CN115596629A - Trough type DSG solar heat collection auxiliary power generation device for power plant - Google Patents
Trough type DSG solar heat collection auxiliary power generation device for power plant Download PDFInfo
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- CN115596629A CN115596629A CN202211161526.9A CN202211161526A CN115596629A CN 115596629 A CN115596629 A CN 115596629A CN 202211161526 A CN202211161526 A CN 202211161526A CN 115596629 A CN115596629 A CN 115596629A
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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
- F03G6/061—Parabolic linear or through concentrators
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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
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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
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/71—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with parabolic reflective surfaces
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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
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Sustainable Energy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to the technical field of solar energy photo-thermal utilization, and discloses a trough type DSG solar energy heat collection auxiliary power generation device for a power plant, which comprises: the system comprises a light-gathering and heat-collecting subsystem, a heat exchange subsystem, a heat storage subsystem and an auxiliary power generation subsystem, wherein the light-gathering and heat-collecting subsystem is used for tracking and reflecting sunlight, the heat exchange subsystem is connected with the light-gathering and heat-collecting subsystem and is used for controlling a steam turbine to generate power, the heat storage subsystem is used for storing energy and driving the stored energy to generate power by the steam turbine, and the auxiliary power generation subsystem is used for assisting the steam turbine to generate power.
Description
Technical Field
The invention relates to the technical field of solar photo-thermal utilization, in particular to a groove type DSG solar heat collection auxiliary power generation device for a power plant.
Background
Solar energy is taken as a renewable energy source, and the development and utilization of a photo-thermal technology are one of effective ways for realizing green sustainable development and are also important means for realizing 'carbon reduction'. The groove type solar DSG (DSG is an abbreviation of english Direct Steam Generation, meaning Direct Steam power Generation) photo-thermal power Generation technology is a technology that low-density solar energy received from the earth surface is collected by using a light-gathering technology and converted into heat energy of a working medium, and then the heat energy is converted into electric energy through heat circulation, so that the groove type solar DSG photo-thermal power Generation technology is an economic and effective way for realizing the utilization of high-temperature heat in solar energy, and has important significance for solving the problems of fossil resource shortage, environmental pollution, greenhouse effect and the like. The groove type solar DSG photo-thermal power generation technology has the advantages that the system is compact in structure, easy to achieve standardization, suitable for mass production, simple to machine, low in manufacturing and installation cost, large or small in system capacity, convenient to install and maintain, low in tracking control cost and wide in development prospect, and the groove type parabolic condenser for focusing sunlight is used for focusing sunlight.
The groove type DSG system is based on a groove type solar heat collecting pipe, working medium water in the heat collecting pipe is directly heated step by step and is pressurized and circulated by a circulating water pump to generate superheated steam of about 400 ℃ (9 MPa), the traditional groove type DSG system adopts water as a heat transfer working medium, the water is heated in an absorption pipe of the heat collector and is subjected to phase change heat transfer, and due to the action of gravity, gas and liquid are unevenly distributed in the pipe, if the flow rate is improperly controlled, the layering phenomenon is easy to occur.
Therefore, how to provide a trough-type DSG solar heat collection auxiliary power generation device capable of eliminating the two-phase flow layering phenomenon is a technical problem to be solved at present.
Disclosure of Invention
The invention aims to provide a trough type DSG solar heat collection auxiliary power generation device for a power plant, which utilizes a steam-water separator to separate steam from water, separated steam enters a superheater to be further heated to a required temperature, hydrophobic water with higher temperature is generated in the steam-water separator and is conveyed to a unit heat recovery system by a hydrophobic pump, so that the unidirectional flow of working media in a water heating section and a steam overheating section can be ensured, the flow pattern is simple in the state, the heat transfer flow of the working media in a pipe is stable, and the superheated steam parameters at the outlet of the system are easy to control, thereby eliminating the hidden trouble caused by the phenomenon of two-phase flow stratification.
In order to achieve the above object, the present invention provides a trough type DSG solar heat collection auxiliary power generation device for a power plant, the device comprising:
the light and heat collecting subsystem is used for tracking reflected sunlight;
the heat exchange subsystem is connected with the light and heat collecting subsystem and is used for controlling a steam turbine to generate electricity;
the heat storage subsystem is used for storing energy and using the stored energy to drive the steam turbine to generate electricity;
and the auxiliary power generation subsystem is used for assisting the steam turbine to generate power.
In one embodiment, the light and heat collecting subsystem comprises:
an aluminum parabolic reflector for reflecting sunlight incident rays into sunlight reflected rays;
the heat collecting pipe is used for absorbing solar radiation energy generated by the sunlight reflection rays and heating the supercooled water in the heat collecting pipe according to the solar radiation energy;
and the tracking device is used for tracking the incident rays of the sunlight.
In one embodiment, the heat exchange subsystem comprises:
the circulating water pump is used for conveying the supercooled water in the heat collecting pipe;
the inlet of the preheater is connected to the outlet of the circulating water pump through a pipeline, and the preheater is used for preheating the supercooled water;
the inlet of the steam generator is connected to the outlet of the preheater through a pipeline, and the steam generator is used for carrying out secondary heating treatment on the supercooled water after the preheating treatment and generating wet steam;
the water inlet pipe of the steam-water separator is connected to the outlet of the steam generator through a pipeline, and the steam-water separator is used for performing steam-water separation treatment on the wet steam to obtain steam and hydrophobic water;
and the inlet of the superheater is connected to a steam outlet pipe of the steam-water separator through a pipeline, and the superheater is used for heating the steam and controlling a steam turbine to generate power according to the steam after heating treatment.
In one embodiment, the heat exchange subsystem further comprises:
and one end of the recirculation adjusting valve is connected to the inlet of the preheater, the other end of the recirculation adjusting valve is connected to the outlet of the preheater, and the recirculation adjusting valve is used for controlling the preheating temperature of the supercooled water in the preheater.
In one embodiment, the heat exchange subsystem further comprises:
and the inlet of the drainage pump is connected to a drainage outlet pipe of the steam-water separator through a pipeline, and the drainage pump is used for conveying the drainage to a unit heat recovery system.
In one embodiment, the steam separator includes:
the steam trap comprises a shell, wherein a steam outlet pipe, a drainage outlet pipe and a water inlet pipe are arranged on the shell;
the surrounding plate separator is arranged in the shell, and the outer diameter size of the surrounding plate separator is the same as the inner diameter size of the shell;
the separator is arranged on the side wall of the enclosing plate, and is used for performing steam-water separation treatment;
a shutter disposed above the separator, the shutter for introducing the steam into the steam outlet pipe;
and the drying chamber is arranged between the inner wall of the shell and the shutter and is used for drying the steam.
In one embodiment, the steam-water separator further comprises:
a mist eliminator disposed on a sidewall of the separator, the mist eliminator configured to remove water droplets from the steam;
a water level gauge disposed within the housing, the water level gauge for indicating a level of water drained in the housing.
In one embodiment, the thermal storage subsystem comprises:
the cold molten salt tank is used for storing molten salt which is not subjected to high-temperature treatment;
the inlet of the low-temperature molten salt pump is connected to the outlet of the cold molten salt tank through a pipeline, and the low-temperature molten salt pump is used for conveying the molten salt which is not subjected to high-temperature treatment;
the inlet of the high-voltage electric heater is connected to the outlet of the low-temperature molten salt pump through a pipeline, and the high-voltage electric heater is used for carrying out high-temperature heating treatment on the molten salt which is not subjected to high-temperature treatment;
the inlet of the hot-melt salt tank is connected to the outlet of the high-voltage electric heater through a pipeline, and the hot-melt salt tank is used for storing molten salt subjected to high-temperature heating treatment;
the inlet of the high-temperature molten salt pump is connected to the outlet of the hot molten salt tank through a pipeline, and the high-temperature molten salt pump is used for conveying the molten salt subjected to high-temperature heating treatment;
and an inlet of the steam separator is connected to an outlet of the high-temperature molten salt pump through a pipeline, an outlet of the steam separator is connected to an inlet of the cold molten salt tank through a pipeline, and the steam separator is used for separating feed water in the steam separator into high-temperature steam according to the molten salt subjected to high-temperature heating treatment.
In one embodiment, the thermal storage subsystem further comprises:
and the adjusting valve is arranged between the high-temperature molten salt pump and the steam separator and is used for adjusting the conveying amount of the molten salt subjected to high-temperature heating treatment.
In one embodiment, the method further comprises the following steps:
a heat source switching control device for controlling switching between the heat storage subsystem and the auxiliary power generation subsystem.
The invention provides a trough type DSG solar heat collection auxiliary power generation device for a power plant, which has the following beneficial effects compared with the prior art:
the invention discloses a trough type DSG solar heat collection auxiliary power generation device for a power plant, which comprises: the system comprises a light-gathering and heat-collecting subsystem, a heat exchange subsystem, a heat storage subsystem and an auxiliary power generation subsystem, wherein the light-gathering and heat-collecting subsystem is used for tracking and reflecting sunlight, the heat exchange subsystem is connected with the light-gathering and heat-collecting subsystem and is used for controlling a steam turbine to generate power, the heat storage subsystem is used for storing energy and driving the stored energy to generate power by the steam turbine, and the auxiliary power generation subsystem is used for assisting the steam turbine to generate power.
Particularly, the invention utilizes the steam-water separator to separate steam from water, the separated steam enters the superheater and is further heated to the required temperature, hydrophobic water with higher temperature is generated in the steam-water separator and is conveyed to the unit heat recovery system by utilizing the hydrophobic pump, thus ensuring the unidirectional flow of working media of the water heating section and the steam superheat section, the flow pattern of the state is simple, the heat transfer flow of the working media in the pipe is stable, and the superheated steam parameters at the outlet of the system are easy to control, thereby eliminating the hidden trouble caused by the layering phenomenon of two-phase flow.
Drawings
FIG. 1 is a schematic structural diagram of a trough type DSG solar heat collection auxiliary power generation device for a power plant in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a light and heat collecting subsystem in an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a light-gathering and heat-collecting subsystem in an embodiment of the invention;
FIG. 4 shows a schematic structural diagram of a heat exchange subsystem in an embodiment of the invention;
FIG. 5 is a schematic diagram showing the structure of the steam-water separator in the embodiment of the invention;
fig. 6 shows a schematic structural diagram of a heat storage subsystem in an embodiment of the invention.
In the figure, 1, an aluminum parabolic reflector; 2. a heat collecting pipe; 3. a tracking axis; 4. a water circulating pump; 5. a preheater; 6. a steam generator; 7. a steam-water separator; 8. a superheater; 9. a recirculation adjustment valve; 10. a drain pump; 11. a housing; 12. a steam outlet pipe; 13. a hydrophobic outlet pipe; 14. a water inlet pipe; 15. enclosing plates; 16. a separator; 17. a blind window; 18. a drying chamber; 19. a mist eliminator; 20. a water level gauge; 21. a cold molten salt tank; 22. a low-temperature salt dissolving pump; 23. a high-voltage electric heater; 24. a hot-melt salt tank; 25. a high-temperature salt dissolving pump; 26. a steam separator; 27. and adjusting the valve.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
Throughout the description of the present application, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention discloses a trough-type DSG solar heat collection auxiliary power generation device for a power plant, including:
the light and heat collecting subsystem is used for tracking reflected sunlight;
the heat exchange subsystem is connected with the light and heat gathering subsystem and is used for controlling a steam turbine to generate electricity;
the heat storage subsystem is used for storing energy and using the stored energy to drive the steam turbine to generate electricity;
and the auxiliary power generation subsystem is used for assisting the steam turbine to generate power.
In this embodiment, the invention discloses a trough type DSG solar heat collection auxiliary power generation device for a power plant, including: the system comprises a light-gathering and heat-collecting subsystem, a heat exchange subsystem, a heat storage subsystem and an auxiliary power generation subsystem, wherein the light-gathering and heat-collecting subsystem is used for tracking and reflecting sunlight, the heat exchange subsystem is connected with the light-gathering and heat-collecting subsystem and is used for controlling a steam turbine to generate power, the heat storage subsystem is used for storing energy and driving the stored energy to generate power by the steam turbine, and the auxiliary power generation subsystem is used for assisting the steam turbine to generate power.
Particularly, the invention utilizes the steam-water separator to separate steam from water, the separated steam enters the superheater and is further heated to the required temperature, hydrophobic water with higher temperature is generated in the steam-water separator and is conveyed to the unit heat recovery system by utilizing the hydrophobic pump, thus ensuring the unidirectional flow of working media of the water heating section and the steam superheat section, the flow pattern of the state is simple, the heat transfer flow of the working media in the pipe is stable, and the superheated steam parameters at the outlet of the system are easy to control, thereby eliminating the hidden trouble caused by the layering phenomenon of two-phase flow.
As shown in fig. 2 and 3, in some embodiments of the present application, the light and heat collecting subsystem includes:
an aluminum parabolic reflector 1 for reflecting sunlight incident rays into sunlight reflected rays;
the heat collecting pipe 2 is used for absorbing solar radiation energy generated by the sunlight reflected light and heating the supercooled water in the heat collecting pipe 2 according to the solar radiation energy;
and the tracking device is used for tracking the incident rays of the sunlight.
In the embodiment, the light and heat collecting subsystem is composed of an aluminum parabolic reflector 1, a heat collecting tube 2 and a tracking device (not shown in the figure), the aluminum parabolic reflector 1 focuses and reflects sunlight on a line, the heat collecting tube 2 is arranged and installed on the focal line to absorb solar radiation energy after the focused and reflected sunlight, fluid in the heat collecting tube is heated through a heat carrier in the tube, the surface of the aluminum parabolic reflector 1 is made of aluminum alloy, meanwhile, mirror surface reflecting aluminum is used as a light collecting lens, the weight of a heat collector in a unit area is greatly reduced by the whole frame type structure, the light collecting lens is designed in a honeycomb type composite structure, namely, the high-efficiency reflectivity of the reflecting aluminum is utilized, the structural strength of the aluminum parabolic reflector 1 is guaranteed, and the heat collecting tube 2 collects heat by adopting a vacuum glass collecting tube and comprises a stainless steel inner tube, and a glass sleeve, a degassing ring and a corrugated tube which are wrapped outside. In order to obtain better optical performance, the surface of the metal tube is coated with a selective coating, and the coating has high absorptivity and low emissivity for solar spectrum, so that the radiation heat loss of the metal heat absorption tube to the outside is reduced. The glass sleeve is generally made of heat-resistant glass, and has excellent strength and light transmittance at high temperatures. Vacuum is pumped between the glass sleeve and the metal heat absorbing pipe to inhibit convection heat dissipation. The sealing joint of the glass sleeve and the metal tube is connected by using a corrugated tube, so that the thermal expansion of the metal heat absorption tube and the glass sleeve can be matched. The tracking mode of the tracking device in the application is one-dimensional tracking, including north-south tracking and east-west tracking, tracking of sunlight incident rays is realized through adjusting the tracking shaft 3 of the tracking device, so that the light-gathering and heat-collecting subsystem can utilize solar radiation energy to the maximum extent, and the heating efficiency of the heat collecting tube 2 is improved.
In some embodiments of the present application, as shown in fig. 4, the heat exchange subsystem comprises:
the circulating water pump 4 is used for conveying the supercooled water in the heat collecting pipe 2;
an inlet of the preheater 5 is connected to an outlet of the circulating water pump 4 through a pipeline, and the preheater 5 is used for preheating the supercooled water;
the inlet of the steam generator 6 is connected to the outlet of the preheater 5 through a pipeline, and the steam generator 6 is used for carrying out secondary heating treatment on the preheated supercooled water and generating wet steam;
a water inlet pipe of the steam-water separator 7 is connected to an outlet of the steam generator 6 through a pipeline, and the steam-water separator 7 is used for performing steam-water separation treatment on the wet steam to obtain steam and hydrophobic water;
the inlet of the superheater 8 is connected to the steam outlet pipe 12 of the steam-water separator 7 through a pipeline, and the superheater 8 is used for heating the steam and controlling a steam turbine to generate power according to the heated steam.
In some embodiments of the present application, the heat exchange subsystem further comprises:
and one end of the recirculation adjusting valve 9 is connected to the inlet of the preheater 5, the other end of the recirculation adjusting valve 9 is connected to the outlet of the preheater 5, and the recirculation adjusting valve 9 is used for controlling the preheating temperature of the supercooled water in the preheater 5.
In some embodiments of the present application, the heat exchange subsystem further comprises:
the inlet of the drain pump 10 is connected to the drain outlet pipe 13 of the steam-water separator 7 through a pipeline, and the drain pump 10 is used for conveying the drain to the unit regenerative system.
In this embodiment, preheater 5 can produce 150 ℃ high temperature water through the slot type condenser that the spotlight ratio is 25, and steam generator 6 can produce 300 ℃ high temperature water through the slot type condenser that the spotlight ratio is 40, and superheater 8 can produce 500 ℃ high temperature water through the slot type condenser that the spotlight ratio is 100.
In the embodiment, the supercooled water sequentially passes through the preheater 5, the steam generator 6, the steam-water separator 7 and the superheater 8, the supercooled water flows through the preheater 5 at a high flow rate and is preheated in the preheater 5, water at the tail end of the preheater 5 is conveyed to an inlet of the preheater 5 through a pipeline and a recirculation adjusting valve 9 and is heated again to improve the temperature of the supercooled water in the preheater 5, the temperature of the supercooled water in the preheater 5 is controlled through the opening degree of the recirculation adjusting valve 9, the supercooled water flows to the steam generator 6 after being preheated in the preheater 5, wet steam is generated in the steam generator 6, a steam-liquid two-phase flow is generated at the tail end of an evaporation part and enters the steam-water separator 7 at the tail end of the evaporation part for steam-water separation, the steam that separates gets into over heater 8 and further heated to required temperature, this application is through linking to each other catch water 7 with steam generator 6, the wet steam that steam generator 6 produced gets into catch water 7 by the tedge, the light in-process that up walks of hot water quality exchanges the heat, partly water transformation becomes the gaseous state, after being used for the heat treatment through over heater 8, the steam after with the heat treatment is used for the steam turbine electricity generation, thereby reduce the power generation cost, the hydrophobic through downcomer connection drain pump under the action of gravity of the hydrophobic of catch water 7 separation, pressurize to the unit system of heating back by the drain pump.
In this embodiment, this application carries the unit regenerative system with producing the higher hydrophobic delivery of temperature in the catch water, and this can guarantee that subcooled water unidirectional flow in preheater 5, steam generator 6, catch water 7 and over heater 8, can make the heat transfer of intraductal working medium flow more stable through the scheme of this application, and system outlet superheated steam parameter is easily controlled to the hidden danger that the two-phase flow brought has been eliminated.
As shown in fig. 5, in some embodiments of the present application, the steam-water separator 7 includes:
the steam trap comprises a shell 11, wherein a steam outlet pipe 12, a drainage outlet pipe 13 and a water inlet pipe 14 are arranged on the shell 11;
the enclosing plate partition 15 is arranged in the shell 11, and the outer diameter size of the enclosing plate partition 15 is the same as the inner diameter size of the shell 11;
the separator 16 is arranged on the side wall of the enclosing plate partition 15, and the separator 16 is used for steam-water separation treatment;
a louver 17 disposed above the separator 16, the louver 17 for introducing the steam into the steam outlet pipe 12;
a drying chamber 18 disposed between the inner wall of the housing and the louver 17, the drying chamber 18 being used for drying the steam.
In some embodiments of the present application, the steam-water separator 7 further comprises:
a mist eliminator 19 provided on a side wall of the separator 16, the mist eliminator 19 for removing water droplets from the steam;
a water level gauge 20 disposed inside the housing 11, the water level gauge 20 indicating a level of water drained in the housing 11.
In this embodiment, the steam-water mixture from the superheater 8 enters the steam-water separator through the water inlet pipe 14 (two water inlet pipes 14) on the upper part of the steam-water separator 7, flows down along the narrow annular channel formed by the inner wall of the steam-water separator and the wave-shaped partition plate 15, and enters the separators 16 respectively, and the inertial separation is performed by using the inertia when the flow direction is changed, which is the first separation of the steam-water mixture. The separated steam still has a lot of moisture, enter the louver 17 from the top of the separator, it is mounted on the top of the separator 16, the steam with some water droplets flows in the gap among the wave-shaped surrounding baffle 15, utilize and make water adhere to the metal wall surface and form the water film and flow downward, carry on the secondary separation, the steam after the secondary separation is washed through the steam finally, utilize the density difference of the water to carry on the gravity separation, this is the tertiary separation, the steam enters the drying chamber 18 after the tertiary separation, flow out to the superheater 8 from the steam outlet pipe 12 of the top of the steam-water separator 7 further to heat, this application can further improve the steam quality standard through the steam-water separator 7, guarantee the normal operation of the steam turbine to generate electricity.
In some embodiments of the present application, as shown in fig. 6, the thermal storage subsystem comprises:
a cold molten salt tank 21 for storing molten salt that has not been subjected to high temperature treatment;
a low-temperature molten salt pump 22, an inlet of the low-temperature molten salt pump 22 being connected to an outlet of the cold molten salt tank 21 through a pipeline, the low-temperature molten salt pump 22 being used for conveying the molten salt which is not subjected to high-temperature treatment;
the inlet of the high-voltage electric heater 23 is connected to the outlet of the low-temperature molten salt pump 22 through a pipeline, and the high-voltage electric heater 23 is used for performing high-temperature heating treatment on the molten salt which is not subjected to high-temperature treatment;
an inlet of the hot melt salt tank 24 is connected to an outlet of the high-voltage electric heater 23 through a pipeline, and the hot melt salt tank 24 is used for storing molten salt subjected to high-temperature heating treatment;
the inlet of the high-temperature molten salt pump 25 is connected to the outlet of the hot molten salt tank 24 through a pipeline, and the high-temperature molten salt pump 25 is used for conveying the molten salt subjected to high-temperature heating treatment;
a steam separator 26, an inlet of the steam separator 26 is connected to an outlet of the high temperature molten salt pump 25 through a pipeline, an outlet of the steam separator 26 is connected to an inlet of the cold molten salt tank 21 through a pipeline, and the steam separator 26 is used for separating the feed water in the steam separator 26 into high temperature steam according to the molten salt after the high temperature heating treatment.
In some embodiments of the present application, the thermal storage subsystem further comprises:
and an adjustment valve 27 provided between the high-temperature molten salt pump 25 and the steam separator 26, wherein the adjustment valve 27 is configured to adjust the transport amount of the molten salt after the high-temperature heating treatment.
In the embodiment, the diameter of the cold molten salt tank 21 and the diameter of the hot molten salt tank 24 are 5.4 meters and 6 meters, the consumption of the molten salt is 600 tons, the heat storage capacity is 60MWh, the working temperature of the molten salt is 200-500 ℃, and the maximum power of the electric heater is 6000kW. The heat storage molten salt is binary salt (60% of sodium nitrate and 40% of potassium nitrate), the melting point of the heat storage molten salt is 220 ℃, and the maximum working temperature can reach 600 ℃. The method is characterized in that a cold molten salt tank 21 and a hot molten salt tank 24 are adopted to store molten salt, the molten salt in the cold molten salt tank 21 is conveyed into a 6kv high-voltage electric heater 23 through a low-temperature molten salt pump 22, absorbs heat energy, is heated and then enters the hot molten salt tank 24, then the high-temperature molten salt is pressurized and flows into a steam separator 26 through a high-temperature molten salt pump 25, the feed water is heated to generate superheated steam, the superheated steam is used as a standby heat source to drive a steam turbine to operate and generate power for peak regulation of a unit, and the molten salt flows back to the cold molten salt tank 21 after the temperature of the molten salt is reduced.
In the embodiment, because the light-gathering and heat-collecting subsystem can not collect heat at night, the heat storage subsystem can be used for solving the problem of supplying power to the system at night, on a cloudy day or under other conditions without sunlight irradiation, the heat storage subsystem in the application stores a large amount of heat by using molten salt, the molten salt is a eutectic mixture consisting of 60% of sodium nitrate and 40% of potassium nitrate, the melting heat of the molten salt is 161J/g, and the heat capacity is 1.53J/(gK), the molten salt is heated by the high-pressure electric heater 23, and finally the temperature of the molten salt reaches 566 ℃ and is stored in the hot-melt salt tank 24, the heat energy can be effectively stored for a week, when the molten salt is required to generate power or dissipate heat, the high-temperature molten salt is guided out and is sent to the traditional steam separator 26 through the high-temperature molten salt pump 25 to generate high-temperature and high-pressure superheated steam, so as to drive the steam turbine separator to generate power.
In some embodiments of the present application, further comprising:
a heat source switching control device for controlling switching between the heat storage subsystem and the auxiliary power generation subsystem.
In the embodiment, the auxiliary power generation subsystem is used as an auxiliary heat source, the output heat and the boiler heat of the power plant drive conventional power generation equipment together, and a special heat source switching control device is configured for switching between the solar auxiliary power generation subsystem and the heat storage subsystem, so that the normal operation of the system is further ensured, and the operation reliability of the system is improved.
To sum up, the embodiment of the invention discloses a trough type DSG solar heat collection auxiliary power generation device for a power plant, which comprises: the system comprises a light-gathering and heat-collecting subsystem, a heat exchange subsystem, a heat storage subsystem and an auxiliary power generation subsystem, wherein the light-gathering and heat-collecting subsystem is used for tracking and reflecting sunlight, the heat exchange subsystem is connected with the light-gathering and heat-collecting subsystem and is used for controlling a steam turbine to generate power, the heat storage subsystem is used for storing energy and driving the stored energy to generate power by the steam turbine, and the auxiliary power generation subsystem is used for assisting the steam turbine to generate power.
Particularly, the invention utilizes the steam-water separator to carry out steam-water separation, the separated steam enters the superheater to be further heated to the required temperature, the steam-water separator generates hydrophobic water with higher temperature and the hydrophobic water is conveyed to the unit regenerative system by utilizing the hydrophobic pump, thus ensuring the unidirectional flow of the working medium of the water heating section and the steam superheated section.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention can be used in any combination with one another as long as no structural conflict exists, and all combinations that do not exist are described in this specification solely for the sake of brevity and resource savings. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a power plant is with supplementary power generation facility of slot type DSG solar energy collection which characterized in that, the device includes:
the light and heat collecting subsystem is used for tracking reflected sunlight;
the heat exchange subsystem is connected with the light and heat gathering subsystem and is used for controlling a steam turbine to generate electricity;
the heat storage subsystem is used for storing energy and using the stored energy to drive the steam turbine to generate electricity;
and the auxiliary power generation subsystem is used for assisting the steam turbine to generate power.
2. The trough DSG solar heat collection auxiliary power generation device for the power plant of claim 1, wherein the light and heat collection subsystem comprises:
an aluminum parabolic reflector for reflecting sunlight incident rays into sunlight reflected rays;
the heat collecting pipe is used for absorbing solar radiation energy generated by the sunlight reflected light and heating the supercooled water in the heat collecting pipe according to the solar radiation energy;
and the tracking device is used for tracking the incident rays of the sunlight.
3. The trough DSG solar energy collection auxiliary power generation device for power plants of claim 2, wherein the heat exchange subsystem comprises:
the circulating water pump is used for conveying the supercooled water in the heat collecting pipe;
the inlet of the preheater is connected to the outlet of the circulating water pump through a pipeline, and the preheater is used for preheating the supercooled water;
the inlet of the steam generator is connected to the outlet of the preheater through a pipeline, and the steam generator is used for carrying out secondary heating treatment on the supercooled water after the preheating treatment and generating wet steam;
the water inlet pipe of the steam-water separator is connected to the outlet of the steam generator through a pipeline, and the steam-water separator is used for performing steam-water separation treatment on the wet steam to obtain steam and hydrophobic water;
and the inlet of the superheater is connected to a steam outlet pipe of the steam-water separator through a pipeline, and the superheater is used for heating the steam and controlling a steam turbine to generate power according to the steam after heating treatment.
4. The trough DSG solar energy collection auxiliary power generation device for the power plant of claim 3, wherein the heat exchange subsystem further comprises:
and one end of the recirculation adjusting valve is connected to the inlet of the preheater, the other end of the recirculation adjusting valve is connected to the outlet of the preheater, and the recirculation adjusting valve is used for controlling the preheating temperature of the supercooled water in the preheater.
5. The trough DSG solar energy collection auxiliary power generation device for power plants of claim 3, wherein the heat exchange subsystem further comprises:
and the inlet of the drain pump is connected to the drain outlet pipe of the steam-water separator through a pipeline, and the drain pump is used for conveying the drain to the unit regenerative system.
6. The trough DSG solar heat collection auxiliary power generation device for the power plant of claim 3, wherein the steam-water separator comprises:
the steam trap comprises a shell, wherein a steam outlet pipe, a drainage outlet pipe and a water inlet pipe are arranged on the shell;
the surrounding plate separator is arranged in the shell, and the outer diameter size of the surrounding plate separator is the same as the inner diameter size of the shell;
the separator is arranged on the side wall of the enclosing plate, and is used for performing steam-water separation treatment;
a shutter disposed above the separator, the shutter for introducing the steam into the steam outlet pipe;
and the drying chamber is arranged between the inner wall of the shell and the shutter and is used for drying the steam.
7. The trough-type DSG solar heat collection auxiliary power generation device for the power plant according to claim 6, wherein the steam-water separator further comprises:
a mist eliminator disposed on a sidewall of the separator, the mist eliminator configured to remove water droplets from the steam;
a water level gauge disposed within the housing, the water level gauge for indicating a level of water that is hydrophobic in the housing.
8. The trough DSG solar thermal collection auxiliary power plant according to claim 1, wherein the thermal storage subsystem comprises:
the cold molten salt tank is used for storing molten salt which is not subjected to high-temperature treatment;
the inlet of the low-temperature molten salt pump is connected to the outlet of the cold molten salt tank through a pipeline, and the low-temperature molten salt pump is used for conveying the molten salt which is not subjected to high-temperature treatment;
the inlet of the high-voltage electric heater is connected to the outlet of the low-temperature molten salt pump through a pipeline, and the high-voltage electric heater is used for carrying out high-temperature heating treatment on the molten salt which is not subjected to high-temperature treatment;
an inlet of the hot-melt salt tank is connected to an outlet of the high-voltage electric heater through a pipeline, and the hot-melt salt tank is used for storing molten salt subjected to high-temperature heating treatment;
the inlet of the high-temperature molten salt pump is connected to the outlet of the hot molten salt tank through a pipeline, and the high-temperature molten salt pump is used for conveying the molten salt subjected to high-temperature heating treatment;
and an inlet of the steam separator is connected to an outlet of the high-temperature molten salt pump through a pipeline, an outlet of the steam separator is connected to an inlet of the cold molten salt tank through a pipeline, and the steam separator is used for separating feed water in the steam separator into high-temperature steam according to the molten salt subjected to high-temperature heating treatment.
9. The trough DSG solar thermal collection auxiliary power plant of claim 8, wherein the thermal storage subsystem further comprises:
and the adjusting valve is arranged between the high-temperature molten salt pump and the steam separator and is used for adjusting the conveying amount of the molten salt subjected to high-temperature heating treatment.
10. The trough-type DSG solar heat collection auxiliary power generation device for the power plant according to claim 1, further comprising:
a heat source switching control device for controlling switching between the heat storage subsystem and the auxiliary power generation subsystem.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211161526.9A CN115596629A (en) | 2022-09-22 | 2022-09-22 | Trough type DSG solar heat collection auxiliary power generation device for power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211161526.9A CN115596629A (en) | 2022-09-22 | 2022-09-22 | Trough type DSG solar heat collection auxiliary power generation device for power plant |
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| CN202211161526.9A Pending CN115596629A (en) | 2022-09-22 | 2022-09-22 | Trough type DSG solar heat collection auxiliary power generation device for power plant |
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| Country | Link |
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| CN (1) | CN115596629A (en) |
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- 2022-09-22 CN CN202211161526.9A patent/CN115596629A/en active Pending
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