Methanol fuel supply system of ship dual-fuel generator

Abstract

The utility model discloses a methanol fuel supply system of a ship dual-fuel generator, which comprises a methanol fuel supply main pipeline, the methanol fuel supply main pipeline comprises an input pipeline and an FVT input pipeline, and a booster pump, a safety relief valve, a heat exchange system and a filter are sequentially arranged between the input pipeline and the FVT input pipeline. According to the utility model, a high-integration and compact skid-mounted design is adopted, the insufficiency of the ship space is fully considered, and under the condition that the original ship space is utilized, the methanol fuel which is free of impurities and meets the standard can be continuously and stably supplied to the FVT; and a large number of safety measures are designed, so that leakage and seepage of methanol can be effectively handled, and major harm to personnel health and driving safety caused by methanol volatilization is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of marine gas supply, in particular to a methanol fuel supply system for a marine dual-fuel generator. Background Art

[0002] Methanol can corrode metals such as aluminum alloys, galvanized steel and lead alloys, and can also swell plastics and rubber, which puts higher demands on the design and manufacture of some important parts, such as fuel injection pump parts and sealing parts. Methanol is also a toxic chemical with a low flash point and needs to be stored at low temperatures and pressures. Details such as how to fill, store and supply the main engine more safely also need to be solved.

[0003] FVT (Fuel Valve Train) is a fuel valve train unit. In the traditional field of marine gas supply technology, there is a lack of a skid that can provide FVT with a continuous and stable supply. The skid is required to continuously and stably supply FVT with methanol fuel that is free of impurities and meets the temperature and pressure requirements.

[0004] Moreover, the space on the ship is limited, and the existing feeding system structure design is unreasonable, usually non-skid design, which cannot continuously and stably supply methanol fuel. The system testing and debugging of non-skid design must be carried out on-site, and the pipelines are complex, and the three-dimensional space cannot be fully utilized, resulting in high difficulty, high cost, and long time consumption for installation. Each system is scattered and large, and it is difficult to split and relocate for use. Summary of the invention

[0005] In view of the shortcomings of the prior art, the utility model provides a methanol fuel supply system for a ship dual-fuel generator to solve the problem that methanol is not easy to add, store and supply to the main engine in the traditional method.

[0006] The technical solution of the utility model is: a methanol fuel supply system for a ship dual-fuel generator, including a methanol fuel supply main line, the methanol fuel supply main line includes an input line and an FVT input line, and a booster pump, a safety pressure relief valve, a heat exchange system and a filter are arranged in sequence between the input line and the FVT input line.

[0007] Preferably, the booster pump is a double booster pump, and two booster pumps are connected in parallel to the methanol fuel supply main pipeline.

[0008] Preferably, a pressure control system is provided between the boost pump and the safety pressure relief valve, the pressure control system comprising a methanol fuel reflux pipeline, a pressure control valve, and a pressure sensor; the connection point between the methanol fuel reflux pipeline and the methanol fuel supply main pipeline is located between the boost pump and the safety pressure relief valve; the pressure sensor is provided in the methanol fuel supply main pipeline, between the connection point between the methanol fuel reflux pipeline and the methanol fuel supply main pipeline and the safety pressure relief valve; the pressure control valve is provided in the methanol fuel reflux pipeline; and the pressure sensor and the pressure control valve are connected by a cable.

[0009] As a further preference, the safety pressure relief valve is connected to a pressure relief pipeline.

[0010] Preferably, the filter is a double filter consisting of two filters connected in parallel to the methanol fuel supply main pipeline.

[0011] Preferably, the heat exchange system comprises a No. 1 heat exchanger, a No. 1 heat exchange pipeline, a No. 2 heat exchange pipeline, a No. 2 heat exchanger, a centrifugal pump and a water-glycol expansion tank; the No. 1 heat exchange pipeline connects the No. 1 heat exchanger, the No. 2 heat exchanger, the centrifugal pump and the water-glycol expansion tank into a loop; the water-glycol expansion tanks are respectively provided with water-glycol input ports; the No. 2 heat exchange pipeline is connected to the No. 2 heat exchanger, and has a water input port and a water output port respectively; water-glycol is transferred from the water- The ethylene glycol input port flows into the water-ethylene glycol expansion tank, and then flows into the No. 2 heat exchanger through the centrifugal pump; hot water is input from the water input port to the No. 2 heat exchanger to heat the water glycol flowing through it, and then output from the water output port; the water-ethylene glycol heated by the No. 2 heat exchanger flows into the No. 1 heat exchanger, and the heated water-ethylene glycol heats the methanol flowing through the methanol supply main line. The cooled water-ethylene glycol after heat exchange flows back to the water-ethylene glycol expansion tank, and is circulated by the centrifugal pump.

[0012] As a further preference, the centrifugal pump is a double centrifugal pump, wherein two centrifugal pumps are connected in parallel into the first heat exchange pipeline.

[0013] Preferably, it also includes a residual methanol discharge system, including a nitrogen pipeline, which is connected in parallel to the methanol fuel supply main pipeline and is provided with a methanol discharge pipe, in which a diaphragm pump is provided; the nitrogen pipeline purges the residual methanol in the methanol fuel supply main pipeline and discharges the residual methanol under the negative pressure of the diaphragm pump.

[0014] As a further preferred embodiment, the residual methanol discharge system further comprises a FVT methanol reflux pipe connected in parallel upstream of the diaphragm pump, and the residual methanol in the FVT methanol reflux pipe is also discharged through the diaphragm pump.

[0015] Preferably, a connecting liquid receiving tray is also provided at the bottom of the ship dual-fuel generator methanol fuel supply system; the ship dual-fuel generator methanol fuel supply system is also provided with a safety valve control system, including a plurality of electromagnetic valves distributed in the methanol fuel supply main line including the input line.

[0016] The beneficial effects of the utility model are as follows: the utility model adopts a highly integrated and compact skid design, which fully considers the shortage of ship space and ensures that the FVT can be continuously and stably supplied with impurity-free and compliant methanol fuel while utilizing the original ship space. At the same time, since the skid can be tested and debugged in a well-equipped and advanced infield, the reliability of the system is improved and the trial and error cost is saved. And after being transported to the site, it can be directly connected to the interface for installation, which reduces the amount of on-site installation and effectively shortens the overall project cycle. The compact, smart and integrated characteristics of the skid also provide convenience for installation and migration, while making it easy to monitor its operating status, which is beneficial to navigation safety.

[0017] The dynamic equipment adopts one open and one standby, and adopts double filters; it is equipped with pressure control valves, safety pressure relief valves and pressure sensors with cables. Users can manually and remotely control the valves, and the safety pressure relief valves and pressure sensors will also detect in real time to ensure the safety of the system; nitrogen lines and diaphragm pumps are configured to purge the system to prevent methanol residue from corroding the equipment and volatilizing to cause poisoning; the heat exchange system is optimized, and heat exchangers No. 1 and No. 2 are additionally set up to heat water-ethylene glycol, and expansion tanks are set up to ensure stable, efficient and safe heat exchange; at the bottom of the system, there is also a connecting liquid receiving tray for liquid recovery steps in case of leakage, so that the system can operate sustainably, stably and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the pipeline connection relationship structure of the utility model.

[0019] Description of labels:

[0020] 1: Nitrogen pipeline; 2: Methanol fuel reflux pipeline; 3: Booster pump; 4: Input pipeline; 5: Pressure relief pipeline; 6: FVT methanol reflux pipe; 7: Methanol discharge pipeline; 8: Diaphragm pump; 9: Connecting liquid receiving tray; 10: No. 2 heat exchanger; 11: No. 2 heat exchange pipeline; 12: Centrifugal pump; 13: Water input port; 14: Water output port; 15: No. 1 heat exchange pipeline; 16: Water-ethylene glycol expansion tank; 17: Water-ethylene glycol input port; 19: FVT input pipeline; 20: Filter; 21: No. 1 heat exchanger; 22: Safety pressure relief valve; 23: Pressure sensor; 24: Cable; 25: Pressure control valve; 26: Solenoid valve; 27: ESD (emergency shut-off) valve. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, this embodiment includes a methanol fuel supply main line, which includes an input line 4 and an FVT input line 19, and a booster pump 3, a safety pressure relief valve 22, a heat exchange system and a filter 20 are sequentially arranged between the input line 4 and the FVT input line 19. The methanol fuel supply main line is mainly used to heat, pressurize and filter the methanol fuel, so as to realize a continuous and stable supply of compliant methanol fuel to the FVT.

[0023] In this embodiment, the booster pump 3 is a double booster pump 3, and two booster pumps 3 are connected in parallel to the methanol fuel supply main line. The double booster pump 3 is set, and one of the two booster pumps 3 is in operation and the other is in standby mode to prevent the whole methanol fuel supply system from being unable to work normally due to a sudden failure of the booster pump 3, and also to facilitate maintenance.

[0024] In this embodiment, a pressure control system is provided between the boost pump 3 and the safety relief valve 22, and the pressure control system includes a methanol fuel return line 2, a pressure control valve 25, and a pressure sensor 23. The connection point between the methanol fuel return line 2 and the methanol fuel supply main line is located between the boost pump 3 and the safety relief valve 22. The pressure sensor 23 is provided in the methanol fuel supply main line, between the connection point between the methanol fuel return line 2 and the methanol fuel supply main line and the safety relief valve 22. The pressure control valve 25 is provided in the methanol fuel return line 2, and the pressure sensor 23 and the pressure control valve 25 are connected by a cable 24. The pressure sensor 23 is used to detect and display the pressure of the main flow. If the pressure is too high, the control system adjusts the opening of the pressure control valve 25, and the pressure control valve 25 opens to release the pressure, and part of the methanol fuel is diverted to the methanol fuel return line 2 to reach the set value of the pressure gauge.

[0025] In this embodiment, the safety relief valve 22 is connected to the pressure relief pipeline 5. The safety relief valve 22 has an upper limit pressure, and the safety relief valve 22 will automatically open and release the pressure when the pressure in the pipeline is too high.

[0026] In this embodiment, the filter 20 is a double filter 20, which is connected in parallel to the main methanol fuel supply line. The double filter 20 is set up, and one of the two filters 20 is in operation and the other is in standby to prevent the entire methanol fuel supply system from being unable to work normally due to a sudden failure of the filter 20.

[0027] In this embodiment, the heat exchange system includes a No. 1 heat exchanger 21, a No. 1 heat exchange pipeline 15, a No. 2 heat exchange pipeline 11, a No. 2 heat exchanger 10, a centrifugal pump 12 and a water-ethylene glycol expansion tank 16; the No. 1 heat exchange pipeline 15 connects the No. 1 heat exchanger 21, the No. 2 heat exchanger 10, the centrifugal pump 12 and the water-ethylene glycol expansion tank 16 into a loop; the water-ethylene glycol expansion tank 16 is respectively provided with a water-ethylene glycol input port 17; the No. 2 heat exchange pipeline 11 is connected to the No. 2 heat exchanger 10, and has a water input port 13 and a water output port 14; the water -Ethylene glycol flows from the water-ethylene glycol input port 17 to the water-ethylene glycol expansion tank 16, and flows into the No. 2 heat exchanger 10 through the centrifugal pump 12; hot water is input from the water input port 13 to the No. 2 heat exchanger 10 to heat the water-ethylene glycol flowing through it, and then output from the water output port 14; the water-ethylene glycol heated by the No. 2 heat exchanger 10 flows into the No. 1 heat exchanger 21, and the heated water-ethylene glycol heats the methanol flowing through the methanol supply main line. After heat exchange, the cooled water-ethylene glycol flows back to the water-ethylene glycol expansion tank 16, and is circulated by the centrifugal pump 12. The heat exchange system is optimized, and the No. 1 heat exchanger 21 and the No. 2 heat exchanger 10 are additionally set to heat the water-ethylene glycol, and an expansion tank is set to ensure heat exchange safety.

[0028] In this embodiment, the centrifugal pump 12 is a double centrifugal pump 12, and two centrifugal pumps 12 are connected in parallel to the first heat exchange pipeline 15. The double centrifugal pump 12 is set, and one of the two centrifugal pumps 12 is in operation and the other is in standby mode to prevent the whole heat exchange system from being unable to work normally due to a sudden failure of the centrifugal pump 12, and also to facilitate maintenance.

[0029] In this embodiment, a residual methanol discharge system is also included, including a nitrogen pipeline 1, which is connected in parallel to the methanol fuel supply main pipeline and is provided with a methanol discharge pipeline 7, in which a diaphragm pump 8 is provided; the nitrogen pipeline 1 purges the residual methanol in the methanol fuel supply main pipeline, and discharges the residual methanol under the negative pressure of the diaphragm pump 8.

[0030] In this embodiment, the residual methanol discharge system further includes an FVT methanol reflux pipe 6, which is connected in parallel upstream of the diaphragm pump 8, and the residual methanol in the FVT methanol reflux pipe 6 is also discharged through the diaphragm pump 8.

[0031] The nitrogen pipeline 1 is used to purge the residual liquid in the pipeline and equipment. Methanol is corrosive and toxic. It is necessary to prevent corrosion to the equipment and leakage and volatilization to cause poisoning. The diaphragm pump 8 assists in nitrogen purging. Nitrogen may not be able to blow it clean. Turning on the diaphragm pump 8 to pump negative pressure has an auxiliary effect. The methanol gas after purging is discharged from the methanol discharge channel to the methanol discharge tank. The methanol discharge tank is not part of this skid, but is located in other skids in the ship. Figure 1 Not drawn in.

[0032] In this embodiment, the bottom of the methanol fuel supply system of the ship dual-fuel generator is also provided with a connecting liquid receiving tray 9. In view of the liquid recovery step when leakage occurs, the system can operate sustainably, stably and safely.

[0033] The methanol fuel supply system of the ship dual-fuel generator is also provided with a safety valve control system, including a plurality of electromagnetic valves 26 distributed in the methanol fuel supply main pipeline including the input pipeline 4. Figure 1 As shown, the top one is a safety valve control system, which includes multiple solenoid valves 26. These control valves have their own serial numbers. The methanol fuel supply main line below is also provided with pneumatic valves with corresponding serial numbers. In the safety valve control system, the solenoid valve controls the on-off of the gas, and the gas controls the on-off of the pneumatic valve. The pneumatic valve with the corresponding serial number in the methanol fuel supply main line below can switch according to the signal when an operation signal is sent to the solenoid valve with a serial number.

[0034] The safety valve control system is a set of air-powered valves that can be opened and closed by controlling the pressure of the air source. The main thing is to fill and release gas when control is needed, and use air pressure as a control signal. Because the pressure changes quickly and sensitively, it has the advantage of fast response; because there are no electronic components, precision mechanical parts and other vulnerable parts, it has the advantages of simple structure, high reliability, long service life and easy maintenance. Three of the valves can be urgently cut off by the ESD (emergency cut-off) electromagnetic valve 27. The positions of the pneumatic valves corresponding to these three valves are respectively set in the methanol fuel reflux pipeline 2, the input pipeline 4 and the FVT input pipeline, which can be cut off at the same time to ensure that the system can be quickly shut down in an emergency.

[0035] The working principle of the whole device is as follows: methanol fuel is input into the input pipeline 4, and the methanol fuel in the pipeline is pressurized by the booster pump 3 to form high-pressure methanol fuel. When the pressure in the pipeline exceeds the upper limit of the safety pressure relief valve 22, the safety pressure relief valve 22 will open to release the pressure. The pressure sensor 23 is used to detect and display the pressure of the main flow. If the pressure is too high, it will send a signal to the pressure control valve 25, and the pressure control valve 25 will open to release the pressure and divert part of the methanol fuel to the methanol fuel return pipeline 2. The methanol in the methanol fuel supply main pipeline is heated by the No. 1 heat exchanger 21 to meet the temperature requirements for FVT input. Water-ethylene glycol flows from the water-ethylene glycol input port 17 to the water-ethylene glycol expansion tank 16, and flows into the second heat exchanger 10 through the centrifugal pump 12; hot water is input from the water input port 13 to the second heat exchanger 10 to heat the water-ethylene glycol flowing through, and then output from the water output port 14. The water temperature at the water input port 13 is 36°C, and after heat exchange with the water-ethylene glycol, the water temperature output from the water output port 14 is 26°C; the water-ethylene glycol heated by the second heat exchanger 10 flows into the first heat exchanger 21, and the heated water-ethylene glycol heats the methanol flowing through the methanol supply main line. The cooled water-ethylene glycol after heat exchange flows back to the water-ethylene glycol expansion tank 16, and is recycled by the centrifugal pump 12. Finally, the methanol is filtered by the filter 20 to form a compliant methanol fuel, which is continuously and stably output to the FVT input pipeline 19. The nitrogen pipeline 1 purges the residual methanol in the methanol fuel supply main pipeline, and discharges the residual methanol under the negative pressure of the diaphragm pump 8.

[0036] In the description of the utility model specification, it is necessary to understand that the orientation or position relationship indicated by the terms "between", "upstream", "bottom", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying 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 a limitation on the utility model.

[0037] In the present invention, unless otherwise specified and limited, the term "connection" and other terms 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A methanol fuel supply system for a ship dual-fuel generator, characterized in that The invention comprises a methanol fuel supply main pipeline, the methanol fuel supply main pipeline comprises an input pipeline (4) and an FVT input pipeline (19), a booster pump (3), a safety pressure relief valve (22), a heat exchange system and a filter (20) are arranged in sequence between the input pipeline (4) and the FVT input pipeline (19); a pressure control system is arranged between the booster pump (3) and the safety pressure relief valve (22), the pressure control system comprises a methanol fuel return pipeline (2), a pressure control valve (25), and a pressure sensor (23); the heat exchange system comprises a first heat exchanger (21), a second heat exchanger (22), and a second heat exchanger (23); The first heat exchange pipeline (15), the second heat exchange pipeline (11), the second heat exchanger (10), the centrifugal pump (12) and the water-ethylene glycol expansion tank (16); the first heat exchange pipeline (15) connects the first heat exchanger (21), the second heat exchanger (10), the centrifugal pump (12) and the water-ethylene glycol expansion tank (16) into a loop; the water-ethylene glycol expansion tank (16) is provided with a water-ethylene glycol input port (17); the second heat exchange pipeline (11) is connected to the second heat exchanger (10) and has a water input port (13) and a water output port (14).

2. A methanol fuel supply system for a ship dual-fuel generator according to claim 1, characterized in that The booster pump (3) is a double booster pump (3), and the two booster pumps (3) are connected in parallel to the methanol fuel supply main pipeline.

3. A methanol fuel supply system for a ship dual-fuel generator according to claim 1, characterized in that The connection point between the methanol fuel return pipeline (2) and the methanol fuel supply main pipeline is located between the booster pump (3) and the safety pressure relief valve (22); the pressure sensor (23) is arranged in the methanol fuel supply main pipeline, and is located between the connection point between the methanol fuel return pipeline (2) and the methanol fuel supply main pipeline and the safety pressure relief valve (22); the pressure control valve (25) is arranged in the methanol fuel return pipeline (2); and the pressure sensor (23) and the pressure control valve (25) are connected by a cable (24).

4. A methanol fuel supply system for a ship dual-fuel generator according to claim 3, characterized in that The safety pressure relief valve (22) is connected to a pressure relief pipeline (5).

5. The methanol fuel supply system for a ship dual-fuel generator according to claim 1 is characterized in that The filter (20) is a double filter (20) connected to the main methanol fuel supply line.

6. A methanol fuel supply system for a ship dual-fuel generator according to claim 1, characterized in that The centrifugal pump (12) is a double centrifugal pump (12), which is composed of two centrifugal pumps (12) connected in parallel to the first heat exchange pipeline (15).

7. The methanol fuel supply system for a ship dual-fuel generator according to claim 1 is characterized in that The invention also comprises a residual methanol discharge system, comprising a nitrogen pipeline (1), the nitrogen pipeline (1) being connected in parallel to a main methanol fuel supply pipeline and provided with a methanol discharge pipeline (7), wherein a diaphragm pump (8) is provided in the methanol discharge pipeline (7); the nitrogen pipeline (1) purges the residual methanol in the main methanol fuel supply pipeline, and discharges the residual methanol under the negative pressure of the diaphragm pump (8).

8. A methanol fuel supply system for a ship dual-fuel generator according to claim 7, characterized in that The residual methanol discharge system further comprises an FVT methanol reflux pipe (6) connected in parallel from the upstream of the diaphragm pump (8), and the residual methanol in the FVT methanol reflux pipe (6) is also discharged through the diaphragm pump (8).

9. The methanol fuel supply system for a ship dual-fuel generator according to claim 1 is characterized in that The bottom of the ship dual-fuel generator methanol fuel supply system is also provided with a connecting liquid receiving tray (9); the ship dual-fuel generator methanol fuel supply system is also provided with a safety valve control system, including a plurality of electromagnetic valves (26) distributed in the methanol fuel supply main pipeline including the input pipeline (4).

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