CN117287374A - Adiabatic compressed air energy storage system of coupling spotlight heat accumulation-organic Rankine cycle - Google Patents
Adiabatic compressed air energy storage system of coupling spotlight heat accumulation-organic Rankine cycle Download PDFInfo
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- CN117287374A CN117287374A CN202311265297.XA CN202311265297A CN117287374A CN 117287374 A CN117287374 A CN 117287374A CN 202311265297 A CN202311265297 A CN 202311265297A CN 117287374 A CN117287374 A CN 117287374A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 46
- 230000008878 coupling Effects 0.000 title claims abstract description 8
- 238000010168 coupling process Methods 0.000 title claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 238000005338 heat storage Methods 0.000 claims abstract description 56
- 238000009833 condensation Methods 0.000 claims abstract description 10
- 230000005494 condensation Effects 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 9
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 238000007906 compression Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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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
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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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
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
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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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
-
- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
- F01K3/26—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by steam
- F01K3/262—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by steam by means of heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/063—Tower concentrators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
- F03G6/066—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle of the Organic Rankine Cycle [ORC] type or the Kalina Cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
- F03G6/067—Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/071—Devices for producing mechanical power from solar energy with energy storage devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- 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
- F04B39/06—Cooling; Heating; Prevention of freezing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to the technical field of energy storage, in particular to a coupling condensation heat storage-organic Rankine cycle adiabatic compressed air energy storage system, which comprises a compressed air energy storage unit, an organic Rankine cycle unit, a water heater heat supply unit, an air energy release unit and a condensation heat storage unit; the compressed air energy storage unit comprises a multistage compressor and an air storage tank, and the organic Rankine cycle unit comprises an ORC evaporator, an ORC steam turbine, an ORC condenser and a pump; the water heater heat supply unit comprises a hot water tank, a cold water tank and a water heater, and the air energy release unit comprises a throttle valve, a primary preheater, a secondary preheater, a pre-stage heater and a steam turbine which are sequentially arranged; the condensing heat storage unit includes a heat tank storing a heat storage medium, a cold tank, and a condensing heat collector. The system of the invention greatly improves the waste heat utilization efficiency while improving the energy storage efficiency of the system, and provides a new solution for the problems of wind and light abandoning and peak clipping and valley filling.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a coupling condensation heat storage-organic Rankine cycle adiabatic compressed air energy storage system.
Background
With the increasing development of renewable energy sources, in terms of the development situation of China, renewable resource power generation gradually replaces thermal power generation in the future, and finally a power generation network mainly based on new energy power generation and assisted in the traditional power generation mode is formed. However, due to uncertainty, randomness and intermittence caused by weather, position or airflow changes, a large amount of waste wind and waste light are generated, so that the energy utilization efficiency is reduced, and the energy storage system is a key means for solving the problem of waste wind and waste light. The compressed air energy storage is suitable for large-scale electricity storage due to large energy storage scale, high energy storage efficiency, long service life, cleanness and no pollution. The traditional compressed air energy storage requires fossil energy for afterburning, causes environmental pollution and depends on the fossil energy, and a large amount of waste heat is wasted. The heat-insulating compressed air energy storage abandons the combustion chamber, and the compression heat in the compression process is collected to replace fossil energy for afterburning, so that the compression heat often does not meet the heat required in the energy release process, and the energy storage efficiency is lower although the dependence on fossil energy is eliminated, and the environmental pollution is lightened.
The prior patent has a plurality of defects in the aspects of waste heat utilization of heat storage media and low-grade heat utilization of a compressed air energy storage system coupled with photo-thermal.
Disclosure of Invention
The adiabatic compressed air energy storage system of the coupling condensation heat storage-organic Rankine cycle provided by the invention has the advantages that the energy storage efficiency of the system is improved, the waste heat utilization efficiency is greatly improved, and a new solution is provided for the problems of wind discarding and light discarding and peak clipping and valley filling.
Some embodiments employed to solve the above technical problems include:
a coupling condensation heat accumulation-organic Rankine cycle adiabatic compressed air energy storage system comprises a compressed air energy storage unit, an organic Rankine cycle unit, a water heater heat supply unit, an air energy release unit and a condensation heat accumulation unit;
the compressed air energy storage unit comprises a multi-stage compressor and an air storage tank, an inter-stage cooler is arranged between adjacent compressors, and air enters the air storage tank after being compressed and cooled by the multi-stage compressor and the inter-stage cooler;
the organic rankine cycle unit includes an ORC evaporator, an ORC turbine, an ORC condenser, and a pump;
the water heater heat supply unit comprises a hot water tank, a cold water tank and a water heater, cold water in the cold water tank enters the hot water tank after being heated by the inter-stage cooler, the hot water tank is communicated with the water heater, and the water heater is used for heating industrial cooling water;
the air energy release unit comprises a throttle valve, a primary preheater, a secondary preheater, a pre-stage heater and a steam turbine which are sequentially arranged; the inlet of the throttle valve is connected with the outlet of the air storage tank, the air outlet of the steam turbine is connected to the preheated air inlet of the secondary preheater, and the preheated air outlet of the secondary preheater is connected to the air inlet of the water heater;
the concentrating heat storage unit comprises a heat tank for storing heat storage medium, a cold tank and a concentrating heat collector; the heat storage medium in the cold tank is heated by the light-gathering heat collector and then enters the hot tank for storage; the heat tank outlet is connected to the heat storage medium inlet of the pre-stage cooler, the heat storage medium outlet of the pre-stage cooler is connected to the ORC evaporator, the heat storage medium outlet of the ORC evaporator is connected to the heat storage medium inlet of the primary preheater, and the heat storage medium outlet of the primary preheater is connected to the cold tank inlet.
As one of the preferable aspects of the present invention, the hot water outlet of the hot water tank is connected to the waterway inlet of the ORC evaporator, and the waterway outlet of the ORC evaporator is connected to the preheating water inlet of the water heater.
As one of the preferred embodiments of the present invention, the hot water outlet of the hot water tank is further connected to the waterway inlet of the primary preheater, and the waterway outlet of the primary preheater is connected to the waterway inlet of the ORC evaporator.
As one of the preferred embodiments of the present invention, the heat storage medium outlet of the ORC evaporator is also connected to the cold tank inlet.
As one of the preferable embodiments of the present invention, the water side outlet of the ORC condenser is connected to the cooling water inlet of the water heater, and industrial cooling water is supplied to the user after being heated by the ORC condenser and the water heater in this order.
As one of the preferable schemes of the invention, the concentrating solar collector is a tower-type or trough-type concentrating solar collector.
As one of the preferable embodiments of the present invention, the heat storage medium is molten salt or heat transfer oil.
As one preferable scheme of the invention, the multistage compressor is a four-stage compressor, and an outlet of each stage of compressor is connected with an inter-stage cooler.
As one of the preferable schemes of the invention, the pre-stage heater is two stages, the outlet of each stage of pre-stage heater is connected with a steam turbine, and the outlet of the tail steam turbine is connected with the preheating air inlet of the secondary preheater.
As one of the preferred embodiments of the present invention, the heat storage medium storage device further comprises a control unit for controlling the heat source of the primary preheater and the trend of the heat storage medium at the outlet of the ORC evaporator according to the heating load.
Compared with the prior art, the invention has the following beneficial effects:
the system of the invention improves the inlet temperature of each stage of the air turbine, thereby improving the output power of the air turbineThereby improving the overall efficiency of the system; meanwhile, an ORC organic Rankine cycle power generation technology is adopted to couple the compressed air energy storage system, and compression heat generated in the process of compressing air is utilized to supply heat, so that the overall power generation efficiency is improved; then, the waste heat after the compression heat supplies heat to the ORC is utilized to produce hot water; finally, the air is preheated by utilizing high-temperature exhaust and low-temperature concentrating solar heat transfer medium of the air turbine, so that the energy utilization efficiency is greatly improved. According to calculation, the electricity storage efficiency of the system can reach 115%,the highest efficiency can reach 78%, which is higher than that of the conventional compressed air unit, and the daily production of hot water at 60 ℃ can reach 73.5-106.5 tons according to different heat supply requirements.
Drawings
For purposes of explanation, several embodiments of the present technology are set forth in the following figures. The following drawings are incorporated herein and constitute a part of this detailed description. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring the concepts of the subject technology.
FIG. 1 is a schematic diagram of the system flow of the system of the present invention when the heating load is large.
Fig. 2 is a schematic diagram of a system flow of the system of the present invention when the heating load is small.
In the figure:
1. compressor, inter-stage cooler, air storage tank, throttle valve, primary preheater, secondary preheater, primary preheater, steam turbine, hot water tank, cold water tank, 11 ORC evaporator,
an ORC turbine, 13.ORC condenser, 14. Pump, 15. Water heater, 16. Heat tank, 17. Concentrating collector, 18. Cold tank.
1. Detailed description of the preferred embodiments
The specific embodiments illustrated below are intended as descriptions of various configurations of the subject technology and are not intended to represent the only configurations in which the subject technology may be practiced. Particular embodiments include specific details for the purpose of providing a thorough understanding of the subject technology. It will be clear and apparent, however, to one skilled in the art that the subject technology is not limited to the specific details shown herein and may be practiced without these specific details.
Referring to fig. 1, the application proposes an adiabatic compressed air energy storage system of a coupled condensation heat storage-organic rankine cycle, which comprises a compressed air energy storage unit, an organic rankine cycle unit, a water heater heating unit, an air energy release unit and a condensation heat storage unit;
the compressed air energy storage unit comprises multi-stage compressors 1-1 to 1-4 and an air storage tank 3, interstage coolers 2-1 to 2-4 are arranged between adjacent compressors, and air is compressed and cooled by the multi-stage compressors and the interstage coolers to form high-pressure normal-temperature air which enters the air storage tank 3 for storage;
the ORC unit comprises an ORC evaporator 11, an ORC turbine 12, an ORC condenser 13 and a pump 14;
the water heater heat supply unit comprises a hot water tank 9, a cold water tank 10 and a water heater 15, cold water in the cold water tank 10 is respectively heated by inter-stage coolers 2-1 to 2-4 and then enters the hot water tank 9, and the hot water tank 9 is communicated with the water heater 15; the water heater 15 is used for heating industrial cooling water;
the air energy release unit comprises a throttle valve 4, a primary preheater 5, a secondary preheater 6, a pre-stage heater 7-1/7-2 and a steam turbine 8-1/8-2 which are sequentially arranged; the inlet of the throttle valve 4 is connected with the outlet of the air storage tank 4, the air outlet of the steam turbine 8-2 is connected with the preheated air inlet of the secondary preheater 6, and the preheated air outlet of the secondary preheater 6 is connected with the air inlet of the water heater 15;
the concentrating and heat-storing unit comprises a hot tank 16 for storing heat-storing medium, a cold tank 18 and a concentrating collector 17; the heat storage medium in the cold tank 18 is heated by the light-gathering heat collector 17 and then enters the hot tank 16 for storage; the outlet of the heat tank 16 is connected to the heat storage medium inlet of the pre-stage cooler 7-1/7-2, the heat storage medium outlet of the pre-stage cooler 7-1/7-2 is connected to the ORC evaporator 11, the heat storage medium outlet of the ORC evaporator 11 is connected to the heat storage medium inlet of the primary preheater 5, and the heat storage medium outlet of the primary preheater 5 is connected to the inlet of the cold tank 18.
The condensing collector 17 adopts a tower type or trough type condensing solar collector to convert solar energy into heat energy of a heat storage medium, the heat energy enters the heat tank 16 for storage, and when the system releases energy for power generation, the heat storage medium in the heat tank is used for heating compressed air and an ORC evaporator, so that the inlet temperature of each stage of steam turbine is improved, and the overall efficiency of the system is improved.
In the embodiment, the four-stage inter-stage cooler and the two-stage pre-stage heater are adopted, so that the stages of the inter-stage cooler and the two-stage pre-stage heater can be changed along with specific working conditions in order to meet the requirements of different working conditions, and the technical scheme is not limited.
The energy storage medium may be a molten salt or a heat transfer oil, preferably a binary solar salt or a ternary mixed molten salt.
The organic Rankine cycle unit is coupled with the compressed air energy storage unit, the air energy release unit and the light-gathering heat storage unit, and heat generated in the process of compressed air and heat of a heat storage medium are utilized to supply heat together for generating electricity, so that the power generation efficiency of the whole system is improved. Meanwhile, in the air energy release unit, the high-temperature exhaust and low-temperature heat storage medium of the air turbine are utilized to carry out waste heat on the air, so that the energy utilization efficiency is greatly improved.
The system comprises a compression energy storage process and an energy release power generation process.
The compression energy storage process comprises gas storage, water storage and heat storage. The gas storage process is as follows: air is sequentially introduced into the four-stage compressors 1-1 to 1-4 and the inter-stage coolers 2-1 to 2-4 to form high-pressure normal-temperature air which is stored in the air storage tank 3. The water storage process is as follows: the air at the outlet of each stage of compressor enters an interstage cooler to exchange heat with water, so that cold water is heated into high-temperature hot water, and the hot water is stored in a hot water tank 9. The heat storage process is as follows: the low-temperature heat storage medium is stored in the cold tank 18, heated to a high-temperature heat storage medium by the tower-type concentrating solar collector 17, and stored in the hot tank 16.
The energy release power generation process needs to flow the stored compressed air, hot water and high-temperature heat storage medium, the water heater heat supply unit provides hot water, and the organic Rankine cycle generates power. When the system is specifically applied, the system can be divided into occasions with larger heat supply load and occasions with smaller heat supply load, and the system can control the trend of heat sources of the primary preheater 5 and heat storage media at the outlet of the ORC evaporator 11 according to the heat supply load requirement.
Referring to fig. 1, the flow paths of the media of each unit of the system and the working principle of the system are shown in the application occasion of the system with larger heating load.
In this embodiment, the hot water outlet of the hot water tank 9 is connected to the waterway inlet of the ORC evaporator 11, and the waterway outlet of the ORC evaporator 11 is connected to the preheated water inlet of the water heater 15.
In the energy release power generation process, a circulation loop of compressed air is as follows: after the pressure of the high-pressure normal-temperature air in the air storage tank 3 is regulated by the throttle valve 4, the air enters the primary preheater 5 and is heated by the low-temperature heat storage medium, and then enters the secondary preheater 6 and is heated by the low-pressure high-temperature air at the outlet of the steam turbine 8-2, namely the secondary preheater 6 is an air-air preheater. The compressed air after the two-stage preheating enters the two-stage pre-heater and the steam turbine and then returns to the two-stage preheater 6 to release heat to form medium-temperature exhaust gas, and the medium-temperature exhaust gas enters the water heater 15 to release heat and is discharged.
The hot water circulation loop is: the water in the cold water tank 10 is heated by the inter-stage cooler and then enters the hot water tank 9, and the hot water in the hot water tank 9 is returned to the cold water tank 10 after being discharged by the ORC evaporator 11 and the water heater 15. In the process, the heat supply unit of the water heater fully utilizes the compression heat generated by the compressed air and the evaporation heat generated by the organic Rankine cycle unit.
The circulation loop of the heat storage medium is as follows: the high-temperature heat storage medium in the heat tank 16 enters the two-stage pre-heaters 7-1 and 7-2 respectively, heats the air, enters the ORC evaporator 11 and the primary preheater 5 to release heat, and returns to the cold tank 18. In the process, the heat of the heat storage medium is utilized in a gradient manner, so that the inlet temperature of each stage of steam turbine in the air energy release unit is improved, and the overall efficiency of the system is improved.
In the organic Rankine cycle unit, the ORC evaporator fully utilizes the heat of hot water and medium-temperature heat storage medium, so that the power generation efficiency of the cycle unit is improved, the total energy efficiency of the system is improved, the additional investment on cooling equipment is reduced, and the power consumption in a plant is reduced.
Referring to fig. 2, the flow paths of the media of each unit of the system and the working principle of the system are shown in the application occasion of the system with smaller heating load.
In this embodiment, the hot water outlet of the hot water tank 9 is further connected to the water path inlet of the primary preheater 5, and the water path outlet of the primary preheater 5 is connected to the water path inlet of the ORC evaporator 11; the heat storage medium outlet of the ORC evaporator 11 is also connected to the inlet of the cold tank 18.
In the energy release power generation process, a circulation loop of compressed air is as follows: after the pressure of the high-pressure normal-temperature air in the air storage tank 3 is regulated by the throttle valve 4, the air enters the primary preheater 5 to be heated by hot water, and then enters the secondary preheater 6 to be heated by low-pressure high-temperature air at the outlet of the steam turbine 8-2. The compressed air after the two-stage preheating enters the two-stage pre-heater and the steam turbine and then returns to the two-stage preheater 6 to release heat to form medium-temperature exhaust gas, and the medium-temperature exhaust gas enters the water heater 15 to release heat and is discharged.
The hot water circulation loop is: the water in the cold water tank 10 is heated by the inter-stage cooler and then enters the hot water tank 9, and the hot water in the hot water tank 9 enters the primary preheater 5 to release heat and then returns to the cold water tank 10 after passing through the ORC evaporator 11 and the water heater 15 to release heat.
The circulation loop of the heat storage medium is as follows: the high temperature heat storage medium in the heat tank 16 enters the two-stage pre-heaters 7-1 and 7-2 respectively, heats the air, enters the ORC evaporator 11 to release heat, and then directly returns to the cold tank 18.
In the organic rankine cycle unit, the ORC evaporator 11 fully uses the heat of the intermediate-temperature hot water and the intermediate-temperature heat storage medium, and under the condition of ensuring the maximum low-temperature power generation capacity of the organic rankine cycle unit, the heat of the concentrated solar heat storage medium is fully utilized, and the rest of compressed heat flows to the water heater to produce a small amount of hot water.
Preferably, the water side outlet of the ORC condenser 13 is communicated with the cooling water inlet of the water heater 15, and industrial cooling water flows through the ORC condenser 13 and the water heater 15 in sequence to be heated and then supplied to a user, so that the waste heat generated by each component of the system is further utilized, and the energy-saving efficiency of the system is improved.
In summary, the invention adopts solar photo-thermal technology to supplement heat for the heat tank of the compressed air energy storage project, improves the inlet temperature of each stage of the steam turbine, further improves the overall efficiency of the system, overcomes the defect of low energy storage efficiency caused by the limitation of the compression heat of the conventional advanced adiabatic compressed air system by the outlet temperature of the compressor,low efficiency and the like, and realizes zero-carbon operation. According to calculation, the power generation efficiency of the novel adiabatic compressed air energy storage system adopting the coupling condensation heat storage-organic Rankine cycle is far greater than the power storage efficiency of conventional advanced adiabatic compressed air energy storage, and the highest power storage efficiency can reach 115 percent, and the power storage efficiency is->The highest efficiency can reach 78%; the application scene is widened, and the demonstration and technical development of related equipment are promoted; the method has higher economic and social benefits and engineering practical values in areas with better solar energy resources.
While the foregoing has been presented with a specific embodiment of the subject matter and with corresponding details, it should be understood that the foregoing description is only a few embodiments of the subject matter and that some details may be omitted when the embodiments are particularly implemented.
When implementing the subject matter technical scheme, the person skilled in the art can obtain other detail configurations or drawings according to the subject matter technical scheme and the drawings, and obviously, the details still belong to the scope covered by the subject matter technical scheme without departing from the subject matter technical scheme.
Claims (10)
1. An adiabatic compressed air energy storage system of coupling spotlight heat accumulation-organic rankine cycle, its characterized in that: the system comprises a compressed air energy storage unit, an organic Rankine cycle unit, a water heater heat supply unit, an air energy release unit and a condensation heat storage unit;
the compressed air energy storage unit comprises a multi-stage compressor and an air storage tank, an inter-stage cooler is arranged between adjacent compressors, and air enters the air storage tank after being compressed and cooled by the multi-stage compressor and the inter-stage cooler;
the organic rankine cycle unit includes an ORC evaporator, an ORC turbine, an ORC condenser, and a pump;
the water heater heat supply unit comprises a hot water tank, a cold water tank and a water heater, cold water in the cold water tank enters the hot water tank after being heated by the inter-stage cooler, the hot water tank is communicated with the water heater, and the water heater is used for heating industrial cooling water;
the air energy release unit comprises a throttle valve, a primary preheater, a secondary preheater, a pre-stage heater and a steam turbine which are sequentially arranged; the inlet of the throttle valve is connected with the outlet of the air storage tank, the air outlet of the steam turbine is connected to the preheated air inlet of the secondary preheater, and the preheated air outlet of the secondary preheater is connected to the air inlet of the water heater;
the concentrating heat storage unit comprises a heat tank for storing heat storage medium, a cold tank and a concentrating heat collector; the heat storage medium in the cold tank is heated by the light-gathering heat collector and then enters the hot tank for storage; the heat tank outlet is connected to the heat storage medium inlet of the pre-stage cooler, the heat storage medium outlet of the pre-stage cooler is connected to the ORC evaporator, the heat storage medium outlet of the ORC evaporator is connected to the heat storage medium inlet of the primary preheater, and the heat storage medium outlet of the primary preheater is connected to the cold tank inlet.
2. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 1, wherein: the hot water outlet of the hot water tank is connected to the waterway inlet of the ORC evaporator, and the waterway outlet of the ORC evaporator is connected to the preheated water inlet of the water heater.
3. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 1, wherein: the hot water outlet of the hot water tank is also connected to the waterway inlet of the primary preheater, and the waterway outlet of the primary preheater is connected to the waterway inlet of the ORC evaporator.
4. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 3, wherein: the heat storage medium outlet of the ORC evaporator is also connected to the cold tank inlet.
5. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 1, wherein: the water side outlet of the ORC condenser is communicated with the cooling water inlet of the water heater, and industrial cooling water flows through the ORC condenser and the water heater in sequence to be heated and then supplied to a user.
6. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 1, wherein: the concentrating collector is a tower-type or trough-type concentrating solar collector.
7. The novel adiabatic compressed air energy storage system of a coupled concentrator-thermal storage-organic rankine cycle of claim 1, wherein: the heat storage medium is molten salt or heat conduction oil.
8. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 1, wherein: the multistage compressors are four-stage compressors, and an outlet of each stage of compressor is connected with an interstage cooler.
9. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 1, wherein: the pre-stage heater is two stages, the outlet of each stage of pre-stage heater is connected with a steam turbine, and the outlet of the tail steam turbine is connected to the preheating air inlet of the secondary preheater.
10. The coupled concentrated heat storage-organic rankine cycle adiabatic compressed air energy storage system of claim 1, wherein: the control unit is used for controlling the trend of the heat source of the primary preheater and the heat storage medium at the outlet of the ORC evaporator according to the heat supply load.
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