Multifunctional skid for inerting, filling and residual liquid recycling of ship methanol fuel
By designing a multifunctional skid, the problems of insufficient multi-vehicle parallel filling capacity, poor ship type adaptability and low safety control redundancy of existing ship methanol filling equipment are solved, and efficient and safe methanol filling and residual liquid recovery are achieved.
Patent Information
- Application Number
- CN202511064894.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2025-10-10
AI Technical Summary
Existing ship methanol bunkering equipment has problems such as insufficient capacity for multiple vehicles to be bunkered in parallel, poor ship adaptability and low safety control redundancy, making it difficult to meet the needs of efficient bunkering and safe residual liquid recovery of large ships.
A multifunctional skid was designed, which included multiple filling lines, return air lines, residual liquid collection tanks, an ESD control system, and an SSL remote shutdown system. It adopted a multi-port compatible design, bypass pipes, and bypass valves, combined with gravity recovery and transfer pump recovery to achieve efficient methanol filling and residual liquid recovery.
It improves the methanol filling efficiency of large ships, enhances the adaptability of ship types, improves the safety control redundancy, and enhances the methanol residual liquid recovery rate.
Smart Images
Figure CN120757062A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ship filling equipment, and in particular to a multifunctional skid block for inerting, filling and residual liquid recovery of ship methanol fuel. Background Art
[0002] As a clean energy source, methanol fuel has become a key option for the shipping industry to achieve its emission reduction goals due to its low carbon emissions and high combustion efficiency. Compared with traditional marine fuels, methanol significantly reduces sulfur oxide, nitrogen oxide, and particulate matter emissions, complying with the environmental regulations of the International Maritime Organization (IMO). However, methanol is highly volatile, flammable, and toxic, requiring strict safety controls during its refueling process, placing higher demands on the system design of refueling equipment.
[0003] Currently, methanol bunkering on ships primarily relies on dock-mounted skid-type equipment. Existing technologies, such as patent CN223090451U, disclose a mobile intelligent bunkering skid. This system integrates bunkering lines, return air lines, a liquid collection tank, and a nitrogen inerting device to ensure methanol purity and recover residual liquid. While this solution can reduce residual methanol waste, it still has the following limitations:
[0004] 1. Insufficient parallel bunkering capacity for multiple vehicles: A single pump design cannot meet the efficient bunkering needs of large ships, especially container ships that require high-flow bunkering, resulting in low operational efficiency.
[0005] 2. Poor ship adaptability: The size differences and interface compatibility of different ships (such as bulk carriers, oil tankers, and ro-ro ships) are not taken into consideration, resulting in limited versatility of the skid;
[0006] 3. Low safety control redundancy: Residual liquid recovery relies on its own weight and a single pumping path. If the main pump fails, residual liquid recovery cannot be completed, and there is a lack of real-time oxygen content monitoring and emergency shut-off linkage mechanism.
[0007] Therefore, it is necessary to provide a multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel to solve the above technical problems. Summary of the Invention
[0008] The purpose of the present invention is to address the deficiencies of the existing technology and provide a multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel, so as to achieve efficient control of the entire process of methanol fuel from inerting, filling to residual liquid recovery.
[0009] To achieve the above object, the technical solution adopted by the present invention is:
[0010] The utility model provides a kind of methanol fuel inerting, filling, residual liquid recovery multifunctional pry block of ship, including movable box pry block, filling pipeline, return gas pipeline and residual liquid collection tank are installed in the pry block, the filling pipeline includes first filling pipe, second filling pipe, third filling pipe and filling main pipe, the outlet of first filling pipe, second filling pipe, third filling pipe is connected with filling main pipe respectively, the import of first, second, third filling pipe is equipped with quick coupling, and the outlet of filling main pipe is equipped with first insulation flange, the import of return gas pipeline is equipped with second insulation flange, and the outlet of return gas pipeline is communicated with residual liquid collection tank, the pry block further includes ESD control system and SSL remote shutdown system, and pry block bottom is equipped with liquid collecting pan.
[0011] Preferably, the first filling pipe is sequentially provided with a first filling valve, a first pipeline sight glass, a first transfer pump and a first stop check valve from left to right, the second filling pipe is sequentially provided with a second filling valve, a second pipeline sight glass, a second transfer pump and a second stop check valve from left to right, the third filling pipe is sequentially provided with a third filling valve, a third pipeline sight glass, a third transfer pump and a third stop check valve from left to right, and the filling main pipe is sequentially provided with an emergency shut-off valve, a pressure sensor, a temperature sensor, a fourth pipeline sight glass, a first sampler and a filling main valve from left to right.
[0012] Preferably, the first filling pipe and the second filling pipe are sequentially provided with a first bypass pipe, a second bypass pipe and a third bypass pipe, the connection point of the first bypass pipe and the first filling pipe is arranged at the left side of the first filling valve, the connection point of the first bypass pipe and the second filling pipe is arranged at the left side of the second filling valve, the first bypass pipe is respectively provided with a first bypass valve and a second bypass valve, the connection point of the second bypass pipe and the first filling pipe is arranged between the first pipeline sight glass and the first transfer pump, the connection point of the second bypass pipe and the second filling pipe is arranged between the second pipeline sight glass and the second transfer pump, the second bypass pipe is respectively provided with a third bypass valve and a fourth bypass valve, the connection point of the third bypass pipe and the first filling pipe is arranged between the first transfer pump and the first stop check valve, the connection point of the third bypass pipe and the second filling pipe is arranged between the second transfer pump and the second stop check valve, the third bypass pipe is respectively provided with a fifth bypass valve and a sixth bypass valve, a first connecting pipe is arranged between the first bypass pipe and the third bypass pipe, the connection point of the first connecting pipe and the first bypass pipe is arranged between the first bypass valve and the second bypass valve, the connection point of the first connecting pipe and the third bypass pipe is arranged between the fifth bypass valve and the sixth bypass valve, a second connecting pipe is arranged between the second bypass pipe and the filling main pipe, the connection point of the second connecting pipe and the second bypass pipe is arranged between the third bypass valve and the fourth bypass valve, and the connection point of the second connecting pipe and the filling main pipe is arranged at the left side of the emergency shut-off valve.
[0013] Preferably, the first pipe sight glass is connected to the first exhaust pipe, which is provided with a first exhaust valve; the second pipe sight glass is connected to the second exhaust pipe, which is provided with a second exhaust valve; the third pipe sight glass is connected to the third exhaust pipe, which is provided with a third exhaust valve; the first, second and third exhaust pipes are connected to the exhaust main pipe, which is connected to the residual liquid collection tank.
[0014] Preferably, the return air pipeline is provided with a return air valve, a second sampler, an oxygen content sensor and a pressure gauge in sequence from the inlet to the outlet.
[0015] Preferably, the residual liquid collection tank is provided with a breathing valve, a liquid level gauge and a residual discharge valve, the residual discharge valve is connected to the residual liquid emptying pipeline, a gravity recovery pipeline is provided between the filling main pipe and the residual liquid collection tank, and a recovery control valve is provided on the gravity recovery pipeline.
[0016] A method for using a multifunctional skid for inerting, filling, and residual liquid recovery of ship methanol fuel comprises the following steps:
[0017] Step 1: Nitrogen inerting:
[0018] Step 101, inerting preparation: keep the emergency shut-off valve and the main filling valve on the filling main pipe in the normally open state, and inject 200L of water into the residual liquid collection tank with a volume of 1 cubic meter;
[0019] Step 102: Select nitrogen injection path:
[0020] Step 1021: Select the quick connector of the first filling pipe to connect with nitrogen: open the first bypass valve, the fifth bypass valve, and the first stop check valve, close the first filling valve, the second bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve, and allow 5 bar nitrogen to pass through the first bypass valve, the fifth bypass valve, the first stop check valve, the emergency shut-off valve, and the main filling valve in sequence until the nitrogen enters the ship methanol system from the first insulating flange; alternatively, open the first bypass valve, the sixth bypass valve, and the second stop check valve, close the first filling valve, the second bypass valve, the third bypass valve, the fourth bypass valve, and the fifth bypass valve, and allow 5 bar nitrogen to pass through the first bypass valve, the sixth bypass valve, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence until the nitrogen enters the ship methanol piping system from the first insulating flange, thereby inerting the ship methanol piping system;
[0021] Step 1022, select the quick connector of the second filling pipe to be communicated with nitrogen: open the second bypass valve, the fifth bypass valve and the first stop check valve, close the second filling valve, the first bypass valve, the third bypass valve, the fourth bypass valve and the sixth bypass valve, make 5 bar nitrogen pass through the second bypass valve, the fifth bypass valve, the first stop check valve, the emergency cut-off valve and the filling main valve in sequence until the nitrogen enters the methanol system of the ship from the first insulation flange; or select to open the second bypass valve, the sixth bypass valve and the second stop check valve, close the second filling valve, the first bypass valve, the third bypass valve, the fourth bypass valve and the fifth bypass valve, make 5 bar nitrogen pass through the second bypass valve, the sixth bypass valve, the second stop check valve, the emergency cut-off valve and the filling main valve in sequence until the nitrogen enters the methanol pipeline of the ship from the first insulation flange, and inert the methanol pipeline of the ship;
[0022] Step 103, gas return treatment: open the gas return valve, make the gas return in the methanol pipeline of the ship pass through the second sampler, the oxygen content sensor and the pressure gauge of the gas return pipeline in sequence until the gas return enters the residual liquid collection tank, and then pass through the breather valve of the residual liquid collection tank to discharge the gas return into the atmosphere; in the process of nitrogen inerting, in order to avoid the PV valve of the methanol tank being opened, control the flow of injected nitrogen by observing the reading of the pressure gauge, so that the reading of the pressure gauge does not exceed 0.3 bar, observe the reading of the oxygen content sensor, and when it is detected that the oxygen content of the gas return in the gas return pipeline is lower than 6%, continue to maintain nitrogen supply for 10 minutes, if the oxygen content of the gas return in the gas return pipeline is always lower than 6%, stop the nitrogen supply, and the inerting is completed;
[0023] Step 2, methanol filling;
[0024] Step 201, filling preparation: keep the emergency cut-off valve and the filling main valve on the filling main pipe in the open state;
[0025] Step 202, select the methanol filling path:
[0026] Step 2021, select the first filling pipe to fill methanol: connect the unloading hose of the tank truck with the quick connector of the first filling pipe, open the first filling valve, the first exhaust valve and the first stop check valve, close the first bypass valve, the third bypass valve, the fourth bypass valve and the fifth bypass valve, close the first exhaust valve when it is observed that the first pipeline sight glass is filled with methanol, start the first transfer pump, make the methanol pass through the first filling valve, the first transfer pump, the first stop check valve, the emergency cut-off valve and the filling main valve in sequence, and fill the ship with methanol;
[0027] Step 2022: Select the second filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the second filling pipe, open the second filling valve, the second exhaust valve, and the second stop check valve, and close the second bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve. When the second pipe sight glass is observed to be full of methanol, close the second exhaust valve and start the second transfer pump to allow methanol to flow through the second filling valve, the second transfer pump, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol.
[0028] Step 2023: Select the third filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the third filling pipe, open the third filling valve, the third exhaust valve, and the third stop check valve, and close the third bypass valve and the fourth bypass valve. When the third pipe sight glass is observed to be full of methanol, close the third exhaust valve and start the third transfer pump to allow methanol to flow through the third filling valve, the third transfer pump, the third stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol.
[0029] Step 203, methanol gas return gas treatment: open the return gas valve to allow the return gas containing methanol gas to enter the residual liquid collection tank through the return gas pipeline, and the return gas containing methanol gas is dissolved and absorbed by the water in the residual liquid collection tank;
[0030] Step 3, methanol residue recovery:
[0031] Step 301, gravity recovery: The filling pipeline is located above the skid, and the residual liquid collection tank is located below the skid. The recovery control valve is opened to use gravity potential energy to recover some of the methanol residual liquid in the filling pipeline into the residual liquid collection tank.
[0032] Step 302, recovery by transfer pump: The residual methanol liquid remaining in the filling pipeline cannot be recovered to the residual liquid collection tank by gravity potential energy, so a transfer pump is required to recover the residual methanol liquid remaining in the filling pipeline;
[0033] Step 3021: Select the first transfer pump to recover residual liquid: open the first bypass valve, the third bypass valve, the fifth bypass valve, the emergency shut-off valve, and the main filling valve, close the other valves, start the first transfer pump, and pump the remaining methanol residual liquid in the filling pipeline into the tank truck in the order of the main filling valve, the emergency shut-off valve, the third bypass valve, the first transfer pump, the fifth bypass valve, and the first bypass valve.
[0034] Step 3022: Select the second transfer pump to recover residual liquid: open the second bypass valve, the fourth bypass valve, the sixth bypass valve, the emergency shut-off valve, and the main filling valve, close the other valves, start the second transfer pump, and pump the remaining methanol residual liquid in the filling pipeline into the tank truck in the order of the main filling valve, the emergency shut-off valve, the fourth bypass valve, the second transfer pump, the sixth bypass valve, and the second bypass valve.
[0035] Step 4: Disconnect the connection between the skid and the tank truck, and the methanol residual liquid recovery is completed.
[0036] Compared with the prior art, the present invention has the following advantages:
[0037] 1. The first, second and third filling pipes are equipped with quick connectors and adopt a multi-interface compatible design to adapt to methanol filling of different ships.
[0038] 2. Utilize multiple bypass pipes and bypass valves to achieve conversion function by switching a single valve, optimizing pipeline valve logic.
[0039] 3. The combination of gravity recovery and transfer pump recovery greatly improves the recovery rate of methanol residue. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] Figure 1 This is the system working principle diagram of the present invention
[0041] Among them, 1-residual liquid collection tank, 2-quick connector, 3-first insulating flange, 4-second insulating flange, 5-ESD control system, 6-liquid collection tray, 7-first filling valve, 8-first pipeline sight glass, 9-first transfer pump, 10-first stop check valve, 11-second filling valve, 12-second pipeline sight glass, 13-second transfer pump, 14-second stop check valve, 15-third filling valve, 16-third pipeline sight glass, 17-third transfer pump, 18-third stop check valve, 19-emergency shut-off valve, 2 0-pressure sensor, 21-temperature sensor, 22-fourth pipe sight glass, 23-first sampler, 24-filling main valve, 25-first bypass valve, 26-second bypass valve, 27-third bypass valve, 28-fourth bypass valve, 29-fifth bypass valve, 30-sixth bypass valve, 31-first exhaust valve, 32-second exhaust valve, 33-third exhaust valve, 34-return valve, 35-second sampler, 36-pressure gauge, 37-breathing valve, 38-liquid level gauge, 39-residual valve, 40-recovery control valve DETAILED DESCRIPTION
[0042] The present invention is further illustrated below with reference to 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, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.
[0043] 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.
[0044] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", and "top" 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.
[0045] like Figure 1 As shown, a multifunctional skid for inerting, filling, and residual liquid recovery of methanol fuel for ships includes a movable box-type skid. A filling pipeline, a return air pipeline, and a residual liquid collection tank 1 are installed in the skid. Considering the characteristics of methanol, the filling pipeline and the return air pipeline are all made of 304 stainless steel pipes. The filling pipeline includes a first filling pipe, a second filling pipe, a third filling pipe, and a filling main pipe. The outlets of the first filling pipe, the second filling pipe, and the third filling pipe are respectively connected to the filling main pipe. The inlets of the first, second, and third filling pipes are all equipped with quick connectors 2. The outlet of the filling main pipe is provided with a first insulating flange 3, which is connected to the inlet of the ship's methanol piping system. The inlet of the return air pipeline is provided with a second insulating flange 4, which is connected to the ship's return air pipe. The outlet of the return air pipeline is connected to the residual liquid collection tank and is located at the lower part of the residual liquid collection tank. The skid also includes an ESD control system 5 and an SSL remote shutdown system. The ESD control system is used to stop the pump in an emergency and close the emergency shut-off valve. A liquid collection tray 6 is installed at the bottom of the skid to collect methanol leaked from the skid during the filling process.
[0046] The first filling pipe is provided with the first filling valve 7, the first pipeline sight glass 8, the first transfer pump 9 and the first stop check valve 10 from left to right. The second filling pipe is provided with the second filling valve 11, the second pipeline sight glass 12, the second transfer pump 13 and the second stop check valve 14 from left to right. The third filling pipe is provided with the third filling valve 15, the third pipeline sight glass 16, the third transfer pump 17 and the third stop check valve 18 from left to right. The filling main pipe is provided with the emergency shut-off valve 19, the pressure sensor 20, the temperature sensor 21, the fourth pipeline sight glass 22, the first sampler 23 and the filling main valve 24 from left to right. The filling flow rate of a single transfer pump is 60m 3 / h, the lift is 45 meters, and each transfer pump can be started and stopped independently.
[0047] A first bypass pipe, a second bypass pipe and a third bypass pipe are sequentially provided between the first filling pipe and the second filling pipe. The connection point between the first bypass pipe and the first filling pipe is arranged on the left side of the first filling valve, and the connection point between the first bypass pipe and the second filling pipe is arranged on the left side of the second filling valve. The first bypass pipe is respectively provided with a first bypass valve 25 and a second bypass valve 26. The connection point between the second bypass pipe and the first filling pipe is arranged between the first pipeline sight glass and the first transfer pump. The connection point between the second bypass pipe and the second filling pipe is arranged between the second pipeline sight glass and the second transfer pump. The second bypass pipe is respectively provided with a third bypass valve 27 and a fourth bypass valve 28. The connection point between the third bypass pipe and the first filling pipe is arranged on the first transfer pump. and the first stop check valve, the connection point of the third bypass pipe and the second filling pipe is set between the second transfer pump and the second stop check valve, the third bypass pipe is respectively provided with a fifth bypass valve 29 and a sixth bypass valve 30, a first connecting pipe is provided between the first bypass pipe and the third bypass pipe, the connection point of the first connecting pipe and the first bypass pipe is set between the first bypass valve and the second bypass valve, the connection point of the first connecting pipe and the third bypass pipe is set between the fifth bypass valve and the sixth bypass valve, a second connecting pipe is provided between the second bypass pipe and the filling main pipe, the connection point of the second connecting pipe and the second bypass pipe is set between the third bypass valve and the fourth bypass valve, and the connection point of the second connecting pipe and the filling main pipe is set on the left side of the emergency shut-off valve.
[0048] A first pipe sight glass is connected to a first exhaust pipe, which is provided with a first exhaust valve 31. A second pipe sight glass is connected to a second exhaust pipe, which is provided with a second exhaust valve 32. A third pipe sight glass is connected to a third exhaust pipe, which is provided with a third exhaust valve 33. The first, second, and third exhaust pipes are connected to an exhaust manifold, which is connected to a residual liquid collection tank. When methanol is introduced, the pipe sight glass is used to observe whether there is gas in the pipe. The exhaust valve is used to expel air from the pipe. The air mixed with methanol is discharged into the residual liquid collection tank, where the methanol is dissolved and absorbed by water.
[0049] The return air pipeline is provided with a return air valve 34, a second sampler 35, an oxygen content sensor and a pressure gauge 36 in sequence from the inlet to the outlet.
[0050] The residual liquid collection tank is provided with a breathing valve 37, a liquid level meter 38 and a residual liquid discharge valve 39. The residual liquid discharge valve is arranged at the bottom of the residual liquid collection tank. The residual liquid discharge valve is connected to the residual liquid emptying pipeline. A gravity recovery pipeline is provided between the filling main pipe and the residual liquid collection tank. A recovery control valve 40 is provided on the gravity recovery pipeline.
[0051] A method for using a multifunctional skid for inerting, filling, and residual liquid recovery of ship methanol fuel comprises the following steps:
[0052] Step 1: Nitrogen inerting:
[0053] Step 101, inerting preparation: keep the emergency shut-off valve and the main filling valve on the filling main pipe in the normally open state, and inject 200L of water into a residual liquid collection tank with a volume of 1 cubic meter to dissolve methanol;
[0054] Step 102: Select nitrogen injection path:
[0055] Step 1021: Select the quick connector of the first filling pipe to connect with nitrogen: open the first bypass valve, the fifth bypass valve, and the first stop check valve, close the first filling valve, the second bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve, and allow 5 bar nitrogen to pass through the first bypass valve, the fifth bypass valve, the first stop check valve, the emergency shut-off valve, and the main filling valve in sequence until the nitrogen enters the ship methanol system from the first insulating flange; alternatively, open the first bypass valve, the sixth bypass valve, and the second stop check valve, close the first filling valve, the second bypass valve, the third bypass valve, the fourth bypass valve, and the fifth bypass valve, and allow 5 bar nitrogen to pass through the first bypass valve, the sixth bypass valve, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence until the nitrogen enters the ship methanol piping system from the first insulating flange, thereby inerting the ship methanol piping system;
[0056] Step 1022: Select the quick connector of the second filling pipe to connect with nitrogen: open the second bypass valve, the fifth bypass valve, and the first stop check valve, and close the second filling valve, the first bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve, so that 5 bar nitrogen passes through the second bypass valve, the fifth bypass valve, the first stop check valve, the emergency shut-off valve, and the main filling valve in sequence until nitrogen enters the ship methanol system from the first insulating flange; alternatively, open the second bypass valve, the sixth bypass valve, and the second stop check valve, and close the second filling valve, the first bypass valve, the third bypass valve, the fourth bypass valve, and the fifth bypass valve, so that 5 bar nitrogen passes through the second bypass valve, the sixth bypass valve, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence until nitrogen enters the ship methanol piping system from the first insulating flange, thereby inerting the ship methanol piping system;
[0057] Step 103, return air processing: open the return air valve to allow the return air in the ship's methanol piping system to pass through the second sampler, oxygen content sensor, and pressure gauge of the return air pipeline in sequence until the return air enters the residual liquid collection tank, and then is discharged into the atmosphere through the breathing valve of the residual liquid collection tank; during the nitrogen inerting process, to prevent the PV valve of the methanol tank from opening, the flow rate of injected nitrogen is controlled by observing the reading of the pressure gauge so that the reading of the pressure gauge does not exceed 0.3 bar, and the reading of the oxygen content sensor is observed. When the oxygen content of the return air in the return air pipeline is detected to be lower than 6%, the nitrogen supply is continued for 10 minutes. If the oxygen content of the return air in the return air pipeline is always lower than 6%, the nitrogen supply is stopped, and the inerting is completed;
[0058] Step 2, adding methanol;
[0059] Step 201, filling preparation: keep the emergency shut-off valve and the filling main valve on the filling main pipe in a normally open state;
[0060] Step 202: Select the methanol filling path:
[0061] Step 2021: Select the first filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the first filling pipe, open the first filling valve, the first exhaust valve, and the first stop check valve, and close the first bypass valve, the third bypass valve, the fourth bypass valve, and the fifth bypass valve. When the first pipe sight glass is observed to be full of methanol, close the first exhaust valve and start the first transfer pump to allow methanol to flow through the first filling valve, the first transfer pump, the first stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol.
[0062] Step 2022: Select the second filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the second filling pipe, open the second filling valve, the second exhaust valve, and the second stop check valve, and close the second bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve. When the second pipe sight glass is observed to be full of methanol, close the second exhaust valve and start the second transfer pump to allow methanol to flow through the second filling valve, the second transfer pump, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol.
[0063] Step 2023: Select the third filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the third filling pipe, open the third filling valve, the third exhaust valve, and the third stop check valve, and close the third bypass valve and the fourth bypass valve. When the third pipe sight glass is observed to be full of methanol, close the third exhaust valve and start the third transfer pump to allow methanol to flow through the third filling valve, the third transfer pump, the third stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol.
[0064] Step 203, methanol gas return gas treatment: open the return gas valve to allow the return gas containing methanol gas to enter the residual liquid collection tank through the return gas pipeline, and the return gas containing methanol gas is dissolved and absorbed by the water in the residual liquid collection tank;
[0065] When methanol needs to be quickly added, three tank trucks can be connected to the quick connectors of the first filling pipe, the second filling pipe and the third filling pipe respectively at the same time. According to the operation sequence in the above steps 2021, 2022 and 2023, the first transfer pump, the second transfer pump and the third transfer pump are started at the same time to add methanol to the ship, so as to obtain a filling speed of 2-3 times.
[0066] Step 3, methanol residue recovery:
[0067] Step 301, gravity recovery: The filling pipeline is located above the skid, and the residual liquid collection tank is located below the skid. The recovery control valve is opened to use gravity potential energy to recover some of the methanol residual liquid in the filling pipeline into the residual liquid collection tank.
[0068] Step 302, recovery by transfer pump: The residual methanol liquid remaining in the filling pipeline cannot be recovered to the residual liquid collection tank by gravity potential energy, so a transfer pump is required to recover the residual methanol liquid remaining in the filling pipeline;
[0069] Step 3021: Select the first transfer pump to recover residual liquid: open the first bypass valve, the third bypass valve, the fifth bypass valve, the emergency shut-off valve, and the main filling valve, close the other valves, start the first transfer pump, and pump the remaining methanol residual liquid in the filling pipeline into the tank truck in the order of the main filling valve, the emergency shut-off valve, the third bypass valve, the first transfer pump, the fifth bypass valve, and the first bypass valve.
[0070] Step 3022: Select the second transfer pump to recover residual liquid: open the second bypass valve, the fourth bypass valve, the sixth bypass valve, the emergency shut-off valve, and the main filling valve, close the other valves, start the second transfer pump, and pump the remaining methanol residual liquid in the filling pipeline into the tank truck in the order of the main filling valve, the emergency shut-off valve, the fourth bypass valve, the second transfer pump, the sixth bypass valve, and the second bypass valve.
[0071] Step 4: Disconnect the skid and the tank truck, and the methanol residual liquid recovery is completed.
[0072] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the appended claims.
Claims
1. A multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel, characterized by: The invention comprises a movable box-type skid block, wherein a filling pipeline, a return air pipeline and a residual liquid collection tank (1) are installed in the skid block, wherein the filling pipeline comprises a first filling pipe, a second filling pipe, a third filling pipe and a filling main pipe, wherein the outlets of the first filling pipe, the second filling pipe and the third filling pipe are respectively connected to the filling main pipe, wherein the inlets of the first, second and third filling pipes are all provided with quick connectors (2), the outlet of the filling main pipe is provided with a first insulating flange (3), the inlet of the return air pipeline is provided with a second insulating flange (4), and the outlet of the return air pipeline is connected to the residual liquid collection tank, wherein the skid block further comprises an ESD control system (5) and an SSL remote shutdown system, and a liquid collecting tray (6) is installed at the bottom of the skid block.
2. The multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel according to claim 1, characterized in that: The first filling pipe is provided with a first filling valve (7), a first pipeline sight glass (8), a first transfer pump (9) and a first stop-check valve (10) in sequence from left to right; the second filling pipe is provided with a second filling valve (11), a second pipeline sight glass (12), a second transfer pump (13) and a second stop-check valve (14) in sequence from left to right; the third filling pipe is provided with a third filling valve (15), a third pipeline sight glass (16), a third transfer pump (17) and a third stop-check valve (18) in sequence from left to right; and the filling main pipe is provided with an emergency shut-off valve (19), a pressure sensor (20), a temperature sensor (21), a fourth pipeline sight glass (22), a first sampler (23) and a filling main valve (24) in sequence from left to right.
3. The multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel according to claim 2, characterized in that: A first bypass pipe, a second bypass pipe and a third bypass pipe are sequentially provided between the first filling pipe and the second filling pipe. The connection point between the first bypass pipe and the first filling pipe is arranged on the left side of the first filling valve, and the connection point between the first bypass pipe and the second filling pipe is arranged on the left side of the second filling valve. A first bypass valve (25) and a second bypass valve (26) are respectively provided on the first bypass pipe. The connection point between the second bypass pipe and the first filling pipe is arranged between the first pipeline sight glass and the first transfer pump. The connection point between the second bypass pipe and the second filling pipe is arranged between the second pipeline sight glass and the second transfer pump. A third bypass valve (27) and a fourth bypass valve (28) are respectively provided on the second bypass pipe. The connection point between the third bypass pipe and the first filling pipe is arranged between the first pipeline sight glass and the second transfer pump. A connection point between the transfer pump and the first stop check valve, a connection point between the third bypass pipe and the second filling pipe is set between the second transfer pump and the second stop check valve, a fifth bypass valve (29) and a sixth bypass valve (30) are respectively provided on the third bypass pipe, a first connecting pipe is provided between the first bypass pipe and the third bypass pipe, a connection point between the first connecting pipe and the first bypass pipe is set between the first bypass valve and the second bypass valve, a connection point between the first connecting pipe and the third bypass pipe is set between the fifth bypass valve and the sixth bypass valve, a second connecting pipe is provided between the second bypass pipe and the filling main pipe, a connection point between the second connecting pipe and the second bypass pipe is set between the third bypass valve and the fourth bypass valve, and a connection point between the second connecting pipe and the filling main pipe is set on the left side of the emergency shut-off valve.
4. The multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel according to claim 2, characterized in that: The first pipe sight glass is connected to a first exhaust pipe, which is provided with a first exhaust valve (31); the second pipe sight glass is connected to a second exhaust pipe, which is provided with a second exhaust valve (32); the third pipe sight glass is connected to a third exhaust pipe, which is provided with a third exhaust valve (33); the first, second and third exhaust pipes are connected to an exhaust main pipe, which is connected to a residual liquid collection tank.
5. The multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel according to claim 1, characterized in that: The return air pipeline is provided with a return air valve (34), a second sampler (35), an oxygen content sensor and a pressure gauge (36) in sequence from the inlet to the outlet.
6. The multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel according to claim 1, characterized in that: The residual liquid collection tank is provided with a breathing valve (37), a liquid level meter (38) and a residual discharge valve (39), the residual discharge valve is connected to the residual liquid emptying pipeline, a gravity recovery pipeline is provided between the filling main pipe and the residual liquid collection tank, and a recovery control valve (40) is provided on the gravity recovery pipeline.
7. The method for using the multifunctional skid for inerting, filling and residual liquid recovery of ship methanol fuel according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Nitrogen inerting: Step 101, inerting preparation: keep the emergency shut-off valve and the main filling valve on the filling main pipe in the normally open state, and inject 200L of water into the residual liquid collection tank with a volume of 1 cubic meter; Step 102: Select nitrogen injection path: Step 1021: Select the quick connector of the first filling pipe to connect with nitrogen: open the first bypass valve, the fifth bypass valve, and the first stop check valve, close the first filling valve, the second bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve, and allow 5 bar nitrogen to pass through the first bypass valve, the fifth bypass valve, the first stop check valve, the emergency shut-off valve, and the main filling valve in sequence until the nitrogen enters the ship methanol system from the first insulating flange; alternatively, open the first bypass valve, the sixth bypass valve, and the second stop check valve, close the first filling valve, the second bypass valve, the third bypass valve, the fourth bypass valve, and the fifth bypass valve, and allow 5 bar nitrogen to pass through the first bypass valve, the sixth bypass valve, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence until the nitrogen enters the ship methanol piping system from the first insulating flange, thereby inerting the ship methanol piping system; Step 1022: Select the quick connector of the second filling pipe to connect with nitrogen: open the second bypass valve, the fifth bypass valve, and the first stop check valve, and close the second filling valve, the first bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve, so that 5 bar nitrogen passes through the second bypass valve, the fifth bypass valve, the first stop check valve, the emergency shut-off valve, and the main filling valve in sequence until nitrogen enters the ship methanol system from the first insulating flange; alternatively, open the second bypass valve, the sixth bypass valve, and the second stop check valve, and close the second filling valve, the first bypass valve, the third bypass valve, the fourth bypass valve, and the fifth bypass valve, so that 5 bar nitrogen passes through the second bypass valve, the sixth bypass valve, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence until nitrogen enters the ship methanol piping system from the first insulating flange, thereby inerting the ship methanol piping system; Step 103, return air processing: open the return air valve to allow the return air in the ship's methanol piping system to pass through the second sampler, oxygen content sensor, and pressure gauge of the return air pipeline in sequence until the return air enters the residual liquid collection tank, and then is discharged into the atmosphere through the breathing valve of the residual liquid collection tank; during the nitrogen inerting process, to prevent the PV valve of the methanol tank from opening, the flow rate of injected nitrogen is controlled by observing the reading of the pressure gauge so that the reading of the pressure gauge does not exceed 0.3 bar, and the reading of the oxygen content sensor is observed. When the oxygen content of the return air in the return air pipeline is detected to be lower than 6%, the nitrogen supply is continued for 10 minutes. If the oxygen content of the return air in the return air pipeline is always lower than 6%, the nitrogen supply is stopped, and the inerting is completed; Step 2, adding methanol; Step 201, filling preparation: keep the emergency shut-off valve and the filling main valve on the filling main pipe in a normally open state; Step 202: Select the methanol filling path: Step 2021: Select the first filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the first filling pipe, open the first filling valve, the first exhaust valve, and the first stop check valve, and close the first bypass valve, the third bypass valve, the fourth bypass valve, and the fifth bypass valve. When the first pipe sight glass is observed to be full of methanol, close the first exhaust valve and start the first transfer pump to allow methanol to flow through the first filling valve, the first transfer pump, the first stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol. Step 2022: Select the second filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the second filling pipe, open the second filling valve, the second exhaust valve, and the second stop check valve, and close the second bypass valve, the third bypass valve, the fourth bypass valve, and the sixth bypass valve. When the second pipe sight glass is observed to be full of methanol, close the second exhaust valve and start the second transfer pump to allow methanol to flow through the second filling valve, the second transfer pump, the second stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol. Step 2023: Select the third filling pipe for methanol filling: Connect the tank truck's unloading hose to the quick connector of the third filling pipe, open the third filling valve, the third exhaust valve, and the third stop check valve, and close the third bypass valve and the fourth bypass valve. When the third pipe sight glass is observed to be full of methanol, close the third exhaust valve and start the third transfer pump to allow methanol to flow through the third filling valve, the third transfer pump, the third stop check valve, the emergency shut-off valve, and the main filling valve in sequence, thereby filling the ship with methanol. Step 203, methanol gas return gas treatment: open the return gas valve to allow the return gas containing methanol gas to enter the residual liquid collection tank through the return gas pipeline, and the return gas containing methanol gas is dissolved and absorbed by the water in the residual liquid collection tank; Step 3, methanol residue recovery: Step 301, gravity recovery: The filling pipeline is located above the skid, and the residual liquid collection tank is located below the skid. The recovery control valve is opened to use gravity potential energy to recover some of the methanol residual liquid in the filling pipeline into the residual liquid collection tank. Step 302, recovery by transfer pump: The residual methanol liquid remaining in the filling pipeline cannot be recovered to the residual liquid collection tank by gravity potential energy, so a transfer pump is required to recover the residual methanol liquid remaining in the filling pipeline; Step 3021: Select the first transfer pump to recover residual liquid: open the first bypass valve, the third bypass valve, the fifth bypass valve, the emergency shut-off valve, and the main filling valve, close the other valves, start the first transfer pump, and pump the remaining methanol residual liquid in the filling pipeline into the tank truck in the order of the main filling valve, the emergency shut-off valve, the third bypass valve, the first transfer pump, the fifth bypass valve, and the first bypass valve. Step 3022: Select the second transfer pump to recover residual liquid: open the second bypass valve, the fourth bypass valve, the sixth bypass valve, the emergency shut-off valve, and the main filling valve, close the other valves, start the second transfer pump, and pump the remaining methanol residual liquid in the filling pipeline into the tank truck in the order of the main filling valve, the emergency shut-off valve, the fourth bypass valve, the second transfer pump, the sixth bypass valve, and the second bypass valve. Step 4: Disconnect the connection between the skid and the tank truck, and the methanol residual liquid recovery is completed.