A large container ship methanol fuel tank tanker inerting system

Abstract

The invention discloses an inerting system for a large container ship methanol fuel tank tanker, comprising a filling module, a return air module and a recovery module, wherein the filling module comprises a first liquid phase pipe and a second liquid phase pipe, the first liquid phase pipe and the second liquid phase pipe merge into a liquid phase main pipe, the liquid phase main pipe is respectively connected to three methanol storage tanks, the first and second liquid phase pipes are respectively provided with a first transfer pump and a second transfer pump, the return air module comprises a first gas phase pipe and a second gas phase pipe, the first and second gas phase pipes merge into a gas phase main pipe, the gas phase main pipe is respectively connected to three methanol storage tanks, the recovery module comprises a recovery pipeline and a recovery water tank, the recovery pipeline outlet end is connected to the recovery water tank, and the recovery pipeline is connected to the first liquid phase pipe, the second liquid phase pipe and the gas phase main pipe. Using the system, there is no risk of methanol leakage after the methanol storage tank is inerted, thereby improving the efficiency of the inerting treatment.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to an inerting system for a methanol fuel tank truck of a large container ship. Background Art

[0002] Methanol is a transparent, water-soluble, biodegradable liquid fuel. Compared with other alternative fuels such as LNG, methanol has the key advantage of being easy to handle. Among them, green methanol has the huge advantage of being close to net zero carbon emissions. As a low-flashpoint fuel that is liquid at room temperature and pressure, methanol storage tanks need to be inerted and filled before the first filling of methanol fuel or before tank cleaning. The existing inerting and filling system for methanol storage tanks has the problem that the mixed gas of nitrogen and methanol discharged after inerting cannot be handled separately, which poses a safety hazard of methanol leakage. At the same time, the efficiency of inerting and filling is low, and it cannot meet the independent inerting and filling operations of multiple compartments.

[0003] Therefore, it is necessary to provide a large container ship methanol fuel tank tanker inerting system to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide an inerting system for a large container ship methanol fuel tank truck in view of the deficiencies in the prior art. After the methanol storage tank is inerted, there is no risk of methanol leakage, thereby improving the efficiency of the inerting treatment.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A large container ship methanol fuel tank tank truck inerting system comprises a filling module, a return air module and a recovery module, the filling module comprises a first liquid phase pipe and a second liquid phase pipe, the first liquid phase pipe and the second liquid phase pipe merge into a liquid phase main pipe, the liquid phase main pipe is respectively connected to three methanol storage tanks, the first and second liquid phase pipe inlets are both provided with quick connectors adapted to the tank truck unloading hose, the first and second liquid phase pipes are respectively provided with a first transfer pump and a second transfer pump, a first connecting pipe is provided between the liquid phase pipes at the front ends of the two transfer pump suction ports, a first connecting pipe is provided on the first connecting pipe, a second connecting pipe is provided between the liquid phase pipes at the rear ends of the two transfer pump outlets, a second connecting pipe is provided with a second connecting valve, a first connecting pipe at the rear end of the second connecting pipe is provided A first stop valve is provided on the liquid phase pipe, and a second stop valve is provided on the second liquid phase pipe at the rear end of the second connecting pipe. The return air module includes a first gas phase pipe and a second gas phase pipe. The first and second gas phase pipes merge into a gas phase main pipe, and the gas phase main pipe is respectively connected to three methanol storage tanks. The recovery module includes a recovery pipeline and a recovery water tank. The outlet end of the recovery pipeline is connected to the recovery water tank. The recovery pipeline and the first liquid phase pipe are connected between the outlet of the first transfer pump and the second connecting pipe. The recovery pipeline and the second liquid phase pipe are connected between the outlet of the second transfer pump and the second connecting pipe. The recovery pipeline is connected to the gas phase main pipe. The first and second transfer pumps are variable frequency controlled gear delivery pumps. The flow rates of the first and second transfer pumps are both 100-200m 3 / H.

[0007] Preferably, the connecting ends of the liquid phase main pipe and the gas phase main pipe with the three methanol storage tanks are both provided with remote control valves, the liquid phase main pipe extends to the bottom of each methanol storage tank, and the gas phase main pipe extends to the top of each methanol storage tank.

[0008] Preferably, the three methanol storage tanks have a total capacity of 11000m 3 .

[0009] Preferably, the volume of the recovery water tank is 200L, and a ventilation pipe is provided on the top of the recovery water tank.

[0010] Preferably, a first safety valve is provided between the recovery pipeline and the first liquid phase pipe, a second safety valve is provided between the recovery pipeline and the second liquid phase pipe, and a bypass valve is provided between the recovery pipeline and the gas phase main pipe.

[0011] A method for using an inerting system for a methanol fuel tank truck of a large container ship comprises the following steps:

[0012] Step 1: Connect the unloading hoses of the two tank trucks to the quick connectors of the first and second liquid phase pipes respectively;

[0013] Step 2: According to the internal conditions of the three methanol storage tanks, identify the methanol storage tanks that need to be inerted, open the remote control valves at the connecting ends of the corresponding methanol storage tanks and the liquid phase main pipe and the gas phase main pipe, open the bypass valve between the recovery pipeline and the gas phase main pipe, start the first and second transfer pumps, and perform inerting treatment on the methanol storage tanks. The methanol vapor and nitrogen remaining in the methanol storage tanks are discharged into the recovery water tank through the gas phase main pipe;

[0014] Step 3: When the two tank trucks are fully loaded with liquid nitrogen, adjust the operating power of the first and second transfer pumps to the maximum, i.e. 200m 3 / H, when the remaining liquid nitrogen capacity in the tank truck decreases, the operating power of the first and second transfer pumps is gradually reduced according to the remaining liquid nitrogen capacity;

[0015] Step 4: After the inerting treatment is completed, disconnect the unloading hose from the first and second liquid phase pipes, close the first stop valve and the second stop valve, open the first safety valve and the second safety valve, and use the first and second transfer pumps to recover the liquid nitrogen remaining in the first and second liquid phase pipes and transfer them to the recovery water tank;

[0016] Step 5: Stop the first and second transfer pumps, close the first and second safety valves and bypass valve. At this time, methanol vapor dissolves in the water in the recovery water tank. Open the air vent of the recovery water tank to release the nitrogen in the recovery water tank.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This system adopts a dual-pump dual-liquid phase pipe structure, which not only speeds up the efficiency of liquid nitrogen filling, but also provides double protection for the entire inerting system to prevent one of the transfer pumps from failing, which would make the inerting treatment operation impossible.

[0019] 2. A dual recovery system is used, which can recover the mixed gas of nitrogen and methanol to the recovery water tank through the recovery pipeline, or it can be connected to the recovery device on the shore through the outlet ends of the first and second gas phase pipes for recovery.

[0020] 3. The delivery speed of liquid nitrogen is adjusted in real time by frequency conversion control of the gear delivery pump, so that the transfer speed of liquid nitrogen is always matched with the power of the transfer pump, which not only ensures the transfer efficiency but also does not waste the power of the transfer pump.

[0021] 4. Not only can three methanol storage tanks be inerted at the same time, but also individual methanol storage tanks can be treated separately, so the use objects are more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the operation structure of the inerting system of the methanol fuel tank truck of a large container ship;

[0023] Among them, 1-first liquid phase pipe, 2-second liquid phase pipe, 3-liquid phase main pipe, 4-methanol storage tank, 5-first transfer pump, 6-second transfer pump, 7-first connecting valve, 8-second connecting valve, 9-first stop valve, 10-second stop valve, 11-first gas phase pipe, 12-second gas phase pipe, 13-gas phase main pipe, 14-remote control valve, 15-recovery pipeline, 16-recovery water tank, 17-first safety valve, 18-second safety valve, 19-bypass valve DETAILED DESCRIPTION

[0024] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0025] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixed connection" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0026] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0027] like Figure 1As shown, a large container ship methanol fuel tank tank truck inerting system includes a filling module, a return air module and a recovery module. The filling module includes a first liquid phase pipe 1 and a second liquid phase pipe 2. The first liquid phase pipe and the second liquid phase pipe merge into a liquid phase main pipe 3. The liquid phase main pipe is respectively connected to three methanol storage tanks 4. The first and second liquid phase pipe inlets are both provided with quick connectors adapted to the tank truck unloading hose. The first and second liquid phase pipes are respectively provided with a first transfer pump 5 and a second transfer pump 6. A first connecting pipe is provided between the liquid phase pipes at the front ends of the suction ports of the two transfer pumps. A first connecting pipe is provided on the first connecting pipe. A first connecting valve 7 is provided on the first connecting pipe. A second connecting pipe is provided between the liquid phase pipes at the rear ends of the outlets of the two transfer pumps. A second connecting pipe is provided with a second connecting valve 8. A first stop valve 9 is provided on the first liquid phase pipe at the rear end of the second connecting pipe. A second stop valve 10 is provided on the second liquid phase pipe at the rear end of the second connecting pipe. The return air module includes a first gas phase pipe 11 and a second gas phase pipe 12. The first and second gas phase pipes merge into a gas phase main pipe 13. , the gas phase main pipe is connected with the three methanol storage tanks respectively, the connecting ends of the liquid phase main pipe and the gas phase main pipe with the three methanol storage tanks are provided with a remote control valve 14, the liquid phase main pipe extends to the bottom of each methanol storage tank, and the gas phase main pipe extends to the top of each methanol storage tank, the recovery module includes a recovery pipeline 15 and a recovery water tank 16, the outlet end of the recovery pipeline is connected to the recovery water tank, the volume of the recovery water tank is 200L, and a vent pipe is provided on the top of the recovery water tank, the recovery pipeline and the first liquid phase pipe are connected between the outlet of the first transfer pump and the second connecting pipe, and a first safety valve 17 is provided between the recovery pipeline and the first liquid phase pipe, the recovery pipeline and the second liquid phase pipe are connected between the outlet of the second transfer pump and the second connecting pipe, and a second safety valve 18 is provided between the recovery pipeline and the second liquid phase pipe, the recovery pipeline is connected with the gas phase main pipe, and a bypass valve 19 is provided between the recovery pipeline and the gas phase main pipe, the first and second transfer pumps are variable frequency controlled gear delivery pumps, and the flow rates of the first and second transfer pumps are 100-200m 3 / H, the total capacity of the three methanol storage tanks is 11000m 3 .

[0028] A method for using an inerting system for a methanol fuel tank truck of a large container ship comprises the following steps:

[0029] Step 1: Connect the unloading hoses of the two tank trucks to the quick connectors of the first and second liquid phase pipes respectively;

[0030] Step 2: According to the internal conditions of the three methanol storage tanks, identify the methanol storage tanks that need to be inerted, open the remote control valves at the connecting ends of the corresponding methanol storage tanks and the liquid phase main pipe and the gas phase main pipe, open the bypass valve between the recovery pipeline and the gas phase main pipe, start the first and second transfer pumps, and perform inerting treatment on the methanol storage tanks. The methanol vapor and nitrogen remaining in the methanol storage tanks are discharged into the recovery water tank through the gas phase main pipe;

[0031] Step 3: When the two tank trucks are fully loaded with liquid nitrogen, adjust the operating power of the first and second transfer pumps to the maximum, i.e. 200m 3 / H, when the remaining liquid nitrogen capacity in the tank truck decreases, the operating power of the first and second transfer pumps is gradually reduced according to the remaining liquid nitrogen capacity;

[0032] Step 4: After the inerting treatment is completed, disconnect the unloading hose from the first and second liquid phase pipes, close the first stop valve and the second stop valve, open the first safety valve and the second safety valve, and use the first and second transfer pumps to recover the liquid nitrogen remaining in the first and second liquid phase pipes and transfer them to the recovery water tank;

[0033] Step 5: Stop the first and second transfer pumps, close the first and second safety valves and bypass valve. At this time, methanol vapor dissolves in the water in the recovery water tank. Open the air vent of the recovery water tank to release the nitrogen in the recovery water tank.

[0034] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A large container ship methanol fuel tank tanker inerting system, characterized by: The invention comprises a filling module, a gas return module and a recovery module, wherein the filling module comprises a first liquid phase pipe and a second liquid phase pipe, the first liquid phase pipe and the second liquid phase pipe merge into a liquid phase main pipe, the liquid phase main pipe is respectively connected to three methanol storage tanks, the first and second liquid phase pipe inlets are both provided with quick connectors adapted to the unloading hose of the tank truck, the first and second liquid phase pipes are respectively provided with a first transfer pump and a second transfer pump, a first connecting pipe is provided between the liquid phase pipes at the front ends of the suction ports of the two transfer pumps, a first connecting valve is provided on the first connecting pipe, a second connecting pipe is provided between the liquid phase pipes at the rear ends of the outlets of the two transfer pumps, a second connecting pipe is provided with a second connecting valve, a first stop valve is provided on the first liquid phase pipe at the rear end of the second connecting pipe, and a second stop valve is provided on the second liquid phase pipe at the rear end of the second connecting pipe, the gas return module comprises a first gas phase pipe and a second gas phase pipe, the first and second gas phase pipes merge into a gas phase main pipe, the gas phase main pipe is respectively connected to three methanol storage tanks, the recovery module comprises a recovery pipe The recovery pipeline and the recovery water tank, the recovery pipeline outlet end is connected to the recovery water tank, the recovery pipeline and the first liquid phase pipe are connected between the first transfer pump outlet and the second connecting pipe, the recovery pipeline and the second liquid phase pipe are connected between the second transfer pump outlet and the second connecting pipe, the recovery pipeline is connected to the gas phase main pipe, the first and second transfer pumps are variable frequency controlled gear delivery pumps, the flow rates of the first and second transfer pumps are 100-200m³ / H, the liquid phase main pipe and the gas phase main pipe are connected to the three methanol storage tanks. The connecting ends are provided with remote control valves, the liquid phase main pipe extends to the bottom of each methanol storage tank, and the gas phase main pipe extends to the top of each methanol storage tank. The total capacity of the three methanol storage tanks is 11000m³, the volume of the recovery water tank is 200L, and a vent pipe is provided on the top of the recovery water tank, a first safety valve is provided between the recovery pipeline and the first liquid phase pipe, a second safety valve is provided between the recovery pipeline and the second liquid phase pipe, and a bypass valve is provided between the recovery pipeline and the gas phase main pipe; The method for using the inerting system of the methanol fuel tank truck of a large container ship comprises the following steps: Step 1: Connect the unloading hoses of the two tank trucks to the quick connectors of the first and second liquid phase pipes respectively; Step 2: According to the internal conditions of the three methanol storage tanks, identify the methanol storage tanks that need to be inerted, open the remote control valves at the connecting ends of the corresponding methanol storage tanks and the liquid phase main pipe and the gas phase main pipe, open the bypass valve between the recovery pipeline and the gas phase main pipe, start the first and second transfer pumps, and perform inerting treatment on the methanol storage tanks. The methanol vapor and nitrogen remaining in the methanol storage tanks are discharged into the recovery water tank through the gas phase main pipe; Step 3: When the liquid nitrogen in the two tank trucks is fully loaded, adjust the operating power of the first and second transfer pumps to the maximum, that is, 200m³ / H. When the remaining liquid nitrogen capacity in the tank truck decreases, gradually reduce the operating power of the first and second transfer pumps according to the remaining liquid nitrogen capacity; Step 4: After the inerting treatment is completed, disconnect the unloading hose from the first and second liquid phase pipes, close the first stop valve and the second stop valve, open the first safety valve and the second safety valve, and use the first and second transfer pumps to recover the liquid nitrogen remaining in the first and second liquid phase pipes and transfer them to the recovery water tank; Step 5: Stop the first and second transfer pumps, close the first and second safety valves and bypass valve. At this time, methanol vapor dissolves in the water in the recovery water tank. Open the air vent of the recovery water tank to release the nitrogen in the recovery water tank.

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