阅读说明：本技术 一种燃气双壁管排水系统 (Gas double-wall pipe drainage system ) 是由 陈俊耿 李勇杰 许炜麟 于 2020-04-17 设计创作，主要内容包括：本发明公开了一种燃气双壁管排水系统,其包括燃气双壁管、泄放管和泄放罐,所述燃气双壁管包括外管和内管；于所述外管的各个管体折弯处的最低点处均连接一泄放管；且在所述外管与各泄放管的连接管段上均设有可燃气体探测装置；所述泄放管的出水口连接泄放罐的进水口；所述泄放罐的进水口处配合设有用于控制所述泄放罐的进水口开启或关闭的第一截止阀；所述泄放罐的底部设有泄放口,所述泄放口处配合设有用于控制泄放口开启或关闭的第二截止阀。本发明所述的燃气双壁管排水系统,可解决现有技术中冷凝水直接排放到机舱,当双壁管内外管之间有破损时,燃气也会有可能排放到机舱中,从而有引起火灾的危险的技术问题。(The invention discloses a gas double-wall pipe drainage system, which comprises a gas double-wall pipe, a discharge pipe and a discharge tank, wherein the gas double-wall pipe comprises an outer pipe and an inner pipe; a discharge pipe is connected to the lowest point of each bent pipe body of the outer pipe; and the connecting pipe sections of the outer pipe and each discharge pipe are provided with combustible gas detection devices; the water outlet of the discharge pipe is connected with the water inlet of the discharge tank; a first stop valve for controlling the opening or closing of the water inlet of the discharge tank is arranged at the water inlet of the discharge tank in a matched manner; the bottom of the discharge tank is provided with a discharge port, and the discharge port is provided with a second stop valve used for controlling the discharge port to be opened or closed in a matching manner. The gas double-wall pipe drainage system can solve the technical problems that condensed water is directly discharged to an engine room in the prior art, and when the inner pipe and the outer pipe of the double-wall pipe are damaged, gas can be possibly discharged to the engine room, so that fire hazards are caused.)

1. A gas double-walled pipe drainage system, comprising:

the gas double-wall pipe comprises an outer pipe and an inner pipe, and the gas inlet of the inner pipe is connected with a gas inlet; a discharge pipe is connected to the lowest point of each bent pipe body of the outer pipe; and the connecting pipe sections of the outer pipe and each discharge pipe are provided with combustible gas detection devices;

the water outlet of the discharge pipe is connected with the water inlet of the discharge tank;

the water inlet of the discharge tank is provided with a first stop valve in a matching manner 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, and the discharge port is matched with a second stop valve used for controlling the opening or closing of the discharge port.

2. The gas fired double walled pipe drainage system of claim 1, wherein a level switch is provided on the drain tank, the level switch being at a greater height from the bottom of the drain tank than the level switch is at the top of the drain tank.

3. The gas fired double walled pipe drainage system of claim 2, wherein a ratio of a height of the liquid level switch from a bottom of the blowdown tank to a height of the liquid level switch from a top of the blowdown tank is 9: 1.

4. The gas double-wall pipe drainage system according to claim 1, wherein a vent hole is formed in the top of the discharge tank, and a third stop valve for controlling the opening or closing of the vent hole is arranged at the vent hole in a matching manner.

5. The gas double-walled pipe drainage system of claim 1, wherein the tank body of the discharge tank is made of seamless steel pipe, a flange assembly is welded at the upper end of the discharge tank, and a water inlet of the discharge tank is arranged on the flange assembly.

6. A gas-fired double walled pipe drainage system as claimed in any one of claims 1 to 5, wherein the number of said discharge tanks corresponds to the number of said discharge pipes, the water outlet of one of said discharge pipes being connected to the water inlet of one of said discharge tanks.

7. A gas-fired double walled pipe drainage system as claimed in any one of claims 1 to 5, wherein the number of the drain tanks is one, and the water outlet of each of the drain pipes is connected to the water inlet of the drain tank.

Technical Field

The invention relates to the technical field of drainage systems, in particular to a gas double-wall pipe drainage system.

Background

The dual-fuel container ship usually selects fuel oil and fuel gas as fuel of a host machine, a main generator set and a boiler. International regulations on the construction and equipment of bulk transport liquefied gas vessels (IGC CODE) stipulate that when gas is used as fuel, the area inside the cabin requires the use of double-walled pipes as transfer lines, otherwise the cabin is defined as a hazardous area.

The double-wall pipe is provided with an inner pipe layer and an outer pipe layer, the medium of the inner pipe is fuel gas, and the temperature of the fuel gas entering the engine room is about 0 ℃. The outer tube medium is for coming from the outside air of boats and ships, and the outer union coupling air exhauster is in order to continuously take away the air of outer tube through the air exhauster to make double-walled pipe outer tube have certain negative pressure, fresh air is constantly inhaled from the outside, thereby drives outer tube air and continuously circulates. When gas leaks from the inner pipe to the outer pipe, it is carried out of the cabin by the continuously circulating air.

Because the air on the sea contains a large amount of water vapor, after the air enters the outer pipe of the double-wall pipe, the air is cooled by the low-temperature fuel gas in the inner pipe, and most of the water vapor is cooled into condensed water. If the condensed water is not discharged in time, the condensed water can be blocked in the pipeline, so that fresh air can not enter the double-wall pipe; however, if this condensate is discharged directly into the nacelle, there is a risk that, if there is a break between the inner and outer tubes of the double-walled tube, gas will be discharged into the nacelle, thereby causing a fire.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a gas double-walled pipe drainage system, which can solve the technical problems in the prior art that condensed water is directly discharged to a cabin, and when there is a damage between an inner pipe and an outer pipe of a double-walled pipe, gas may be discharged to the cabin, thereby causing a fire hazard.

In order to achieve the above object, the present invention provides a gas double-walled pipe drainage system, comprising:

the gas double-wall pipe comprises an outer pipe and an inner pipe, and the gas inlet of the inner pipe is connected with a gas inlet; a discharge pipe is connected to the lowest point of each bent pipe body of the outer pipe; and the connecting pipe sections of the outer pipe and each discharge pipe are provided with combustible gas detection devices;

the water outlet of the discharge pipe is connected with the water inlet of the discharge tank;

the water inlet of the discharge tank is provided with a first stop valve in a matching manner 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, and the discharge port is matched with a second stop valve used for controlling the opening or closing of the discharge port.

Further, a liquid level switch is arranged on the discharge tank, and the distance between the liquid level switch and the bottom of the discharge tank is larger than the distance between the liquid level switch and the top of the discharge tank.

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

Further, the top of the discharge tank is provided with a vent hole, and the vent hole is provided with a third stop valve for controlling the vent hole to be opened or closed in a matched manner.

Further, the tank body of the discharge tank is made of seamless steel pipes, a flange assembly is welded at the upper end of the discharge tank, and a water inlet of the discharge tank is arranged on the flange assembly.

Further, the number of the discharge tanks is the same as that of the discharge pipes, and the water outlet of one discharge pipe is connected to the water inlet of one discharge tank.

Further, the number of the discharge tanks is one, and the water outlet of each discharge pipe is connected to the water inlet of the discharge tank.

Compared with the prior art, the gas double-wall pipe drainage system provided by the invention has the following technical effects:

the gas double-wall pipe comprises an outer pipe and an inner pipe, and a gas inlet of the inner pipe is connected with a gas inlet; a discharge pipe is connected to the lowest point of each bent pipe body of the outer pipe; the water outlet of the discharge pipe is connected with the water inlet of the discharge tank; a first stop valve for controlling the opening or closing of the water inlet of the discharge tank is arranged at the water inlet of the discharge tank in a matched manner; therefore, the first stop valve can be controlled to be kept in an open state, so that the condensed water in the outer pipe can be directly discharged into the discharge tank, and the condensed water is prevented from blocking the outer pipe.

Meanwhile, combustible gas detection devices are arranged on the connecting pipe sections of the outer pipe and the discharge pipes; a discharge port is formed in the bottom of the discharge tank, and a second stop valve used for controlling the opening or closing of the discharge port is arranged at the discharge port in a matched mode; therefore, before the second stop valve is opened to discharge the condensed water in the discharge tank to a cabin sewage well, whether the combustible gas detection device triggers an alarm reaction is firstly confirmed, if the alarm reaction occurs, the air inlet of the inner pipe is firstly closed, meanwhile, an exhaust fan connected with the outer pipe is controlled to extract the gas in the outer pipe, and then the gas double-wall pipe is detected and maintained until the combustible gas detection device does not trigger the alarm reaction any more; if the alarm reaction does not occur, the first stop valve is closed to cut off the passage between the discharge tank and the gas double-wall pipe, and then the second stop valve is opened to discharge the condensed water to a cabin sewage well; thereby at the tank sluicing in-process of releasing, can effectively avoid the gas to get into the cabin inside, the risk that greatly reduced conflagration took place.

Drawings

FIG. 1 is a schematic structural diagram of a gas double-walled pipe drainage system according to a first embodiment of the present invention;

FIG. 2 is a first schematic structural diagram of a discharge tank of the gas double-walled pipe drainage system according to the present invention;

FIG. 3 is a second structural diagram of a discharge tank of the gas double-walled pipe drainage system according to the present invention;

FIG. 4 is a third schematic structural view of a discharge tank of the gas double-walled pipe drainage system according to the present invention;

fig. 5 is a schematic structural view of a gas double-walled pipe drainage system according to a second embodiment of the present invention.

The gas-liquid separator comprises a gas double-wall pipe 1, a gas double-wall pipe 11, an outer pipe 12, an inner pipe 2, a discharge pipe 3, a discharge tank 31, a water inlet 32, a first stop valve 33, a discharge opening 34, a second stop valve 35, a liquid level switch mounting opening 36, a ventilation opening 37, a third stop valve 4, a combustible gas detection device 5, a flange assembly 6, a liquid level switch 7, a main engine gas valve group 8, a dual-fuel main engine 9 and an exhaust fan.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.