CN114934826A - Photo-thermal and thermal power combined power generation and heating system with energy storage and peak regulation functions - Google Patents
Photo-thermal and thermal power combined power generation and heating system with energy storage and peak regulation functions 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
- 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
- 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
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- 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
- 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
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
- F03G6/067—Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
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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
- F03G6/071—Devices for producing mechanical power from solar energy with energy storage devices
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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
- F03G6/098—Components, parts or details
- F03G6/108—Components, parts or details of the heat transfer system
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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
- F03G6/121—Controlling or monitoring
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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
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- 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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Abstract
The invention discloses a photo-thermal and thermal power combined power generation and heating system with energy storage and peak regulation functions, which mainly adopts the technical scheme that a heating network heater is arranged; the thermal power generating unit comprises a boiler, a steam turbine connected with the boiler, a condensation unit connected with the steam turbine, and heater units respectively connected with the steam turbine and the condensation unit; the steam turbine comprises a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder which are connected with the boiler, a steam exhaust port of the steam turbine intermediate-pressure cylinder is connected with an inlet of the steam turbine low-pressure cylinder through a first control valve, and a steam exhaust port of the steam turbine intermediate-pressure cylinder is connected with an inlet of the heat supply network heater through a second control valve; the photo-thermal heat collection group comprises a photo-thermal heat collector and a heat exchanger; the inlet of the heat exchanger is connected with the outlet of the condensate pump through a third control valve, the outlet of the heat exchanger is connected with the inlet of the low-pressure cylinder of the steam turbine through a fourth control valve and a first control valve, and the outlet of the heat exchanger is connected with the heating network heater through the fourth control valve and a second control valve.
Description
Technical Field
The invention relates to the technical field of power generation and heat supply, in particular to a photo-thermal and thermal power combined power generation and heating system with an energy storage and peak regulation function.
Background
In recent years, new energy power generation is rapidly increased, investment is always reduced, but the development of new energy is influenced even if the investment cost is high, particularly the photo-thermal power generation technology, and the investment cost of the photo-thermal power generation is particularly high compared with that of wind power generation and photovoltaic power generation, so that the industrialization development of the photo-thermal power generation technology is severely restricted. On the other hand, with the development of new energy, the requirements for peak shaving and energy storage capacities born by thermal power units are increasing due to the congenital defect that the new energy cannot generate electricity according to the requirements of users.
The complementary of thermal power generation, photo-thermal power generation and heat supply can be realized while the power generation and heat supply of the thermal power generation are combined with the photo-thermal power generation. Meanwhile, as the heat transfer medium of the photo-thermal power generation has the heat storage capacity, the thermal power generating unit can store the energy of the photo-thermal power generation by using the medium, so that the heat supply of the thermal power generation is combined with the photo-thermal power generation, the binding of the power generation and the heat supply of the thermal power generation thermoelectric unit can be released flexibly, the thermoelectric decoupling of the thermoelectric unit is realized, and the scheduling flexibility and the deep peak shaving capacity of the thermal power generating unit are improved.
Disclosure of Invention
In view of this, the invention provides a photo-thermal and thermal power combined power generation and heating system with an energy storage and peak regulation function, and mainly aims to effectively solve the problems that the existing photo-thermal power generation is high in investment cost, unstable in light energy power generation, weak in peak regulation capability of a thermal power heating unit and the like.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a photo-thermal and thermal power combined power generation and heating system with an energy storage and peak regulation function. It includes:
a heat supply network heater;
the thermal power generating unit comprises a boiler, a steam turbine connected with the boiler, a condensation unit connected with the steam turbine, and heater units respectively connected with the steam turbine and the condensation unit; the steam turbine comprises a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder which are connected with the boiler, a steam exhaust port of the steam turbine intermediate-pressure cylinder is connected with an inlet of the steam turbine low-pressure cylinder through a first control valve, a steam exhaust port of the steam turbine intermediate-pressure cylinder is connected with an inlet of the heat supply network heater through a second control valve, and the condensation unit comprises a condenser and a condensate pump connected with the condenser; when the thermal power generating unit normally operates, steam generated by the boiler enters a high-pressure cylinder of the steam turbine to do work, then returns to the boiler to be reheated and absorb heat, the reheated steam after absorbing heat enters a medium-pressure cylinder of the steam turbine to do work, one path of the steam after doing work enters a low-pressure cylinder of the steam turbine to do work to become condensed water, then enters the boiler to absorb heat to become new steam again after passing through a condensation unit and a heater unit in sequence, and the other path of the steam enters a heating network heater to supply heat, so that power generation and heat supply of a conventional thermal power plant are realized;
the photo-thermal heat collection group comprises a photo-thermal heat collector and a heat exchanger; an inlet of the heat exchanger is connected with an outlet of the condensate pump through a third control valve, an outlet of the heat exchanger is connected with an inlet of a low-pressure cylinder of the steam turbine through a fourth control valve and a first control valve, an outlet of the heat exchanger is connected with the heat supply network heater through a fourth control valve and a second control valve, an inlet of the heat exchanger is connected with the condenser through a fifth control valve, and the thermal power unit realizes peak load regulation of the thermal power unit through the control of the fourth control valve and the fifth control valve; the photo-thermal collector is internally provided with a heat storage working medium, and the photo-thermal collection set is used for conveying the heat storage working medium from the photo-thermal collector to the heat exchanger and then conveying the heat storage working medium from the heat exchanger to the photo-thermal collector to realize the storage and conveying circulation of a hot and cold working medium or a cold and hot working medium of the heat storage working medium;
the photothermal heat collector conveys a heat storage working medium to the heat exchanger, the heat exchanger heats the condensed water at the outlet of the condensed water pump to superheated steam matched with the temperature and the pressure of steam at the inlet of the low-pressure cylinder of the steam turbine through the hot working medium, the superheated steam respectively enters the low-pressure cylinder of the steam turbine and the heating network heater to realize the power generation and heat supply of the photothermal heat collecting equipment, and the simultaneous power generation and the simultaneous heat supply of the thermal power generating unit and the photothermal heat collecting unit are realized through the control of the first control valve, the second control valve, the third control valve and the fourth control valve;
as mentioned above, the superheated steam outlet of the boiler is connected to the inlet of the high-pressure cylinder of the steam turbine, the reheater inlet of the boiler is connected to the exhaust port of the high-pressure cylinder of the steam turbine, the outlet of the reheater of the boiler is connected to the inlet of the medium-pressure cylinder of the steam turbine, and the exhaust port of the low-pressure cylinder of the steam turbine is connected to the condenser;
the heater unit comprises a water feeding pump, a low-pressure heater connected with an outlet of the condensate pump, a deaerator and a high-pressure heater group which are respectively connected with the low-pressure heater and the water feeding pump; one end of the high-pressure heater group is connected with the feed pump, and the other end of the high-pressure heater group is connected with the boiler inlet; the high-pressure heater group comprises three high-pressure heaters which are connected in series, the steam extraction of the high-pressure cylinder of the steam turbine is respectively connected with the two high-pressure heaters, the steam extraction of the medium-pressure cylinder of the steam turbine is respectively connected with one high-pressure heater and the deaerator, and the steam extraction of the low-pressure cylinder of the steam turbine is connected with the low-pressure heater.
As previously described, the first control valve, the second control valve, the third control valve, the fourth control valve, and the fifth control valve are all regulating valves.
As mentioned above, the photo-thermal collection group further includes at least one hot working medium storage station connected to the photo-thermal collector and the heat exchanger inlet, at least one sixth control valve connected to the heat exchanger outlet, at least one cold working medium storage station connected to the at least one sixth control valve, at least one working medium delivery pump connected to the at least one cold working medium storage station, and at least one seventh control valve connected to the at least one working medium delivery pump and the photo-thermal collector, respectively.
As mentioned above, the photothermal heat collection unit further includes at least one eighth control valve connected to the photothermal heat collector and the at least one cold working medium storage station, respectively, and at least one ninth control valve connected to the heat exchanger and the at least one working medium delivery pump, respectively.
As previously described, the sixth control valve, the seventh control valve, the eighth control valve, and the ninth control valve are all regulator valves.
As mentioned above, the photo-thermal collector adopts a trough photo-thermal collector; or,
the photo-thermal collector adopts a tower-type photo-thermal collector.
As mentioned above, the thermal storage working medium is thermal storage oil; or,
the heat storage working medium is molten salt.
As previously mentioned, the temperature of the superheated steam is greater than 320 ℃.
As mentioned above, the heat exchanger is a tube heat exchanger; or,
the heat exchanger adopts a plate heat exchanger; or,
the heat exchanger is an evaporative heat exchanger.
By means of the technical scheme, the photo-thermal and thermal-electric combined power generation and heating system with the energy storage and peak regulation functions at least has the following advantages:
through setting up the heat supply network heater, thermal power generating unit, light and heat thermal-arrest group, can realize utilizing current thermal power equipment, carry thermal power thermodynamic system with the heat energy that light and heat produced, need not light and heat investment construction power generation facility, thereby realize the electricity generation and the heat supply of light and heat equipment, and power generation facility's thermoelectric decoupling, and combine thermal power's heat supply and light and heat, release thermoelectric unit's that can be nimble electricity generation and the binding of heat supply, thereby certain realization thermoelectric unit's thermoelectric decoupling zero, increase the flexibility of dispatch and the ability of degree of depth peak regulation.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a photo-thermal and thermal-electric combined power generation and heating system with an energy storage and peak regulation function.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments, and the directions of arrows in the drawings are the power supply direction and the heat supply direction.
As shown in fig. 1, an embodiment of the present invention provides a photothermal and thermoelectrical combined power generation and heating system with energy storage and peak shaving functions, which includes: the system comprises a heat supply network heater 10, a thermal power generating unit 20 and a photo-thermal heat collection unit 30.
As shown in fig. 1, the heat supply network heater 10 is connected to a heat supply network water supply device 101 and a heat supply network water return device 102 respectively.
As shown in fig. 1, the thermal power generating unit 20 includes a boiler 201, a steam turbine 202 connected to the boiler 201, a condensing unit 203 connected to the steam turbine 202, and a heater unit 204 connected to the steam turbine 202 and the condensing unit 203, respectively; the steam turbine 202 comprises a high-pressure turbine cylinder 2021, a medium-pressure turbine cylinder 2022 and a low-pressure turbine cylinder 2023 which are both connected to the boiler 201, specifically, a superheated steam outlet of the boiler 201 is connected to an inlet of the high-pressure turbine cylinder 2021, a reheater inlet of the boiler 201 is connected to a steam exhaust port of the high-pressure turbine cylinder 2021, a reheater outlet of the boiler 201 is connected to an inlet of the medium-pressure turbine cylinder 2022, a steam exhaust port of the medium-pressure turbine cylinder 2022 is connected to one end of a first control valve 205, the other end of the first control valve 205 is connected to an inlet of the low-pressure turbine cylinder 2023, a steam exhaust port of the medium-pressure turbine cylinder 2022 is connected to one end of a second control valve 206, and the other end of the second control valve 206 is connected to an inlet of a heat network heater 10; the condensing unit 203 includes a condenser 2031 connected to the turbine low pressure cylinder 2023 and a condensate pump 2032 connected to the condenser 2031, and an inlet of the condensate pump 2032 is connected to the condenser 2031; the heater unit 204 includes a water feed pump 2041, a low-pressure heater 2042 connected to an outlet of the condensate pump 2032, a deaerator 2043 connected to the low-pressure heater 2042 and the water feed pump 2041, respectively, and a high-pressure heater group 2044; one end of the high-pressure heater group 2044 is connected to the feed water pump 2041, and the other end of the high-pressure heater group 2044 is connected to the inlet of the boiler 201; the high-pressure heater group 2044 comprises three high-pressure heaters 20441 which are connected in series, steam extraction of the steam turbine high-pressure cylinder 2021 is respectively connected with the two high-pressure heaters 20441, steam extraction of the steam turbine intermediate-pressure cylinder 2022 is respectively connected with one high-pressure heater 20441 and the deaerator 2043, and steam extraction of the steam turbine low-pressure cylinder 2023 is connected with the low-pressure heater 2042. Through the connection mode, the power generation and heat supply of the conventional thermal power plant can be realized.
Under the condition that thermal power generation normally operates, steam generated by a boiler enters a high-pressure cylinder of a steam turbine to do work, then returns to the boiler to reheat and absorb heat, the reheated steam after absorbing heat enters a middle-pressure cylinder of the steam turbine to do work, one path of the steam after doing work enters a low-pressure cylinder of the steam turbine to do work, then the steam becomes condensed water, then the condensed water enters the boiler through a condenser, a condensed water pump, a low-pressure heater, a deaerator and a high-pressure heater group to absorb heat and becomes new steam again, the other path of the steam enters a heating network heater to supply heat, and power generation and heat supply of conventional thermal power generation are achieved. In the invention, the steam turbine comprises a heating unit with any capacity grade of 100MW grade, 200MW grade, 300MW grade, 600MW grade and 1000MW grade and a thermodynamic system thereof. The heat supply of the thermal power generating unit comprises a heating system with any pressure and temperature grade of 0.2-0.9 MPa.
As shown in fig. 1, the photothermal collection group 30 includes a photothermal collector 301 and a heat exchanger 302; an inlet of the heat exchanger 302 is connected to one end of a third control valve 303, the other end of the third control valve 303 is connected to an outlet of the condensate pump 2032, the outlet of the heat exchanger 302 is connected to the network heater 10 through a fourth control valve 304 and a second control valve 206, the outlet of the heat exchanger 302 is connected to the inlet of the turbine low-pressure cylinder 2023 via a fourth control valve 304 and a first control valve 205, an inlet of the heat exchanger 302 is connected to one end of a fifth control valve 305, the other end of the fifth control valve 305 is connected to the condenser 2031, the connection mode realizes transmission and conversion of heat generated by the photo-thermal heat collection unit to the thermal power unit and realizes power generation and heat supply of the photo-thermal heat collection equipment by using the thermal power unit equipment, specifically, an outlet of the heat exchanger 302 is connected with one end of the fourth control valve 304, and the other end of the fourth control valve 304 is connected with one end of the first control valve 205 and one end of the second control valve 206 respectively.
As shown in fig. 1, a heat storage working medium is disposed in the photo-thermal collector 301, the photo-thermal collection group 30 further includes at least one hot working medium storage station 306 connected to inlets of the photo-thermal collector 301 and the heat exchanger 302, at least one sixth control valve 307 connected to an outlet of the heat exchanger 302, at least one cold working medium storage station 308 connected to the at least one sixth control valve 307, at least one working medium delivery pump 309 connected to the at least one cold working medium storage station 308, and at least one seventh control valve 310 connected to the at least one working medium delivery pump 309 and the photo-thermal collector 301. When there is illumination in the daytime, the photothermal heat collector 301 absorbs energy generated by the sun and transmits the energy to the heat storage working medium, the heat storage working medium becomes a thermal working medium, and the control by the sixth control valve and the seventh control valve realizes the storage and transmission cycle of the photothermal storage working medium from the photothermal heat collector, the thermal working medium storage station, the heat exchanger, the cold working medium storage station, the working medium delivery pump and the photothermal heat collector, and also realizes the generation and transmission of photothermal heat collection. The storage and conveying circulation type of the hot and cold working medium is not limited to the circulation formed by the connection of the type, and working medium circulation formed by deformation of other types can be adopted.
When the sun shines, the photo-thermal heat collector 301 absorbs the energy generated by the sun, and transmits the energy to the thermal storage working medium flowing through the photo-thermal heat collector 301 to change the thermal storage working medium into the thermal working medium, the thermal working medium enters the thermal working medium storage station 306 and also enters the heat exchanger 302, the heat is transmitted to the condensed water at the outlet of the condensed water pump 2032 of the thermal power generating unit in the heat exchanger 302, the condensed water is heated to the superheated steam, and the superheated steam enters the low-pressure cylinder 2023 of the steam turbine to drive the rotor of the rotating machine to do work, so that the generator is driven to generate electricity. Wherein the control of the energy exchange in the heat exchanger 302 is achieved by the sixth control valve 307 regulating the flow of working fluid in the hot working fluid storage station 306 and the cold working fluid storage station 308.
Further, the photo-thermal heat collector 301 absorbs energy generated by the sun and transmits the energy to the thermal storage working medium, the thermal storage working medium is changed into a hot working medium, and the temperature of the hot working medium is more than 350 ℃; the condensed water at the outlet of the condensed water pump 2032 needs to be heated to superheated steam, the temperature and the pressure of the superheated steam need to be matched with those of steam at the inlet of the steam turbine low-pressure cylinder 2023, the temperature is generally higher than 320 ℃, the pressure is between 0.25 and 0.8MPa, the pressure is adjusted through a fourth control valve, and the temperature is adjusted through a sixth control valve.
When the thermal power generating unit needs to supply heat, the heat supply of the photo-thermal heat collecting unit can be realized through the control of the fourth control valve and the first control valve except for a conventional thermal power generating unit heat supply method that the steam outlet of the steam turbine intermediate pressure cylinder 2022 enters the heat supply network heater 10 to heat the heat supply network water. Meanwhile, the control proportion of the first control valve, the second control valve and the fourth control valve is adjusted, so that conversion between the power generation load and the heat supply load of the thermal power generating unit and the photo-thermal heat collection unit can be realized.
In the invention, the occupied area of the mirror field of the photo-thermal heat collector 301 is about 1.5km 2 The condensing area is about 50 ten thousand square meters, the configured heat storage time can be 6 hours, the absorbed solar energy is transmitted to a heat storage working medium, the heat storage working medium heats condensed water of about 200t/h to superheated steam with the temperature of 370 ℃ and the pressure of 0.8MPa, about 40MW of electric quantity can be generated on a thermal power generating unit, about 150MW of heat supply capacity is provided, the reduced heat supply capacity is 230 GJ/year, the heat supply area is about 270 ten thousand square meters, and the thermoelectric decoupling capacity of the thermal power generating unit is increased by about 60 MW.
As shown in fig. 1, further, the photothermal heat collection unit 30 further includes at least one eighth control valve 311 connected to the photothermal heat collector 301 and the at least one cold working medium storage station 308, and at least one ninth control valve 312 connected to the heat exchanger 302 and the at least one working medium delivery pump 309, respectively, when there is no illumination at night, the photothermal heat collector cannot absorb the energy generated by the sun and transfers the energy to the heat storage working medium, the heat storage working medium becomes the cold working medium, and the control of the eighth control valve and the ninth control valve realizes the storage and delivery cycle of the heat storage working medium from the photothermal heat collector, the cold working medium storage station, the working medium delivery pump, the heat exchanger, the hot working medium storage station, and the photothermal heat collector. The connection mode is controlled by the fourth control valve and the fifth control valve, heat generated by the thermal power generating unit can be stored in the working medium storage station of the photo-thermal heat collection unit, and the heat in the working medium storage station can be transmitted to the thermal power generating unit.
At night, because the heat storage working medium in the photo-thermal heat collector has the heat storage capacity, the thermal generator set can utilize the heat storage working medium to store energy in power generation. When the thermal power generating unit needs peak shaving, the thermal power generating unit can open the fourth control valve 304, heat of thermal power steam is transferred to a heat storage working medium of the photo-thermal heat collection unit through the heat exchanger 302, the steam is cooled by the heat exchanger 302 and then becomes condensed water, and the condensed water passes through the fifth control valve and enters the condenser 2031 to complete thermodynamic cycle; the heat storage working medium of the photo-thermal heat collection set is stored and conveyed in circulation through the photo-thermal heat collector 301, the cold working medium storage station 308, the working medium conveying pump 309, the heat exchanger 302, the hot working medium storage station 306 and the photo-thermal heat collector 301, and the cold working medium of the cold working medium storage station 308 is heated into the hot working medium through the heat exchanger 302 and is stored in the hot working medium storage station 306. When the thermal power generation requires an electric load, the system can convert the stored thermal energy into electric power by the reverse process. Therefore, the energy storage function of the photo-thermal system is utilized, and the power supply and reduction of the thermal power generating unit are completed. By the same token, the regulation of the thermal load can also be effected as required by the thermal load by opening and closing the second control valve.
Further, the photo-thermal collector 301 adopts a trough type photo-thermal collector; alternatively, the photothermal heat collector 301 is a tower-type photothermal heat collector.
Further, the heat storage working medium is heat storage oil; or the heat storage working medium is molten salt.
Further, the heat exchanger 302 is a tube heat exchanger; alternatively, the heat exchanger 302 is a plate heat exchanger; alternatively, the heat exchanger 302 may be an evaporative heat exchanger, although other heat exchangers may be used, and the invention is not limited in this respect.
Further, in the present invention, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve, the seventh control valve, the eighth control valve, and the ninth control valve are all control valves. Of course, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve, the seventh control valve, the eighth control valve, and the ninth control valve may also be stop valves or other control valves, which is not limited in this embodiment of the present invention.
The photo-thermal and thermal power combined power generation and heating system with the energy storage and peak regulation functions is characterized in that when an electric load needs to be increased in the daytime, steam generated by thermal power and steam generated by photo-thermal power simultaneously enter the low-pressure cylinder of the steam turbine to do work and generate power by adjusting the first control valve at the inlet of the low-pressure cylinder of the steam turbine; when the heat load needs to be increased, the thermal power and the photo-thermal heat are simultaneously supplied through the second control valve at the inlet of the heat supply network heater. In the dynamic adjustment process, the thermal power can be increased or reduced in load by adjusting thermal power and thermal heat supply distribution, the heat supply amount is increased, and the power generation amount is reduced.
The photo-thermal and thermal power combined power generation and heating system with the energy storage and peak regulation functions is used for storing energy at night, and the thermal storage working medium of the photo-thermal heat collector has heat storage capacity, so that the thermal power generation unit can store the energy by utilizing the thermal storage working medium of the photo-thermal heat collector. When the thermal power generating unit needs to adjust the peak, the system can transfer and store the heat generated by the thermal power generating unit in the thermal working medium storage station through the heat exchanger, and when the power system needs the electric load, the system can release the heat in the thermal working medium storage station to the low-pressure cylinder of the steam turbine through the heat exchanger, so that the peak adjustment requirement of the electric load of the thermal power generating unit is met; similarly, when the thermal load of the system is reduced, the system can transfer and store the heat generated by the thermal power generating unit in the thermal working medium storage station through the heat exchanger, when the thermal load is increased, the system can release the heat in the thermal working medium storage station to the heat exchanger of the thermal power generating thermodynamic system through the heat exchanger, and the electric load does not need to be synchronously increased, so that the thermoelectric decoupling is realized.
According to the embodiment of the photo-thermal and thermal-electric combined power generation and heating system with the energy storage and peak regulation functions, the heat supply network heater, the thermal power generating unit and the photo-thermal heat collection unit are arranged, the existing thermal power generation equipment can be utilized, the heat energy generated by photo-thermal is transmitted to the thermal power generation thermodynamic system, the thermal power generation equipment is not required to be built by photo-thermal investment, the power generation and heat supply of the photo-thermal equipment and the thermoelectric decoupling of the power generation equipment are realized, the heat supply of the thermal power generation is combined with the photo-thermal, the binding of the power generation and the heat supply of the thermal power generating unit can be flexibly released, the thermoelectric decoupling of the thermal power generating unit is realized to a certain extent, and the scheduling flexibility and the deep peak regulation capability are increased.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a light and heat and thermoelectricity combined power generation and heating system with energy storage peak shaving function which characterized in that: it includes:
a heat supply network heater;
the thermal power generating unit comprises a boiler, a steam turbine connected with the boiler, a condensation unit connected with the steam turbine, and heater units respectively connected with the steam turbine and the condensation unit; the steam turbine comprises a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder which are connected with the boiler, a steam exhaust port of the steam turbine intermediate-pressure cylinder is connected with an inlet of the steam turbine low-pressure cylinder through a first control valve, a steam exhaust port of the steam turbine intermediate-pressure cylinder is connected with an inlet of the heat supply network heater through a second control valve, and the condensation unit comprises a condenser and a condensate pump connected with the condenser; when the thermal power generating unit normally operates, steam generated by the boiler enters a high-pressure cylinder of the steam turbine to do work, then returns to the boiler to be reheated and absorb heat, the reheated steam after absorbing heat enters a medium-pressure cylinder of the steam turbine to do work, one path of the steam after doing work enters a low-pressure cylinder of the steam turbine to do work to become condensed water, then enters the boiler to absorb heat to become new steam again after passing through a condensation unit and a heater unit in sequence, and the other path of the steam enters a heating network heater to supply heat, so that power generation and heat supply of a conventional thermal power plant are realized;
the photo-thermal heat collection group comprises a photo-thermal heat collector and a heat exchanger; an inlet of the heat exchanger is connected with an outlet of the condensate pump through a third control valve, an outlet of the heat exchanger is connected with an inlet of a low-pressure cylinder of the steam turbine through a fourth control valve and a first control valve, an outlet of the heat exchanger is connected with the heat supply network heater through a fourth control valve and a second control valve, an inlet of the heat exchanger is connected with the condenser through a fifth control valve, and the thermal power unit realizes peak load regulation of the thermal power unit through the control of the fourth control valve and the fifth control valve; the photo-thermal collector is internally provided with a heat storage working medium, and the photo-thermal collection set is used for conveying the heat storage working medium from the photo-thermal collector to the heat exchanger and then conveying the heat storage working medium from the heat exchanger to the photo-thermal collector to realize the storage and conveying circulation of a hot and cold working medium or a cold and hot working medium of the heat storage working medium;
the photothermal heat collector conveys a heat storage working medium to the heat exchanger, the heat exchanger heats the condensed water at the outlet of the condensed water pump to superheated steam matched with the temperature and the pressure of steam at the inlet of the low-pressure cylinder of the steam turbine through the superheated working medium, the superheated steam respectively enters the low-pressure cylinder of the steam turbine and the heating network heater to realize the power generation and heat supply of the photothermal heat collecting equipment, and the simultaneous power generation and the simultaneous heat supply of the thermal power generating unit and the photothermal heat collecting unit are realized through the control of the first control valve, the second control valve, the third control valve and the fourth control valve.
2. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 1,
the superheated steam outlet of the boiler is connected with the inlet of the high-pressure cylinder of the steam turbine, the reheater inlet of the boiler is connected with the steam outlet of the high-pressure cylinder of the steam turbine, the outlet of the reheater of the boiler is connected with the inlet of the medium-pressure cylinder of the steam turbine, and the steam outlet of the low-pressure cylinder of the steam turbine is connected with the condenser;
the heater unit comprises a water feeding pump, a low-pressure heater connected with an outlet of the condensate pump, a deaerator and a high-pressure heater group which are respectively connected with the low-pressure heater and the water feeding pump; one end of the high-pressure heater group is connected with the feed pump, and the other end of the high-pressure heater group is connected with the boiler inlet; the high-pressure heater group comprises three high-pressure heaters which are connected in series, the steam extraction of the high-pressure cylinder of the steam turbine is respectively connected with the two high-pressure heaters, the steam extraction of the medium-pressure cylinder of the steam turbine is respectively connected with one high-pressure heater and the deaerator, and the steam extraction of the low-pressure cylinder of the steam turbine is connected with the low-pressure heater.
3. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 1,
the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve are all regulating valves.
4. The photo-thermal and thermal-electric combined power generation and heating system with the energy storage and peak shaving functions as claimed in claim 1,
the photo-thermal heat collection unit further comprises at least one hot working medium storage station connected with the photo-thermal heat collector and the heat exchanger inlet respectively, at least one sixth control valve connected with the heat exchanger outlet, at least one cold working medium storage station connected with the at least one sixth control valve, at least one working medium conveying pump connected with the at least one cold working medium storage station, and at least one seventh control valve connected with the at least one working medium conveying pump and the photo-thermal heat collector respectively.
5. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 4,
the photo-thermal heat collection unit further comprises at least one eighth control valve and at least one ninth control valve, the eighth control valve is respectively connected with the photo-thermal heat collector and the at least one cold working medium storage station, and the ninth control valve is respectively connected with the heat exchanger and the at least one working medium delivery pump.
6. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 5,
the sixth control valve, the seventh control valve, the eighth control valve and the ninth control valve are all regulating valves.
7. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 1,
the photo-thermal collector adopts a groove type photo-thermal collector; or,
the photo-thermal collector adopts a tower-type photo-thermal collector.
8. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 1,
the heat storage working medium is heat storage oil; or,
the heat storage working medium is molten salt.
9. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 1,
the temperature of the superheated steam is greater than 320 ℃.
10. The combined photo-thermal and thermal-electric power generation and heating system with an energy storage and peak shaving function according to claim 1,
the heat exchanger adopts a tubular heat exchanger; or,
the heat exchanger adopts a plate heat exchanger; or,
the heat exchanger is an evaporative heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210268125.7A CN114934826A (en) | 2022-03-18 | 2022-03-18 | Photo-thermal and thermal power combined power generation and heating system with energy storage and peak regulation functions |
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| CN202210268125.7A CN114934826A (en) | 2022-03-18 | 2022-03-18 | Photo-thermal and thermal power combined power generation and heating system with energy storage and peak regulation functions |
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| CN (1) | CN114934826A (en) |
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