LNG (Liquefied Natural Gas) double-lug storage tank low-temperature conveying system

Abstract

The utility model discloses an LNG double-lug storage tank low-temperature conveying system which comprises a left-lug LNG low-temperature conveying pump and a right-lug LNG low-temperature conveying pump, an inlet of the left-lug LNG low-temperature conveying pump is connected with a left-lug LNG low-temperature conveying pump suction pipe, and an inlet of the right-lug LNG low-temperature conveying pump is connected with a right-lug LNG low-temperature conveying pump suction pipe. The left-ear LNG low-temperature delivery pump suction pipe and the right-ear LNG low-temperature delivery pump suction pipe are communicated through a communicating pipe, and the communicating point of the communicating pipe and the left-ear LNG low-temperature delivery pump suction pipe and the communicating point of the communicating pipe and the right-ear LNG low-temperature delivery pump suction pipe are located above inlets of the left-ear LNG low-temperature delivery pump suction pipe and the right-ear LNG low-temperature delivery pump suction pipe. A communicating pipe isolating valve is arranged on the communicating pipe, and the communicating pipe isolating valve is a fault closing type remote control valve. According to the low-temperature conveying system for the LNG double-lug storage tank, the two low-temperature conveying pumps are guaranteed to be standby for each other, and the risk that when one pump breaks down, too much LNG is left and cannot be pumped out is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ship fuel equipment, in particular to a low-temperature delivery system for an LNG double-ear storage tank. Background Art

[0002] For LNG binaural storage tanks, a cryogenic delivery pump is usually configured on each side. Each cryogenic delivery pump is responsible for delivering LNG on each side of the binaural delivery tank. At normal LNG liquid level, each pump can normally pump out the LNG on its side. Even when one pump fails, the other pump can pump out the LNG liquid on both sides. However, when the LNG liquid level is lower than the partition structure in the middle of the LNG binaural storage tank, and the LNG liquid level is also lower than the partition in the middle of the binaural tank, any cryogenic delivery pump will not be able to pump the LNG on the other side, which will lead to a waste of LNG. LNG is an ultra-low temperature liquid. When the liquid level inside the binaural storage tank decreases, the pressure will also decrease. At this time, LNG will vaporize very quickly, which will greatly reduce the storage time of LNG in the binaural storage tank. Therefore, if measures are taken to pump out all LNG in the event of a failure of a cryogenic delivery pump and avoid the accelerated vaporization of LNG, it is a technical problem that we urgently need to solve. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an LNG double-ear storage tank low-temperature delivery system, which ensures that the two low-temperature delivery pumps can realize the function of backing up each other, avoiding the risk of too much remaining LNG being unable to be pumped out when one pump fails.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A low-temperature delivery system for an LNG double-ear storage tank comprises a left-ear LNG low-temperature delivery pump and a right-ear LNG low-temperature delivery pump, wherein the inlet of the left-ear LNG low-temperature delivery pump is connected with a left-ear LNG low-temperature delivery pump suction pipe, and the inlet of the right-ear LNG low-temperature delivery pump is connected with the right-ear LNG low-temperature delivery pump suction pipe, the left-ear LNG low-temperature delivery pump suction pipe and the right-ear LNG low-temperature delivery pump suction pipe are connected through a connecting pipe, and the connecting point between the connecting pipe and the left-ear LNG low-temperature delivery pump suction pipe and the right-ear LNG low-temperature delivery pump suction pipe is located above the inlets of the left-ear LNG low-temperature delivery pump suction pipe and the right-ear LNG low-temperature delivery pump suction pipe; a connecting pipe isolation valve is provided on the connecting pipe, and the connecting pipe isolation valve is a fault-closing type remote control valve.

[0006] Furthermore, a left ear LNG cryogenic transfer pump suction valve and a right ear LNG cryogenic transfer pump suction valve are respectively provided on the left ear LNG cryogenic transfer pump suction pipe and the right ear LNG cryogenic transfer pump suction pipe, and the connecting point between the connecting pipe and the left ear LNG cryogenic transfer pump suction pipe and the right ear LNG cryogenic transfer pump suction pipe is located on the inlet side of the left ear LNG cryogenic transfer pump suction valve and the right ear LNG cryogenic transfer pump suction valve close to the left ear LNG cryogenic transfer pump suction pipe and the right ear LNG cryogenic transfer pump suction pipe.

[0007] Furthermore, the left-ear LNG cryogenic transfer pump suction valve and the right-ear LNG cryogenic transfer pump suction valve are both fail-open type remote control valves.

[0008] Furthermore, a left ear LNG cryogenic delivery pump suction pipe suction port and a right ear LNG cryogenic delivery pump suction pipe suction port are respectively provided at the inlets of the left ear LNG cryogenic delivery pump suction pipe and the right ear LNG cryogenic delivery pump suction pipe.

[0009] Furthermore, the system also includes a control system, and the left ear LNG cryogenic transfer pump suction valve, the right ear LNG cryogenic transfer pump suction valve, the connecting pipe isolation valve, the left ear LNG cryogenic transfer pump and the right ear cryogenic transfer pump are all connected to the control system by telecommunication control.

[0010] The utility model discloses a low-temperature delivery system for LNG binaural storage tanks, firstly, a remote control valve is added to the suction pipe of each low-temperature delivery pump, under normal working conditions, the two remote control valves are kept normally open, and the two valves are of a fault-open type, so as to ensure that the suction pipe of the pump remains unobstructed under any circumstances; in addition, stainless steel pipes are used to connect the ends of the suction pipes of the two pumps, and a remote control valve is installed in the middle of the connecting pipe, which is kept normally closed at ordinary times. When one pump fails and the LNG liquid level is lower than the partition structure in the middle of the binaural storage tank, the remote control valve can be opened when another pump is needed to suck the liquid on this side, but the remote control valve must be of a fault-closed type, so as to ensure that under any working conditions, the two pumps can work normally at the same time or work separately.

[0011] The utility model can realize the role of two pumps serving as backup for each other by simply adding three remote control valves and a connecting pipeline. It is no longer necessary to use two pumps on each side of the double-ear tank, which greatly reduces the production and design costs. This design scheme has been recognized by the classification society and fully meets the requirements of the specifications. It can also reduce the space design of the TCS, reduce the construction cost of the ship, and improve the operating economy of the shipowner. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the low-temperature transportation system of the LNG double-ear storage tank described in the utility model.

[0013] Among them, 1-LNG double-ear storage tank body, 2-TCS control system, 3-left ear LNG cryogenic transfer pump, 4-right ear LNG cryogenic transfer pump, 5-left ear LNG cryogenic transfer pump suction pipe, 6-left ear LNG cryogenic transfer pump suction valve, 7-left ear LNG cryogenic transfer pump suction pipe suction port, 8-right ear LNG cryogenic transfer pump suction pipe, 9-right ear LNG cryogenic transfer pump suction valve, 10-right ear LNG cryogenic transfer pump suction pipe suction port, 11-connecting pipe, 12-connecting pipe isolation valve, 13-middle partition of LNG double-ear storage tank. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] like Figure 1 As shown, a low-temperature delivery system for an LNG double-ear storage tank includes a left-ear LNG low-temperature delivery pump 3, a right-ear low-temperature delivery pump 4 and a TCS control system 2, wherein the inlet of the left-ear LNG low-temperature delivery pump 3 is connected with a left-ear LNG low-temperature delivery pump suction pipe 5, and the inlet of the right-ear LNG low-temperature delivery pump 4 is connected with a right-ear LNG low-temperature delivery pump suction pipe 8, and the left-ear LNG low-temperature delivery pump suction pipe 5 and the right-ear LNG low-temperature delivery pump suction pipe 8 are connected through a connecting pipe 11, and the connecting point between the connecting pipe 11 and the left-ear LNG low-temperature delivery pump suction pipe 5 and the right-ear LNG low-temperature delivery pump suction pipe 8 is located above the inlets of the left-ear LNG low-temperature delivery pump suction pipe 5 and the right-ear LNG low-temperature delivery pump suction pipe 8; a connecting pipe isolation valve 12 is provided on the connecting pipe 11, and the connecting pipe isolation valve 12 is a fault-closing type remote control valve.

[0016] A left ear LNG cryogenic delivery pump suction valve 6 and a right ear LNG cryogenic delivery pump suction valve 9 are respectively provided on the left ear LNG cryogenic delivery pump suction pipe 5 and the right ear LNG cryogenic delivery pump suction pipe 8, and the left ear LNG cryogenic delivery pump suction valve 6 and the right ear LNG cryogenic delivery pump suction valve 9 are both fault-open type remote control valves; the connecting point between the connecting pipe 11 and the left ear LNG cryogenic delivery pump suction pipe 5 and the right ear LNG cryogenic delivery pump suction pipe 8 is located near the left ear LNG cryogenic delivery pump suction valve 6 and the right ear LNG cryogenic delivery pump suction valve 9. The inlet side of the LNG cryogenic delivery pump suction pipe 5 and the right ear LNG cryogenic delivery pump suction pipe 8; the left ear LNG cryogenic delivery pump suction pipe suction port and the right ear LNG cryogenic delivery pump suction pipe suction port 10 are respectively provided at the inlet of the left ear LNG cryogenic delivery pump suction pipe 5 and the right ear LNG cryogenic delivery pump suction pipe 8; the left ear LNG cryogenic delivery pump suction valve 6, the right ear LNG cryogenic delivery pump suction valve 9, the connecting pipe isolation valve 12, the left ear LNG cryogenic delivery pump 3 and the right ear cryogenic delivery pump 4 are all connected to the TCS control system 2 for telecommunication control.

[0017] Under normal use conditions, the left ear LNG cryogenic delivery pump suction valve 6 and the right ear LNG cryogenic delivery pump suction valve 9 remain in a normally open state, the connecting pipe isolation valve 12 remains in a normally closed state, and each pump sucks the LNG on the corresponding side. When one of the pumps fails, such as the left ear LNG cryogenic delivery pump 3 fails, and the liquid level is lower than the middle partition 13 of the LNG binaural storage tank, the right ear LNG cryogenic delivery pump 4 will not be able to extract the remaining LNG in the left ear. At this time, close the left ear LNG cryogenic delivery pump suction valve 6, open the left and right ear cryogenic delivery pump suction pipe connecting pipe isolation valve 12, and the right ear LNG cryogenic delivery pump 4 can smoothly extract the remaining LNG on both sides of the binaural tank. If the right ear LNG cryogenic delivery pump 4 fails and the liquid level is lower than the middle partition 13 of the LNG binaural storage tank, the left ear LNG cryogenic delivery pump 3 will not be able to extract the remaining LNG in the right ear. At this time, close the right ear LNG cryogenic delivery pump suction valve 9, open the left and right ear cryogenic delivery pump suction pipe connecting pipe isolation valve 12, then the left ear LNG cryogenic delivery pump 3 can smoothly extract the remaining LNG on both sides of the binaural tank.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low temperature transportation system for LNG binaural storage tanks, characterized in that: It comprises a left ear LNG cryogenic delivery pump and a right ear LNG cryogenic delivery pump, wherein the inlet of the left ear LNG cryogenic delivery pump is connected with a left ear LNG cryogenic delivery pump suction pipe, and the inlet of the right ear LNG cryogenic delivery pump is connected with a right ear LNG cryogenic delivery pump suction pipe, the left ear LNG cryogenic delivery pump suction pipe and the right ear LNG cryogenic delivery pump suction pipe are connected through a connecting pipe, and the connecting point between the connecting pipe and the left ear LNG cryogenic delivery pump suction pipe and the right ear LNG cryogenic delivery pump suction pipe is located above the inlets of the left ear LNG cryogenic delivery pump suction pipe and the right ear LNG cryogenic delivery pump suction pipe; a connecting pipe isolation valve is provided on the connecting pipe, and the connecting pipe isolation valve is a fault-closing type remote control valve.

2. The LNG binaural storage tank cryogenic transportation system according to claim 1 is characterized in that: A left ear LNG cryogenic transfer pump suction valve and a right ear LNG cryogenic transfer pump suction valve are respectively provided on the left ear LNG cryogenic transfer pump suction pipe and the right ear LNG cryogenic transfer pump suction pipe, and the connecting point between the connecting pipe and the left ear LNG cryogenic transfer pump suction pipe and the right ear LNG cryogenic transfer pump suction pipe is located on the inlet side of the left ear LNG cryogenic transfer pump suction valve and the right ear LNG cryogenic transfer pump suction valve close to the left ear LNG cryogenic transfer pump suction pipe and the right ear LNG cryogenic transfer pump suction pipe.

3. The LNG binaural storage tank cryogenic transportation system according to claim 2 is characterized in that: The left-ear LNG cryogenic transfer pump suction valve and the right-ear LNG cryogenic transfer pump suction valve are both fail-open type remote control valves.

4. The LNG binaural storage tank cryogenic transportation system according to claim 3 is characterized in that: A left ear LNG cryogenic delivery pump suction port and a right ear LNG cryogenic delivery pump suction port are respectively provided at the inlets of the left ear LNG cryogenic delivery pump suction port pipe and the right ear LNG cryogenic delivery pump suction port pipe.

5. The LNG binaural storage tank cryogenic transportation system according to claim 4 is characterized in that: The system also includes a control system, and the left ear LNG cryogenic delivery pump suction valve, the right ear LNG cryogenic delivery pump suction valve, the connecting pipe isolation valve, the left ear LNG cryogenic delivery pump and the right ear cryogenic delivery pump are all connected to the control system by telecommunication control.

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