy of the power supply module is from surplus electric power of any one of wind power, photovoltaic power generation, water power, nuclear power and coal power generation devices.
6. The modified photo-thermal power and heat storage power generation system of a thermal power generating unit according to claim 1, wherein the heat exchange coil is externally provided with a reinforced heat exchange component, and the reinforced heat exchange component is any one of a fin, a flexible reinforced heat exchange spiral sheet, a round sheet and a special-shaped sheet.
7. The thermal power generating unit reconstruction photo-thermal electric heat storage power generation system according to claim 1, wherein the photo-thermal steam generator is any one or combination of a groove type photo-thermal heat collector, a fresnel photo-thermal heat collector, a tower type condensation heat collector and a disc type photo-thermal heat collector.
8. A modification method of a thermal power generating unit modified photo-thermal electric heat storage power generation system according to claim 1, comprising the following steps:
According to the capacity of the thermal power generating unit and the capacities of the boiler, the steam turbine (2) and the generator (3), the types and the steam generation amount of the matched photo-thermal steam generator and the electric heat storage steam generator are designed, and the continuous power and heat supply production requirements of the steam turbine (2) and the generator (3) of the existing thermal power generating unit are met;
According to the space and sunlight conditions in the thermal power plant, selecting any one or combination of a groove type photo-thermal heat collector, a Fresnel photo-thermal heat collector, a tower type photo-thermal heat collector and a dish type photo-thermal heat collector to generate steam meeting the steam supply requirement of the existing steam turbine (2) on pressure, temperature and superheat degree;
According to the space in the thermal power plant and the geological conditions in the plant, selecting fused salt heat storage, solid heat storage bricks, concrete heat storage or phase change heat storage materials, and heating the heat storage materials to store heat by using the power grid;
Designing a heat exchange pipe and reinforcing heat exchange measures thereof, and supplying the heat exchange pipe and reinforcing heat exchange measures to a photo-thermal steam generator or an electric heat storage steam generator by using a high-pressure heater and a water supply system to generate steam meeting preset flow, pressure, temperature and superheat degree to a steam turbine (2);
the heat supply and steam extraction of the steam turbine (2) meet the heat supply quantity required by the heat supply network of the thermal power generating unit responsible for heat supply, and the deficiency part is met by a photo-thermal steam generator or an electric heat storage steam generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190079.3A CN114593028B (en) | 2022-02-28 | 2022-02-28 | A thermal power unit transformation solar thermal power generation system and transformation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190079.3A CN114593028B (en) | 2022-02-28 | 2022-02-28 | A thermal power unit transformation solar thermal power generation system and transformation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114593028A CN114593028A (en) | 2022-06-07 |
| CN114593028B true CN114593028B (en) | 2024-11-26 |
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