CN114439560B - Thermoelectric compressed air energy storage system and method adopting thermoelectric unit for extracting steam and storing heat - Google Patents
Thermoelectric compressed air energy storage system and method adopting thermoelectric unit for extracting steam and storing heat Download PDFInfo
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- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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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
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
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- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
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- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
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- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/70—Wind energy
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention discloses a thermoelectric compressed air energy storage system and method adopting a thermoelectric unit to extract steam and store heat. The system is coupled with the combined heat and power unit and the wind turbine, so that the combined heat and power unit can be subjected to thermoelectric decoupling, the wind power fluctuation can be effectively stabilized, and the energy grade can be matched on a macroscopic level to improve the efficiency. The invention has important scientific significance and practical value in the aspects of novel power system construction, double-carbon target realization and the like.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of energy, and particularly relates to a thermoelectric compressed air energy storage system and method adopting a thermoelectric unit to extract steam and store heat.
Background
In recent years, the development of wind power generation technology is rapid, and the wind power generation technology becomes the renewable energy utilization mode which is the fastest to grow in the world, however, the wind power has the characteristics of intermittence, volatility, reverse peak regulation and the like, and the large-scale grid connection of the wind power generation technology causes serious impact on a power system; in addition, the spatial distribution difference exists between the wind power production and the load demand, which causes the difficulty in power delivery and the limited local absorption capacity, so that the phenomena of wind abandoning and power limiting exist universally in a large range, and the support technology for large-scale wind power energy absorption is not easy to find.
In the prior art, wind power consumption is assisted mainly through two modes, firstly, wind power fluctuation is stabilized by means of an energy storage system, and uncertainty of energy flow of the wind power fluctuation is reduced so as to realize wind power controllability and adjustability. And the other method is to improve the deep peak regulation capability of the thermal power generating units through the improvement of the operation flexibility of the thermal power generating units in the power grid, and provide space for the fluctuation wind power grid connection as much as possible.
The compressed air energy storage belongs to one of hot point application technologies of future large-scale energy storage due to good technical performance, and various implementation forms are derived, such as afterburning type compressed air energy storage, adiabatic compressed air energy storage, liquefied air energy storage, supercritical compressed air energy storage, isothermal compressed air energy storage and the like. However, for the characteristics of large-scale development of wind power in China, if the configured compressed air energy storage system needs to increase the energy storage and release capacity/power level, the compressed air energy storage system is usually realized by means of increasing the air storage pressure or increasing the air storage volume. However, the technology generally needs a suitable large underground cave to store high-pressure air, the construction and popularization of the technology are restricted by geological conditions, and the increase of the air storage volume is difficult to realize. Meanwhile, increasing the gas storage pressure also brings difficulties to the design and manufacture of rotating machines such as gas compressors and turbines. Under the condition, the thermoelectric compressed air energy storage system can be formed by introducing the electric heating unit on the basis of adiabatic compressed air energy storage, so that the capacity/power grade of the energy storage system can be effectively improved, and the limitation of geological structural conditions and the design and manufacturing level of the rotary machine on the energy storage system is reduced. The thermoelectric compressed air energy storage technology has strong heat storage capacity, can simultaneously store electric energy in the forms of air pressure energy and joule heat, has huge cleaning and heat supply potential, but the application of the aspect is not effectively developed, and moreover, the high-temperature turbine exhaust in the energy release stage is directly emptied, so that the waste heat resources are not fully utilized, and the comprehensive energy utilization efficiency is limited.
In the aspect of improving the operation flexibility of the thermal power generating unit, the conventional condensation type thermal power generating unit is improved and transformed through technology, deep peak regulation is easy to realize, but the strong heat-electricity coupling relation of the thermal power generating unit is caused by the 'fixed power by heat' operation mode of the thermal power generating unit in the heating season, so that the unit cannot participate in effective peak regulation, the operation flexibility is reduced, and the online space which can be provided for wind power originally is occupied. In order to solve the problem, in the prior art, surplus electric energy or surplus waste heat energy under strong heat-electricity coupling is directly or indirectly stored and converted to realize thermoelectric decoupling to a certain degree, and common technologies comprise steam heat storage heat supply, electrode boiler heat supply, electric drive heat pump heat supply, low-pressure cylinder zero-output heat supply, high-medium pressure cylinder bypass heat supply and the like. However, from a macroscopic level or a system level, the technologies are reconstruction measures for the cogeneration unit, and lack of coupling with an energy storage system which is important in a future novel power system, so that formulation of an optimal energy regulation and control strategy of the novel power system is influenced, and the overall energy utilization efficiency is influenced.
In conclusion, the wind power base is far away from the load center, and the intermittent, fluctuating and peak-reverse regulation characteristics of the wind power enable the phenomena of 'wind abandon and power limitation' to be ubiquitous. At the present stage, the auxiliary power supply system can provide assistance for wind power integration by arranging energy storage systems such as compressed air energy storage and the like and improving the operation flexibility and the deep peak regulation capability of the combined heat and power supply unit. On one hand, for the geological condition of a specific gas storage volume, the thermoelectric compressed air energy storage system with the electric heating unit can effectively improve the energy storage capacity/power level, and reduce the limitation of the geological structure condition and the design and manufacture level of the rotating machinery on the system, but the strong heat storage capacity of the system is not exerted in the aspect of heating, and the waste heat of the high-temperature turbine exhaust gas in the energy release stage is not utilized. On the other hand, from the system level, the existing thermoelectric cogeneration unit thermoelectric decoupling technology is only the improvement of the unit, lacks the coupling with an important energy storage system in a novel power system, and restricts the overall performance improvement of the power system.
Disclosure of Invention
The invention aims to provide a thermoelectric compressed air energy storage system and a method adopting steam extraction and heat storage of a thermoelectric unit, which are used for solving the problems of difficult grid connection and serious wind and electricity abandonment limit phenomena of the existing wind power.
In order to achieve the purpose, the invention adopts the following technical scheme:
the thermoelectric compressed air energy storage system comprises an adiabatic compressed air energy storage module, an electric/thermal heat storage module, a heat supply module and a power supply module, wherein the adiabatic compressed air energy storage module and the electric/thermal heat storage module jointly form the thermoelectric compressed air energy storage system;
the adiabatic compressed air energy storage module comprises a motor, wherein an energy storage module and an energy release module are respectively connected to two sides of the motor, the tail end of the energy release module is connected to a heat supply module, when the energy storage module runs, the motor runs in a motor mode, and when the energy release module runs, the motor runs in a generator mode;
the electric/thermal heat storage module comprises a cold-state liquid storage tank, an electric heat storage loop and a thermal heat storage loop are connected between an outlet and an inlet of the cold-state liquid storage tank, the electric heat storage loop comprises an electric heater and a high-temperature liquid storage tank which are sequentially connected, the energy storage module exchanges heat with the head end of the electric heat storage loop through an intercooler, and the energy release module exchanges heat with the tail end of the electric heat storage loop through a reheater; the heat storage loop comprises an auxiliary electric heater connected to the outlet of the cold-state liquid storage tank, the outlet end of the auxiliary electric heater is connected to the medium-temperature liquid storage tank, the outlet end of the medium-temperature liquid storage tank is divided into two paths, one path is connected to the inlet end of the electric heater, the other path is connected to the inlet of the cold-state liquid storage tank after heat exchange of the heat supply module, and the inlet end of the auxiliary electric heater is also connected to the medium-temperature liquid storage tank through a steam extraction heat exchanger;
the heat supply module comprises a main heat exchange station, an auxiliary heat exchange station and an exhaust heat supplier, the tail end of the energy release module is connected to the exhaust heat supplier, and the auxiliary heat exchange station is used for connecting with the other path of the outlet end of the medium-temperature liquid storage tank for heat exchange;
the power supply module comprises a conventional condensing unit, a wind turbine generator, a combined heat and power supply unit and an intelligent scheduling control system, wherein the conventional condensing unit, the wind turbine generator and the combined heat and power supply unit supply power to users, an electric heater, an auxiliary electric heater and a motor through the intelligent scheduling control system; the steam extraction outlet of the cogeneration unit is connected to the steam extraction heat exchanger, the extracted steam returns to the cogeneration unit through the steam extraction inlet connected to the cogeneration unit after releasing heat in the steam extraction heat exchanger, the main heat exchange station is connected between the steam extraction inlet and the steam extraction outlet of the cogeneration unit, the outlet end of the auxiliary heat exchange station, the outlet end of the main heat exchange station and the outlet end of the exhaust heat supply device are connected to user heat supply water, and the user heat supply return water is respectively connected to the inlet end of the auxiliary heat exchange station, the inlet end of the main heat exchange station and the inlet end of the exhaust heat supply device.
Further, the energy storage module comprises a low-pressure compressor and a high-pressure compressor, the low-pressure compressor and the high-pressure compressor are coaxially arranged, a pipeline between a gas outlet of the low-pressure compressor and a gas inlet of the high-pressure compressor is connected with an intercooler, the high-pressure compressor is connected with the motor through a first clutch, a gas outlet of the high-pressure compressor is connected to the gas storage volume through a solid heat accumulator, and a first valve is arranged between the solid heat accumulator and the gas storage volume.
Further, the energy releasing module comprises a high-pressure turbine and a low-pressure turbine, the high-pressure turbine and the low-pressure turbine are coaxially arranged, the high-pressure turbine is connected with the motor through a second clutch, the outlet end of the gas storage volume is connected to the gas inlet of the high-pressure turbine through a solid heat accumulator, a second valve is arranged between the gas storage volume and the solid heat accumulator, a pipeline between the gas outlet of the high-pressure turbine and the gas inlet of the low-pressure turbine is connected with a reheater, and the outlet end of the low-pressure turbine is connected to an exhaust heat supply device.
Furthermore, a first three-way valve is arranged at the outlet end of the cold state liquid storage tank, a first port of the first three-way valve is connected with the outlet end of the cold state liquid storage tank, a second port of the first three-way valve is connected with the inlet end of the intercooler, and a third port of the first three-way valve is connected with a seventh three-way valve;
and a first port of the seventh three-way valve is connected with a third port of the first three-way valve, a second port of the seventh three-way valve is connected to the inlet end of the auxiliary electric heater, and a third port of the seventh three-way valve is connected to the inlet end of the steam extraction heat exchanger.
Furthermore, a second three-way valve is arranged between the outlet end of the intercooler and the inlet end of the electric heater, a first port of the second three-way valve is connected with the outlet end of the intercooler, and a second port of the second three-way valve is connected with the inlet end of the electric heater;
and a fourth three-way valve is arranged at the outlet end of the medium-temperature liquid storage tank, a first port of the fourth three-way valve is connected with the outlet end of the medium-temperature liquid storage tank, a second port of the fourth three-way valve is connected to the inlet end of the auxiliary heat exchange station, and a third port of the fourth three-way valve is connected with a third port of the second three-way valve.
Furthermore, the inlet end of the cold-state liquid storage tank is provided with a third three-way valve, a first port of the third three-way valve is connected with the inlet end of the cold-state liquid storage tank, a second port of the third three-way valve is connected with the outlet end of the reheater, and a third port of the third three-way valve is connected with the outlet end of the secondary heat exchange station.
Furthermore, a fifth three-way valve is arranged between the steam extraction outlet of the cogeneration unit and the inlet end of the steam extraction heat exchanger, a first port of the fifth three-way valve is connected with the steam extraction outlet of the cogeneration unit, a second port of the fifth three-way valve is connected with the inlet end of the steam extraction heat exchanger, and a third port of the fifth three-way valve is connected with the steam inlet of the main heat exchange station;
and a sixth three-way valve is arranged between the outlet end of the steam extraction heat exchanger and the steam extraction inlet of the cogeneration unit, a first port of the sixth three-way valve is connected with the outlet end of the steam extraction heat exchanger, a second port of the sixth three-way valve is connected with the steam extraction inlet of the cogeneration unit, and a third port of the sixth three-way valve is connected with the steam outlet of the main heat exchange station.
Furthermore, a heat supply and water supply outlet of the main heat exchange station is provided with a first four-way valve, a first port of the first four-way valve is connected with the heat supply and water supply outlet of the main heat exchange station, a second port of the first four-way valve is connected with the heat supply and water supply outlet of the auxiliary heat exchange station, a third port of the first four-way valve is connected with the heat supply and water supply outlet of the exhaust heat supply device, and a fourth port of the first four-way valve is connected with heat supply and water supply of a user.
Furthermore, a heat supply backwater inlet of the main heat exchange station is provided with a second four-way valve, a first port of the second four-way valve is connected with the heat supply backwater inlet of the main heat exchange station, a second port of the second four-way valve is connected with a heat supply backwater inlet of the auxiliary heat exchange station, a third port of the second four-way valve is connected with a heat supply backwater inlet of the exhaust heat supplier, and a fourth port of the second four-way valve is connected with heat supply backwater of a user.
The thermoelectric type compressed air energy storage method adopting the steam extraction and heat storage of the thermoelectric unit comprises a heating season and daytime mode and a heating season and night mode;
when the system is in a heating season daytime mode, the electric load demand is high, the shortage of power supply still exists after all the power generation power of a conventional condensing unit, a wind turbine generator and a combined heat and power unit is distributed to an end user through an intelligent scheduling control system, at the moment, the thermoelectric compressed air energy storage system works in an energy release mode, an energy release module exhausts air, enters an exhaust heat supply device to release heat and then is exhausted to the atmosphere, meanwhile, in an electric heat storage loop of an electric/heat storage module, a high-temperature heat storage medium in a high-temperature liquid storage tank flows out, enters a reheater to release heat and then is stored in a cold-state liquid storage tank;
on the other hand, the heat load demand in the heating seasons and the daytime is low, the intelligent scheduling control system preferentially uses the energy release module to exhaust for heat supply, at the moment, in the exhaust heat supply device, one strand of heat supply backwater enters the exhaust heat supply device to absorb the exhaust waste heat of the energy release module, and is merged into the total heat supply water supply loop to provide partial heat supply after being heated, so that the energy gradient utilization is realized; the rest of heat supply is satisfied by a cogeneration unit with higher output level, at the moment, heat supply extraction steam of the cogeneration unit flows into a main heat exchange station to release heat, the extracted steam after cooling returns to the cogeneration unit, meanwhile, the other heat supply return water enters the main heat exchange station to absorb the heat released by the extraction steam, the heat is concentrated into a main heat supply water supply loop to provide the rest of heat supply after being heated, the redundant extraction steam of the cogeneration unit flows into an extraction steam heat exchanger to release heat, the cooled extraction steam returns to the cogeneration unit, meanwhile, a cold-state heat storage medium of a cold-state liquid storage tank enters the extraction steam heat exchanger, the temperature is raised to be changed into a medium-temperature heat storage medium after absorbing the heat released by the extraction steam, and the medium-temperature heat storage tank is stored;
when the system is in a night mode of a heating season, the electric load demand is low, the generated power of a conventional condensing unit, a wind turbine generator unit and a combined heat and power unit still has surplus electric power after being supplied to a terminal user through an intelligent scheduling control system, at the moment, the thermoelectric compressed air energy storage system works in an energy storage mode, the intelligent scheduling control system distributes the surplus electric power to electric heat storage loops of an adiabatic compressed air energy storage module and an electric/thermal heat storage module respectively according to a reasonable electric power distribution ratio, for the adiabatic compressed air energy storage module, the motor operates in the energy storage mode and performs air compression by using the distributed electric power to realize compressed heat storage, for the electric heat storage loop of the electric/thermal heat storage module, a cold-state heat storage medium in a cold state enters an intercooler, absorbs heat in the compression process of the energy storage module to raise the temperature, then enters an electric heater to continue to heat by using the distributed other strand of electric power, and a high-temperature heat storage medium is generated after the temperature is raised and stored in a high-temperature liquid storage tank;
on the other hand, the heat load demand is high in the night of a heating season, the intelligent scheduling control system firstly schedules the cogeneration unit to supply heat, heat supply extraction steam of the cogeneration unit flows into the main heat exchange station to release heat, cooled extraction steam flows back to the cogeneration unit, meanwhile, one heat supply backwater flows into the main heat exchange station to absorb the extraction steam to release heat, the heat supply backwater is converged into the main heat exchange station to provide part of heat supply after being heated, meanwhile, a medium-temperature heat storage medium stored in a liquid storage tank of a heat storage loop of the electricity/heat storage module flows out, the medium-temperature heat storage medium enters the auxiliary heat exchange station to release heat, the cooled heat supply backwater is stored in a cold-state liquid storage tank, at the moment, the other heat supply backwater flows into the auxiliary heat exchange station, and the heat supply backwater is converged into the main heat supply water loop to provide the rest of heat supply after absorbing and heating;
in addition, if the heat storage quantity of the heat storage loop of the daytime electric/heat storage module exceeds the heat supply requirement, the medium-temperature heat storage medium in the medium-temperature liquid storage tank enters the electric heater, the electric energy distributed to the electric heat storage loop is used for continuing heating, the medium-temperature heat storage medium is heated to become the high-temperature heat storage medium and then stored in the high-temperature liquid storage tank, and in addition, if the heat storage quantity of the heat storage loop of the daytime electric/heat storage module cannot meet the heat supply requirement, the cold-state heat storage medium in the cold-state liquid storage tank flows out and enters the auxiliary electric heater, the electric energy distributed to the electric heat storage loop is used for continuing heating, and the generated medium-temperature heat storage medium is stored in the medium-temperature liquid storage tank so as to make up the heat supply power gap.
Compared with the prior art, the invention has the following beneficial technical effects:
the thermoelectric compressed air energy storage system is formed by introducing an electric heating loop and a steam heating loop on the basis of adiabatic compressed air energy storage. As a core node of a future novel power system, the system can be deeply coupled with a cogeneration unit, a wind turbine generator and the like in the power system, and not only can store the multi-waste heat power of the cogeneration unit in the heating season in a steam extraction and heat storage manner, but also can realize the thermoelectric decoupling of the cogeneration unit; and the effective stabilization of wind power fluctuation can be realized to improve the grid-connected level of the wind power fluctuation and reduce the wind abandon rate. Meanwhile, the energy quality and the taste can be matched from a macro level, an optimal energy regulation and control strategy of the coupling system is formulated, and the energy utilization efficiency is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of a thermoelectric compressed air energy storage system using a thermoelectric unit to extract steam and store heat according to the present invention.
Wherein, 1, a low-pressure compressor; 2. an intercooler; 3. a high pressure compressor; 4. a solid heat accumulator; 5. a first valve; 6. a gas storage volume; 7. a second valve; 8. a high pressure turbine; 9. a reheater; 10. a low pressure turbine; 11. a first clutch; 12. a second clutch; 13. a motor; a1, a conventional condensing unit; a2, a wind turbine generator set; a3, a combined heat and power unit; a4, an intelligent scheduling control system; b1, a cold-state liquid storage tank; b2, a first three-way valve; b3, a second three-way valve; b4, an electric heater; b5, a high-temperature liquid storage tank; b6, a third three-way valve; b7, extracting steam and exchanging heat; b8, a medium-temperature liquid storage tank; b9, a fourth three-way valve; b10, a seventh three-way valve; b11, an auxiliary electric heater; c1, a main heat exchange station; c2, an auxiliary heat exchange station; c3, an exhaust heat supply device; c4, a fifth three-way valve; c5, a sixth three-way valve; c6, a first four-way valve; c7, a second four-way valve.
Detailed Description
The embodiments of the invention are described in detail below with reference to the drawings:
when the thermoelectric compressed air energy storage system runs, the thermoelectric compressed air energy storage system is coupled with energy sources such as a conventional condensing unit A1, a combined heat and power unit A3 and an air generating unit A2, and continuous and reliable combined heat and power is realized under the coordination of an intelligent dispatching control system A4. The thermoelectric compressed air energy storage system is used as an energy buffer module to store and release electric energy and heat energy. According to the characteristics of the energy source and the load, the system can be divided into the following operation modes:
during the heating season, the electrical load demand is high and the thermal load demand is low, and the wind power is low due to the reverse peak regulation characteristic of the wind power. In order to meet the requirement of higher electric load, except that the conventional condensing unit A1 and the wind turbine A2 are all used for supplying power, the intelligent dispatching control system A4 not only requires that the combined heat and power unit has higher output, but also requires that the thermoelectric compressed air energy storage system operates in an energy release mode. At the moment, the high-pressure air stored in the thermoelectric compressed air energy storage system and the high-temperature heat storage medium of the electric heat storage loop act together, and the two stages of turbines are used for driving the generator to generate electricity so as to make up for the electric energy gap. In addition, in the aspect of heat supply, because the turbine exhaust temperature of the thermoelectric compressed air energy storage system in the energy release stage is higher, the intelligent scheduling control system A4 preferentially uses the turbine exhaust to supply heat, the energy gradient utilization is realized to improve the energy conversion efficiency of the system, and the insufficient heat supply part is supplemented by the combined heat and power unit A3. However, because the output of the cogeneration unit A3 is high, the cogeneration unit still has a large amount of waste heat power after meeting the heat supply requirement, and at the moment, the waste heat power can be stored in a heat storage loop of the thermoelectric compressed air energy storage system in a steam extraction and heat storage manner. In summary, the thermoelectric compressed air energy storage system operates in an energy release-steam extraction and heat storage mode, power is supplied by a conventional condensing unit, a combined heat and power supply unit, a wind turbine unit and the thermoelectric compressed air energy storage system, heat is supplied by a combined heat and power supply unit (main heat exchange station), a compressed air energy storage turbine exhaust (exhaust heat supplier) and a parallel heat supply pipeline.
At night in a heating season, the electric load demand is low, the heat load demand is high, the wind power output power is high due to the anti-peak-shaving characteristic of the wind power, and the peak shaving demand exists in the system. In order to absorb redundant electric power, besides normal power supply of the conventional condensing unit A1, the intelligent scheduling control system A4 not only requires the output level of the combined heat and power unit to be low, but also requires the thermoelectric compressed air energy storage system to operate in an energy storage mode so as to absorb redundant wind power. At this time, the redundant wind power is divided into two streams by the intelligent scheduling control system A4. The larger strand of the compressed air energy storage module is distributed to the heat insulation compressed air energy storage module and used for storing compressed air to realize electric energy-pressure energy conversion; the smaller strand is distributed to the electric/thermal heat storage module and used for electrically heating the heat storage medium to realize electric energy-heat energy conversion. In addition, in the aspect of heat supply, because the output level of the cogeneration unit A3 is low, the heat supply is not enough to meet the load demand, and the shortage is partially compensated by the 'steam extraction and heat storage' stored in the heat storage loop of the electricity/heat storage module. In summary, under the condition, the thermoelectric compressed air energy storage system operates in an energy storage-steam extraction heat storage heat release mode, power supply is provided by a conventional pure condensing unit, a combined heat and power supply unit and a wind power unit together, heat supply is provided by a combined heat and power supply unit (a main heat exchange station) and a heat and heat storage module (an auxiliary heat exchange station) for storing the thermoelectric compressed air energy, and the heat supply is realized through parallel heat supply pipelines.
It is noted that the solid regenerators in the compressed air energy storage system can be considered as compressor aftercoolers and turbine preheaters. In addition, the exhaust heat supply device at the exhaust side of the turbine is connected with the main heat exchange station and the auxiliary heat exchange station in parallel.
Examples
A thermoelectric compressed air energy storage system adopting a thermoelectric unit for extracting steam and storing heat is shown in figure 1 and comprises a power module, a heat supply module, a heat insulation compressed air energy storage module and an electric/heat storage module. The power supply module comprises a conventional condensing unit, a wind turbine generator, a combined heat and power supply unit A3, an intelligent scheduling control system A4 and the like; the compressed air energy storage module consists of a low-pressure compressor 1, a high-pressure compressor 3, a high-pressure turbine 8, a low-pressure turbine 10, an intercooler 2, a reheater 9, a solid heat accumulator 4, an air storage volume 6, a first clutch 11, a second clutch 12 and a motor 13 (when energy is released, the motor is in a generator mode, and when energy is stored, the motor is in a motor processing mode); the electric/thermal heat storage module comprises a cold-state liquid storage tank B1, a medium-temperature liquid storage tank B8, a high-temperature liquid storage tank B5, an electric heater B4, a steam extraction heat exchanger B7, a three-way valve and the like; the heat supply module comprises a main heat exchange station C1, an auxiliary heat exchange station C2, an exhaust heat supply device C3, a three-way valve, a four-way valve and the like. The system adopts a heat management mode of one-stage solid and one-stage liquid sensible heat storage and also can adopt a heat management mode of two-stage liquid sensible heat storage. In addition, the electric/thermal heat storage module comprises a thermal heat storage loop and an electric heat storage loop, and the functions of steam extraction heat storage and electric heat storage are respectively realized.
The main working principle is described as follows:
in a heating season, the conventional condensing unit A1, the wind turbine A2 and the combined heat and power unit A3 are energy sources of an electric power system, and supply of electric energy and heat energy to end users under the coordination of the intelligent scheduling control system A4. The compressed air energy storage module and the electric/thermal heat storage module are used as energy buffering modules of the system and respectively store and release electric energy and thermal energy. The heat supply module provides continuous and stable heat energy supply for the system under different working modes of the system.
1. During the heating season, the electrical load demand is high and the thermal load demand is low. In order to meet the requirement of higher electric load level, the output level of the combined heat and power unit A3 is high, and the thermoelectric compressed air energy storage system needs to operate in an energy release mode. At this time, on the premise that the system meets the heat supply requirement, the steam for redundant heat supply generated by the cogeneration unit A3 is thermally stored in the thermal storage loop of the electric/thermal heat storage module in a steam extraction manner (i.e., steam extraction and heat storage). The specific working principle is as follows:
the electric load demand during the heating season daytime is high, all generated power when conventional condensing unit A1, wind turbine generator system A2 and combined heat and power supply unit A3 still have the power supply shortage after distributing to end user through intelligent scheduling control system A4, and thermoelectric compressed air energy storage system work is in the energy release mode this moment, and first clutch 11 disconnection, the meshing of second clutch 12, motor 13 operate in generator mode, and first valve 5 closes, and second valve 7 opens. High-pressure air in the air storage volume 6 flows through the second valve 7 and then enters the solid heat accumulator 4 to absorb heat in the compression process stored in the solid heat accumulator to raise the temperature, the air after being heated enters the high-pressure turbine 8 to expand and do work, exhaust of the high-pressure turbine 8 enters the reheater 9 to absorb heat stored in an electric/thermal heat storage loop in the electric/thermal heat storage module to raise the temperature, then the exhaust enters the low-pressure turbine 10 to continue to expand and do work, at the moment, the two-stage turbine drives the generator to generate electricity to make up the difference of electric energy, and exhaust of the low-pressure turbine 10 enters the exhaust heat supplier C3 to release heat and then is discharged to the atmosphere. Meanwhile, in an electric heat storage loop of the electric/heat storage module, a high-temperature heat storage medium in the high-temperature liquid storage tank B5 flows out, enters the reheater 9 to release heat, heats, exhausts and cools the high-pressure turbine, and then is stored in the cold-state liquid storage tank B1 through the third three-way valve B6.
On the other hand, because the heat load demand in the heating seasons and the daytime is low, the intelligent scheduling control system A4 preferentially uses the low-pressure turbine 10 exhaust gas in the energy release stage of the thermoelectric compressed air energy storage module to supply heat, at the moment, in the exhaust heat supply device C3, one strand of heat supply backwater flowing from the second four-way valve C7 enters the exhaust heat supply device C3 to absorb the exhaust waste heat of the low-pressure turbine 10, and is converged into a main heat supply water supply loop through the first four-way valve C6 to supply partial heat after being heated, so that the energy gradient utilization is realized; the remaining part of heat supply is satisfied by the combined heat and power unit A3 with a higher output level, at this moment, the heat supply extraction steam of the combined heat and power unit A3 flows into the main heat exchange station C1 through the fifth three-way valve C4 to release heat, the extraction steam after temperature reduction flows back to the combined heat and power unit A3 through the sixth three-way valve C5, meanwhile, the other part of heat supply return water flowing through the second four-way valve C7 enters the main heat exchange station C1 to absorb the heat released by the extraction steam, and the heat supply return water is converged into the main heat supply water supply loop through the first four-way valve C6 to supply the remaining part of heat supply after temperature rise. However, because the output level of the cogeneration unit A3 is high, thermal power still exists outside the requirement of thermal load, the excess waste heat power is stored in a steam extraction and heat storage manner, the excess extracted steam of the cogeneration unit A3 flows into the steam extraction heat exchanger B7 through the fifth three-way valve C4 to release heat, returns to the cogeneration unit A3 through the sixth three-way valve C5 after being cooled, and meanwhile, the cold-state heat storage medium of the cold-state liquid storage tank B1 flows through the first three-way valve B2 and the seventh three-way valve B10 and then enters the steam extraction heat exchanger B7, absorbs the heat released by the extracted steam, is heated to become a medium-temperature heat storage medium, and is stored in the medium-temperature liquid storage tank B8. Under the condition, the system heat supply is provided by the main heat exchange station C1 and the exhaust heat supply device C3 together, namely, the combined heat and power unit and the compressed air energy storage turbine exhaust form is realized through parallel heat supply pipelines.
2. At night in a heating season, the electric load demand is low, the heat load demand is high, the wind power output power is high due to the anti-peak-load-regulation characteristic of the wind power, and the peak regulation demand exists in the system. In order to process the redundant electric power, the output level of the cogeneration unit A3 should be reduced, and the thermoelectric compressed air energy storage system needs to operate in an energy storage mode. At this time, the cogeneration unit A3 has a shortage of heat supply due to a decrease in the output level, and needs to be compensated for by using a heat storage circuit (i.e., steam extraction and heat storage) of the electricity/heat storage module. The specific working principle is as follows:
the electric load demand at night in the heating season is low, the output level of the combined heat and power unit A3 needs to be reduced, when the generated power of the conventional condensing unit A1, the wind turbine generator A2 and the combined heat and power unit A3 is supplied to a terminal user through the intelligent scheduling control system A4, redundant electric power still exists, the thermoelectric compressed air energy storage system works in an energy storage mode at the moment, and the intelligent scheduling control system A4 distributes redundant electric energy to the compressed air energy storage module and the electric heat storage loop of the electric/heat energy storage module respectively according to a reasonable electric energy distribution ratio by utilizing a preset algorithm. For the compressed air energy storage module, the first clutch 11 is engaged, the second clutch 12 is disengaged, the electric machine 13 is operated in motor mode, the first valve 5 is open and the second valve 7 is closed. The motor 13 drives the two-stage compressor to compress air by using a distributed electric energy, ambient air enters the low-pressure compressor 1 to be compressed and then enters the intercooler 2, the high-pressure compressor 3 continues to compress and boost the pressure after releasing the heat in the compression process and then enters the solid heat accumulator 4 to release the heat in the compression process and then is stored in the air storage volume 6 through the first valve 5, and meanwhile, the solid heat storage medium in the solid heat accumulator 4 absorbs the heat in the compression process and then is heated to realize heat storage. For an electric heat storage loop of the electric/thermal heat storage module, a cold-state heat storage medium in the cold-state liquid storage tank B1 enters the intercooler 2 through the first three-way valve B2, absorbs heat of a compression process exhausted by the low-pressure compressor to raise the temperature, then flows through the second three-way valve B3, enters the electric heater B4 to continue heating by using the other distributed electric energy, and generates a high-temperature heat storage medium after the temperature is raised and stores the high-temperature heat storage medium in the high-temperature liquid storage tank B5.
On the other hand, the demand of heat load at night in the heating season is high, the cogeneration unit A3 has insufficient heat supply capacity due to the reduction of the output level, and the heat supply power of the system is deficient, and at this time, the heat storage loop (i.e. steam extraction and heat storage) of the electricity/heat storage module is used for supplement. The intelligent dispatching control system A4 firstly dispatches the combined heat and power unit A3 to supply heat, heat supply extraction steam of the combined heat and power unit A3 flows into the main heat exchange station C1 through the fifth three-way valve C4 to release heat, the extraction steam after temperature reduction flows back to the combined heat and power unit A3 through the sixth three-way valve C5, meanwhile, a piece of heat supply return water flowing through the second four-way valve C7 enters the main heat exchange station C1 to absorb the extraction steam to release heat, and the heat supply return water is converged into a main heat supply water supply loop through the first four-way valve C6 to provide partial heat supply after temperature rise. Meanwhile, the medium-temperature heat storage medium stored in the medium-temperature liquid storage tank B8 of the electric/thermal heat storage module heat storage loop flows out, enters the auxiliary heat exchange station C2 through the fourth three-way valve B9 to release heat, flows through the third three-way valve B6 after being cooled, and is stored in the cold-state liquid storage tank B1. At the moment, the other part of the heat supply backwater flowing from the second four-way valve C7 enters the secondary heat exchange station C2, and is collected into the main heat supply water supply loop through the first four-way valve C6 after absorbing heat and raising temperature to provide the rest heat supply. Under the condition, the heat supply of the system is provided by the main heat exchange station C1 and the auxiliary heat exchange station C2 together, namely, the form of 'cogeneration unit + steam extraction heat storage heat release' is realized by parallel heat supply pipelines.
Notably, there are some limit cases: if the heat storage quantity of a heat storage loop (namely, steam extraction and heat storage) of the daytime electric/heat storage module is too much to exceed the heat supply requirement, the medium-temperature heat storage medium in the medium-temperature liquid storage tank B8 respectively passes through the fourth three-way valve B9 and the second three-way valve B3 and then enters the electric heater B4, the electric heater is continuously heated by using the electric energy distributed to the electric heat storage loop, and the medium is heated to be the high-temperature heat storage medium and then stored in the high-temperature liquid storage tank B5. In addition, if the heat storage amount of the heat storage loop (i.e. steam extraction heat storage) of the daytime electric/heat storage module is too small to meet the heat supply requirement, the cold-state heat storage medium in the cold-state liquid storage tank B1 flows out, passes through the first three-way valve B2 and the seventh three-way valve B10, enters the auxiliary electric heater B11, is continuously heated by using the electric energy distributed to the electric heat storage loop, generates the medium-temperature heat storage medium, and then stores the medium-temperature heat storage medium in the medium-temperature liquid storage tank B8 to make up for the heat supply power gap. In addition, the intermediate-temperature heat storage medium may also be obtained by mixing the high-temperature heat storage medium in the high-temperature liquid storage tank B5 and the cold-state heat storage medium in the cold-state heat storage tank B1.
The above contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention should not be limited thereby, and any modification made on the basis of the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. The thermoelectric compressed air energy storage system is characterized by comprising an adiabatic compressed air energy storage module, an electric/thermal heat storage module, a heat supply module and a power supply module, wherein the adiabatic compressed air energy storage module and the electric/thermal heat storage module jointly form the thermoelectric compressed air energy storage system;
the heat insulation compressed air energy storage module comprises a motor (13), wherein the two sides of the motor (13) are respectively connected with an energy storage module and an energy release module, the tail end of the energy release module is connected to a heat supply module, when the energy storage module runs, the motor (13) runs in a motor mode, and when the energy release module runs, the motor (13) runs in a generator mode;
the electric/thermal heat storage module comprises a cold-state liquid storage tank (B1), an electric heat storage loop and a thermal heat storage loop are connected between an outlet and an inlet of the cold-state liquid storage tank (B1), the electric heat storage loop comprises an electric heater (B4) and a high-temperature liquid storage tank (B5) which are sequentially connected, the energy storage module exchanges heat with the head end of the electric heat storage loop through an intercooler (2), and the energy release module exchanges heat with the tail end of the electric heat storage loop through a reheater (9); the heat storage loop comprises an auxiliary electric heater (B11) connected to the outlet of the cold-state liquid storage tank (B1), the outlet end of the auxiliary electric heater (B11) is connected to the medium-temperature liquid storage tank (B8), the outlet end of the medium-temperature liquid storage tank (B8) is divided into two paths, one path is connected to the inlet end of the electric heater (B4), the other path is connected to the inlet of the cold-state liquid storage tank (B1) after heat exchange of the heat supply module, and the inlet end of the auxiliary electric heater (B11) is further connected to the medium-temperature liquid storage tank (B8) through a steam extraction heat exchanger (B7);
the heat supply module comprises a main heat exchange station (C1), an auxiliary heat exchange station (C2) and an exhaust heat supply device (C3), the tail end of the energy release module is connected to the exhaust heat supply device (C3), and the auxiliary heat exchange station (C2) is used for being connected with the other path of the outlet end of the medium-temperature liquid storage tank (B8) for heat exchange;
the power supply module comprises a conventional condensing unit (A1), a wind turbine generator (A2), a combined heat and power supply unit (A3) and an intelligent scheduling control system (A4), wherein the conventional condensing unit (A1), the wind turbine generator (A2) and the combined heat and power supply unit (A3) supply power to a user, an electric heater (B4), an auxiliary electric heater (B11) and a motor (13) through the intelligent scheduling control system (A4); an extraction steam outlet of the cogeneration unit (A3) is connected to an extraction steam heat exchanger (B7), extraction steam is released in the extraction steam heat exchanger (B7) and then returns to the cogeneration unit (A3) through an extraction steam inlet connected to the cogeneration unit (A3), the main heat exchange station (C1) is connected between the extraction steam inlet and the extraction steam outlet of the cogeneration unit (A3), an outlet end of the auxiliary heat exchange station (C2), an outlet end of the main heat exchange station (C1) and an outlet end of the exhaust heat supply device (C3) are connected to user heat supply water, and the user heat supply return water is respectively connected to an inlet end of the auxiliary heat exchange station (C2), an inlet end of the main heat exchange station (C1) and an inlet end of the exhaust heat supply device (C3);
the energy storage module comprises a low-pressure compressor (1) and a high-pressure compressor (3), the low-pressure compressor (1) and the high-pressure compressor (3) are coaxially arranged, a pipeline between an air outlet of the low-pressure compressor (1) and an air inlet of the high-pressure compressor (3) is connected with the intercooler (2), the high-pressure compressor (3) is connected with the motor (13) through a first clutch (11), an air outlet of the high-pressure compressor (3) is connected to the air storage volume (6) through a solid heat accumulator (4), and a first valve (5) is arranged between the solid heat accumulator (4) and the air storage volume (6);
the energy releasing module comprises a high-pressure turbine (8) and a low-pressure turbine (10), the high-pressure turbine (8) and the low-pressure turbine (10) are coaxially arranged, the high-pressure turbine (8) is connected with a motor (13) through a second clutch (12), the outlet end of the gas storage volume (6) is connected to the gas inlet of the high-pressure turbine (8) through a solid heat accumulator (4), a second valve (7) is arranged between the gas storage volume (6) and the solid heat accumulator (4), a pipeline is connected with a reheater (9) between the gas outlet of the high-pressure turbine (8) and the gas inlet of the low-pressure turbine (10), and the outlet end of the low-pressure turbine (10) is connected to an exhaust heat supply device (C3).
2. The thermoelectric compressed air energy storage system adopting the thermoelectric generating set for steam extraction and heat storage as claimed in claim 1, wherein a first three-way valve (B2) is provided at an outlet end of the cold state liquid storage tank (B1), a first port of the first three-way valve (B2) is connected with the outlet end of the cold state liquid storage tank (B1), a second port of the first three-way valve (B2) is connected with an inlet end of the intercooler (2), and a third port of the first three-way valve (B2) is connected with a seventh three-way valve (B10);
and a first port of the seventh three-way valve (B10) is connected with a third port of the first three-way valve (B2), a second port of the seventh three-way valve (B10) is connected to the inlet end of the auxiliary electric heater (B11), and a third port of the seventh three-way valve (B10) is connected to the inlet end of the steam extraction heat exchanger (B7).
3. The thermoelectric compressed air energy storage system adopting the thermoelectric generator set for extracting and storing steam and heat as claimed in claim 1, wherein a second three-way valve (B3) is arranged between the outlet end of the intercooler (2) and the inlet end of the electric heater (B4), a first port of the second three-way valve (B3) is connected with the outlet end of the intercooler (2), and a second port of the second three-way valve (B3) is connected with the inlet end of the electric heater (B4);
the outlet end of the medium-temperature liquid storage tank (B8) is provided with a fourth three-way valve (B9), a first port of the fourth three-way valve (B9) is connected with the outlet end of the medium-temperature liquid storage tank (B8), a second port of the fourth three-way valve (B9) is connected to the inlet end of the auxiliary heat exchange station (C2), and a third port of the fourth three-way valve (B9) is connected with a third port of the second three-way valve (B3).
4. The thermoelectric compressed air energy storage system adopting the thermoelectric generating set for steam extraction and heat storage according to claim 1, wherein a third three-way valve (B6) is arranged at the inlet end of the cold state liquid storage tank (B1), a first port of the third three-way valve (B6) is connected with the inlet end of the cold state liquid storage tank (B1), a second port of the third three-way valve (B6) is connected with the outlet end of the reheater (9), and a third port of the third three-way valve (B6) is connected with the outlet end of the secondary heat exchange station (C2).
5. The thermoelectric compressed air energy storage system adopting the thermoelectric generating set to extract steam and store heat according to claim 1, wherein a fifth three-way valve (C4) is arranged between the steam extraction outlet of the thermoelectric cogeneration unit (A3) and the inlet end of the steam extraction heat exchanger (B7), a first port of the fifth three-way valve (C4) is connected with the steam extraction outlet of the thermoelectric cogeneration unit (A3), a second port of the fifth three-way valve (C4) is connected with the inlet end of the steam extraction heat exchanger (B7), and a third port of the fifth three-way valve (C4) is connected with the steam inlet of the main heat exchange station (C1);
a sixth three-way valve (C5) is arranged between the outlet end of the steam extraction heat exchanger (B7) and the steam extraction inlet of the cogeneration unit (A3), a first port of the sixth three-way valve (C5) is connected with the outlet end of the steam extraction heat exchanger (B7), a second port of the sixth three-way valve (C5) is connected with the steam extraction inlet of the cogeneration unit (A3), and a third port of the sixth three-way valve (C5) is connected with the steam outlet of the main heat exchange station (C1).
6. The thermoelectric compressed air energy storage system adopting the thermoelectric generating set to extract steam and store heat according to claim 1, wherein a first four-way valve (C6) is arranged at a heat supply and water supply outlet of the main heat exchange station (C1), a first port of the first four-way valve (C6) is connected with the heat supply and water supply outlet of the main heat exchange station (C1), a second port of the first four-way valve (C6) is connected with the heat supply and water supply outlet of the auxiliary heat exchange station (C2), a third port of the first four-way valve (C6) is connected with the heat supply and water supply outlet of the exhaust heat supply device (C3), and a fourth port of the first four-way valve (C6) is connected with heat supply and water supply of a user.
7. The thermoelectric compressed air energy storage system adopting the steam extraction and heat storage of the thermoelectric generating set as claimed in claim 6, wherein a second four-way valve (C7) is arranged at a heat supply and water return inlet of the main heat exchange station (C1), a first port of the second four-way valve (C7) is connected with the heat supply and water return inlet of the main heat exchange station (C1), a second port of the second four-way valve (C7) is connected with the heat supply and water return inlet of the auxiliary heat exchange station (C2), a third port of the second four-way valve (C7) is connected with the heat supply and water return inlet of the exhaust heat supply device (C3), and a fourth port of the second four-way valve (C7) is connected with heat supply and water return of users.
8. A thermoelectric compressed air energy storage method adopting a thermoelectric unit to extract steam and store heat, which adopts the system of any one of claims 1 to 7 and is characterized by comprising a heating season daytime mode and a heating season nighttime mode;
when the system is in a heating season and daytime mode, the electric load demand is high, all the power generation power of the conventional condensing unit (A1), the wind turbine unit (A2) and the combined heat and power unit (A3) is distributed to end users through the intelligent scheduling control system (A4), and then the power supply shortage still exists, at the moment, the thermoelectric compressed air energy storage system works in an energy release mode, the energy release module exhausts air and enters the exhaust heat supply device (C3) to release heat and then exhausts the heat to the atmosphere, meanwhile, in an electric heat storage loop of the electric/heat storage module, a high-temperature heat storage medium in the high-temperature liquid storage tank (B5) flows out and enters the reheater (9) to release heat, and then the high-temperature heat storage medium is stored in the cold-state liquid storage tank (B1);
on the other hand, the heat load demand in the heating seasons and the daytime is low, the intelligent scheduling control system (A4) preferentially uses the exhaust of the energy release module for heat supply, at the moment, in the exhaust heat supply device (C3), one strand of heat supply backwater enters the exhaust heat supply device (C3) to absorb the exhaust waste heat of the energy release module, and the strand of heat supply backwater is converged into the total heat supply water supply loop after being heated to provide partial heat supply, so that the energy gradient utilization is realized; the remaining part of heat supply is satisfied by a combined heat and power unit (A3) with higher output level, at the moment, heat supply extraction steam of the combined heat and power unit (A3) flows into a main heat exchange station (C1) to release heat, extraction steam after cooling returns to the combined heat and power unit (A3), meanwhile, the other strand of heat supply return water enters the main heat exchange station (C1) to absorb extraction steam to release heat, the extraction steam is converged into a main heat supply water supply loop to provide the remaining part of heat supply after heating, redundant extraction steam of the combined heat and power unit (A3) flows into an extraction steam heat exchanger (B7) to release heat, the extraction steam returns to the combined heat and power unit (A3) after cooling, meanwhile, a cold heat storage medium of a liquid storage tank (B1) enters an extraction steam heat exchanger (B7), the extraction steam is heated to become a medium temperature heat storage medium after absorbing heat release, and the medium temperature heat storage tank (B8) is stored in a medium temperature liquid storage tank (B8);
when the electric energy storage device is in a night mode of a heating season, the electric load demand is low, redundant electric power still exists after the generated power of the conventional condensing unit (A1), the wind turbine generator unit (A2) and the combined heat and power unit (A3) is supplied to a terminal user through the intelligent scheduling control system (A4), at the moment, the thermoelectric compressed air energy storage system works in an energy storage mode, the intelligent scheduling control system (A4) distributes redundant electric energy to the electric heat storage loops of the heat insulation compressed air energy storage module and the electric/thermal heat storage module respectively according to a reasonable electric energy distribution ratio, for the heat insulation compressed air energy storage module, the electric motor operates in the energy storage mode and performs air compression by using the distributed electric energy to realize compressed heat storage, for the electric heat storage loop of the electric/thermal heat storage module, a cold-state heat storage medium in the cold-state liquid storage tank (B1) enters the intercooler (2), absorbs the heat in the compression process of the energy storage module to heat up, then enters the electric heater (B4) to continue heating, and a high-temperature-storage medium is generated after heating is stored in the high-temperature liquid storage tank (B5);
on the other hand, the heat load demand is high in the heating season at night, the intelligent scheduling control system (A4) firstly schedules the combined heat and power unit (A3) to supply heat, heat supply steam of the combined heat and power unit (A3) flows into the main heat exchange station (C1) to release heat, cooled steam flow returns to the combined heat and power unit (A3), meanwhile, one heat supply backwater enters the main heat exchange station (C1) to absorb the heat released by the steam, after the temperature is raised, the heat supply backwater converges into the main heat supply water supply loop to provide partial heat supply, meanwhile, a medium temperature medium stored in a medium temperature liquid storage tank (B8) of the heat storage loop of the electricity/heat storage module flows out, enters the auxiliary heat exchange station (C2) to release heat, after the temperature is lowered, the other heat supply backwater enters the auxiliary heat exchange station (C2), after the heat absorption and the temperature is raised, the other heat supply backwater converges into the main heat supply water supply loop to provide the rest part of heat supply;
in addition, if the heat storage quantity of the heat storage loop of the daytime electric/heat storage module exceeds the heat supply requirement, the medium-temperature heat storage medium in the medium-temperature liquid storage tank (B8) enters the electric heater (B4), the electric energy distributed to the electric heat storage loop is used for continuing heating, the medium-temperature heat storage medium is heated to be the high-temperature heat storage medium and then stored in the high-temperature liquid storage tank (B5), in addition, if the heat storage quantity of the heat storage loop of the daytime electric/heat storage module cannot meet the heat supply requirement, the cold-state heat storage medium in the cold-state liquid storage tank (B1) flows out and enters the auxiliary electric heater (B11), the electric energy distributed to the electric heat storage loop is used for continuing heating, and the medium-temperature heat storage medium is generated and then stored in the medium-temperature liquid storage tank (B8) so as to make up the heat supply power gap.
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| BE706183A (en) * | 1966-11-07 | 1968-05-07 | ||
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| CN106050571A (en) * | 2016-07-05 | 2016-10-26 | 西安交通大学 | Communication base station comprehensive energy supply system and method based on wind-solar complementation |
| WO2019165807A1 (en) * | 2018-02-28 | 2019-09-06 | 山东大学 | Combined cooling, heating and power system |
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| BE706183A (en) * | 1966-11-07 | 1968-05-07 | ||
| CN105043147A (en) * | 2015-06-25 | 2015-11-11 | 中国科学院理化技术研究所 | Liquefied compressed air energy storage system adopting liquid cold accumulation working medium |
| CN106050571A (en) * | 2016-07-05 | 2016-10-26 | 西安交通大学 | Communication base station comprehensive energy supply system and method based on wind-solar complementation |
| WO2019165807A1 (en) * | 2018-02-28 | 2019-09-06 | 山东大学 | Combined cooling, heating and power system |
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