Fuel supply device for marine methanol engine

Abstract

The application discloses a marine methanol engine fuel supply device, which comprises a methanol storage tank, a methanol supply skid-mounted unit, a methanol delivery unit, a collecting tank, a delivery pump and a PLC controller, the methanol supply skid-mounted unit comprises a pressurizing pump, a pressure regulating valve, a filter, an air blower and a plurality of two-way electromagnetic valves which are arranged in a methanol supply skid-mounted shell, the methanol delivery unit comprises a two-way electromagnetic valve, a methanol fuel common rail pipe and a second manual valve, and signal lines of the PLC controller are connected with control ends of the two-way electromagnetic valves, a control end of the pressurizing pump, an inner cavity pressure sensor and an outer cavity pressure sensor of the methanol fuel common rail pipe respectively. The application improves the utilization rate of methanol fuel, ensures the safe operation of the marine methanol engine, further saves the use cost of methanol fuel and effectively avoids the poisoning risk caused by methanol fuel leakage.

Description

TECHNICAL FIELD

[0001] The application relates to a new energy engine, in particular to a fuel supply device of a methanol engine for ships, and belongs to the technical field of new energy engines. BACKGROUND

[0002] As a carbon-neutral clean energy, methanol fuel significantly reduces harmful substances generated by combustion compared with oil combustion, and is increasingly widely used in the field of ship engine. Global major ship engine manufacturers are actively promoting the research and development of methanol fuel engines to seize the market of methanol fuel engines for ships. Since methanol has certain toxicity, its safety during application is crucial. Therefore, it is urgent to provide a fuel supply device of a methanol engine for ships to solve the safety problem of fuel supply of the methanol engine and promote the low-carbon development of ship transportation. SUMMARY

[0003] The purpose of the application is to provide a fuel supply device of a methanol engine for ships, which can not only meet the safe and stable operation of the methanol engine, but also has the functions of methanol fuel leakage monitoring and security.

[0004] The application is implemented by the following technical scheme:

[0005] A fuel supply device of a methanol engine for ships, comprising a methanol storage tank, a methanol supply skid unit, a methanol delivery unit, a collection tank, a delivery pump and a PLC controller, the methanol supply skid unit comprising a pressure pump, a pressure regulating valve, a filter, an air blower and a plurality of two-way electromagnetic valves arranged in a methanol supply skid shell, the pressure pump input pipeline being connected with the methanol storage tank, the pressure regulating valve being connected in parallel at both ends between the pressure pump input pipeline and the pressure pump output pipeline, the pressure pump output pipeline being sequentially connected with the filter, the first two-way electromagnetic valve and the fourth two-way electromagnetic valve and then connected with the methanol delivery unit; the connection point of the first two-way electromagnetic valve and the fourth two-way electromagnetic valve is connected with the third two-way electromagnetic valve in parallel and then connected with the collection tank through a methanol delivery pipeline; a nitrogen delivery pipeline of a nitrogen input A port is connected in parallel with the connection point of the fifth two-way electromagnetic valve and the sixth two-way electromagnetic valve through the second two-way electromagnetic valve; a nitrogen backflow B port is connected with the other end of the fifth two-way electromagnetic valve through a nitrogen delivery pipeline; the methanol supply skid shell is provided with a shell drainage groove inclined to the middle at the bottom of both ends, the low ends of the shell drainage grooves are respectively communicated with both sides of a shell leakage methanol fuel collection port in the center of the bottom of the methanol supply skid shell, and a first manual valve of the shell leakage methanol fuel collection port is connected with the collection tank through a leakage pipeline;

[0006] The methanol delivery unit comprises a seventh two-way electromagnetic valve, a methanol fuel common rail pipe and a second manual valve, the outer pipe bottom of the methanol fuel common rail pipe is provided with a common rail pipe drainage groove which is inclined to one end, the methanol fuel common rail pipe is provided with a leakage methanol fuel collecting pipe at one end, the low end of the common rail pipe drainage groove is communicated with one end of the leakage methanol fuel collecting pipe, the second manual valve at the other end of the leakage methanol fuel collecting pipe is communicated with a collecting tank through a leakage pipeline, the methanol delivery pipeline of the collecting tank is communicated with a methanol storage tank through a delivery pump; the air supply pipeline of the air supply C port is connected with an air supply fan in the methanol supply skid unit and then communicated with one end of the outer cavity of the methanol fuel common rail pipe, the other end of the sixth two-way electromagnetic valve in the methanol supply skid unit is connected with the other end of the fourth two-way electromagnetic valve through the methanol delivery pipeline and then communicated with one end of the inner cavity of the methanol fuel common rail pipe, the other end of the inner cavity of the methanol fuel common rail pipe is connected with one end of the seventh two-way electromagnetic valve through the methanol delivery pipeline, the other end of the seventh two-way electromagnetic valve is connected with the other end of the third two-way electromagnetic valve in the methanol supply skid unit through the methanol delivery pipeline and then communicated with the collecting tank.

[0007] The signal lines of the PLC controller are connected with the control ends of the two-way electromagnetic valves, the control end of the pressurizing pump, the inner cavity pressure sensor of the methanol fuel common rail pipe and the outer cavity pressure sensor of the methanol fuel common rail pipe respectively.

[0008] The purpose of the application can also be further achieved by the following technical measures.

[0009] Further, the shell leakage methanol fuel collecting port is connected with a first liquid level meter, the leakage methanol fuel collecting pipe is connected with a second liquid level meter, and the methanol fuel liquid surface high position of the collecting tank is connected with a third liquid level meter; the pressurizing pump output pipeline is connected with a first pressure gauge, and the outer cavity of the methanol fuel common rail pipe is connected with a second pressure gauge.

[0010] Further, the highest pump pressure P1 of the pressurizing pump is 6.5 Mpa, and the maximum flow L1 is 50 L / min; the highest pump pressure P2 of the delivery pump is 0.1 Mpa, and the maximum flow L2 is 16 L / min.

[0011] Further, the inclination angles of the drainage grooves of the shell and the common rail pipe are both 4°-6°.

[0012] Further, the negative pressure established in the outer cavity of the methanol fuel common rail pipe by the air supply fan is 0.5 kPa.

[0013] Further, the filtering precision of the filter is 0.01-0.1 μm.

[0014] This invention employs a combination of several two-way solenoid valves connected together to deliver methanol fuel into the inner cavity of the methanol fuel common rail. An induced draft fan establishes negative pressure in the outer cavity of the methanol fuel common rail, facilitating the extraction of leaked methanol fuel from the inner cavity. Furthermore, this invention collects leaked methanol fuel from the lower side of the methanol supply skid-mounted unit housing and the lower side of the methanol fuel common rail into a collection tank, ensuring the safe operation of marine methanol engines, further reducing methanol fuel usage costs, improving methanol fuel utilization, effectively mitigating the risk of poisoning caused by methanol fuel leaks, and facilitating the low-cost conversion of existing marine diesel engines into marine methanol engines.

[0015] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of the present invention. Detailed Implementation

[0017] The invention will be further described below with reference to the accompanying drawings and embodiments of a marine medium-speed (300rpm≤n≤1000rpm) methanol engine.

[0018] like Figure 1 As shown, this embodiment includes a methanol storage tank 1, a methanol supply skid-mounted unit 2, a methanol conveying unit 3, a collection tank 4, a conveying pump 5, and a PLC controller 6. The methanol supply skid-mounted unit 2 includes a pressurizing pump 22, a pressure regulating valve 23, a filter 24, an induced draft fan 25, and several two-way solenoid valves, all housed within a cylindrical methanol supply skid-mounted housing 21. The pressurizing pump input pipe 221 is connected to the methanol storage tank 1. The two ends of the pressure regulating valve 23 are connected in parallel between the pressurizing pump input pipe 221 and the pressurizing pump output pipe 222. By adjusting the backflow pressure of the pressure regulating valve 23, the methanol fuel supply pressure output by the pressurizing pump 22 can be adjusted within the range of 1 to 5 MPa.

[0019] The pressurization pump output pipe 222 is sequentially connected to the filter 24, the first two-way solenoid valve 261, and the fourth two-way solenoid valve 264, which are connected to the methanol delivery unit 3. The filter 24 has a filtration accuracy of 0.01 to 0.1 μm and is used to filter impurities in methanol fuel. The pressure can be displayed locally by the first pressure gauge 81. If the pressure rises due to the blockage of the filter 24, the pressure signal is wirelessly transmitted to the PLC controller 6 in real time. The PLC controller 6 issues an alarm signal to facilitate timely maintenance by maintenance personnel.

[0020] The connection point of the first two-way electromagnetic valve 261 and the fourth two-way electromagnetic valve 264 is connected to the collecting tank 4 through the methanol delivery pipeline 27 after being connected to the third two-way electromagnetic valve 263. The nitrogen delivery pipeline 282 of the nitrogen input A port 281 is connected to the connection point of the fifth two-way electromagnetic valve 265 and the sixth two-way electromagnetic valve 266 through the second two-way electromagnetic valve 262, and the nitrogen backflow B port 283 is connected to the other end of the fifth two-way electromagnetic valve 265 through the nitrogen delivery pipeline 282. The methanol supply pry-mounted shell 21 is provided with a shell drainage groove 211 inclined to the middle at the bottom of each end, the low end of the shell drainage groove 211 is communicated with the shell leakage methanol fuel collection port 212 on the two sides of the central bottom of the methanol supply pry-mounted shell 21, and the first manual valve 213 of the shell leakage methanol fuel collection port 212 is connected to the collecting tank 4 through the leakage pipeline 214.

[0021] The methanol delivery unit 3 comprises a seventh two-way electromagnetic valve 267, a methanol fuel common rail pipeline 31 and a second manual valve 32. The outer pipeline 311 of the methanol fuel common rail pipeline 31 is provided with a common rail pipeline drainage groove 312 inclined to one end at the bottom, and the methanol fuel common rail pipeline 31 is provided with a leakage methanol fuel collection pipeline 313 at one end. The low end of the common rail pipeline drainage groove 312 is communicated with one end of the leakage methanol fuel collection pipeline 313, the second manual valve 32 of the other end of the leakage methanol fuel collection pipeline 313 is connected to the collecting tank 4 through the leakage pipeline 214, and the methanol delivery pipeline 27 of the collecting tank 4 is connected to the methanol storage tank 1 through the delivery pump 5. The inclination angles of the shell drainage groove 211 and the common rail pipeline drainage groove 312 in the embodiment are both 5°. ° , which facilitates the collection and flow of leaked methanol fuel into the collecting tank 4 。 The air supply pipeline 291 of the air supply C port 29 is connected to the outer cavity 314 of the methanol fuel common rail pipeline 31 at one end after being connected to the air blower 25 in the methanol supply pry-mounted unit 2, the air blower 25 establishes a negative pressure of 0.5 kPa in the outer cavity 314 of the methanol fuel common rail pipeline 31, which facilitates the suction of leaked methanol fuel in the inner cavity 315 of the methanol fuel common rail pipeline 31.

[0022] The other end of the sixth two-way electromagnetic valve 266 in the methanol supply pry-mounted unit 2 is connected to the other end of the fourth two-way electromagnetic valve 264 through the methanol delivery pipeline 27, and then connected to one end of the inner cavity 315 of the methanol fuel common rail pipeline 31. The other end of the inner cavity 315 of the methanol fuel common rail pipeline 31 is connected to one end of the seventh two-way electromagnetic valve 267 through the methanol delivery pipeline 27, and the other end of the seventh two-way electromagnetic valve 267 is connected to the other end of the third two-way electromagnetic valve 263 in the methanol supply pry-mounted unit 2 through the methanol delivery pipeline 27, and then connected to the collecting tank 4.

[0023] The signal line 61 of the PLC controller 6 is connected to the control end of each two-way electromagnetic valve, the control end of the pressurizing pump 22, the inner cavity pressure sensor 316 of the methanol fuel common rail pipeline 31 and the outer cavity pressure sensor 317 of the methanol fuel common rail pipeline 31.

[0024] The shell leaks the methanol fuel collection port 212 by the first liquid level meter 71, the leakage methanol fuel collection pipe 313 by the second liquid level meter 72, and the methanol fuel liquid level of the collection tank 4 by the third liquid level meter 73. The pressurized pump output pipe 222 by the first pressure gauge 81, and the outer cavity 315 of the methanol fuel common rail pipe 31 by the second pressure gauge 82. The third liquid level meter 73 locally displays the liquid level of the recovered methanol fuel in the collection tank 4, and is wirelessly transmitted to the PLC controller 6 in real time. When the methanol fuel in the collection tank 4 reaches the highest liquid level, the PLC controller 6 sends an alarm signal, and at this time, the recovered methanol fuel is transmitted to the methanol fuel storage tank 1 by the delivery pump 5.

[0025] The highest pump pressure P1 of the pressurized pump 22 is 6.5Mpa, and the maximum flow L1 is 50L / min. The highest pump pressure P2 of the delivery pump 5 is 0.1Mpa, and the maximum flow L2 is 16L / min.

[0026] When the methanol engine is working, the induced draft fan 25 is started immediately, and the outer cavity 314 of the methanol fuel common rail pipe 31 maintains a negative pressure of 0.5kpa.

[0027] When the methanol fuel in the inner cavity 315 of the methanol fuel common rail pipe 31 leaks to the outer cavity 314, it can be locally displayed by the second liquid level meter 72, and wirelessly transmitted to the PLC controller 6 at the same time. The PLC controller 6 sends an alarm signal, and the operator opens the second manual valve 32 to collect the leaked methanol fuel into the collection tank 4.

[0028] When the methanol engine is stopped, the PLC controller 6 instructs to open the second two-way electromagnetic valve 262, the sixth two-way electromagnetic valve 266, and the seventh two-way electromagnetic valve 267, respectively. The external 0.2-0.3Mpa high-pressure nitrogen gas enters from the nitrogen input A port 281, passes through the second two-way electromagnetic valve 262 and the sixth two-way electromagnetic valve 266 in turn, enters the inner cavity 315 of the methanol fuel common rail pipe 31, and the remaining methanol fuel in the methanol fuel common rail pipe enters the collection tank 4 through the seventh two-way electromagnetic valve 267. After 30 seconds, the PLC controller 6 instructs to open the second two-way electromagnetic valve 264 and the third two-way electromagnetic valve 263, blows the residual methanol fuel in the pipeline into the collection tank 4, closes the sixth two-way electromagnetic valve 266, opens the fifth two-way electromagnetic valve 265, and the high-pressure nitrogen gas returns to the nitrogen tank through the related pipeline of the nitrogen backflow B port 283. At this time, all the two-way electromagnetic valves are closed.

[0029] In addition to the above-mentioned embodiments, the present application can also have other implementation manners, and any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope of the present application.

Claims

1. A fuel supply device for a marine engine using methanol, characterized by comprising: The methanol storage tank, the methanol supply pry unit, the methanol delivery unit, the collection tank, the delivery pump and the PLC controller are included, the methanol supply pry unit includes the pressure pump, the pressure regulating valve, the filter, the air blower and several two-way electromagnetic valves arranged in the methanol supply pry shell, the pressure pump input pipeline is connected with the methanol storage tank, the pressure regulating valve is connected in parallel at both ends between the pressure pump input pipeline and the pressure pump output pipeline, the pressure pump output pipeline is sequentially connected with the filter, the first two-way electromagnetic valve, the fourth two-way electromagnetic valve and then connected with the methanol delivery unit; the connecting point of the first two-way electromagnetic valve and the fourth two-way electromagnetic valve is connected with the third two-way electromagnetic valve in parallel and then connected with the collection tank through the methanol delivery pipeline; the nitrogen delivery pipeline of the nitrogen input A port is connected with the connecting point of the fifth two-way electromagnetic valve and the sixth two-way electromagnetic valve through the second two-way electromagnetic valve in parallel; the nitrogen backflow B port is connected with the other end of the fifth two-way electromagnetic valve through the nitrogen delivery pipeline; the methanol supply pry shell is provided with the shell drainage groove inclined to the middle at the bottom of both ends, the low end of the shell drainage groove is communicated with both sides of the shell leakage methanol fuel collection port in the middle of the bottom of the methanol supply pry shell, and the first manual valve of the shell leakage methanol fuel collection port is connected with the collection tank through the leakage pipeline; The methanol delivery unit includes the seventh two-way electromagnetic valve, the methanol fuel common rail pipe and the second manual valve, the outer pipe bottom of the methanol fuel common rail pipe is provided with the common rail pipe drainage groove inclined to one end, the low end of the methanol fuel common rail pipe drainage groove is provided with the leakage methanol fuel collection pipe, the low end of the common rail pipe drainage groove is communicated with one end of the leakage methanol fuel collection pipe, the second manual valve of the other end of the leakage methanol fuel collection pipe is connected with the collection tank through the leakage pipeline, and the methanol delivery pipeline of the collection tank is connected with the methanol storage tank through the delivery pump; the air supply pipeline of the air supply C port is connected with the air blower arranged in the methanol supply pry unit and then connected with one end of the outer cavity of the methanol fuel common rail pipe, the other end of the sixth two-way electromagnetic valve in the methanol supply pry unit is connected with the other end of the fourth two-way electromagnetic valve through the methanol delivery pipeline and then connected with one end of the inner cavity of the methanol fuel common rail pipe, the other end of the inner cavity of the methanol fuel common rail pipe is connected with one end of the seventh two-way electromagnetic valve through the methanol delivery pipeline, and the other end of the seventh two-way electromagnetic valve is connected with the other end of the third two-way electromagnetic valve in the methanol supply pry unit through the methanol delivery pipeline and then connected with the collection tank; The signal line of the PLC controller is communicated with the control end of each two-way electromagnetic valve, the control end of the pressure pump, the inner cavity pressure sensor of the methanol fuel common rail pipe and the outer cavity pressure sensor of the methanol fuel common rail pipe; The shell leakage methanol fuel collection port is connected with the first liquid level meter in parallel, the leakage methanol fuel collection pipe is connected with the second liquid level meter in parallel, and the methanol fuel liquid surface high position of the collection tank is connected with the third liquid level meter in parallel; the pressure pump output pipeline is connected with the first pressure gauge in parallel, and the outer cavity of the methanol fuel common rail pipe is connected with the second pressure gauge in parallel; The highest pump pressure P1 of the pressure pump is 6.5 Mpa, and the maximum flow L1 is 50 L / min; the highest pump pressure P2 of the delivery pump is 0.1 Mpa, and the maximum flow L2 is 16 L / min.

2. The marine engine fuel supply apparatus according to claim 1, wherein The inclination angle of the shell drainage groove and the inclination angle of the common rail pipe drainage groove are both 4°-6°.

3. The marine engine fuel supply apparatus for methanol as claimed in claim 1, wherein The air suction fan establishes 0.5kPa negative pressure in the outer cavity of the methanol fuel common rail pipe.

4. The marine engine fuel supply apparatus according to claim 1, wherein The filter has a filtering precision of 0.01-0.1 microns.

Images