JP2009114886A - Biogas power generation system and method for controlling biogas power generation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biogas power generation device and a method for controlling biogas power generation controlling start and stop of a gas engine by varying pressure for supplying biogas to the gas engine. <P>SOLUTION: A control device 18 compares biogas pressure V detected by a pressure detection device 13 with predetermined engine start pressure V1, engine drive maximum pressure V2, and engine drive minimum pressure V3, drives a gas engine generator 16 if the biogas pressure V gets to the engine start pressure V1 or higher, operates a surplus gas combustion device 17 if the biogas pressure V gets to the engine drive maximum pressure V2 or higher during drive of the gas engine generator 16, and stops the gas engine generator 16 and the surplus gas combustion device 17 if the biogas pressure V gets to the engine drive minimum pressure V3 or less. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technology for a biogas power generation system and a biogas power generation control method, and in particular, a bioengine that uses a biogas generated in a methane fermentation tank to drive a gas engine and generates power using a generator attached to the gas engine. The present invention relates to a technology of a gas power generation system and a control method of biogas power generation.

Conventionally, methane gas (methane in the gaseous state) is mainly produced by methane fermentation of organic waste, such as sewage sludge, organic waste water, food waste such as moss, and manure, using anaerobic bacteria. A biogas power generation system that generates a biogas that is a mixed gas as a component and uses the biogas in place of a hydrocarbon-based fossil fuel gas for power generation or the like is known (for example, Patent Documents) 1). Further, as an example of the biogas power generation system, a biogas power generation system that uses the biogas instead of hydrocarbon-based fossil fuel gas to drive a gas engine generator to generate power is known (for example, Patent Document 2 or Patent Document 3).
JP 2006-272160 A JP 2004-293465 A JP 2000-152799 A

However, the components of biogas obtained from methane fermentation include methane gas, carbon dioxide, siloxane (silicon compound), hydrogen sulfide, and oxygen that may be injected in the purification equipment. When used as fuel, it may adversely affect the human body or cause gas engine failure.
In addition, the supply of biogas by methane fermentation is not always constant, and the pressure of biogas supplied to the gas engine fluctuates due to fluctuations in the amount of generation, causing a failure of the gas engine.
In addition, methane gas with high environmental load may be emitted when surplus biogas is generated or when the gas engine generator is maintained.

  Therefore, in view of such problems, the present invention provides a biogas power generation apparatus and a biogas power generation control method capable of controlling the start and stop of the gas engine according to a change in pressure for supplying biogas to the gas engine. .

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  That is, in Claim 1, the methane fermentation tank which generates the biogas which has methane gas as a main component from organic waste, The refiner | purifier which isolate | separates and removes harmful gas from the biogas generated in the said methane fermentation tank, A continuous monitoring device that continuously checks the concentrations of harmful gases and oxygen, a pressure detection device that detects the pressure of the biogas, a gas storage device that stores the biogas generated from the methane fermenter, and A gas engine generator that burns biogas and air supplied from a gas storage device to drive a gas engine to drive a generator, and surplus gas combustion that burns surplus biogas to the gas engine generator The gas engine generator and the surplus gas combustion device can be started by inputting the device, the detection value of the pressure detection device, and the measurement value of the continuous monitoring device. A biogas power generation system comprising: a control device that controls stop; an engine start pressure, an engine drive maximum pressure, and an engine drive minimum pressure, in which the biogas pressure detected by the pressure detection device is preset by the control device; In comparison, when the biogas pressure is equal to or higher than the engine start pressure, the gas engine generator is driven, and when the gas engine generator is driven, the biogas pressure is equal to or higher than the engine drive maximum pressure. The surplus gas combustion device is operated in the event that the gas engine generator and surplus gas combustion device are stopped when the biogas pressure is below the engine drive minimum pressure. is there.

  In Claim 2, when the density | concentration of the harmful gas measured with the said continuous monitoring apparatus is more than a 1st setting density | concentration by the said control apparatus, or when the density | concentration of oxygen is more than a 2nd setting density | concentration, the said gas The engine generator and the surplus gas combustion device are controlled to be stopped.

  In Claim 3, the methane fermentation tank which generates the biogas which has methane gas as a main component from organic waste, the refiner | purifier which isolate | separates and removes harmful gas from the biogas generated in the said methane fermentation tank, A continuous monitoring device for continuously confirming concentrations of gases and oxygen, a pressure detection device for detecting the pressure of the biogas, a gas storage device for storing biogas generated from the methane fermentation tank, and the gas storage A gas engine generator that burns biogas and air supplied from the apparatus, drives a gas engine to drive a generator, and a surplus gas combustion apparatus that burns surplus biogas to the gas engine generator; The detection value of the pressure detection device and the measurement value of the continuous monitoring device are input to start and stop the gas engine generator and the surplus gas combustion device. Those comprising a control device for controlling.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, the gas engine generator can be driven only when biogas capable of driving the gas engine generator is generated. In addition, if more biogas than is required when the gas engine is driven is supplied, the methane gas in the surplus biogas is burned by the surplus gas combustion device. Can be prevented.

  According to the second aspect of the present invention, by mixing oxygen into the biogas, the possibility of explosion due to the mixture of methane gas and oxygen in the biogas power generation system is prevented. Further, when the concentration of harmful gas in the biogas is high, it prevents the harmful gas from flowing into the gas engine generator, prevents the gas engine generator from being broken, and To prevent methane gas from being discharged.

  In claim 3, the gas engine generator can be driven only when biogas capable of driving the gas engine generator is generated. In addition, if more biogas is supplied than is necessary when the gas engine is driven, methane gas in the biogas is burned by the surplus gas combustion device, so that methane gas with a high environmental load must be discharged into the air. Can be prevented.

Next, embodiments of the invention will be described.
FIG. 1 is a block diagram showing an overall configuration of a biogas power generation system according to an embodiment of the present invention, FIG. 2 is a block diagram of a control device, and FIG. 3 is a start / stop control of a gas engine generator by pressure. It is a flowchart figure of the ignition control of a surplus gas combustion apparatus. FIG. 4 is a flowchart of the start / stop control of the gas engine generator and the ignition control of the surplus gas combustion device by pressure, and FIG. 5 is the start / stop control of the gas engine generator and the ignition control of the surplus gas combustion device by continuous monitoring. It is a flowchart figure.

First, the biogas power generation system 1 according to the present invention will be described.
As shown in FIG. 1, a biogas power generation system 1 includes a methane fermentation tank 11 that generates a biogas that is a mixed gas mainly composed of methane gas from organic waste, and a biogas generated in the methane fermentation tank 11. A purification device 12 for separating and removing harmful gases, a continuous monitoring device 14 for measuring the concentrations of harmful gases and oxygen to continuously check the concentrations of harmful gases and oxygen, and the biogas A pressure detection device 13 for detecting pressure, a gas storage device 15 for storing the biogas, and methane gas contained in the biogas supplied from the gas storage device 15 is combusted to drive the gas engine 41 to generate power. When the gas engine generator 16 for driving the machine 42 and biogas more than necessary for driving the gas engine generator 16 are supplied, The surplus gas combustion device 17 for combusting the methane gas in the biogas, the detection value of the pressure detection device 13 and the measurement value of the continuous monitoring device 14 are input to start the gas engine generator 16 and the surplus gas combustion device 17 And a control device 18 for controlling the stop.

<Methane fermentation tank>
The said methane fermenter 11 throws in organic wastes, such as food factory wastewater, and performs methane fermentation, and produces | generates biogas. As an example of the methane fermenter 11, a cell granule having the characteristics of maintaining a high concentration of granulated methane-fermenting bacteria with a high sedimentation rate and treating effluent with high-efficiency methane fermentation is used. There is a fermenter using a wastewater treatment method, for example, UASB (Upflow Anaerobic Sludge Blanket) method. Biogas, which is a mixed gas containing methane gas generated from the methane fermentation tank 11, is sent to the purification device 12 through the pipe 21.
The pipe 21 is provided with a manual valve 23. When both the gas engine generator 16 and the surplus gas combustion device 17 are stopped, the manual valve 23 is closed to close the pipe 21 from the methane fermentation tank 11. It is possible to stop the supply of biogas.

<Purification equipment>
In the purification apparatus 12, hydrogen sulfide is removed from the biogas by the action of a catalyst or adsorption, and siloxane (silicon compound) is removed. By removing siloxane from the biogas, it is possible to prevent the siloxane from solidifying inside the gas engine 41 of the gas engine generator 16.

<Gas storage device>
A gas storage device 15 serving as a pressure accumulating means communicates with the pipe 22 communicating with the purification device 12. The gas storage device 15 is made of, for example, a gas-impermeable material that swells greatly when the pressure of the biogas is increased and is slightly deflated when the pressure of the biogas is decreased. The gas storage device 15 is formed in a spherical shape or a cylindrical shape, has a double structure, and is filled with a pressure adjusting gas at a constant pressure between an outer bag and an inner bag. When the pressure of the biogas is higher than the pressure of the regulated gas, the gas storage device 15 swells and stores the biogas. On the other hand, by driving the gas engine generator 16 or the like, When the gas becomes smaller, the gas storage device 15 is deflated and the biogas stored in the pipe 22 is supplied from the gas storage device 15. However, this configuration is not limited, and a configuration in which the inside of a container that can accommodate a necessary amount of gas is partitioned by an elastic film may be employed.

<Gas engine generator>
A gas engine generator 16 is communicated with the purification device 12 via a pipe 22. An electromagnetic valve 44 is interposed between the purification device 12 of the pipe 22 and the gas engine generator 16, and between the gas storage device 15 and the gas engine generator 16, and the solenoid 44a of the electromagnetic valve 44 is controlled by the control. A device 18 is connected.
In the gas engine generator 16, the gas engine 41 and the generator 42 are directly connected, and power is generated by rotating the magnet or coil of the generator 42 by the rotation of the output shaft of the gas engine 41. Is possible. The gas engine 41 is provided with a start / stop device 43 and is connected to the control device 18. The control device 18 sends a signal to the solenoid 44 a to open the electromagnetic valve 44 when the value detected by the pressure detection device 13 is equal to or higher than the first set value, and starts the gas engine 41 by the start / stop device 43. When the value is equal to or lower than the second set value, the electromagnetic valve 44 is closed and the gas engine 41 is also stopped. The first set value is higher than the second set value.

<Excess gas combustion device>
In addition, a surplus gas combustion device 17 is communicated with the purification device 12 via a pipe 22. An electromagnetic valve 52 is interposed between the purification device 12 of the pipe 22 and the surplus gas combustion device 17, and a solenoid 52 a of the electromagnetic valve 52 is connected to the control device 18. The surplus gas combustion device 17 generates carbon dioxide and water by burning methane gas contained in surplus biogas more than necessary when the gas engine 41 is driven, and does not give a load to the environment. It is a device for discharging. In addition, when the gas engine generator 16 is stopped, carbon dioxide and water are generated by preventing the pressure in the pipe 22 from increasing excessively and by burning methane gas, thereby giving a load to the environment. This is a device for discharging biogas.

  The surplus gas combustion device 17 is provided with an ignition device 51 and connected to the control device 18. The ignition device 51 sends a signal to the solenoid 52a to open the solenoid valve 52 when the detected value by the pressure detection device 13 is equal to or higher than a set value (engine drive maximum pressure V2), and activates the ignition device 51 to remove excess gas. Burn. Moreover, when it becomes below a setting value (engine drive minimum pressure V3), it has the structure which sends a signal to the solenoid 52a, closes the solenoid valve 52, and stops the surplus gas combustion apparatus 17. FIG. The engine driving maximum pressure V2 is higher than the engine driving minimum pressure V3. The engine drive maximum pressure V2 and the engine drive minimum pressure V3 are stored in the storage means of the control device 18, and each setting value can be changed by the setting operation means.

Further, a pressure detection device that measures the pressure V of the biogas in the pipe 22 is provided in the middle of the pipe 22 that communicates with the purification device 12, the gas storage device 15, the gas engine generator 16, and the surplus gas combustion device 17. 13 is provided. The pressure detection device 13 inputs the detected pressure V to the control device 18.
A continuous monitoring device 14 is provided in the middle of the pipe 22 communicating with the purification device 12, the gas storage device 15, the gas engine generator 16, and the surplus gas combustion device 17. Wherein the continuous monitoring device 14 continuously monitors the biogas which has been purified by the purification unit 12, and measures the concentration C _{H2 S} which is a harmful substance hydrogen sulfide (H 2 _S). The continuous monitoring device 14 measures the concentration C _O2 of oxygen (O ₂ ) contained in the biogas. The continuous monitoring device 14 inputs the detected hydrogen sulfide concentration _{CH 2 S} and oxygen concentration _{CO 2} to the control device 18. The controller 18 also stops the gas engine generator 16 when the hydrogen sulfide concentration and oxygen concentration are equal to or higher than the set values, and drives the gas engine generator 16 when the hydrogen sulfide concentration and oxygen concentration are equal to or lower than the set values.

<Control device>
Next, the control device 18 will be described.
As shown in FIG. 2, the control device 18 is connected to the pressure detection device 13 and the continuous monitoring device 14 on the input side, and on the output side, the start / stop device 43 of the gas engine generator 16 and the surplus gas combustion device 17. The ignition device 51 is connected.

<Control means>
Next, the flow of control by the control device 18 will be described based on the flowcharts of FIGS.
First, start / stop control of the gas engine generator 16 by the biogas pressure V and ignition control of the surplus gas combustion device 17 will be described.
When the automatic operation mode is selected, first, as shown in FIG. 3, it is determined whether or not the biogas pressure V in the pipe 22 is equal to or higher than the engine starting pressure V1 that is the first set value (step). S10). If the biogas pressure V is less than the engine start pressure V1, the biogas pressure V is subsequently detected by the pressure detector 13 and step S10 is processed. If the biogas pressure V is equal to or higher than the engine start pressure V1, it is determined that there is sufficient pressure to drive the gas engine generator 16, and a signal is sent to the solenoid 44a to open the solenoid valve 44. Then, the start / stop device 43 of the gas engine generator 16 is turned “ON” to start the gas engine generator 16 (step S20).

  Next, it is determined whether or not the pressure V is equal to or higher than the engine drive maximum pressure V2 when the gas engine generator 16 is started (step S30). Here, in the present invention, when the pressure V is not less than the engine start pressure V1 and less than the engine drive maximum pressure V2, it is determined that the methane gas in the biogas is completely burned by the gas engine generator 16, When the engine drive maximum pressure V2 or higher is reached, complete combustion cannot be performed. Therefore, a signal is sent to the solenoid 52a to open the solenoid valve 52, and the ignition device 51 of the surplus gas combustion device 17 is turned “ON”. Is started (step S40).

  When the biogas pressure V is less than the engine drive maximum pressure V2 or when the surplus gas combustion device 17 is started in step S40, the biogas pressure V detected by the pressure detection device 13 is It is determined whether or not the engine driving minimum pressure V3 is greater (step S50). When the biogas pressure V is not less than the engine drive minimum pressure V3, it is determined that the pressure capable of driving the gas engine generator 16 can be continued, and the pressure detector 13 continues to detect the biogas pressure V. Is detected, and the process of step S30 is performed. On the other hand, when the pressure V is equal to or lower than the engine drive minimum pressure V3, it is determined that the pressure required for driving the gas engine generator 16 is not supplied, and a signal is sent to the solenoid 44a to close the solenoid valve 44. The gas engine generator 16 and the surplus gas combustion device 17 are stopped by turning off the start / stop device 43 of the gas engine generator 16 and sending a signal to the solenoid 52a to close the solenoid valve 52 (step S60). ). And after the said gas engine generator 16 and the surplus gas combustion apparatus 17 stop, it returns to step S10 and performs control by the pressure V of biogas again.

  With this configuration, if the biogas pressure V exceeds the gas engine starting pressure V1 required for driving the gas engine generator 16, a signal is sent to the solenoid 44a to open the solenoid valve 44, and the gas engine If the gas engine generator 16 is started by turning on the start / stop device 43 of the generator 16 and the biogas pressure V exceeds the gas engine drive maximum pressure V2 of the gas engine generator 16, the gas It is determined that gas larger than the methane gas in the biogas necessary for driving the engine generator 16 is generated, a signal is sent to the solenoid 52a, the electromagnetic valve 52 is opened, and the ignition device of the surplus gas combustion device 17 By starting the surplus gas combustion device 17 with 51 being “ON”, it is possible to prevent the pressure of the biogas in the pipe 22 from being excessively increased.In addition, the surplus gas combustion device 17 burns methane gas to generate carbon dioxide and water, thereby reducing the methane gas, which is a greenhouse gas, and suppressing the environmental load.

  When the pressure of the biogas is equal to or lower than the gas engine drive minimum pressure V3 of the gas engine generator 16, a signal is sent to the solenoid 44a to close the solenoid valve 44, and the start / stop device 43 of the gas engine generator 16 is closed. Is turned “OFF”, a signal is sent to the solenoid 52a, the electromagnetic valve 52 is closed, and the gas engine generator 16 and the surplus gas combustion device 17 are stopped. In this way, it is possible to prevent a desired voltage from being obtained or a voltage fluctuation from occurring due to insufficient rotation of the gas engine generator 16.

Next, ignition control of the surplus gas combustion device 17 when the gas engine generator 16 is stopped due to maintenance or the like will be described.
Even when the gas engine generator 16 is stopped due to maintenance, since the biogas is continuously generated from the methane fermentation tank 11, the pressure in the pipe 22 is excessively increased. In this case, if the generated methane gas is discharged out of the biogas power generation system 1 as it is, the methane gas is a greenhouse gas, which places an impact on the environment. Therefore, it is necessary to combust methane gas generated from the methane fermentation tank 11 to generate carbon dioxide and water with relatively low environmental load.

  As shown in FIG. 4, it is determined whether or not the biogas pressure V is equal to or higher than a specified pressure V4 (step S110). If the biogas pressure V is less than the specified pressure V4, the biogas pressure V is subsequently detected by the pressure detection device 13, and step S110 is looped. On the other hand, when the biogas pressure V is equal to or higher than the specified pressure V4, the ignition device 51 of the surplus gas combustion device 17 is set to “ "ON" and the surplus gas combustion device 17 is started (step S120).

  Next, when the surplus gas combustion device 17 is started, it is determined whether or not the pressure V is equal to or lower than a specified pressure V5 (step S130). If the pressure V is not less than or equal to the specified pressure V5, the pressure V is continuously detected and the loop process of step S130 is performed. On the other hand, when the pressure of the biogas is equal to or lower than the specified pressure V5, it is determined that there is almost no biogas in the pipe 22, and a signal is sent to the solenoid 52a to close the solenoid valve 52, thereby making the surplus gas combustion device 17 Is stopped (step S140). After the surplus gas combustion device 17 is stopped, the process returns to step S110 and the control by the biogas pressure V is performed again.

  By performing such control, the methane gas in the biogas is combusted and discharged by the surplus gas combustion device 17, thereby changing the methane gas, which is a greenhouse gas, to carbon dioxide or water, and then the biogas power generation system 1 It becomes possible to discharge outside, and it becomes possible to reduce environmental load.

Next, control by the continuous monitoring device 14 will be described.
The control by the continuous monitoring device 14 monitors the hydrogen sulfide concentration C _{H 2 S} and the oxygen concentration C _{O 2} measured by the continuous monitoring device 14, and based on the measured values, the gas engine generator 16 and the surplus gas combustion device 17. Emergency stop. The control is performed only in the automatic operation mode with pressure control.

First, as shown in FIG. 5, it is determined by the continuous monitoring device 14 whether or not the hydrogen sulfide concentration C _H2S and the oxygen concentration C _O2 are equal to or higher than the first set concentration C1 or the second set concentration C2. S210). If the hydrogen sulfide concentration _CH2S is less than the first set concentration C1 and the oxygen concentration _CO2 is less than the second set concentration C2, monitoring is continuously performed by the continuous monitoring device 14, and the loop process of step S210 is performed. I do. On the other hand, if the hydrogen sulfide concentration _CH2S is not less than the first set concentration C1 or the oxygen concentration _CO2 is not less than the second set concentration C2, a signal is sent to the solenoid 44a of the gas engine generator 16 to close the solenoid valve 44. Then, the start / stop device 43 is turned “OFF”, the gas engine generator 16 is stopped, a signal is sent to the solenoid 52a, and the solenoid valve 52 is closed, thereby stopping the surplus gas combustion device 17 (step S220).

  By configuring in this way, even if any problem occurs in the purification apparatus 12, it is possible to prevent the biogas in which harmful hydrogen sulfide remains in the human body from being discharged, and the hydrogen sulfide is a gas. It becomes possible to prevent inflow into the engine generator 16. Further, by stopping the biogas power generation system 1 when oxygen is mixed, the possibility of explosion due to mixing of methane gas and oxygen is prevented. Further, the reaction between oxygen and hydrogen sulfide in the purifier 12 is prevented from generating heat.

  Further, the manual valve 23 is closed when maintenance of the refining device 12, the pressure detection device 13, the continuous monitoring device 14, and the surplus gas combustion device 17 is performed.

As mentioned above, the control method of the biogas power generation concerning this invention is harmful gas from the methane fermentation tank 11 which generates the biogas which has methane gas as a main component from organic waste, and the biogas generated in the said methane fermentation tank 11 Purification device 12 that separates and removes, continuous monitoring device 14 that continuously measures whether harmful gases and oxygen are removed, pressure detection device 13 that detects the pressure of the biogas, and methane fermentation A gas storage device 15 for storing biogas generated from the tank 11, and a gas engine for driving the generator 42 by driving the gas engine 41 by burning the biogas and air supplied from the gas storage device 15 The generator 16, the surplus gas combustion device 17 that combusts surplus biogas to the gas engine generator 16, and the pressure detection device 13. In the biogas power generation system 1 including the control unit 18 that controls the start and stop of the gas engine generator 16 and the surplus gas combustion device 17 by inputting the output value and the measurement value of the continuous monitoring device 14, the control The device 18 compares the biogas pressure V detected by the pressure detection device 13 with the preset engine start pressure V1, engine drive maximum pressure V2, and engine drive minimum pressure V3. The gas engine generator 16 is driven when the starting pressure V1 or higher, and the surplus gas is driven when the biogas pressure V exceeds the engine driving maximum pressure V2 when the gas engine generator 16 is driven. When the combustion device 17 is operated and the gas engine generator 16 is driven, the surplus gas combustion device 17 is operated. When the pressure V of the biogas is below the engine driving the lowest pressure V3 if that is to stop the gas engine generator 16 and the excess gas combustion device 17, and controls so.
With this configuration, the gas engine generator 16 can be driven only when biogas that can drive the gas engine generator 16 is generated. In addition, when more biogas than necessary when the gas engine 41 is driven is supplied, the methane gas in the biogas is combusted by the surplus gas combustion device 17, so that methane gas with high environmental load is discharged into the air. Can be prevented.

Further, when the control device 18 has a harmful gas concentration _CH2S measured by the continuous monitoring device 14 equal to or higher than the first set concentration C1, or when the oxygen concentration _CO2 is equal to or higher than the second set concentration C2. In the control, the gas engine generator 16 and the surplus gas combustion device 17 are stopped.
By comprising in this way, when oxygen mixes in biogas, the possibility of the explosion by mixing of methane gas and oxygen in the said biogas power generation system 1 is prevented. Further, when the concentration of harmful gas in the biogas is high, it prevents the harmful gas from flowing into the gas engine generator 16, prevents the gas engine generator 16 from being broken, and the biogas. Preventing the emission of methane gas outside the power generation system 1.

1 is a block diagram showing an overall configuration of a biogas power generation system according to an embodiment of the present invention. The block diagram of a control apparatus. The flowchart figure of the start / stop control of the gas engine generator by the pressure, and the ignition control of the surplus gas combustion device. The flowchart figure of the start / stop control of the gas engine generator by the pressure and the ignition control of the surplus gas combustion device. The flowchart figure of the start / stop control of the gas engine generator by continuous monitoring, and the ignition control of the surplus gas combustion apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Biogas power generation system 11 Methane fermentation tank 12 Purification apparatus 13 Pressure detection apparatus 14 Continuous monitoring apparatus 15 Gas storage apparatus 16 Gas engine generator 17 Surplus gas combustion apparatus 18 Control apparatus 41 Gas engine 42 Generator

Claims (3)

A methane fermentation tank that generates biogas mainly composed of methane gas from organic waste,
A purification device for separating and removing harmful gases from the biogas generated in the methane fermentation tank;
A continuous monitoring device that continuously checks the concentration of harmful gases and oxygen;
A pressure detection device for detecting the pressure of the biogas;
A gas storage device for storing biogas generated from the methane fermentation tank;
A gas engine generator that burns biogas and air supplied from the gas storage device to drive a gas engine to drive a generator;
A surplus gas combustion device for combusting surplus biogas to the gas engine generator;
A control device for controlling the start and stop of the gas engine generator and the surplus gas combustion device by inputting the detection value of the pressure detection device and the measurement value of the continuous monitoring device;
In a biogas power generation system comprising:
By the control device,
The biogas pressure detected by the pressure detection device is collated with a preset engine start pressure, engine drive maximum pressure, engine drive minimum pressure,
When the biogas pressure is equal to or higher than the engine starting pressure, the gas engine generator is driven,
When the gas engine generator is driven, if the pressure of the biogas is equal to or higher than the engine drive maximum pressure, the surplus gas combustion device is operated,
If the biogas pressure is below the engine drive minimum pressure, stop the gas engine generator and surplus gas combustion device,
The control method of biogas power generation characterized by controlling as follows. By the control device,
When the harmful gas concentration measured by the continuous monitoring device is equal to or higher than the first set concentration, or when the oxygen concentration is equal to or higher than the second set concentration, the gas engine generator and the surplus gas combustion device are stopped. ,
The biogas power generation control method according to claim 1, wherein the control is performed as follows. A methane fermentation tank that generates biogas mainly composed of methane gas from organic waste,
A purification device for separating and removing harmful gases from the biogas generated in the methane fermentation tank;
A continuous monitoring device that continuously checks the concentration of harmful gases and oxygen;
A pressure detection device for detecting the pressure of the biogas;
A gas storage device for storing biogas generated from the methane fermentation tank;
A gas engine generator that burns biogas and air supplied from the gas storage device to drive a gas engine to drive a generator;
A surplus gas combustion device for combusting surplus biogas to the gas engine generator;
A control device for controlling the start and stop of the gas engine generator and the surplus gas combustion device by inputting the detection value of the pressure detection device and the measurement value of the continuous monitoring device;
Comprising
A biogas power generation system characterized by that.

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