Marine methanol supply unit with intelligent safety control and control method

Abstract

The invention discloses an intelligent safety control marine methanol supply unit and a control method. The intelligent safety control marine methanol supply unit comprises a compressed air supply pipeline, a nitrogen supply pipeline, a methanol supply pipeline, a methanol discharge pipeline, an ethylene glycol water supply pipeline and a low-temperature fresh water supply pipeline, the compressed air supply pipeline controls compressed air to be used for air supply and action of all pneumatic devices and pneumatic valves. The nitrogen supply pipeline is used for inerting the methanol supply pipeline and operating the nitrogen system; the methanol supply pipeline and the methanol discharge pipeline are respectively used for supplying and discharging methanol; the ethylene glycol water supply pipeline and the low-temperature fresh water supply pipeline are used for preparing for methanol heat exchange in advance. According to the intelligent safety control marine methanol supply unit, needed equipment is combined into an independent device, the structure is compact, connection is reliable, installation, debugging, use and maintenance are convenient, and meanwhile centralized management control is facilitated; the intelligence and safety of the ship are improved, and the emission of international and domestic air environments is better.

Description

Technical Field

[0001] The invention relates to an intelligent safety-controlled marine methanol supply unit and a control method, belonging to the technical field of ships. Background Art

[0002] Under the general background of my country's carbon peak and carbon neutrality goals and the strategic goal of greenhouse gas emission reduction of the International Maritime Organization, the current international and domestic ship air pollutant emission control standards are becoming increasingly stringent, and various clean alternative fuels are gradually being used on ships to varying degrees, such as ULSFO, MGO, LNG, methanol, hydrogen, ammonia fuel, etc. Methanol has begun to be favored and accepted by many ship owners and used as engine fuel.

[0003] At present, methanol fuel supply system has been gradually applied in some automobiles and ships, but some functions of the methanol fuel supply system are still relatively simple, and some intelligent functions and safety factors are not perfect. For example: failure of methanol system flow and pressure control, back pressure of methanol mixing cylinder exhaust, lack of low liquid level safety alarm and corresponding operation function guarantee of methanol mixing cylinder, internal seal leakage problem and safety guarantee of ordinary double filter, lack of local and remote manual level display and alarm of ethylene glycol water tank, ultra-low temperature environment usability of ethylene glycol water, dual reliability and safety of standby pump operation control mode and temperature control mode, reliability of complete methanol discharge, etc.

[0004] Based on the above situation, we invented a marine methanol supply unit with intelligent and safe control. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a marine methanol supply unit and a control method with intelligent and safe control, so as to solve the above-mentioned technical problems.

[0006] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: an intelligent safety-controlled marine methanol supply unit, comprising a compressed air supply pipeline, a nitrogen supply pipeline, a methanol supply pipeline, a methanol discharge pipeline, a glycol water supply pipeline and a low-temperature fresh water supply pipeline; The compressed air supply pipe includes a manual ball valve, an air filter, a solenoid valve, a pressure reducing valve, a pressure gauge PG, a pressure transmitter PT, a pressure control valve, a three-way regulating valve, a pneumatic ball valve, and a discharge pump; One side of the compressed air supply pipe is connected to an interface; the interface is used to supply compressed air in the air bottle, and enters each branch pipeline through a manual ball valve and an air filter in sequence; the air filter is used to filter impurities and particulate matter in the nitrogen, and the respective pneumatic ball valves are used to control the on and off of the compressed air, and the electromagnetic pressure reducing valve is used to reduce the pressure of the compressed air entering the discharge pump; The nitrogen supply pipeline includes a nitrogen filter, a pneumatic ball valve, a manual ball valve, a check valve, a pressure gauge PG, a pressure transmitter PT, and a liquid level switch LS; the nitrogen filter is used to filter impurities and particulate matter in the nitrogen; the pneumatic ball valve and the manual ball valve are used to control the introduction and cut-off of nitrogen, and the check valve is used to control the check of methanol; the nitrogen is supplied from the interface and enters each pneumatic control branch pipeline through the manual ball valve, the nitrogen filter, and the pneumatic ball valve; the pressure gauge PG and the pressure transmitter PT behind the nitrogen inlet can monitor the nitrogen pressure locally and on the control panel, and a low pressure alarm is issued when the pressure is low, and the on and off of the liquid level switch LS can determine whether methanol leaks into the nitrogen pipeline; The methanol supply pipeline includes a single coarse filter, a methanol supply pump, a low-pressure heat exchanger, a pressure control valve, a mixing cylinder, a high-pressure heat exchanger, a methanol circulation pump, a double fine filter, a pressure control valve, a flow meter, a pneumatic ball valve, a manual ball valve, a back pressure valve, a safety valve, a pressure gauge, a pressure transmitter, a temperature gauge, a temperature transmitter, a temperature switch, and a liquid level switch; The single coarse filter is used for primary filtration of methanol entering the methanol supply pump, and the single coarse filter is used for primary filtration of methanol entering the methanol supply pump to remove larger impurities and particulate matter in the methanol, ensuring the cleanliness requirements of the methanol entering the methanol supply pump; The methanol supply pump is used for the delivery and supply of methanol and primary pressurization; The mixing cylinder is used for reflux mixing of methanol and is equipped with a low liquid level switch LS, a low-low liquid level switch LS, a pressure transmitter TT, a safety valve, an exhaust pneumatic ball valve, an exhaust back pressure valve, and a check valve; the mixing cylinder has a combination function of automatically exhausting at a low liquid level, opening the back pressure, and stopping exhausting at a high liquid level; The methanol circulation pump is used for the transportation and secondary pressurization of methanol. The methanol circulation pump is driven by a variable frequency motor. The frequency converter automatically adjusts the speed of the variable frequency motor according to the change of engine load to control the flow of the methanol circulation pump. At the same time, the pressure control valve controls the pressure of the pump outlet according to the pressure feedback of the pressure transmitter PT before the methanol outlet. The high-pressure heat exchanger is used for secondary heat exchange between ethylene glycol water and methanol, that is, to exchange heat with methanol delivered by a methanol circulation pump; the temperature gauge TG at the inlet of the high-pressure heat exchanger and the temperature gauge TG at the outlet respectively display the local temperatures of the inlet and outlet, and the temperature transmitter TT and the temperature controller TC at the outlet of the high-pressure heat exchanger will realize dual protection control, the sampling temperature of the temperature transmitter is input to the control board to control the temperature of the methanol being exchanged, and the temperature controller performs temperature control protection on the heat exchange according to the set temperature, and the temperature control range can be set; The double fine filter is used for secondary filtration of methanol entering the engine to remove fine impurities and particulate matter in the methanol, ensuring the cleanliness requirements of the methanol entering the engine; the flow meter is used for flow measurement, that is, to measure the consumption of the generator, specifically including mass flow, volume flow, temperature, density, and the flow is divided into instantaneous flow and cumulative flow; The methanol discharge pipeline includes a discharge pump, a pneumatic ball valve, a manual ball valve, a check valve, a sight glass, a pressure gauge PG, and a liquid level switch LS; and the discharge pipeline is located at the bottom layer to ensure that the discharge of the equipment and pipelines can flow in; the discharge pump is a pneumatic diaphragm pump, one discharge pump is working, and the other discharge pump is standby, the pneumatic ball valve and the manual ball valve are used to control the discharge in and out, and the check valve is used to control the check of the discharge pipeline; the peripheral discharge outlet uses an oxygen concentration measuring instrument to measure the oxygen content to ensure that the components and pipelines are completely emptied, and no methanol is left, so as to avoid air pollution and ensure that it will not affect the maintenance, operation, health and safety of personnel; The glycol water supply pipeline includes an ethylene glycol water tank, an ethylene glycol water pump, an ethylene glycol water heat exchanger, a three-way regulating valve, a throttle valve, a manual ball valve, a check valve, a pressure gauge PG, a pressure transmitter PT, a temperature gauge TG, a temperature transmitter TT, a temperature switch TS, a magnetic flap level gauge LI, a liquid level transmitter LT, and a liquid level switch LS; The ethylene glycol water enters the ethylene glycol water tank (201) from the interface through the manual ball valve, and the air in the ethylene glycol water tank is discharged to the atmosphere through the pipeline from the interface through the manual ball valve; The ethylene glycol water in the ethylene glycol water tank passes through a manual ball valve, No. 1 ethylene glycol water pump, and a manual ball valve, or passes through a manual ball valve, No. 2 ethylene glycol water pump, and a manual ball valve of a spare pipeline, and then passes through an ethylene glycol water heat exchanger, a manual ball valve, and a three-way regulating valve, and is divided into two paths; one path of ethylene glycol water enters the low-pressure heat exchanger through a manual ball valve, and then returns to the ethylene glycol water tank through a manual ball valve, a check valve, and a throttle valve; one path of ethylene glycol water enters the high-pressure heat exchanger through a manual ball valve, and then returns to the ethylene glycol water tank through a manual ball valve, a check valve, and a throttle valve, and the ethylene glycol water is circulated; The manual ball valve is used to control the flow and cut-off of glycol water, and the check valve is used to control the check of the two-way glycol water circuit; The glycol water tank is equipped with a temperature transmitter TT, a liquid level switch LS, a magnetic flap liquid level gauge LI, a liquid level sensor LS, and a manual ball valve; the glycol water heat exchanger is used for heat exchange between low-temperature fresh water and glycol water; the glycol water heat exchanger is used for heat exchange between low-temperature fresh water and glycol water; the inlet of the three-way regulating valve is equipped with a temperature transmitter TT, and the outlet is equipped with a temperature transmitter TT and a temperature controller TC; the temperature transmitter TT at the inlet of the three-way regulating valve can measure the temperature after the glycol water heat exchanger; The glycol water heat exchanger is used for heat exchange between low-temperature fresh water and glycol water; The three-way regulating valve is used to adjust the final outlet temperature of the glycol water to ensure the temperature of the glycol water entering the low-pressure heat exchanger and the high-pressure heat exchanger; The inlet of the three-way regulating valve is equipped with a temperature transmitter TT, and the outlet is equipped with a temperature transmitter TT and a temperature controller TC; the temperature transmitter TT at the inlet of the three-way regulating valve can measure the temperature after the glycol water heat exchanger; the temperature transmitter TT and the temperature controller TC at the outlet will realize double protection control, the temperature transmitter sampling temperature is input to the control board to control the temperature of the glycol water for heat exchange, and the temperature controller performs temperature control protection on the heat exchange according to the set temperature, and the temperature control range can be set; The low-temperature fresh water supply pipeline includes a manual ball valve, a pressure gauge PG, a temperature gauge TG, and a temperature transmitter TT; the low-temperature fresh water from the central cooling water system passes through the manual ball valve through the pipeline from the interface to the glycol water heat exchanger to exchange heat with the glycol water, and the fresh water after heat exchange passes through the manual ball valve from the interface through the pipeline and then returns to the central cooling water system; the manual ball valve is used to control the entry and cutoff of fresh water; The pressure gauge PG, temperature gauge TG and temperature transmitter TT behind the low-temperature fresh water inlet can monitor the pressure and temperature of the fresh water locally and on the control panel, and issue a high temperature alarm when the temperature is high.

[0007] Furthermore, there are two methanol supply pumps, two methanol circulation pumps and two discharge pumps, one for use and one for backup, and they serve as backup for each other.

[0008] Furthermore, the methanol supply pump and the methanol circulation pump are variable frequency pumps, and the flow rate can automatically change as the load of the ship engine changes.

[0009] Furthermore, the mixing cylinder is equipped with a low liquid level switch LS, a low-low liquid level switch LS, an exhaust back pressure valve, and a safety valve; the methanol mixing cylinder has a combined function of automatically exhausting at a low liquid level, turning on the back pressure, and stopping exhausting at a high liquid level, and the pressure in the mixing cylinder can be maintained during exhaust.

[0010] Furthermore, the liquid level switches of the mixing cylinder and the pipeline will adopt tuning fork liquid level switches, which have higher sensitivity and are not affected by the swaying of the ship.

[0011] Furthermore, the ethylene glycol water tank is equipped with a magnetic flap level gauge LI, a liquid level sensor LT, and a low liquid level switch LS; the liquid level can be directly checked through the magnetic flap level gauge, the liquid level sensor transmits a 4-20mA signal to the control panel to display a 0-100% liquid level ratio, the actual synchronous liquid level can be checked remotely, and the low liquid level switch can send a low liquid level alarm.

[0012] Furthermore, the discharge pipeline is located at the bottom layer and is purged with nitrogen. An oxygen concentration meter can be added to the external pipeline of the discharge port to measure the oxygen content to ensure that the components and pipelines are completely emptied without any methanol left to avoid air pollution.

[0013] Further, the specific working method is as follows: Step 1: The compressed air from the control air bottle is supplied from the interface and enters each branch pipeline through the manual ball valve and air filter; Step 2: Before methanol is supplied and used, the methanol supply pipeline needs to be inerted, the nitrogen system needs to be operated, and the release system needs to be operated; Step 3: After the methanol supply pipeline is inerted, the methanol supply pipeline can be used to supply methanol; Step 4: When the ship needs to stop the methanol supply, stop the methanol supply pump and the methanol circulation pump; open the pneumatic ball valve of the discharge pipeline in turn, and methanol flows into the discharge pipeline. At this time, the liquid level switch LS of the discharge pipeline triggers the high liquid level alarm, and the system automatically starts the discharge pump, and methanol flows into the methanol daily cabinet or the methanol discharge cabinet from the discharge port; when the discharge pipeline liquid level switch LS triggers the low liquid level signal, use nitrogen to purge and inertize, and the process is the same as the "Nitrogen Purge Inertization Process"; when the pressure difference of the double fine filter exceeds the alarm value, it is necessary to perform relevant operations on the double fine filter, switch the valve, switch to the spare filter cartridge, and discharge, nitrogen purge, disassemble, inspect, clean the filter element, and reinstall the original working filter cartridge according to the process; then introduce nitrogen into the original working filter cartridge to purge the internal air with nitrogen. After the inerting is completed, retain the nitrogen for pressure test, and confirm whether the pressure is maintained; Step 5: Glycol water supply. Before methanol is supplied and used, the glycol water pipeline needs to be operated to prepare for methanol heat exchange in advance. Step 6: Low-temperature fresh water supply. Before methanol is supplied and used, the low-temperature fresh water pipeline needs to be operated to prepare for methanol heat exchange in advance.

[0014] Furthermore, in the step 2, nitrogen from the nitrogen tank is supplied from the interface and enters each pneumatic control branch pipeline via a manual ball valve, a nitrogen filter, and a main pneumatic ball valve; One channel of nitrogen is separated from the main manual ball valve and enters the discharge pipeline through the manual ball valve and check valve; One nitrogen path is separated from the main manual ball valve, enters the No. 1 single filter and No. 1 methanol supply pump through the manual ball valve and check valve, and then enters the discharge pipeline through the manual ball valve, sight glass and check valve; One nitrogen path is separated from the main manual ball valve, enters the No. 2 single filter and No. 2 methanol supply pump through the manual ball valve and check valve, and then enters the discharge pipeline through the manual ball valve, sight glass and check valve; One nitrogen path is separated from the main manual ball valve and enters the No. 1 methanol circulation pump through the manual ball valve and check valve, and then enters the discharge pipeline through the manual ball valve, sight glass and check valve; One nitrogen path is separated from the main manual ball valve and enters the No. 2 methanol circulation pump through the manual ball valve and check valve, and then enters the discharge pipeline through the manual ball valve, sight glass and check valve; One path of nitrogen is separated from the main manual ball valve, enters the No. 1 filter cartridge of the duplex fine filter through the manual ball valve and check valve, and then enters the discharge pipeline through the manual ball valve, sight glass and check valve; One path of nitrogen is separated from the main manual ball valve, enters the No. 2 filter cartridge of the duplex fine filter through the manual ball valve and check valve, and then enters the discharge pipeline through the manual ball valve, sight glass and check valve; One path of nitrogen enters the nitrogen inlet pipe of the methanol supply pipeline from the pneumatic ball valve and the check valve; One-way nitrogen enters the mixing cylinder from the pneumatic ball valve and check valve; One channel of nitrogen enters the discharge pipeline from the pneumatic ball valve and check valve; The nitrogen entering the methanol supply pipeline passes through various components and pipelines in sequence, and then enters the discharge pipeline through the pneumatic ball valve, pneumatic ball valve, pneumatic ball valve, pneumatic ball valve, pneumatic ball valve, pneumatic ball valve, and pneumatic ball valve, and finally passes through the check valve and is discharged from the interface to the methanol daily cabinet or the methanol discharge cabinet; when the No. 1 discharge pump or the No. 2 discharge pump is turned on, rapid discharge can be carried out; After a period of time, all the air in the original methanol supply pipeline is purged and discharged by nitrogen. In this way, the nitrogen purging is completed and the inerting is ended. The oxygen content can also be measured using an oxygen concentration meter at the peripheral discharge outlet.

[0015] Further, in the step three, the methanol from the ship's methanol daily cabinet is sucked into the mixing drum through the check valve, manual ball valve, manual ball valve, and No. 1 single filter from the interface by the No. 1 methanol supply pump, or from the spare pipeline through the manual ball valve, manual ball valve, and No. 2 single filter by the No. 2 methanol supply pump and then through the check valve, manual ball valve, and manual ball valve into the mixing drum, and then sequentially through the manual ball valve, high-pressure heat exchanger, manual ball valve, manual ball valve, No. 1 methanol circulation pump or No. 2 methanol circulation pump, check valve, manual ball valve, double fine filter, mass flow meter, and pneumatic ball valve from the interface to be delivered to the engine; The methanol supply pump and the methanol circulation inlet and outlet are both equipped with double ball valves to ensure complete sealing during maintenance and can be sealed when the pump is under long-term maintenance; The overflow pipeline of the methanol supply pump is equipped with a low-pressure heat and pressure control valve; the low-pressure heat exchanger is used for the primary heat exchange between ethylene glycol water and methanol, that is, the overflow methanol and the primary supply methanol are heat exchanged; the pressure control valve is used to control the methanol supply pressure, and the excess methanol flows back to the methanol supply through the low-pressure heat exchanger pressure control valve for recirculation; The methanol supply pump is used for the transportation and supply of methanol and the first-stage pressurization. The methanol supply pump is driven by a variable frequency motor. The frequency converter automatically adjusts the speed of the variable frequency motor according to the changes in the engine load to control the flow of the methanol supply pump. At the same time, the pressure control valve controls the pressure of the pump outlet according to the pressure feedback of the pressure transmitter PT behind the methanol supply pump. The combination of the variable frequency pump and the pressure control valve makes the flow and pressure control more stable. The coupling of the methanol supply pump is a magnetic coupling, and methanol is not prone to leakage.

[0016] The beneficial effects of the present invention are as follows: the intelligent safety-controlled marine methanol supply unit is a pressurized supply system in front of the engine, which can provide the engine with methanol of suitable flow, pressure, temperature and precision, and ensure the normal operation of the engine during operation. The electrical equipment in the explosion-proof area meets the explosion-proof level, and pneumatic control valves are used, and electrical centralized control is carried out in the safe area. Nitrogen can be used to discharge and purge the equipment and pipelines before and after the engine is used and during equipment maintenance.

[0017] This intelligent safety-controlled marine methanol supply unit combines the required equipment into an independent device with a compact structure, reliable connection, easy installation, commissioning, use and maintenance, and is conducive to centralized management and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall principle diagram of the marine methanol supply unit for intelligent safety control; Figure 2 The schematic diagram of the compressed air supply process of the marine methanol supply unit for intelligent safety control; Figure 3 The schematic diagram of the nitrogen purge inerting process of the marine methanol supply unit for intelligent safety control; Figure 4 The schematic diagram of the methanol supply process of the marine methanol supply unit for intelligent safety control; Figure 5 Schematic diagram of the glycol water supply process and low-temperature fresh water supply process of the marine methanol supply unit of the intelligent safety control; In the figure: 1 interface ten, 101, pneumatic ball valve, 102, single coarse filter, 103, methanol supply pump, 104, single coarse filter, 105, methanol supply pump, 106, low-pressure heat exchanger, 107, pressure control valve, 108, mixing cylinder, 109, high-pressure heat exchanger, 110, methanol circulation pump, 111, methanol circulation pump, 112, double fine filter, 113, double fine filter, 114, flow meter, 115, pneumatic ball valve, 2, interface nine, 201, ethylene glycol water tank, 202, ethylene glycol water pump, 203, ethylene glycol water pump, 204, ethylene glycol water heat exchanger, 205, three-way Regulating valve, 206, throttle valve, 3, interface, 301, nitrogen filter, 302, pneumatic ball valve, 303, pneumatic ball valve, 304, pneumatic ball valve, 305, pneumatic ball valve, 4, interface eight, 401, pneumatic ball valve, 402, pneumatic ball valve, 403, pneumatic ball valve, 404, pneumatic ball valve, 405, pneumatic ball valve, 406, pneumatic ball valve, 407, pneumatic ball valve, 408, discharge pump, 409, discharge pump, 5, interface one, 501, air filter, 502, solenoid pressure reducing valve, 6, interface two, 7, interface three, 8, interface four, 9, interface five, 10, interface six, 11, interface seven. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] like Figure 1 As shown, an intelligent safety-controlled marine methanol supply unit includes a compressed air supply pipeline, a nitrogen supply pipeline, a methanol supply pipeline, a methanol discharge pipeline, a glycol water supply pipeline and a low-temperature fresh water supply pipeline; The compressed air supply pipe includes a manual ball valve, an air filter 501, an electromagnetic pressure reducing valve 502, a pressure gauge PG, a pressure transmitter PT, pressure control valves 107, 113, a three-way regulating valve 205, pneumatic ball valves 101, 115, 302, 303, 304, 305, 401, 402, 403, 404, 405, 406, 407, and discharge pumps 408, 409; one side of the compressed air supply pipe is connected to the interface three 7; the interface three 7 is used for the compressed air in the air bottle to enter each branch pipeline through the manual ball valve and the air filter 501 in turn; the air filter 501 is used to filter impurities and particulate matter in the nitrogen, the respective pneumatic ball valves are used to control the on and off of the compressed air, and the electromagnetic pressure reducing valve 502 is used to reduce the pressure of the compressed air entering the discharge pumps 408, 409; In this embodiment, the nitrogen supply pipeline includes a nitrogen filter 301, pneumatic ball valves 302, 303, 304, 305, a manual ball valve, a check valve, a pressure gauge PG, a pressure transmitter PT, and a liquid level switch LS; the nitrogen filter 301 is used to filter impurities and particulate matter in the nitrogen; the pneumatic ball valves 302, 303, 304, 305, and the manual ball valve are used to control the entry and cutoff of nitrogen, and the check valve is used to control the check of methanol; the nitrogen is supplied from the interface 48, and enters each pneumatic control branch pipeline through the manual ball valve, the nitrogen filter 301, and the pneumatic ball valve 302; the pressure gauge PG and the pressure transmitter PT behind the interface 48 can monitor the nitrogen pressure locally and from the control panel, and a low pressure alarm is issued when the pressure is low. The on and off of the liquid level switch LS can determine whether methanol leaks into the nitrogen pipeline; In this embodiment, the methanol supply pipeline includes single coarse filters 102, 104, methanol supply pumps 103, 105, a low-pressure heat exchanger 106, a pressure control valve 107, a mixing barrel 108, a high-pressure heat exchanger 109, a methanol circulation pump 110, 111, a double fine filter 112, a pressure control valve 113, a flow meter 114, pneumatic ball valves 101, 115, a manual ball valve, a back pressure valve, a safety valve, a pressure gauge, a pressure transmitter, a temperature gauge, a temperature transmitter, a temperature switch, and a liquid level switch; The single coarse filter 102 is used for primary filtration of methanol entering the methanol supply pump 103, and the single coarse filter 104 is used for primary filtration of methanol entering the methanol supply pump 105 to remove larger impurities and particles in the methanol to ensure the cleanliness requirements of the methanol entering the methanol supply pump; Methanol supply pumps 103 and 105 are used for the delivery and supply of methanol and primary pressurization; The mixing cylinder 108 is used for the reflux mixing of methanol and is equipped with a low liquid level switch LS, a low-low liquid level switch LS, a pressure transmitter TT, a safety valve, an exhaust pneumatic ball valve 407, an exhaust back pressure valve, and a check valve; the mixing cylinder 108 has the combined functions of automatically exhausting at a low liquid level, opening the back pressure, and stopping exhausting at a high liquid level; Methanol circulation pumps 110 and 111 are used for methanol transportation and secondary pressurization. The methanol circulation pump is driven by a variable frequency motor. The frequency converter automatically adjusts the speed of the variable frequency motor according to the change of engine load to control the flow of the methanol circulation pump. At the same time, the pressure control valve 113 controls the pressure of the pump outlet according to the pressure feedback of the pressure transmitter PT before the methanol outlet 2. The high-pressure heat exchanger 109 is used for the secondary heat exchange between ethylene glycol water and methanol, that is, to exchange heat with the methanol delivered by the methanol circulation pumps 110 and 111; the temperature gauge TG at the inlet of the high-pressure heat exchanger 109 and the temperature gauge TG at the outlet respectively display the local temperature of the inlet and outlet, and the temperature transmitter TT and the temperature controller TC at the outlet of the high-pressure heat exchanger 109 will realize double protection control, the sampling temperature of the temperature transmitter is input to the control board to control the temperature of the methanol being exchanged, and the temperature controller performs temperature control protection on the heat exchange according to the set temperature, and the temperature control range can be set; The double fine filter 112 is used for secondary filtration of methanol entering the engine to remove fine impurities and particulate matter in the methanol to ensure the cleanliness requirements of the methanol entering the engine; the flow meter 114 is used for flow measurement, that is, to measure the consumption of the generator, specifically including mass flow, volume flow, temperature, density, and the flow is divided into instantaneous flow and cumulative flow; In this embodiment, the methanol discharge pipeline includes discharge pumps 408, 409, pneumatic ball valves 401, 402, 403, 404, 405, 406, 407, manual ball valves, check valves, sight glasses, pressure gauges PG, and liquid level switches LS; and the discharge pipeline is located at the bottom layer to ensure that the discharge of equipment and pipelines can flow in; the discharge pump is a pneumatic diaphragm pump, one discharge pump is working, and one discharge pump is standby, the pneumatic ball valve and the manual ball valve are used to control the discharge in and out, and the check valve is used to control the check of the discharge pipeline; the peripheral discharge outlet uses an oxygen concentration measuring instrument to measure the oxygen content to ensure that the components and pipelines are completely emptied without methanol residue to avoid air pollution and ensure that it will not affect the maintenance, operation, health and safety of personnel; In this embodiment, the ethylene glycol water supply pipeline includes an ethylene glycol water tank 201, ethylene glycol water pumps 202, 203, an ethylene glycol water heat exchanger 204, a three-way regulating valve 205, a throttle valve 206, a manual ball valve, a check valve, a pressure gauge PG, a pressure transmitter PT, a temperature gauge TG, a temperature transmitter TT, a temperature switch TS, a magnetic flap level gauge LI, a liquid level transmitter LT, and a liquid level switch LS; ethylene glycol water enters the ethylene glycol water tank 201 from interface 3 through the manual ball valve, and the air in the ethylene glycol water tank is discharged to the atmosphere through the pipeline from interface 4 through the manual ball valve; the ethylene glycol water in the ethylene glycol water tank 201 is discharged through the manual ball valve, No. 1 ethylene glycol water pump 202, manual ball valve, or through the manual ball valve of the spare pipeline, No. 2 ethylene glycol water pump 203, manual ball valve, and then through the ethylene glycol water heat exchanger 204, manual ball valve, and three-way regulating valve 205, it is divided into two paths; one path of ethylene glycol water enters the low-pressure heat exchanger 106 through the manual ball valve, and then returns to the ethylene glycol water tank 201 through the manual ball valve, check valve, and throttle valve 206; one path of ethylene glycol water enters the high-pressure heat exchanger 109 through the manual ball valve, and then returns to the ethylene glycol water tank 201 through the manual ball valve, check valve, and throttle valve 206, and the ethylene glycol water circulates; the manual ball valve is used to control the entry and cutoff of ethylene glycol water, and the check valve is used to control the two-way ethylene glycol water. The check valve of the alcohol-water circuit; the ethylene glycol water tank 201 is equipped with a temperature transmitter TT, a liquid level switch LS, a magnetic flap liquid level gauge LI, a liquid level sensor LS, and a manual ball valve; the ethylene glycol water heat exchanger 204 is used for heat exchange between low-temperature fresh water and ethylene glycol water; the ethylene glycol water heat exchanger 204 is used for heat exchange between low-temperature fresh water and ethylene glycol water; the inlet of the three-way regulating valve 205 is equipped with a temperature transmitter TT, and the outlet is equipped with a temperature transmitter TT and a temperature controller TC; the temperature transmitter TT at the inlet of the three-way regulating valve can measure the temperature after the ethylene glycol water heat exchanger; the ethylene glycol water heat exchanger 204 is used for heat exchange between low-temperature fresh water and ethylene glycol water; the three-way regulating valve 205 is used to adjust the final outlet temperature of glycol water to ensure the temperature of glycol water entering the low-pressure heat exchanger 106 and the high-pressure heat exchanger 109; the inlet of the three-way regulating valve 205 is equipped with a temperature transmitter TT, and the outlet is equipped with a temperature transmitter TT and a temperature controller TC; the temperature transmitter TT at the inlet of the three-way regulating valve can measure the temperature after the glycol water heat exchanger; the temperature transmitter TT and the temperature controller TC at the outlet will realize double protection control, the sampling temperature of the temperature transmitter is input to the control board to control the temperature of the glycol water for heat exchange, and the temperature controller performs temperature control protection on the heat exchange according to the set temperature, and the temperature control range can be set; The low-temperature fresh water supply pipeline includes a manual ball valve, a pressure gauge PG, a temperature gauge TG, and a temperature transmitter TT; the low-temperature fresh water from the central cooling water system enters the ethylene glycol water heat exchanger 204 through the manual ball valve through the pipeline from interface 1 5 to exchange heat with the ethylene glycol water, and the fresh water after heat exchange passes through the manual ball valve from interface 2 6 through the pipeline and then returns to the central cooling water system; the manual ball valve is used to control the entry and cutoff of fresh water; the pressure gauge PG, temperature gauge TG, and temperature transmitter TT behind interface 4 can monitor the pressure and temperature of fresh water from the local and control panel, and issue a high temperature alarm when the temperature is high.

[0022] In this embodiment, there are two methanol supply pumps 103, 105, methanol circulation pumps 110, 111, and discharge pumps 408, 409, one for use and one for backup, and they serve as backup for each other.

[0023] In this embodiment, the methanol supply pumps 103, 105 and the methanol circulation pumps 110, 111 are variable frequency pumps, and the flow rates can automatically change as the load of the ship engine changes.

[0024] In this embodiment, the mixing cylinder 108 is equipped with a low liquid level switch LS, a low-low liquid level switch LS, an exhaust back pressure valve, and a safety valve; the methanol mixing cylinder has the combined functions of automatically exhausting at a low liquid level, turning on the back pressure, and stopping exhausting at a high liquid level, and the pressure in the mixing cylinder can be maintained during exhaust.

[0025] In this embodiment, the liquid level switches of the mixing cylinder 108 and the pipeline will adopt tuning fork liquid level switches, which have higher sensitivity and are not affected by the swaying of the ship.

[0026] In this embodiment, the ethylene glycol water tank 201 is equipped with a magnetic flap liquid level gauge LI, a liquid level sensor LT, and a low liquid level switch LS; the liquid level can be directly checked through the magnetic flap liquid level gauge, the liquid level sensor transmits a 4-20mA signal to the control panel to display a 0-100% liquid level ratio, the actual synchronous liquid level can be checked remotely, and the low liquid level switch can send a low liquid level alarm.

[0027] In this embodiment, the discharge pipeline is located at the bottom layer and is purged with nitrogen. An oxygen concentration meter can be added to the external pipeline of the discharge port to measure the oxygen content to ensure that the components and pipelines are completely emptied without any methanol left to avoid air pollution.

[0028] like Figure 2 As shown, the compressed air supply process is described as follows.

[0029] Compressed air is used for the supply and operation of various pneumatic equipment and pneumatic valves. Compressed air from the control air bottle is supplied from the interface 37 and enters each branch pipeline through the manual ball valve and the air filter 501. The nitrogen filter is used to filter impurities and particulate matter in the nitrogen. The respective solenoid valves are used to control the on and off of the compressed air. The pressure reducing valve 502 is used to reduce the pressure of the compressed air entering the discharge pump.

[0030] like Figure 3 As shown, the nitrogen purge inerting process is described as follows.

[0031] Nitrogen is used for purging and inerting the methanol supply pipeline to ensure that there is no oxygen in the equipment and pipelines entering the engine, ensuring the safe operation of the engine; ensuring that manual operation and maintenance are safer and more reliable.

[0032] Before methanol is supplied and used, the methanol supply pipeline needs to be inerted, the nitrogen system needs to be operated, and the release system needs to be operated.

[0033] The nitrogen filter 301 is used to filter impurities and particulate matter in the nitrogen.

[0034] The nitrogen system is protected by a low liquid level switch and alarm, which has both cut-off and check functions to prevent methanol from returning to the nitrogen pipeline.

[0035] Pneumatic ball valves 302, 303, 304, 305 and manual ball valves are used to control the introduction and cut-off of nitrogen, and the check valve is used to control the check of methanol.

[0036] The nitrogen from the nitrogen tank is supplied from interface 48 and enters each pneumatic control branch pipeline through the manual ball valve, nitrogen filter 301, and main pneumatic ball valve 302.

[0037] One path of nitrogen is separated from the main manual ball valve and enters the discharge pipeline through the manual ball valve and check valve.

[0038] One path of nitrogen is separated from the main manual ball valve and enters the No. 1 single filter 102 and the No. 1 methanol supply pump 103 through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve.

[0039] One path of nitrogen is separated from the main manual ball valve and enters the No. 2 single filter 104 and the No. 2 methanol supply pump 105 through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve.

[0040] One path of nitrogen is separated from the main manual ball valve and enters the No. 1 methanol circulation pump 110 through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve.

[0041] One path of nitrogen is separated from the main manual ball valve and enters the No. 2 methanol circulation pump 111 through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve.

[0042] One path of nitrogen is separated from the main manual ball valve and enters the No. 1 filter cartridge of the double fine filter 112 through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve.

[0043] One path of nitrogen is separated from the main manual ball valve and enters the No. 2 filter cartridge of the double fine filter 112 through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve.

[0044] One path of nitrogen enters the nitrogen inlet pipe of the methanol supply pipeline from the pneumatic ball valve 303 and the check valve.

[0045] One path of nitrogen enters the mixing cylinder 108 from the pneumatic ball valve 304 and the check valve.

[0046] One path of nitrogen enters the discharge pipeline from the pneumatic ball valve 305 and the check valve.

[0047] The nitrogen entering the methanol supply pipeline passes through various components and pipelines in sequence, and then enters the discharge pipeline through pneumatic ball valve 401, pneumatic ball valve 402, pneumatic ball valve 403, pneumatic ball valve 404, pneumatic ball valve 405, and pneumatic ball valve 406, and finally passes through the check valve and is discharged from interface 610 to the methanol daily cabinet or the methanol discharge cabinet. When the No. 1 discharge pump 408 or the No. 2 discharge pump 409 is turned on, rapid discharge can be performed.

[0048] After a period of time, all the air in the original methanol supply pipeline is purged and discharged by nitrogen. In this way, the nitrogen purging is completed and the inerting is ended. The oxygen content can also be measured using an oxygen concentration meter at the peripheral discharge outlet.

[0049] The pressure gauge PG and pressure transmitter PT behind the nitrogen inlet 8 can monitor the nitrogen pressure locally and on the control panel. When the pressure is low, a low pressure alarm will be issued. The on and off of the liquid level switch LS can determine whether methanol has leaked into the nitrogen pipeline.

[0050] like Figure 4 As shown, the methanol supply process is described as follows.

[0051] After the methanol supply pipeline is inerted, the methanol supply pipeline can be used to supply methanol.

[0052] Methanol from the ship's methanol daily tank is sucked into the No. 1 methanol supply pump 103 from interface +1 through the pneumatic ball valve 101, the manual ball valve, the manual ball valve, and the No. 1 single filter 102, and then flows into the mixing drum 108 through the check valve, the manual ball valve, and the manual ball valve, or is sucked into the No. 2 methanol supply pump 105 from the spare pipeline through the manual ball valve, the manual ball valve, and the No. 2 single filter 104, and then flows into the mixing drum 108 through the check valve, the manual ball valve, and the manual ball valve, and then passes through the manual ball valve, the high-pressure heat exchanger 109, the manual ball valve, the manual ball valve, the No. 1 methanol circulation pump 110 or the No. 2 methanol circulation pump 111, the check valve, the manual ball valve, the manual ball valve, the double fine filter 112, the mass flow meter 114, and the pneumatic ball valve 115 in sequence, and is delivered to the engine from interface +2.

[0053] In summary, methanol is transported from interface +1 to the engine through interface +2 after primary filtration, primary pressurization, primary heat exchange, flow measurement, reflux mixing, secondary pressurization, secondary heat exchange, and secondary filtration.

[0054] Pneumatic ball valves and manual ball valves are used to control the flow of methanol and cut it off.

[0055] The inlets and outlets of methanol supply pumps 103, 105 and methanol circulation pumps 110, 112 are all equipped with double ball valve cutoffs. This double cutoff function ensures complete sealing during maintenance and can be sealed when the pump is under long-term maintenance.

[0056] The overflow pipeline of the methanol supply pumps 103 and 105 is equipped with a low-pressure heat exchanger 106 and a pressure control valve 107. The low-pressure heat exchanger 106 is used for the primary heat exchange between ethylene glycol water and methanol, that is, for heat exchange between overflow methanol and primary supply methanol. The pressure control valve 107 is used to control the methanol supply pressure. The excess methanol flows back to the front of the methanol supply pumps 103 and 105 through the low-pressure heat exchanger 106 and the pressure control valve 107 for recirculation.

[0057] The overflow pipelines of the methanol circulation pumps 110 and 112 are equipped with a pressure control valve 113, which is used to control the outlet pressure of the methanol. Excess methanol flows back to the mixing drum 108 through the pressure control valve 113 for recirculation.

[0058] The single coarse filter 102 is used for primary filtration of methanol entering the methanol supply pump 103, and the single coarse filter 104 is used for primary filtration of methanol entering the methanol supply pump 105 to remove larger impurities and particulate matter in the methanol to ensure the cleanliness requirements of the methanol entering the methanol supply pump, with a maximum filtration accuracy of up to 250um.

[0059] Methanol supply pumps 103 and 105 are used for the delivery and supply of methanol and the first-stage pressurization. The methanol supply pump is driven by a variable frequency motor. The frequency converter automatically adjusts the speed of the variable frequency motor according to the change of engine load to control the flow of the methanol supply pump. At the same time, the pressure control valve 107 controls the pressure of the pump outlet according to the pressure feedback of the pressure transmitter PT behind the methanol supply pump. The combination of the variable frequency pump and the pressure control valve makes the flow and pressure control more stable. The coupling of the methanol supply pump is a magnetic coupling, and methanol is not easy to leak.

[0060] The mixing cylinder 108 is used for the reflux mixing of methanol and is equipped with a low liquid level switch LS, a low-low liquid level switch LS, a pressure transmitter TT, a safety valve, a pneumatic ball valve 407, an exhaust back pressure valve, and a check valve. The methanol mixing cylinder 108 has a combination of automatic exhaust at low liquid level, opening back pressure, and stopping exhaust at high liquid level. The pressure in the mixing cylinder can be maintained during exhaust, making the system run more stable. The low-low liquid level alarm and expansion function have been added. When the low-low liquid level is reached, an alarm is output, the methanol supply is stopped, and the ship system automatically switches to the fuel mode, allowing the ship to continue to sail safely. The pressure transmitter can measure the pressure in the mixing cylinder and transmit it to the control panel. When the pressure in the mixing cylinder is higher than the safety valve setting value, the safety valve opens and releases pressure.

[0061] Methanol circulation pumps 110 and 111 are used for methanol transportation and secondary pressurization. The methanol circulation pump is driven by a variable frequency motor. The frequency converter automatically adjusts the speed of the variable frequency motor according to the change of engine load to control the flow of the methanol circulation pump. At the same time, the pressure control valve 113 controls the pressure of the pump outlet according to the pressure feedback of the pressure transmitter PT before the interface 92. The combination of the variable frequency pump and the pressure control valve makes the flow and pressure control more stable. The coupling of the methanol circulation pump is a magnetic coupling, and methanol is not easy to leak.

[0062] The high-pressure heat exchanger 109 is used for the secondary heat exchange between ethylene glycol water and methanol, that is, to exchange heat with the methanol delivered by the methanol circulation pumps 110 and 111. The temperature gauge TG at the inlet of the high-pressure heat exchanger 109 and the temperature gauge TG at the outlet respectively display the local temperature of the inlet and outlet. The temperature transmitter TT and the temperature controller TC at the outlet of the high-pressure heat exchanger 109 will realize double protection control. The sampling temperature of the temperature transmitter is input to the control board to control the temperature of the methanol being exchanged. The temperature controller performs temperature control protection on the heat exchange according to the set temperature. The temperature control range can be set. In this way, double protection control is performed to make the temperature control function safer and more reliable.

[0063] The double fine filter 112 is used for secondary filtration of methanol entering the engine, removing fine impurities and particulate matter in the methanol, ensuring the cleanliness requirements of the methanol entering the engine, and the maximum filtration accuracy can reach 10um. The methanol double filter has added a double cut-off function. The double fine filter has two filter cartridges. The valves leading to the two filter cartridges must be operated in strict sequence to ensure the sealing, safety and reliability of each filter cartridge, and ensure that there is no cross-flow between the two filter cartridges. This will be safer and more reliable during manual operation and maintenance, protecting the environment, life safety and human health. Each operating position is equipped with an indicator for easier operation.

[0064] The flow meter 114 is a mass flow meter, which is used for flow measurement, that is, measuring the consumption of the generator. The measurement items include mass flow, volume flow, temperature, and density. The flow is divided into instantaneous flow and accumulated flow.

[0065] like Figure 3 The methanol release process is described as follows.

[0066] When the ship needs to stop the methanol supply, the methanol supply pumps 102, 104 and the methanol circulation pumps 110, 111 are stopped. The pneumatic ball valves 401, 402, 403, 404, 405, 406 of the discharge pipeline are opened in sequence, and methanol flows into the discharge pipeline. At this time, the liquid level switch LS of the discharge pipeline triggers the high liquid level alarm, and the system automatically starts the discharge pumps 408, 409, and methanol flows from the discharge port into the methanol daily tank or the methanol discharge tank.

[0067] The discharge is discharged by two discharge pumps and one gravity discharge, and the discharge pipeline is located at the lowest level to ensure that the discharge of equipment and pipelines can flow in. The discharge pump is a pneumatic diaphragm pump, one discharge pump is working and the other is standby.

[0068] Pneumatic ball valves and manual ball valves are used to control the entry and cutoff of discharge, and check valves are used to control the check of the discharge pipeline.

[0069] When the discharge line liquid level switch LS triggers a low liquid level signal, nitrogen is used for purging and inerting. The process is the same as the "Nitrogen Purging Inerting Process".

[0070] An oxygen concentration meter can be used to measure the oxygen content at the peripheral discharge outlet to ensure that the components and pipelines are completely emptied and no methanol is left to avoid air pollution and to ensure that it will not affect the maintenance, operation, health and safety of personnel.

[0071] When the pressure difference of the double fine filter 112 exceeds the alarm value, it is necessary to perform relevant operations on the double fine filter, switch the valve, switch to the spare filter cartridge, and discharge, nitrogen purge, disassemble, inspect, clean the filter element, and reinstall the original working filter cartridge according to the process. Then, nitrogen is introduced into the original working filter cartridge to purge the internal air with nitrogen. After the inerting is completed, the nitrogen is retained for pressure testing to confirm whether the pressure is maintained.

[0072] like Figure 5 As shown, the glycol water supply process is described as follows.

[0073] Before methanol is supplied and used, low-temperature fresh water pipelines and ethylene glycol water pipelines need to be operated to prepare for methanol heat exchange in advance.

[0074] The concentration of ethylene glycol aqueous solution is increased from the general 20%~35% to 50%, so that the antifreeze temperature of ethylene glycol water in use is lower, and the temperature of methanol daily cabinet will be reduced from -10℃ to -25℃, which is particularly suitable for ships with methanol daily cabinets installed on the deck and side, and sailing in extremely cold winters and ice areas, because the temperature of methanol daily cabinets will be extremely low after freezing in the cold wind. After lowering the design temperature, it will better expand the time and navigation range of ships using methanol, use methanol fuel for a longer time, better reduce air emission pollution caused by burning fuel, and make ship navigation more environmentally friendly.

[0075] The ethylene glycol water enters the ethylene glycol water tank 201 from the interface 3 through the manual ball valve, and the air in the ethylene glycol water tank is discharged to the atmosphere through the pipeline from the interface 84 through the manual ball valve.

[0076] The ethylene glycol water in the ethylene glycol water tank 201 passes through a manual ball valve, No. 1 ethylene glycol water pump 202, and a manual ball valve, or passes through a manual ball valve of a spare pipeline, No. 2 ethylene glycol water pump 203, and a manual ball valve, and then passes through an ethylene glycol water heat exchanger 204, a manual ball valve, and a three-way regulating valve 205 and is divided into two paths; one path of ethylene glycol water enters the low-pressure heat exchanger 106 through a manual ball valve, and then returns to the ethylene glycol water tank 201 through a manual ball valve, a check valve, and a throttle valve 206; one path of ethylene glycol water enters the high-pressure heat exchanger 109 through a manual ball valve, and then returns to the ethylene glycol water tank 201 through a manual ball valve, a check valve, and a throttle valve 206, and the ethylene glycol water is circulated.

[0077] The manual ball valve is used to control the flow of ethylene glycol water and the check valve is used to control the check of the two-way ethylene glycol water circuit.

[0078] The glycol water tank 201 is equipped with a temperature transmitter TT, a liquid level switch LS, a magnetic flap level gauge LI, a liquid level sensor LS, a manual ball valve, etc. The liquid level can be directly viewed locally through the magnetic flap level gauge, and the liquid level sensor transmits a 4-20mA signal to the control panel to display a 0-100% liquid level ratio. The actual synchronous liquid level can be viewed remotely, and the low liquid level switch can send a low liquid level alarm. Because the glycol water tank is normally open to air, the added functions are more guaranteed, and the state of the glycol water tank can be directly viewed and paid attention to. The lack of glycol water can be manually supplemented through observation of actual needs, which is convenient for use.

[0079] The glycol water heat exchanger 204 is used for heat exchange between low-temperature fresh water and glycol water.

[0080] The three-way regulating valve 205 is used to adjust the final outlet temperature of the glycol water to ensure the temperature of the glycol water entering the low-pressure heat exchanger 106 and the high-pressure heat exchanger 109 .

[0081] The inlet of the three-way regulating valve 205 is equipped with a temperature transmitter TT, and the outlet is equipped with a temperature transmitter TT and a temperature controller TC. The temperature transmitter TT at the inlet of the three-way regulating valve can measure the temperature after the glycol water heat exchanger; the temperature transmitter TT and the temperature controller TC at the outlet will realize double protection control. The sampling temperature of the temperature transmitter is input to the control board to control the temperature of the glycol water for heat exchange. The temperature controller performs temperature control protection on the heat exchange according to the set temperature, and the temperature control range can be set. Double protection control in this way makes the temperature control function safer and more reliable.

[0082] like Figure 5 As shown, the low-temperature fresh water supply process is described as follows.

[0083] Before methanol is supplied and used, it is also necessary to operate the low-temperature fresh water pipeline to prepare in advance for the heat exchange between ethylene glycol water and methanol.

[0084] The low-temperature fresh water from the central cooling water system enters the glycol water heat exchanger 204 from interface 1 5 through a manual ball valve and a pipeline to exchange heat with the glycol water. The fresh water after heat exchange passes through a manual ball valve from interface 2 6 through a pipeline and then returns to the central cooling water system.

[0085] Manual ball valve is used to control the flow and cut-off of fresh water.

[0086] The pressure gauge PG, temperature gauge TG and temperature transmitter TT behind the interface 1-5 can monitor the pressure and temperature of fresh water locally and on the control panel, and issue a high temperature alarm when the temperature is high.

[0087] From the overall principle diagram Figure 1It can be seen from the above that the pressure gauge PG installed on the pipeline can display the pressure of each point locally, the temperature gauge TG can display the temperature of each point locally, the pressure transmitter PT can transmit the pressure signal in the pipeline to the control panel to display the pressure of each point, the temperature transmitter TT can transmit the temperature signal in the pipeline to the control panel to display the temperature of each point, the liquid level switch LS can transmit the liquid level signal to the control panel to display the liquid level on / off status of each point, the magnetic flap level gauge LI can display the liquid level height locally, and the liquid level sensor LT can transmit the liquid level signal to the control panel to display the actual liquid level height.

[0088] The liquid level switch LS is a tuning fork liquid level switch with higher sensitivity and is not affected by the swaying of the ship. As long as the liquid contacts the two tuning forks, an on-off signal is generated and a judgment is given, making the ship's navigation less affected by waves and mechanical failures and more safe and reliable.

[0089] The purpose of the present invention is to make the control function more intelligent, safe and reliable, solve the problems caused by various factors such as changes in ship speed, engine power and engine consumption, and better ensure the control and application of flow, pressure and temperature.

[0090] The present invention has a reasonable structure. Compared with the previous design, the new design adds multiple intelligent functions, improves the safety performance, and is more intelligent, safe and reliable, as stated below: The methanol supply pump, methanol circulation pump and discharge pump are usually designed as single pumps without backup function. The pumps in the newly designed methanol supply unit are designed as double pumps, including two methanol supply pumps 103 and 105, two methanol circulation pumps 110 and 111, and two discharge pumps 408 and 409, one for use and one for backup, which ensures the continuity and reliability of operation.

[0091] In general designs, only the pressure control valve is used for pressure regulation, and the pump is a fixed frequency pump. The newly designed methanol supply pumps 103, 105 and methanol circulation pumps 110, 111 are variable frequency pumps, and the flow rate can automatically change with the demand of the ship engine load change. The combination of variable frequency pump and pressure control valve makes the flow and pressure control more stable, which is suitable for situations where the main engine load changes greatly, and has a backup function, overcoming the disadvantage of being unable to regulate pressure due to pressure control valve failure. For example: methanol supply pump 103 or 105 is combined with pressure control valve 107 and pressure transmitter PT, and methanol circulation pump 110 or 111 is combined with pressure control valve 113 and pressure transmitter PT.

[0092] The commonly designed methanol mixing cylinder only has a low liquid level switch and alarm, and there is no pressure protection during exhaust and release. The newly designed methanol mixing cylinder 108 is equipped with a low liquid level switch LS, a low-low liquid level switch LS, an exhaust back pressure valve, and a safety valve; the methanol mixing cylinder automatically exhausts at low liquid levels, opens back pressure, and stops exhausting at high liquid levels. The pressure in the mixing cylinder can be maintained during exhaust, making the system run more stable; a low-low liquid level alarm and expansion function are added, and an alarm is output at low-low liquid levels, methanol supply is stopped, and the ship system automatically switches to fuel mode, allowing the ship to continue to sail safely.

[0093] Liquid level switches generally use mechanical floats. Although they are cheap, float-type liquid level switches are prone to failure after frequent operation, and lose their operation and alarm functions. In the new design, the liquid level switches for methanol mixing cylinders and pipelines will use tuning fork liquid level switches, which are more sensitive and not affected by the swaying of the ship. As long as the liquid touches the two tuning forks, an on-off signal is generated and a judgment is given, making the ship's navigation less affected by waves and mechanical failures, and more safe and reliable.

[0094] Generally, the double fine filter only has the direct conversion function, but cannot guarantee the internal sealing and safety. The newly designed methanol double fine filter 112 has added the double cut-off option function. The double fine filter has two filter cartridges. The valves leading to the two filter cartridges must be operated in strict sequence to ensure the sealing, safety and reliability of each filter cartridge. This makes manual operation and maintenance safer and more reliable, protecting the environment, life safety and human health. Each operating position is equipped with an indicator for easier operation.

[0095] Generally, the temperature control mode is relatively simple, and there is only one sensor, which makes it easy for control interruption to occur. The temperature control mode in the new design adopts dual protection control. The terminal heat exchange application is equipped with a temperature transmitter TT and a temperature controller TC. The temperature transmitter samples the temperature and inputs it into the control board to control the heat exchange. The temperature controller performs temperature control protection on the heat exchange according to the set temperature. The temperature control range can be set. In this way, dual protection control makes the temperature control function safer and more reliable. For example: the combination of the temperature transmitter TT and the temperature controller TC at the outlet of the high-pressure heat exchanger 109, and the combination of the temperature transmitter TT and the temperature controller TC at the outlet of the glycol water three-way regulating valve 204.

[0096] The general ethylene glycol water tank is only designed with a liquid level switch, which can only send out a liquid level alarm at a fixed point, and the actual liquid level cannot be viewed locally or remotely. The newly designed ethylene glycol water tank 201 is equipped with a magnetic flap level gauge LI, a liquid level sensor LT, and a low liquid level switch LS. The liquid level can be viewed directly locally through the magnetic flap level gauge, and the liquid level sensor transmits a 4-20mA signal to the control panel to display a 0-100% liquid level ratio. The actual synchronous liquid level can be viewed remotely, and the low liquid level switch can send a low liquid level alarm. Because the ethylene glycol water tank is normally open to air, the added functions are more guaranteed, and the status of the ethylene glycol water tank can be viewed directly and paid attention to. The lack of ethylene glycol water can be manually supplemented through observation of actual needs, which is convenient for use.

[0097] The concentration of ethylene glycol aqueous solution is generally designed to be 20%~35%, and the antifreeze temperature can only be used in seasons and areas with slightly colder temperatures. The concentration of ethylene glycol aqueous solution in the new design is increased from the general 20%~35% to 50%, making the antifreeze temperature of ethylene glycol water lower during use, and the temperature of methanol daily cabinet will be reduced from -10℃ to -25℃, which is particularly suitable for methanol daily cabinets installed on the deck and side, and for ships sailing in extremely cold winters and ice areas, because at this time the temperature of methanol daily cabinets will be extremely low after freezing in the cold wind. After lowering the design temperature, it will better expand the time and navigation range of ships using methanol, use methanol fuel for a longer time, better reduce air emission pollution caused by burning fuel, and make ship navigation more environmentally friendly.

[0098] In the past, the discharge was done by gravity, but if the gravity was not enough or the pipeline was not smooth enough, the discharge would be incomplete; or the designed discharge pump had only one way, and when a failure occurred, the power discharge could not be used. The new design uses two diaphragm discharge pumps 408 and 409 for discharge and one way for gravity discharge, each with a check valve, and the discharge pipeline is located at the bottom layer, using nitrogen to purge. The oxygen concentration meter can be added to the external pipeline of the discharge port to measure the oxygen content, ensuring that the components and pipelines are completely emptied, without methanol residue, to avoid air pollution, and to ensure that it will not affect the maintenance, operation, health and safety of personnel.

[0099] In the past, the general design of nitrogen purge system valves only had a single shutoff valve and no check valve. The new design of nitrogen system protection is equipped with a low liquid level switch and alarm, with shutoff and check functions to prevent methanol from returning to the nitrogen pipeline.

[0100] Generally, differential pressure switches or differential pressure sensors are used at the inlet and outlet of the filter to determine whether the filter is clogged. Electrical explosion-proof is required in explosion-proof areas. The single-joint coarse filters 102 and 104 in the new design can be replaced with differential pressure gauges, which are purely mechanical and do not require electrical explosion-proof. The use of explosion-proof differential pressure switches or differential pressure sensors is avoided, saving costs. This single-joint coarse filter usually does not clog and only needs to be checked and cleaned regularly by humans.

[0101] In our new design, the addition of various control functions has improved the intelligence and safety of the ship, and has better emissions to the international and domestic air environment, allowing the goals of carbon peak, carbon neutrality and the International Maritime Organization to be achieved at an early date.

[0102] This intelligent safety-controlled marine methanol supply unit combines the required equipment into an independent device with a compact structure, reliable connection, easy installation, commissioning, use and maintenance, and is conducive to centralized management and control.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent and safe controlled marine methanol supply unit, characterized in that: Including compressed air supply pipeline, nitrogen supply pipeline, methanol supply pipeline, methanol discharge pipeline, glycol water supply pipeline and low-temperature fresh water supply pipeline; The compressed air supply pipe includes a manual ball valve, an air filter (501), an electromagnetic pressure reducing valve (502), a pressure gauge PG, a pressure transmitter PT, a pressure control valve (107, 113), a three-way regulating valve (205), a pneumatic ball valve (101, 115, 302, 303, 304, 305, 401, 402, 403, 404, 405, 406, 407), and a discharge pump (408, 409); One side of the compressed air supply pipe is connected to the third interface (7); the third interface (7) is used to supply the compressed air in the air bottle, and enters each branch pipeline through the manual ball valve and the air filter (501) in sequence; the air filter (501) is used to filter impurities and particulate matter in the nitrogen, the respective pneumatic ball valves are used to control the on and off of the compressed air, and the electromagnetic pressure reducing valve (502) is used to reduce the pressure of the compressed air entering the discharge pump (408, 409); The nitrogen supply pipeline comprises a nitrogen filter (301), a pneumatic ball valve (302, 303, 304, 305), a manual ball valve, a check valve, a pressure gauge PG, a pressure transmitter PT, and a liquid level switch LS; the nitrogen filter (301) is used to filter impurities and particulate matter in the nitrogen; the pneumatic ball valve (302, 303, 304, 305) and the manual ball valve are used to control the introduction and cut-off of nitrogen, and the check valve is used to control the check of methanol; the nitrogen is supplied from the interface (8) and enters each pneumatic control branch pipeline via the manual ball valve, the nitrogen filter (301), and the pneumatic ball valve (302); the pressure gauge PG and the pressure transmitter PT behind the nitrogen inlet four (8) can monitor the nitrogen pressure locally and from the control panel, and a low pressure alarm is issued when the pressure is low; the on and off of the liquid level switch LS can determine whether methanol has leaked into the nitrogen pipeline; The methanol supply pipeline comprises a single coarse filter (102, 104), a methanol supply pump (103, 105), a low-pressure heat exchanger (106), a pressure control valve (107), a mixing cylinder (108), a high-pressure heat exchanger (109), a methanol circulation pump (110, 111), a double fine filter (112), a pressure control valve (113), a flow meter (114), a pneumatic ball valve (101, 115), a manual ball valve, a back pressure valve, a safety valve, a pressure gauge, a pressure transmitter, a temperature gauge, a temperature transmitter, a temperature switch, and a liquid level switch; The single coarse filter (102) is used for primary filtration of methanol entering the methanol supply pump (103), and the single coarse filter (104) is used for primary filtration of methanol entering the methanol supply pump (105) to remove larger impurities and particles in the methanol, thereby ensuring the cleanliness requirements of the methanol entering the methanol supply pump; The methanol supply pump (103, 105) is used for the delivery and supply of methanol and primary pressurization; The mixing cylinder (108) is used for reflux mixing of methanol and is equipped with a low liquid level switch LS, a low-low liquid level switch LS, a pressure transmitter TT, a safety valve, an exhaust pneumatic ball valve (407), an exhaust back pressure valve, and a check valve; the mixing cylinder (108) has a combined function of automatically exhausting at a low liquid level, opening the back pressure, and stopping exhausting at a high liquid level; The methanol circulation pump (110, 111) is used for transporting methanol and for secondary pressurization. The methanol circulation pump is driven by a variable frequency motor. The frequency converter automatically adjusts the speed of the variable frequency motor according to changes in engine load to control the flow rate of the methanol circulation pump. At the same time, the pressure control valve (113) controls the pressure at the pump outlet according to the pressure feedback of the pressure transmitter PT before the methanol outlet (2); The high-pressure heat exchanger (109) is used for secondary heat exchange between ethylene glycol water and methanol, that is, to perform heat exchange on the methanol delivered by the methanol circulation pumps (110, 111); the temperature gauge TG at the inlet of the high-pressure heat exchanger (109) and the temperature gauge TG at the outlet respectively display the local temperatures at the inlet and outlet, and the temperature transmitter TT and the temperature controller TC at the outlet of the high-pressure heat exchanger (109) will realize dual protection control, the sampling temperature of the temperature transmitter is input to the control board to perform temperature control on the methanol being exchanged, and the temperature controller performs temperature control protection on the heat exchange according to the set temperature, and the temperature control range can be set; The dual fine filter (112) is used for secondary filtration of methanol entering the engine to remove fine impurities and particulate matter in the methanol, thereby ensuring the cleanliness requirements of the methanol entering the engine; the flow meter (114) is used for flow measurement, that is, measuring the consumption of the generator, specifically including mass flow, volume flow, temperature, and density, and the flow is divided into instantaneous flow and cumulative flow; The methanol discharge pipeline includes a discharge pump (408, 409), a pneumatic ball valve (401, 402, 403, 404, 405, 406, 407), a manual ball valve, a check valve, a sight glass, a pressure gauge PG, and a liquid level switch LS; and the discharge pipeline is located at the bottom layer to ensure that the discharge of the equipment and pipelines can flow in; the discharge pump is a pneumatic diaphragm pump, one discharge pump is working and the other is standby, the pneumatic ball valve and the manual ball valve are used to control the discharge in and out, and the check valve is used to control the check of the discharge pipeline; the peripheral discharge outlet uses an oxygen concentration measuring instrument to measure the oxygen content to ensure that the components and pipelines are completely emptied and no methanol is left, so as to avoid air pollution and ensure that it will not affect the maintenance, operation, health and safety of personnel; The glycol water supply pipeline comprises an ethylene glycol water tank (201), an ethylene glycol water pump (202, 203), an ethylene glycol water heat exchanger (204), a three-way regulating valve (205), a throttle valve (206), a manual ball valve, a check valve, a pressure gauge PG, a pressure transmitter PT, a temperature gauge TG, a temperature transmitter TT, a temperature switch TS, a magnetic flap liquid level gauge LI, a liquid level transmitter LT, and a liquid level switch LS; The ethylene glycol water enters the ethylene glycol water tank (201) from the interface (3) through the manual ball valve, and the air in the ethylene glycol water tank is discharged to the atmosphere through the pipeline from the interface eight (4) through the manual ball valve; The ethylene glycol water in the ethylene glycol water tank (201) passes through a manual ball valve, a No. 1 ethylene glycol water pump (202), a manual ball valve, or passes through a manual ball valve of a spare pipeline, a No. 2 ethylene glycol water pump (203), a manual ball valve, and then passes through an ethylene glycol water heat exchanger (204), a manual ball valve, and a three-way regulating valve (205) and is divided into two paths; one path of the ethylene glycol water enters the low-pressure heat exchanger (106) through the manual ball valve, and then returns to the ethylene glycol water tank (201) through the manual ball valve, a check valve, and a throttle valve (206); the other path of the ethylene glycol water enters the high-pressure heat exchanger (109) through the manual ball valve, and then returns to the ethylene glycol water tank (201) through the manual ball valve, a check valve, and a throttle valve (206), and the ethylene glycol water is circulated; The manual ball valve is used to control the flow and cut-off of glycol water, and the check valve is used to control the check of the two-way glycol water circuit; The glycol water tank (201) is equipped with a temperature transmitter TT, a liquid level switch LS, a magnetic flap liquid level gauge LI, a liquid level sensor LS, and a manual ball valve; the glycol water heat exchanger (204) is used for heat exchange between low-temperature fresh water and glycol water; the glycol water heat exchanger (204) is used for heat exchange between low-temperature fresh water and glycol water; the inlet of the three-way regulating valve (205) is equipped with a temperature transmitter TT, and the outlet is equipped with a temperature transmitter TT and a temperature controller TC; the temperature transmitter TT at the inlet of the three-way regulating valve can measure the temperature after the glycol water heat exchanger; The glycol water heat exchanger (204) is used for heat exchange between low-temperature fresh water and glycol water; The three-way regulating valve (205) is used to adjust the final outlet temperature of the glycol water to ensure the temperature of the glycol water entering the low-pressure heat exchanger (106) and the high-pressure heat exchanger (109); The three-way regulating valve (205) is provided with a temperature transmitter TT at the inlet, and a temperature transmitter TT and a temperature controller TC at the outlet; the temperature transmitter TT at the inlet of the three-way regulating valve can measure the temperature after the glycol water heat exchanger; the temperature transmitter TT and the temperature controller TC at the outlet will realize double protection control, the sampling temperature of the temperature transmitter is input to the control board to control the temperature of the glycol water for heat exchange, and the temperature controller performs temperature control protection on the heat exchange according to the set temperature, and the temperature control range can be set; The low-temperature fresh water supply pipeline includes a manual ball valve, a pressure gauge PG, a temperature gauge TG, and a temperature transmitter TT; the low-temperature fresh water from the central cooling water system enters the glycol water heat exchanger (204) from the interface 1 (5) through the manual ball valve through the pipeline to exchange heat with the glycol water, and the fresh water after heat exchange passes through the manual ball valve from the interface 2 (6) through the pipeline and then returns to the central cooling water system; the manual ball valve is used to control the entry and cut-off of fresh water; The pressure gauge PG, temperature gauge TG and temperature transmitter TT behind the interface (4) can monitor the pressure and temperature of fresh water locally and on the control panel, and issue a high temperature alarm when the temperature is high.

2. The intelligent safety-controlled marine methanol supply unit according to claim 1, characterized in that: The methanol supply pump (103, 105), the methanol circulation pump (110, 111), and the discharge pump (408, 409) are each provided in two units, one for use and one for backup, and serve as backup for each other.

3. The intelligent safety-controlled marine methanol supply unit according to claim 1, characterized in that: The methanol supply pump (103, 105) and the methanol circulation pump (110, 111) are variable frequency pumps, and the flow rates can automatically change in response to changes in the load of the ship's engine.

4. The intelligent safety-controlled marine methanol supply unit according to claim 1, characterized in that: The mixing cylinder (108) is equipped with a low liquid level switch LS, a low-low liquid level switch LS, an exhaust back pressure valve, and a safety valve; the methanol mixing cylinder has a combined function of automatically exhausting when the liquid level is low, opening the back pressure, and stopping the exhaust when the liquid level is high, and the pressure in the mixing cylinder can be maintained during exhaust.

5. The intelligent safety-controlled marine methanol supply unit according to claim 1, characterized in that: The liquid level switches of the mixing cylinder (108) and the pipeline will adopt tuning fork liquid level switches, which have higher sensitivity and are not affected by the swaying of the ship.

6. The intelligent safety-controlled marine methanol supply unit according to claim 1, characterized in that: The ethylene glycol water tank (201) is equipped with a magnetic flap level gauge LI, a level sensor LT, and a low level switch LS; the liquid level can be directly checked through the magnetic flap level gauge, the level sensor transmits a 4-20mA signal to the control panel to display a 0-100% liquid level ratio, the actual synchronous liquid level can be checked remotely, and the low level switch can send a low level alarm.

7. The intelligent safety-controlled marine methanol supply unit according to claim 1, characterized in that: The discharge pipeline is located at the bottom layer and is purged with nitrogen. An oxygen concentration meter can be added to the external pipeline of the discharge port to measure the oxygen content to ensure that the components and pipelines are completely emptied without any methanol left to avoid air pollution.

8. A control method for a marine methanol supply unit with intelligent safety control, characterized in that: The specific working method is as follows: Step 1: Compressed air from the control air bottle is supplied from interface 3 (7) and enters each branch pipeline through the manual ball valve and air filter (501); Step 2: Before methanol is supplied and used, the methanol supply pipeline needs to be inerted, the nitrogen system needs to be operated, and the release system needs to be operated; Step 3: After the methanol supply pipeline is inerted, the methanol supply pipeline can be used to supply methanol; Step 4: When the ship needs to stop the methanol supply, stop the methanol supply pump (102, 104) and the methanol circulation pump (110, 111); open the pneumatic ball valves (401, 402, 403, 404, 405, 406) of the discharge pipeline in sequence, and methanol flows into the discharge pipeline. At this time, the liquid level switch LS of the discharge pipeline triggers the high liquid level alarm, and the system automatically starts the discharge pump (408, 409), and methanol flows into the methanol daily cabinet or the methanol discharge cabinet from the discharge port; when the discharge pipeline liquid level switch L S triggers a low liquid level signal, and nitrogen is used for purging and inerting. The process is the same as the "Nitrogen Purging Inerting Process". When the pressure difference of the double fine filter (112) exceeds the alarm value, it is necessary to perform relevant operations on the double fine filter, switch the valve, switch to the spare filter cartridge, and discharge, nitrogen purge, disassemble, inspect, clean the filter element, and reinstall the original working filter cartridge according to the process. Then, nitrogen is introduced into the original working filter cartridge to purge the internal air with nitrogen. After the inerting is completed, the nitrogen is retained for pressure testing to confirm whether the pressure is maintained. Step 5: Glycol water supply. Before methanol is supplied and used, the glycol water pipeline needs to be operated to prepare for methanol heat exchange in advance. Step 6: Low-temperature fresh water supply. Before methanol is supplied and used, the low-temperature fresh water pipeline needs to be operated to prepare for methanol heat exchange in advance.

9. The intelligent safety-controlled marine methanol supply unit according to claim 8, characterized in that: In step 2, nitrogen from a nitrogen tank is supplied from interface 4 (8), and enters each pneumatic control branch pipeline via a manual ball valve, a nitrogen filter (301), and a main pneumatic ball valve (302); One channel of nitrogen is separated from the main manual ball valve and enters the discharge pipeline through the manual ball valve and check valve; One nitrogen path is separated from the main manual ball valve and enters the No. 1 single filter (102) and the No. 1 methanol supply pump (103) through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve; One nitrogen path is separated from the main manual ball valve and enters the No. 2 single filter (104) and the No. 2 methanol supply pump (105) through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve; One nitrogen path is separated from the main manual ball valve and enters the No. 1 methanol circulation pump (110) through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve; One nitrogen path is separated from the main manual ball valve and enters the No. 2 methanol circulation pump (111) through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve; One path of nitrogen is separated from the main manual ball valve and enters the No. 1 filter cartridge of the double fine filter (112) through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve; One nitrogen path is separated from the main manual ball valve and enters the No. 2 filter cartridge of the double fine filter (112) through the manual ball valve and the check valve, and then enters the discharge pipeline through the manual ball valve, the sight glass and the check valve; One path of nitrogen enters the nitrogen inlet pipe of the methanol supply pipeline through the pneumatic ball valve (303) and the check valve; One path of nitrogen enters the mixing cylinder (108) from the pneumatic ball valve (304) and the check valve; One path of nitrogen enters the discharge pipeline from the pneumatic ball valve (305) and the check valve; The nitrogen entering the methanol supply pipeline passes through various components and pipelines in sequence, and then enters the discharge pipeline through the pneumatic ball valve (401), the pneumatic ball valve (402), the pneumatic ball valve (403), the pneumatic ball valve (404), the pneumatic ball valve (405), and the pneumatic ball valve (406), and finally passes through the check valve and is discharged from the interface six (10) to the methanol daily cabinet or the methanol discharge cabinet; when the No. 1 discharge pump (408) or the No. 2 discharge pump (409) is turned on, rapid discharge can be performed; After a period of time, all the air in the original methanol supply pipeline is purged and discharged by nitrogen. In this way, the nitrogen purging is completed and the inerting is ended. The oxygen content can also be measured using an oxygen concentration meter at the peripheral discharge outlet.

10. The intelligent safety-controlled marine methanol supply unit according to claim 8, characterized in that: In the step 3, the methanol from the ship's methanol daily tank is sucked from the interface 10 (1) through the pneumatic ball valve (101), the manual ball valve, the manual ball valve, the No. 1 single filter (102) by the No. 1 methanol supply pump (103), and then flows into the mixing barrel (108) through the check valve, the manual ball valve, and the manual ball valve, or from the spare pipeline through the manual ball valve, the manual ball valve, the No. 2 single filter (104) by the No. 2 methanol supply pump (105), and then flows into the mixing barrel (108) through the check valve, the manual ball valve, and the manual ball valve, and then passes through the manual ball valve, the high-pressure heat exchanger (109), the manual ball valve, the manual ball valve, the No. 1 methanol circulation pump (110) or the No. 2 methanol circulation pump (111), the check valve, the manual ball valve, the manual ball valve, the double fine filter (112), the mass flow meter (114), and the pneumatic ball valve (115) in sequence, and is transported from the interface 9 (2) to the engine; The inlet and outlet of the methanol supply pump (103, 105) and the methanol circulation pump (110, 112) are both equipped with double ball valves to ensure complete sealing during maintenance and can be sealed when the pump is under long-term maintenance; The overflow pipeline of the methanol supply pump (103, 105) is equipped with a low-pressure heat exchanger (106) and a pressure control valve (107); the low-pressure heat exchanger (106) is used for primary heat exchange between ethylene glycol water and methanol, that is, heat exchange between overflow methanol and primary supply methanol; the pressure control valve (107) is used to control the methanol supply pressure, and the excess methanol flows back to the front of the methanol supply pump (103, 105) through the low-pressure heat exchanger (106) and the pressure control valve (107) for recirculation; The methanol supply pump (103, 105) is used for the delivery and supply of methanol and the first-stage pressurization. The methanol supply pump is driven by a variable frequency motor. The frequency converter automatically adjusts the speed of the variable frequency motor according to the change of the engine load to control the flow of the methanol supply pump. At the same time, the pressure control valve (107) controls the pressure of the pump outlet according to the pressure feedback of the pressure transmitter PT behind the methanol supply pump. The combination of the variable frequency pump and the pressure control valve makes the flow and pressure control more stable. The coupling of the methanol supply pump is a magnetic coupling, and methanol is not easy to leak.

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