KR101058528B1 - Gas Vessel Explosion Proof Device - Google Patents

Abstract

The present invention relates to a gas container explosion prevention device, and more particularly, to a gas container explosion prevention device for preventing the gas container provided with a temperature-sensitive pressure safety device (TPRD) to be exploded by a local flame. An apparatus for preventing explosion of a gas container according to the present invention comprises: an inner housing surrounding the gas container and having through openings arranged on a surface thereof; And an outer housing surrounding the inner housing while being spaced apart from the inner housing and having through openings arranged on a surface thereof, the flame being blocked by the inner housing and the outer housing, so that the flame is directly transmitted to the gas container. Instead, the heat transferred through the through openings may be transferred through convection to the temperature sensitive pressure safety device.

TPRD, gas container, housing

Description

Explosion Proof Device for Gas Containers {AN APPARATUS FOR PREVENTING THE EXPLOSION OF FUEL STORAGE CYLINDER}

The present invention relates to a gas container explosion protection device, in particular, a gas container of a composite material (resin + carbon fiber or resin + glass fiber), equipped with a temperature-sensitive pressure safety device (TPRD) is exploded by a local flame It relates to a gas container explosion prevention device for preventing.

Natural gas vehicles are compressed natural gas (CNG) vehicles that use compressed natural gas as fuel, and liquefied natural gas (LNG) vehicles that use liquefied natural gas, depending on the type of fuel used. Adsorption natural gas (ANG) vehicles used for adsorption and storage.

Natural gas buses are also called Compressed Natural Gas Buses because they mainly use compressed natural gas. Compressed natural gas is used as a raw material, so compared with conventional diesel vehicles, there is no smoke or fine dust and noise is generated at half level. Nitrogen oxides, which make ozone, account for 37% of diesel vehicles and 41% and 16% of carbon monoxide and hydrocarbons. Natural gas buses generate only one-tenth of the air pollution compared to conventional diesel buses, and they also offer higher safety for compressed natural gas as a fuel.

The basic structure of a natural gas bus is the same as that of a conventional car such as a diesel bus, and only the fuel system is different. The natural gas, which is a fuel, is compressed at a high pressure (200 kg / cm 2) and stored in a gas container. The compressed gas is decompressed to a working pressure in a pressure reducing valve through a fuel pipe from the container, and then mixed with air and supplied into the engine.

With the growing interest in the environment, such as air pollution, natural gas buses are increasing worldwide. In Korea, the company completed the development of automobiles using natural gas as a fuel from 1991 to 1997. Since July 1998, four natural gas buses have been piloted in Incheon and Ansan. It operated 15 natural gas buses. As a result of the trial operation, there was no smoke and the ride comfort was well received by the passengers. In the future, city buses of major cities nationwide will be replaced by natural gas buses.

In general, the composite container used as a compressed natural gas container has a structure in which a thick layer of carbon fiber is impregnated with resin to withstand the pressure inside the container, and when the composite container is directly exposed to flame, epoxy, which is a resin, is about 300 ° C. As the carbonization above, the strength of the carbon fiber layer is sharply weakened, so that the carbon fiber layer cannot withstand internal pressure and explodes.

Thermally-activated pressure relief device (TPRD) is installed in the composite container, and serves to prevent explosion of the container by releasing the durable gas during the exposure of the flame.

However, as shown in Fig. 1, when the flame locally heats the composite container far from the position where the temperature sensitive pressure safety device is installed, due to the characteristics of the composite material, heat transfer is not made quickly. In addition, even if a fire occurs outside the composite container, the temperature-sensitive pressure safety device does not operate, causing an explosion accident due to an increase in the pressure inside the composite container.

A first object of the gas container explosion prevention device according to the present invention is to smoothly induce heat transfer when a local flame acts on a gas container in which a temperature sensitive pressure safety device is installed. To make it work.

A second object of the gas container explosion prevention device according to the present invention is to prevent external flames from being directly transferred to the composite material container.

Gas container explosion prevention device according to the present invention for achieving the above object, the inner housing surrounding the gas container, the through openings are arranged on the surface; And an outer housing surrounding the inner housing while being spaced apart from the inner housing and having through openings arranged on a surface thereof, the flame being blocked by the inner housing and the outer housing, so that the flame is directly transmitted to the gas container. Instead, the heat transferred through the through openings may be transferred through convection to the temperature sensitive pressure safety device.

The through opening of the outer housing and the through opening of the inner housing are arranged so as not to intersect with each other, so that the flame is blocked by the wall of the inner housing after passing through the through opening of the outer housing, the temperature sensitive pressure safety Characterized in that delivered to the device.

Adjacent to the temperature sensitive pressure safety device, the through opening of the outer housing and the through opening of the inner housing are arranged to coincide with each other, so that the flame can be directly transmitted to the temperature sensitive pressure safety device when the entire flame occurs. It is done.

Preferably, the outer housing and the inner housing are steel plates made of carbon steel having a thickness of 1 mm or less.

Gas explosion explosion prevention device according to the present invention, when a local flame acts on the composite container equipped with a temperature-sensitive pressure safety device, the heat-sensitive pressure safety device can be quickly operated by inducing heat transfer smoothly. Has the effect of making it work.

That is, by enclosing a gas container made of a composite material with a double wall housing having through openings, the flame is not directly transmitted to the gas container but spreads and spreads twice, in particular, with the through openings of the inner housing. By arranging the through openings so that the through openings of the outer housing do not cross each other, heat propagation by convection is conducted through the space between the inner housing and the outer housing and the space between the inner housing and the gas container after the flame has propagated through the through openings. This allows even local flames to actuate temperature-sensitive pressure safety devices.

In addition, the gas container explosion prevention device according to the present invention, when the flame acts on the composite container equipped with a temperature-sensitive pressure safety device as a whole, is not hindered by the housing of the double wall, the flame quickly reacts temperature Has the effect of being delivered to the pressure relief device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 2 shows a schematic perspective view of the gas container explosion prevention apparatus according to an embodiment of the present invention.

Gas container (1) is mainly made of a composite material that is not good heat transfer, gas containers of other materials may be used. Various kinds of gases, such as compressed natural gas and hydrogen gas, may be accommodated in the gas container 1 and used as fuel for driving a vehicle.

One or both sides of the gas container 1 is provided with a temperature-sensitive pressure safety device (2). The temperature sensitive pressure safety device 2 discharges the gas inside to the outside during overcharging or when the pressure inside the container rises due to local flame exposure. In addition, when the entire gas container 1 including the temperature-sensitive pressure safety device 2 is exposed to a flame with a soluble plug, the metal that seals the soluble plug is melted, thereby releasing the internal gas. To prevent explosion of the gas container.

The gas container 1 is surrounded by a double wall of the inner housing 100 and the outer housing 200. Most preferably, the inner housing 100 and the outer housing 200 surround all of the gas containers with respect to the six surfaces, and the inner housing 100 and the outer housing 200 may be installed only at necessary portions according to the installation place. . In addition, when a plurality of gas containers 1 are provided, the plurality of gas containers 1 may be enclosed at one time, or each gas container 1 may be enclosed.

The inner housing 100 and the outer housing 200 are preferably a steel plate made of carbon steel, and the thickness of the steel plate is preferably 1 mm or less. A plurality of through openings 110 and 210 are formed on surfaces of the inner housing 100 and the outer housing 200. The inner housing 100 and the outer housing 200 are spaced apart from each other so that the intermediate space 300 is formed.

The through openings 110 of the inner housing 100 are preferably arranged so as not to cross the through openings 210 of the outer housing 200. That is, it is preferable that the through opening 110 of the inner housing 100 is not positioned on the straight path of the through opening 210 of the outer housing 200.

The structure of the housing formed with the through openings 110 and 210 reduces the weight of the housing, in addition to the effects of flame propagation and convective heat transfer, which will be described later. In order to surround the gas container (1).

In addition, since the housing is not a sealed structure, there is also an advantage that the risk of causing an explosion due to gas remaining inside the housing remains.

On the other hand, when the gas container 1 is surrounded by the entire flame, it is important for the temperature sensitive pressure safety device 2 to quickly recognize it, so that the interior of the inner housing 100 adjacent to the temperature sensitive pressure safety device 2 is important. The through opening 120 and the through opening 220 of the outer housing 200 are formed to have a larger size than the other through openings 110 and 210, and are arranged to coincide with each other so that the flame has a temperature-sensitive pressure safety device 2. It is desirable to be able to propagate quickly.

Figure 3 is a schematic diagram showing a state in which a local flame acts on the gas container explosion prevention apparatus according to an embodiment of the present invention.

When a local flame is applied to the gas container explosion prevention apparatus according to an embodiment of the present invention, the flame is first propagated along the surface of the outer housing 200 after being hit by the outer housing 200.

The primary dispersed flame is introduced into the outer housing 200 through the through openings 210 of the outer housing 200. The introduced flames, due to the arrangement of the through openings 110 of the inner housing arranged so as not to cross each other with the through openings 210 of the outer housing 200, hit the wall surface of the inner housing 100, thereby Secondary dispersion propagation of the flame takes place.

A portion of the secondary dispersed flame propagates as convective heat through the intermediate space 300, and the other portion of the flame passes through the through openings 110 of the inner housing 100 and the inner housing 100 and the gas container 1. Flows into the space between.

The flame introduced in this way heats the surface of the gas container 1 evenly over an area larger than the working area of the local flame, and at the same time between the inner housing 100 and the gas container 1 by convection. Induce convective heat transfer through space.

As a result, the flame introduced through the through openings 110 of the inner housing 100 and the flame transferred by the convection heat transfer through the space between the inner housing 100 and the gas container 1 are located around the gas container 1. The overall temperature rise is made, which causes the fusible plug of the temperature sensitive pressure device 2 to be activated to release the gas therein.

Due to the rapid gas discharge of the temperature-sensitive pressure device 2, before the gas container explosion, which causes local gas container strength weakening by the local flame of the gas container 1 made of the composite material, occurs, the gas container 1 ) The gas inside is discharged.

The gas container explosion prevention device according to an embodiment of the present invention, the local flame is that the gas container 1 is directly heated by the radiant heat of the flame by the outer housing 200 and the inner housing 100. By blocking and dispersing the flame twice, the rate at which the gas container 1 is heated can be delayed, and the temperature-sensitive pressure safety device 2 is heated by heat transfer by convection so that the gas container 1 can be heated. Before the explosion has the advantage that the gas can be discharged first through the temperature-sensitive pressure safety device (2).

In addition, the gas container explosion prevention apparatus according to an embodiment of the present invention has been described as having a double wall structure, but can be applied to a multi-wall structure of three or more, even in this case through openings formed in one wall It is preferable to arrange so as not to cross each other with the through openings of the opposing wall.

Preferred embodiments of the invention described above have been disclosed for purposes of illustration. Therefore, those skilled in the art having ordinary knowledge of the present invention will be capable of various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes and additions should be regarded as belonging to the following claims.

1 is a schematic diagram showing a state in which a local flame acts on a gas vessel equipped with a temperature-sensitive pressure safety device.

Figure 2 is a schematic perspective view of the gas container explosion prevention apparatus according to an embodiment of the present invention.

Figure 3 is a schematic diagram showing a state in which a local flame acts on the gas container explosion prevention apparatus according to an embodiment of the present invention.

Claims (4)

In the gas container explosion prevention device for preventing the explosion of the gas container equipped with a temperature-sensitive pressure safety device (TPRD) by the flame, An inner housing surrounding the gas container and having through openings arranged on a surface thereof; And It includes an outer housing surrounding the inner housing in a state spaced apart from the inner housing, the through openings are arranged on the surface, The flame is blocked by the inner housing and the outer housing so that the flame is not directly transferred to the gas container, and heat transmitted through the through openings is transferred through convection to the temperature sensitive pressure safety device. Gas container explosion protection. The method of claim 1, The through opening of the outer housing and the through opening of the inner housing are arranged so as not to intersect with each other, so that the flame is blocked by the wall of the inner housing after passing through the through opening of the outer housing, the temperature sensitive pressure safety Gas container explosion prevention device, characterized in that delivered to the device. The method of claim 2, Adjacent to the temperature sensitive pressure safety device, the through opening of the outer housing and the through opening of the inner housing are arranged to coincide with each other, so that the flame can be directly transmitted to the temperature sensitive pressure safety device when the entire flame occurs. Gas container explosion-proof device. The method of claim 1, The outer housing and the inner housing is a gas container explosion prevention, characterized in that the steel plate of carbon steel material having a thickness of less than 1 mm.

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