Dual fuel coordinated injection system and ship

Abstract

The present invention relates to the field of power machinery technology, and in particular to a dual-fuel coordinated injection system and a ship. The dual-fuel coordinated injection system includes two groups of fuel supply components and an injector, each group of fuel supply components includes a gas supply pump, a control valve, a boost pump, a fuel tank and a fuel supply pump, the gas outlet of the gas supply pump is connected to the air inlet of the control valve, the two working ports of the control valve are respectively connected to the two air inlets and outlets of the boost pump, the oil inlet of the fuel supply pump is connected to the fuel tank, and the oil outlet of the fuel supply pump is connected to the oil inlet of the boost pump; the oil outlets of the boost pumps in the two groups of fuel supply components are connected to the oil inlet of the injector, and the injector can spray oil into the cylinder of the engine. Different fuels can be contained in the fuel tanks of the two groups of fuel supply components, which improves the flexibility of the system fuel use and can also reduce the carbon emissions of the system; the other two groups of fuel supply components share an injector, which can reduce the cost of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of power machinery, and in particular to a dual-fuel coordinated injection system and a ship. Background Art

[0002] With increasingly stringent emission regulations, traditional diesel engines have become increasingly difficult to meet the emission standards for marine engines. Therefore, seeking low-carbon and zero-carbon fuels to replace traditional fossil fuels has become a very critical and effective way to solve ship carbon emissions. At present, various new fuels such as methanol, ethanol, LPG, LNG, ammonia, hydrogen, DME, etc. have been technically proven to be used for reciprocating internal combustion engine combustion, that is, they can replace traditional diesel fuel for engine use, and according to the type of fuel, they can reduce ship carbon emissions to varying degrees. However, unlike traditional diesel fuel, the above-mentioned new fuels have common characteristics of low viscosity, low lightning, low calorific value, and strong corrosion, strong toxicity and other individual characteristics. As a result, the fuel injection system needs to be customized. The customized fuel injection system makes the cost of ship modification and use high, and the flexibility of fuel use is reduced. Summary of the invention

[0003] The purpose of the present invention is to provide a dual-fuel coordinated injection system and a ship, which improves the flexibility of system fuel use and reduces the carbon emission of the system.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] Dual fuel coordinated injection system, including:

[0006] Two groups of fuel supply components, each group of the fuel supply components includes a gas supply pump, a control valve, a booster pump, a fuel tank and a fuel supply pump, the air inlet of the gas supply pump is connected to the air source, the air outlet of the gas supply pump is connected to the air inlet of the control valve, the two working ports of the control valve are respectively connected to the two air inlet and outlet ports of the booster pump, the oil inlet of the fuel supply pump is connected to the fuel tank, and the oil outlet of the fuel supply pump is connected to the oil inlet of the booster pump;

[0007] Injector, the oil outlets of the boost pumps in the two groups of fuel supply assemblies are both connected to the oil inlet of the injector, and the injector can spray oil into the cylinder of the engine.

[0008] As a preferred technical solution for the dual-fuel coordinated injection system, the boost pump includes a gas chamber, a fuel chamber and a piston rod, the piston rod includes a connecting rod, a first piston arranged at one end of the connecting rod and a second piston arranged at the other end of the connecting rod, the first piston is slidably arranged in the gas chamber, the second piston is slidably arranged in the fuel chamber, the two air inlet and outlet ports of the boost pump are both arranged on the cavity wall of the gas chamber, and the first air inlet and outlet port is located on the side of the first piston away from the second piston, and the second air inlet and outlet port is located on the side of the first piston facing the second piston, and the oil inlet and outlet port of the boost pump are both arranged in the fuel chamber.

[0009] As a preferred technical solution of the dual-fuel coordinated injection system, the piston rod further includes an intermediate piston arranged on the connecting rod, the intermediate piston is located between the first piston and the second piston, and the intermediate piston is slidably arranged in the gas chamber; a third air inlet and outlet is further arranged on the cavity wall of the gas chamber, the third air inlet and outlet is arranged between the first piston and the intermediate piston, and the third air inlet and outlet and the first air inlet and outlet are connected to the same working port of the control valve;

[0010] A pressure reducing valve and a back pressure valve connected in parallel with the pressure reducing valve are arranged on a connecting pipeline between the working port of the control valve and the third air inlet and outlet.

[0011] As a preferred technical solution for the dual-fuel coordinated injection system, the back pressure valve is a first one-way valve, and the first one-way valve is configured to conduct one-way from the third air inlet and outlet to the working port of the control valve.

[0012] As a preferred technical solution of the dual-fuel coordinated injection system, it also includes a position sensor, which is used to detect the movement stroke of the piston rod.

[0013] As a preferred technical solution for the dual-fuel coordinated injection system, a second one-way valve is provided between the oil outlet of the boost pump and the oil inlet of the injector, and the second one-way valve is configured to conduct unidirectionally from the oil outlet of the boost pump to the oil inlet of the injector.

[0014] As a preferred technical solution of the dual-fuel coordinated injection system, it also includes an accumulator, the oil outlet of the fuel supply pump is connected to the oil inlet of the accumulator, and the oil outlet of the accumulator is connected to the oil inlet of the boost pump.

[0015] As a preferred technical solution for the dual-fuel coordinated injection system, a third one-way valve is provided between the oil outlet of the accumulator and the oil inlet of the boost pump, and the third one-way valve is configured to conduct one-way from the oil outlet of the accumulator to the oil inlet of the boost pump.

[0016] As a preferred technical solution for the dual-fuel coordinated injection system, the control valve is a two-position four-way electrically controlled reversing valve.

[0017] A ship, comprising a dual-fuel coordinated injection system as described in any of the above schemes.

[0018] Beneficial effects of the present invention:

[0019] The dual-fuel coordinated injection system provided by the present invention includes two groups of fuel supply components and an injector. The fuel tanks of the two groups of fuel supply components can hold different fuels. For example, one of the fuel tanks can hold commonly used diesel, and the other fuel tank can hold low-carbon fuels such as methanol, ethanol, LPG, LNG, ammonia, hydrogen, or DME. The two groups of fuel supply components can supply corresponding fuels as needed, thereby improving the flexibility of system fuel use and reducing the carbon emissions of the system; in addition, the two groups of fuel supply components share one injector, which can reduce the cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the principle of a dual-fuel coordinated injection system provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the booster pump involved in the embodiment of the present invention.

[0022] In the figure:

[0023] 10. Gas supply pump; 11. Control valve; 12. Booster pump; 121. Gas chamber; 122. Fuel chamber; 123. Connecting rod; 124. First piston; 125. Second piston; 126. Intermediate piston; 127. Position sensor; 13. Pressure reducing valve; 14. First check valve; 15. Fuel tank; 16. Fuel supply pump; 17. Accumulator; 18. Third check valve; 19. Second check valve;

[0024] 20. Injector; 30. Cylinder; 40. Controller. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] like Figure 1 and Figure 2 As shown, the present invention provides a dual-fuel coordinated injection system, including two groups of fuel supply components and an injector 20, each group of fuel supply components includes a gas supply pump 10, a control valve 11, a boost pump 12, a fuel tank 15 and a fuel supply pump 16, the air inlet of the gas supply pump 10 is connected to the air source, the air outlet of the gas supply pump 10 is connected to the air inlet of the control valve 11, the two working ports of the control valve 11 are respectively connected to the two air inlets and outlets of the boost pump 12, the oil inlet of the fuel supply pump 16 is connected to the fuel tank 15, and the oil outlet of the fuel supply pump 16 is connected to the oil inlet of the boost pump 12; the oil outlets of the boost pumps 12 in the two groups of fuel supply components are connected to the oil inlet of the injector 20, and the injector 20 can spray oil into the cylinder 30 of the engine. The fuel tanks 15 of the two sets of fuel supply assemblies can contain different fuels. For example, one of the fuel tanks 15 can contain commonly used diesel, and the other fuel tank 15 can contain low-carbon fuels such as methanol, ethanol, LPG, LNG, ammonia, hydrogen, or DME. The two sets of fuel supply assemblies can supply corresponding fuels as needed, thereby improving the flexibility of system fuel use and reducing the system's carbon emissions; the other two sets of fuel supply assemblies share an injector 20, which can reduce the cost of the system.

[0033] The boost pump 12 includes a gas chamber 121, a fuel chamber 122 and a piston rod. The piston rod includes a connecting rod 123, a first piston 124 arranged at one end of the connecting rod 123 and a second piston 125 arranged at the other end of the connecting rod 123. The first piston 124 is slidably arranged in the gas chamber 121, and the second piston 125 is slidably arranged in the fuel chamber 122. The two air inlet and outlet ports of the boost pump 12 are both arranged on the cavity wall of the gas chamber 121, and the first air inlet and outlet are located on the side of the first piston 124 away from the second piston 125, and the second air inlet and outlet are located on the side of the first piston 124 facing the second piston 125. The oil inlet and oil outlet of the boost pump 12 are both arranged in the fuel chamber 122.

[0034] When the control valve 11 is switched to the intake working position, the gas pumped by the gas supply pump 10 enters the rodless side of the gas chamber 121 through the intake working position of the control valve 11, thereby pushing the piston rod as a whole to move in the direction of the compressed fuel chamber 122, and the fuel in the fuel chamber 122 is compressed, and the compressed fuel is supplied to the injector 20, and the injector 20 injects the compressed high-pressure fuel into the cylinder 30 of the engine. When the injection is completed, the control valve 11 is switched to the exhaust working position, and the gas pumped by the gas supply pump 10 enters the rod side of the gas chamber 121 through the exhaust working position of the control valve 11, thereby pushing the piston rod as a whole to move in the direction of the compressed gas chamber 121, and the gas in the gas chamber 121 is released through the exhaust working position of the control valve 11.

[0035] Furthermore, the piston rod also includes an intermediate piston 126 arranged on the connecting rod 123, the intermediate piston 126 is located between the first piston 124 and the second piston 125, the intermediate piston 126 is slidably arranged in the gas chamber 121, and a third air inlet and outlet is also arranged on the gas chamber 121, the third air inlet and outlet is arranged on the cavity wall of the gas chamber 121 between the first piston 124 and the intermediate piston 126, the third air inlet and outlet are connected to the same working port of the control valve 11 with the first air inlet and outlet; a pressure reducing valve 13 and a back pressure valve connected in parallel with the pressure reducing valve 13 are arranged on the connecting pipeline between the working port of the control valve 11 and the third air inlet and outlet.

[0036] When the control valve 11 is in the air intake position, the gas pumped by the gas supply pump 10 not only enters the side of the first piston 124 of the gas chamber 121 away from the intermediate piston 126 through the first air inlet and outlet, but also enters the side of the first piston 124 of the gas chamber 121 facing the intermediate piston 126 through the third air inlet and outlet after being reduced in pressure by the pressure reducing valve 13, thereby playing a role of buffering and protecting the movement of the piston rod. When the control valve 11 is switched to the deflation operation, the gas on the side of the first piston 124 in the gas chamber 121 away from the intermediate piston 126 is released through the first air inlet and outlet and the deflation position of the control valve 11, and at the same time, the gas between the first piston 124 and the intermediate piston 126 in the gas chamber 121 is released from the deflation position of the control valve 11 after passing through the third air inlet and outlet and the back pressure valve. The back pressure valve is provided to play a role of buffering and protecting the movement of the piston rod. Preferably, the back pressure valve is a first one-way valve 14 , and the first one-way valve 14 is configured to conduct one-way from the third air inlet and outlet to the working port of the control valve 11 .

[0037] In this embodiment, the control valve 11 is a two-position four-way electrically controlled reversing valve. The control valves 11 in the two fuel supply assemblies are electrically connected to the controller 40, and the controller 40 can control the reversing of the control valve 11. Of course, the type of the control valve 11 is not limited to this embodiment, and can also be any other control valve 11 that can achieve the same function. In addition, a position sensor 127 is also provided on the boost pump 12. The position sensors 127 in the two fuel supply assemblies are electrically connected to the controller 40. The position sensor 127 is used to detect the movement stroke of the piston rod and to achieve closed-loop control of the boost process.

[0038] In this embodiment, preferably, a second one-way valve 19 is provided between the oil outlet of the boost pump 12 and the oil inlet of the injector 20, and the second one-way valve 19 is configured to conduct one-way from the oil outlet of the boost pump 12 to the oil inlet of the injector 20. By providing the second one-way valve 19, the oil in the injector 20 can be prevented from flowing back.

[0039] The dual-fuel coordinated injection system provided in this embodiment also includes an accumulator 17, the oil outlet of the fuel supply pump 16 is connected to the oil inlet of the accumulator 17, and the oil outlet of the accumulator 17 is connected to the oil inlet of the boost pump 12. By providing the accumulator 17, a certain amount of fuel can be stored to avoid fuel supply interruption. Preferably, a third one-way valve 18 is provided between the oil outlet of the accumulator 17 and the oil inlet of the boost pump 12, and the third one-way valve 18 is configured to be unidirectional from the oil outlet of the accumulator 17 to the oil inlet of the boost pump 12. By providing the third one-way valve 18, the oil in the fuel chamber 122 can be prevented from flowing back.

[0040] An embodiment of the present invention further provides a ship, comprising the dual-fuel coordinated injection system as described above.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Dual fuel coordinated injection system, characterized in that: include: Two groups of fuel supply components, each group of the fuel supply components comprises a gas supply pump (10), a control valve (11), a booster pump (12), a fuel tank (15) and a fuel supply pump (16); the air inlet of the gas supply pump (10) is connected to a gas source, the air outlet of the gas supply pump (10) is connected to the air inlet of the control valve (11), the two working ports of the control valve (11) are respectively connected to the two air inlet and outlet ports of the booster pump (12), the oil inlet of the fuel supply pump (16) is connected to the fuel tank (15), and the oil outlet of the fuel supply pump (16) is connected to the oil inlet of the booster pump (12); An injector (20), wherein the oil outlets of the boost pumps (12) in the two groups of the fuel supply assemblies are both connected to the oil inlet of the injector (20), and the injector (20) is capable of injecting oil into the cylinder (30) of the engine; The booster pump (12) comprises a gas chamber (121), a fuel chamber (122) and a piston rod, wherein the piston rod comprises a connecting rod (123), a first piston (124) arranged at one end of the connecting rod (123) and a second piston (125) arranged at the other end of the connecting rod (123), wherein the first piston (124) is slidably arranged in the gas chamber (121), and the second piston (125) is slidably arranged in the fuel chamber (122), and the two air inlets and outlets of the booster pump (12) are both arranged on the cavity wall of the gas chamber (121), wherein the first air inlet and outlet are located on a side of the first piston (124) away from the second piston (125), and the second air inlet and outlet are located on a side of the first piston (124) facing the second piston (125), and the oil inlet and oil outlet of the booster pump (12) are both arranged in the fuel chamber (122); The piston rod further comprises an intermediate piston (126) arranged on the connecting rod (123), the intermediate piston (126) being located between the first piston (124) and the second piston (125), and the intermediate piston (126) being slidably arranged in the gas chamber (121); a third gas inlet and outlet is further arranged on the chamber wall of the gas chamber (121), the third gas inlet and outlet being arranged between the first piston (124) and the intermediate piston (126), and the third gas inlet and outlet being connected to the same working port of the control valve (11) as the first gas inlet and outlet; A pressure reducing valve (13) and a back pressure valve connected in parallel with the pressure reducing valve (13) are provided on the connecting pipeline between the working port of the control valve (11) and the third air inlet and outlet.

2. The dual fuel coordinated injection system according to claim 1, characterized in that: The back pressure valve is a first one-way valve (14), and the first one-way valve (14) is configured to conduct one-way from the third air inlet and outlet to the working port of the control valve (11).

3. The dual fuel coordinated injection system according to any one of claims 1-2, characterized in that: It also includes a position sensor (127), wherein the position sensor (127) is used to detect the movement stroke of the piston rod.

4. The dual fuel coordinated injection system according to claim 1, characterized in that: A second one-way valve (19) is provided between the oil outlet of the boost pump (12) and the oil inlet of the injector (20), and the second one-way valve (19) is configured to conduct one-way from the oil outlet of the boost pump (12) to the oil inlet of the injector (20).

5. The dual fuel coordinated injection system according to claim 1, characterized in that: It also includes an accumulator (17), the oil outlet of the fuel supply pump (16) is connected to the oil inlet of the accumulator (17), and the oil outlet of the accumulator (17) is connected to the oil inlet of the boost pump (12).

6. The dual fuel coordinated injection system according to claim 5, characterized in that: A third one-way valve (18) is provided between the oil outlet of the accumulator (17) and the oil inlet of the booster pump (12), and the third one-way valve (18) is configured to conduct one-way from the oil outlet of the accumulator (17) to the oil inlet of the booster pump (12).

7. The dual fuel coordinated injection system according to claim 1, characterized in that: The control valve (11) is a two-position four-way electrically controlled directional valve.

8. A vessel, characterized in that It comprises a dual fuel coordinated injection system as described in any one of claims 1-7.

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