CN112879114B - Thermoelectric cooperative system and method based on multi-energy complementation and step heat accumulation - Google Patents
Thermoelectric cooperative system and method based on multi-energy complementation and step heat accumulation Download PDFInfo
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- CN112879114B CN112879114B CN202110052294.2A CN202110052294A CN112879114B CN 112879114 B CN112879114 B CN 112879114B CN 202110052294 A CN202110052294 A CN 202110052294A CN 112879114 B CN112879114 B CN 112879114B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
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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
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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
Abstract
The thermoelectric cooperative system comprises a power grid, a clean energy power generation device, a water supplementing pump, a high-temperature electric heat storage steam generation system, a main steam pipeline, a branch steam pipeline, a solar heat collector, a heat storage water tank, a hot water pipeline, a hot water user and a steam user; the output end of the clean energy power generation device is respectively connected with a power grid and a high-temperature electric heat storage steam generation system, the input end of the high-temperature electric heat storage steam generation system is electrically connected with the power grid, the water supplementing pump is connected with the high-temperature electric heat storage steam generation system, the high-temperature electric heat storage steam generation system is directly connected with a steam user through a main steam pipeline, the inlet end of a branch steam pipeline is connected with the main steam pipeline, the outlet end of the branch steam pipeline is connected with the input end of a heat storage water tank, the outlet end of the solar heat collector is also connected with the input end of the heat storage water tank, the output end of the heat storage water tank is connected with a hot water user through a hot water pipeline, and complementary heat supply of the high-temperature electric heat storage steam generation system and the solar heat collector is realized.
Description
Technical Field
The application relates to the technical field, in particular to a thermoelectric cooperative system and a thermoelectric cooperative method based on multi-energy complementation and step heat accumulation.
Background
Because of the severe environmental pollution problem at present, the requirements of people on clean energy and environmental protection are more and more strict, the traditional coal-fired heating is subject to the problem of being gradually eliminated, and the development of clean heating technologies such as renewable energy sources and the like is widely focused.
Because renewable energy sources are limited by temporal discontinuities, spatial differences, and operational instabilities, renewable energy sources are often used in combination with thermal energy storage systems, and single renewable energy sources may be limited by energy shortfalls, thus the development of multi-source power generation electrical thermal storage systems is needed. Chinese patent CN210004497U proposes to use solar energy photoelectricity, geothermal energy, water source heat pump and other energy sources to form a heating system, but because the system uses water as heat storage working medium, the heat storage density is lower, and the long-time heat storage is unfavorable. Chinese patent CN210035434U proposes to use a multi-energy complementary steam system, the heat storage material uses molten salt, conduction oil, but the system supplies a relatively single product, such as only hot water, which is very uneconomical.
In the prior art, the heating systems are independently planned, independently designed and independently operated, have poor coordination among each other and have the problem of insufficient energy cascade utilization, so that a system is required to be capable of utilizing multi-source power generation and thermoelectric cooperative operation, different heat storage media can be adopted, cascade heat storage of energy is realized, and the maximum economical efficiency of energy utilization is achieved.
Disclosure of Invention
The application provides a thermoelectric cooperative system and a thermoelectric cooperative method based on multi-energy complementation and cascade heat accumulation, which are used for solving the problems that in the prior art, a heating system is independently planned, independently designed and independently operated, the coordination between the heating system and the heating system is poor, and the energy cascade utilization is insufficient.
The technical scheme adopted by the application is as follows:
a thermoelectric cooperative system based on multi-energy complementation and step heat accumulation,
the thermoelectric cooperative system comprises a power grid, a clean energy power generation device, a water supplementing pump, a high-temperature electric heat storage steam generation system, a main steam pipeline, a branch steam pipeline, a solar heat collector, a heat storage water tank, a hot water pipeline, a hot water user and a steam user;
the output end of the clean energy power generation device is respectively connected with the power grid and the high-temperature electric heat storage steam generation system and is used for generating electric energy to supply power for the power grid and the high-temperature electric heat storage steam generation system;
the input end of the high-temperature electric heat storage steam generation system is electrically connected with the power grid and is used for carrying out an electric heat storage process, converting electric energy into heat energy and storing the heat energy so as to realize complementary heat storage of the power grid and clean energy power generation;
the water supplementing pump is connected with the high-temperature electric heat storage steam generation system and is used for supplying water for the high-temperature electric heat storage steam generation system;
the high-temperature electric heat storage steam generation system is directly connected with a steam user through the main steam pipeline and is used for supplying steam for the steam user;
the inlet end of the steam branch pipeline is connected with the steam main pipeline, the outlet end of the steam branch pipeline is connected with the input end of the heat storage water tank, and the steam branch pipeline is used for conveying steam generated in the high-temperature electric heat storage steam generation system to the heat storage water tank through the steam main pipeline and the steam branch pipeline;
the outlet end of the solar heat collector is also connected with the input end of the heat storage water tank, and is used for generating hot water from tap water through solar radiation heat collection, and entering the heat storage water tank for storage;
the output end of the heat storage water tank is connected with a hot water user through the hot water pipeline and is used for supplying hot water to the hot water user through the hot water pipeline, so that complementary heat supply of the high-temperature electric heat storage steam generation system and the solar heat collector is realized.
Preferably, the clean energy power generation device comprises a wind power generation device and a photovoltaic power generation device;
the output end of the wind power generation device is respectively connected with the power grid and the high-temperature electric heat storage steam generation system;
and the output end of the photovoltaic power generation device is also respectively connected with the power grid and the high-temperature electric heat storage steam generation system.
Preferably, the water softener further comprises a softener, wherein the softener is connected with the input end of the water supplementing pump and is used for softening tap water.
A thermoelectric cooperation method based on multi-energy complementation and cascade heat accumulation, which is applied to the thermoelectric cooperation system based on multi-energy complementation and cascade heat accumulation, and comprises the following steps:
when the power grid electricity price is higher than a set maximum threshold value and the heat storage quantity of the high-temperature electric heat storage steam generation system is higher than a maximum charging threshold value, the electric energy generated by the wind power generation device and the photovoltaic power generation device is combined into the power grid for consumption, so that the load of the power grid is shared, and the complementary power supply of wind energy, solar power generation and the power grid is realized;
when the power grid electricity price is lower than a set minimum threshold value and the high-temperature electricity heat storage steam generation system is lower than a minimum charging threshold value, the electric energy generated by the clean energy power generation device is preferentially and completely transmitted to the high-temperature electricity heat storage steam generation system, the electric heat storage process is carried out to convert the electric energy into heat energy for storage until the heat energy stored by the high-temperature electricity heat storage steam generation system is higher than the maximum charging threshold value, and the residual electric energy is merged into the power grid;
if the power grid electricity price is between a set minimum threshold value and a set maximum threshold value, and the heat storage quantity of the high-temperature electric heat storage steam generation system is higher than a maximum charging threshold value, the electric energy generated by the wind power generation device and the photovoltaic power generation device is integrated into the power grid for consumption;
if the power grid electricity price is between the set minimum threshold value and the maximum threshold value, and the heat stored by the high-temperature electric heat storage steam generation system is lower than the minimum charging threshold value, the electric energy generated by the wind power generation device and the photovoltaic power generation device is transmitted to the high-temperature electric heat storage steam generation system, and the electric heat storage process is carried out to convert the electric energy into heat energy;
if the power price of the power grid is between the set minimum threshold value and the set maximum threshold value, and the heat stored by the high-temperature electric heat storage steam generation system is continuously lower than the minimum charging threshold value, the electric energy of the power grid is transmitted to the high-temperature electric heat storage steam generation system, and the electric heat storage process is carried out to convert the electric energy into heat energy for storage;
if the power grid electricity price is higher than a set maximum threshold value and the high-temperature electricity heat storage steam generation system is lower than a minimum charging threshold value, the electric energy generated by the wind power generation device and the photovoltaic power generation device is preferentially transmitted to the high-temperature electricity heat storage steam generation system, and the electric energy is converted into heat energy to be stored in an electricity heat storage process;
when a hot water user needs hot water, tap water is conveyed into a heat storage water tank through solar radiation heat collection heat in a solar heat collector, and then the tap water is supplied to the hot water user through a hot water pipeline;
or tap water is subjected to steam generation through the high-temperature electric heat storage steam generation system, enters a steam branch pipeline through a steam main pipeline, enters a heat storage water tank, is mixed with low-temperature water to obtain hot water with a certain temperature, and is supplied to a hot water user through a hot water pipeline;
when a steam user has a steam demand, the water supplementing pump is started to send water softened by the softener to the high-temperature electric heat storage steam generation system for heating, and steam generated in the high-temperature electric heat storage steam generation system is directly supplied to the steam user through the steam main pipeline.
Preferably, if the grid electricity price is higher than a set maximum threshold and the high-temperature electricity heat storage steam generation system is lower than a minimum charging threshold, the electric energy generated by the wind power generation device and the photovoltaic power generation device is preferentially transmitted to the high-temperature electricity heat storage steam generation system, and the electric heat storage process converts the electric energy into heat energy for storage, and then the method further comprises the following steps:
until the heat stored by the high-temperature electric heat storage steam generation system is higher than a specific charging threshold value, the residual electric energy is integrated into the power grid;
if the heat stored by the high-temperature electric heat storage steam generation system is continuously lower than the specific charging threshold, the electric energy of the power grid is transmitted to the high-temperature electric heat storage steam generation system to realize complementary heat storage of wind energy, solar energy power generation and the power grid;
the particular charge threshold is between a maximum charge threshold and a minimum charge threshold.
Preferably, when the hot water user has a hot water demand, the method further comprises:
the solar heat collector is preferentially used for supplying hot water, but if the heat supply of the solar heat collector cannot meet the requirements of a hot water user, a water supplementing pump is started simultaneously to send the water supply softened by the softener into a high-temperature electric heat storage steam generation system for heating, generated steam enters a steam branch pipeline through a steam main pipeline and enters a heat storage water tank to be mixed with low-temperature water to obtain hot water with a certain temperature, and the hot water is supplied to the hot water user through a hot water pipeline, so that the complementary heat supply of the high-temperature electric heat storage steam generation system and the solar heat collector is realized.
Preferably, when the user needs steam and hot water, tap water enters the solar heat collector to generate hot water through solar radiation heat collection, enters the heat storage water tank to be stored, and is supplied to the hot water user through the hot water pipeline;
simultaneously starting the water supplementing pump, and sending the water softened by the softener into the high-temperature electric heat storage steam generation system for heating;
the steam generated by the high-temperature electric heat storage steam generation system is directly supplied to a steam user through a main steam pipeline;
if the heat supply of the solar heat collector cannot meet the requirement of the hot water user on hot water, and the high-temperature electric heat storage steam generation system can meet the requirement of the steam user on steam, steam generated by the high-temperature electric heat storage steam generation system enters the steam branch pipeline through the steam main pipeline at the same time, then enters the heat storage water tank, is mixed with low-temperature water to obtain hot water with a certain temperature, and is supplied to the hot water user through the hot water pipeline, so that the cascade heat storage and heat supply of the high-temperature electric heat storage steam generation system and the solar heat collector are realized.
The technical scheme of the application has the following beneficial effects:
1. the wind power generation device and the photovoltaic power generation device can generate electric energy which can be combined into a power grid for consumption and used independently and directly for electric heat storage, so that a micro-grid with thermoelectric cooperation is formed.
2. The high-temperature electric heat storage steam generation system and the heat storage water tank form the step heat storage of energy, the high-temperature electric heat storage steam generation system can directly generate steam products, the heat storage water tank can store hot water from the solar heat collector and hot water after the steam is mixed with low-temperature water, the step heat storage and heat supply of the high-temperature electric heat storage steam generation system and the solar heat collector are realized, and the requirements of users on heat with different tastes are met.
3. The heat storage device can generate power by utilizing various clean energy sources, realize thermoelectric cooperative operation, adopt different heat storage media, realize gradient heat storage of energy and improve the energy utilization rate.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a thermoelectric synergy system based on multi-energy complementation and cascade heat storage;
FIG. 2 is a schematic diagram of a power supply system composed of the clean energy power generation device and a power grid;
illustration of:
the system comprises a 1-power grid, a 2-wind power generation device, a 3-photovoltaic power generation device, a 4-softener, a 5-water supplementing pump, a 6-high-temperature electric heat storage steam generation system, a 7-steam main pipeline, an 8-steam branch pipeline, a 9-solar heat collector, a 10-heat storage water tank, an 11-hot water pipeline, a 12-hot water user and a 13-steam user.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
Referring to fig. 1, a schematic structural diagram of a thermoelectric cooperative system based on multi-energy complementation and cascade heat accumulation is shown.
The application provides a thermoelectric cooperative system based on multi-energy complementation and step heat accumulation, which comprises a power grid 1, a clean energy power generation device, a water supplementing pump 5, a high-temperature electric heat accumulation steam generation system 6, a steam main pipeline 7, a steam branch pipeline 8, a solar heat collector 9, a heat accumulation water tank 10, a hot water pipeline 11, a hot water user 12 and a steam user 13;
the output end of the clean energy power generation device is respectively connected with the power grid 1 and the high-temperature electric heat storage steam generation system 6 and is used for generating electric energy to supply power for the power grid 1 and the high-temperature electric heat storage steam generation system 6;
the input end of the high-temperature electric heat storage steam generation system 6 is electrically connected with the power grid 1 and is used for performing an electric heat storage process, converting electric energy into heat energy and storing the heat energy, so that the power grid 1 and clean energy are used for generating and complementarily storing heat;
the water supplementing pump 5 is connected with the high-temperature electric heat storage steam generation system 6 and is used for supplying water to the high-temperature electric heat storage steam generation system 6;
the high-temperature electric heat storage steam generation system 6 is directly connected with a steam user 13 through the steam main pipeline 7 and is used for supplying steam for the steam user 13;
the inlet end of the steam branch pipeline 8 is connected with the steam main pipeline 7, the outlet end of the steam branch pipeline 8 is connected with the input end of the heat storage water tank 10, and the steam generated in the high-temperature electric heat storage steam generation system 6 is conveyed to the heat storage water tank 10 through the steam main pipeline 7 and the steam branch pipeline 8;
the outlet end of the solar heat collector 9 is also connected with the input end of the heat storage water tank 10, and is used for generating heat and heat water from tap water through solar radiation heat collection, and entering the heat storage water tank 10 for storage;
the output end of the heat storage water tank 10 is connected with a hot water user 12 through the hot water pipeline 11, and is used for supplying hot water to the hot water user 12 through the hot water pipeline 11, so that the complementary heat supply of the high-temperature electric heat storage steam generation system 6 and the solar heat collector 9 is realized.
As shown in fig. 2, the clean energy power generation device comprises a wind power generation device 2 and a photovoltaic power generation device 3;
the output end of the wind power generation device 2 is respectively connected with the power grid 1 and the high-temperature electric heat storage steam generation system 6;
the output end of the photovoltaic power generation device 3 is also respectively connected with the power grid 1 and the high-temperature electric heat storage steam generation system 6.
The water softener further comprises a softener 4, and the softener 4 is connected with the input end of the water supplementing pump 5 and is used for softening tap water.
A thermoelectric cooperation method based on multi-energy complementation and cascade heat accumulation, which is applied to the thermoelectric cooperation system based on multi-energy complementation and cascade heat accumulation, and comprises the following steps:
when the electricity price of the power grid 1 is higher than a set maximum threshold value and the heat quantity stored by the high-temperature electric heat storage steam generation system 6 is higher than a maximum charging threshold value, the electric energy generated by the wind power generation device 2 and the photovoltaic power generation device 3 is integrated into the power grid 1 for consumption and use, so that the load of the power grid 1 is shared, and the complementary power supply of wind energy, solar power generation and the power grid is realized;
when the electricity price of the power grid 1 is lower than a set minimum threshold value and the high-temperature electric heat storage steam generation system 6 is lower than a minimum charging threshold value, the electric energy generated by the clean energy power generation device is preferentially and completely transmitted to the high-temperature electric heat storage steam generation system 6, the electric heat storage process is carried out to convert the electric energy into heat energy for storage until the heat stored by the high-temperature electric heat storage steam generation system 6 is higher than the maximum charging threshold value, and the residual electric energy is integrated into the power grid 1;
if the electricity price of the power grid 1 is between the set minimum threshold value and the set maximum threshold value, and the heat stored by the high-temperature electric heat storage steam generation system 6 is higher than the maximum charging threshold value, the electric energy generated by the wind power generation device 2 and the photovoltaic power generation device 3 is integrated into the power grid 1 for consumption;
if the electricity price of the power grid 1 is between the set minimum threshold and the set maximum threshold, and the heat stored by the high-temperature electric heat storage steam generation system 6 is lower than the minimum charging threshold, the electric energy generated by the wind power generation device 2 and the photovoltaic power generation device 3 is transmitted to the high-temperature electric heat storage steam generation system 6, and the electric heat storage process is performed to convert the electric energy into heat energy;
if the electricity price of the power grid 1 is between the set minimum threshold and the maximum threshold, and the heat stored by the high-temperature electric heat storage steam generation system 6 is continuously lower than the minimum charging threshold, the electric energy of the power grid 1 is transmitted to the high-temperature electric heat storage steam generation system 6, and the electric heat storage process is carried out to convert the electric energy into heat energy for storage;
if the electricity price of the power grid 1 is higher than a set maximum threshold value and the high-temperature electricity heat storage steam generation system 6 is lower than a minimum charging threshold value, the electric energy generated by the wind power generation device 2 and the photovoltaic power generation device 3 is preferentially transmitted to the high-temperature electricity heat storage steam generation system 6, and the electric energy is converted into heat energy to be stored in an electricity heat storage process, so that the complementary heat storage of wind energy, solar power generation and the power grid is realized;
when a hot water user 12 needs hot water, tap water is conveyed into a heat storage water tank 10 in a solar heat collector 9 through solar radiation heat collection heat, and then is supplied to the hot water user 12 through a hot water pipeline 11;
or tap water is subjected to steam generation through the high-temperature electric heat storage steam generation system 6, enters a steam branch pipeline 8 through a steam main pipeline 7, enters a heat storage water tank 10, is mixed with low-temperature water to obtain hot water with a certain temperature, and is supplied to a hot water user 12 through a hot water pipeline 11;
when a steam user 13 needs steam, the water supplementing pump 5 is started to send water softened by the softener 4 to the high-temperature electric heat storage steam generation system 6 for heating, and steam generated in the high-temperature electric heat storage steam generation system 6 is directly supplied to the steam user 13 through the main steam pipeline 7.
If the electricity price of the power grid 1 is higher than the set maximum threshold value and the high-temperature electric heat storage steam generation system 6 is lower than the minimum charging threshold value, the electric energy generated by the wind power generation device 2 and the photovoltaic power generation device 3 is preferentially transmitted to the high-temperature electric heat storage steam generation system 6, and the electric heat storage process converts the electric energy into heat energy for storage, and then the method further comprises the following steps:
until the heat stored by the high-temperature electric heat storage steam generation system 6 is higher than a specific charging threshold value, the residual electric energy is incorporated into the power grid 1;
if the heat stored by the high-temperature electric heat storage steam generation system 6 is continuously lower than the specific charging threshold, the electric energy of the power grid 1 is transmitted to the high-temperature electric heat storage steam generation system 6 to realize complementary heat storage of wind energy, solar energy power generation and the power grid;
the particular charge threshold is between a maximum charge threshold and a minimum charge threshold.
The method further comprises, when the hot water user 12 has a hot water demand:
the solar heat collector 9 is preferably used for supplying hot water, but if the heat supply of the solar heat collector 9 cannot meet the requirement of the hot water user 12, the water supplementing pump 5 is started simultaneously to send the water softened by the softener 4 into the high-temperature electric heat storage steam generation system 6 for heating, the generated steam enters the steam branch pipeline 8 through the steam main pipeline 7, enters the heat storage water tank 10 and low-temperature water for mixing to obtain hot water with a certain temperature, and is supplied to the hot water user 12 through the hot water pipeline 11, so that the complementary heat supply of the high-temperature electric heat storage steam generation system 6 and the solar heat collector 9 is realized.
When the heat stored by the high-temperature electric heat storage steam generation system 6 is between the minimum charging threshold and the maximum charging threshold, the high-temperature electric heat storage steam generation system 6 can enter a heat storage and release state, and can supply steam and hot water at the same time and can be used in cooperation with the solar heat collector 9.
When the user needs steam and hot water, tap water enters the solar heat collector 9 to generate hot water through solar radiation heat collection, enters the heat storage water tank 10 to be stored, and is supplied to the hot water user 12 through the hot water pipeline 11;
simultaneously starting the water supplementing pump 5, and sending the water softened by the softener 4 into the high-temperature electric heat storage steam generation system 6 for heating;
the steam generated by the high-temperature electric heat storage steam generation system 6 is directly supplied to a steam user 13 by a main steam pipeline 7;
if the heat supply of the solar heat collector 9 cannot meet the requirement of the hot water user 12 on hot water, and the high-temperature electric heat storage steam generation system 6 can meet the requirement of the steam user 13 on steam, the steam generated by the high-temperature electric heat storage steam generation system 6 enters the steam branch pipeline 8 through the steam main pipeline 7, then enters the heat storage water tank 10, is mixed with low-temperature water to obtain hot water with a certain temperature, and is supplied to the hot water user 12 through the hot water pipeline 11, so that the cascade heat storage and heat supply of the high-temperature electric heat storage steam generation system 6 and the solar heat collector 9 are realized, and the requirements of users on different tastes and heat are met.
The set thresholds can be adjusted according to the local actual running condition, and the economic benefit and the energy utilization rate of the micro-grid thermoelectric cooperation are considered.
The heat storage device can generate power by utilizing various clean energy sources, realize thermoelectric cooperative operation, adopt different heat storage media, realize gradient heat storage of energy and improve the energy utilization rate.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (5)
1. A thermoelectric cooperative system based on multi-energy complementation and step heat accumulation is characterized in that,
the thermoelectric cooperative system comprises a power grid (1), a clean energy power generation device, a water supplementing pump (5), a high-temperature electric heat storage steam generation system (6), a steam main pipeline (7), a steam branch pipeline (8), a solar heat collector (9), a heat storage water tank (10), a hot water pipeline (11), a hot water user (12), a steam user (13) and a softener (4);
the output end of the clean energy power generation device is respectively connected with the power grid (1) and the high-temperature electric heat storage steam generation system (6) and is used for generating electric energy to supply power for the power grid (1) and the high-temperature electric heat storage steam generation system (6), and the clean energy power generation device comprises a wind power generation device (2) and a photovoltaic power generation device (3);
the output end of the wind power generation device (2) is respectively connected with the power grid (1) and the high-temperature electric heat storage steam generation system (6);
the output end of the photovoltaic power generation device (3) is also respectively connected with the power grid (1) and the high-temperature electric heat storage steam generation system (6);
the input end of the high-temperature electric heat storage steam generation system (6) is electrically connected with the power grid (1) and is used for carrying out an electric heat storage process, converting electric energy into heat energy and storing the heat energy, so that the power grid (1) and clean energy power generation complementary heat storage is realized;
the water supplementing pump (5) is connected with the high-temperature electric heat storage steam generation system (6) and is used for supplying water to the high-temperature electric heat storage steam generation system (6);
the high-temperature electric heat storage steam generation system (6) is directly connected with a steam user (13) through the main steam pipeline (7) and is used for supplying steam for the steam user (13);
the inlet end of the steam branch pipeline (8) is connected with the steam main pipeline (7), the outlet end of the steam branch pipeline is connected with the input end of the heat storage water tank (10) and is used for conveying steam generated in the high-temperature electric heat storage steam generation system (6) to the heat storage water tank (10) through the steam main pipeline (7) and the steam branch pipeline (8);
the outlet end of the solar heat collector (9) is also connected with the input end of the heat storage water tank (10) and is used for collecting tap water through solar radiation to generate hot water, and the hot water enters the heat storage water tank (10) for storage;
the output end of the heat storage water tank (10) is connected with a hot water user (12) through the hot water pipeline (11) and is used for supplying hot water to the hot water user (12) through the hot water pipeline (11), so that the complementary heat supply of the high-temperature electric heat storage steam generation system (6) and the solar heat collector (9) is realized;
the softener (4) is connected with the input end of the water supplementing pump (5) and is used for softening tap water;
when the electricity price of the power grid (1) is higher than a set maximum threshold value and the heat storage quantity of the high-temperature electric heat storage steam generation system (6) is higher than a maximum charging threshold value, the electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is combined into the power grid (1) for consumption, the load of the power grid (1) is shared, and the complementary power supply of wind energy, solar power generation and the power grid is realized;
when the electricity price of the power grid (1) is lower than a set minimum threshold value and the high-temperature electric heat storage steam generation system (6) is lower than a minimum charging threshold value, the electric energy generated by the clean energy power generation device is preferentially and completely transmitted to the high-temperature electric heat storage steam generation system (6), the electric heat storage process is carried out to convert the electric energy into heat energy for storage until the heat storage quantity stored by the high-temperature electric heat storage steam generation system (6) is higher than the maximum charging threshold value, and the residual electric energy is integrated into the power grid (1);
if the electricity price of the power grid (1) is between a set minimum threshold value and a set maximum threshold value, and the heat storage quantity of the high-temperature electric heat storage steam generation system (6) is higher than the maximum charging threshold value, the electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is integrated into the power grid (1) for consumption;
if the electricity price of the power grid (1) is between a set minimum threshold value and a set maximum threshold value, and the heat stored by the high-temperature electric heat storage steam generation system (6) is lower than a minimum charging threshold value, electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is transmitted to the high-temperature electric heat storage steam generation system (6), and the electric heat storage process is carried out to convert the electric energy into heat energy;
if the electricity price of the power grid (1) is between a set minimum threshold value and a set maximum threshold value, and the heat stored by the high-temperature electric heat storage steam generation system (6) is continuously lower than a minimum charging threshold value, the electric energy of the power grid (1) is transmitted to the high-temperature electric heat storage steam generation system (6) to be converted into heat energy for storage in an electric heat storage process;
if the electricity price of the power grid (1) is higher than a set maximum threshold value and the high-temperature electric heat storage steam generation system (6) is lower than a minimum charging threshold value, the electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is preferentially transmitted to the high-temperature electric heat storage steam generation system (6), and the electric heat storage process is carried out to convert the electric energy into heat energy for storage;
when a hot water user (12) needs hot water, tap water is conveyed into a heat storage water tank (10) in a solar heat collector (9) through solar radiation heat collection heat, and then the tap water is supplied to the hot water user (12) through a hot water pipeline (11);
or tap water is subjected to steam generation through the high-temperature electric heat storage steam generation system (6), enters a steam branch pipeline (8) through a steam main pipeline (7), enters a heat storage water tank (10), is mixed with low-temperature water to obtain hot water with a certain temperature, and is supplied to a hot water user (12) through a hot water pipeline (11);
when a steam user (13) has a steam demand, the water supplementing pump (5) is started to send water after softening treatment by the softener (4) to the high-temperature electric heat storage steam generation system (6) for heating, and steam generated in the high-temperature electric heat storage steam generation system (6) is directly supplied to the steam user (13) through the steam main pipeline (7).
2. A thermoelectric synergy method based on multi-energy complementation and cascade heat storage, which is characterized by being applied to the thermoelectric synergy system based on multi-energy complementation and cascade heat storage as claimed in claim 1, wherein the thermoelectric synergy method comprises the following steps:
when the electricity price of the power grid (1) is higher than a set maximum threshold value and the heat storage quantity of the high-temperature electric heat storage steam generation system (6) is higher than a maximum charging threshold value, the electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is combined into the power grid (1) for consumption, the load of the power grid (1) is shared, and the complementary power supply of wind energy, solar power generation and the power grid is realized;
when the electricity price of the power grid (1) is lower than a set minimum threshold value and the high-temperature electric heat storage steam generation system (6) is lower than a minimum charging threshold value, the electric energy generated by the clean energy power generation device is preferentially and completely transmitted to the high-temperature electric heat storage steam generation system (6), the electric heat storage process is carried out to convert the electric energy into heat energy for storage until the heat storage quantity stored by the high-temperature electric heat storage steam generation system (6) is higher than the maximum charging threshold value, and the residual electric energy is integrated into the power grid (1);
if the electricity price of the power grid (1) is between a set minimum threshold value and a set maximum threshold value, and the heat storage quantity of the high-temperature electric heat storage steam generation system (6) is higher than the maximum charging threshold value, the electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is integrated into the power grid (1) for consumption;
if the electricity price of the power grid (1) is between a set minimum threshold value and a set maximum threshold value, and the heat stored by the high-temperature electric heat storage steam generation system (6) is lower than a minimum charging threshold value, electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is transmitted to the high-temperature electric heat storage steam generation system (6), and the electric heat storage process is carried out to convert the electric energy into heat energy;
if the electricity price of the power grid (1) is between a set minimum threshold value and a set maximum threshold value, and the heat stored by the high-temperature electric heat storage steam generation system (6) is continuously lower than a minimum charging threshold value, the electric energy of the power grid (1) is transmitted to the high-temperature electric heat storage steam generation system (6) to be converted into heat energy for storage in an electric heat storage process;
if the electricity price of the power grid (1) is higher than a set maximum threshold value and the high-temperature electric heat storage steam generation system (6) is lower than a minimum charging threshold value, the electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is preferentially transmitted to the high-temperature electric heat storage steam generation system (6), and the electric heat storage process is carried out to convert the electric energy into heat energy for storage;
when a hot water user (12) needs hot water, tap water is conveyed into a heat storage water tank (10) in a solar heat collector (9) through solar radiation heat collection heat, and then the tap water is supplied to the hot water user (12) through a hot water pipeline (11);
or tap water is subjected to steam generation through the high-temperature electric heat storage steam generation system (6), enters a steam branch pipeline (8) through a steam main pipeline (7), enters a heat storage water tank (10), is mixed with low-temperature water to obtain hot water with a certain temperature, and is supplied to a hot water user (12) through a hot water pipeline (11);
when a steam user (13) has a steam demand, the water supplementing pump (5) is started to send water after softening treatment by the softener (4) to the high-temperature electric heat storage steam generation system (6) for heating, and steam generated in the high-temperature electric heat storage steam generation system (6) is directly supplied to the steam user (13) through the steam main pipeline (7).
3. A thermoelectric synergy method based on multi-energy complementation and cascade heat accumulation according to claim 2, wherein,
if the electricity price of the power grid (1) is higher than a set maximum threshold value and the high-temperature electric heat storage steam generation system (6) is lower than a minimum charging threshold value, the electric energy generated by the wind power generation device (2) and the photovoltaic power generation device (3) is preferentially transmitted to the high-temperature electric heat storage steam generation system (6), the electric heat storage process is carried out to convert the electric energy into heat energy for storage, and then the method further comprises the following steps:
until the heat stored by the high-temperature electric heat storage steam generation system (6) is higher than a specific charging threshold value, the residual electric energy is integrated into the power grid (1);
if the heat stored by the high-temperature electric heat storage steam generation system (6) is continuously lower than the specific charging threshold, the electric energy of the power grid (1) is transmitted to the high-temperature electric heat storage steam generation system (6) to realize complementary heat storage of wind energy, solar energy power generation and the power grid;
the particular charge threshold is between a maximum charge threshold and a minimum charge threshold.
4. A synergistic method of thermoelectric based on multi-energy complementation and cascade heat accumulation according to claim 2, characterized in that said when hot water user (12) has a hot water demand further comprises:
the solar heat collector (9) is preferentially used for supplying hot water, but if the heat supply of the solar heat collector (9) cannot meet the requirement of a hot water user (12), the water supply pump (5) is started to send the water softened by the softener (4) into the high-temperature electric heat storage steam generation system (6) for heating, generated steam enters the steam branch pipeline (8) through the steam main pipeline (7) and enters the heat storage water tank (10) to be mixed with low-temperature water to obtain hot water with a certain temperature, and the hot water is supplied to the hot water user (12) through the hot water pipeline (11), so that the complementary heat supply of the high-temperature electric heat storage steam generation system (6) and the solar heat collector (9) is realized.
5. A thermoelectric synergy method based on multi-energy complementation and cascade heat accumulation according to claim 2, wherein,
when the user needs steam and hot water, tap water enters the solar heat collector (9) to collect heat to generate hot water through solar radiation, enters the heat storage water tank (10) to store, and is supplied to the hot water user (12) through the hot water pipeline (11);
simultaneously starting the water supplementing pump (5) and sending the water softened by the softener (4) to the high-temperature electric heat storage steam generation system (6) for heating;
the steam generated by the high-temperature electric heat storage steam generation system (6) is directly supplied to a steam user (13) through a main steam pipeline (7);
if the heat supply of the solar heat collector (9) can not meet the requirement of the hot water user (12) on the hot water, and when the high-temperature electric heat storage steam generation system (6) can meet the requirement of the steam user (13) on the steam, the steam generated by the high-temperature electric heat storage steam generation system (6) enters the steam branch pipeline (8) through the steam main pipeline (7) at the same time, then enters the heat storage water tank (10) to be mixed with low-temperature water to obtain hot water with a certain temperature, and then is supplied to the hot water user (12) through the hot water pipeline (11), so that the step heat storage and heat supply of the high-temperature electric heat storage steam generation system (6) and the solar heat collector (9) are realized.
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