CN114635815A - Methanol fuel supply system and control method thereof - Google Patents

Methanol fuel supply system and control method thereof Download PDF

Info

Publication number
CN114635815A
CN114635815A CN202210348019.XA CN202210348019A CN114635815A CN 114635815 A CN114635815 A CN 114635815A CN 202210348019 A CN202210348019 A CN 202210348019A CN 114635815 A CN114635815 A CN 114635815A
Authority
CN
China
Prior art keywords
fuel
pipeline
methanol
pressure
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210348019.XA
Other languages
Chinese (zh)
Other versions
CN114635815B (en
Inventor
孙瑞
王杨志
刘建成
赵立玉
张家茂
司徒颖峰
杨威
黄朝俊
许正杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yiu Lian Dockyards (shekou) Ltd
China Merchants Heavy Industry Shenzhen Co Ltd
Original Assignee
Yiu Lian Dockyards (shekou) Ltd
China Merchants Heavy Industry Shenzhen Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yiu Lian Dockyards (shekou) Ltd, China Merchants Heavy Industry Shenzhen Co Ltd filed Critical Yiu Lian Dockyards (shekou) Ltd
Priority to CN202210348019.XA priority Critical patent/CN114635815B/en
Publication of CN114635815A publication Critical patent/CN114635815A/en
Application granted granted Critical
Publication of CN114635815B publication Critical patent/CN114635815B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating or supervising devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/025—Adding water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Abstract

The invention discloses a methanol fuel supply system, which comprises a fuel tank, a first fuel pipeline, a mixing tank, a second fuel pipeline, a host and a fuel recovery pipeline which are connected in sequence, wherein the tail end of the fuel recovery pipeline is connected with the fuel tank; the first fuel pipeline is used for carrying out first-stage temperature rise and pressure rise on the methanol in the fuel tank; the second fuel pipeline is used for carrying out second-stage temperature rise and pressure rise on the methanol in the mixing tank; the fuel recovery pipeline is used for recovering the methanol in the pipeline to the fuel tank, so that the recovery and the reutilization of the fuel are realized; inert gas lines for inerting the lines are also provided on the fuel tank, the mixing tank and the second fuel line. The methanol fuel supply system is provided with the mixing tank, can buffer the methanol fuel, and can eliminate air resistance caused by accumulation and evaporation of the fuel during transportation. Meanwhile, the fuel system has more comprehensive functions, and the safety and the stability of the operation of the system are improved.

Description

Methanol fuel supply system and control method thereof
Technical Field
The invention relates to the field of ship power systems, in particular to a methanol fuel supply system and a control method thereof.
Background
The international maritime organization passes through a preliminary strategy of emission reduction of greenhouse gases of ships in 2018, and proposes a vision of realizing zero emission of the greenhouse gases in international maritime transport in the present century, a host (5) of a large ship is gradually increased to be converted from traditional diesel oil and heavy oil into various clean low-carbon energy sources serving as fuels, the main energy sources used and developed at present are LNG and LPG, but the LNG and LPG are still fossil energy sources and can only be used as a scheme for reducing carbon in intermediate transition, and at the moment, methanol is separated as a low-carbon energy source and becomes a more ideal fuel which further accords with zero emission.
Although the traditional coal-to-methanol technology is mature, compared with the conventional diesel fuel, the carbon reduction is only 10% -15%, the effect is not obvious, but from the consideration of the whole life cycle, if the green methanol prepared by biomass/direct air carbon capture can be considered as 100% carbon reduction.
Because methanol is liquid at normal temperature, is easy to store and low in supply pressure, the methanol fuel is a lower-cost alternative fuel solution, but the methanol fuel has high vaporization latent heat and a flash point of 12 ℃, so that the low-temperature starting performance of the methanol fuel is poor, and corresponding heating measures are required in winter; when the temperature is higher, the methanol is easy to form air resistance in an oil path, so that the oil supply is not smooth; methanol is toxic and inflammable, and the steam of the methanol can form an explosive mixture with air; therefore, there is a need to overcome the above problems when using methanol as a fuel. The patent provides a control method of a methanol fuel supply system aiming at the characteristics of methanol fuel.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art, and provides a methanol fuel supply system, which comprises a fuel tank, a first fuel pipeline, a mixing tank, a second fuel pipeline, a main machine and a fuel recovery pipeline which are connected in sequence, wherein the tail end of the fuel recovery pipeline is connected with the fuel tank; the first fuel pipeline is used for carrying out first-stage temperature rise and pressure rise on the methanol in the fuel tank; the second fuel pipeline is used for carrying out second-stage temperature rise and pressure rise on the methanol in the mixing tank; the fuel recovery pipeline is used for recovering the methanol in the pipeline to the fuel tank, so that the recovery and the reutilization of the fuel are realized; inert gas lines for inerting the lines are also provided on the fuel tank, the mixing tank and the second fuel line.
The fuel tank is used for containing methanol; the fuel tank is provided with an inert gas pipeline, namely a first nitrogen pipe and a first high-speed ventilation head, and is provided with two backflow pipe openings, a filling pipe, a liquid outlet pipe and two residue discharge openings, the interior of the fuel tank is divided into two parts by a partition plate, the right side is provided with the two backflow pipe openings and the filling pipe, backflow and filling media respectively enter the right side of the fuel tank from the backflow pipe or the filling pipe and are precipitated, impurities are settled at the bottom of the tank by gravity, and methanol flows through the partition plate to enter the left side and is supplied by a pipeline. The left and right partition plates are respectively provided with a residue discharge opening at the bottom of the fuel tank, so that the fuel tank is convenient to empty when residues are discharged.
Methanol is stored in the lower part of the fuel tank in an atmospheric normal pressure liquid state mode, nitrogen is filled in the upper part of the fuel tank through a first nitrogen pipe, when the fuel discharge amount is larger than the fuel inlet amount, the liquid level is reduced, the air pressure in the fuel tank is reduced, the nitrogen is filled in the first nitrogen pipe, the normal pressure in the fuel tank is maintained, when the fuel inlet amount is larger than the fuel discharge amount, the liquid level is increased, the air pressure in the fuel tank is increased, and the nitrogen above the fuel tank is discharged through the first nitrogen pipe to maintain the normal pressure in the fuel tank. In an emergency, the negative pressure vacuum degree in the fuel tank reaches a set value, a vacuum valve in the first high-speed ventilation head is opened, and external air enters to maintain the normal pressure in the fuel tank; if the positive pressure in the fuel tank reaches a set value, the pressure valve in the first high-speed ventilation head is opened to release air and release pressure, so that the fuel tank is always in a safe pressure-bearing range. Through above mode, the lower floor of fuel jar is methanol liquid all the time, and the upper strata is nitrogen gas inertization state, and first nitrogen gas pipe and first high-speed ventilative head jointly carry out the pressure regulating and let fuel tank pressure be in normal work safety state all the time.
The upper end of the mixing tank is provided with a second nitrogen pipe, a first safety valve and a first pressure sensor; the lower side is provided with a first low-level liquid level switch; a first temperature sensor and a first high-level liquid level switch are sequentially arranged on the upper side of the first low-level liquid level switch; one side of the mixing tank is connected with a first fuel pipeline; the bottom is connected with a second fuel pipeline; the other side is connected with a third bypass pipeline. The mixing tank is a pressure container, and the working pressure is 5bar +/-0.5 bar.
The whole methanol fuel supply system is remotely controlled by a control system; comprises a first control panel and a second control panel; and the system can be controlled in regions and flexibly set.
Further, the methanol fuel supply system further comprises a water adding pipeline, and the water adding pipeline is arranged on the second fuel pipeline and used for mixing with the methanol in the second fuel pipeline in proportion and then entering the main engine for combustion.
The water adding pipeline comprises a water source, a water pump, a second flowmeter, a second proportional valve and a fourth bypass pipe. The second flowmeter is a mass flowmeter, the second proportional valve is an opening regulating valve and can regulate the flow and pressure of the water pump outlet, the fourth bypass pipe is provided with the second proportional valve which can regulate the backflow amount, the second proportional valve and the fourth bypass pipe are matched to regulate the pressure and flow of water at the water pump outlet, and the water feeding pipeline is provided with a temperature regulating device which can regulate the water temperature to 30-35 ℃.
The concrete mode is as follows: the flow of water is monitored by a second flow meter, the flow is connected to a first control disc, the second flow meter is connected to a second control disc for monitoring, the first control disc and the second control disc are mutually networked for regulation, the mass flow of the second flow meter is controlled to be 30% -40% of the mass flow of the second flow meter when the load of a host is 100%, the mass flow of the second flow meter is controlled to be 70% -80% of the mass flow of the second flow meter when the load of the host is 20% -25%, and water and methanol are mixed and then enter the host for combustion. The water and the methanol can be mixed and supplied to the main machine according to any specified proportion by controlling the corresponding pumps and valves through the first control disc and the second control disc along with the load change of the main machine.
The water adding pipeline is provided with a double-stop discharge valve which is a remote control valve and is controlled by a first control panel, when the accident occurs and the host machine is in emergency shutdown, the valves are all closed, the association between water and the second fuel pipeline is cut off, a discharge pipeline is arranged between the double-stop discharge valves and is communicated with the discharge cabinet, and the discharge pipeline is also provided with a discharge valve for controlling the medium in the discharge pipeline to be discharged into the discharge cabinet.
Further, the first fuel pipeline comprises a first filter, a first pressure pump and a first heat exchanger which are communicated in sequence; the filtering precision of a filter screen of the first filter is 20-50 um; the first pressure pump and the first heat exchanger are used for raising and boosting temperature and pressure in the first stage; the pressure boosted by the first pressure pump is 5bar +/-0.5 bar; the temperature of the first heat exchanger is increased to 10-20 ℃.
The first fuel pipeline mainly heats and boosts the fuel in the first stage, and the mixing tank is designed to buffer the methanol and eliminate the air resistance caused by the accumulation and evaporation of the fuel during transportation. The first filter is a coarse filter, and one or more filters can be designed to be connected in parallel, which is within the protection scope of the invention; when the pressure difference exceeds a set threshold value, the filter is judged to be blocked, namely the filter is switched to be used in parallel, and the blocked filter is cleaned.
Further, the first fuel line further comprises a first proportional valve arranged between the first pressure pump and the first heat exchanger for regulating the flow of methanol; and a first flow meter for calculating the flow of the methanol is arranged between the first heat exchanger and the mixing tank.
The first proportional valve can regulate the flow of methanol in the pipeline through remote control; the first flowmeter sends the detection data to the control end, and the control end is used for adjusting the size of the first proportional valve so as to realize intelligent adjustment of the flow.
Further, the second fuel pipeline comprises a second pressure pump, a second heat exchanger and a second filter which are sequentially communicated; the second pressure pump and the second heat exchanger are used for raising and boosting the temperature and the pressure in the second stage; the pressure boosted by the second pressure pump is 12bar +/-0.5 bar; the temperature of the second heat exchanger is increased to 30-40 ℃; the filter screen filter fineness of second filter is 10 ~ 20 um.
The second fuel pipeline mainly carries out second-stage temperature rise and pressure rise on the fuel, the second filter is used for fine filtration, and one or more fuel pipelines can be designed to be connected in parallel, and the temperature rise and the pressure rise are within the protection scope of the invention; and a differential pressure gauge is arranged at the inlet and the outlet of the second filter, when the differential pressure exceeds a set threshold value, the filter is judged to be blocked, namely, the parallel filters are switched to be used, and the blocked filter is cleaned.
Further, the second fuel pipeline further comprises an electric tracing arranged between the second filter and the main machine; the electric tracing is selectively started to heat the methanol before entering the main machine.
The electric tracing is started mainly in a low-temperature environment; if the temperature of the methanol in the second fuel pipeline drops to a certain threshold value in outdoor cold weather, the electric tracing heating is started, and the pipe body is heated through the tracing band wound outside the second fuel pipeline, so that the temperature of the methanol fuel in the pipe reaches the specified threshold value and then enters the engine room for the host machine to use.
Further, the methanol fuel supply system further comprises a bleed line; the discharge pipeline comprises a discharge cabinet, a first liquid inlet main pipe communicated with the discharge cabinet, a second liquid inlet main pipe communicated with the discharge cabinet and a plurality of liquid inlet branch pipes; one end of each of the liquid inlet branch pipes is connected with the first fuel pipeline, the mixing tank, the second fuel pipeline and the fuel recovery pipeline, and the other end of each of the liquid inlet branch pipes is connected with the first liquid inlet main pipe; one end of the second liquid inlet main pipe is connected with the bottom of the fuel tank; the other end is connected with the discharge cabinet.
The discharge cabinet is arranged at the lowest end of the whole methanol fuel supply system; the discharge is realized through a plurality of pipelines; the design of the pipelines can realize the discharge of the mixed liquid of methanol and water in the fuel tank, the first fuel pipeline, the mixing tank, the second fuel pipeline and the host; the device at least comprises seven liquid inlet branch pipes, wherein liquid inlets are respectively arranged at the lower sides of the first filter, the first heat exchanger, the mixing tank, the second filter and the second heat exchanger and between the second heat exchanger and electric tracing; the liquid inlet branch pipes are converged to form a first liquid inlet main pipe, and finally flow into the discharge cabinet. The fuel tank is divided into two parts, so that the bottoms of the two divided parts are provided with a discharge port. And is communicated with the discharge cabinet through a second liquid inlet header pipe. In addition, a three-way valve is arranged on the fuel recovery pipeline; the bottom is connected with a discharge cabinet.
Furthermore, the methanol fuel supply system also comprises a plurality of bypass pipeline assemblies and proportional valves arranged on the bypass pipeline assemblies; the bypass conduit assembly comprises a first bypass conduit, a second bypass conduit, and a third bypass conduit; one end of the first bypass pipeline is connected with the second fuel pipeline, and the other end of the first bypass pipeline is connected with the mixing tank; one end of the second bypass pipeline is connected with the first fuel pipeline, and the other end of the second bypass pipeline is connected with the fuel tank; one end of the third bypass pipeline is connected with the second fuel pipeline, and the other end of the third bypass pipeline is connected with the fuel tank.
If the methanol supply is over, the first pressure sensor displays overpressure, the third proportional valve is opened to adjust the opening, the methanol flows back to enter the mixing tank through the first bypass pipeline, and the first pressure sensor displays that the pressure is restored to 12bar +/-0.5 bar. If the second pressure pump is over-pressurized, the third proportional valve can be opened to adjust the opening, and the methanol enters the mixing tank through the first bypass pipeline so as to reach 12bar +/-0.5 bar displayed by the first pressure sensor.
The first pressure sensor and the first temperature sensor are used for monitoring the pressure and the temperature in the mixing tank, when the values have deviation with the set threshold value, signals are transmitted to the second control disc, and the second control disc controls the first pressure pump and the first heat exchanger to carry out corresponding adjustment so that the pressure and the temperature meet the set threshold value requirements. The opening degree of the valve between the proportional valve on the second bypass pipeline and the first pressure pump and the first heat exchanger is adjusted, and the methanol at the outlet of the first pressure pump flows back to the fuel tank 201 in proportion through the proportional valve on the second bypass pipeline, so that the pressure and the flow at the outlet of the first pressure pump can be adjusted.
The mixing tank can collect methanol liquid and evaporated gas, and has the functions of buffering and eliminating gas resistance in the pipeline, the methanol liquid is in the lower layer inside the mixing tank, and the mixture of the evaporated gas and nitrogen is in the upper layer inside the mixing tank. When the first low-level liquid level switch gives an alarm, the second control disc controls the second pressure pump to reduce the discharge capacity; when the first high-level liquid level switch gives an alarm, the second control disc controls the second pressure pump to increase the discharge capacity. The second air-blowing pipe and the first pressure sensor signal are controlled by a second control panel in a correlation mode, the internal pressure of the mixing tank is adjusted to be within a specified threshold range through air inlet and air return, and inerting blowing is carried out when maintenance is needed. When the pressure in the mixing tank exceeds the working pressure and reaches a set threshold value of the first safety valve, the first safety valve releases overpressure.
The concrete mode is as follows: when the first low-level liquid level switch gives an alarm, the second control disc controls the second pressure pump to reduce the discharge capacity, the liquid level in the mixing tank rises at the moment, the volume of upper-layer gas in the mixing tank is reduced to cause pressure rise, and the second air pipe provides exhaust gas to reduce the pressure until the first pressure sensor displays that the pressure returns to the set working range. When the first high-level liquid level switch gives an alarm, the second control disc controls the second pressure pump to increase the displacement, the liquid level in the mixing tank drops, the volume of upper-layer gas in the mixing tank increases to cause pressure drop, and the second air pipe provides air inlet supplement pressure until the first pressure sensor displays that the pressure returns to a set working range.
The invention also provides a control method of the methanol fuel supply system, which comprises the following steps:
s1: inerting of the pipeline and the host: inerting the pipelines and the main engine of the methanol fuel supply system by using inert gas;
s2: first-stage temperature rise and pressure rise: methanol is heated and pressurized in a first stage from a fuel tank and then enters a mixing tank;
s3: and (3) second-stage temperature rise and pressure rise: the methanol is heated and pressurized in the second stage from the mixing tank and then enters the main machine;
s4: judging whether the number of air changes of the host machine per hour is more than 30-45; and whether the concentration of the methanol evaporation gas in the host is lower than 18% LEL, if so, the step S5 is executed; if not, the host computer is not started;
s5: starting the main engine, loading and operating until the fuel is completely combusted;
s6: closing the main machine, and cleaning the pipeline by using inert gas;
s7: the methanol fuel supply system performs bleed-off and deaeration.
According to the invention, methanol is buffered in the mixing tank by raising the temperature and the pressure of the methanol in stages, so that methanol vapor is prevented from being accumulated to form air resistance; thereby improving the combustion efficiency of the methanol. If either one of the two conditions in the step S4 is not satisfied or both of the two conditions are not satisfied, there may be a risk of fuel leakage or a fan being damaged, and the host cannot be normally started at this time. Preferably, the ventilation frequency of the host machine per hour is 30-45 times, and the preferable ventilation frequency is more than 32 times; the frequency is too high, the power of the fan is required to be larger, and unnecessary loss can be caused; and if the exhaust conditions are not met, methanol vapor can be accumulated to form vapor lock, and the emission standard is influenced.
Further, in step S5, the program for loading operation is:
a1: after the host machine is loaded to the first load degree and operates, water with the mass flow rate of 70-80% of the methanol flow rate is quantitatively provided to enter the host machine to be mixed and combusted with methanol fuel;
a2: after the host machine is loaded to the second load degree for operation; quantitatively providing water with the mass flow rate of 30-40% of the flow rate of the methanol, and allowing the water to enter a host machine to be mixed and combusted with the methanol fuel;
the first load degree is smaller than the second load degree;
preferably: the first load degree is 20% -25%; the second load degree is 90-100%.
Specifically, the main engine is started to carry out gradient loading, a plurality of proportional valves, flow meters and pressure pumps on the pipeline are used for cooperative control, and the methanol fuel is quantitatively provided for the main engine to operate at 20% -25% load by controlling the operation of the pumps, the opening of the valves, the backflow of a bypass pipe and the monitoring feedback of the flow meters. The proportional valve, the flow meter, the bypass pipe and the pump are further controlled to be matched and controlled, and fresh water with the mass flow of 70-80% of the flow of the methanol is quantitatively provided to enter the main machine to be mixed and combusted with the methanol fuel by controlling the operation of the pump, the opening of the valve, the backflow of the bypass pipe and the monitoring feedback of the flow meter.
The methanol fuel is quantitatively provided for the main engine to run at 100% load by controlling the operation of the pressure pump, the opening of the valve, the backflow of the bypass pipe and the monitoring feedback of the flow meter, and the water with the mass flow of 30% -40% of the flow of the methanol is quantitatively provided to enter the main engine to be mixed and combusted with the methanol fuel by controlling the operation of the pump, the opening of the valve, the backflow of the bypass pipe and the monitoring feedback of the flow meter by utilizing the matching control of the proportional valve, the flow meter and the bypass pipe.
Further, in step S6, the procedure of cleaning the pipeline with the inert gas is as follows:
b1: judging the fuel of the host; if the host fuel is 100% provided by the fuel tank, go to step B2; if the host fuel is provided by both the fuel tank and the water filling line, the step B3 is executed;
b2: starting an inert gas pipeline, blowing the methanol in the pipeline into a combustion tank for gas-liquid separation;
b3: the mixed solution is discharged to the drain tank, and step B2 is performed.
After the host computer is shut down, utilize the third nitrogen gas pipe to blow off, divide into two kinds of situations: in the first case: when the main engine fuel is 100% provided by the fuel tank, the purity of the methanol in the main engine is higher; under the condition, the discharge can only reach the IMOTier2 standard, only a nitrogen and methanol liquid mixture is blown off from the first fuel pipeline, the second fuel pipeline and the main machine, and the nitrogen and methanol liquid mixture is discharged to the fuel tank for gas-liquid separation through the first fuel pipeline, the interior of the main machine, the second fuel pipeline and the fuel recovery pipeline. In the second case: when the fuel in the main machine is provided by the fuel tank and the water adding pipeline together, the main machine is a mixed solution of methanol and water, at this time, the water-added methanol is firstly discharged to the discharge cabinet, and then the step of the first condition is executed, so that the water-added methanol is prevented from directly returning to the fuel tank.
Further, in step S7, the bleeding and degassing step includes: the residual fuel and nitrogen within the pipeline and host are evacuated and vented to a blow-down tank.
Further, in step S1, the inerting time is t1 seconds, and the calculation formula of t1 is as follows:
Figure BDA0003577793850000071
wherein Q1 is the external pipeline volume of the on-way host from the gas source to the discharge port, Q2 is the internal volume to be blown off, VN2 is the nitrogen blowing speed, and n is the redundancy factor.
The inert gas is nitrogen, a nitrogen inerting pipeline and a host are utilized, and a third nitrogen pipe is arranged at the liquid inlet end of the junction of the water adding pipeline and the second fuel pipeline; nitrogen enters from the third nitrogen pipe to blow off the air in the second fuel pipeline and the main engine, the three-way valve is opened to communicate the fuel recovery pipeline, the nitrogen blow-off air is discharged from the fuel recovery pipeline to the open safety area through the opening valve, the valve of the fuel recovery pipeline communicated with the fuel tank is kept closed, and the inerting blow-off lasts for a period of time t1Second, time t1According to volume and purge rateAnd (5) calculating the degree.
Different parameters can be designed according to requirements for each parameter in the formula, and Q is taken1＝0.9m3,Q2＝0.3m3,VN2＝0.1m3S, n is 3; calculating t by substituting into formula 136 seconds. The above numerical values are exemplary, not limiting, and various numerical substitutions are possible within the scope of the present invention. The first control panel receives the time t1When the inerting is determined to be completed, the inside air is completely replaced with nitrogen gas, and the process proceeds to step S2.
Further, in step S2, the pressure after the temperature and pressure rise in the first stage is 5bar ± 0.5 bar; the temperature after the first-stage temperature rise and pressure rise is 10-20 ℃; in step S3, the pressure after the temperature and pressure rise in the second stage is 12bar ± 0.5 bar; and the temperature after the temperature and the pressure are increased in the second stage is 30-40 ℃.
In step S2, the first pressure pump is started, methanol from the fuel tank passes through the first filter, the filter screen is filtered with a filter precision of 20-50 um, the methanol is pressurized to 5bar ± 0.5bar by the first pressure pump, the methanol is heated by the first heat exchanger, the temperature of the second temperature sensor is 12-13 ℃, and the methanol enters the mixing tank. More specifically, the first heat exchanger is a plate heat exchanger adopting water glycol as a medium, the water glycol solution with the glycol concentration of 35% heats methanol to 12-13 ℃, and the filtering precision of the first filter is 25-50 um. The pressure sensor sets a normal working range to be 5bar +/-0.5 bar, the second temperature sensor sets a normal working range to be 12-13 ℃, and the second control panel is connected to carry out real-time monitoring.
In step S3, the second pressure pump is first activated, and the methanol is pressurized from the mixing tank to 12bar ± 0.5bar by the second pressure pump, and more preferably, heated to 30 ℃ to 35 ℃ by the second heat exchanger, filtered by the filter 114 (the filter screen filters impurities with a precision of 10 to 20um, and can be further heated to a specified threshold by electric tracing 210. The methanol is pressurized by a second pressure pump, 12bar +/-0.5 bar is detected by a second pressure sensor, the methanol is heated by a second heat exchanger, more preferably, the methanol continues to enter a cabin pipeline of the main engine after 30-35 ℃ is detected by a third temperature sensor, before entering a cabin double-wall pipeline, if the temperature of the methanol in the second fuel line drops to a certain threshold value in cold weather outdoors, the electric tracing will be activated, the second fuel pipeline is heated by a heat tracing band wound outside the pipeline, so that the temperature of the methanol fuel in the pipeline reaches a specified threshold value and then enters the engine room for use by the main engine.
Furthermore, the methanol fuel supply system provided by the invention is provided with a fuel supply unit pry block, and specifically, a first pressure pump, a second pressure pump, a third pressure pump on a first liquid inlet main pipe, a first fuel pipeline, a part of second fuel pipelines, a first filter, a second filter, related valves, a first heat exchanger, a second heat exchanger, a first flowmeter, a third flowmeter, a mixing tank, a pressure sensor, a temperature sensor, a second control panel and the like are intensively arranged on one pry block, so that the pry block is preassembled in advance, space is saved, and batch production, transportation, installation and control are facilitated. The second control panel can monitor and control the first pressure pump, the second pressure pump, the third pressure pump on the first liquid inlet main pipe, the first filter, the second filter, relevant valves, a flowmeter, a mixing tank, a pressure sensor, a temperature sensor and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) the methanol fuel supply system is provided with the mixing tank, can buffer the methanol fuel, and can eliminate air resistance caused by accumulation and evaporation of the fuel during transportation. Meanwhile, the invention is provided with the functions of gradient pressurization and heating processes, synchronous filtration, overpressure backflow pipelines, emergency turn-off and release of the double-stop valve group and the like, so that the whole system has more comprehensive functions and is more stable, and the safety and the stability of the operation of the system are improved.
(2) The fresh water feeding pipeline is designed, and by utilizing the characteristic that methanol and water are more sufficiently mixed and combusted, the fresh water and the methanol are mixed in proportion and then enter the main engine for combustion, so that the emission of nitrogen oxides of the main engine is favorably reduced, the IMO Tier 3 emission standard is met, and the fresh water feeding pipeline is more environment-friendly and energy-saving.
(3) The invention designs the plurality of nitrogen pipes, can provide nitrogen for each pipeline, the host, the combustion tank and the mixing tank, performs internal blowing, inerting and fuel recovery, and performs inerting pressure regulation on the fuel tank and the mixing tank, so that the system is more convenient and faster to clean, and the nitrogen is nontoxic and safer to discharge. In addition, the invention provides a discharge collection function, and residual fuel in the pipeline and the main machine is collected back to the methanol discharge cabinet through the pneumatic diaphragm pump and natural discharge.
(4) The invention designs a double-wall pipe and a fan aiming at the host, is provided with a flowmeter and a hydrocarbon gas detector, provides an explosion-proof ventilation function, provides two preposed safety conditions for the start of the host and ensures the stable operation of the host. And the methanol liquid inlet pipe and the fresh water supply pipe are both provided with double stop relief valves, and the device has the functions of closing the double stop valves and cutting off supply in an emergency state, and performs emergency relief to respectively flow back to the fuel tank and the relief cabinet.
(5) The skid block can be made into a fuel supply unit skid block, and a fuel pressure pump, a pipeline, a filter, a valve, a heat exchanger, a flowmeter, a mixing tank, a pressure sensor, a temperature sensor, a control panel and the like are arranged on one skid block in a centralized manner, so that the skid block is preassembled in advance, saves space, is convenient for batch production, transportation, installation and control, can be in joint control with an external control panel and the like, is more intelligent in control, and saves labor cost.
Drawings
FIG. 1 is a schematic diagram of the overall layout of a methanol fuel supply system according to the present invention.
Fig. 2 is a schematic diagram of another overall layout structure of the methanol fuel supply system of the present invention.
FIG. 3 is a schematic diagram of a first fuel line layout of the methanol fuel supply system of the present invention.
Fig. 4 is a schematic diagram of a second fuel line layout of the methanol fuel supply system of the present invention.
FIG. 5 is a schematic diagram of a methanol fuel supply system control method of the present invention.
Detailed Description
The technical scheme in the embodiment of the invention is described in more detail by the attached drawings in the embodiment. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
A methanol fuel supply system, as shown in fig. 1, comprises a fuel tank 1, a first fuel pipeline 2, a mixing tank 3, a second fuel pipeline 4, a main engine 5 and a fuel recovery pipeline 6 which are connected in sequence, wherein the tail end of the fuel recovery pipeline 6 is connected with the fuel tank 1; the first fuel pipeline 2 is used for carrying out first-stage temperature rise and pressure rise on the methanol in the fuel tank 1; the second fuel pipeline 4 is used for carrying out second-stage temperature rise and pressure rise on the methanol in the mixing tank 3; the fuel recovery pipeline 6 is used for recovering methanol in a pipeline to the fuel tank 1 to realize the recovery and the reuse of fuel; inert gas lines 7 for inerting the lines are also provided on the fuel tank 1, the mixing tank 3 and the second fuel line 4.
The fuel tank 1 is used for containing methanol; referring to fig. 2, the fuel tank 1 is provided with an inert gas pipeline 7, namely a first nitrogen gas pipe 71 and a first high-speed gas permeable head 101, and has two return pipe orifices 201, a filling pipe 202, a liquid outlet pipe 203 and two residue discharging ports 204, the interior of the fuel tank 1 is divided into two parts by a partition plate 11, the right side is provided with two return pipe orifices 201 and a filling pipe 202, returned and filled media respectively enter the right side of the fuel tank 1 from the return pipe orifices 201 or the filling pipe 202 and are precipitated, impurities are gravitationally settled at the bottom of the tank, and methanol overflows the partition plate 11 to enter the left side and is supplied through a pipeline. The left and right partition boards 11 are respectively provided with a residue discharge port 204 at the bottom of the fuel tank 1, so that the residue can be conveniently discharged.
The upper end of the mixing tank 3 is provided with a second nitrogen pipe 31, a first safety valve 32 and a first pressure sensor 33; a first low level liquid level switch 34 is arranged at the lower side; a first temperature sensor 35 and a first high-level liquid level switch 36 are sequentially arranged on the upper side of the first low-level liquid level switch 34; one side of the mixing tank 3 is connected with a first fuel pipeline 2; the bottom is connected with a second fuel pipe line 4; the other side is connected to a third bypass line 303. The mixing tank 3 is a pressure container, and the working pressure is 5bar +/-0.5 bar.
Referring to fig. 1 to 2, the methanol fuel supply system further includes a water adding line 8, where the water adding line 8 is disposed on the second fuel line 4, and is used for mixing with methanol in the second fuel line 4 in proportion and then entering the main engine 5 for combustion.
The water supply line 8 comprises a water source 81, a water pump 82, a second flow meter 83, a second proportional valve 84, and a fourth bypass pipe 85. The second flowmeter 83 is a mass flowmeter, the second proportional valve 84 is an opening degree regulating valve, the flow and the pressure of the outlet of the water pump 82 can be regulated, the fourth bypass pipe 85 is provided with the second proportional valve 84 which can regulate the reflux quantity, the second proportional valve 84 and the fourth bypass pipe 85 are matched with each other to regulate the pressure and the flow of the water at the outlet of the water pump 82, and the water adding pipeline 8 is provided with a temperature regulating device which can regulate the water temperature to 30-35 ℃.
The flow rate of water is monitored by the second flow meter 83, the flow rate is connected to the first control disc 10, the second flow meter 83 is connected to the second control disc 20 for monitoring, the first control disc 10 and the second control disc 20 are mutually networked for regulation, when the load of the host 5 is 100%, the mass flow rate of the second flow meter 83 is controlled to be 30% -40% of the mass flow rate of the second flow meter 83, when the load of the host 5 is 20% -25%, the mass flow rate of the second flow meter 83 is controlled to be 70% -80% of the mass flow rate of the second flow meter 83, and water and methanol are mixed and then enter the host 5 for combustion. As the load of the main machine 5 changes, the corresponding pumps and valves are controlled by the first control panel 10 and the second control panel 20, and water and methanol can be mixed and supplied to the main machine 5 according to any specified ratio.
The water adding pipeline 8 is provided with a double-stop drain valve 86 which is a remote control valve and is controlled by the first control panel 10, when the host 5 is in emergency shutdown in case of accident, the valves are all closed, the association between water and the second fuel pipeline 4 is cut off, a drain pipeline 87 is arranged between the double-stop drain valves 86 and is communicated with a drain cabinet 91, and a drain valve 88 is also arranged on the drain pipeline 87 and is used for controlling the medium in the drain pipeline 87 to be drained into the drain cabinet 91.
As shown in fig. 2 and 3, the first fuel line 2 includes a first filter 21, a first pressure pump 22, and a first heat exchanger 23, which are connected in this order; the filtering precision of the filter screen of the first filter 21 is 20-50 um; the first pressure pump 22 and the first heat exchanger 23 are used for raising and boosting temperature and pressure in the first stage; the pressure boosted by the first pressure pump 22 is 5bar +/-0.5 bar; the temperature of the first heat exchanger 23 is increased to 10-20 ℃.
As shown in fig. 3, the first fuel line 2 further includes a first proportional valve 24 provided between the first pressure pump 22 and the first heat exchanger 23 for regulating the flow rate of methanol; a first flow meter 25 for calculating the flow of methanol is further arranged between the first heat exchanger 23 and the mixing tank 3.
As shown in fig. 4, the second fuel line 4 includes a second pressure pump 41, a second heat exchanger 42, and a second filter 43, which are sequentially communicated; the second pressure pump 41 and the second heat exchanger 42 are used for raising and boosting the temperature and the pressure in the second stage; the pressure boosted by the second pressure pump 41 is 12bar +/-0.5 bar; the temperature of the second heat exchanger 42 is increased to 30-40 ℃; the filter screen filtering precision of the second filter 43 is 10-20 um.
As shown in fig. 4, the second fuel line 4 further comprises an electric tracing 44 disposed between the second filter 43 and the main frame 5; the electric tracing 44 is selectively activated to heat the methanol prior to entering the main body 5.
As shown in fig. 2, the methanol fuel supply system further includes a bleed line 9; the discharge pipeline 9 comprises a discharge cabinet 91, a first inlet main 92 communicated with the discharge cabinet 91, a second inlet main 93 communicated with the discharge cabinet 91 and a plurality of inlet branch pipes 94; one end of each of the plurality of liquid inlet branch pipes 94 is connected to the first fuel pipeline 2, the mixing tank 3, the second fuel pipeline 4 and the fuel recycling pipeline 6, and the other end is connected to the first liquid inlet main pipe 92; one end of the second inlet manifold 93 is connected with the bottom of the fuel tank 1; the other end is connected with the discharging cabinet 91.
As shown in fig. 1, the methanol fuel supply system further includes a plurality of bypass pipe assemblies and proportional valves disposed on the bypass pipe assemblies; the bypass conduit assembly comprises a first bypass conduit 301, a second bypass conduit 302, and a third bypass conduit 303; one end of the first bypass pipeline 301 is connected with the second fuel pipeline 4, and the other end of the first bypass pipeline is connected with the mixing tank 2; one end of the second bypass pipeline 302 is connected with the first fuel pipeline 2, and the other end is connected with the fuel tank 1; one end of the third bypass pipe 303 is connected to the second fuel line 4, and the other end is connected to the fuel tank 1.
As shown in fig. 1, the methanol fuel supply system of the present invention has a fuel supply unit skid 100, and specifically, the first pressure pump 22, the second pressure pump 41, the third pressure pump on the first liquid inlet manifold 92, the first fuel pipeline 2, a part of the second fuel pipeline 4, the first filter 21, the second filter 43, the relevant valves, the first heat exchanger 23, the second heat exchanger 42, the first flowmeter 25, the third flowmeter, the mixing tank 3, the pressure sensor, the temperature sensor, the second control panel 20, etc. are collectively mounted on one skid, so that the skid is preassembled in advance, saves space, and is convenient for mass production, transportation, installation and control. The second control panel 20 can monitor and control the first pressure pump 22, the second pressure pump 41, the third pressure pump on the first inlet manifold 92, the first filter 21, the second filter 43, the relevant valves, the flow meter, the mixing tank 3, the pressure sensor, the temperature sensor, and the like.
Referring to fig. 1 to 4, if the methanol supply is over, the first pressure sensor 33 displays overpressure, the third proportional valve 401 is opened to adjust the opening, the methanol flows back to the first bypass pipe 301 to enter the mixing tank 3, and the first pressure sensor 33 displays that the pressure is restored to 12bar ± 0.5 bar. If the second pressure pump 41 is over pressurized, the third proportional valve 401 can be opened to adjust the opening degree, and methanol enters the mixing tank 3 through the first bypass pipe 301, so that the first pressure sensor 33 displays 12bar +/-0.5 bar.
The first pressure sensor 33 and the first temperature sensor 35 are used for monitoring the pressure and temperature in the mixing tank 3, when the values have deviation from the set threshold value, signals are transmitted to the second control panel 20, and the second control panel 20 controls the first pressure pump 22 and the first heat exchanger 23 to be adjusted correspondingly, so that the pressure and the temperature meet the set threshold value requirements. The pressure and flow rate at the outlet of the first pressure pump 22 can be adjusted by adjusting the opening degree of the proportional valve on the second bypass pipe 302 and the valves between the first pressure pump 22 and the first heat exchanger 23, and by allowing the methanol at the outlet of the first pressure pump 22 to proportionally flow back to the fuel tank 1 through the proportional valve on the second bypass pipe 302.
When the first low level switch 34 gives an alarm, the second control panel 20 controls the second pressure pump 41 to reduce the displacement, at this time, the liquid level in the mixing tank 3 rises, the volume of upper layer gas in the mixing tank 3 becomes small, so that the pressure rises, and the second air pipe 31 provides exhaust gas to reduce the pressure until the first pressure sensor 33 displays that the pressure returns to the set working range. When the first high level liquid level switch 36 gives an alarm, the second control panel 20 controls the second pressure pump 41 to increase the displacement, at this time, the liquid level in the mixing tank 3 decreases, the volume of upper layer gas in the mixing tank 3 increases to cause the pressure to decrease, and the second air pipe 31 provides the air inlet supplement pressure until the pressure displayed by the first pressure sensor 33 returns to the set working range.
Example 2
The present embodiment provides a control method of a methanol fuel supply system.
The invention also provides a control method of the methanol fuel supply system, which comprises the following steps:
s1: inerting of the pipe and the host 5: inerting the piping and the main unit 5 of the methanol fuel supply system with an inert gas;
s2: first-stage temperature rise and pressure rise: methanol is heated and pressurized in a first stage from a fuel tank 1 and then enters a mixing tank 3;
s3: and (3) second-stage temperature rise and pressure rise: the methanol is heated and pressurized in the second stage from the mixing tank 3 and then enters the main machine 5;
s4: judging whether the number of air changes of the host 5 per hour is more than 32; and whether the concentration of the methanol vapor in the main unit 5 is lower than 18% LEL, if so, the process goes to step S5; if not, the host computer is not started;
s5: starting the main engine 5, loading and running until the fuel is completely combusted; (ii) a
S6: closing the main machine 5, and cleaning the pipeline by using inert gas;
s7: the methanol fuel supply system performs bleed-off and deaeration.
In step S1, the inerting time is t1 seconds, and the calculation formula of t1 is:
Figure BDA0003577793850000121
wherein Q1 is the external pipe volume of main engine 5 along the way from the gas source to the discharge port, Q2 is the internal volume of main engine 5 to be blown off, VN2 is the nitrogen blowing speed, and n is the redundancy factor.
The inert gas is nitrogen, a nitrogen inerting pipeline and the host 5 are utilized, and a third nitrogen pipe is arranged at the liquid inlet end of the junction of the water adding pipeline 8 and the second fuel pipeline 4; nitrogen enters from a third nitrogen pipe, blows off air in the second fuel pipeline 4 and the main machine 5, the three-way valve is opened to communicate the fuel recovery pipeline 6, the nitrogen blows off the air to be discharged to an open safety area from the fuel recovery pipeline 6 through an open valve, the valve of the fuel recovery pipeline 6 communicated with the fuel tank 1 is kept closed, and the inerting blowing lasts for a period of time t1Second, time t1Calculated from the volume and purge rate.
Different parameters can be designed according to requirements for each parameter in the formula, and Q is taken1＝0.9m3,Q2＝0.3m3,VN2＝0.1m3S, n is 3; calculating t by substituting into formula 136 seconds. The above numerical values are exemplary, not restrictive, and various substitutions of numerical values are possible within the scope of the present invention. The first control disk 10 receives the time t1When the inerting is determined to be completed, the inside air is completely replaced with nitrogen gas, and the process proceeds to step S2.
In the step S2, the pressure after the temperature and pressure rise in the first stage is 5bar ± 0.5 bar; the temperature after the temperature rise and the pressure rise in the first stage is 10-20 ℃; in step S3, the pressure after the temperature and pressure rise in the second stage is 12bar ± 0.5 bar; and the temperature after the temperature and the pressure rise in the second stage is 30-40 ℃.
In the step S2, the first pressure pump 22 is started, and the methanol is filtered by the first filter 21 from the fuel tank 1 with the filter screen having a filtering precision of 20 to 50um, pressurized to 5bar ± 0.5bar by the first pressure pump 22, heated by the first heat exchanger 23, and then enters the mixing tank 3 with the second temperature sensor displaying 12 to 13 ℃. More specifically, the first heat exchanger 23 is a plate heat exchanger using water glycol as a medium, the water glycol solution with the glycol concentration of 35% heats methanol to 12-13 ℃, and the filtering precision of the first filter 21 is 25-50 um. The normal working range of the pressure sensor is set to be 5bar +/-0.5 bar, the normal working range of the second temperature sensor is set to be 12-13 ℃, and the second control panel 20 is connected for real-time monitoring.
In the step S3, the second pressure pump 41 is first activated, the methanol is pressurized from the mixing tank 3 to 12bar ± 0.5bar by the second pressure pump 41, and more preferably, heated to 30 ℃ to 35 ℃ by the second heat exchanger 42, filtered by the filter 114 (with filter screen filtering precision of 10-20um) to remove impurities, and further heated to a designated threshold by the electric tracing 44210. The method specifically comprises the following steps: the methanol is pressurized by the second pressure pump 41, 12bar + -0.5 bar is detected by the second pressure sensor, and is warmed by the second heat exchanger 42, more preferably, 30 deg.C-35 deg.C is detected by the third temperature sensor, and then continuously advances into the cabin pipeline of the main machine 5. Before entering the double-wall pipe of the engine room, if the temperature of the methanol in the second fuel pipe line 4 drops to a certain threshold value in outdoor cold weather, the electric tracing heat 44 is started, the second fuel pipe line 4 is heated by the tracing band wound outside the pipe, so that the temperature of the methanol fuel in the pipe reaches the specified threshold value and then enters the engine room for the main engine 5 to use.
Further, in step S4, as shown in fig. 4, the second fuel line 4 and the fuel recovery line 6 are in the form of double-walled pipes and are communicated with each other in the cabin interior area and the main machine interior, the double-walled pipe has an outlet, an inlet, a fan 51, a flow rate detector 52, and a hydrocarbon gas detector 53, the fan 51 is controlled to be turned on by the first control board 20 to ventilate the double-walled pipe interlayer space, the flow rate monitor 52 is mounted on the inlet pipe 55, the ventilation air volume is controlled and detected by the first control board 20, and the threshold is set such that the air volume can be ventilated more than 32 times per hour. The hydrocarbon gas detector 53 is arranged on the outlet pipe 54 before the fan 51, and is controlled and detected by the first control disc 20, and the threshold value is set to be that the concentration of the methanol evaporation gas is lower than 18% LEL. When the first control panel 20 detects that both conditions are satisfied, the next step S5 is performed.
Further, in step S5, the program for loading operation is:
a1: after the host 5 is loaded to the first load degree and operates, water with the mass flow rate of 70-80% of the methanol flow rate is quantitatively provided to enter the host 5 to be mixed with the methanol fuel for combustion;
a2: after the host 5 is loaded to the second load degree for operation; quantitatively providing water with the mass flow of 30-40% of the flow of the methanol, and enabling the water to enter a host 5 to be mixed and combusted with the methanol fuel;
the first load degree is smaller than the second load degree;
or in step S5, the program for loading operation is: a host 5.
Preferably: the first load degree is 20% -25%; the second load degree is 90-100%.
Specifically, the main engine 5 is started to carry out gradient loading, a plurality of proportional valves, flow meters and pressure pumps on the pipeline are used for matching control, and the methanol fuel is quantitatively provided for the main engine 5 to operate at 20% -25% load by controlling the operation of the pumps, the opening of the valves, the backflow of a bypass pipe and the monitoring feedback of the flow meters. The proportional valve, the flow meter, the bypass pipe and the pump are further controlled to be matched and controlled, and fresh water with the mass flow of 70-80% of the flow of the methanol is quantitatively provided to enter the main machine 5 to be mixed and combusted with the methanol fuel by controlling the operation of the pump, the opening degree of the valve, the backflow of the bypass pipe and the monitoring feedback of the flow meter.
The methanol fuel is quantitatively provided for the main engine 5 to operate at 100% load by controlling the operation of the pressure pump, the opening of the valve, the backflow of the bypass pipe and the monitoring feedback of the flow meter, and the water with the mass flow of 30% -40% of the flow of the methanol is quantitatively provided to enter the main engine 5 to be mixed and combusted with the methanol fuel by controlling the operation of the pump, the opening of the valve, the backflow of the bypass pipe and the monitoring feedback of the flow meter by utilizing the matching control of the proportional valve, the flow meter and the bypass pipe.
Further, in step S6, the procedure of cleaning the pipeline with the inert gas is as follows:
b1: judging the fuel of the host 5; if the fuel of the host 5 is 100% provided by the fuel tank 1, the step B2 is entered; if the host 5 fuel is provided by both the water line and the fuel line, i.e. the mixed solution of methanol and water, the process proceeds to step B3;
b2: starting an inert gas pipeline 7, blowing the methanol in the pipeline into a combustion tank for gas-liquid separation;
b3: the mixed solution is discharged to the drain tank 91, and step B2 is performed again.
After the host 5 stops, the third nitrogen pipe is utilized to blow off, and the two conditions are divided into: in the first case: when 100% of fuel of the main machine 5 is provided by the fuel tank 1, the discharge can only reach the IMOTier2 standard under the condition, only a nitrogen and methanol liquid mixture in the first fuel pipeline 2, the second fuel pipeline 4 and the main machine 5 is blown off, and the nitrogen and methanol liquid mixture is discharged to the fuel tank 1 for gas-liquid separation through the first fuel pipeline 2, the inside of the main machine 5, the second fuel pipeline 4 and the fuel recovery pipeline 6. In the second case: when the main unit 5 is powered by the water filling line and the fuel line, and the main unit is shut down, the first fuel line 2, the second fuel line 4 and the main unit 5 are a mixture of methanol and water, the water-mixed methanol is discharged to the discharge tank 91, and then the first step is performed to prevent the water-mixed methanol from directly returning to the fuel tank 1.
Further, in step S7, the bleeding and degassing step includes: the residual fuel and nitrogen within the pipeline and host 5 are evacuated and vented to a blow down tank 91.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention. Those skilled in the art can also make other changes and the like in the design of the present invention within the spirit of the present invention as long as they do not depart from the technical effects of the present invention. Such variations are intended to be included within the scope of the invention as claimed.

Claims (10)

1. A methanol fuel supply system is characterized by comprising a fuel tank (1), a first fuel pipeline (2), a mixing tank (3), a second fuel pipeline (4), a main machine (5) and a fuel recovery pipeline (6) which are connected in sequence, wherein the tail end of the fuel recovery pipeline (6) is connected with the fuel tank (1);
the first fuel pipeline (2) is used for carrying out first-stage temperature rise and pressure rise on the methanol in the fuel tank (1);
the second fuel pipeline (4) is used for carrying out second-stage temperature rise and pressure rise on the methanol in the mixing tank (3);
the fuel recovery pipeline (6) is used for recovering methanol in the pipeline to the fuel tank (1) to realize the recovery and the reuse of fuel;
an inert gas pipeline (7) for inerting the pipeline is further arranged on the fuel tank (1), the mixing tank (3) and the second fuel pipeline (4);
the methanol fuel supply system further comprises a water adding pipeline (8), wherein the water adding pipeline (8) is arranged on the second fuel pipeline (4) and used for mixing with methanol in the second fuel pipeline (4) in proportion and then entering the main engine (5) for combustion.
2. A methanol fuel feeding system according to claim 1, characterized in that the first fuel line (2) comprises a first filter (21), a first pressure pump (22), a first heat exchanger (23) in communication in sequence;
the filtering precision of the filter screen of the first filter (21) is 20-50 um;
the first pressure pump (22) and the first heat exchanger (23) are used for the first stage temperature rise and pressure rise; the pressure boosted by the first pressure pump (22) is 5-8 bar; the temperature of the first heat exchanger (23) is increased to 10-20 ℃;
the first fuel line (2) further comprises a first proportional valve (24) arranged between the first pressure pump (22) and the first heat exchanger (23) for regulating the flow of methanol; a first flow meter (25) used for calculating the flow of the methanol is arranged between the first heat exchanger (23) and the mixing tank (3);
the second fuel pipeline (4) comprises a second pressure pump (41), a second heat exchanger (42) and a second filter (43) which are communicated in sequence;
the second pressure pump (41) and the second heat exchanger (42) are used for raising and boosting the temperature and the pressure in the second stage; the pressure boosted by the second pressure pump (41) is 10-13 bar; the temperature of the second heat exchanger (42) is increased to 30-40 ℃;
the filtering precision of the filter screen of the second filter (43) is 10-20 um;
the second fuel line (4) further comprises an electric tracing (44) provided between the second filter (43) and the main machine (5); the electric tracing (44) is selectively activated to heat the methanol before entering the main body (5).
3. A methanol fuel supply system according to claim 1, characterized in that it further comprises a bleed line (9); the discharge pipeline (9) comprises a discharge cabinet (91), a first inlet main pipe (92) communicated with the discharge cabinet (91), a second inlet main pipe (93) communicated with the discharge cabinet (91) and a plurality of inlet branch pipes (94);
one end of each of the liquid inlet branch pipes (94) is connected with the first fuel pipeline (2), the mixing tank (3), the second fuel pipeline (4) and the fuel recovery pipeline (6), and the other end of each of the liquid inlet branch pipes is connected with the first liquid inlet main pipe (92);
one end of the second liquid inlet header pipe (93) is connected with the bottom of the fuel tank (1); the other end is connected with a discharge cabinet (91).
4. The methanol fuel supply system of claim 1, further comprising a plurality of bypass conduit assemblies and a proportional valve disposed on the bypass conduit assemblies; the bypass duct assembly comprises a first bypass duct (301), a second bypass duct (302) and a third bypass duct (303);
one end of the first bypass pipeline (301) is connected with the second fuel pipeline (4), and the other end of the first bypass pipeline is connected with the mixing tank (2);
one end of the second bypass pipeline (302) is connected with the first fuel pipeline (2), and the other end of the second bypass pipeline is connected with the fuel tank (1);
one end of the third bypass pipeline (303) is connected with the second fuel pipeline (4), and the other end is connected with the fuel tank (1).
5. A control method of a methanol fuel supply system, characterized by comprising the steps of:
s1: inerting of the pipeline and the main engine (5): inerting the lines and the main unit (5) of the methanol fuel supply system with an inert gas;
s2: first-stage temperature rise and pressure rise: methanol is heated and pressurized in a first stage from a fuel tank (1) and then enters a mixing tank (3);
s3: and (3) second-stage temperature rise and pressure rise: the methanol is heated and pressurized in the second stage from the mixing tank (3) and then enters the main machine (5);
s4: judging whether the ventilation frequency of the host (5) per hour is more than 30-45 times; and whether the concentration of the methanol evaporation gas in the host (5) is lower than 18% LEL, if so, the step S5 is executed; if not, the host (5) is not started;
s5: starting a main engine (5), loading and operating, and continuously supplying fuel;
s6: closing the main machine (5), and cleaning the pipeline by using inert gas;
s7: the methanol fuel supply system performs bleed-off and deaeration.
6. The control method according to claim 5, wherein in the step S5, the program for loading operation is: the load degree of the host (5) gradually rises from zero; the proportion of the flow of the water entering the main machine to the flow of the methanol is gradually reduced from 90 percent.
7. The control method according to claim 6, wherein in the step S5, the program for loading operation is: (ii) a
A1: after the host (5) is loaded to the first load degree and operates, water with the mass flow rate of 70-80% of the methanol flow rate is quantitatively provided to enter the host (5) to be mixed and combusted with methanol fuel;
a2: after the host (5) is loaded to the second load degree for operation; quantitatively providing water with the mass flow of 30-40% of the flow of the methanol, and enabling the water to enter a host (5) to be mixed and combusted with the methanol fuel;
the first load degree is smaller than the second load degree; the second load factor is 100% or less.
8. The control method according to claim 7, wherein the first load factor is 20% to 25%; the second load degree is 90-100%.
9. The control method according to claim 7, wherein in the step S6, the procedure for cleaning the pipeline with the inert gas is as follows:
b1: judging fuel of the host (5); if the fuel of the host (5) is 100% supplied by the fuel tank (1), the step B2 is carried out; if the fuel of the main engine (5) is supplied by the fuel tank (1) and the water adding pipeline (8), the step B3 is executed;
b2: starting an inert gas pipeline (7), and blowing the methanol in the pipeline into a combustion tank for gas-liquid separation;
b3: discharging the mixed solution into a discharge cabinet (91), and then performing step B2;
in step S7, the bleeding and degassing step includes: the residual fuel and nitrogen in the piping and main unit (5) are evacuated and discharged into a dump cabinet (91).
10. The control method according to claim 8, wherein in step S1, the inerting time is t1Second, t1The calculation formula is as follows:
Figure FDA0003577793840000031
in the formula Q1External pipe volume of main body (5) along way from gas source to discharge port, Q2The volume V required to be blown off inside the main machine (5)N2The nitrogen purging speed is adopted, and n is a redundancy multiple;
the pressure after the temperature and pressure rise in the first stage is 5bar +/-0.5 bar; the temperature after the temperature rise and the pressure rise in the first stage is 10-20 ℃; in step S3, the pressure after the temperature and pressure rise in the second stage is 12bar ± 0.5 bar; and the temperature after the temperature and the pressure rise in the second stage is 30-40 ℃.
CN202210348019.XA 2022-04-01 2022-04-01 Methanol fuel supply system and control method thereof Active CN114635815B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210348019.XA CN114635815B (en) 2022-04-01 2022-04-01 Methanol fuel supply system and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210348019.XA CN114635815B (en) 2022-04-01 2022-04-01 Methanol fuel supply system and control method thereof

Publications (2)

Publication Number Publication Date
CN114635815A true CN114635815A (en) 2022-06-17
CN114635815B CN114635815B (en) 2023-04-28

Family

ID=81951336

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210348019.XA Active CN114635815B (en) 2022-04-01 2022-04-01 Methanol fuel supply system and control method thereof

Country Status (1)

Country Link
CN (1) CN114635815B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116335859A (en) * 2023-05-23 2023-06-27 潍柴动力股份有限公司 Engine fuel supply system and control method

Citations (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2113528A1 (en) * 1970-03-25 1971-10-14 Marathon Oil Co Process for pelletizing carbon particles coated with oil
US4876989A (en) * 1988-05-10 1989-10-31 Technology Development Associates, Inc. Enhanced performance of alcohol fueled engine during cold conditions
US5245953A (en) * 1991-07-31 1993-09-21 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Emulsion fuel engine
JPH06241132A (en) * 1993-02-19 1994-08-30 Aqueous Res:Kk Hydrogen addition system and method for operating same
US5873916A (en) * 1998-02-17 1999-02-23 Caterpillar Inc. Fuel emulsion blending system
JP2001229954A (en) * 2000-02-17 2001-08-24 Denso Corp Fuel-cell system
CA2433760A1 (en) * 2001-01-09 2002-07-18 Questair Technologies Inc. Fuel cell power plant with energy recovery from fuel storage
US20020098394A1 (en) * 2000-10-27 2002-07-25 Keefer Bowie G. Systems and processes for providing hydrogen to fuel cells
JP2002208422A (en) * 2001-01-09 2002-07-26 Denso Corp Fuel cell system
TWI222766B (en) * 2001-01-15 2004-10-21 Casio Computer Co Ltd Power supply system and electronical mechanism
CN1628226A (en) * 2002-02-08 2005-06-15 关口株式会社 Method of incinerating waste liquid utilizing industrial combustion equipment, and mixed liquid
JP2007046538A (en) * 2005-08-10 2007-02-22 Honda Motor Co Ltd Compression ignition internal combustion engine and its control method
CN201184254Y (en) * 2007-09-11 2009-01-21 张虓 Alcoholization gasoline generator for gasoline internal combustion engine
JP2009062893A (en) * 2007-09-06 2009-03-26 Honda Motor Co Ltd Gasoline-ethanol separator
WO2010058749A1 (en) * 2008-11-18 2010-05-27 東京瓦斯株式会社 Mcfc power generation system and method for operating same
CN102713243A (en) * 2009-08-27 2012-10-03 麦卡利斯特技术有限责任公司 Integrated fuel injectors and igniters and associated methods of use and manufacture
EP2615279A1 (en) * 2010-11-17 2013-07-17 Toyota Jidosha Kabushiki Kaisha Control device for internal combustion engine
CN103415599A (en) * 2010-11-25 2013-11-27 甘恩能源有限公司 Fuel and process for powering a compression ignition engine
CN103670841A (en) * 2013-12-18 2014-03-26 武汉中醇化汽车新能源有限公司 Back-pressure-type alcohol fuel conveying system and conveying method
CN103906641A (en) * 2011-09-19 2014-07-02 北方科技国际公司 Fuel performance booster
WO2015058241A1 (en) * 2013-10-21 2015-04-30 Gane Energy & Resources Pty Ltd Engine operation for viscosity control
JP2015221645A (en) * 2014-05-23 2015-12-10 三井造船株式会社 Ship using methanol as fuel
CN106884709A (en) * 2011-04-11 2017-06-23 秘方能源私人有限公司 Use the method for the internal combustion engine and operation internal combustion engine of hydrocarbon fuel
JP2017207062A (en) * 2016-05-02 2017-11-24 マン ディーゼル アンド ターボ フィリアル エーエフ マン ディーゼル アンド ターボ エスイー ティスクランド Two-stroke cross-head type internal combustion engine, and method for directly injecting fuel and water to combustion chamber
WO2018086891A1 (en) * 2016-11-10 2018-05-17 Continental Automotive Gmbh Method and device for controlling the oil temperature in an internal combustion engine
JP2019132221A (en) * 2018-02-01 2019-08-08 株式会社三井Ｅ＆Ｓマシナリー Fuel injection device for internal combustion engine using low ignitability fuel
US20210040884A1 (en) * 2018-03-20 2021-02-11 Fuelsave Gmbh Ship drive system and retrofitting method for a ship drive system
CN113047996A (en) * 2021-03-31 2021-06-29 广船国际有限公司 Methanol fuel dual-fuel supply system
CN113090417A (en) * 2021-03-29 2021-07-09 招商局重工(深圳)有限公司 LPG gas-liquid separation jar and fuel control system
CN113277055A (en) * 2021-06-29 2021-08-20 广船国际有限公司 Fuel mixing system for ship
CN113291412A (en) * 2021-06-29 2021-08-24 广船国际有限公司 Nitrogen system for ship and ship
CN113795663A (en) * 2019-05-29 2021-12-14 宝马股份公司 Method for determining air quality and water direct injection system
CN114017228A (en) * 2021-11-02 2022-02-08 招商局重工(深圳)有限公司 Double-inerting pipeline system of host
CN114109659A (en) * 2021-11-26 2022-03-01 招商局重工(深圳)有限公司 LPG fuel pipeline control method

Patent Citations (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2113528A1 (en) * 1970-03-25 1971-10-14 Marathon Oil Co Process for pelletizing carbon particles coated with oil
US4876989A (en) * 1988-05-10 1989-10-31 Technology Development Associates, Inc. Enhanced performance of alcohol fueled engine during cold conditions
US5245953A (en) * 1991-07-31 1993-09-21 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Emulsion fuel engine
JPH06241132A (en) * 1993-02-19 1994-08-30 Aqueous Res:Kk Hydrogen addition system and method for operating same
US5873916A (en) * 1998-02-17 1999-02-23 Caterpillar Inc. Fuel emulsion blending system
JP2001229954A (en) * 2000-02-17 2001-08-24 Denso Corp Fuel-cell system
US20020098394A1 (en) * 2000-10-27 2002-07-25 Keefer Bowie G. Systems and processes for providing hydrogen to fuel cells
JP2002208422A (en) * 2001-01-09 2002-07-26 Denso Corp Fuel cell system
CA2433760A1 (en) * 2001-01-09 2002-07-18 Questair Technologies Inc. Fuel cell power plant with energy recovery from fuel storage
TWI222766B (en) * 2001-01-15 2004-10-21 Casio Computer Co Ltd Power supply system and electronical mechanism
CN1628226A (en) * 2002-02-08 2005-06-15 关口株式会社 Method of incinerating waste liquid utilizing industrial combustion equipment, and mixed liquid
JP2007046538A (en) * 2005-08-10 2007-02-22 Honda Motor Co Ltd Compression ignition internal combustion engine and its control method
JP2009062893A (en) * 2007-09-06 2009-03-26 Honda Motor Co Ltd Gasoline-ethanol separator
CN201184254Y (en) * 2007-09-11 2009-01-21 张虓 Alcoholization gasoline generator for gasoline internal combustion engine
WO2010058749A1 (en) * 2008-11-18 2010-05-27 東京瓦斯株式会社 Mcfc power generation system and method for operating same
CN102713243A (en) * 2009-08-27 2012-10-03 麦卡利斯特技术有限责任公司 Integrated fuel injectors and igniters and associated methods of use and manufacture
EP2615279A1 (en) * 2010-11-17 2013-07-17 Toyota Jidosha Kabushiki Kaisha Control device for internal combustion engine
CN103415599A (en) * 2010-11-25 2013-11-27 甘恩能源有限公司 Fuel and process for powering a compression ignition engine
CN106884709A (en) * 2011-04-11 2017-06-23 秘方能源私人有限公司 Use the method for the internal combustion engine and operation internal combustion engine of hydrocarbon fuel
CN103906641A (en) * 2011-09-19 2014-07-02 北方科技国际公司 Fuel performance booster
WO2015058241A1 (en) * 2013-10-21 2015-04-30 Gane Energy & Resources Pty Ltd Engine operation for viscosity control
CN103670841A (en) * 2013-12-18 2014-03-26 武汉中醇化汽车新能源有限公司 Back-pressure-type alcohol fuel conveying system and conveying method
JP2015221645A (en) * 2014-05-23 2015-12-10 三井造船株式会社 Ship using methanol as fuel
JP2017207062A (en) * 2016-05-02 2017-11-24 マン ディーゼル アンド ターボ フィリアル エーエフ マン ディーゼル アンド ターボ エスイー ティスクランド Two-stroke cross-head type internal combustion engine, and method for directly injecting fuel and water to combustion chamber
WO2018086891A1 (en) * 2016-11-10 2018-05-17 Continental Automotive Gmbh Method and device for controlling the oil temperature in an internal combustion engine
JP2019132221A (en) * 2018-02-01 2019-08-08 株式会社三井Ｅ＆Ｓマシナリー Fuel injection device for internal combustion engine using low ignitability fuel
US20210040884A1 (en) * 2018-03-20 2021-02-11 Fuelsave Gmbh Ship drive system and retrofitting method for a ship drive system
CN113795663A (en) * 2019-05-29 2021-12-14 宝马股份公司 Method for determining air quality and water direct injection system
CN113090417A (en) * 2021-03-29 2021-07-09 招商局重工(深圳)有限公司 LPG gas-liquid separation jar and fuel control system
CN113047996A (en) * 2021-03-31 2021-06-29 广船国际有限公司 Methanol fuel dual-fuel supply system
CN113277055A (en) * 2021-06-29 2021-08-20 广船国际有限公司 Fuel mixing system for ship
CN113291412A (en) * 2021-06-29 2021-08-24 广船国际有限公司 Nitrogen system for ship and ship
CN114017228A (en) * 2021-11-02 2022-02-08 招商局重工(深圳)有限公司 Double-inerting pipeline system of host
CN114109659A (en) * 2021-11-26 2022-03-01 招商局重工(深圳)有限公司 LPG fuel pipeline control method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王银山等: "柴油/含水甲醇组合燃烧对柴油机性能的影响", 《天津大学学报》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116335859A (en) * 2023-05-23 2023-06-27 潍柴动力股份有限公司 Engine fuel supply system and control method
CN116335859B (en) * 2023-05-23 2023-09-15 潍柴动力股份有限公司 Engine fuel supply system and control method

Also Published As

Publication number Publication date
CN114635815B (en) 2023-04-28

Similar Documents

Publication Publication Date Title
WO2022143287A1 (en) Marine liquid ammonia fuel supply and fuel recycling system
CN105080278B (en) Oil-gas recovery method
CN106039915B (en) Device for recovering oil and gas and its recovery method
US20110256042A1 (en) Fuel system and method
US20040112220A1 (en) Low power nitrogen enriched air generation system
CN114320686B (en) Marine methanol fuel supply method
US20050056661A1 (en) Method and system for distributing hydrogen
CN102588740B (en) High-pressure and high-purity nitrogen distribution device for plume test platform and application method for device
CN101746508A (en) Decompressing fuel-oil floor washing device and method
CN216429806U (en) Methanol fuel supply system for ship
CN114635815A (en) Methanol fuel supply system and control method thereof
CN214533292U (en) Marine liquid ammonia fuel supply and fuel recycle system
CN113047996A (en) Methanol fuel dual-fuel supply system
CN101767652B (en) Fuel washing device for aircraft refueling vehicle
CN204865443U (en) Exhaust gas treating device
WO2023231501A1 (en) Hydrogen production, hydrogen storage, and hydrogenation integrated equipment
CN218130988U (en) Oil gas recovery device
CN212941534U (en) Respiratory tail gas recovery device of normal-pressure stable light hydrocarbon vertical storage tank
CN114889796A (en) Inerting control system and method for fuel pipeline
CN220890362U (en) Fuel supply system of marine diesel engine
US20140305539A1 (en) Method of draining a fluid tank in a fluid separation system
CN213513196U (en) Oil tank gas recovery system
CN117072357A (en) Marine methanol fuel supply system and control method thereof
CN220811856U (en) Remote fuel oil transmission filling device
CN219879490U (en) Oil gas recovery device of glass oil tank

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant