WO2021039467A1 - Dispositif de production d'électricité à stockage par air comprimé - Google Patents

Dispositif de production d'électricité à stockage par air comprimé Download PDF

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Publication number
WO2021039467A1
WO2021039467A1 PCT/JP2020/030995 JP2020030995W WO2021039467A1 WO 2021039467 A1 WO2021039467 A1 WO 2021039467A1 JP 2020030995 W JP2020030995 W JP 2020030995W WO 2021039467 A1 WO2021039467 A1 WO 2021039467A1
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Prior art keywords
compression
expansion
compressed air
power generation
machine
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PCT/JP2020/030995
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English (en)
Japanese (ja)
Inventor
松隈　正樹
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株式会社神戸製鋼所
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Publication of WO2021039467A1 publication Critical patent/WO2021039467A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F02C1/04—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being heated indirectly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F02C6/14—Gas-turbine plants having means for storing energy, e.g. for meeting peak loads
    • F02C6/16—Gas-turbine plants having means for storing energy, e.g. for meeting peak loads for storing compressed air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/36—Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • 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

Definitions

  • the present invention relates to a compressed air storage power generation device.
  • CAES Compressed air energy storage
  • Patent Document 1 discloses a CAES power generation device that uses both a compressor and an expander.
  • Patent Document 1 does not mention a method of performing rated operation at a wide range of pressure regardless of whether charging operation or power generation operation is performed in a CAES power generation device using a compression / expansion combined machine.
  • CAES power generation equipment is required to have a wide range of rated operating capacity.
  • the efficiency of the charging operation is higher than the efficiency of the power generation operation (expansion operation), so that it is difficult to realize a wide range of rated operations.
  • the amount of power that can be generated from 1 kg of compressed air (specific power generation amount) is generally smaller than the amount of power required to generate 1 kg of compressed air (specific charge power amount) (hereinafter).
  • the specific charge electric energy or the specific power generation amount is also simply called the specific electric energy). Therefore, in order to realize the rated operation, it has been conventionally necessary to control the charging operation and the power generation operation separately.
  • the specific electric energy changes depending on the operating pressure (pressure of the stored compressed air), it is necessary to control according to the operating pressure in order to execute the rated operation at a wide range of pressures in the past. It was.
  • An object of the present invention is to realize rated operation in a wide range of pressures regardless of whether charging operation or power generation operation is performed in a compressed air storage power generation device using a compression / expansion combined machine.
  • the present invention A compression / expansion machine that has a function as a compressor that compresses air and a function as an expander that expands compressed air, A motor generator that is mechanically connected to the compression / expansion machine and has a function as an electric motor that drives the compression / expansion machine and a function as a generator that is driven by the compression / expansion machine. A pressure accumulator that is fluidly connected to the compression / expansion machine and stores compressed air generated by the compression / expansion machine.
  • a transmission unit provided between the compression / expansion combined machine and the motor generator combined machine and having a gear ratio R in the range of the following formula, Umax: Allowable maximum rotation speed (m / s) or piston allowable peripheral speed (m / s) of the compression / expansion combined machine Np: Number of poles of the motor generator D: Rotor outer diameter (m) or crank rotation diameter (m) of the compression / expansion machine Rmax: maximum gear ratio Provided is a compressed air storage power generation device.
  • the compression / expansion combined use is performed based on the allowable maximum rotation speed or piston allowable peripheral speed of the compression / expansion combined machine, the number of poles of the electric power generation combined machine, and the rotor diameter or crank rotation diameter of the compression / expansion combined machine.
  • the range of the power transmission ratio (gear ratio R) between the machine and the machine for electric power generation is specified.
  • the range of the gear ratio R is defined from the following two points that affect the specific electric energy. The first is the distinction between the charging operation and the power generation operation, and the second is the filling rate of the accumulator.
  • the compression / expansion machine in the power generation operation in which the motor generator functions as a generator, has the maximum rotation speed or the maximum peripheral speed of the piston when the filling rate of the pressure accumulator is 0%. It may be set to drive.
  • the compression / expansion combined machine is set to be driven at the maximum rotation speed or the maximum peripheral speed of the piston when the filling rate of the accumulator portion in the power generation operation is 0% and the specific power generation amount is the smallest. ..
  • the filling rate of 0% is the power generation limit value, that is, the state of the storage pressure in which the storage pressure in the accumulator is small and the power cannot be generated at a pressure lower than this, or the power generation is less than the allowable efficiency.
  • the power generation limit value that is, the state of the storage pressure in which the storage pressure in the accumulator is small and the power cannot be generated at a pressure lower than this, or the power generation is less than the allowable efficiency.
  • the maximum rotational speed or the maximum peripheral speed of the piston may be the maximum allowable rotational speed of the compression / expansion machine or the allowable peripheral speed of the piston.
  • the compressor / expansion machine in the charging operation in which the motor generator functions as an electric motor, the compressor / expansion machine is driven at the minimum rotation speed or the minimum peripheral speed of the piston when the filling rate of the pressure accumulator is 100%. It may be set to.
  • the compression / expansion combined machine is set to have the minimum rotation speed or the minimum peripheral speed of the piston when the filling rate of the accumulator portion in the charging operation is 100%.
  • the filling rate of 100% is the accumulator limit value, that is, the pressure in the accumulator portion has reached the maximum permissible pressure. Therefore, by setting the rotation speed of the compression / expansion combined machine to the minimum rotation speed or the minimum peripheral speed of the piston in this state, the rated charging power amount can be secured in a wide range.
  • the minimum rotational speed or the minimum peripheral speed of the piston may be 0.4 times or more the allowable maximum rotational speed of the compression / expansion combined machine or the allowable peripheral speed of the piston.
  • the minimum rotational speed or the minimum peripheral speed of the piston is set to 0.4 times or more the allowable maximum rotational speed of the piston.
  • the compression / expansion combined machine can be operated within the allowable operating temperature. Specifically, when the compressor / expansion machine operates as a compressor, some of the compressed air is discharged due to the pressure difference between the intake port (low pressure port) and the discharge port (high pressure port) of the compression / expansion machine. Backflow from the port) to the air intake (low pressure port). Since the flow rate of this backflowing air is almost constant regardless of the rotation speed of the rotor or the peripheral speed of the piston, the lower the rotation speed or the peripheral speed of the piston, the greater the ratio of the backflowing air to the air taken in from the atmosphere.
  • the internal temperature of the compression / expansion combined machine becomes higher as the rotation speed or the peripheral speed of the piston becomes lower, and the discharge temperature also rises. Therefore, in order to keep the internal temperature and the discharge temperature of the compression / expansion combined machine within the allowable operating temperature, it is necessary to keep the minimum rotation speed or the minimum peripheral speed of the piston at a certain level or higher. For example, such a minimum rotational speed or a minimum peripheral speed of a piston is 0.4 times or more an allowable maximum rotational speed or an allowable peripheral speed of a piston as described above.
  • the compression / expansion combined machine may be a screw type.
  • the amount of charging power and the amount of generated power can be adjusted by adjusting the rotation speed of the screw rotor, so that the required power (required charging power or generated power) that fluctuates irregularly can be followed with good responsiveness.
  • rated operation in a compressed air storage power generation device using a compression / expansion combined machine, rated operation can be realized with a wide range of pressure regardless of whether charging operation or power generation operation is performed.
  • the schematic block diagram of the CAES power generation apparatus which concerns on embodiment of this invention.
  • the graph which shows the specific electric energy with respect to the operating pressure of a CAES power generation apparatus.
  • the CAES power generation device 1 receives power from a power generation facility 2 that generates power using renewable energy, performs a charging operation, and performs a power generation operation according to the power demand. That is, the CAES power generation device 1 equalizes irregular output fluctuations of the power generation facility 2 and supplies power according to the power demand.
  • a wind power generation facility is illustrated as a power generation facility 2 that generates power using renewable energy.
  • the type of renewable energy targeted by the CAES power generation device 1 is not limited to this, and is constantly or repeatedly generated by natural forces such as sunlight, solar heat, wave power, tidal power, running water, or tidal power. It can cover all power generation using replenished and irregularly fluctuating energy.
  • renewable energy it can be applied to all factories whose power generation amount fluctuates, such as factories having power generation facilities that operate irregularly.
  • the CAES power generation device 1 includes a compression / expansion combined machine 10, an electric power generation combined machine 20, a pressure accumulator 30, and a control device 40.
  • the compression / expansion combined machine 10 has a function as a compressor for compressing air and a function as an expander for expanding compressed air. Further, the compression / expansion combined machine 10 has a low pressure port 11 and a high pressure port 12. When the compressor 10 functions as a compressor, the compression / expansion machine 10 takes in air from the low pressure port 11, compresses the air inside, and discharges the compressed air from the high pressure port 12. When the compression / expansion machine 10 functions as an expander, compressed air is supplied from the high pressure port 12, the compressed air is expanded inside, and air is exhausted from the low pressure port 11.
  • the compression / expansion combined machine 10 is a screw type. Since the screw type compression / expansion combined machine 10 can control the rotation speed of the internal screw rotor, it can responsively follow the required power (required charging power or generated power) that fluctuates irregularly. Therefore, the screw type compression / expansion combined machine 10 is preferable as a component of the CAES power generation device 1. Further, the compression / expansion combined machine 10 can be easily configured by using the screw rotor for both compression and expansion and rotating the screw rotors in opposite directions for compression and expansion. However, the compression / expansion combined machine 10 is not limited to the screw type, and may be a rotary type or a reciprocating type. The rotary type here includes all types such as a screw type, a centrifugal type, an axial flow type, or a scroll type. The reciprocating type includes all types such as a piston type or a diaphragm type.
  • the motor generator 20 is mechanically connected to the compression / expansion machine 10 via the transmission unit 21.
  • the electric power generation combined machine 20 has a function as an electric motor (motor) for operating the compression / expansion combined machine 10 as a compressor and a function as a generator driven by the compression / expansion combined machine 10 operating as an expander.
  • the power generation facility 2 is electrically connected to the motor generator 20.
  • the motor generator 20 functions as a motor generator and is driven by the fluctuating input power from the power generation facility 2.
  • the motor generator 20 is also electrically connected to a power system (not shown). In the power generation operation, the electric power generation combined machine 20 functions as a generator, and the generated output power is transmitted to the power system.
  • the operation of the motor generator 20 is controlled by the control device 40.
  • the inverter 22 is electrically connected to the motor generator 20.
  • the inverter 22 is controlled by the control device 40. Therefore, the control device 40 controls the rotation speed of the motor generator 20 by the inverter 22.
  • the transmission unit 21 changes the transmission ratio (gear ratio) of the rotational power between the compression / expansion combined machine 10 and the motor generator combined machine 20.
  • the transmission unit 21 is, for example, a transmission gear, and the gear ratio can be changed by engaging gears having different numbers of teeth.
  • the transmission unit 21 has a gear ratio R in the range of the following formula.
  • the screw type an example of the rotary type
  • the term “rotational speed” is used.
  • "rotation speed” should be read as "piston peripheral speed” and "rotor outer diameter” should be read as "crank rotation diameter”.
  • crank rotation diameter The description and formula of are applicable as well.
  • the maximum gear ratio Rmax is known in the art.
  • the minimum value of the gear ratio R is set to 0.7Rmax for the following reasons.
  • the gear ratio R at this time is 2.8 to 3.8, and the ratio of the minimum gear ratio (2.8) to the maximum gear ratio (3.8) is 0.7.
  • suitable operation can be realized by defining the gear ratio R to be 70% or more of the maximum gear ratio Rmax even in the case of other poles Np.
  • the pressure accumulator portion 30 is fluidly connected to the compression / expansion combined machine 10 via a three-way valve 31 and a check valve 32.
  • the pressure accumulator portion 30 is a portion that stores compressed air.
  • the accumulator 30 may be, for example, a steel tank.
  • the number of pressure accumulators 30 is not particularly limited, and a plurality of tanks may be provided.
  • the pressure accumulator 30 does not necessarily have to be in the form of a tank. Alternatively, it may be able to store compressed air, such as a closed underground cavity.
  • the three-way valve 31 may have a flow rate adjusting function.
  • a pressure sensor 33 is attached to the pressure accumulator 30.
  • the pressure sensor 33 can measure the pressure inside the accumulator 30. Therefore, the filling rate of the pressure accumulator 30 can be measured by the pressure sensor 33.
  • the measured pressure data is sent to the control device 40 and used for the control described later.
  • a heat exchanger 50 is interposed between the compression / expansion machine 10 and the accumulator 30.
  • a heat medium is supplied to the heat exchanger 50, and the heat exchanger 50 exchanges heat between the heat medium and air. Therefore, in the heat exchanger 50, air is heated or cooled by a heat medium as needed.
  • the heat exchanger 50 is fluidly connected to the high temperature heat medium tank 51 and the low temperature heat medium tank 52.
  • the high temperature heat medium tank 51 is a tank for storing a relatively high temperature heat medium
  • the low temperature heat medium tank 52 is a tank for storing a relatively low temperature heat medium.
  • the type of heat medium is not particularly limited, but may be, for example, water or oil.
  • a heat medium pump 53 is arranged in a heat medium flow path that fluidly connects the high temperature heat medium tank 51 and the low temperature heat medium tank 52 via the heat exchanger 50.
  • the heat medium pump 53 can supply a high temperature heat medium from the high temperature heat medium tank 51 to the heat exchanger 50, and can supply a low temperature heat medium from the low temperature heat medium tank 52 to the heat exchanger 50.
  • the flow rate of the heat medium supplied to the heat exchanger 50 by the heat medium pump 53 may be adjusted to adjust the amount of heat exchange.
  • the motor generator 20 When the CAES power generation device 1 performs the charging operation, the motor generator 20 is driven as an electric motor by the input power from the power generation facility 2. Rotational power is transmitted from the motor generator 20 driven as an electric motor to the compression / expansion machine 10 via the transmission unit 21, and the motor generator 10 drives the compression / expansion machine 10 as a compressor. Therefore, in the charging operation, the compression / expansion combined machine 10 uses electric power to take in air from the low-pressure port 11, compress the taken-in air, and discharge the compressed air from the high-pressure port 12. The discharged compressed air is stored in the accumulator 30.
  • the heat medium pump 53 supplies the low temperature heat medium from the low temperature heat medium tank 52 to the heat exchanger 50.
  • the heat exchanger 50 the low-temperature heat medium supplied from the low-temperature heat medium tank 52 and the high-temperature compressed air heated by the heat of compression exchange heat.
  • the compressed air is cooled and the heat medium is heated. Therefore, the compressed air is sent to the accumulator 30 and stored in a cooled and cooled state.
  • the heat medium is sent to and stored in the high temperature heat medium tank 51 in a state of being heated and heated.
  • compressed air is supplied from the accumulator unit 30 to the high pressure port 12 of the compression / expansion combined machine 10.
  • the compressed air supplied to the compressor drives the compression / expansion machine 10 as an expander, and the rotational power is transmitted from the compression / expansion machine 10 to the motor generator 20 via the transmission 21 and is electrically operated by the compression / expansion machine 10.
  • the generator 20 is driven as a generator. Therefore, in the power generation operation, compressed air is supplied from the accumulator 30 to the high pressure port 12, the compressed air is expanded in the compression / expansion combined machine 10, and the expanded air is exhausted from the low pressure port 11.
  • the heat medium pump 53 supplies the high temperature heat medium from the high temperature heat medium tank 51 to the heat exchanger 50.
  • the heat exchanger 50 the high-temperature heat medium supplied from the high-temperature heat medium tank 51 to the heat exchanger 50 and the compressed air supplied from the accumulator 30 exchange heat.
  • the compressed air is heated and the heat medium is cooled. Therefore, the compressed air is sent to the compression / expansion combined machine 10 in a state of being heated and heated, and is expanded.
  • the heat medium is sent to the low temperature heat medium tank 52 and stored in a cooled and cooled state.
  • FIG. 2 is a graph showing the amount of specific power with respect to the operating pressure of the CAES power generator.
  • the horizontal axis shows the operating pressure
  • the vertical axis shows the specific electric energy (specific electric energy or specific generated electric energy).
  • the pressure Pmin indicates the pressure when the filling rate of the accumulator 30 is 0%, that is, the lower limit of the pressure that air with a pressure lower than this value cannot generate electricity.
  • the pressure Pmax indicates the pressure when the filling rate of the accumulator 30 is 100%, that is, the upper limit of the pressure at which air having a pressure higher than this value cannot be stored.
  • a curve showing the specific electric energy SPC in the charging operation and a curve showing the specific electric energy SPG in the power generation operation are drawn.
  • the pressures P0, P1 and P2 indicate the pressure between the pressure Pmin and the pressure Pmax, and are the pressures increasing in this order (Pmin ⁇ P0 ⁇ P1 ⁇ P2 ⁇ Pmax).
  • the rotation speeds Rc4, Rc1, Rc2, and Rc3 of the compression / expansion combined machine 10 corresponding to the respective pressures Pmin, P1, P2, and Pmax in the charging operation are shown as subscripts, respectively.
  • the rotation speeds Rg1, Rg2, Rg3, and Rg4 of the compression / expansion combined machine 10 corresponding to the respective pressures Pmin, P1, P2, and Pmax in the power generation operation are shown as subscripts, respectively.
  • the specific electric energy required for the charging operation is the specific electric energy generated by the power generation operation. Higher than quantity.
  • the rotation speeds Rc1 to Rc4 of the compression / expansion combined machine 10 in the charging operation are set to be smaller than the rotation speeds Rg1 to Rg4 of the compression / expansion combined machine 10 in the power generation operation (Rc1 to Rc4 ⁇ Rg1 to Rg4). ..
  • the actual amount of charging power and the actual amount of generated power are made almost the same. Therefore, the same amount of charging power and the amount of generated power can be secured in the charging operation and the power generation operation, and the rated operation can be executed.
  • the specific electric power amount of the compression / expansion combined machine 10 changes according to the filling rate of the accumulator 30 (that is, the operating pressure on the horizontal axis of FIG. 2).
  • the rotation speed of the compression / expansion combined machine 10 is changed according to the storage pressure of the accumulator unit 30.
  • the rotation speeds Rc1, Rc2, and Rc3 when the operating pressures are P1, P2, and Pmax are set to decrease in this order (Rc1> Rc2> Rc3). That is, the rotation speed is set to decrease as the specific charge electric energy SPC increases.
  • the rotation speeds Rg1, Rg2, Rg3, Rg4 of the compression / expansion combined machine 10 when the operating pressures Pmin, P1, P2, Pmax (Pmin ⁇ P1 ⁇ P2 ⁇ Pmax) are reduced in this order.
  • Rg1> Rg2> Rg3> Rg4 is set to. That is, the rotation speed is set to decrease as the specific power generation amount SPG increases.
  • FIG. 2 shows a graph relating to a two-stage compression / expansion combined machine.
  • the specific charge electric energy SPC does not simply increase according to the operating pressure. That is, when the pressure is less than the pressure P0, the specific charging electric energy SPC increases as the operating pressure decreases. This indicates that the pressure P0 is the design discharge pressure of the low pressure stage. Therefore, the rotation speed Rc4 of the compression / expansion combined machine 10 at the pressure Pmin is set lower than the rotation speed Rc1 at the pressure P1 (Rc4 ⁇ Rc1).
  • the present invention is not limited to either the single-stage type or the multi-stage type.
  • the transmission unit 21 is in the above range (0). It is necessary to have a gear ratio R of .7 Rmax ⁇ R ⁇ Rmax). Thereby, the required rotation speeds Rg1 to Rg4 and Rc1 to Rc4 can be realized. That is, according to the present embodiment, the compression / expansion combined use is performed based on the allowable maximum rotation speed Umax of the compression / expansion combined machine 10, the number of poles Np of the electric power generation combined machine 20, and the rotor diameter D of the compression / expansion combined machine 10.
  • the range of the power transmission ratio (gear ratio R) between the machine 10 and the electric power generation machine 20 is defined.
  • the range of the gear ratio R is defined from the following two points that affect the specific electric energy. The first is the distinction between the charging operation and the power generation operation, and the second is the filling rate of the accumulator 30. In consideration of these, in order to secure the rated charging power amount and generated power amount in a wide range, it is necessary to change the rotation speed of the compression / expansion combined machine 10 in a wide range.
  • the rotation speed of the compression / expansion combined machine 10 can be changed in a wide range, and the rated charging power amount and the rated charging power amount in a wide range and The amount of generated power can be secured.
  • the conditions for the maximum rotation speed and the minimum rotation speed of the compression / expansion combined machine 10 are set as follows for the CAES power generation device 1 that performs the above operation operation.
  • the rotation speed Rg1 of the compression / expansion combined machine 10 when the filling rate of the accumulator 30 is 0% is set to be the maximum rotation speed. That is, when the specific power generation amount at which the filling rate of the accumulator is 0% is the smallest, the rotation speed of the compression / expansion combined machine 10 is set to the maximum rotation speed. As a result, as much generated power as possible can be secured.
  • the maximum rotation speed is set to be the allowable maximum rotation speed of the compression / expansion combined machine 10.
  • the maximum rotation speed of the compression / expansion combined machine 10 it is possible to operate by suitably utilizing the maximum allowable rotation speed of the compression / expansion combined machine 10, and it is possible to perform rated operation in a wide range of operating pressures (filling rate of the accumulator 30).
  • the minimum rotation speed is set so that the rotation speed of the compression / expansion combined machine 10 when the filling rate of the accumulator 30 is 100% (that is, when the pressure is Pmax) is the minimum rotation speed in the charging operation.
  • the rated charging electric energy can be secured in a wide range of operating pressures (filling rate of the accumulator 30).
  • the minimum rotation speed is set to be 0.4 times or more the allowable maximum rotation speed of the compression / expansion combined machine 10.
  • the compression / expansion combined machine 10 can be operated within the allowable operating temperature. Specifically, in the compression operation, the compressed air originally flows from the low pressure port 11 to the high pressure port, but due to the pressure difference between the low pressure port 11 and the high pressure port 12 of the compression / expansion combined machine 10, some of the compressed air becomes the high pressure port. Backflow from 12 to the low pressure port 11. Since the amount of backflow air is almost constant regardless of the rotation speed of the screw rotor, the smaller the rotation speed, the greater the ratio of the backflow air to the air taken in from the atmosphere.
  • the internal temperature of the compression / expansion combined machine 10 becomes higher as the rotation speed becomes smaller, and the discharge temperature also rises. Therefore, in order to keep the internal temperature and the discharge temperature of the compression / expansion combined machine 10 within the allowable operating temperature, it is necessary to keep the minimum rotation speed at a certain level or higher. For example, such a minimum rotation speed is 0.4 times or more the allowable maximum rotation speed.
  • rated operation can be realized in a wide range of pressures (Pmin to Pmax) regardless of whether charging operation or power generation operation is performed.
  • the filling rate of the pressure accumulator portion 30 is not limited to the one in which the pressure Pmin is set to 0% and the pressure Pmax is set to 100% as described in the above embodiment.
  • the pressure P1 may be set to about atmospheric pressure, and the filling rate may be set to 0% at the pressure P1.
  • any pressure P2 between pressures P1 and Pmax may be set to a filling factor of 100%.
  • CAES power generation device Compressed air storage power generation device
  • Power generation equipment Compression and expansion combined machine 11
  • Low pressure port High pressure port
  • Electric power generation combined machine Transmission unit 22
  • Inverter 30
  • Pressure storage unit 31
  • Three-way valve 32
  • Check valve 33
  • Pressure sensor 40
  • Heat exchanger 51
  • High temperature heat medium tank 52
  • Low temperature heat medium tank 53 Heat medium pump

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

L'invention concerne un dispositif (1) de production d'électricité à stockage de l'énergie par air comprimé (CAES), le dispositif comprenant un compresseur/détendeur combiné (10), un moteur électrique/générateur d'électricité combiné (20), une unité d'accumulation de pression (30) et une unité de transmission (21). Le compresseur/détendeur combiné (10) fonctionne en tant que compresseur et fonctionne aussi en tant que détendeur. Le moteur électrique/générateur d'électricité combiné (20) est relié mécaniquement au compresseur/détendeur combiné (10), et fonctionne en tant que moteur électrique destiné à entraîner le compresseur/détendeur combiné (10), et fonctionne aussi en tant que générateur d'électricité entraîné par le compresseur/détendeur combiné (10). L'unité d'accumulation de pression (30) est en communication fluidique avec le compresseur/détendeur combiné (10), et stocke de l'air comprimé produit par le compresseur/détendeur combiné (10). L'unité de transmission (21) est interposée entre le compresseur/détendeur combiné (10) et le moteur électrique/générateur d'électricité combiné (20), et présente un rapport de transmission R. Le rapport de transmission R satisfait à l'inéquation 0,7Rmax≤R≤Rmax, et Rmax=Umax∙Np/(120πD).
PCT/JP2020/030995 2019-08-28 2020-08-17 Dispositif de production d'électricité à stockage par air comprimé WO2021039467A1 (fr)

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JP2019155942A JP6862514B2 (ja) 2019-08-28 2019-08-28 圧縮空気貯蔵発電装置
JP2019-155942 2019-08-28

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WO2021039467A1 true WO2021039467A1 (fr) 2021-03-04

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Citations (2)

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JP2013509529A (ja) * 2009-10-28 2013-03-14 ゼネラル・エレクトリック・カンパニイ 圧縮器−膨張器可逆式ユニットを備える圧縮空気エネルギー貯蔵システム
JP2016220350A (ja) * 2015-05-18 2016-12-22 株式会社神戸製鋼所 圧縮空気貯蔵発電方法及び圧縮空気貯蔵発電装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013509529A (ja) * 2009-10-28 2013-03-14 ゼネラル・エレクトリック・カンパニイ 圧縮器−膨張器可逆式ユニットを備える圧縮空気エネルギー貯蔵システム
JP2016220350A (ja) * 2015-05-18 2016-12-22 株式会社神戸製鋼所 圧縮空気貯蔵発電方法及び圧縮空気貯蔵発電装置

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