WO2021208504A1

WO2021208504A1 - Fuel gas double-wall pipe drainage system

Info

Publication number: WO2021208504A1
Application number: PCT/CN2020/140262
Authority: WO
Inventors: 陈俊耿; 李勇杰; 许炜麟
Original assignee: 中船黄埔文冲船舶有限公司; 广州文冲船厂有限责任公司
Priority date: 2020-04-17
Filing date: 2020-12-28
Publication date: 2021-10-21
Also published as: CN111609313A

Abstract

Disclosed is a fuel gas double-wall pipe (1) drainage system, comprising a fuel gas double-wall pipe (1), discharge pipes (2) and a discharge tank (3). The fuel gas double-wall pipe (1) comprises an outer pipe (11) and an inner pipe (12); a discharge pipe (2) is connected at the lowest point of each pipe body bent part of the outer pipe (11); combustible gas detection devices (4) are arranged on the connecting pipe sections between the outer pipe (11) and the discharge pipes (2); water outlets of the discharge pipes (2) are connected to a water inlet (31) of the discharge tank (3); a first stop valve (32) for controlling the opening or closing of the water inlet (31) of the discharge tank (3) is arranged at the water inlet (31) of the discharge tank (3) in a cooperative manner; a discharge port (33) is provided in the bottom of the discharge tank (3); and a second stop valve (34) for controlling the discharge port (33) to be opened or closed is arranged at the discharge port (33) in a cooperative manner. The fuel gas double-wall pipe (1) drainage system can solve the technical problems that condensed water is directly discharged to a cabin, and that when the space between the inner pipe and the outer pipe of the double-wall pipe (1) is damaged, fuel gas may possibly be discharged into the cabin, such that a fire hazard is caused.

Description

Gas double-wall pipe drainage system

This application claims the priority of the Chinese patent application whose application date is April 17, 2020 and the application number is 202010303976.1. The entire content of this application is incorporated into this application by reference.

Technical field

This application relates to the technical field of drainage systems, for example, to a gas double-wall pipe drainage system.

Background technique

Dual-fuel container ships usually choose oil and gas as the fuel for the main engine, main generator set and boiler. The International Code for the Construction and Equipment of Ships Carrying Liquefied Gas in Bulk (IGC CODE) stipulates that when gas is used as fuel, the area in the engine room needs to use double-walled pipes as the transmission pipeline, otherwise the engine room will be defined as a hazardous area.

The double-walled pipe has two layers: an inner pipe and an outer pipe. The medium of the inner pipe is fuel gas, and the temperature of the fuel gas entering the engine room is about 0°C. The medium of the outer pipe is the air from the outside of the ship. The outer pipe is connected to the exhaust fan to continuously draw the air from the outer pipe through the exhaust fan, so that the double-wall pipe outer pipe has a certain negative pressure, and fresh air is continuously sucked in from the outside. Drive the continuous air circulation of the outer tube. When gas leaks from the inner pipe to the outer pipe, the gas is carried out of the engine room by the continuously circulating air.

Since the sea air contains a large amount of water vapor, when the air enters the outer pipe of the double-walled pipe, it is cooled by the low-temperature gas of the inner pipe, and most of the water vapor is cooled into condensed water. If the condensate is not discharged in time, it will be blocked in the pipeline, and the fresh air cannot enter the double-walled pipe; but if the condensate is directly discharged into the engine room, when there is damage between the inner and outer pipes of the double-walled pipe, the gas will also be damaged. It may be discharged into the engine room, which may cause a fire hazard.

Summary of the invention

This application provides a gas double-wall pipe drainage system, which can solve the problem of direct discharge of condensate into the engine room in related technologies. When there is damage between the inner and outer pipes of the double-wall pipe, the gas may also be discharged into the engine room, which may cause a fire. The dangerous technical problem.

A gas double-wall pipe drainage system provided by this application includes:

A gas double-wall pipe, the gas double-wall pipe includes an outer pipe and an inner pipe, the gas inlet of the inner pipe is connected to the gas inlet; the outer pipe is connected at the lowest point of each pipe body bend A discharge pipe; and a combustible gas detection device is provided on the connecting pipe section of the outer pipe and each of the discharge pipes;

A discharge pipe, the water outlet of the discharge pipe is connected to the water inlet of the discharge tank;

A discharge tank, the water inlet of the discharge tank is matched with a first shut-off valve for controlling the opening or closing of the water inlet of the discharge tank; the bottom of the discharge tank is provided with a discharge port, the The relief port is matched with a second shut-off valve for controlling the opening or closing of the relief port.

Optionally, a liquid level switch is provided on the relief tank, and the height of the liquid level switch from the bottom of the relief tank is greater than the height of the liquid level switch from the top of the relief tank.

Optionally, the ratio of the height of the liquid level switch from the bottom of the relief tank to the height of the liquid level switch from the top of the relief tank is 9:1.

Optionally, a vent is provided on the top of the relief tank, and a third shut-off valve for controlling the opening or closing of the vent is fitted at the vent.

Optionally, the tank body of the discharge tank is made of seamless steel pipes, the upper end of the discharge tank is welded with a flange assembly, and the water inlet of the discharge tank is provided on the flange assembly.

Optionally, the number of the relief tanks is the same as the number of the relief pipes, and the water outlet of one relief pipe is connected to the water inlet of the relief tank.

Optionally, the number of the relief tank is one, and the water outlet of each relief pipe is connected to the water inlet of the relief tank.

A gas double-wall pipe drainage system provided by this application:

The gas double-wall pipe is designed to include an outer pipe and an inner pipe. The gas inlet of the inner pipe is connected to the gas inlet; the lowest point of each pipe body bend of the outer pipe is connected to a discharge The water outlet of the discharge pipe is connected to the water inlet of the discharge tank; the water inlet of the discharge tank is matched with a first shut-off valve for controlling the opening or closing of the water inlet of the discharge tank; By controlling the first shut-off valve to remain open, the condensed water in the outer pipe can be directly discharged into the drain tank, so that the condensed water avoids blocking the outer pipe.

At the same time, a combustible gas detection device is provided on the connecting pipe section of the outer pipe and each of the relief pipes; the bottom of the relief tank is provided with a relief port, and the relief port is matched with a control device. The second shut-off valve that the discharge port is opened or closed; in this way, before opening the second shut-off valve to discharge the condensate in the discharge tank to the engine room sewage well, first confirm the detection of the combustible gas Whether the device triggers an alarm response, if an alarm response occurs, first close the air inlet of the inner pipe, and at the same time control the exhaust fan connected with the outer pipe to draw out the gas in the outer pipe, and then perform the gas double-wall pipe Detect and maintain until the combustible gas detection device no longer triggers an alarm response; if no alarm response occurs, first close the first shut-off valve to cut off the passage between the discharge tank and the gas double-wall pipe, Then open the second shut-off valve to let the condensate drain to the sewage well of the engine room; thus, during the process of draining the water from the drain tank, the gas can be effectively prevented from entering the engine room, thereby reducing the risk of fire.

Description of the drawings

FIG. 1 is a schematic structural diagram of a gas double-wall pipe drainage system in Embodiment 1 of the application;

Figure 2 is a structural schematic diagram 1 of the discharge tank of the gas double-wall pipe drainage system described in this application;

Fig. 3 is a second structural schematic diagram of the discharge tank of the gas double-wall pipe drainage system described in this application;

4 is the third structural diagram of the discharge tank of the gas double-wall pipe drainage system described in this application;

Fig. 5 is a schematic structural diagram of a gas double-wall pipe drainage system in the second embodiment of the application.

Among them, 1. Gas double-wall pipe, 11, outer pipe, 12, inner pipe, 2, relief pipe, 3. relief tank, 31, water inlet, 32, first stop valve, 33, relief port, 34 , The second shut-off valve, 35, the installation port of the liquid level switch, 36, the ventilation port, 37, the third shut-off valve, 4. The combustible gas detection device, 5. The flange assembly, 6. The liquid level switch, 7. The main engine gas valve Group, 8. Dual fuel main engine, 9. Exhaust fan.

Detailed ways

In the description of this application, it should be noted that the terms "center", "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying The description does not indicate or imply that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood under specific circumstances.

Example one

As shown in Figures 1 to 4, the gas double-wall pipe 1 drainage system according to the embodiment of the present application includes a gas double-wall pipe 1, and the gas double-wall pipe 1 is arranged in sequence from the upstream to the downstream direction. The main engine gas valve group 7 and the dual-fuel main engine 8, the air outlet of the main engine gas valve group 7 and the air outlet of the dual-fuel main engine 8 are all connected to the exhaust fan 9 through a ventilation pipe; the gas double-wall pipe 1 includes an outer pipe 11 and an inner pipe. Tube 12, the air inlet of the inner tube 12 is connected to the gas inlet; the lowest point of each bend of the outer tube 11 is connected to a relief tube 2; and the outer tube 11 A combustible gas detection device 4 is provided on the connecting pipe section with each of the relief pipes 2.

A drain pipe 2, the water outlet of the drain pipe 2 is connected to the water inlet 31 of the drain tank 3.

The discharge tank 3, the water inlet 31 of the discharge tank 3 is matched with a first shut-off valve 32 for controlling the opening or closing of the water inlet 31 of the discharge tank 3; the bottom of the discharge tank 3 is provided There is a relief port 33, and the relief port 33 is matched with a second shut-off valve 34 for controlling the opening or closing of the relief port 33.

By designing the gas double-wall pipe 1 to include an outer pipe 11 and an inner pipe 12, the gas inlet of the inner pipe 12 is connected to the gas inlet; at the lowest point of each bend of the outer pipe 11 Are connected to a discharge pipe 2; the water outlet of the discharge pipe 2 is connected to the water inlet 31 of the discharge tank 3; The first shut-off valve 32 with the water inlet 31 opened or closed; in this way, the first shut-off valve 32 can be controlled to remain open, so that the condensed water in the outer pipe 11 can be directly discharged into the drain tank 3, thereby The condensed water avoids blocking the outer tube 11.

At the same time, a combustible gas detection device 4 is provided on the connecting pipe section of the outer pipe 11 and each of the relief pipes 2; the bottom of the relief tank 3 is provided with a relief port 33, the relief port 33 A second shut-off valve 34 for controlling the opening or closing of the discharge port 33 is fitted in place; in this way, the second shut-off valve 34 is opened to discharge the condensate in the discharge tank 3 to the engine room sewage Before drilling the well, first confirm whether the combustible gas detection device 4 triggers an alarm response. If an alarm response occurs, first close the air inlet of the inner tube 12, and at the same time control the exhaust fan 9 connected to the outer tube 11 The gas in the pipe 11 is drawn out, and then the gas double-wall pipe 1 is detected and maintained until the combustible gas detection device 4 no longer triggers the alarm response; if the alarm response does not occur, the first shut-off valve 32 Close to cut off the passage between the discharge tank 3 and the gas double-wall pipe 1, and then open the second shut-off valve 34 to allow the condensate to be discharged to the engine room sewage well; thereby, the discharge tank 3 During the process, it can effectively prevent the gas from entering the engine room and reduce the risk of fire.

In the embodiment of the present application, the inner diameter of the discharge pipe 2 is smaller than the inner diameter of the outer pipe 11 of the gas double-wall pipe 1 to avoid damaging the air circulation route of the outer pipe 11 of the gas double-wall pipe 1. The combustible gas detection device 4 is used to detect the occurrence of gas leakage in the gas double-wall pipe 1.

Further, please refer to Figures 1 to 4, as a specific implementation of the gas double-wall pipe 1 drainage system provided by the present application, a liquid level switch installation port 35 is provided on the side wall of the relief tank 3, so A liquid level switch 6 is installed on the liquid level switch installation port 35, and the height of the liquid level switch 6 from the bottom of the drain tank 3 is greater than the height of the liquid level switch 6 from the top of the drain tank 3 . In this way, the amount of condensed water in the drain tank 3 can be monitored through the liquid level switch 6, and when the condensate in the drain tank 3 accumulates to trigger the level switch 6 to issue a high alarm, the first The shut-off valve 32 and the second shut-off valve 34 are simultaneously opened to discharge the condensed water in the discharge tank 3 to the engine room sewage well.

Further, please refer to Figures 1 to 3, as a specific implementation of the gas double-wall pipe 1 drainage system provided in this application, the height of the liquid level switch 6 from the bottom of the drain tank 3 is equal to the height of the The height ratio between the liquid level switch 6 and the top of the relief tank 3 is 9:1.

It should be noted that the setting position of the liquid level switch 6 can be adjusted and set according to actual use needs, which is not specifically limited here.

In order to promote the drainage of the discharge port 33 and reduce the working time of the crew, please further refer to Figs. A vent 36 is provided on the top, and a third shut-off valve 37 for controlling the opening or closing of the vent 36 is matched with the vent 36. The third shut-off valve 37 is generally closed. Only when the second shut-off valve 34 is opened, the third shut-off valve 37 is opened at the same time to help drain water. When the condensate in the drain tank 3 is drained, the second stop valve 34 and the third stop valve 37 are closed at the same time, and then the first stop valve 32 is opened. The newly generated condensate water can continue to be discharged into the discharge tank 3 again.

Further, please refer to Figures 1 to 3, as a specific implementation of the gas double-wall pipe 1 drainage system provided in this application, the discharge tank 3 includes a tank body, which is made of seamless steel pipes. It can be fixed on the bulkhead or column with pipe clamps, saving the occupied space; the flange assembly 5 includes a first flange and a blind flange. In order to facilitate disassembly and inspection, the lower end of the discharge tank 3 is welded and sealed The plate, the upper welding flange, and the flange and the blind plate flange are locked and sealed with bolts. When disassembly and inspection are required, the bolts can be unscrewed. The water inlet 31 of the drain tank 3 is provided on the blind flange.

Further, please refer to FIG. 1, as a specific implementation of the gas double-wall pipe 1 drainage system provided by the present application, the number of the discharge tanks 3 is the same as the number of the discharge pipes 2, and one The water outlet of the discharge pipe 2 is connected to the water inlet 31 of one of the discharge tanks 3.

Example two

As shown in Figure 5, the difference between the gas double-wall pipe 1 drainage system provided by this embodiment and the first embodiment is that: the number of the discharge tank 3 is one, and the water outlet of each discharge pipe 2 is equal to Connected to the water inlet 31 of the drain tank 3.

In summary, in the drainage system of the gas double-wall pipe 1 described in the present application, the first shut-off valve 32 can be controlled to be kept open, so that the condensed water in the outer pipe 11 can be directly discharged into the drain tank 3. In this way, the condensed water avoids blocking the outer pipe 11; in addition, before opening the second shut-off valve 34 to discharge the condensed water in the drain tank 3 to the engine room sewage well, first confirm whether the combustible gas detection device 4 The alarm reaction is triggered. If an alarm reaction occurs, the air inlet of the inner tube 12 is closed first, and the exhaust fan 9 connected to the outer tube 11 is controlled to extract the gas in the outer tube 11, and then the gas The wall pipe 1 is checked and maintained until the combustible gas detection device 4 no longer triggers the alarm reaction; if no alarm reaction occurs, the first shut-off valve 32 is closed first to cut off the discharge tank 3 and the The passage of the gas double-wall pipe 1, and then open the second shut-off valve 34 to let the condensate drain to the engine room bilge well; thus, during the process of draining the drain tank 3, it can effectively prevent the gas from entering the engine room and reduce the fire The risks that occur.

Claims

A gas double-wall pipe drainage system, including:

A gas double-wall pipe, the gas double-wall pipe includes an outer pipe and an inner pipe, the gas inlet of the inner pipe is connected to the gas inlet; the outer pipe is connected at the lowest point of each pipe body bend A discharge pipe; and a combustible gas detection device is provided on the connecting pipe section of the outer pipe and each of the discharge pipes;

A discharge pipe, the water outlet of the discharge pipe is connected to the water inlet of the discharge tank;

A discharge tank, the water inlet of the discharge tank is matched with a first shut-off valve for controlling the opening or closing of the water inlet of the discharge tank; the bottom of the discharge tank is provided with a discharge port, the The relief port is matched with a second shut-off valve for controlling the opening or closing of the relief port.
The gas double-wall pipe drainage system according to claim 1, wherein a liquid level switch is provided on the discharge tank, and the height of the liquid level switch from the bottom of the discharge tank is greater than the distance from the liquid level switch The height of the top of the relief tank.
The gas double-wall pipe drainage system according to claim 2, wherein the ratio of the height of the liquid level switch from the bottom of the relief tank to the height of the liquid level switch from the top of the relief tank is 9 ︰1.
The gas double-wall pipe drainage system according to claim 1, wherein the top of the discharge tank is provided with a vent, and the vent is matched with a third shut-off valve for controlling the opening or closing of the vent .
The gas double-wall pipe drainage system according to claim 1, wherein the tank body of the discharge tank is made of seamless steel pipe, the upper end of the discharge tank is welded with a flange assembly, and the water inlet of the discharge tank is Set on the flange assembly.
The gas double-wall pipe drainage system according to any one of claims 1 to 5, wherein the number of the relief tanks is the same as the number of the relief pipes, and the water outlet of one relief pipe is connected to one The water inlet of the drain tank.
The gas double-wall pipe drainage system according to any one of claims 1 to 5, wherein the number of the discharge tank is one, and the water outlet of each discharge pipe is connected to the discharge tank. water intake.