Liquefied natural gas (LNG) power ship fuel gas ventilation mast release system

Abstract

The utility model discloses an LNG (Liquefied Natural Gas) power ship fuel gas ventilation mast release system, which is characterized in that a closed release system is constructed on a mast of a ventilation mast to release condensed water and gas generated in the ventilation process of the LNG power ship ventilation mast. Meanwhile, in the process of discharging condensate water and gas, the gas can be monitored through the gas detection device, the situation that combustible gas is directly discharged to the ship bow to form a dangerous area is avoided, safety is improved, and potential risks are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to shipbuilding technical field especially relates to a kind of LNG power ship gas venting mast venting system. BACKGROUND

[0002] In the face of the fierce ship market competition of shipping industry and increasingly stringent emission requirements, LNG power ship with clean and low carbon as target has become the primary choice of more and more shipowners. However, with LNG power ship gas supply system, not only clean and low carbon, but also ship dangerous gas emission problem.

[0003] At present, LNG power ship gas venting mast is generally common gas venting mast, mainly including pipe type, truss type and bow mast as venting mast 3 types, arranged in the bow region of LNG power ship. The ship that stores liquefied natural gas usually installs venting mast to discharge natural gas or nitrogen discharged from LNG storage cabin safety valve or insulating layer safety valve. Thus the temperature of LNG storage cabin venting pipe outlet is usually low, and a certain range of dangerous area is generated nearby, resulting in safety hazard of conventional relief valve in the process of relief. SUMMARY

[0004] Therefore, the utility model provides a kind of LNG power ship gas venting mast venting system to solve the problems in the above background art.

[0005] A kind of LNG power ship gas venting mast venting system, including the venting valve valve box of being set in the upper portion of venting mast mast and covering venting mast relief valve, gas detection device being set in the top of venting valve valve box, and the relief material storage tank being set in venting valve valve box, the relief material storage tank is connected with the outlet of venting mast relief valve, relief material storage tank is provided with liquid level meter for detecting the liquid level in its tank, the lower part of relief material storage tank is connected with liquid discharge pipe, liquid discharge pipe extends out of venting valve valve box, the upper part of relief material storage tank is connected with gas discharge pipe, the liquid level meter and the pipeline switch of liquid discharge pipe and gas discharge pipe realize linkage, gas discharge pipe is connected with the gas inlet of gas detection device.

[0006] Preferably, the venting valve valve box is provided with a visual window.

[0007] Preferably, the liquid level meter is fixed on the outer side of the relief material storage tank by a fixing bracket.

[0008] Preferably, the pipe section of the liquid discharge pipe and the gas discharge pipe in the venting valve valve box is provided with a control valve for controlling the pipeline switch.

[0009] Preferably, the pipe section of the liquid discharge pipe extending out of the venting valve valve box is further provided with a control switch.

[0010] Preferably, the control switch is arranged at the connection of the liquid discharge pipe and the valve box of the blow-off valve.

[0011] Preferably, the air breather mast is an air breather mast arranged at the bow of the ship.

[0012] The utility model discloses the beneficial effect is:

[0013] The application constructs a closed blow-off system on the mast of the air breather mast to blow off the condensate and gas generated in the air breather process of the LNG power ship air breather mast, and the gas detection device can monitor the gas in the process of blowing off the condensate and gas, avoid the combustible gas directly blowing off to the bow of the ship to form a dangerous area, improve the safety, solve the potential risk, and also can sample the gas in the gas emission process of the air breather mast, which is beneficial to the analysis and control of the released gas in the LNG transportation and filling process of the crew. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawings needed in the embodiment will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.

[0015] Figure 1 It is the structure diagram of LNG power ship gas air breather mast blow-off system.

[0016] Figure 2 It is the front view of LNG power ship gas air breather mast blow-off system.

[0017] Figure 3 It is the top view of LNG power ship gas air breather mast blow-off system.

[0018] The meaning of the reference numerals in the drawing is:

[0019] 1 is the air breather mast, 2 is the valve box of the blow-off valve, 3 is the blow-off material storage tank, 4 is the air breather mast blow-off valve, 5 is the visual window, 6 is the gas detection device, 7 is the gas discharge pipe, 8 is the liquid discharge pipe, 9 is the control switch, 10 is the fixed support, 11 is the liquid level meter. DETAILED DESCRIPTION

[0020] For the purpose, technical scheme and advantages of the utility model to be clearer and more obvious, the following specific embodiments shown in the drawings are used to describe the utility model. However, it should be understood that these descriptions are only exemplary and not to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0021] The terms used in the present disclosure are merely for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "said" and "the" used in the present disclosure and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0022] In order to better understand the technical scheme of the utility model, the utility model is described in detail below in combination with the drawings.

[0023] The utility model provides a kind of LNG power ship gas venting mast release system, including the release valve valve box 2 being set in the upper portion of venting mast 1 mast and covering venting mast release valve 4, gas detection device 6 being set in the top of release valve valve box 2, and release storage tank 3 being set in release valve valve box 2.

[0024] Venting mast 1 is used to discharge natural gas or nitrogen discharged by LNG storage cabin safety valve or insulating layer safety valve during the operation of ship, to ensure the safety in LNG storage cabin transportation and storage, venting mast release valve 4 is installed in the end of venting mast 1 mast, and the outlet of venting mast release valve is connected with release storage tank 3 through pipeline, venting mast release valve 4 is used to release gas impurities with condensate water discharged by venting mast, gas impurities with condensate water released by venting mast release valve 4 can be stored in release storage tank 3, and gas impurities with condensate water enter gas-liquid separation in release storage tank 3, liquid is deposited in the lower portion of release storage tank 3, and gas is accumulated in the upper portion of release storage tank 3.

[0025] Venting mast release valve 4 and release storage tank 3 are located in the interior of release valve valve box 2, in the embodiment, release valve valve box 2 is a cubic steel box body. Liquid level meter 11 for detecting the liquid level of condensate liquid in the tank of release storage tank 3 is arranged on release storage tank 3, liquid discharge pipe 8 is connected to the lower portion of release storage tank 3, liquid discharge pipe 8 extends out of release valve valve box 2, and gas discharge pipe 7 is connected to the upper portion of release storage tank 3. The pipeline switch of liquid level meter 11, liquid discharge pipe 8 and gas discharge pipe 7 realizes linkage, and when the liquid level in release storage tank 3 is too high or too low, the switch of liquid discharge pipe 8 and gas discharge pipe 7 can be controlled correspondingly.

[0026] The lowest liquid level of the relief storage tank 3 should be higher than the height of the liquid discharge pipe 8. Preferably, the liquid discharge pipe 8 can be arranged at the bottom of the relief storage tank 3, so that the lowest liquid level in the relief storage tank 3 is higher than the liquid discharge port. When the gas-liquid separation is achieved, the gas is prevented from being discharged from the bottom of the relief storage tank 3. Control valves are arranged on the pipe sections of the liquid discharge pipe 8 and the gas discharge pipe 7 in the relief valve tank 2 to control the opening and closing of the pipes. When the control valve on the liquid discharge pipe 8 is opened, the condensed liquid can be discharged. When the control valve on the gas discharge pipe 7 is opened, the gas detection and gas discharge can be achieved.

[0027] The gas discharge pipe 7 is connected to the gas inlet of the gas detection device 6. When the gas in the relief storage tank 3 is discharged to the outside atmosphere through the gas discharge pipe 7, the gas passes through the gas detection device 6. The gas detection device 6 can detect the concentrations of natural gas, oxygen and other gases in the gas. When the concentration of the combustible gas reaches the set alarm value, an alarm signal can be sent to remind the safety officer to operate.

[0028] Preferably, in order to facilitate the observation of the liquid level height of the condensed liquid in the relief storage tank 3, the valve opening degree of the control valves on the liquid discharge pipe 8 and the gas discharge pipe 7 is controlled, so as to control the tank pressure of the relief storage tank 3. A visual window 5 is further arranged on the relief valve tank 2.

[0029] Preferably, the liquid level meter 11 is fixed on the outer side of the relief storage tank 3 through the fixing support 10.

[0030] In the embodiment, the gas vent mast 1 is a gas vent mast arranged at the bow of the ship. The system of the application is installed on the gas vent mast at the bow of the ship. Since the exhaust amount during the exhaust process of the gas vent mast is non-uniform, sometimes the exhaust amount is large and sometimes the exhaust amount is small. For safety consideration, in order to prevent the gas from being flushed out of the liquid discharge port of the relief storage tank 3 into the liquid discharge pipe 8 at a certain moment, a control switch 9 is further arranged on the pipe section of the liquid discharge pipe 8 extending out of the relief valve tank 2. The control switch 9 can be used as an emergency shutdown device to perform emergency shutdown when gas leakage occurs. Preferably, the control switch 9 is arranged at the connection between the liquid discharge pipe 8 and the relief valve tank 2.

[0031] The relief method based on the LNG-powered ship gas vent mast relief system includes the following steps:

[0032] S1, when the gas vent mast of the LNG-powered ship is in a relief preparation state, all the valves and switches are in a closed state, i.e., the initial state of all the valves and switches is a closed state;

[0033] The venting mast discharges gas through the venting mast release valve 4 into the release storage tank 3, and the water vapor in the gas is condensed and liquefied on the ice-cold tank wall of the release storage tank 3, the condensed liquid is deposited in the lower part of the release storage tank 3, and the gas is accumulated upward in the upper part of the release storage tank 3, so that the gas discharged by the venting mast 1 is separated into gas and liquid in the release storage tank 3;

[0034] S2, when the liquid level in the release storage tank 3 is lower than the set minimum liquid level, the liquid discharge pipe 8 and the gas discharge pipe 7 are kept closed to make the liquid level in the release storage tank 3 continue to rise;

[0035] S3, when the liquid level in the release storage tank 3 rises to exceed the liquid inlet of the liquid discharge pipe 8, the control valve on the gas discharge pipe 7 is opened, the gas detection device 6 starts to work, detects the impurities and combustible gas concentration in the discharged gas, and displays the content index of each gas component through the gas monitoring display screen, when the gas detected by the gas detection device 6 reaches the discharge standard, the gas discharge pipe 7 discharges the gas to the outside atmosphere;

[0036] S4, when the liquid level in the release storage tank 3 rises to the set higher liquid level, the control valve on the liquid discharge pipe 8 is slowly opened, and the valve opening degree of the control valve on the liquid discharge pipe 8 is adjusted to make the gas discharge rate at the upper end and the liquid discharge rate at the lower end reach dynamic balance.

[0037] It should be clear that the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

Claims

1. An LNG powered marine vessel gas venting mast venting system, characterized by, The venting valve tank (2) is arranged at the upper part of the mast of the vent mast (1) and covers the vent mast vent valve (4), the gas detection device (6) is arranged at the top of the venting valve tank (2), and the venting storage tank (3) is arranged in the venting valve tank (2), the venting storage tank (3) is connected with the outlet of the vent mast vent valve (4), the liquid level meter (11) for detecting the liquid level in the tank of the venting storage tank (3) is arranged on the venting storage tank (3), the lower part of the venting storage tank (3) is connected with the liquid discharge pipe (8), the liquid discharge pipe (8) extends out of the venting valve tank (2), the upper part of the venting storage tank (3) is connected with the gas discharge pipe (7), the liquid level meter (11) is connected with the pipeline switch of the liquid discharge pipe (8) and the gas discharge pipe (7) to realize linkage, and the gas discharge pipe (7) is connected with the gas inlet of the gas detection device (6).

2. The LNG powered marine vessel gas venting mast venting system of claim 1, wherein, The venting valve tank (2) is provided with a visual window (5).

3. The LNG powered marine vessel gas venting mast venting system of claim 1, wherein, The liquid level meter (11) is fixed on the outer side of the venting storage tank (3) through the fixing support (10).

4. The LNG powered marine vessel gas venting mast venting system of claim 1, wherein, The pipe sections of the liquid discharge pipe (8) and the gas discharge pipe (7) in the venting valve tank (2) are both provided with control valves for controlling the pipeline switches.

5. The LNG powered ship gas venting mast venting system according to claim 1 or 4, characterized in that, The pipe section of the liquid discharge pipe (8) extending out of the venting valve tank (2) is further provided with a control switch (9).

6. The LNG powered marine vessel gas venting mast venting system of claim 5, wherein, The control switch (9) is arranged at the connection between the liquid discharge pipe (8) and the venting valve tank (2).

7. The LNG powered marine vessel gas venting mast venting system of claim 1, wherein, The vent mast (1) is a vent mast arranged at the bow of a ship.

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