CN115468321B - A solar cascade utilization combined heat and power system and method - Google Patents
A solar cascade utilization combined heat and power system and methodInfo
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- CN115468321B CN115468321B CN202211270266.9A CN202211270266A CN115468321B CN 115468321 B CN115468321 B CN 115468321B CN 202211270266 A CN202211270266 A CN 202211270266A CN 115468321 B CN115468321 B CN 115468321B
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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
- F24S60/20—Arrangements for storing heat collected by solar heat collectors using chemical reactions, e.g. thermochemical reactions or isomerisation reactions
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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
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/0015—Domestic hot-water supply systems using solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D18/00—Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
- F24D19/1057—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water the system uses solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2101/00—Electric generators of small-scale CHP systems
- F24D2101/10—Gas turbines; Steam engines or steam turbines; Water turbines, e.g. located in water pipes
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention belongs to the technical field of solar energy utilization, and relates to an electric heating steam combined supply system and method for solar energy cascade utilization. The system comprises a first hot water supply subsystem, a heat exchange subsystem, a second hot water supply subsystem, a steam supply power generation subsystem and a photovoltaic power generation subsystem, wherein the photovoltaic power generation subsystem is respectively connected with the first hot water supply subsystem, the heat exchange subsystem, the second hot water supply subsystem and the steam supply power generation subsystem. The invention can use solar energy in a gradient way, can use solar energy gradient to provide hot water with high, medium and low temperatures, can also gradient provide steam with high, medium and low parameters, and uses the generated steam to generate electricity, thereby fully utilizing the solar energy, and having the advantages of less investment of the system and low cost. And when the sunlight is insufficient, spare equipment is arranged in each subsystem so as to ensure the supply of hot water and steam with various temperatures and parameters and ensure the normal operation of the system.
Description
Technical Field
The invention belongs to the technical field of solar energy utilization, and particularly relates to an electric heating steam combined supply system and method for solar energy cascade utilization.
Background
The heavy use and excessive exploitation of coal and petroleum causes serious environmental pollution and energy shortage. Environmental pollution and energy crisis have seriously threatened human survival and development, so how to utilize solar energy and efficiently utilize solar energy are subjects worth researching.
There are some researches on utilizing solar energy, for example, chinese patent with application number of cn202010221321.X, which discloses a solar air source heat pump triple supply system and a use method, the system comprises an air source heat pump mechanism, a solar heat collecting mechanism, a first heat exchanger and a second heat exchanger, the air source heat pump mechanism comprises a compressor, a four-way reversing valve, an indoor unit air-cooled heat exchanger, a drying pipe, a throttling device and an outdoor unit air-cooled heat exchanger, the solar heat collecting mechanism comprises a low-temperature water tank, a first valve, a high-temperature water tank, a solar heat collecting plate, a second valve, a third water pump and a fourth water pump, the interior of the low-temperature water tank is connected with the inner cavity of the first heat exchanger through the second water pump, and the interior of the high-temperature water tank is connected with the inner cavity of the second heat exchanger through the first water pump. The combined supply system in the patent utilizes solar energy to realize the combined supply of heating, cooling and domestic hot water, but the combined supply system in the patent can not realize the supply of hot water with different temperatures and steam with different parameters, can not realize the power generation, and can not realize the higher efficient cascade utilization of the solar energy.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an electric heating steam combined supply system and a method for solar energy cascade utilization, which can realize the supply of hot water with different temperatures and steam with different parameters, can also realize the power generation, and can perform efficient cascade utilization on solar energy.
The invention adopts the following technical scheme:
The solar cascade utilization electric heating steam combined supply system comprises a first hot water supply subsystem, a heat exchange subsystem, a second hot water supply subsystem, a steam supply power generation subsystem and a photovoltaic power generation subsystem, wherein the photovoltaic power generation subsystem is respectively connected with the first hot water supply subsystem, the heat exchange subsystem, the second hot water supply subsystem and the steam supply power generation subsystem;
the first hot water supply subsystem comprises a water source supply module, a solar heat collector, a low-temperature hot water storage module and a medium-temperature hot water storage module;
The solar heat collector comprises a solar primary heating sub-module and a solar secondary heating sub-module which are connected through pipelines, wherein a water source supply module is connected with the solar primary heating sub-module through a pipeline, the solar primary heating sub-module is also connected with a low-temperature hot water storage module through a pipeline, and the solar secondary heating sub-module is also connected with a medium-temperature hot water storage module through a pipeline;
The heat exchange subsystem comprises a light condensation heat collector, a molten salt storage tank and a heat exchanger, wherein the light condensation heat collector is connected with the molten salt storage tank through a pipeline, the light condensation heat collector is also connected with a heat source end pipeline of the heat exchanger, the inlet of the heat exchange end of the heat exchanger is connected with a solar secondary heating submodule through a pipeline, the outlet of the heat exchange end of the heat exchanger is connected with a high-temperature hot water storage module pipeline in the second hot water supply subsystem, and the outlet of the heat exchange end of the heat exchanger is also connected with a steam supply power generation subsystem through a pipeline;
The steam supply power generation subsystem comprises a steam generator and a back pressure steam turbine which are connected through pipelines, and further comprises a generator connected with the back pressure steam turbine, wherein a high-pressure steam output pipeline is arranged at the pipeline connection part of the steam generator and the back pressure steam turbine, a body extraction opening and a steam turbine outlet are arranged on the back pressure steam turbine, the body extraction opening is connected with the medium-pressure steam output pipeline, and the steam turbine outlet is connected with the low-pressure steam output pipeline.
As a preferred scheme, the photovoltaic power generation subsystem comprises a photovoltaic power generation module, an energy storage module and a power transmission module which are sequentially connected, and the power transmission module is connected with an external power utilization module.
Preferably, the power transmission module is further connected with an external power taking module.
As a preferred scheme, an output pipeline and an input pipeline are branched at the connecting pipeline of the water source supply module and the solar primary heating sub-module, a first valve is arranged on the output pipeline, a second valve is arranged on the input pipeline, a third valve is arranged at the position, between the output pipeline and the input pipeline, of the connecting pipeline of the water source supply module and the solar primary heating sub-module, the low-temperature heat pump is respectively connected with the output pipeline and the input pipeline, and the low-temperature heat pump is also connected with the photovoltaic power generation subsystem and the generator.
As a preferred scheme, the solar secondary heating sub-module is connected with a first inlet pipeline of the thermal deaerator, an outlet of the thermal deaerator is connected with a heat exchange end inlet pipeline of the heat exchanger, and a second inlet of the thermal deaerator is connected with a low-pressure steam output pipeline.
As a preferred scheme, the heat exchange subsystem further comprises an electrode type molten salt boiler, the electrode type molten salt boiler is connected with the molten salt storage tank through a pipeline, and the electrode type molten salt boiler is connected with the photovoltaic power generation subsystem and the generator.
As the preferable scheme, the outlet of the heat exchange end of the heat exchanger is also connected with an electric steam boiler pipeline, the electric steam boiler is also connected with a high-pressure steam output pipeline, and the electric steam boiler is also connected with a photovoltaic power generation subsystem and a generator.
As a preferred scheme, the low-temperature hot water storage module comprises a low-temperature heat storage water tank and a low-temperature hot water output pipeline which are connected, wherein a low-temperature water supply pump is arranged on the low-temperature hot water output pipeline and is connected with the photovoltaic power generation subsystem and the generator;
The medium-temperature hot water storage module comprises a medium-temperature heat storage water tank and a medium-temperature hot water output pipeline which are connected, a medium-temperature water supply pump is arranged on the medium-temperature hot water output pipeline, and the medium-temperature water supply pump is connected with the photovoltaic power generation subsystem and the power generator;
The high-temperature hot water storage module comprises a high-temperature heat storage water tank and a high-temperature hot water output pipeline which are connected, wherein a high-temperature water supply pump is arranged on the high-temperature hot water output pipeline and is connected with the photovoltaic power generation subsystem and the generator.
The invention also provides an electric heating steam combined supply method for solar cascade utilization, which is based on the electric heating steam combined supply system for solar cascade utilization and comprises the following steps:
s1, a water source supply module supplies water source to a solar primary heating sub-module in a solar heat collector for primary heating so as to obtain low-temperature hot water;
S2, conveying part of low-temperature hot water to a low-temperature hot water storage module for storage, and conveying the rest of low-temperature hot water to a solar secondary heating submodule for further heating so as to obtain middle-temperature hot water;
s3, conveying part of the medium-temperature hot water to a medium-temperature hot water storage module for storage, conveying the rest of the medium-temperature hot water to a heat exchanger in a heat exchange subsystem, and exchanging heat with molten salt heated by a concentrating heat collector to obtain high-temperature hot water;
s4, conveying part of the high-temperature hot water to a high-temperature hot water storage module for storage, and conveying the rest of the high-temperature hot water to a steam generator for evaporation to obtain high-parameter steam;
S5, outputting part of high-parameter steam through a high-parameter steam output pipeline, conveying the rest of high-parameter steam to a back pressure steam turbine, outputting medium-parameter steam through a medium-parameter steam output pipeline by a body extraction opening of the back pressure steam turbine, outputting low-parameter steam through a low-parameter steam output pipeline by a steam turbine outlet of the back pressure steam turbine, and driving a generator to generate power while outputting the steam by the back pressure steam turbine.
In the step S3, the rest of the intermediate-temperature hot water is fed to the heat exchanger in the heat exchange subsystem and is subjected to thermal deoxidation by the thermal deaerator, and the thermal source of the thermal deaerator is low-parameter steam output from the turbine outlet of the back pressure turbine through the low-parameter steam output pipeline.
The beneficial effects of the invention are as follows:
The invention can use solar energy in a gradient way, can use solar energy gradient to provide hot water with high, medium and low temperatures, can also gradient provide steam with high, medium and low parameters, and uses the generated steam to generate electricity, thereby fully utilizing solar energy.
The primary solar heating sub-module in the solar heat collector is used for primarily heating water to obtain low-temperature hot water, and the secondary solar heating sub-module in the solar heat collector is used for further heating low-temperature hot water to obtain medium-temperature hot water. Because the solar heat collector has temperature limitation on heating water, the heat exchange subsystem is arranged in the invention, the fused salt is heated through the light-gathering heat collector, and the heated fused salt is used for carrying out heat transfer on the intermediate-temperature hot water so as to further improve the water temperature, and the operation cost of the light-gathering heat collector is higher than that of the solar heat collector.
The invention can produce high, medium and low parameter steam through the steam generator and the back pressure steam turbine, and the medium and low parameter steam can be output through the main body extraction opening and the steam turbine outlet arranged on the back pressure steam turbine, and the generator can be directly driven to generate power while the medium and low parameter steam is produced by the back pressure steam turbine, thereby truly realizing full and cascade utilization of energy, and having less investment of a system and low cost.
The photovoltaic power generation subsystem comprises a photovoltaic power generation module, an energy storage module and a power transmission module which are sequentially connected, wherein the power transmission module is connected with an external power utilization module, and the power transmission module is also connected with an external power taking module. The photovoltaic power generation subsystem can store the electric energy generated by photovoltaic power generation in the energy storage module for standby, can output the electric energy to the external power utilization module for utilization, and can also take electricity through the external power taking module when the electric energy in the combined power supply system is insufficient.
According to the invention, the low-temperature heat pump is arranged, when the sunlight is insufficient, the first valve, the second valve and the third valve are controlled to be opened and closed, so that the low-temperature heat pump is used as a standby heat source to heat water, and as the low-temperature heat pump is connected with the photovoltaic power generation subsystem, the system can work through electricity stored by the energy storage module or low-temperature electricity obtained by the external electricity taking module whenever possible, and the normal operation of the system is ensured.
The thermal deaerator is arranged in the invention to remove oxygen in hot water, thus laying a foundation for subsequent steam production and power generation. And the thermal source of the thermal deaerator is low-parameter steam output by the back pressure steam turbine, so that more full utilization of energy is realized.
The heat exchange subsystem is also provided with the electrode type molten salt boiler, the electrode type molten salt boiler is connected with the molten salt storage tank through a pipeline, and the electrode type molten salt boiler is connected with the photovoltaic power generation subsystem and the generator, so that the electrode type molten salt boiler can be used as a standby heat source for heating molten salt when the sunlight is insufficient, and the normal operation of the system is ensured.
In the invention, the outlet of the heat exchange end of the heat exchanger is also connected with an electric steam boiler pipeline, the electric steam boiler is also connected with a high-pressure steam output pipeline, and the electric steam boiler is also connected with a photovoltaic power generation subsystem and a generator. When the sun light is insufficient, the water temperature is insufficient (here, it is considered that the electrode type molten salt boiler still does not operate although the sun light is insufficient), and the steam generator has limited power and cannot generate steam with required parameters, so that high-parameter steam is generated through the electric steam boiler with higher power, and the high-parameter steam is converged and output with the steam generated by the steam generator through the high-pressure steam output pipeline.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a solar cascade utilization electric heating steam combined supply system according to the present invention;
FIG. 2 is a flow chart of an electrothermal steam combined supply method for solar cascade utilization according to the invention;
In the figure: 1, a softening water tank, 2, a low-temperature water supply pump, 3, a low-temperature heat pump, 4-1, a first valve, 4-2, a third valve, 4-3, a second valve, 5, a solar heat collector, 6, a low-temperature heat storage water tank, 7, a low-temperature water supply pump, 8, a medium-temperature heat storage water tank, 9, a medium-temperature water supply pump, 10, a medium-temperature water supply pump, 11, a thermal deaerator, 111, a thermal deaerator first inlet, 112, a thermal deaerator outlet, 113, a thermal deaerator second inlet, 12, a heat exchanger, 121, a heat exchanger heat source end inlet, 122, a heat exchanger heat source end outlet, 123, a heat exchanger heat exchange end outlet, 124, a heat exchanger heat exchange end inlet, 13, a concentrating heat collector, 14, an electrode molten salt boiler, 15 and a molten salt storage tank, 16, a low-temperature molten salt pump, 17, a high-temperature molten salt pump, 18, a high-temperature heat storage water tank, 19, a high-temperature water supply pump, 20, a steam generator, 21, an electric steam boiler, 22, a back pressure steam turbine, 221, a back pressure steam turbine inlet, 222, a body extraction opening, 223, a steam turbine outlet, 23, a generator, 24, a photovoltaic power generation module, 25, an energy storage module, 26, a power transmission module, a softened water pipeline, b, a low-temperature return water pipeline, c, a low-temperature hot water output pipeline, d, a medium-temperature return water pipeline, e, a medium-temperature hot water output pipeline, f, a high-temperature return water pipeline, g, a high-parameter steam output pipeline, h, a medium-parameter steam output pipeline, k, a low-parameter steam output pipeline, L and a high-temperature hot water output pipeline.
Detailed Description
The following specific examples are presented to illustrate the present invention, and those skilled in the art will readily appreciate the additional advantages and capabilities of the present invention as disclosed herein. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
Embodiment one:
Referring to fig. 1, the present embodiment provides an electrothermal steam combined supply system for cascade utilization of solar energy, which includes a first hot water supply subsystem, a heat exchange subsystem, a second hot water supply subsystem, a steam supply power generation subsystem, and a photovoltaic power generation subsystem, wherein the photovoltaic power generation subsystem is respectively connected with the first hot water supply subsystem, the heat exchange subsystem, the second hot water supply subsystem, and the steam supply power generation subsystem to provide electric energy, including providing electric energy for each pump body, and also providing electric energy for a low-temperature heat pump 3, an electrode type molten salt boiler 14, and an electric steam boiler 21, which will be described later;
The first hot water supply subsystem comprises a water source supply module, a solar heat collector 5, a low-temperature hot water storage module and a medium-temperature hot water storage module;
In this embodiment, the water source supply module includes a softened water pipe a, a softened water tank 1, and a low temperature water supply pump 2. The low-temperature hot water storage module comprises a low-temperature hot water storage tank 6, a low-temperature hot water output pipeline c and a low-temperature water supply pump 7 arranged on the low-temperature hot water output pipeline c. The medium-temperature hot water storage module comprises a medium-temperature heat storage water tank 8, a medium-temperature hot water output pipeline e and a medium-temperature water supply pump 9 arranged on the medium-temperature hot water output pipeline e.
The solar heat collector 5 comprises a solar primary heating sub-module and a solar secondary heating sub-module which are connected through pipelines, the softened water tank 1 in the water source supply module is connected with the solar primary heating sub-module through a pipeline, a low-temperature water supply pump 2 and a low-temperature water return pipeline b are arranged at the pipeline connection position, the solar primary heating sub-module is also connected with the low-temperature heat storage water tank 6 in the low-temperature water storage module through a pipeline, and the solar secondary heating sub-module is also connected with the medium-temperature heat storage water tank 8 in the medium-temperature water storage module through a pipeline.
The heat exchange subsystem comprises a light-gathering heat collector 13, a molten salt storage tank 15 and a heat exchanger 12, wherein the light-gathering heat collector 5 is connected with the molten salt storage tank 15 through a pipeline, the light-gathering heat collector 13 is also connected with a heat source end pipeline of the heat exchanger 12, a heat exchange end inlet 124 of the heat exchanger is connected with a solar secondary heating submodule through a pipeline, a heat exchange end outlet 123 of the heat exchanger is connected with a high-temperature hot water storage module pipeline in the second hot water supply subsystem, and a heat exchange end outlet 123 of the heat exchanger is also connected with a steam supply power generation subsystem through a pipeline;
The steam supply power generation subsystem comprises a steam generator 20 and a back pressure steam turbine 22 which are connected through pipelines, and further comprises a generator 23 connected with the back pressure steam turbine 22, wherein a high-parameter steam output pipeline g is arranged at the pipeline connection position of the steam generator 20 and the back pressure steam turbine 22, the back pressure steam turbine 22 is provided with a body extraction opening 222 and a steam turbine outlet 223, the body extraction opening 222 is connected with a medium-parameter steam output pipeline h, and the steam turbine outlet 223 is connected with a low-parameter steam output pipeline k. Wherein the temperature and pressure of the low-parameter steam are lower, and the temperature and pressure of the high-parameter steam are higher.
The invention can use solar energy in a gradient way, can use solar energy gradient to provide hot water with high, medium and low temperatures, can also gradient provide steam with high, medium and low parameters, and uses the generated steam to generate electricity, thereby fully utilizing solar energy.
The primary solar heating sub-module in the solar heat collector 5 is used for primarily heating water, so that low-temperature hot water is obtained, and the secondary solar heating sub-module in the solar heat collector 5 is used for further heating low-temperature hot water, so that middle-temperature hot water is obtained. Because the solar heat collector 5 has temperature limitation on heating water, the heat exchange subsystem is arranged in the invention, the molten salt is heated through the concentrating heat collector 13, and the heated molten salt is used for carrying out heat transfer on the medium-temperature hot water so as to further improve the water temperature, and the operation cost of the concentrating heat collector 13 is higher than that of the solar heat collector 5, so that the heating of the low-temperature hot water and the medium-temperature hot water is carried out through the solar heat collector 5, and the concentrating heat collector 13 only carries out the heating of the high-temperature hot water, thereby reducing the operation cost of the system.
The invention can produce high, medium and low parameter steam through the steam generator 20 and the back pressure steam turbine 22, and the medium and low parameter steam can be output through the main body extraction opening 222 and the steam turbine outlet 223 which are arranged on the back pressure steam turbine 22, and the generator 23 can be directly driven to generate power while the medium and low parameter steam is produced by the back pressure steam turbine 22, thereby truly realizing the full and cascade utilization of energy.
The photovoltaic power generation subsystem comprises a photovoltaic power generation module 24, an energy storage module 25 and a power transmission module 26 which are sequentially connected, wherein the power transmission module 26 is connected with an external power utilization module, and the power transmission module 26 is also connected with an external power taking module. That is, the photovoltaic power generation subsystem of the invention can store the electric energy generated by photovoltaic power generation in the energy storage module 25 for standby, and can output the electric energy to the external power utilization module for utilization, and when the electric energy in the combined power supply system is insufficient, the electric energy can be taken through the external power taking module.
It should be noted that, in this embodiment, the output end of the generator 23 is connected to a photovoltaic power generation subsystem, and the generated electric energy can be supplied to each subsystem in the combined supply system as well, or can be transmitted to the energy storage module 25 for storage.
More specifically:
The water source supply module is characterized in that an output pipeline and an input pipeline are branched at the connection pipeline of the softening water tank 1 and the solar primary heating sub-module, a first valve 4-1 is arranged on the output pipeline, a second valve 4-2 is arranged on the input pipeline, a third valve 4-2 is arranged at the position, between the output pipeline and the input pipeline, of the connection pipeline of the softening water tank 1 and the solar primary heating sub-module, the low temperature heat pump 3 is respectively connected with the output pipeline and the input pipeline, and the low temperature heat pump 3 is also connected with the photovoltaic power generation subsystem and the generator 23.
That is, when the sunlight is insufficient, the first valve 4-1 and the second valve 4-3 are controlled to be opened, and the third valve 4-2 is controlled to be closed, so that the low-temperature heat pump 3 is used as a standby heat source to heat water first, and the low-temperature heat pump 3 is connected with the photovoltaic power generation subsystem, so that the system can work through electricity stored by the energy storage module 25 or off-peak electricity obtained by the external electricity taking module whenever possible, and the normal operation of the system is ensured. When the sun light is sufficient, the first valve 4-1 and the second valve 4-3 are closed, and the third valve 4-2 is opened.
The solar secondary heating submodule is connected with a first inlet 111 of the thermal deaerator in a pipeline manner, an outlet 112 of the thermal deaerator is connected with a heat exchange end inlet 124 of the heat exchanger in a pipeline manner, and a second inlet 113 of the thermal deaerator is connected with a low-parameter steam output pipeline k in a pipeline manner.
Namely, the thermal deaerator 11 is arranged in the invention to remove oxygen in the hot water, thereby laying a foundation for subsequent steam production and power generation. And the thermal source of the thermal deaerator 11 is low-parameter steam output by the back pressure turbine 22 so as to realize more full utilization of energy.
The heat exchange subsystem further comprises an electrode type molten salt boiler 14, the electrode type molten salt boiler 14 is connected with the molten salt storage tank 15 through a pipeline, and the electrode type molten salt boiler 14 is connected with the photovoltaic power generation subsystem and the generator 23.
That is, the heat exchange subsystem is also provided with the electrode type molten salt boiler 14, the electrode type molten salt boiler 14 is connected with the molten salt storage tank 15 through a pipeline, and the electrode type molten salt boiler 14 is connected with the photovoltaic power generation subsystem and the generator 23, so that the electrode type molten salt boiler 14 can be used as a standby heat source for heating molten salt when the solar illumination is insufficient, and the normal operation of the system is ensured.
The heat exchange end outlet 123 of the heat exchanger is also connected with a pipeline of the electric steam boiler 21, the electric steam boiler 21 is also connected with a pipeline of the high-parameter steam output pipeline g, and the electric steam boiler 21 is also connected with the photovoltaic power generation subsystem and the generator 23.
That is, in the present invention, the heat exchange end outlet 123 of the heat exchanger is further connected to the electric steam boiler 21 through a pipeline, the electric steam boiler 21 is further connected to the high pressure steam output pipeline g through a pipeline, and the electric steam boiler 21 is further connected to the photovoltaic power generation subsystem and the generator 23. When the solar light is insufficient, the water temperature is insufficient (here, it is considered that the electrode type molten salt boiler 14 is still not operated although the solar light is insufficient), and the steam generator 20 has limited power and cannot generate the steam with the required parameters, the high-parameter steam is generated by the electric steam boiler 21 with higher power, and the high-parameter steam is collected and output with the steam generated by the steam generator 20 through the high-pressure steam output pipeline g.
Referring to fig. 1, in the drawing, a low-temperature water return pipeline b and a medium-temperature water return pipeline d are all provided with a water return function.
Embodiment two:
referring to fig. 2, the present embodiment provides a solar cascade utilization electric heating steam combined supply method, which is based on the solar cascade utilization electric heating steam combined supply system of the first embodiment, and includes the steps of:
s1, a water source supply module supplies water source to a solar primary heating sub-module in a solar heat collector for primary heating so as to obtain low-temperature hot water;
S2, conveying part of low-temperature hot water to a low-temperature hot water storage module for storage, and conveying the rest of low-temperature hot water to a solar secondary heating submodule for further heating so as to obtain middle-temperature hot water;
s3, conveying part of the medium-temperature hot water to a medium-temperature hot water storage module for storage, conveying the rest of the medium-temperature hot water to a heat exchanger in a heat exchange subsystem, and exchanging heat with molten salt heated by a concentrating heat collector to obtain high-temperature hot water;
s4, conveying part of the high-temperature hot water to a high-temperature hot water storage module for storage, and conveying the rest of the high-temperature hot water to a steam generator for evaporation to obtain high-parameter steam;
S5, outputting part of high-parameter steam through a high-parameter steam output pipeline, conveying the rest of high-parameter steam to a back pressure steam turbine, outputting medium-parameter steam through a medium-parameter steam output pipeline by a body extraction opening of the back pressure steam turbine, outputting low-parameter steam through a low-parameter steam output pipeline by a steam turbine outlet of the back pressure steam turbine, and driving a generator to generate power while outputting the steam by the back pressure steam turbine.
In step S3, the rest of the intermediate-temperature hot water is further subjected to thermal deoxidization by a thermal deoxidizer before being conveyed to a heat exchanger in the heat exchange subsystem, and the thermal source of the thermal deoxidizer is low-parameter steam output by a turbine outlet of the back pressure turbine through a low-parameter steam output pipeline.
It should be noted that, the method for providing electric heating steam by using solar energy in a cascade manner provided in this embodiment is similar to the embodiment, and will not be described in detail herein.
The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. The solar cascade utilization electric heating steam combined supply system is characterized by comprising a first hot water supply subsystem, a heat exchange subsystem, a second hot water supply subsystem, a steam supply power generation subsystem and a photovoltaic power generation subsystem, wherein the photovoltaic power generation subsystem is respectively connected with the first hot water supply subsystem, the heat exchange subsystem, the second hot water supply subsystem and the steam supply power generation subsystem;
the first hot water supply subsystem comprises a water source supply module, a solar heat collector, a low-temperature hot water storage module and a medium-temperature hot water storage module;
The solar heat collector comprises a solar primary heating sub-module and a solar secondary heating sub-module which are connected through pipelines, wherein a water source supply module is connected with the solar primary heating sub-module through a pipeline, the solar primary heating sub-module is also connected with a low-temperature hot water storage module through a pipeline, and the solar secondary heating sub-module is also connected with a medium-temperature hot water storage module through a pipeline;
The heat exchange subsystem comprises a light condensation heat collector, a molten salt storage tank and a heat exchanger, wherein the light condensation heat collector is connected with the molten salt storage tank through a pipeline, the light condensation heat collector is also connected with a heat source end pipeline of the heat exchanger, the inlet of the heat exchange end of the heat exchanger is connected with a solar secondary heating submodule through a pipeline, the outlet of the heat exchange end of the heat exchanger is connected with a high-temperature hot water storage module pipeline in the second hot water supply subsystem, and the outlet of the heat exchange end of the heat exchanger is also connected with a steam supply power generation subsystem through a pipeline;
The steam supply power generation subsystem comprises a steam generator and a back pressure steam turbine which are connected through pipelines, and also comprises a generator connected with the back pressure steam turbine, wherein a high-parameter steam output pipeline is arranged at the joint of the steam generator and the pipeline of the back pressure steam turbine, the back pressure steam turbine is provided with a body extraction opening and a steam turbine outlet, the body extraction opening is connected with the medium-parameter steam output pipeline, and the steam turbine outlet is connected with the low-parameter steam output pipeline;
The connecting pipeline of the water source supply module and the solar primary heating sub-module is branched into an output pipeline and an input pipeline, a first valve is arranged on the output pipeline, a second valve is arranged on the input pipeline, a third valve is arranged between the output pipeline and the input pipeline at the connecting pipeline of the water source supply module and the solar primary heating sub-module, the low-temperature heat pump is respectively connected with the output pipeline and the input pipeline, and the low-temperature heat pump is also connected with the photovoltaic power generation subsystem and the generator;
The heat exchange subsystem further comprises an electrode type molten salt boiler, the electrode type molten salt boiler is connected with the molten salt storage tank through a pipeline, and the electrode type molten salt boiler is connected with the photovoltaic power generation subsystem and the generator.
2. The solar cascade utilization electric heating steam combined supply system according to claim 1, wherein the photovoltaic power generation subsystem comprises a photovoltaic power generation module, an energy storage module and a power transmission module which are sequentially connected, and the power transmission module is connected with an external power utilization module.
3. The solar cascade utilization electric heating steam combined supply system of claim 2, wherein the power transmission module is further connected with an external power taking module.
4. A solar cascade utilization electric heating steam combined supply system as claimed in claim 3, wherein the solar secondary heating sub-module is connected with a first inlet pipeline of the thermal deaerator, an outlet of the thermal deaerator is connected with a heat exchange end inlet pipeline of the heat exchanger, and a second inlet of the thermal deaerator is connected with a low-parameter steam output pipeline.
5. A solar cascade utilization electric heating steam combined supply system as claimed in claim 3, wherein the outlet of the heat exchange end of the heat exchanger is further connected with an electric steam boiler pipeline, the electric steam boiler is further connected with a high-parameter steam output pipeline, and the electric steam boiler is further connected with a photovoltaic power generation subsystem and a generator.
6. The solar cascade utilization electric heating steam combined supply system according to claim 1, wherein the low-temperature hot water storage module comprises a low-temperature heat storage water tank and a low-temperature hot water output pipeline which are connected, and a low-temperature water supply pump is arranged on the low-temperature hot water output pipeline and is connected with the photovoltaic power generation subsystem and the generator;
The medium-temperature hot water storage module comprises a medium-temperature heat storage water tank and a medium-temperature hot water output pipeline which are connected, a medium-temperature water supply pump is arranged on the medium-temperature hot water output pipeline, and the medium-temperature water supply pump is connected with the photovoltaic power generation subsystem and the power generator;
The high-temperature hot water storage module comprises a high-temperature heat storage water tank and a high-temperature hot water output pipeline which are connected, wherein a high-temperature water supply pump is arranged on the high-temperature hot water output pipeline and is connected with the photovoltaic power generation subsystem and the generator.
7. An electrothermal steam combined supply method for solar cascade utilization, based on the electrothermal steam combined supply system for solar cascade utilization of any one of claims 1-6, comprising the steps of:
s1, a water source supply module supplies water source to a solar primary heating sub-module in a solar heat collector for primary heating so as to obtain low-temperature hot water;
S2, conveying part of low-temperature hot water to a low-temperature hot water storage module for storage, and conveying the rest of low-temperature hot water to a solar secondary heating submodule for further heating so as to obtain middle-temperature hot water;
s3, conveying part of the medium-temperature hot water to a medium-temperature hot water storage module for storage, conveying the rest of the medium-temperature hot water to a heat exchanger in a heat exchange subsystem, and exchanging heat with molten salt heated by a concentrating heat collector to obtain high-temperature hot water;
s4, conveying part of the high-temperature hot water to a high-temperature hot water storage module for storage, and conveying the rest of the high-temperature hot water to a steam generator for evaporation to obtain high-parameter steam;
S5, outputting part of high-parameter steam through a high-parameter steam output pipeline, conveying the rest of high-parameter steam to a back pressure steam turbine, outputting medium-parameter steam through a medium-parameter steam output pipeline by a body extraction opening of the back pressure steam turbine, outputting low-parameter steam through a low-parameter steam output pipeline by a steam turbine outlet of the back pressure steam turbine, and driving a generator to generate power while outputting the steam by the back pressure steam turbine.
8. The method for cascade utilization of solar energy and electric heat and steam co-generation according to claim 7, wherein in step S3, the rest of the medium-temperature hot water is further subjected to thermal deoxidization by a thermal deoxidizer before being conveyed to the heat exchanger in the heat exchange subsystem, and the thermal source of the thermal deoxidizer is low-parameter steam output from the steam turbine outlet of the back pressure steam turbine through the low-parameter steam output pipeline.
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| CN110529870A (en) * | 2019-09-23 | 2019-12-03 | 高黎明 | A kind of recycling of cigarette air supply heat pump waste heat and flue gas take off the white integrated heating system heated with paddy electricity phase-change accumulation energy step |
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| CN101907075B (en) * | 2010-06-25 | 2014-04-09 | 中山大学 | Multistage coupling heat accumulating type solar heat-power cogeneration system |
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| CN110529870A (en) * | 2019-09-23 | 2019-12-03 | 高黎明 | A kind of recycling of cigarette air supply heat pump waste heat and flue gas take off the white integrated heating system heated with paddy electricity phase-change accumulation energy step |
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