CN114753898A - Reheating thermal power generating unit and photo-thermal combined power generation and steam supply system with peak regulation and energy storage functions - Google Patents
Reheating thermal power generating unit and photo-thermal combined power generation and steam supply system with peak regulation and energy storage functions Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 72
- 238000003303 reheating Methods 0.000 title claims abstract description 27
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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
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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
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- 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
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- F03G6/00—Devices for producing mechanical power from solar energy
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Abstract
The invention discloses a reheating thermal power generating unit with peak regulation and energy storage functions and a photo-thermal combined power generation and steam supply system, which mainly adopts the technical scheme that a temperature and pressure reduction steam supply device 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 heater unit includes a feed pump; the photo-thermal heat collection group comprises a photo-thermal heat collector and a steam generator; the inlet of the steam generator is connected with the water feeding pump through a third control valve, the outlet of the steam generator is connected with the steam exhaust port of the high-pressure cylinder of the steam turbine through a fourth control valve and a first control valve, the outlet of the steam generator is connected with the steam supply device through the fourth control valve and a second control valve and subjected to temperature reduction and pressure reduction, the top outlet of the steam generator is connected with the inlet of the medium-pressure cylinder of the steam turbine through a fifth control valve, and the lower outlet of the steam generator is connected with the condensing unit through a sixth control valve.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a reheating thermal power generating unit with a peak regulation energy storage function and a photo-thermal combined power generation and steam supply system.
Background
In recent years, new energy power generation is rapidly increased, but the development of new energy is influenced by higher investment cost, particularly, the investment cost of photo-thermal power generation is higher compared with wind power generation and photovoltaic power generation; meanwhile, the new energy power generation is limited by natural conditions, and the power generation of the new energy power generation also causes impact to the power grid to different degrees. Therefore, the development of industrialization is severely restricted.
The existing thermal power generation equipment is combined with the heat energy generated by the photo-thermal power generation equipment, so that the investment cost of the photo-thermal power generation can be reduced undoubtedly, and the industrialization and the development of the photo-thermal power generation equipment are promoted.
Meanwhile, when the power generation and heat supply of thermal power generation are combined with photo-thermal power generation, the complementation of thermal power generation, photo-thermal power generation and heat supply can be realized, and the problem of instability of new energy power generation is solved. The mode can release the binding of power generation and heat supply of the thermoelectric generating set to a certain degree, thereby realizing thermoelectric decoupling of the thermoelectric generating set to a certain degree and increasing the scheduling flexibility and the deep peak regulation capability.
The reheating thermal power generating unit has higher proportion in the thermal power generating unit, combines the photo-thermal power generation with the power generation and heat supply of the reheating thermal power generating unit, and undoubtedly has wide prospect.
Disclosure of Invention
In view of the above, the invention provides a reheating thermal power generating unit and photo-thermal combined power generation and steam supply system with a peak regulation and energy storage function, and mainly aims to solve the problem of unstable new energy power generation and realize complementation of thermal power generation, photo-thermal power generation and heat supply and peak regulation and thermoelectric decoupling of the thermal power generating unit.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a reheating thermal power generating unit and photo-thermal combined power generation and steam supply system with peak regulation and energy storage functions. It includes:
a temperature and pressure reducing steam supply device;
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 and a steam turbine intermediate-pressure cylinder which are both connected with the boiler, and the steam turbine high-pressure cylinder is connected with the temperature and pressure reducing steam supply device through a first control valve and a second control valve; when the thermal power generating unit normally operates, steam generated by the boiler enters a high-pressure cylinder of a steam turbine to do work, wherein one path of the steam returns to the boiler to reheat and absorb heat, the reheated steam after absorbing heat enters 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, and the other path of the steam enters a temperature-reducing and pressure-reducing steam supply device to supply heat to the outside, so that power generation and heat supply of a conventional thermal power plant are realized; the heater unit includes a feed pump;
the photo-thermal heat collection group comprises a photo-thermal heat collector and a steam generator; an inlet of the steam generator is connected with the feed pump through a third control valve, an outlet of the steam generator is connected with a steam outlet of a high-pressure cylinder of the steam turbine through a fourth control valve and a first control valve, an outlet of the steam generator is connected with the temperature and pressure reducing steam supply device through a fourth control valve and a second control valve, an outlet of the top of the steam generator is connected with an inlet of a medium-pressure cylinder of the steam turbine through a fifth control valve, an outlet of the lower part of the steam generator is connected with the condensation unit through a sixth control valve, and the thermal power unit realizes peak load regulation of the thermal power unit through the fifth control valve and the sixth control valve; the solar heat collector is internally provided with a heat storage working medium, the solar heat collection set is used for conveying the heat storage working medium from the solar heat collector to the steam generator, and then conveying the heat storage working medium from the steam generator to the solar heat collector to realize the storage and conveying circulation of hot and cold working mediums or cold and hot working mediums of the heat storage working medium and realize the energy transfer and storage of the thermal power generating unit to the solar heat collection set;
the photo-thermal collector conveys heat storage working medium to the steam generator, the steam generator heats the feed water conveyed by the feed water pump through the thermal working medium to the steam pressure and the temperature which are the same as the steam at the steam outlet of the high-pressure cylinder of the steam turbine or the steam inlet of the medium-pressure cylinder of the steam turbine, the power generation, the heat supply and the steam supply of the photo-thermal collector group are realized, and the simultaneous heat supply or the independent heat supply of the thermal power unit and the photo-thermal collector group are realized through the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve.
As before, the steam turbine still includes the low pressure jar of steam turbine, the superheated steam export of boiler with steam turbine high pressure jar entry linkage, the reheater entry of boiler with steam turbine high pressure jar steam exhaust mouth is connected, the boiler reheater export with steam turbine intermediate pressure jar is connected, steam turbine intermediate pressure jar export with steam turbine low pressure jar entry linkage, steam turbine low pressure jar with the unit connection that condenses.
As mentioned above, the condensing unit includes a condenser and a condensate pump connected to the low pressure cylinder of the steam turbine, an inlet of the condensate pump is connected to the condenser, and an outlet of the condensate pump is connected to an outlet at the lower part of the steam generator through a sixth control valve;
the heater unit also comprises a low-pressure heater connected with 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 mentioned, the steam generator includes a heat exchanger.
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 respectively, at least one seventh control valve connected with the heat exchanger, at least one cold working medium storage station connected with the at least one seventh control valve, at least one working medium conveying pump connected with the at least one cold working medium storage station, and at least one eighth control valve connected with the at least one working medium conveying pump and the photo-thermal heat collector respectively.
As mentioned above, the photothermal heat collection unit further includes at least one ninth control valve connected to the photothermal heat collector and the at least one cold medium storage station, respectively, and at least one tenth control valve connected to the heat exchanger and the transfer pump, respectively.
As mentioned above, the photo-thermal collector adopts a trough photo-thermal collector; alternatively, the first and second electrodes may be,
the photo-thermal collector adopts a tower-type photo-thermal collector.
As mentioned above, the thermal storage working medium is thermal storage oil; alternatively, the first and second liquid crystal display panels may be,
the heat storage working medium is molten salt.
As mentioned previously, the hot working fluid temperature of the heat storage working fluid is greater than 350 ℃.
As described above, the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, and the sixth control valve are all regulating valves.
As previously described, the seventh control valve, the eighth control valve, the ninth control valve, and the tenth control valve are all regulator valves.
By means of the technical scheme, the reheating thermal power generating unit with the peak regulation and energy storage functions and the photo-thermal combined power generation and steam supply system at least have the following advantages:
the reheating thermal power generating unit with the peak regulation and energy storage functions and the photo-thermal combined power generation and steam supply system can convert energy generated by the photo-thermal heat collection set into electric energy and heat supply heat energy by arranging the temperature reduction and pressure reduction steam supply device, the thermal power generating unit and the photo-thermal heat collection set through utilizing the conventional thermal power generating equipment, namely the heat energy generated by the photo-thermal heat collection set is transmitted to the thermal power generation, and the power generating equipment is not required to be built by photo-thermal investment, so that the power generation and heat supply of the photo-thermal equipment are realized, the investment cost of the photo-thermal power generation is effectively reduced, the instability problem of new energy power generation is solved, and the photo-thermal heat supply can also be realized by utilizing the thermal power supply; the thermal power generating unit and the photo-thermal heat collection unit can generate electricity and supply heat complementarily, and meanwhile peak regulation and thermoelectric decoupling of the thermal power generating unit can be achieved to a certain degree.
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 reheating thermal power generating unit with peak regulation and energy storage functions and a photo-thermal combined power generation and steam supply system.
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 reheat thermal power generating unit with peak shaving energy storage function and a photo-thermal combined power generation and steam supply system, which includes: the system comprises a temperature-reducing pressure-reducing steam supply device 10, a thermal power generating unit 20 and a photo-thermal heat collection unit 30.
As shown in fig. 1, the attemperation and pressure reduction steam supply device 10 includes an attemperation and pressure reduction device 101.
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 and a medium-pressure turbine cylinder 2022 which are both connected with the boiler 201, and the steam outlet of the high-pressure turbine cylinder 2021 is connected with the temperature and pressure reducing steam supply device 10 through a first control valve 205 and a second control valve 206; specifically, the steam outlet of the steam turbine high-pressure cylinder 2021 is connected to one end of a first control valve 205, the other end of the first control valve 205 is connected to one end of a second control valve 206, and the other end of the second control valve 206 is connected to the temperature and pressure reducer 101. The steam turbine 202 further comprises a low-pressure turbine cylinder 2023, an outlet of superheated steam of the boiler 201 is connected with an inlet of the high-pressure turbine cylinder 2021, an inlet of a reheater of the boiler 201 is connected with a steam exhaust of the high-pressure turbine cylinder 2021, an outlet of the reheater of the boiler 201 is connected with an inlet of a medium-pressure turbine cylinder 2022, an outlet of the medium-pressure turbine cylinder 2022 is connected with an inlet of the low-pressure turbine cylinder 2023, the condensing unit 203 comprises a condenser 2031 and a condensate pump 2032 which are connected with the low-pressure turbine cylinder 2023, and an inlet of the condensate pump 2032 is connected with the condenser 2031; the heater unit 204 comprises a water feed pump 2041, a low-pressure heater 2042 connected with the condensate pump 2032, a deaerator 2043 respectively connected with the low-pressure heater 2042 and the water feed pump 2041, and a high-pressure heater group 2044; one end of the high-pressure heater group 2044 is connected to the feed 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. Under the condition that thermal power generation normally operates, steam generated by a boiler enters a steam turbine high-pressure cylinder to do work, then returns to the boiler to reheat and absorb heat all the way, the reheated steam after absorbing heat enters a steam turbine intermediate pressure cylinder and a steam turbine low-pressure cylinder to do work, then becomes condensed water, enters the boiler to absorb heat through a condenser, a condensed water pump, a low-pressure heater, a deaerator and a high-pressure heater, becomes new steam again, and enters a temperature-reducing and pressure-reducing steam supply device to supply heat to the outside all the way. In the invention, the steam turbine comprises a thermal reheating power generation (heat supply) unit with capacity of any grade of 100MW grade, 200MW grade, 300MW grade, 600MW grade and 1000MW grade and a thermodynamic system thereof, in particular to a subcritical reheating power generation (industrial) steam supply system with 300MW grade and 600MW grade. The steam supply of the thermal power generating unit comprises a steam supply system with any pressure and temperature grade of 1-3MPa, in particular to an industrial steam supply system with the pressure grade of 1-1.5MPa and the temperature of 250-.
As shown in fig. 1, the photothermal heat collection unit 30 includes a photothermal heat collector 301 and a steam generator 302; an inlet of the steam generator 302 is connected with the water feeding pump 2041 through a third control valve 303, an outlet of the steam generator 32 is connected with a steam exhaust port of the steam turbine high-pressure cylinder 221 through a fourth control valve 304 and a first control valve 205, an outlet of the steam generator 302 is connected with the temperature and pressure reducing steam supply device 101 through the fourth control valve 304 and a second control valve 206, steam supply of heat generated by photo-thermal heat collection to a thermal power unit is achieved, and power generation and heat supply of the photo-thermal heat collection unit can be achieved by using a reheat thermal power unit; specifically, in the present invention, the water feed pump 2041 includes a water feed pump tap, an inlet of the steam generator 302 is connected to one end of a third control valve 303, the other end of the third control valve 303 is connected to the water feed pump tap, an outlet of the steam generator 302 is connected to one end of a fourth control valve 304, and the other end of the fourth control valve 304 is connected to the other end of the first control valve and one end of the second control valve, respectively. The superheated steam outlet of the steam generator 302 is connected with the inlet of the steam turbine intermediate pressure cylinder 2022 through the fifth control valve 305, so that the heat generated by photo-thermal heat collection can be transferred to the thermoelectric generator set and power generation can be realized, specifically, the superheated steam outlet of the steam generator 302 is connected with one end of the fifth control valve, and the other end of the fifth control valve is connected with the inlet of the steam turbine intermediate pressure cylinder 2022.
As shown in fig. 1, the steam generator 302 includes a heat exchanger 3021, in the present invention, the heat exchanger 3021 may be any type of heat exchanger, the photothermal collection unit 30 further includes at least one hot working medium storage station 307 connected to the photothermal collector 301 and the heat exchanger 3021, at least one seventh control valve 308 connected to the heat exchanger 3021, at least one cold working medium storage station 309 connected to the at least one seventh control valve 308, at least one working medium delivery pump 310 connected to the at least one cold working medium storage station 309, at least one eighth control valve 311 connected to the at least one working medium delivery pump 310 and the photothermal collector 301, respectively, a heat storage working medium is disposed in the photothermal collector 301, and when light is emitted during the day, the photothermal collector 301 absorbs the energy generated by the sun and transfers the energy to the heat storage working medium, the heat storage working medium is changed into the hot working medium, the heat storage working medium is stored and conveyed from the photo-thermal heat collector, the hot working medium storage station, the steam generator, the cold working medium storage station, the working medium conveying pump and the photo-thermal heat collector through the control of the seventh control valve and the eighth control valve, and the generation and the transmission of photo-thermal heat collection are also realized.
When the sun shines, the light and heat collector absorbs the energy that the sun produced, and give the heat storage working medium of light and heat collector with this energy transmission, the heat storage working medium becomes hot working medium and enters into hot working medium storage station, then also enters into steam generator, give the feedwater of water-feeding pump with heat transfer in steam generator, heat this feedwater to with the superheated steam of steam turbine intermediate pressure cylinder entry looks homothermal temperature and pressure, superheated steam enters into the steam turbine intermediate pressure cylinder and drives the rotary machine rotor and do work, thereby drive the generator electricity generation. The control of energy exchange in the steam generator is realized by regulating the flow of working media of the hot working medium storage station and the cold working medium storage station by a seventh control valve; or, another power generation type is that the feed water is heated to superheated steam with the same temperature and pressure as the steam outlet of the high-pressure cylinder of the steam turbine, the superheated steam enters a reheater of the boiler, and the reheater heats the cold-stage steam to hot-stage steam and the hot-stage steam enters the intermediate pressure cylinder of the steam turbine to drive the rotary mechanical rotor to do work, so as to drive the generator to generate power. The control of the energy exchange in the steam generator is realized by regulating the flow of working media of the hot working medium storage station and the cold working medium storage station by a seventh control valve. Specifically, when the steam generated by the photothermal heat collection group is used for generating electricity, on one hand, the steam generator can heat and adjust steam parameters to the same pressure and temperature as the inlet of the intermediate pressure cylinder of the steam turbine, and on the other hand, the steam generator can also heat and adjust steam parameters to the same pressure and temperature as the outlet of the high pressure cylinder, in this case, the steam flow can be limited because the steam needs to enter the boiler reheater.
Further, the photo-thermal heat collector 301 absorbs energy generated by the sun and transmits the energy to the thermal storage working medium, wherein the temperature of the thermal working medium of the thermal storage working medium is more than 350 ℃; the tap water of the water feeding pump body is heated until the superheated steam is matched with the steam temperature and pressure of the steam discharged by the steam inlet of the steam turbine intermediate pressure cylinder or the steam discharged by the steam turbine high pressure cylinder, generally, the steam temperature of the hot section of the subcritical reheating unit is 535 ℃, the pressure is 3-4MPa, the steam temperature of the cold section is 320 ℃, the pressure is 3-4MPa, the pressure is adjusted through a third control valve, and the temperature is adjusted through a seventh control valve. When the thermal power generating unit needs to supply heat, the conventional thermal power generating unit heat supply method is that steam discharged by a high-pressure cylinder of a steam turbine enters a temperature and pressure reducing device for supplying heat, when the sunlight is sufficient and the photothermal system needs to supply heat, a thermal working medium of the photothermal system enters a steam generator, heat is transferred to feed water tapped by a feed water pump of the thermal power generating unit in the steam generator, the feed water is heated to superheated steam with the same temperature and pressure as the steam outlet of the high-pressure cylinder of the steam turbine, and the superheated steam enters the temperature and pressure reducing device through a second control valve, so that the heat supply of the photothermal system is realized.
Further, the photo-thermal heat collector absorbs energy generated by the sun and transmits the energy to the heat storage working medium, and the temperature of the hot working medium of the heat storage working medium is more than 350 ℃; the tap water of the water feeding pump body is heated to superheated steam, the temperature and the pressure of the superheated steam are matched with those of steam at a steam outlet of a high-pressure cylinder, the temperature of a common subcritical reheating unit is 370 ℃, the pressure of the subcritical reheating unit is 3-4MPa, the pressure of the subcritical reheating unit is adjusted through a third control valve, and the temperature of the subcritical reheating unit is adjusted through a seventh control valve.
In the invention, the mirror field of the photo-thermal collector occupies about 2-3km2The light-gathering area is about 80 ten thousand square meters, the heat storage time can be 6-10 hours, the absorbed solar energy is transmitted to the heat storage working medium, the heat storage working medium heats the water supply of about 200t/h to the superheated steam with the temperature of 535 ℃ and the pressure of 2-4MPa, about 60MW of electric quantity can be generated on the thermal power generating unit, about 200MW of heat supply capacity is realized, and the heat supply capacity is reduced to more than 300 ten thousand GJ/year.
Furthermore, the 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 by adjusting the control proportion of the first control valve and the second control valve.
Further, the photo-thermal collection unit 30 further includes at least one ninth control valve 312 respectively connected to the photo-thermal collector 301 and the at least one cold working medium storage station 309, and at least one tenth control valve 313 respectively connected to the heat exchanger 3021 and the at least one working medium transfer pump 310, when there is no illumination at night, the photo-thermal collector cannot absorb energy generated by the sun and transfers the energy to the heat storage working medium, and the heat storage working medium becomes the cold working medium. The outlet at the lower part of the steam generator 302 is connected with the outlet of the condensate pump 2032 through a sixth control valve 306, and the energy transfer and storage from the thermal power generating unit to the photo-thermal system can be realized by opening the fifth control valve. Specifically, at night, because the heat transmission working medium of the photo-thermal power generation has the heat storage capacity, the thermal power generating set can store energy by utilizing the working medium of the photo-thermal power generation. When the thermal power generating unit needs peak shaving, the thermal power generating unit can open the fifth control valve, steam generated by the thermal power generating unit transfers heat to the working medium of the photo-thermal heat collection unit through the heat exchanger, the steam is cooled by the heat exchanger and then becomes condensed water, and the condensed water passes through the sixth control valve and reaches the outlet of the condensed water pump to complete thermodynamic cycle; the heat storage working medium of the photo-thermal heat collection set is heated into a hot working medium through the heat exchanger and is stored in the hot working medium storage station through the circulation of the photo-thermal heat collector, the cold working medium storage station, the working medium delivery pump, the heat exchanger, the hot working medium storage station and the photo-thermal heat collector. When the thermal power generation needs the electric load, the system can convert the stored heat energy into the steam and the electric power of the thermal power generating unit through 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. In the same way, when the heat load is required to be adjusted, the heat supply function of energy storage can be realized by opening and closing the fourth control valve according to the heat load requirement.
Further, in the invention, the photo-thermal collector adopts a trough photo-thermal collector; or the photo-thermal collector adopts a tower-type photo-thermal collector. The heat storage working medium is heat storage oil; or the heat storage working medium is molten salt.
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, the ninth control valve, and the tenth 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, the ninth control valve, and the tenth control valve may also be stop valves, which is not limited in this specific embodiment of the present invention.
The reheating thermal power generating unit with the peak regulation and energy storage functions and the photo-thermal combined power generation and steam supply system have the advantages that during daytime, when electric load needs to be increased, steam generated by thermal power and steam generated by photo-thermal heat collection enter the intermediate pressure cylinder to do work and generate power at the same time by adjusting the fifth control valve at the inlet of the intermediate pressure cylinder of the steam turbine and the seventh control valve of the photo-thermal heat collection unit; when the heat load needs to be increased, the simultaneous heat supply or the independent heat supply of thermal power and light heat is realized through the second control valve at the inlet of the temperature and pressure reducer. In the dynamic adjustment process, the thermal power can be increased or reduced by adjusting the thermal power and the thermal power supply distribution, and the generated energy is reduced while the heat supply is increased.
The reheating thermal power generating unit with the peak regulation and energy storage functions and the photo-thermal combined power generation and steam supply system have the advantages that at night, as the heat transmission working medium of the photo-thermal power generation has the heat storage capacity, the thermal power generating unit can store energy by utilizing the working medium of the photo-thermal power generation. When the thermal power generating unit needs to adjust the peak, the system can transfer and store heat generated by the thermal power generating unit in the heat storage station through the steam generator, and when the power system needs to adjust the peak, the system can release the heat in the heat storage station to the intermediate pressure cylinder of the thermal power generating unit through the heat exchanger, so that the peak adjustment requirement of the electrical load of the 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 storage station through the steam generator, when the thermal load is increased, the system can release the heat in the thermal storage station to the heat exchanger of the thermal power system through the heat exchanger, and the electric load does not need to be increased synchronously, so that the thermoelectric decoupling is realized. Therefore, heat supply of thermal power generation is combined with photo-thermal power generation, binding of power generation and heat supply of the thermoelectric unit can be released flexibly, thermoelectric decoupling of the thermoelectric unit is achieved to a certain degree, and scheduling flexibility and deep peak regulation capacity are improved.
The reheating thermal power generating unit with the peak regulation and energy storage functions and the photo-thermal combined power generation and steam supply system can convert energy generated by the photo-thermal heat collection set into electric energy and heat supply heat energy by arranging the temperature reduction and pressure reduction steam supply device, the thermal power generating unit and the photo-thermal heat collection set through utilizing the conventional thermal power generating equipment, namely the heat energy generated by the photo-thermal heat collection set is transmitted to the thermal power generation, and the power generating equipment is not required to be built by photo-thermal investment, so that the power generation and heat supply of the photo-thermal equipment are realized, the investment cost of the photo-thermal power generation is effectively reduced, the instability problem of new energy power generation is solved, and the photo-thermal heat supply can also be realized by utilizing the thermal power supply; the thermal power generating unit and the photo-thermal heat collection unit can generate electricity and supply heat complementarily, and meanwhile peak regulation and thermoelectric decoupling of the thermal power generating unit can be achieved to a certain degree.
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 reheat thermal power generating unit and light and heat cogeneration and steam supply system with peak regulation energy storage function which characterized in that: it comprises the following steps:
a temperature and pressure reducing steam supply device;
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 and a steam turbine intermediate-pressure cylinder which are both connected with the boiler, and the steam turbine high-pressure cylinder is connected with the temperature and pressure reducing steam supply device through a first control valve and a second control valve; when the thermal power generating unit normally operates, steam generated by the boiler enters a high-pressure cylinder of a steam turbine to do work, wherein one path of the steam returns to the boiler to reheat and absorb heat, the reheated steam after absorbing heat enters 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, and the other path of the steam enters a temperature-reducing and pressure-reducing steam supply device to supply heat to the outside, so that power generation and heat supply of a conventional thermal power plant are realized; the heater unit includes a feed pump;
the photo-thermal heat collection group comprises a photo-thermal heat collector and a steam generator; an inlet of the steam generator is connected with the feed water pump through a third control valve, an outlet of the steam generator is connected with a steam outlet of a high-pressure cylinder of the steam turbine through a fourth control valve and a first control valve, an outlet of the steam generator is connected with the temperature and pressure reducing steam supply device through a fourth control valve and a second control valve, an outlet of the top of the steam generator is connected with an inlet of a medium-pressure cylinder of the steam turbine through a fifth control valve, an outlet of the lower part of the steam generator is connected with the condensation unit through a sixth control valve, and the thermal power unit realizes peak load regulation of the thermal power unit through the control of the fifth control valve and the sixth control valve; the solar heat collector is internally provided with a heat storage working medium, the solar heat collection set is used for conveying the heat storage working medium from the solar heat collector to the steam generator, and then conveying the heat storage working medium from the steam generator to the solar heat collector to realize the storage and conveying circulation of hot and cold working mediums or cold and hot working mediums of the heat storage working medium and realize the energy transfer and storage of the thermal power generating unit to the solar heat collection set;
the photo-thermal collector conveys heat storage working medium to the steam generator, the steam generator heats the feed water conveyed by the feed water pump to the steam pressure and the temperature which are the same as the steam at the steam outlet of the high-pressure cylinder of the steam turbine or the steam inlet of the medium-pressure cylinder of the steam turbine through the thermal working medium, the power generation, heat supply and steam supply of the photo-thermal collector group are realized, and the simultaneous heat supply or independent heat supply of the thermal power generating unit and the photo-thermal collector group is realized through the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve.
2. The reheating thermal power generating unit with peak shaving energy storage function and photo-thermal combined power generation and steam supply system as claimed in claim 1,
the steam turbine still includes the steam turbine low pressure jar, the superheated steam of boiler export with steam turbine high pressure jar entry linkage, the reheater entry of boiler with steam turbine high pressure jar steam exhaust mouth is connected, the boiler reheater export with steam turbine intermediate pressure jar is connected, steam turbine intermediate pressure jar export with steam turbine low pressure jar entry linkage, steam turbine low pressure jar with the unit connection that condenses.
3. The reheating thermal power generating unit with peak shaving energy storage function and photo-thermal combined power generation and steam supply system as claimed in claim 2,
the condensing unit comprises a condenser and a condensate pump which are connected with the low-pressure cylinder of the steam turbine, the inlet of the condensate pump is connected with the condenser, and the outlet of the condensate pump is connected with the outlet of the lower part of the steam generator through a sixth control valve;
the heater unit also comprises a low-pressure heater connected with 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.
4. The reheating thermal power generating unit with peak shaving energy storage function and photo-thermal combined power generation and steam supply system as claimed in claim 1,
the steam generator includes a heat exchanger;
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 respectively, at least one seventh control valve connected with the heat exchanger, at least one cold working medium storage station connected with the at least one seventh control valve, at least one working medium conveying pump connected with the at least one cold working medium storage station, and at least one eighth control valve connected with the at least one working medium conveying pump and the photo-thermal heat collector respectively.
5. The reheat thermal power generating unit with peak shaver energy storage function and photo-thermal combined power generation and steam supply system as claimed in claim 4,
the photo-thermal heat collection unit further comprises at least one ninth control valve and at least one tenth control valve, wherein the ninth control valve is connected with the photo-thermal heat collector and the at least one cold working medium storage station respectively, and the tenth control valve is connected with the heat exchanger and the at least one working medium delivery pump respectively.
6. The reheat thermal power generating unit and photo-thermal combined power generation and steam supply system with peak regulation and energy storage functions as claimed in claim 1,
the photo-thermal collector adopts a groove type photo-thermal collector; alternatively, the first and second electrodes may be,
the photo-thermal collector adopts a tower-type photo-thermal collector.
7. The reheating thermal power generating unit with peak shaving energy storage function and photo-thermal combined power generation and steam supply system as claimed in claim 1,
the heat storage working medium is heat storage oil; alternatively, the first and second electrodes may be,
the heat storage working medium is molten salt.
8. The peak-shaving energy-storage-function reheating thermal power generating unit and photo-thermal combined power generation and steam supply system as claimed in claim 7,
the hot working medium temperature of the heat storage working medium is more than 350 ℃.
9. The peak-shaving energy-storage-function reheating thermal power generating unit and photo-thermal combined power generation and steam supply system as claimed in claim 1,
the first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve and the sixth control valve are all regulating valves.
10. The reheat thermal power unit and photo-thermal combined power and steam supply system as claimed in claim 5,
the seventh control valve, the eighth control valve, the ninth control valve and the tenth control valve are all regulating valves.
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| WO2024037027A1 (en) * | 2022-08-17 | 2024-02-22 | 西安热工研究院有限公司 | Solar-coal hybrid steam turbine system based on cascade utilization of energy, and power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024037027A1 (en) * | 2022-08-17 | 2024-02-22 | 西安热工研究院有限公司 | Solar-coal hybrid steam turbine system based on cascade utilization of energy, and power generation system |
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