CN116147212A - Cogeneration system based on heat storage and release of solid particles and control method - Google Patents

Cogeneration system based on heat storage and release of solid particles and control method Download PDF

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Publication number
CN116147212A
CN116147212A CN202211499022.8A CN202211499022A CN116147212A CN 116147212 A CN116147212 A CN 116147212A CN 202211499022 A CN202211499022 A CN 202211499022A CN 116147212 A CN116147212 A CN 116147212A
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heat
solid
gas
heat exchanger
solid particles
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曾光
高鸣
纪阳
李百航
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Institute of Engineering Thermophysics of CAS
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Institute of Engineering Thermophysics of CAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00—Arrangements for storing heat collected by solar heat collectors
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention relates to a cogeneration system and a control method, wherein the cogeneration system comprises: steam generator set and solar energy heat collecting unit; the first gas-solid heat exchanger is suitable for heating first solid particles passing through the first gas-solid heat exchanger by using heat of a heat transfer working medium led out from the solar heat collection unit, the first solid particles are heated to be second solid particles, and the heat transfer working medium after releasing the heat returns to the solar heat collection unit; a first storage device adapted to store the second solid particles; the second solid particles are suitable for heat exchange with fluid flowing through the second solid gas heat exchanger in the second solid gas heat exchanger to cool the fluid into first solid particles, and the fluid enters the steam generator set after being heated; and the particle conveying device is used for returning the first solid particles from the second gas-solid heat exchanger to the first gas-solid heat exchanger.

Description

Cogeneration system based on heat storage and release of solid particles and control method
Technical Field
The embodiment of the invention relates to the technical field of solar photo-thermal power generation, in particular to a cogeneration system based on solid particle heat storage and release and a control method of the cogeneration system based on solid particle heat storage and release.
Background
Solar energy in the solar photo-thermal power station is firstly converted into heat energy and then into electric energy, and the addition of the heat storage system can eliminate the influence of the clearance of the solar energy and weather factors, so that the continuous operation of the photo-thermal power station is ensured. The characteristics of the heat storage medium are important factors affecting the performance of the heat storage system, and heat storage media currently receiving attention from many researchers include air, water/steam, heat transfer oil, organic matters, molten salt, liquid metal, solid particles and the like. The heat conductivity coefficient of the air heat storage is poor and the efficiency is low; the heat transfer performance of water/steam heat storage is poor; the long-time heat storage cost of the heat conduction oil and the organic matters is high; the high-temperature heat storage of molten salt and liquid metal has strong corrosiveness; the heat storage technology is not the best choice for efficient and flexible co-production of electric heat of the solar photo-thermal power station under the construction goal of the novel power system. The solid particles have wide sources, low cost, good thermal stability and material compatibility, high upper limit of working temperature, excellent pneumatic conveying and heat transfer performance, simple and easily controlled system and contribution to full utilization of stored heat. The solid particle heat storage and release technology for the solar photo-thermal power station enters a rapid development stage.
However, the current heat storage technology has the problems of short energy storage time, high cost, low energy efficiency, strong corrosiveness and the like; the technology of flexible, efficient and economical cogeneration of solar photo-thermal power stations based on solid particle heat storage is also needed to be broken through.
Disclosure of Invention
In order to solve at least one aspect or point of the technical problems in the prior art, such as low energy efficiency, high cost, high temperature and easy corrosion in the current heat storage technology, for example, the invention provides a flexible, efficient and economic cogeneration technology for breaking through a solar photo-thermal power station based on solid particle heat storage.
According to an aspect of an embodiment of the present invention, there is provided a cogeneration system including:
a steam generator set and a solar heat collection unit;
the first gas-solid heat exchanger is suitable for heating first solid particles passing through the first gas-solid heat exchanger by using heat of a heat transfer working medium led out from the solar heat collection unit, the first solid particles are heated to be second solid particles, and the heat transfer working medium after releasing the heat returns to the solar heat collection unit;
a first storage device adapted to store the second solid particles;
the second solid particles from the first storage device are suitable for exchanging heat with fluid flowing through the second solid gas heat exchanger in the second solid gas heat exchanger to be cooled into first solid particles, and at least part of the fluid flowing through the second solid gas heat exchanger enters the steam generator set after being heated;
and the particle conveying device is used for returning the first solid particles from the second gas-solid heat exchanger to the first gas-solid heat exchanger.
According to another aspect of the embodiment of the present invention, there is provided a control method of cogeneration, including the steps of:
heating first solid particles passing through the first gas-solid heat exchanger by using heat which is led out from the solar heat collection unit and serves as a heat transfer working medium of the first fluid in the first gas-solid heat exchanger, wherein the first solid particles are heated to be second solid particles, and the first fluid after heat release returns to the solar heat collection unit;
storing the warmed second solid particles in a first storage device;
introducing the stored second solid particles into a second gas-solid heat exchanger to heat a second fluid flowing through the second gas-solid heat exchanger, wherein the second solid particles become first solid particles after heat exchange, and the second fluid becomes a third fluid after heat exchange and temperature rise;
introducing a third fluid into the steam generator set;
the first solid particles flowing out of the second gas-solid heat exchanger are returned to the first gas-solid heat exchanger.
Drawings
Fig. 1 is a schematic diagram of a cogeneration system based on solid particulate heat storage according to an exemplary embodiment of the invention.
Reference numerals:
101. a solar heat collecting unit; 102. a heat transfer medium; 103. an air heater or a first heat exchanger; 104. high temperature air; 105. a low temperature particle storage tank; 106. a high temperature gas-solid mixed heat exchanger; 107. a high temperature particle storage tank; 108. high temperature particles; 109. medium temperature air; 110. a medium temperature heat exchanger; 111. air after heat exchange; 112. hot water; 113. a particle transport device; 114. low temperature particles; 115. a gas-solid mixing multistage heat exchanger; 116. hot air; 117. steam; 118. normal temperature air; 119. normal temperature water; 120. electric power; 200. a steam generator set; 300. heat supply network or unit
Detailed Description
The following description of embodiments of the present invention with reference to fig. 1 is intended to illustrate the general inventive concept and should not be taken as limiting the invention.
The invention aims at solving at least one aspect of the defects in the prior art, and provides a heat and power cogeneration system based on solid particle heat storage and release, and a heat and power cogeneration system and a heat and power cogeneration method of a solar photo-thermal Rankine cycle power station based on solid particle heat storage and release.
As shown in fig. 1, a cogeneration system based on solid particle heat storage and release is provided, which comprises a steam generator set 200, a solar heat collection unit 101, a heat transfer working medium 102, an air heater 103, a low-temperature particle storage tank 105, a high-temperature gas-solid mixed heat exchanger 106, a high-temperature particle storage tank 107, a medium-temperature heat exchanger 110, a multi-stage gas-solid mixed heat exchanger 115, a particle conveying device 113 and a connecting assembly.
In the present invention, the heat storage medium is solid particles. The heat storage particles are solid particles with stable performance, such as quartz sand, alumina particles, ferric oxide particles, inert ash and the like, and compared with the solid particles which adopt liquid working media, gas working media or other working media (such as molten salt) easy to change phase for heat storage, the solid particles with stable performance have the advantages of wide working temperature range, stable performance at high temperature, easy realization of graded coupling absorption and subsequent release of various energies, and low use cost, and heat absorption of the solid particles can improve the heat utilization rate due to the fact that the solid particles can work at a higher temperature (the temperature reaches over 900 ℃).
In the present invention, the high temperature solid particles may have a temperature of, for example, 500 to 800 ℃.
The gas-solid heat exchanger is a gas-solid mixing structure which can be a fluidized bed, a bubbling bed, a moving bed, an entrained flow bed and the like.
The particle transport device 113 may be in the form of a gas-solid transport pump, or other suitable device for transporting solid particles.
As can be appreciated, in the present invention, the high temperature particle tank 107 is a thermal insulation tank, so that even if the solid particles pass a longer time, for example, 12 hours, they can be maintained at a higher temperature.
After the solid particles exchange heat in the gas-solid heat exchanger, the gas and the solid particles can be separated by a special gas-solid separator, and the gas can flow upwards and the solid particles can flow downwards by bubbling fluidization, so that the heat exchange and the separation are completed in mixed flows, and the description is omitted here.
The heat transfer working medium in the invention, namely the heat transfer working medium generated in the solar heat collection unit 101, can be heat transfer oil or molten salt, and the heat transfer working medium returns to the solar heat collection unit 101 after releasing heat, so that the heat is stored in a mode of reducing the load of the steam generator set 200.
In the invention, as shown in fig. 1, a steam generator set 200, a solar heat collecting unit 101, a heat transfer working medium 102, an air heater 103, a high-temperature gas-solid mixed heat exchanger 106 and a high-temperature particle storage tank 107 form a high-temperature solid particle heat storage unit, and the high-temperature particle storage tank 107, the gas-solid mixed multi-stage heat exchanger 115 and the steam generator set 200 form a gas-solid mixed multi-stage heat release unit.
On the basis of continuous and stable operation, the solar photo-thermal Rankine cycle power station based on heat storage and release of solid particles not only realizes the heat supply capacity of the solar photo-thermal Rankine cycle power station, but also effectively improves the peak regulation capacity of a power grid.
And (3) heat storage process: when the power demand of the power grid is low, surplus high-temperature heat transfer working medium generated by the solar heat collection unit 101 enters the air heater 103 to generate high-temperature air. Solid particles enter a high-temperature gas-solid flow heat exchanger 106 from a cold particle storage tank 105 and are in direct contact with high-temperature air, gas-solid two phases are mixed to finish heat transfer, and particles (400-600 ℃) are stored in a high-temperature particle storage tank 107 after temperature rise; through parameter regulation and control, the temperature (about 200 ℃) of air at the outlet of the high-temperature gas-solid mixed heat exchanger 106 is used as a heat source of a subsequent medium-temperature heat exchanger 110 to produce hot water (55-65 ℃) which is used for a heat supply network or a steam generator set, and air (65-75 ℃) after heat exchange is supplemented into the air heater 103.
Exothermic process: the high-temperature particles 108 sequentially pass through the multistage gas-solid mixing heat exchanger 115, gradually heat the water, and return to the low-temperature particle storage tank 105 through the particle conveying device 113 to finish heat release. In addition, the normal temperature air of the gas-solid mixing multistage heat exchanger 115 is warmed up by the serial utilization, so that the hot air at the outlet enters the high temperature heat storage unit, and waste heat utilization is realized.
Electric heating double supply: the superheated steam is generated after the high-temperature water is heated step by high-temperature particles, and the superheated steam parameters (400-550 ℃) at the outlet of the superheater are controlled by adjusting the particle flow, the heat exchange working medium flow and the heat exchange area according to actual requirements and are used as working media of a steam generator set; and hot water (80-90 ℃) with a certain proportion can be extracted from the intermediate stage according to the requirement and used for enhancing the heat supply of the solar photo-thermal Rankine cycle power station.
According to the invention, the solid particle heat storage unit, the multistage heat release unit and the deep coupling of waste heat utilization and the solar photo-thermal Rankine cycle power station are realized by utilizing the solid particles to store the surplus heat during the deep peak regulation of the steam generator set, and the method has three flexible operation regulation and control methods of heat storage, heat storage and release parallelism and heat release, so that the heat supply capacity of the solar photo-thermal power station is realized, the power grid peak regulation capacity is enhanced, and the flexible, efficient and economic dual supply of the electric power and the heat of the solar photo-thermal Rankine cycle power station is realized; through the waste heat utilization and flexible operation regulation in the heat storage and release process, high-temperature long-time heat storage is realized, the energy efficiency is improved, and the operation cost is reduced; through solid particle heat storage and multistage heat release, the deep peak regulation capacity and flexible heat supply capacity of the steam generator set are enhanced, and efficient economic thermal electrolytic coupling is realized; through waste heat utilization and flexible operation regulation in heat storage and release process, the height is improvedOf thermal storage and release systems
Figure SMS_1
Utilization efficiency and operational flexibility.
Fig. 1 is an exemplary embodiment of the invention, and other variations of the invention are possible.
For example, the low-temperature particle storage tank 105 may not be provided, that is, the high-temperature particles are directly returned to the gas-solid mixing heat exchanger 106 after heat release, and a cycle of absorbing and releasing heat of the solid particles may be formed, or the solid particles may be collected in the high-temperature particle storage tank 107 after they are all placed in the gas-solid mixing heat exchanger 106 to absorb heat, so as to start the heat release cycle when heat of the high-temperature particles needs to be released.
For example, the air heater 103 may not be provided, that is, the heat exchange medium 102 of the solar heat collection unit 101 may directly go to the gas-solid mixed heat exchanger 106 to release heat to the low-temperature particles and then return to the solar heat collection unit 101. In this case, the medium temperature heat exchanger 110 may not be provided.
In the cogeneration system of the invention, the intermediate temperature heat exchanger 110 may not be provided, so that the intermediate temperature air 109 in fig. 1 can directly enter the air heater 103.
In the cogeneration system of the present invention, the heat supply network 300 may not be provided, and thus, the hot water 112 from the intermediate-temperature heat exchanger 110 or the hot water 112 from the gas-solid hybrid multi-stage heat exchanger 115 may be introduced into the steam generator set 200.
In the cogeneration system of the invention, optionally, in the heat release process, the fluidization air of the gas-solid mixing multistage heat exchanger 115 can be changed from normal-temperature air 118 to heat exchanged air 111, so that the direct and efficient utilization of the waste heat of the heat exchanged air is realized.
In the cogeneration system of the invention, optionally, the medium temperature heat exchanger 110 and the air heater 103 may not be provided, and the heat supply network 300 is provided with hot water or steam only by the gas-solid hybrid multistage heat exchanger 115.
Based on the above, the invention provides the following technical scheme:
1. a cogeneration system comprising:
a steam generator set and a solar heat collection unit;
the first gas-solid heat exchanger is suitable for heating first solid particles passing through the first gas-solid heat exchanger by using heat of a heat transfer working medium led out from the solar heat collection unit, the first solid particles are heated to be second solid particles, and the heat transfer working medium after releasing the heat returns to the solar heat collection unit;
a first storage device adapted to store the second solid particles;
the second solid particles from the first storage device are suitable for exchanging heat with fluid flowing through the second solid gas heat exchanger in the second solid gas heat exchanger to be cooled into first solid particles, and at least part of the fluid flowing through the second solid gas heat exchanger enters the steam generator set after being heated;
and the particle conveying device is used for returning the first solid particles from the second gas-solid heat exchanger to the first gas-solid heat exchanger.
2. The cogeneration system of claim 1, further comprising:
and the particle conveying device is used for conveying the first solid particles from the second gas-solid heat exchanger into the second storage device for storage, and the second storage device is communicated with the first gas-solid heat exchanger to provide the first solid particles.
3. The cogeneration system of claim 1, further comprising:
the heat transfer working medium generated by the solar heat collection unit is suitable for flowing through the first heat exchange device to heat the first air flowing through the first heat exchange device and then returns to the solar heat collection unit, the first air flows through the first heat exchanger and is heated to be second air,
wherein:
the first solid particles are suitable for absorbing heat of the second air from the first heat exchange device in the first gas-solid heat exchanger, the second air is suitable for being cooled by the first solid particles and then cooled to be third air, and the first solid particles are heated and then are second solid particles.
4. A cogeneration system according to claim 3, wherein:
the third air is adapted to be directly introduced into the first heat exchange device; or alternatively
The cogeneration system further comprises a second heat exchange device, wherein third air is suitable for flowing through the second heat exchange device to exchange heat with first water flowing through the second heat exchange device, the third air is suitable for being cooled to fourth air, the first water is suitable for being heated to second water after flowing through the second heat exchange device, and the fourth air is suitable for being introduced into the first heat exchange device or the second gas-solid heat exchanger.
5. The cogeneration system of claim 4, further comprising:
a heating unit for heating, wherein: the second water from the second heat exchange device is suitable for being supplied to a heat supply unit and/or a steam generator set, the fluid flowing through the second gas-solid heat exchanger comprises the first water and the hot water and/or steam formed after heating is suitable for being communicated with the heat supply unit.
6. The cogeneration system of claim 5 wherein:
the fluid flowing through the second gas-solid heat exchanger comprises first air which is heated by the second gas-solid heat exchanger to be heated into fifth air, and the fifth air is suitable for being introduced into the first heat exchange device;
the fluid flowing through the second gas-solid heat exchanger comprises first water, and is heated by the second gas-solid heat exchanger to be heated into superheated steam, wherein the superheated steam is suitable for being introduced into a steam generator set to serve as a power generation working medium.
7. The cogeneration system of claim 1, further comprising:
a heating unit for heating, wherein: the fluid flowing through the second gas-solid heat exchanger comprises the first water and is suitable for being communicated with the heat supply unit after being heated by the second gas-solid heat exchanger.
8. A control method of a cogeneration system, comprising the steps of:
heating first solid particles passing through the first gas-solid heat exchanger by using heat which is led out from the solar heat collection unit and serves as a heat transfer working medium of the first fluid in the first gas-solid heat exchanger, wherein the first solid particles are heated to be second solid particles, and the first fluid after heat release returns to the solar heat collection unit;
storing the warmed second solid particles in a first storage device;
introducing the stored second solid particles into a second gas-solid heat exchanger to heat a second fluid flowing through the second gas-solid heat exchanger, wherein the second solid particles become first solid particles after heat exchange, and the second fluid becomes a third fluid after heat exchange and temperature rise;
introducing a third fluid into the steam generator set;
the first solid particles flowing out of the second gas-solid heat exchanger are returned to the first gas-solid heat exchanger.
9. The method according to claim 8, wherein:
the first fluid led out from the solar heat collection unit directly passes through the first gas-solid heat exchanger, the first solid particles passing through the first gas-solid heat exchanger are heated in the first gas-solid heat exchanger by the heat of the first fluid led out from the solar heat collection unit, and the first fluid cooled after heat exchange with the first solid particles returns to the solar heat collection unit.
10. The method according to claim 8, wherein:
the first fluid led out from the solar heat collection unit is led into the first heat exchange device to heat the first air flowing through the first heat exchange device and then returns to the solar heat collection unit, and the first air flows through the first heat exchange device and is heated to be second air;
the first solid particles are suitable for absorbing heat of the second air from the first heat exchange device in the first gas-solid heat exchanger, the second air is suitable for being cooled by the first solid particles and then cooled to be third air, and the first solid particles are heated and then are second solid particles.
11. The method of claim 10, further comprising the step of:
the third air flows through the second heat exchange device to exchange heat with the first water flowing through the second heat exchange device, the third air is suitable for being cooled to fourth air, the first water is suitable for being heated to second water, and the fourth air is suitable for being introduced into the first heat exchange device or the second gas-solid heat exchanger.
12. The method according to 8 or 11, further comprising the step of:
the second water is supplied to the heating unit.
13. The method according to claim 8, wherein:
the third fluid comprises superheated steam.
14. The method according to claim 8, wherein:
the step of returning the first solid particles flowing out of the second gas-solid heat exchanger to the first gas-solid heat exchanger includes: the first solid particles flowing out of the second gas-solid heat exchanger are transported into the second storage device by the particle transport device, and the first solid particles stored therein are supplied from the second storage device to the first gas-solid heat exchanger.
15. The method of any one of claims 8-14, further comprising the step of:
heating the first solid particles passing through the first gas-solid heat exchanger with heat extracted from the solar heat collection unit and storing the second solid particles in the event that load demand of the steam generator set decreases;
in the event of an increased load demand of the steam generator set, heat is released from the second solid particles to heat the power generating working fluid or fluid entering the steam generator set.
16. The method of claim 12, further comprising the step of:
controlling parameters of steam serving as a power generation working medium of the steam generator set from the second gas-solid heat exchanger by adjusting the particle flow, the heat exchange working medium flow and the heat exchange area; and
and extracting a certain proportion of second water from the intermediate stage of the second gas-solid heat exchanger to the heat supply unit according to the requirement so as to enhance the heat supply capacity of the steam generator set.
In the present invention, low temperature particles means particles having a temperature below 100 ℃. As a heat exchange working medium, the temperature of the high-temperature heat exchange working medium is higher than 600 ℃.
In the present invention, the term "medium temperature" means a temperature in the range of 150 to 250 ℃. The normal temperature means a temperature in the range of 20 to 50 ℃. Hot water means water having a temperature in the range of 50 to 95 ℃. Hot air or hot air means that the temperature of the air or hot air is in the range of 250 to 350 ℃.
In the present invention, unless explicitly indicated otherwise, the numerical ranges include the end points, the middle points of the ranges, and the like.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes may be made and equivalents may be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (16)

1. A cogeneration system comprising:
a steam generator set and a solar heat collection unit;
the first gas-solid heat exchanger is suitable for heating first solid particles passing through the first gas-solid heat exchanger by using heat of a heat transfer working medium led out from the solar heat collection unit, the first solid particles are heated to be second solid particles, and the heat transfer working medium after releasing the heat returns to the solar heat collection unit;
a first storage device adapted to store the second solid particles;
the second solid particles from the first storage device are suitable for exchanging heat with fluid flowing through the second solid gas heat exchanger in the second solid gas heat exchanger to be cooled into first solid particles, and at least part of the fluid flowing through the second solid gas heat exchanger enters the steam generator set after being heated;
and the particle conveying device is used for returning the first solid particles from the second gas-solid heat exchanger to the first gas-solid heat exchanger.
2. The cogeneration system of claim 1, further comprising:
and the particle conveying device is used for conveying the first solid particles from the second gas-solid heat exchanger into the second storage device for storage, and the second storage device is communicated with the first gas-solid heat exchanger to provide the first solid particles.
3. The cogeneration system of claim 1, further comprising:
the heat transfer working medium generated by the solar heat collection unit is suitable for flowing through the first heat exchange device to heat the first air flowing through the first heat exchange device and then returns to the solar heat collection unit, the first air flows through the first heat exchanger and is heated to be second air,
wherein:
the first solid particles are suitable for absorbing heat of the second air from the first heat exchange device in the first gas-solid heat exchanger, the second air is suitable for being cooled by the first solid particles and then cooled to be third air, and the first solid particles are heated and then are second solid particles.
4. A cogeneration system according to claim 3, wherein:
the third air is adapted to be directly introduced into the first heat exchange device; or alternatively
The cogeneration system further comprises a second heat exchange device, wherein third air is suitable for flowing through the second heat exchange device to exchange heat with first water flowing through the second heat exchange device, the third air is suitable for being cooled to fourth air, the first water is suitable for being heated to second water after flowing through the second heat exchange device, and the fourth air is suitable for being introduced into the first heat exchange device or the second gas-solid heat exchanger.
5. The cogeneration system of claim 4, further comprising:
a heating unit for heating, wherein: the second water from the second heat exchange device is suitable for being supplied to a heat supply unit and/or a steam generator set, the fluid flowing through the second gas-solid heat exchanger comprises the first water and the hot water and/or steam formed after heating is suitable for being communicated with the heat supply unit.
6. The cogeneration system of claim 5 wherein:
the fluid flowing through the second gas-solid heat exchanger comprises first air which is heated by the second gas-solid heat exchanger to be heated into fifth air, and the fifth air is suitable for being introduced into the first heat exchange device;
the fluid flowing through the second gas-solid heat exchanger comprises first water, and is heated by the second gas-solid heat exchanger to be heated into superheated steam, wherein the superheated steam is suitable for being introduced into a steam generator set to serve as a power generation working medium.
7. The cogeneration system of claim 1, further comprising:
a heating unit for heating, wherein: the fluid flowing through the second gas-solid heat exchanger comprises the first water, and hot water and/or steam formed after being heated by the second gas-solid heat exchanger is/are suitable for being communicated with the heat supply unit.
8. A control method of cogeneration, comprising the steps of:
heating first solid particles passing through the first gas-solid heat exchanger by using heat which is led out from the solar heat collection unit and serves as a heat transfer working medium of the first fluid in the first gas-solid heat exchanger, wherein the first solid particles are heated to be second solid particles, and the first fluid after heat release returns to the solar heat collection unit;
storing the warmed second solid particles in a first storage device;
introducing the stored second solid particles into a second gas-solid heat exchanger to heat a second fluid flowing through the second gas-solid heat exchanger, wherein the second solid particles become first solid particles after heat exchange, and the second fluid becomes a third fluid after heat exchange and temperature rise;
introducing a third fluid into the steam generator set;
the first solid particles flowing out of the second gas-solid heat exchanger are returned to the first gas-solid heat exchanger.
9. The method according to claim 8, wherein:
the first fluid led out from the solar heat collection unit directly passes through the first gas-solid heat exchanger, the first solid particles passing through the first gas-solid heat exchanger are heated in the first gas-solid heat exchanger by the heat of the first fluid led out from the solar heat collection unit, and the first fluid cooled after heat exchange with the first solid particles returns to the solar heat collection unit.
10. The method according to claim 8, wherein:
the first fluid led out from the solar heat collection unit is led into the first heat exchange device to heat the first air flowing through the first heat exchange device and then returns to the solar heat collection unit, and the first air flows through the first heat exchange device and is heated to be second air;
the first solid particles are suitable for absorbing heat of the second air from the first heat exchange device in the first gas-solid heat exchanger, the second air is suitable for being cooled by the first solid particles and then cooled to be third air, and the first solid particles are heated and then are second solid particles.
11. The method of claim 10, further comprising the step of:
the third air flows through the second heat exchange device to exchange heat with the first water flowing through the second heat exchange device, the third air is suitable for being cooled to fourth air, the first water is suitable for being heated to second water, and the fourth air is suitable for being introduced into the first heat exchange device or the second gas-solid heat exchanger.
12. The method according to claim 8 or 11, further comprising the step of:
the second water is supplied to the heating unit.
13. The method according to claim 8, wherein:
the third fluid comprises superheated steam.
14. The method according to claim 8, wherein:
the step of returning the first solid particles flowing out of the second gas-solid heat exchanger to the first gas-solid heat exchanger includes: the first solid particles flowing out of the second gas-solid heat exchanger are transported into the second storage device by the particle transport device, and the first solid particles stored therein are supplied from the second storage device to the first gas-solid heat exchanger.
15. The method according to any one of claims 8-14, further comprising the step of:
in the event that the load demand of the steam generator set is reduced, extracting heat from the first fluid from the solar heat collection unit to heat the first solid particles passing through the first gas-solid heat exchanger, and storing the second solid particles;
in the event of an increased load demand of the steam generator set, heat is released from the second solid particles to heat the power generating working fluid or fluid entering the steam generator set.
16. The method of claim 12, further comprising the step of:
controlling parameters of steam serving as a power generation working medium of the steam generator set from the second gas-solid heat exchanger by adjusting the particle flow, the heat exchange working medium flow and the heat exchange area; and
and extracting a certain proportion of second water from the intermediate stage of the second gas-solid heat exchanger to the heat supply unit according to the requirement so as to enhance the heat supply capacity of the steam generator set.
CN202211499022.8A 2022-11-28 2022-11-28 Cogeneration system based on heat storage and release of solid particles and control method Pending CN116147212A (en)

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