JP2019152117A - Energy supply system - Google Patents

Abstract

To provide an energy supply system which reduces cost by suppressing use of commercial power in a compressed air use facility.SOLUTION: An energy supply system 1 is configured to alternatively or additionally supply to a compressed air use facility 10 compressed air separate from air generated therein. The energy supply system comprises: a power generation facility 2 which is provided independently of the compressed air use facility 10, generates power by utilizing renewable energy and generates separate compressed air by using generated power; a compressed air supply line 3 which connects the power generation facility 2 and the compressed air use facility 10, for supplying the separate compressed air to the compressed air use facility 10; and a switching device 4 which is configured to open/close the compressed air supply line 3 and capable of switching the compressed air supply line between an open state in which the compressed air supply line 3 is alternatively or additionally opened and the separate compressed air is supplied to the compressed air use facility 10 and a closed state in which the compressed air supply line 3 is closed and the supply of the separate compressed air to the compressed air use facility 10 is stopped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an energy supply system using renewable energy.

  As a method of treating sewage such as sewage or industrial wastewater, a method of decomposing organic matter using activated sludge (microorganisms) in the sewage is known. In the water treatment system using activated sludge, an aeration tank for activating activated sludge by supplying air (oxygen) to the sewage is widely used in order to improve the treatment efficiency of sewage (for example, Patent Document 1).

JP 11-138191 A

  In general, air is supplied to the aeration tank by generating electric power by driving an electric motor with a commercial AC power source, generating compressed air using the electric power, and generating the compressed air from the bottom of the aeration tank This is done by injecting into However, such a method requires a large amount of commercial power, particularly in a large-scale water treatment system that requires a large amount of compressed air, such as a sewage treatment plant, which leads to a large cost increase.

  Therefore, an object of the present invention is to provide an energy supply system that suppresses the use of commercial power in a compressed air use facility and realizes cost reduction.

  The energy supply system according to the first aspect of the present invention supplies, to a compressed air use facility that generates and uses compressed air, alternatively or additionally, compressed air other than that generated by the compressed air use facility. An energy supply system that is provided independently of the facility using compressed air, generates power using renewable energy, and generates another compressed air using the generated power; and It is configured to connect the power generation equipment and equipment using compressed air and supply another compressed air to equipment using compressed air, and to open and close the compressed air supply line, and open the compressed air supply line. In addition, the compressed air supply line is closed or the supply of another compressed air to the facility using the compressed air is shut off, and the supply of the compressed air to the facility using the compressed air is stopped. That has a switching device that can switch to a closed state, the.

  In addition, the energy supply system according to the second aspect of the present invention is provided independently of the compressed air using facility for the compressed air using facility that generates and uses the compressed air, and uses renewable energy. An energy supply system that generates power and supplies another compressed air alternatively or additionally from a power generation facility that uses the generated power to generate compressed air other than that generated by the facility using compressed air The power generation facility and the compressed air use facility are connected to each other, the compressed air supply line for supplying another compressed air to the compressed air use facility, and the compressed air supply line are opened and closed. An open state in which the supply line is opened and another compressed air is supplied to the compressed air use facility alternatively or additionally, and the compressed air supply line is closed and another compressed air is used. The supply of and a, a switching device that can switch to a closed state to stop.

  Moreover, the energy supply system according to the third aspect of the present invention is an energy supply system that alternatively supplies power other than commercial power to a facility using compressed air that uses commercial power to generate compressed air. In addition, the power generation facility that is provided independently of the compressed air use facility and generates power using renewable energy, and the power generation facility and the compressed air use facility are connected to compress the power generated by the power generation facility. A power supply line for supplying to the air-using facility, and a closed state configured to open and close the power supply line, closing the power supply line, and alternatively supplying the generated power to the compressed-air using facility; And a switching device that can be switched to an open state in which the power supply line is opened and the supply of the generated power to the facility using compressed air is stopped.

  Moreover, the energy supply system by the 4th aspect of this invention is provided independently of the compressed air use installation with respect to the compressed air use installation which uses commercial electric power in order to produce | generate compressed air, and is renewable energy. Is an energy supply system that supplies power generated by a power generation facility as power separate from commercial power from a power generation facility that generates power by using the power generation facility by connecting the power generation facility and a facility that uses compressed air. The power supply line for supplying the power generated by the facility to the facility using compressed air and the power supply line are configured to open and close, the power supply line is closed, and the generated power is replaced by the facility using compressed air And a switching device that can be switched between a closed state for supplying power and an open state for opening the power supply line and stopping the supply of generated power to the compressed air use facility. That.

  According to such an energy supply system, if necessary, the compressed air generated by using the power from the renewable energy is supplied to the facility using compressed air, or the power is generated as power for generating the compressed air. Can be supplied to equipment using compressed air. As a result, it is possible to reduce the amount of commercial power used to generate compressed air in the compressed air use facility.

  As described above, according to the present invention, it is possible to reduce the cost by suppressing the use of commercial power in the facility using compressed air.

1 is a schematic configuration diagram of an energy supply system according to a first embodiment of the present invention. It is the schematic which shows the structural example of the compressed air use equipment which concerns on the 1st Embodiment of this invention. It is a schematic block diagram of the energy supply system which concerns on the 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the present specification, the energy supply system of the present invention will be described by taking as an example a case where it is applied to an aeration facility in a sewage treatment plant where a large amount of compressed air is used, but it is also suitable for other compressed air using facilities. Can be applied to. Examples of such equipment using compressed air include aeration equipment for dams, oxygen supply equipment for farms, air lift pumps such as underground water storage tanks, air supply equipment for thermal power plants and garbage incineration plants.

(First embodiment)
With reference to FIG. 1, the energy supply system which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a schematic configuration diagram of an energy supply system according to the present embodiment.

  The energy supply system 1 of the present embodiment generates compressed air by using electric power generated by renewable energy (for example, electric power generated by a wind power generator), and the compressed air is a facility that uses compressed air. The power generation equipment 2, the compressed air supply line 3, the valve device 4, and the control device 5 are supplied to the power supply 10.

  The power generation facility 2 is provided at a location independent of the aeration facility 10, for example, a location several kilometers away from the aeration facility 2, and includes a wind power generation device 21, a power distribution device 22, a compressor 23, and an air tank 24. And. The wind power generator 21 generates power using wind power, and is connected to an external power transmission system 20 and a compressor 23 via a power distribution device 22. The electric power generated by the wind power generator 21 is normally supplied to the power transmission system 20 and supplied to the compressor 23 when surplus power is generated. However, the reverse may be sufficient and it is usually supplied to the compressor 23 and may be supplied to the power transmission system 20 when surplus power is generated. The compressor 23 generates compressed air when supplied with power via the power distribution device 22, and the generated compressed air is stored in the air tank 24. The air tank 24 is provided with a pressure gauge 25 that measures the pressure in the air tank 24.

  The compressed air supply line 3 is provided to connect the air tank 24 of the power generation facility 2 and the aeration facility 10 and supply the compressed air generated by the power generation facility 2 to the aeration facility 10. Instead of or in addition to the pressure gauge 25 provided in the air tank 24, a pressure gauge may be provided in the compressed air supply line 3.

  The valve device (switching device) 4 is provided at a position where the compressed air supply line 3 is connected to the aeration equipment 10, and is configured to open and close the compressed air supply line 3. The valve device 4 is in an open state in which the compressed air supply line 3 is opened to supply compressed air to the aeration facility 10, and a closed state in which the compressed air supply line 3 is closed to stop the supply of compressed air to the aeration facility 10. And can be switched to. This switching is performed based on the measurement value by the pressure gauge 25 as will be described later.

  The control device 5 controls the operation of the energy supply system 1, in particular, switching between the open state and the closed state of the valve device 4. Specifically, when the control device 5 receives a request signal for compressed air from the aeration facility 10, the measured value of the pressure gauge 25 (or a pressure gauge provided in the compressed air supply line 3) is equal to or greater than a predetermined lower limit value. It is determined whether or not. The lower limit here is a minimum pressure value at which the amount of compressed air required by the aeration equipment 10 can be supplied through the compressed air supply line 3.

  Therefore, when it is determined that the measured value of the pressure gauge 25 is equal to or higher than the lower limit value, the valve device 4 is switched to the open state, the compressed air supply line 3 is opened, and the aeration equipment 10 is supplied from the air tank 24 of the power generation equipment 2. Is supplied with compressed air. Note that when the valve device 4 is in the open state, depending on the state of generation of surplus power in the wind power generator 21, the compressed air in the air tank 24 may be consumed, and the measured value of the pressure gauge 25 may fall below the lower limit value. is there. In that case, the valve device 4 is switched to the closed state. When the valve device 4 is switched to the closed state, a blower (not shown in FIG. 1) installed in the aeration equipment 10 is driven by a commercial AC power supply (commercial power supply) and is consumed by the aeration equipment 10. It is designed to generate air. On the other hand, when the control device 5 receives the compressed air request signal from the aeration equipment 10 and determines that the measured value of the pressure gauge 25 is less than the predetermined value, the valve device 4 is switched to the open state. Rather, it remains closed. Also in this case, a necessary amount of compressed air is generated by the blower in the aeration apparatus 10.

  Here, with reference to FIG. 2, the structural example of the aeration equipment to which the energy supply system of this embodiment is applied is demonstrated. FIG. 2 is a schematic diagram illustrating a configuration example of the aeration facility according to the present embodiment.

  The aeration facility 10 is provided with an aeration tank 11 that is a device using compressed air, and a blower 12 that supplies compressed air to the aeration tank 11. The aeration tank 11 is provided with an air diffuser 14 that is connected to the discharge side of the blower 12 via an air pipe 13 and discharges compressed air into the sewage in the aeration tank 11. The blower 12 is connected to, for example, an electric motor driven by a commercial power source, and is configured to generate compressed air by compressing outside air with commercial power.

  The compressed air supply line 3 branches into two and is connected to the aeration equipment 10 respectively. That is, the first branch line 3 a is connected to the air diffuser 14 in the aeration tank 11 via the air pipe 13, and the second branch line 3 b is connected to the suction side of the blower 12. The first branch line 3a and the second branch line 3b are respectively provided with a first opening / closing valve 4a and a second opening / closing valve 4b constituting the valve device 4.

  In such a configuration example, when it is determined that the measured value of the pressure gauge 25 is less than the predetermined lower limit value, both the first on-off valve 4a and the second on-off valve 4b are closed, but the lower limit value or more is reached. Is determined, it is further determined whether or not the measured value of the pressure gauge 25 is greater than or equal to a predetermined upper limit value. The upper limit value here is a minimum pressure value at which the amount of compressed air required for the aeration process in the aeration layer 11 can be supplied through the compressed air supply line 3. When it is determined that the measurement value of the pressure gauge 25 is equal to or higher than the upper limit value, the first opening / closing valve 4a is opened and the second opening / closing valve 4b is closed simultaneously, and the compressed air from the power generation facility 2 is The air is supplied from the first branch line 3 a to the air diffuser 14 in the aeration tank 11 through the air pipe 13. In this case, since it is not necessary to drive the blower 12 provided in the aeration equipment 10, commercial power is not consumed. On the other hand, when it is determined that the measured value of the pressure gauge 25 is less than the predetermined upper limit value, the first on-off valve 4a is closed and the second on-off valve 4b is opened at the same time. The compressed air is supplied as intake air to the blower 12 through the second branch line 3b. For this reason, compared with the case where the supply of compressed air from the power generation facility 2 is not received as intake air, the blower 12 can be driven with a small amount of electric power to generate compressed air.

  The compressed air supply line 3 does not necessarily have to be branched into two and connected to the aeration equipment 10, and one of the first branch line 3a and the second branch line 3b may be omitted. . That is, the second branch line 3 b is omitted and the compressed air supply line 3 is connected only to the aeration tank 11, or the first branch line 3 a is omitted and the compressed air supply line 3 is connected only to the blower 12. It may be connected.

  As mentioned above, according to the energy supply system of this embodiment, the compressed air produced | generated using the electric power by renewable energy (wind power) can be supplied to an aeration equipment as needed, and commercial electric power in an aeration equipment The amount of use can be reduced. Moreover, in the energy supply system of this embodiment, since the electric power by renewable energy is converted into the energy for generating compressed air, it is not reconverted into electric power. Energy can be consumed stably. By these, the system which reduces the usage-amount of the commercial power in the sewage treatment plant which is a national measure, and the system which consumes the electric power excessively generated by the renewable energy can be provided. In addition, the energy supply system of the present embodiment is advantageous in that the number of components can be reduced as compared with other power storage systems that use surplus power of renewable energy.

  Note that the power generation facility using renewable energy may be newly installed or may be an existing one. Moreover, as renewable energy to utilize, it is not limited to wind power, Other renewable energy, such as sunlight, hydropower, and biomass, may be sufficient.

(Second Embodiment)
With reference to FIG. 3, the energy supply system which concerns on the 2nd Embodiment of this invention is demonstrated. FIG. 3 is a schematic configuration diagram of the energy supply system of the present embodiment. Hereinafter, with respect to the same configuration as the above-described embodiment, the same reference numerals are given to the drawings, the description thereof is omitted, and only the configuration different from the first embodiment is described.

  The energy supply system 1 according to the present embodiment alternatively supplies power from renewable energy (as an example, power generated by a wind power generator) to the aeration facility 10 instead of commercial power for generating compressed air. The power generation facility 2, the power supply line 6, the switch device 7, and the control device 5 are configured. That is, this embodiment is different from the first embodiment in that the power generated by the power generation facility 2 is supplied to the aeration facility 10 as it is. Therefore, in this embodiment, the power generation facility 2 does not include the compressor 23 and the air tank 24, and instead of the compressed air supply line 3 and the valve device 4 of the first embodiment, the power supply line 6 and the switch A device 7 is provided.

  The power supply line 6 is provided to connect the power generation facility 2 and the aeration facility 10 and supply the power generated by the power generation facility 2 to the aeration facility 10. Specifically, the power supply line 6 is connected to the aeration equipment 10 via a commercial power supply line 9 that connects the commercial power supply 8 and the aeration equipment 10. The commercial power line 9 is provided to supply commercial power to the blower 12 (see FIG. 2) of the aeration facility 10.

  The switch device (switching device) 7 has a first open / close switch 7 a for opening and closing the power supply line 6, and closes the power supply line 6 to supply power generated by the power generation facility 2 to the aeration facility 10. It is configured to be switchable between a state and an open state in which the power supply line 6 is opened to stop the supply of power generated by the power generation facility 2 to the aeration facility 10. Furthermore, the switch device 7 has a second opening / closing switch 7b that opens / closes the commercial power supply line 9 in conjunction with opening / closing of the power supply line 6. The second open / close switch 7b closes the power supply line 6 at the same time as the first open / close switch 7a closes the commercial power line 9 to stop the supply of commercial power to the aeration equipment 10, and the first open / close switch 7b 7 a opens the power supply line 6 and simultaneously closes the commercial power supply line 9 to supply commercial power to the aeration equipment 10.

  Switching between the open state and the closed state of the switch device 7 is performed by the control device 5 based on the power generation amount of the power generation facility 2 (wind power generation device 21). Specifically, when the control device 5 receives the compressed air request signal from the aeration equipment 10, whether or not the power generation amount of the wind power generation device 21 is equal to or greater than a predetermined amount, that is, the surplus power is generated in the wind power generation device 21. It is determined whether or not it has occurred. In addition, the electric power generation amount of the wind power generator 21 is measured by the watt-hour meter (not shown) provided in the power generation equipment 2, for example.

  When it is determined that the power generation amount of the wind turbine generator 21 is equal to or greater than a predetermined amount and surplus power is generated, the first opening / closing switch 7b is opened and the second opening / closing switch 7b is opened simultaneously. . In this way, surplus power generated in the wind power generator 21 is supplied from the power distribution device 22 to the aeration equipment 10 through the power supply line 6, and the blower 12 is driven by the surplus power to generate a necessary amount of compressed air. The On the other hand, if it is determined that the amount of power generated by the wind turbine generator 21 is less than the predetermined amount and no surplus power is generated, the first opening / closing switch 7a is opened and the second opening / closing switch 7b is closed simultaneously. Is done. Thus, commercial power is supplied from the commercial power supply 8 to the aeration equipment 10 through the commercial power supply line 9, and the blower 12 is driven by the commercial power to generate a necessary amount of compressed air. Even when the switch device 7 is in the closed state, the presence or absence of surplus power in the wind turbine generator 21 is monitored, and if it is determined that surplus power is not generated, the switch device 7 is changed from the open state to the closed state. Can be switched.

  As described above, according to the energy supply system of the present embodiment, as the electric power for generating the compressed air, the electric power from the renewable energy (wind power) can be supplied to the aeration equipment as necessary. Electricity consumption can be reduced. Moreover, in the energy supply system of this embodiment, since the electric power by renewable energy is consumed directly as electric power for generating compressed air, there is little energy loss and it can consume renewable energy stably. . The energy supply system of the present embodiment is also advantageous in that the number of components can be reduced compared to other power storage systems that use surplus power of renewable energy.

  Also in this embodiment, the power generation facility using renewable energy may be newly installed or may be an existing one. Moreover, as renewable energy to utilize, it is not limited to wind power, Other renewable energy, such as sunlight, hydropower, and biomass, may be sufficient.

DESCRIPTION OF SYMBOLS 1 Energy supply system 2 Power generation equipment 3 Compressed air supply line 3a 1st branch line 3b 2nd branch line 4 Valve apparatus (switching apparatus)
4a 1st on-off valve 4b 2nd on-off valve 5 Control device 6 Electric power supply line 7 Switch device (switching device)
7a First open / close switch 7b Second open / close switch 8 Commercial power supply 9 Commercial power supply line 10 Aeration equipment 11 Aeration tank 12 Blower 13 Air piping 14 Aeration device 21 Wind power generation device 22 Power distribution device 23 Compressor 24 Air tank 25 Pressure Total

Claims (11)

An energy supply system that alternatively or additionally supplies compressed air other than that generated by the compressed air using facility to the compressed air using facility that generates and uses the compressed air,
A power generation facility that is provided independently of the compressed air use facility, generates power using renewable energy, and generates the other compressed air using the generated power; and
A compressed air supply line for connecting the power generation facility and the compressed air use facility and supplying the other compressed air to the compressed air use facility;
An open state configured to open and close the compressed air supply line, open the compressed air supply line, and supply the other compressed air to the compressed air use facility alternatively or additionally, and the compressed air supply A switching device that can be switched to a closed state that closes a line and stops the supply of the other compressed air to the facility using compressed air;
Having an energy supply system. Compressed air using equipment that generates and uses compressed air is provided independently of the compressed air using equipment, generates power using renewable energy, and uses the generated power to An energy supply system that alternatively or additionally supplies the other compressed air from a power generation facility that generates compressed air different from that generated by the facility using compressed air,
A compressed air supply line for connecting the power generation facility and the compressed air use facility and supplying the other compressed air to the compressed air use facility;
An open state configured to open and close the compressed air supply line, open the compressed air supply line, and supply the other compressed air to the compressed air use facility alternatively or additionally, and the compressed air supply A switching device that can be switched to a closed state that closes a line and stops the supply of the other compressed air to the facility using compressed air;
Having an energy supply system. The compressed air use facility has a compressed air use device and a blower for supplying compressed air to the compressed air use device,
The energy supply system according to claim 1 or 2, wherein the compressed air supply line is connected to the compressed air using device. The compressed air use facility has a compressed air use device and a blower for supplying compressed air to the compressed air use device,
The compressed air supply line has a first branch line connected to the compressed air use device and a second branch line connected to the suction side of the blower;
The switching device opens one of the first branch line and the second branch line and closes the other when in the open state, and closes the other when in the closed state. The energy supply system according to claim 1, wherein the energy supply system is configured to close both a line and the second branch line.   5. The switch according to claim 1, wherein the open state and the closed state of the switching device are switched based on a pressure value in an air tank provided in the power generation facility and storing the other compressed air. The energy supply system described.   The energy supply system according to any one of claims 1 to 5, wherein the compressed air use facility is an aeration facility. An energy supply system that alternatively supplies power other than the commercial power to a facility that uses compressed air where commercial power is used to generate compressed air,
A power generation facility that is provided independently of the compressed air use facility and generates power using renewable energy; and
A power supply line for connecting the power generation facility and the compressed air use facility, and supplying the power generated by the power generation facility to the compressed air use facility;
The power supply line is configured to open and close, the power supply line is closed, the closed state in which the generated power is alternatively supplied to the compressed air use facility, the power supply line is opened, and A switching device that can be switched to an open state in which the supply of generated power to the compressed air using facility is stopped;
Having an energy supply system. With respect to the compressed air use facility in which commercial power is used to generate compressed air, the commercial power is provided from a power generation facility that is provided independently of the compressed air use facility and generates power using renewable energy. An energy supply system that alternatively supplies power generated by the power generation facility as power different from
A power supply line for connecting the power generation facility and the compressed air use facility, and supplying the power generated by the power generation facility to the compressed air use facility;
The power supply line is configured to open and close, the power supply line is closed, the closed state in which the generated power is alternatively supplied to the compressed air use facility, the power supply line is opened, and A switching device that can be switched to an open state in which the supply of generated power to the compressed air using facility is stopped;
Having an energy supply system. A commercial power line for supplying the commercial power to the compressed air using facility is connected to the compressed air using facility,
The switching device is configured to open and close the commercial power line, and when in the closed state, opens the commercial power line, stops supplying the commercial power to the compressed air use facility, The energy supply system according to claim 7 or 8, wherein when in an open state, the commercial power supply line is closed and the commercial power is supplied to the compressed air use facility.   The energy supply system according to any one of claims 7 to 9, wherein the open state and the closed state of the switching device are switched based on a power generation amount of the power generation facility.   The energy supply system according to any one of claims 7 to 10, wherein the compressed air use facility is an aeration facility.

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