Multi-valve linked gas engine variable composition fuel supply system and method of supplying

Abstract

A multi-valve linkage gas engine variable component fuel supply system and its supply method. The present invention relates to the technical field of gas engine. In order to solve the problem that the existing gas engine fuel supply system cannot meet the requirement of engine on fuel stability, the present invention provides a supply system, which comprises an air inlet manifold, a fuel gas manifold, a premixing chamber, a natural gas regulating valve, a coal bed gas regulating valve, a natural gas rail, a natural gas storage tank, a coal bed gas storage tank, an air inlet manifold, a natural gas manifold regulating valve, an exhaust manifold, an oxygen sensor and a controller. The natural gas manifold regulating valve is arranged on the air inlet manifold, the oxygen sensor is arranged on the exhaust manifold, the air outlet end of the premixing chamber is connected with the air inlet manifold through the fuel gas manifold, the air inlet end of the premixing chamber is connected with the natural gas regulating valve and the coal bed gas regulating valve, and the oxygen sensor, the coal bed gas regulating valve, the natural gas regulating valve and the natural gas manifold regulating valve are electrically connected with the controller. The present invention is used for gas engine variable component fuel supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas engine, in particular to a multi-valve linkage type gas engine variable component fuel supply system and a supply method thereof. BACKGROUND

[0002] With the increasingly prominent energy and environmental problems, the International Maritime Organization (IMO) and China have formulated increasingly stringent emission regulations and "carbon peak and carbon neutral" targets, respectively. The stringent emission regulations have made the survival and development of traditional diesel engine and gasoline engine enterprises face unprecedented challenges, so developing efficient and clean combustion technology has become the consensus in the international energy power field.

[0003] Coalbed gas, also known as coalbed methane, is a gas resource that coexists and is associated with coal, often adhering to the surface of coal matrix particles or existing in the cracks of coal blocks and rock layers. It is a multi-component complex low-calorific value gas material, the main component of which is methane and other low-carbon alkanes, but it hardly contains any sulfur, dust and other harmful substances. This characteristic makes coalbed gas not only a gas fuel with relatively high calorific value, but also produces much less carbon dioxide during combustion than other fossil fuels. Therefore, promoting the development of coalbed gas combustion technology is an important measure to improve the greenhouse effect and improve social and economic benefits.

[0004] The technical application of coalbed gas also faces certain challenges, because gas engines are relatively sensitive to changes in air-fuel ratio, and coalbed gas is complex, containing not only low-carbon alkanes, but also non-combustible substances such as carbon dioxide, and its components will change with conditions such as terrain, climate and mining depth. Chinese patent CN109764346B can be safely treated by catalyzing, heating and diluting coalbed gas, but it cannot meet the requirements of engine fuel stability. SUMMARY

[0005] The present application is to solve the problem that the existing gas engine fuel supply system cannot meet the requirements of engine fuel stability, and further proposes a multi-valve linkage type gas engine variable component fuel supply system and a supply method thereof.

[0006] The technical solution adopted by the present application to solve the above technical problems is:

[0007] The multi-valve linkage type gas engine variable component fuel supply system comprises an intake manifold, a fuel gas manifold, a premixing chamber, a natural gas regulating valve, a coal bed gas regulating valve, a natural gas rail, a natural gas tank, a coal bed gas tank, an intake manifold, a natural gas manifold regulating valve, an exhaust manifold, an oxygen sensor and a controller, the outlet end of the intake manifold is connected with the inlet end of the intake manifold, the natural gas manifold regulating valve is arranged on the intake manifold, the inlet end of the natural gas manifold regulating valve is connected with the outlet end of the natural gas rail, the outlet end of the intake manifold is connected with the inlet end of the gas engine, the outlet end of the gas engine is connected with the inlet end of the exhaust manifold, the oxygen sensor is arranged on the exhaust manifold, the outlet end of the premixing chamber is connected with the intake manifold through the fuel gas manifold, the inlet end of the premixing chamber is connected with the natural gas regulating valve and the coal bed gas regulating valve, the inlet end of the natural gas regulating valve is connected with the outlet end of the natural gas rail, the inlet end of the natural gas rail is connected with the outlet end of the natural gas tank through a natural gas pipeline, the inlet end of the coal bed gas regulating valve is connected with the outlet end of the coal bed gas tank through a coal bed gas pipeline, and the oxygen sensor, the coal bed gas regulating valve, the natural gas regulating valve and the natural gas manifold regulating valve are electrically connected with the controller.

[0008] Further, the signal output end of the oxygen sensor is connected with the signal input end of the controller, the signal output end of the controller is connected with the signal input end of the coal bed gas regulating valve, the natural gas regulating valve and the natural gas manifold regulating valve respectively.

[0009] Further, the number of the outlet ends of the intake manifold and the number of the inlet ends of the exhaust manifold are the same as the number of the cylinders in the gas engine, the number of the natural gas manifold regulating valves and the number of the oxygen sensors are the same as the number of the cylinders in the gas engine, one natural gas manifold regulating valve is arranged on each outlet end of the intake manifold, and one oxygen sensor is arranged on each inlet end of the exhaust manifold.

[0010] Further, the natural gas pipeline is connected with a natural gas pressure regulating device.

[0011] Further, the coal bed gas pipeline is connected with a coal bed gas pressure regulating device.

[0012] Further, the oxygen sensor is an air-fuel ratio sensor.

[0013] Further, the controller is an ECU electronic controller.

[0014] The supply method of the multi-valve linkage type gas engine variable component fuel supply system comprises a dual fuel supply mode, and the dual fuel supply mode comprises the following steps:

[0015] The controller presets the opening degree of the coalbed gas regulating valve according to the working condition map, the coalbed gas flows into the air intake manifold, passes through the air intake manifold and enters the cylinder of the gas engine for combustion, the tail gas is discharged by the exhaust manifold, the oxygen sensor sequentially transmits the air-fuel ratio signal to the controller, the controller adjusts the natural gas manifold regulating valve according to the received signal, controls the inflow amount of the natural gas, and maintains the air-fuel ratio of all the cylinders of the gas engine at the target value.

[0016] A supply method of a multi-valve linkage type gas engine variable component fuel supply system includes a mixed fuel supply mode, and the mixed fuel supply mode includes the following steps:

[0017] The controller presets the opening degree of the coalbed gas regulating valve and the natural gas regulating valve according to the working condition map, the coalbed gas and the natural gas flow into the premixing chamber for mixing, and then flow into the air intake manifold through the gas manifold, pass through the air intake manifold and enter the cylinder of the gas engine for combustion, and the tail gas is discharged by the exhaust manifold.

[0018] A supply method of a multi-valve linkage type gas engine variable component fuel supply system includes a natural gas supply mode, and the natural gas supply mode includes the following steps:

[0019] The controller presets the opening degree of the natural gas regulating valve according to the working condition map, the natural gas flows into the air intake manifold, passes through the air intake manifold and enters the cylinder of the gas engine for combustion, the tail gas is discharged by the exhaust manifold, the oxygen sensor sequentially transmits the air-fuel ratio signal to the controller, the controller adjusts the natural gas manifold regulating valve according to the received signal, controls the inflow amount of the natural gas, and maintains the air-fuel ratio of all the cylinders of the gas engine at the target value.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. The mixed supply mode is adopted to adjust the supply ratio of the coalbed gas and the natural gas, the coalbed gas is supplied to the manifold, the natural gas is supplied to the manifold, the structure of the coalbed gas supply can be ensured to be simple, and the accuracy of the gas component regulation and the rapid response can be ensured.

[0022] 2. The tail gas oxygen sensor is arranged on the exhaust manifold to monitor the engine combustion condition, and the ECU control unit converts the signal collected by the tail gas oxygen sensor into a control signal, which is used for regulating the supply of the coalbed gas and the natural gas, so that closed-loop control is realized, the system stability can be improved when the working condition of the engine changes or the composition of the coalbed gas changes.

[0023] 3. The normal working mode of the variable component fuel supply system is the coalbed gas and natural gas dual-fuel supply mode, the ECU controller receives the air-fuel ratio and then feedback adjusts the natural gas manifold regulating valve, so that the air-fuel ratio of all the cylinders of the natural gas engine is maintained at the target value.

[0024] 4、In order to improve the reliability of the gas supply system, the present application considers two possible failure conditions of the gas supply system, namely natural gas manifold supply pipeline failure and coal bed gas supply pipeline failure, and the mixed fuel supply mode and the natural gas supply mode are opened correspondingly when failure occurs, so as to meet the requirements of the engine on fuel stability. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall structure schematic diagram of the present application; DETAILED DESCRIPTION

[0026] Specific implementation one: combined Figure 1 In this embodiment, a multi-valve linkage type gas engine variable component fuel supply system includes an intake manifold 1, a fuel gas manifold 2, a premixing chamber 3, a natural gas regulating valve 4, a coal bed gas regulating valve 5, a natural gas rail 6, a natural gas storage tank 9, a coal bed gas storage tank 10, an intake manifold 11, a natural gas manifold regulating valve 12, an exhaust manifold 13, an oxygen sensor 14 and a controller 15. The gas outlet end of the intake manifold 1 is connected to the gas inlet end of the intake manifold 11. The natural gas manifold regulating valve 12 is arranged on the intake manifold 11. The gas inlet end of the natural gas manifold regulating valve 12 is connected to the gas outlet end of the natural gas rail 6. The gas outlet end of the intake manifold 11 is connected to the gas inlet end of the gas engine. The gas outlet end of the gas engine is connected to the gas inlet end of the exhaust manifold 13. The oxygen sensor 14 is arranged on the exhaust manifold 13. The gas outlet end of the premixing chamber 3 is connected to the intake manifold 1 through the fuel gas manifold 2. The gas inlet end of the premixing chamber 3 is connected to the natural gas regulating valve 4 and the coal bed gas regulating valve 5. The gas inlet end of the natural gas regulating valve 4 is connected to the gas outlet end of the natural gas rail 6. The gas inlet end of the natural gas rail 6 is connected to the gas outlet end of the natural gas storage tank 9 through a natural gas pipeline. The gas inlet end of the coal bed gas regulating valve 5 is connected to the gas outlet end of the coal bed gas storage tank 10 through a coal bed gas pipeline. The oxygen sensor 14, the coal bed gas regulating valve 5, the natural gas regulating valve 4 and the natural gas manifold regulating valve 12 are electrically connected to the controller 15.

[0027] The coal bed gas regulating valve 5 and the natural gas regulating valve 4 respectively regulate the flow of coal bed gas and natural gas into the intake manifold 1. The natural gas manifold regulating valve 12 regulates the flow of natural gas into the intake manifold 11. The oxygen sensor 14 is arranged on the exhaust manifold 13 and can sense the air-fuel ratio condition by detecting the composition of the exhaust gas and feed back the signal to the controller 15. The controller 15 is the control core of the fuel supply system, which is responsible for receiving the signal of the oxygen sensor 14 and controlling the opening degree of the coal bed gas regulating valve 5, the natural gas regulating valve 4 and all the natural gas manifold regulating valves 12.

[0028] The controller 15 changes the opening degree of each adjusting valve to realize flexible switching between the pure natural gas mode and the natural gas and coal bed gas dual fuel mode, improve the system reliability, realize closed loop control of the air-fuel ratio under variable working conditions, and improve the economy and emission.

[0029] The coal bed gas adjusting valve 5, the natural gas adjusting valve 4 and the natural gas manifold adjusting valve 12 are butterfly valve structures, the number of the coal bed gas adjusting valve 5 and the natural gas adjusting valve 4 is 1, the number of the natural gas manifold adjusting valve 12 is equal to the number of the cylinders, the adjusting valves are not interfered with each other, and are independently controlled by the controller 15.

[0030] The premixing chamber 3 is a three-way communicating chamber, two inlets are respectively arranged with a coal bed gas adjusting valve 5 and a natural gas adjusting valve 4, and the outlet is communicated with the gas main pipe 2.

[0031] The purpose of the application is to provide a multi-valve linkage type gas engine variable component fuel supply system, adjust the intake flow of the coal bed gas and the natural gas, realize closed loop control of the air-fuel ratio, and guarantee stable combustion of the multi-cylinder gas engine.

[0032] Specific implementation method two: combined with Figure 1 In this embodiment, the signal output end of the oxygen sensor 14 is connected with the signal input end of the controller 15, the signal output end of the controller 15 is connected with the signal input end of the coal bed gas adjusting valve 5, the natural gas adjusting valve 4 and the natural gas manifold adjusting valve 12 respectively. The technical features not disclosed in this embodiment are the same as those in the specific implementation method one.

[0033] The controller 15 receives the signal from the oxygen sensor 14, and outputs the control signal to the coal bed gas adjusting valve 5, the natural gas adjusting valve 4 and the natural gas manifold adjusting valve 12.

[0034] Specific implementation method three: combined with Figure 1 In this embodiment, the number of the gas outlet end of the intake manifold 11 and the number of the gas inlet end of the exhaust manifold 13 are the same as the number of the cylinders in the gas engine, the number of the natural gas manifold adjusting valve 12 and the number of the oxygen sensor 14 are the same as the number of the cylinders in the gas engine, each gas outlet end of the intake manifold 11 is provided with a natural gas manifold adjusting valve 12, and each gas inlet end of the exhaust manifold 13 is provided with an oxygen sensor 14. The technical features not disclosed in this embodiment are the same as those in the specific implementation method two.

[0035] Specific implementation method four: combined with Figure 1 In this embodiment, the natural gas pipeline is connected with the natural gas pressure regulating device 7. The technical features not disclosed in this embodiment are the same as those in the specific implementation method one.

[0036] This design ensures that the upstream of the natural gas regulating valve 4 and the natural gas manifold regulating valve 12 is always at a constant pressure.

[0037] Specific embodiment five: combination Figure 1 This embodiment is described, and the coalbed methane pressure regulating device 8 is connected to the coalbed methane pipeline in this embodiment. The technical features not disclosed in this embodiment are the same as those in specific embodiment one.

[0038] This design ensures that the upstream of the coalbed methane regulating valve 5 is always at a constant pressure.

[0039] Specific embodiment six: combination Figure 1 This embodiment is described, and the oxygen sensor 14 is an air-fuel ratio sensor in this embodiment. The technical features not disclosed in this embodiment are the same as those in specific embodiment one.

[0040] The oxygen sensor 14 is an air-fuel ratio sensor, which calculates the actual air-fuel ratio corresponding to the cylinder and independently transmits it to the controller 15. Each oxygen sensor 14 is independently connected to the controller 15.

[0041] Specific embodiment seven: combination Figure 1 This embodiment is described, and the controller 15 is an ECU electronic controller in this embodiment. The technical features not disclosed in this embodiment are the same as those in specific embodiment one.

[0042] Specific embodiment eight: combination Figure 1 This embodiment is described, and the supply method of the multi-valve linkage type gas engine variable component fuel supply system includes a dual fuel supply mode, which includes the following steps:

[0043] The controller 15 presets the opening degree of the coalbed methane regulating valve 5 according to the operating condition map, the coalbed methane flows into the intake manifold 1, passes through the intake manifold 11 to enter the gas engine cylinder for combustion, the exhaust gas is discharged by the exhaust manifold 13, and the oxygen sensor 14 sequentially transmits the air-fuel ratio signal to the controller 15. The controller 15 adjusts each natural gas manifold regulating valve 12 according to the received signal to control the amount of natural gas flowing in, so that the air-fuel ratio of all cylinders of the gas engine is maintained at the target value.

[0044] The normal working mode of the fuel supply system is a coalbed methane and natural gas dual fuel supply mode.

[0045] The operating condition map is an operating condition map.

[0046] Specific embodiment nine: combination Figure 1 This embodiment is described, and the supply method of the multi-valve linkage type gas engine variable component fuel supply system includes a mixed fuel supply mode, which includes the following steps:

[0047] The controller 15 presets the opening degree of the coalbed gas regulating valve 5 and the natural gas regulating valve 4 according to the working condition map, the coalbed gas and the natural gas flow into the premixing chamber 3 to mix, and then flow into the intake manifold 1 by the gas main 2, enter the cylinder of the gas engine through the intake manifold 11 to burn, and the exhaust gas is discharged by the exhaust manifold 13.

[0048] The abnormal working mode of the fuel supply system comprises a mixed fuel supply mode, and the mixed fuel supply mode is a mixed supply of the coalbed gas and the natural gas.

[0049] The mixed fuel supply mode is a backup supply mode when the natural gas manifold supply pipeline fails.

[0050] Specific embodiment ten: combination Figure 1 In the embodiment, a supply method of a multi-valve linkage type gas engine variable component fuel supply system comprises a natural gas supply mode, and the natural gas supply mode comprises the following steps:

[0051] The controller 15 presets the opening degree of the natural gas regulating valve 4 according to the working condition map, the natural gas flows into the intake manifold 1, enters the cylinder of the gas engine through the intake manifold 11 to burn, the exhaust gas is discharged by the exhaust manifold 13, the oxygen sensor 14 sequentially transmits the air-fuel ratio signal to the controller 15, the controller 15 adjusts each natural gas manifold regulating valve 12 according to the received signal, controls the natural gas inflow, and maintains the air-fuel ratio of all the cylinders of the gas engine at the target value.

[0052] The abnormal working mode of the fuel supply system comprises a natural gas supply mode.

[0053] The natural gas supply mode is a backup supply mode when the coalbed gas supply pipeline fails.

[0054] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-valve linked gas engine variable composition fuel supply system characterized by: It includes intake manifold (1), gas manifold (2), premixing chamber (3), natural gas regulating valve (4), coalbed gas regulating valve (5), natural gas rail (6), natural gas storage tank (9), coalbed gas storage tank (10), intake manifold (11), natural gas manifold regulating valve (12), exhaust manifold (13), oxygen sensor (14) and controller (15), the gas outlet end of intake manifold (1) is connected with the gas inlet end of intake manifold (11), the natural gas manifold regulating valve (12) is arranged on intake manifold (11), the gas inlet end of natural gas manifold regulating valve (12) is connected with the gas outlet end of natural gas rail (6), the gas outlet end of intake manifold (11) is connected with the gas inlet end of gas engine, the gas outlet end of gas engine is connected with the gas inlet end of exhaust manifold (13), oxygen sensor (14) is arranged on exhaust manifold (13), the gas outlet end of premixing chamber (3) is connected with intake manifold (1) through gas manifold (2), the gas inlet end of premixing chamber (3) is connected with natural gas regulating valve (4) and coalbed gas regulating valve (5), the gas inlet end of natural gas regulating valve (4) is connected with the gas outlet end of natural gas rail (6), the gas inlet end of natural gas rail (6) is connected with the gas outlet end of natural gas storage tank (9) through natural gas pipeline, the gas inlet end of coalbed gas regulating valve (5) is connected with the gas outlet end of coalbed gas storage tank (10) through coalbed gas pipeline, oxygen sensor (14), coalbed gas regulating valve (5), natural gas regulating valve (4) and natural gas manifold regulating valve (12) are electrically connected with controller (15) respectively.

2. A multi-valve linked gas engine variable composition fuel supply system in accordance with claim 1, wherein: The signal output end of oxygen sensor (14) is connected with the signal input end of controller (15), the signal output end of controller (15) is connected with the signal input end of coalbed gas regulating valve (5), natural gas regulating valve (4) and natural gas manifold regulating valve (12) respectively.

3. A multi-valve linked gaseous machine variable composition fuel supply system according to claim 2, characterized in that: The number of gas outlet end of intake manifold (11) and the number of gas inlet end of exhaust manifold (13) are same with the number of cylinder in gas engine, the number of natural gas manifold regulating valve (12) and oxygen sensor (14) are same with the number of cylinder in gas engine, one natural gas manifold regulating valve (12) is arranged on each gas outlet end of intake manifold (11), one oxygen sensor (14) is arranged on each gas inlet end of exhaust manifold (13).

4. A multi-valve linked gas engine variable composition fuel supply system in accordance with claim 1, wherein: Natural gas pressure regulating device (7) is connected on the natural gas pipeline.

5. A multi-valve linked gaseous machine variable composition fuel supply system in accordance with claim 1, characterized by: Coalbed gas pressure regulating device (8) is connected on the coalbed gas pipeline.

6. A multi-valve linked gaseous machine variable composition fuel supply system in accordance with claim 1, characterized by: Oxygen sensor (14) is air-fuel ratio sensor.

7. A multi-valve linked gaseous machine variable composition fuel supply system in accordance with claim 1, characterized by: Controller (15) is ECU electronic controller.

8. A method of supplying a variable composition fuel to a multi-valve linked gas engine according to any one of claims 1 to 7, characterized in that: The method includes dual fuel supply mode, and the dual fuel supply mode includes the following steps: The controller (15) presets the opening degree of the coalbed gas regulating valve (5) according to the working condition map, the coalbed gas flows into the intake manifold (1), enters the cylinder of the gas engine through the intake manifold (11) to burn, the tail gas is discharged through the exhaust manifold (13), the oxygen sensor (14) sequentially transmits the air-fuel ratio signal to the controller (15), the controller (15) adjusts the natural gas manifold regulating valve (12) according to the received signal, controls the inflow amount of the natural gas, and maintains the air-fuel ratio of all cylinders of the gas engine at the target value.

9. A method of supplying a variable composition fuel to a multi-valve linked gas engine according to any one of claims 1 to 7, characterized in that: The method comprises a mixed fuel supply mode, and the mixed fuel supply mode comprises the following steps: The controller (15) presets the opening degree of the coalbed gas regulating valve (5) and the natural gas regulating valve (4) according to the working condition map, the coalbed gas and the natural gas flow into the premixing chamber (3) to mix, and then flow into the intake manifold (1) through the gas main (2), enter the cylinder of the gas engine through the intake manifold (11) to burn, and the tail gas is discharged through the exhaust manifold (13).

10. A method of supplying a variable composition fuel to a multi-valve linked gas engine according to any one of claims 1 to 7, characterized in that: The method comprises a natural gas supply mode, and the natural gas supply mode comprises the following steps: The controller (15) presets the opening degree of the natural gas regulating valve (4) according to the working condition map, the natural gas flows into the intake manifold (1), enters the cylinder of the gas engine through the intake manifold (11) to burn, and the tail gas is discharged through the exhaust manifold (13), the oxygen sensor (14) sequentially transmits the air-fuel ratio signal to the controller (15), the controller (15) adjusts the natural gas manifold regulating valve (12) according to the received signal, controls the inflow amount of the natural gas, and maintains the air-fuel ratio of all cylinders of the gas engine at the target value.

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