Methanol fuel leakproof device of marine methanol engine

Abstract

The utility model discloses a methanol fuel leakproof device of a marine methanol engine, which is characterized in that the output end of a methanol storage tank is sequentially connected with a methanol delivery pump, a methanol filter and an inner pipe at one end of a methanol double-wall pipe, and the inner pipe is respectively connected with a methanol ejector of each cylinder of the marine methanol engine in a bypass manner; and an inner pipe at the other end of the methanol double-wall pipe is connected with a methanol storage tank. An outer pipe of the methanol double-wall pipe is connected with the upper part of the heating water tank through a water feeding pipe, and one end of a water discharging pipe is connected with the lower part of the heating water tank and then bypasses the outer pipe of the methanol double-wall pipe through a gear pump and an isolation water filter in sequence. A detection pipe of the methanol monitor extends into the upper end of the heating water tank, and the methanol monitor is electrically connected with the machine belt alarm device and the PLC through signal lines. The marine methanol engine is compact in structure, multiple protection measures are adopted, and operation safety of the marine methanol engine is guaranteed.

Description

Technical Field

[0001] The utility model relates to a marine methanol engine security system, in particular to a device for preventing methanol leakage and ensuring the safe operation of the methanol engine, belonging to the technical field of marine clean energy engines. Background Art

[0002] In recent years, methanol, as a clean energy source, has become increasingly popular among major marine engine manufacturers, and its application is becoming increasingly widespread. Methanol has a boiling point of 65°C and can mix with water in any proportion. Methanol gas is highly flammable and can explode when exposed to high temperatures and open flames. Methanol gas is heavier than air and can spread very far at low altitudes. Methanol is also highly toxic and easily absorbed through the gastrointestinal tract, respiratory tract, and skin, causing acute poisoning with symptoms such as headache, dizziness, fatigue, drowsiness, and mild impaired consciousness, while more severe symptoms include coma and epileptic seizures, leading to death. The methanol fuel supply system for marine methanol engines is a high-risk area for methanol leaks. The consequences of a methanol leak would be devastating. Utility Model Content

[0003] The utility model aims to provide a methanol fuel leakage prevention device for a marine methanol engine which has a compact structure, is easy to operate and safe to use.

[0004] The utility model is achieved through the following technical solutions:

[0005] A methanol fuel leakage prevention device for a marine methanol engine comprises a methanol storage tank, a methanol delivery pump, a methanol filter, a methanol double-wall pipe, a heating water tank, a gear pump, an isolation water filter, a methanol monitor, a PLC controller and an engine belt alarm device. The output end of the methanol storage tank is connected to the methanol delivery pump and the input end of the methanol filter in sequence through pipelines. The output end of the methanol filter is connected to the inner pipe at one end of the methanol double-wall pipe. The inner pipe of the methanol double-wall pipe is respectively connected to the methanol injector of each cylinder of the marine methanol engine. The inner pipe at the other end of the methanol double-wall pipe is connected to the methanol storage tank; the outer pipe at the other end of the methanol double-wall pipe is connected to one end of an upper water pipe, and the other end of the upper water pipe is connected to the upper input end of the heating water tank; one end of the lower water pipe is connected to the lower output end of the heating water tank and then connected to the outer pipe of the methanol double-wall pipe near the output end of the methanol filter in sequence through the gear pump and the isolation water filter; the detection pipe of the methanol monitor extends into the upper end of the heating water tank, and the methanol monitor is respectively electrically connected to the engine belt alarm device and the PLC controller through signal lines.

[0006] The purpose of the utility model can be further achieved by the following technical measures.

[0007] Furthermore, the outer surface of the inner tube of the methanol double-wall tube is coated with a PTFE hydrophobic and breathable coating.

[0008] Furthermore, the methanol delivery pump is a centrifugal pump, and the lift of the centrifugal pump is 50 meters.

[0009] Furthermore, the working pressure of the gear pump is P=3.0-4.0 MPa.

[0010] Furthermore, the methanol filter and the isolation water filter are both double filters, and the filter pore density of the double filter is 900-1100 mesh / m 2 .

[0011] Furthermore, a resistance heating wire is provided at the bottom of the heating water tank, the power range of the resistance heating wire is: 4.5~5.5kW, and the water temperature range of the heating water tank is 75℃~85℃.

[0012] The methanol double-wall pipe of the utility model uses an inner pipe to transport methanol fuel at a pressure of 1.0Mpa through a methanol delivery pump, and the annular cavity between the outer pipe and the inner pipe transports circulating isolated hot water at a pressure of 75℃ to 85℃ at a pressure of 0.3Mpa through a gear pump. When the methanol fuel leaks from the inner pipe of the methanol double-wall pipe into the high-temperature isolated water in the annular cavity between the outer pipe and the inner pipe, the methanol fuel is dissolved in the high-temperature isolated water due to boiling and vaporization, preventing large-scale leakage of methanol gas. Under the combined effect of the PTFE hydrophobic and breathable coating on the outer surface of the inner pipe and the higher pressure of the methanol fuel in the inner pipe than the pressure of the high-temperature isolated water in the annular cavity between the outer pipe and the inner pipe, the high-temperature isolated water is effectively prevented from entering the inner pipe of the methanol double-wall pipe through the leakage of the inner pipe. When the isolated water containing methanol fuel circulates into the heating water tank, the methanol evaporates into gas under the heating effect of the 75℃ to 85℃ water. If the methanol concentration is higher than 50mg / m 3 If the methanol fuel is not fully absorbed, it will be detected by the methanol detector on the heating water tank. The detection signal from the methanol detector is transmitted to the PLC controller, which immediately shuts down the electric methanol pump and the float-type hydraulic control valve on the heating water tank, cutting off the passage of methanol fuel into the methanol double-wall pipe and shutting down the marine methanol engine. Simultaneously, the engine belt alarm device is activated and an alarm is also sent to the control room. This utility model has a compact structure and adopts multiple protection measures to ensure the safe operation of the marine methanol engine.

[0013] Advantages and features of the present invention will be illustrated and explained through the following non-limiting description of preferred embodiments, which are given as examples only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a simplified structural diagram of the utility model;

[0015] Figure 2 yes Figure 1 A magnified view of part I;

[0016] Figure 3It is a three-dimensional diagram of the heating water tank. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 As shown, the utility model includes a methanol storage tank 1, a methanol delivery pump 2, a methanol filter 3, a methanol double-wall pipe 4, a heating water tank 5, a gear pump 6, an isolation water filter 7, a methanol monitor 81, a PLC controller 82 and an engine belt alarm device 83. The output end of the methanol storage tank 1 is connected to the input end of the methanol delivery pump 2 and the methanol filter 3 in sequence through a pipeline 11. The output end of the methanol filter 3 is connected to the inner pipe 41 at one end of the methanol double-wall pipe 4. The inner pipe 41 of the methanol double-wall pipe 4 is respectively connected to the methanol injector 10 of each cylinder 20 of the marine methanol engine. The inner pipe 41 at the other end of the methanol double-wall pipe 4 is connected to the methanol storage tank 1. Methanol fuel is as follows Figure 1 The direction indicated by the hollow arrow passes sequentially through the methanol delivery pump 2, the methanol filter 3, and the methanol double-walled pipe 4, starting from the bottom of the methanol storage tank 1 and returning to the methanol storage tank 1. The outer pipe 42 at the other end of the methanol double-walled pipe 4 is connected to one end of the upper water pipe 51, and the other end of the upper water pipe 51 is connected to the upper input end 511 of the heating water tank 5. The lower water pipe 52 is connected to the lower output end 521 of the heating water tank 5 and then connected to the outer pipe 42 of the methanol double-walled pipe 4 near the output end of the methanol filter 3 through the gear pump 6 and the isolation water filter 7. The detection tube 811 of the methanol monitor 81 extends into the upper end of the heating water tank 5. The methanol monitor 81 is electrically connected to the PLC controller 82 and the machine belt alarm device 83 via signal lines 84.

[0019] like Figure 2 As shown, the outer surface of the inner tube 41 of the methanol double-walled tube 4 is coated with a PTFE (polytetrafluoroethylene) hydrophobic breathable coating 43. The PTEE hydrophobic breathable coating 43 has relatively strong hydrophobicity and can prevent water from passing through the PTEE hydrophobic breathable coating 43, while the PTEE hydrophobic breathable coating 43 allows gas molecules to pass through. Methanol gas particles are relatively small and can follow the PTEE hydrophobic breathable coating 43 capillary to the other side of the PTEE hydrophobic breathable coating 43, while the isolation water particles are relatively large and have a larger surface tension and cannot reach the other side of the PTEE hydrophobic breathable coating 43. Once the inner tube 41 of the methanol double-walled tube 4 leaks, the methanol fuel can pass through the PTFE water-transmitting breathable coating 43 into the isolation water in the annular cavity between the outer tube 42 and the inner tube 41. The isolation water will flow along the Figure 1 The direction indicated by the middle arrow returns to the heating water tank 5.

[0020] like Figure 3As shown, the heating water tank 5 of this embodiment is a cylindrical tank with a diameter of 600 mm, a height of 900 mm, and a capacity of 250 liters. The outer circumference of the hot water tank 5 is provided with an upper input port 511 for connecting to the upper water pipe 51 and a lower output port 521 for connecting to the lower water pipe 52. Losses occur during the circulation, filtration, and heating of the isolation water. A float-type hydraulically controlled valve 53 is installed within the heating water tank 5. When the water level falls below 200 liters, the float-type hydraulically controlled valve 53 automatically opens to replenish water from the expansion tank of the marine methanol engine. When the water level reaches 250 liters, the float-type hydraulically controlled valve 53 automatically closes, stopping the replenishment. A drain port 54 connected to an external stop valve 55 is also provided at the bottom of the hot water tank 5. In the event of a methanol fuel leak, the stop valve 55 on the drain port 54 is opened to drain the isolation water containing methanol in the heating water tank 5 before the methanol leak from the double-walled methanol pipe 4 can be addressed.

[0021] A resistance heating wire 56 is provided at the bottom of the heating water tank 5. The power of the resistance heating wire 56 in this embodiment is 5 kW, and the water temperature range of the heating water tank is 75°C to 85°C.

[0022] The methanol delivery pump 2 of this embodiment is a centrifugal pump with a lift of 50 meters. The working pressure of the gear pump 6 is P = 3.5 MPa. The methanol filter 3 and the isolation water filter 7 are both double filters, and the filter pore density of the double filter is 1000 mesh / m 2 .

[0023] When the methanol fuel in the inner tube 41 of the methanol double-walled tube 4 leaks into the annular cavity between the outer tube 42 and the inner tube 41, the methanol fuel boils and vaporizes due to the 80°C isolation water. Due to the pressure difference between the 1.0 MPa pressure of the methanol fuel in the inner tube 41 and the 0.3 MPa pressure of the circulating isolation hot water in the annular cavity between the outer tube 42 and the inner tube 41, and the membrane formed by the PTFE hydrophobic and breathable coating 43, the isolation water is prevented from entering the inner tube 41 of the methanol double-walled tube 4 through the leakage point, effectively preventing the isolation water from entering the cylinder of the marine methanol engine, ensuring the safe operation of the marine methanol engine.

[0024] When the isolation water containing methanol enters the hot water of about 80℃ in the heating water tank 5 through the water supply pipe 51, the methanol in the isolation water evaporates into gas. When the methanol concentration in the heating water tank 5 is higher than 50mg / m 3 When the methanol fuel stops entering the methanol double-wall pipe 4, the marine methanol engine stops, and the engine belt alarm device 83 is turned on, and an alarm is also sent to the control room.

[0025] After hearing the alarm, the operator put on protective clothing and went to the site for maintenance. He disconnected the switch of the resistance heating wire 56, stopped heating the isolation water in the heating water tank 5, opened the stop valve 55, and drained the isolation water containing methanol in the methanol double-walled pipe 4 and the heating water tank 5. At the same time, he drained the methanol fuel in the inner tube 41 of the methanol double-walled pipe 4 and then repaired the methanol double-walled pipe 4.

[0026] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A methanol fuel leakage prevention device for a marine methanol engine, characterized in that: It includes a methanol storage tank, a methanol delivery pump, a methanol filter, a methanol double-wall pipe, a heating water tank, a gear pump, an isolation water filter, a methanol monitor, a PLC controller and an engine belt alarm device. The output end of the methanol storage tank is connected to the methanol delivery pump and the input end of the methanol filter in sequence through a pipeline. The output end of the methanol filter is connected to the inner pipe at one end of the methanol double-wall pipe. The inner pipe of the methanol double-wall pipe is respectively connected to the methanol injector of each cylinder of the marine methanol engine. The inner pipe at the other end of the methanol double-wall pipe is connected to the methanol storage tank; the outer pipe at the other end of the methanol double-wall pipe is connected to one end of the upper water pipe, and the other end of the upper water pipe is connected to the upper input end of the heating water tank; one end of the lower water pipe is connected to the lower output end of the heating water tank and then is connected to the outer pipe of the methanol double-wall pipe near the output end of the methanol filter through the gear pump and the isolation water filter in sequence; the methanol detection pipe of the methanol monitor extends into the upper end of the heating water tank, and the methanol monitor is electrically connected to the engine belt alarm device and the PLC controller through signal lines.

2. The methanol fuel leakage prevention device for a marine methanol engine according to claim 1, characterized in that: The inner and outer surfaces of the methanol double-wall pipe are coated with PTFE hydrophobic and breathable coating.

3. The methanol fuel leakage prevention device for a marine methanol engine according to claim 1, characterized in that: The methanol delivery pump is a centrifugal pump, and the lift of the centrifugal pump is 50 meters.

4. The methanol fuel leakage prevention device for a marine methanol engine according to claim 1, characterized in that: The working pressure of the gear pump is P=3.0-4.0 MPa.

5. The methanol fuel leakage prevention device for a marine methanol engine according to claim 1, characterized in that: The methanol filter and the isolation water filter are both double filters, and the filter element pore density of the double filter is 900-1100 mesh / m 2 .

6. The methanol fuel leakage prevention device for a marine methanol engine according to claim 1, characterized in that: A resistance heating wire is provided at the bottom of the heating water tank. The power range of the resistance heating wire is 4.5-5.5kW. The water temperature range of the heating water tank is 75°C-85°C.

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