JP2019196764A - Fuel supply control device, gas engine, control method of gas engine, and program - Google Patents

Abstract

To surely stop fuel supply in a short time.SOLUTION: A fuel supply control device 20 of a gas engine 1 includes a first fuel cut-off processing portion, and a second fuel cut-off processing portion. The first fuel cut-off processing portion brings only a main solenoid valve 41 and an auxiliary solenoid valve 44 in which at least one valve device 40 is disposed at a downstream side among a plurality of valve devices 40, into a cut-off state in a first state when it is necessary to stop supply of a fuel gas. The second fuel cut-off processing portion brings both of a main control valve 43 and an auxiliary chamber pressure difference control valve 46 disposed at a most downstream side of the plurality of valve devices 40, and the main solenoid valve 41 and the auxiliary solenoid valve 44, into the cut-off state in a second state when it is necessary to stop the supply of the fuel gas in a shorter time in comparison with the first state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel supply control device, a gas engine, a gas engine control method, and a program.

  The gas engine uses gas (fuel gas) such as CNG (Compressed natural gas) or LPG (Liquefied petroleum gas) as fuel. The fuel gas is supplied to the gas engine through the gas pipe. The gas pipe is provided with a valve device capable of blocking the gas flow path in the gas pipe. By shutting off the gas flow path with the valve device, the supply of fuel gas to the gas engine is stopped, and the gas engine is stopped.

  Patent Document 1 discloses a configuration in which, in such a gas engine, a shutoff valve and an electric valve are provided in a gas pipe (fuel gas line) for supplying fuel gas to the gas engine. According to such a configuration, the gas pipe can be closed by the electric valve having higher sealing performance than the shut-off valve. Therefore, the sealing performance when the gas pipe is closed is improved.

JP 2017-155723 A

By the way, in the gas engine as described in Patent Document 1, when the gas engine is stopped, the fuel gas remaining in the gas piping on the downstream side of the valve device, the shutoff valve, and the electric valve is transferred to the gas engine. It flows and burns. However, in an emergency or the like, it may be desired to stop the gas engine more reliably in a shorter time.
The present invention has been made in view of the above circumstances, and provides a fuel supply control device, a gas engine, a gas engine control method, and a program capable of reliably stopping fuel supply in a shorter time. Objective.

The present invention employs the following means in order to solve the above problems.
According to the first aspect of the present invention, the fuel supply control device is provided with a gas pipe for supplying fuel gas and a gas flow path in the gas pipe provided at intervals in the flow direction of the fuel gas. A plurality of possible valve devices. The fuel supply control device includes a first fuel cutoff processing unit and a second fuel cutoff processing unit. The first fuel shut-off processing unit is a first valve in which at least one valve device is arranged on the downstream side of the plurality of valve devices in the first state where the supply of the fuel gas needs to be stopped. Only shut down the device. The second fuel shut-off processing unit includes the first valve device and the plurality of valve devices in the second state where the supply of the fuel gas needs to be stopped in a shorter time than the first state. Both the second valve device arranged on the most downstream side is brought into a shut-off state.

  In the first aspect, in the first state where it is necessary to stop the supply of the fuel gas, only the first valve device is shut off by the first fuel shut-off processing unit. In the second state where the supply of the fuel gas needs to be stopped in a shorter time than the first state, the second fuel shutoff processing unit causes the first valve device and the plurality of valve devices to be Both the second valve device disposed downstream is brought into a shut-off state. In this way, in addition to the first valve device, the second valve device arranged at the most downstream is in a shut-off state, so that the first valve device and the second valve device are put in a shut-off state, and then in the gas pipe It is possible to suppress the remaining fuel gas from being supplied to the gas engine. Accordingly, it is possible to reliably stop the fuel supply in a shorter time.

According to the second aspect of the present invention, the first valve device according to the first aspect is an electromagnetic valve capable of on / off control of the supply of the fuel gas, and the second valve device is configured to supply the fuel gas. You may make it be a control valve which can adjust supply_amount | feed_rate.
With this configuration, in the second state where the supply of fuel gas needs to be stopped in a shorter time than in the first state, the second fuel shutoff processing unit causes the most of the plurality of valve devices. A control valve arranged downstream can be closed. Since such a control valve is excellent in responsiveness compared with an electromagnetic valve, it becomes possible to stop fuel supply reliably in a shorter time.

According to the third aspect of the present invention, the second state according to the first or second aspect may be a state in which misfire has occurred simultaneously in a plurality of cylinders of the gas engine.
By comprising in this way, when misfire occurs simultaneously in the several cylinder of a gas engine, supply of fuel gas can be stopped in a shorter time.

According to the fourth aspect of the present invention, the second state according to any one of the first to third aspects may be a state in which the output of the gas engine is rapidly reduced.
By comprising in this way, when the output of a gas engine falls rapidly, supply of fuel gas can be stopped in a shorter time.

According to the fifth aspect of the present invention, the second state according to any one of the first to fourth aspects is a state in which an ignition device for igniting the mixture of the fuel gas and the air has failed. You may do it.
By comprising in this way, when an ignition device fails, supply of fuel gas can be stopped in a shorter time.

According to a sixth aspect of the present invention, a gas engine includes a fuel supply control device according to any one of the first to fifth aspects, an engine main body to which the fuel gas is supplied by the fuel supply control device, .
By comprising in this way, when it is a 2nd state which needs to stop supply of fuel gas in a short time rather than a 1st state, in addition to a 1st valve apparatus, the 2nd most arrange | positioned downstream By setting the valve device to the shut-off state, it is possible to suppress the fuel gas remaining in the gas pipe from being supplied to the engine body. Accordingly, it is possible to reliably stop the fuel supply in a shorter time.

According to the seventh aspect of the present invention, the engine body according to any one of the first to sixth aspects includes a main chamber and a sub chamber. The gas pipe includes a main chamber gas pipe that supplies fuel gas to the main chamber and a sub chamber gas pipe that supplies fuel gas to the sub chamber. The second valve device includes a main chamber second valve device provided in the main chamber gas pipe and a sub chamber second valve device provided in the sub chamber gas pipe.
With such a configuration, in the sub-chamber type gas engine, in the second state that needs to be stopped in a shorter time than the first state, the main chamber gas pipe for supplying fuel gas to the main chamber is The chamber is shut off by the chamber second valve device. Further, in the second state, the sub chamber gas pipe for supplying the fuel gas to the sub chamber is shut off by the sub chamber second valve device. In this way, the supply of fuel gas to both the main chamber and the sub chamber can be stopped in a shorter time.

  According to an eighth aspect of the present invention, there is provided a gas engine control method comprising: a gas pipe for supplying fuel gas; and a gas flow path in the gas pipe provided at intervals in a direction in which the fuel gas flows. A plurality of valve devices capable of being shut off. In the control method of the gas engine, in the first state where it is necessary to stop the supply of the fuel gas, the first valve device in which at least one valve device is arranged on the downstream side among the plurality of valve devices. The first valve device and the plurality of valves in the first fuel shut-off process step for shutting off only the fuel and the second state in which the supply of the fuel gas needs to be stopped in a shorter time than the first state And a second fuel shut-off process step for shutting off both of the second valve devices disposed on the most downstream side of the device.

  In the eighth aspect, in the second state in which the supply of the fuel gas needs to be stopped in a shorter time than the first state, the first valve device and the first valve device and the second valve device arranged at the most downstream position among the plurality of valve devices. Turn off both the two-valve device. In this way, in addition to the first valve device, the second valve device arranged at the most downstream is shut off to suppress the fuel gas remaining in the gas pipe from being supplied to the gas engine. it can. Accordingly, it is possible to reliably stop the fuel supply in a shorter time.

  According to the ninth aspect of the present invention, the program causes the computer of the fuel supply control device that controls the supply of fuel gas to function. In this program, in the first state where it is necessary to stop the supply of the fuel gas to the computer, at least one valve device is arranged on the downstream side of the plurality of valve devices of the fuel supply control device. In the case of a second state where it is necessary to stop the supply of the fuel gas in a shorter time than the first state, and the processing step of shutting off only the first valve device being And a processing step of shutting off both of the second valve device disposed on the most downstream side of the valve device.

  In the ninth aspect, in the second state where the supply of the fuel gas needs to be stopped in a shorter time than the first state, the first valve device and the plurality of valve devices are arranged on the most downstream side. Both the second valve device and the second valve device are shut off. In this way, in addition to the first valve device, the second valve device arranged at the most downstream is shut off to suppress the fuel gas remaining in the gas pipe from being supplied to the gas engine. it can. Accordingly, it is possible to reliably stop the fuel supply in a shorter time.

  According to the fuel supply control device, the gas engine, the gas engine control method, and the program, the fuel supply can be reliably stopped in a shorter time.

It is a mimetic diagram showing the whole gas engine composition in one embodiment of this invention. It is a block diagram which shows the functional structure of the controller of the said gas engine. It is a flowchart which shows the flow of a process of the control method of the gas engine in one Embodiment of this invention.

Hereinafter, a fuel supply control device, a gas engine, a gas engine control method, and a program according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the overall configuration of the gas engine of this embodiment. FIG. 2 is a block diagram showing a functional configuration of the controller of the gas engine. FIG. 3 is a flowchart showing a process flow of the control method of the gas engine in this embodiment.
As shown in FIG. 1, the gas engine 1 of this embodiment includes an engine body 10 and a fuel supply control device 20. The gas engine 1 constitutes a part of a cogeneration system, for example. The gas engine 1 drives, for example, a generator (not shown) that constitutes a cogeneration system.

  The engine body 10 includes a main chamber 11 and a sub chamber 12. The engine body 10 sucks air-fuel mixture into the main chamber 11 and the sub chamber 12 from the fuel supply control device 20. The engine body 10 sucks into the sub chamber 12 a sub chamber mixture having a higher fuel concentration relative to the air than the main chamber 11. The engine body 10 sucks into the main chamber 11 a main chamber mixture having a lower fuel concentration relative to the air than the sub chamber 12. The engine body 10 ignites the air-fuel mixture in the sub chamber 12 with the ignition device 16 to generate a flame. The engine body 10 burns the air-fuel mixture in the main chamber 11 with the flame generated in the sub chamber 12. The combustion of the air-fuel mixture in the main chamber 11 and the sub chamber 12 causes the output shaft 13 of the engine body 10 to rotate. The output shaft 13 rotationally drives a driving object such as a generator (not shown). The engine body 10 also includes an exhaust part 15. The exhaust unit 15 discharges the exhaust gas generated when the air-fuel mixture burns in the main chamber 11 and the sub chamber 12 to the outside.

  In this embodiment, the gas engine 1 includes a plurality of sets of cylinders 14 including a main chamber 11 and a sub chamber 12 in one engine body 10. Further, the gas engine 1 may include a plurality of cylinders 14 by including a plurality of engine bodies 10 each including the main chamber 11 and the sub chamber 12 described above.

  The fuel supply control device 20 includes a main chamber gas line (gas piping, main chamber gas piping) 31, a sub chamber gas line (gas piping, sub chamber gas piping) 32, a main chamber mixture generation apparatus 33, a plurality of A valve device 40 and a controller (computer) 50 are mainly provided.

  The main chamber gas line 31 supplies air-fuel mixture to the main chamber 11. The main chamber gas line 31 includes a plurality of valve devices 40 at intervals in the direction in which the fuel gas flows. Specifically, the main chamber gas line 31 includes, as a part of the plurality of valve devices 40, a main electromagnetic valve (first valve device) 41, a main pressure regulator 42, and a main control valve (second valve device). , Main chamber second valve device) 43. The operations of the main solenoid valve 41, the main pressure regulator 42, and the main control valve 43 are controlled by the controller 50.

  The main solenoid valve 41 is disposed in the uppermost stream in the direction of the fuel gas in the gas flow path R <b> 1 among the plurality of valve devices 40 provided in the main chamber gas line 31. The main solenoid valve 41 can block the gas flow path R1 in the main chamber gas line 31. In other words, the main electromagnetic valve 41 can shut off the gas flow path R1 and stop the supply of the fuel gas sent from the fuel supply source (not shown). That is, the main solenoid valve 41 can control on / off of the supply of fuel gas in the main chamber gas line 31.

  The main pressure regulator 42 is provided in the main chamber gas line 31 downstream of the main electromagnetic valve 41 in the direction of fuel gas flow in the gas flow path R1. The main pressure regulator 42 adjusts the pressure of the fuel gas flowing through the gas flow path R1 to be equal to or lower than a predetermined upper limit set value.

  The main control valve 43 is provided in the main chamber gas line 31 downstream of the main electromagnetic valve 41 and the main pressure regulator 42 in the flow direction of the fuel gas in the gas flow path R1. That is, the main control valve 43 is disposed at the most downstream in the flow direction of the fuel gas in the gas flow path R <b> 1 among the plurality of valve devices 40 provided in the main chamber gas line 31. The main control valve 43 adjusts the flow rate of the fuel gas in the gas flow path R <b> 1 in the main chamber gas line 31. In this embodiment, for example, a butterfly control valve can be used as the main control valve 43.

  The sub chamber gas line 32 supplies fuel gas to the sub chamber 12. The sub chamber gas line 32 branches off from the main chamber gas line 31. Specifically, the sub chamber gas line 32 is branched from an intermediate portion between the main solenoid valve 41 and the main pressure regulator 42. The sub chamber gas line 32 illustrated in this embodiment includes a gas compressor 47 and a gas cooler. 48 is provided. The gas compressor 47 pressurizes the fuel gas branched from the gas flow path R1 of the main chamber gas line 31 and flowing into the gas flow path R2. The gas cooler 48 cools the fuel gas pressurized by the gas compressor 47.

  The sub chamber gas line 32 is provided with a plurality of valve devices 40 at intervals from the gas compressor 47 and the gas cooler 48 on the downstream side in the flow direction of the fuel gas in the gas flow path R2. The sub chamber gas line 32 includes, as a plurality of valve devices 40, a sub electromagnetic valve (first valve device) 44, a sub pressure regulator 45, and a sub chamber differential pressure control valve (second valve device, sub chamber second valve device). 46). The operations of the sub electromagnetic valve 44, the sub pressure regulator 45, and the sub chamber differential pressure control valve 46 are controlled by the controller 50.

  The sub electromagnetic valve 44 is disposed in the uppermost stream in the direction in which the fuel gas flows in the gas flow path R <b> 2 among the plurality of valve devices 40 provided in the sub chamber gas line 32. The auxiliary electromagnetic valve 44 is supplied with fuel gas that has passed through a gas compressor 47 and a gas cooler 48. The sub electromagnetic valve 44 can block the gas flow path R <b> 2 in the sub chamber gas line 32. In other words, the sub electromagnetic valve 44 can shut off the gas flow path R2 and stop the supply of the fuel gas sent from the fuel supply source (not shown). That is, the sub electromagnetic valve 44 can be controlled to turn on / off the supply of fuel gas in the sub chamber gas line 32.

  The sub pressure regulator 45 is provided in the sub chamber gas line 32 on the downstream side of the sub electromagnetic valve 44 in the flow direction of the fuel gas in the gas flow path R2. The sub pressure regulator 45 adjusts the pressure of the fuel gas flowing through the gas flow path R2 to be equal to or lower than a predetermined upper limit set value.

  The sub chamber differential pressure control valve 46 is provided in the sub chamber gas line 32 downstream of the sub electromagnetic valve 44 and the sub pressure regulator 45 in the flow direction of the fuel gas in the gas flow path R2. That is, the sub chamber differential pressure control valve 46 is disposed at the most downstream of the plurality of valve devices 40 provided in the sub chamber gas line 32 in the flow direction of the fuel gas in the gas flow path R2. The sub chamber differential pressure control valve 46 adjusts the flow rate of the fuel gas in the gas flow path R <b> 2 in the sub chamber gas line 32. In this embodiment, the sub-chamber differential pressure control valve 46 may be a solenoid type control valve, for example.

  The main chamber mixture generator 33 is provided between the main chamber gas line 31 and the main chamber 11 of the engine body 10. The main chamber mixture generation device 33 includes an air cleaner 34 and a venturi mixer 35. The air cleaner 34 filters air taken from outside. The venturi mixer 35 mixes the fuel gas supplied from the main chamber gas line 31 and the air that has passed through the air cleaner 34 to generate a main chamber mixture. An air cooler 36 is provided on the downstream side of the main chamber air-fuel mixture generator 33. The air cooler 36 cools the main chamber mixture generated by the venturi mixer 35. The main chamber mixture cooled by the air cooler 36 is supplied to the main chamber 11.

  In this embodiment, the main chamber mixture generation apparatus 33 includes a supercharger 38. The supercharger 38 includes a turbine 38a, a main shaft 38b, and a compressor 38c. The turbine 38 a is rotationally driven by the flow of exhaust gas discharged from the engine body 10 to the exhaust unit 15. The main shaft 38b connects the turbine 38a and the compressor 38c. The compressor 38c rotates integrally with the turbine 38a via the main shaft 38b. The compressor 38 c compresses the main chamber mixture supplied from the venturi mixer 35 to the air cooler 36.

  The controller 50 is a so-called ECU (Engine Control Unit) including a calculation device such as a CPU (Central Processing Unit) that performs various calculations and a circuit board (not shown) on which a storage device such as a memory is mounted. . The controller 50 executes a calculation program stored in advance in a storage device (not shown) such as a nonvolatile memory. The controller 50 performs various calculations based on command information output from a system controller (not shown) that controls the entire cogeneration system including the gas engine 1. The controller 50 of this embodiment executes a calculation program for automatically controlling the supply of fuel gas to the gas engine 1 in the fuel supply control device 20 and the operation of other gas engines 1.

  The controller 50 receives command information output from a system controller (not shown) that controls the entire cogeneration system including the gas engine 1 at predetermined time intervals. A system controller (not shown) monitors the operating state of each part of the cogeneration system including the gas engine 1. When a system controller (not shown) determines that it is necessary to stop the operation of the engine body 10 based on the monitoring results of each part, the engine body in the fuel supply control device 20 with respect to the controller 50 of the gas engine 1. The supply of fuel gas to 10 is stopped.

  As shown in FIG. 2, the controller 50 includes a state determination processing unit 51, a first fuel cutoff processing unit 52, a second fuel cutoff processing unit 53, as functional units realized by executing the calculation program. It has. Both the first fuel cutoff processing unit 52 and the second fuel cutoff processing unit 53 control the operation of the fuel supply control device 20 so as to stop the operation of the engine main body 10, thereby supplying the fuel gas to the engine main body 10. Stop supplying.

  The state determination processing unit 51 determines whether or not it is necessary to stop the supply of fuel gas to the engine body 10 based on command information output from a system controller (not shown) that controls the entire cogeneration system. To do. When it is necessary to stop the supply of the fuel gas to the engine body 10, the state determination processing unit 51 is in the first state in which the supply of the fuel gas needs to be normally stopped or the supply of the fuel gas in the first state It is determined whether it is the second state that requires an emergency stop in a shorter time.

  Here, as the first state, for example, when the engine body 10 is in a normal operation state, the operation of the engine body 10 is normally stopped based on command information from a system controller (not shown) of the cogeneration system. There is a case. In addition to this, when the operation of the engine body 10 is stopped in a state other than the second state described below, the first state is assumed in this embodiment.

  As the second state, for example, a state in which misfiring has occurred at the same time in a plurality of cylinders 14 of the gas engine 1 (engine body 10), a state in which the output of the gas engine 1 (engine body 10) has suddenly decreased, fuel gas and air The ignition device for igniting the air-fuel mixture with the engine has failed. The engine body 10 in this embodiment includes a sensor (not shown) that detects whether or not misfiring has occurred in each cylinder 14 and a sensor (not shown) that detects the output of the engine body 10 (the rotational speed of the output shaft 13). ) And a sensor (not shown) for detecting the operation of the ignition device 16. A system controller (not shown) determines whether the state is the second state based on detection signals from these sensors (not shown). When it is determined that the system controller (not shown) is in the second state, it outputs command information indicating the second state to the controller 50.

  The first fuel cutoff processing unit 52 needs to stop the supply of the fuel gas based on the determination result of the state determination processing unit 51, and only the main electromagnetic valve 41 and the sub electromagnetic valve 44 in the first state. Is turned off. When the gas flow path R1 of the main chamber gas line 31 is blocked by the main solenoid valve 41, the supply of the main chamber mixture to the main chamber 11 is stopped. When the gas flow path R2 of the sub chamber gas line 32 is blocked by the sub electromagnetic valve 44, the supply of the sub chamber mixture to the sub chamber 12 is stopped.

  The second fuel cutoff processing unit 53 needs to stop the supply of the fuel gas based on the determination result in the state determination processing unit 51, and in the second state, Both the main control valve 43 and the sub chamber differential pressure control valve 46 are shut off. When the gas flow path R1 of the main chamber gas line 31 is blocked by the main electromagnetic valve 41 and the main control valve 43, the supply of the main chamber mixture to the main chamber 11 is stopped. When the gas flow path R2 of the sub chamber gas line 32 is shut off by the sub electromagnetic valve 44 and the sub chamber differential pressure control valve 46, the supply of the sub chamber mixture to the sub chamber 12 is stopped.

  Here, the main control valve 43 and the sub chamber differential pressure control valve 46 described above have higher responsiveness than the main electromagnetic valve 41 and the sub electromagnetic valve 44. Therefore, the second fuel shutoff processing unit 53 shuts off the main control valve 43 and the sub chamber differential pressure control valve 46 in addition to the main solenoid valve 41 and the sub solenoid valve 44, so that the fuel to the engine main body 10 is shut off. The supply of gas is urgently stopped in a shorter time than the first fuel cutoff processing unit 52.

  The main control valve 43 is provided on the most downstream side of the plurality of valve devices 40 (the main electromagnetic valve 41, the main pressure regulator 42, and the main control valve 43) provided in the main chamber gas line 31. For this reason, after the main control valve 43 is shut off, the amount of fuel gas remaining between the main control valve 43 and the main chamber 11 is determined by the other valve device 40 provided on the upstream side of the main control valve 43. Less and minimal compared to blocking.

  Similarly, the sub chamber differential pressure control valve 46 is the most downstream of the plurality of valve devices 40 (sub electromagnetic valve 44, sub pressure regulator 45, sub chamber differential pressure control valve 46) provided in the sub chamber gas line 32. Is provided. Therefore, after the sub chamber differential pressure control valve 46 is shut off, the amount of fuel gas remaining between the sub chamber differential pressure control valve 46 and the sub chamber 12 is upstream of the sub chamber differential pressure control valve 46. Compared to the case where the other valve device 40 provided in is cut off, the number is minimal.

Next, a method for controlling the gas engine 1 as described above will be described.
As shown in FIG. 3, the controller 50 confirms command information output from a system controller (not shown) that controls the entire cogeneration system provided with the gas engine 1 at predetermined time intervals (step S1). ).

  Based on command information received from a system controller (not shown), the state determination processing unit 51 of the controller 50 needs to stop the supply of fuel gas to the engine body 10 and determines whether or not it is in the first state. Determine (step S2). If it is determined in step S2 that the state is the first state (Yes), the process proceeds to the first fuel cutoff processing step S3.

  In the first fuel cutoff processing step S3, only the main solenoid valve 41 and the sub solenoid valve 44 are shut off by the first fuel cutoff processing unit 52 of the controller 50. When the main electromagnetic valve 41 and the sub electromagnetic valve 44 are shut off, the gas flow path R1 of the main chamber gas line 31 and the gas flow path R2 of the sub chamber gas line 32 are blocked, and the main chamber 11 and the sub chamber 12 The supply of fuel gas (main chamber mixture and sub-chamber mixture) to is stopped.

  Then, the fuel gas remaining in the gas flow path R1 downstream of the main electromagnetic valve 41 in the main chamber gas line 31 and the gas flow path R2 downstream of the sub electromagnetic valve 44 in the sub chamber gas line 32 remain. After the fuel gas is supplied to the main chamber 11 and the sub chamber 12 and combusted, the engine body 10 stops.

  If it is determined in step S2 that the state is not the first state (No), the process proceeds to step S4. In step S4, based on command information received from a system controller (not shown), the controller 50 needs to stop the supply of fuel gas to the engine body 10 in an emergency stop in a shorter time than the first state. It is determined whether or not. If it is determined in step S4 that the state is the second state (Yes), the process proceeds to the second fuel cutoff processing step S5.

  In the second fuel shutoff processing step S5, the second fuel shutoff processing unit 53 of the controller 50 shuts off both the main solenoid valve 41 and the sub solenoid valve 44, and the main control valve 43 and the sub chamber differential pressure control valve 46. To. When the gas flow path R1 of the main chamber gas line 31 is shut off by the main electromagnetic valve 41 and the main control valve 43, the supply of the main chamber mixture to the main chamber 11 is stopped. When the gas flow path R2 of the sub chamber gas line 32 is blocked by the sub electromagnetic valve 44 and the sub chamber differential pressure control valve 46, the supply of the sub chamber mixture to the sub chamber 12 is stopped.

  Then, the fuel gas remaining in the gas flow path R1 downstream of the main control valve 43 in the main chamber gas line 31 and the gas flow path R2 downstream of the sub chamber differential pressure control valve 46 in the sub chamber gas line 32. After the remaining fuel gas is supplied to the main chamber 11 and the sub chamber 12 and burned, the engine body 10 stops. Since the main control valve 43 and the sub chamber differential pressure control valve 46 are provided on the most downstream side in the main chamber gas line 31 and the sub chamber gas line 32, the amount of fuel gas remaining in the gas flow paths R1, R2 is Less than in the first state. Thereby, the supply of the fuel gas to the main chamber 11 and the sub chamber 12 is stopped in a shorter time than in the first state, and the operation of the engine body 10 is also stopped in an emergency.

  If it is determined in step S4 that the state is not the second state (No), the process returns to step S2 to repeat the series of processes described above.

  In the first embodiment described above, in the first state where it is necessary to stop the supply of fuel gas, the main electromagnetic valve in which at least one valve device 40 is disposed downstream of the plurality of valve devices 40. 41, only the sub electromagnetic valve 44 is in a shut-off state. In the case of the second state where the supply of the fuel gas needs to be urgently stopped in a shorter time than the first state, the main control valve 43 disposed on the most downstream side of the plurality of valve devices 40, the sub chamber differential pressure Both the control valve 46, the main solenoid valve 41, and the sub solenoid valve 44 are shut off. In this way, in addition to the main solenoid valve 41 and the sub solenoid valve 44, the main control valve 43 and the sub chamber differential pressure control valve 46 arranged on the most downstream side are brought into a shut-off state, which is compared with the case of the first state. Thus, the supply of the fuel gas remaining in the main chamber gas line 31 and the sub chamber gas line 32 to the engine body 10 can be minimized. Therefore, compared with the case where only the main solenoid valve 41 and the sub solenoid valve 44 are shut off, the fuel supply can be reliably stopped in a shorter time.

In the embodiment described above, the main solenoid valve 41 and the sub solenoid valve 44 are solenoid valves capable of on / off control of the fuel gas supply, and the main control valve 43 and the sub chamber differential pressure control valve 46 are the fuel gas supply valves. It is a control valve that can adjust the supply amount.
The main control valve 43 and the sub chamber differential pressure control valve 46 are excellent in responsiveness compared to the main electromagnetic valve 41 and the sub electromagnetic valve 44. Therefore, compared with the case where only the main solenoid valve 41 and the sub solenoid valve 44 are shut off, the fuel supply can be reliably stopped in a shorter time.

  In the embodiment described above, it is determined that the state is the second state when a misfire occurs simultaneously in the plurality of cylinders 14 of the engine body 10. Therefore, when a misfire occurs simultaneously in the plurality of cylinders 14 of the engine body 10, the supply of fuel gas can be urgently stopped in a shorter time.

  In the embodiment described above, it is determined that the engine is in the second state when the output of the engine body 10 rapidly decreases. Therefore, when the output of the engine main body 10 rapidly decreases, the supply of fuel gas can be urgently stopped in a shorter time.

  In the above-described embodiment, when the ignition device 16 that ignites the air-fuel mixture of fuel gas and air is in a failed state, it is determined as the second state. Therefore, when the ignition device 16 is in a failed state, the supply of the fuel gas can be urgently stopped in a shorter time.

(Other variations)
The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.
For example, the configuration of the gas engine 1 is not limited to the configuration shown in the above embodiment, and can be changed as appropriate. For example, although the supercharger 38 is provided in the above-described embodiment, a configuration in which the supercharger 38 is not provided is also possible. The engine is not limited to the sub-chamber type gas engine 1. For example, the present invention can be applied to an engine that does not include a sub chamber. When the engine does not include a sub chamber, the sub chamber gas line 32 described above may be omitted.

  Further, in the above-described embodiment, when the main chamber gas line 31 and the sub chamber gas line 32 are in the second state, the main control valve 43 and the sub chamber differential pressure control provided for adjusting the flow rate of the fuel gas. The valve 46 is in a shut-off state. However, the present invention is not limited to such a configuration. For example, a control valve is provided downstream of the main control valve 43 and the sub chamber differential pressure control valve 46 provided for adjusting the flow rate of the fuel gas, and the second In the case of a state, these control valves may be in a shut-off state.

  In addition to this, as a second state, a state in which a misfire has occurred simultaneously in a plurality of cylinders 14 of the gas engine 1, a state in which the output of the gas engine 1 has suddenly decreased, and an ignition that ignites an air-fuel mixture of fuel gas and air Although the state in which the device has failed is illustrated, the present invention is not limited thereto. When it is in a state other than this, the engine main body 10 may be urgently stopped in a shorter time than the normal first state as the second state.

  In the above-described embodiment, the case where the fuel supply is stopped in both the main chamber gas line 31 and the sub chamber gas line 32 has been described. However, the fuel supply to only one of the main chamber gas line 31 and the sub chamber gas line 32 may be stopped, for example, the fuel supply only to the main chamber gas line 31 is stopped.

  In the embodiment described above, the case where the main pressure regulator 42 is provided in the main chamber gas line 31 as the valve device 40 has been illustrated. Furthermore, the case where the sub pressure regulator 45 was provided in the sub chamber gas line 32 as the valve apparatus 40 was illustrated. However, the main pressure regulator 42 and the sub pressure regulator 45 may be provided as necessary. Further, the main chamber gas line 31 and the sub chamber gas line 32 may be provided with a valve device 40 other than the valve device 40 exemplified in the above-described embodiment.

  In the embodiment described above, the case where the gas cooler 48 and the gas compressor 47 are provided on the upstream side of the sub electromagnetic valve 44 of the sub chamber gas line 32 has been described. However, the gas cooler 48 and the gas compressor 47 may be provided as necessary.

DESCRIPTION OF SYMBOLS 1 Gas engine 10 Engine main body 11 Main chamber 12 Sub chamber 13 Output shaft 14 Cylinder 15 Exhaust part 16 Ignition device 20 Fuel supply control device 31 Main chamber gas line (gas piping, main chamber gas piping)
32 Sub chamber gas line (gas piping, sub chamber gas piping)
33 Main chamber air-fuel mixture generator 34 Air cleaner 35 Venturi mixer 36 Air cooler 38 Supercharger 38a Turbine 38b Main shaft 38c Compressor 40 Valve device 41 Main solenoid valve (first valve device)
42 Main pressure regulator 43 Main control valve (second valve device, main chamber second valve device)
44 Sub solenoid valve (first valve device, sub chamber second valve device)
45 Sub pressure regulator 46 Sub chamber differential pressure control valve (second valve device)
47 Gas compressor 48 Gas cooler 50 Controller 51 State determination processing unit 52 First fuel cutoff processing unit 53 Second fuel cutoff processing unit R1, R2 Gas flow path

Claims (9)

Gas piping for supplying fuel gas;
A plurality of valve devices provided at intervals in the flow direction of the fuel gas and capable of blocking a gas flow path in the gas pipe;
A fuel supply control device for a gas engine comprising:
In the first state where it is necessary to stop the supply of the fuel gas, only the first valve device in which at least one valve device is disposed downstream of the plurality of valve devices is shut off. A fuel shut-off processing unit;
In the case of the second state where the supply of the fuel gas needs to be stopped in a shorter time than the first state, the second valve disposed on the most downstream side of the first valve device and the plurality of valve devices. A fuel supply control device comprising: a second fuel cutoff processing unit that puts both of the devices into a cutoff state. The first valve device is an electromagnetic valve capable of on / off control of the supply of the fuel gas,
The fuel supply control device according to claim 1, wherein the second valve device is a control valve capable of adjusting a supply amount of the fuel gas. 3. The fuel supply control device according to claim 1, wherein the second state is a state in which misfire has occurred simultaneously in a plurality of cylinders of an engine body of the gas engine. The fuel supply control device according to any one of claims 1 to 3, wherein the second state is a state in which the output of the gas engine has rapidly decreased. The fuel supply control device according to any one of claims 1 to 4, wherein the second state is a state in which an ignition device that ignites an air-fuel mixture of the fuel gas and air has failed. A fuel supply control device according to any one of claims 1 to 5,
An engine main body to which the fuel gas is supplied by the fuel supply control device. The engine body includes a main chamber and a sub chamber,
The gas pipe includes a main chamber gas pipe for supplying fuel gas to the main chamber, and a sub chamber gas pipe for supplying fuel gas to the sub chamber,
The second valve device is
The gas engine of Claim 6 provided with the main chamber 2nd valve apparatus provided in the said main chamber gas piping, and the subchamber second valve apparatus provided in the said subchamber gas piping. Gas piping for supplying fuel gas;
A plurality of valve devices provided at intervals in the flow direction of the fuel gas and capable of blocking a gas flow path in the gas pipe;
A method for controlling a gas engine comprising:
In the first state where it is necessary to stop the supply of the fuel gas, the first fuel that shuts off only the first valve device in which at least one valve device is arranged on the downstream side among the plurality of valve devices. A blocking process step;
In the case of the second state where the supply of the fuel gas needs to be stopped in a shorter time than the first state, the second valve disposed on the most downstream side of the first valve device and the plurality of valve devices. And a second fuel shutoff process step for shutting off both of the devices. A program for causing a computer of a fuel supply control device that controls supply of fuel gas to function,
In the first state where it is necessary to stop the supply of the fuel gas, only the first valve device in which at least one valve device is arranged on the downstream side among the plurality of valve devices of the fuel supply control device is provided. Processing steps to block;
In the case of the second state where the supply of the fuel gas needs to be stopped in a shorter time than the first state, the second valve disposed on the most downstream side of the first valve device and the plurality of valve devices. A processing step that shuts off both the device and
A program that executes

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