JP4380600B2 - Gas shutoff water sealing valve - Google Patents

Description

  The present invention relates to a gas cutoff water sealing valve installed in the middle of a gas transportation pipe (hereinafter abbreviated as a gas pipe) in order to shut off the gas in the middle of gas transportation.

  In the steel industry, useful fuel gases such as blast furnace gas and converter gas are generated. Therefore, in order to effectively use this fuel gas, the gas generating factory, the gas holder, and the gas using factory are connected by a large-diameter gas pipe.

  In order to shut off the gas in the middle of such gas transportation, for example, a water seal valve as shown in FIG. 2 is installed in the middle of the gas pipe. And in this water sealing valve, the water supply valve 3b is opened and water is supplied from the water supply pipe 3a to the water sealing part 2 installed in the middle of the gas pipe 1, so that the gas pipe 1 is sealed in the middle of the gas pipe 1. Cut off.

  When the water accumulated in the water seal portion 2 reaches a certain water level, it flows out of the overflow down pipe 4a, accumulates in the seal pot 5, and is discharged to the pit via the seal pot drain pipe 6a. In addition, 7a in FIG. 2 is a water distribution pipe for draining the water accumulated in the water seal portion 2 when the water seal is released, and a drain valve 7b is provided in the middle thereof.

However, in the water seal valve having the configuration shown in FIG. 2, the overflow descending pipe 4 a, the seal pot 5, and the seal pot drain pipe 6 a are provided on both sides of the water sealing portion 2, so that the equipment configuration is complicated. . Therefore, for simplification of the configuration, Patent Document 1 discloses a water seal valve in which a drain pipe 7a and an overflow down pipe 4a are integrated.
Japanese Utility Model Publication No. 52-128115

  The water seal valve disclosed in Patent Document 1 is shown in FIG. In this water seal valve, a seal pot 5 is connected to a drain pipe 7 a provided on the bottom surface of the water seal portion 2, and an overflow pipe 4 b and a seal pot drain pipe 6 a are erected at the upper end of the seal pot 5.

  However, in the above-described configuration, during the gas transportation shown in FIG. 3A, dust in the gas dissolved in the water in the seal pot 5 comes into contact with the outside air on the water surface A of the overflow pipe 4b and is oxidized to overflow. There was a problem of closing the tube 4b.

  Therefore, in Patent Document 1, a water supply pipe 8 a provided with a water supply valve 8 b is branched from the upstream side of the water supply valve 3 b and connected to the seal pot 5. With such a configuration, before the water seal shown in FIG. 3B, the drain valve 7a and the drain valve 6b are closed, the water supply valve 8b is opened, and the overflow from the overflow pipe 4b is visually confirmed. It is possible to check whether or not the overflow pipe 4b is blocked.

  However, the water seal valve disclosed in Patent Document 1 can only check whether the overflow pipe is blocked, and cannot prevent the overflow pipe from being blocked.

The problems to be solved by the present invention are the following points, and an object thereof is to solve them simultaneously.
1) In the general gas shut-off water seal valve shown in FIG. 2, although the overflow downcomer does not clog, the gas flows into the overflow downcomer due to the fluctuation of the gas pressure when the water is sealed, and the gas is sealed in the seal pot. That may be leaked from.
2) In the gas shutoff water seal valve shown in FIG. 3, gas overflow does not occur at the time of water seal, but the overflow pipe is clogged.

The gas cutoff water sealing valve of the present invention is
In order not to cause gas leakage and blockage of the overflow pipe while simplifying the configuration,
A water seal valve installed in the middle of the gas pipe to shut off the gas,
A water supply pipe for supplying water to a water seal portion constituting the water seal valve;
A drain pipe connected to the bottom of the water seal;
This drain pipe has a seal pot connected to the bottom,
The seal pot is
The top is located above the water level of the water seal at the time of water sealing,
Between the connection position and the top of the drain pipe, a first seal pot drain pipe is provided at a position where a water head corresponding to the gas pressure at the time of gas transportation is obtained, and a second level is provided at the water level of the water seal part at the time of water sealing. The main feature is that a seal pot drain pipe is provided.

  In the water seal valve of the present invention, the overflow downcomer and the overflow pipe, which are indispensable in the conventional water seal valve, are eliminated, so that the gas leaks at the time of water seal or dissolves in the water in the seal pot at the time of gas transportation. The dust in the gas does not block the overflow pipe.

  In the water seal valve of the present invention, when the drain pipe also serves as the water supply pipe, the configuration can be further simplified.

  In the water-sealed valve of the present invention, the overflow pipe is eliminated and doubles as a large-diameter seal pot. Therefore, dust in the gas does not block the overflow pipe during gas transportation. In addition, since the overflow downcomer is eliminated, even if the gas pressure fluctuates during water sealing, the gas in the overflow downcomer does not spout due to fluctuations in the water level of the water seal.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIG.
FIG. 1 is a view showing an example of the water seal valve of the present invention, in which the seal pot 5 is installed in a vertical state so that the top portion is located above the water level of the water seal portion 2 at the time of water sealing, A drain pipe 7a connected to the bottom of the water seal 2 is connected to the bottom.

  A first seal pot drain pipe 11a is provided between the connection position and the top of the drain pipe 7a in the seal pot 5 at a position where a water head corresponding to the gas pressure during gas transportation is obtained. Moreover, the 2nd seal pot drain pipe 11b is provided in the water level of the water sealing part 2 at the time of water sealing.

  That is, in the present invention, the seal pot 5 is installed in a vertical state, and the overflow pipe that is in the conventional water sealing device is also used as the seal pot 5 having a large diameter. By doing in this way, simplification of a structure is further aimed at rather than the water seal valve disclosed by patent document 1 shown in FIG.

  In addition, during the gas transportation shown in FIG. 1A in which the water supply valve 8b is closed and the drain valve 7b and the drain valve 12 are open, the drain in the gas flows into the seal pot 5 and convection is generated in the seal pot 5. Since this occurs, the seal pot 5 is not blocked.

  When the gas pressure fluctuates during water sealing (in the present invention, the drain valve 7b is open and the drain valve 12 is closed as shown in FIG. 1B), the water sealing valve shown in FIG. In some cases, the water level on the secondary side (the left side of FIG. 2) becomes high, and water flows into the overflow descending pipe 4a on the secondary side, and the gas in the overflow descending pipe 4a is ejected from the seal pot 5.

  However, in the present invention, the seal pot 5 that also serves as the overflow pipe is connected to the bottom of the water seal 2 via the drain pipe 7a, so that even if the gas pressure fluctuates during the water seal, the gas remains in the seal pot 5. There is no gas leakage.

  The above example is merely an example, and the present invention is not limited to the above example, and it goes without saying that the embodiment may be appropriately changed within the scope of the technical idea described in each claim.

  For example, in the example shown in FIG. 1, a water supply pipe 3a is provided separately as in the case of a conventional water seal valve. However, if the drain pipe 7a is also used as the water supply pipe 3a, the number of components is further reduced. The configuration can be simplified. Further, the shape of the water sealing portion 2 is not limited to the V shape or the U shape as long as it is a shape that can store water and block gas.

  The water seal valve of the present invention can be applied not only to gas pipes for transporting blast furnace gas and converter gas, but also to those for blocking all gas transport pipes.

It is a figure explaining an example of the water seal valve of this invention, (a) is the time of gas transport, (b) is a figure which shows the time of a water seal. It is a figure explaining the conventional water seal valve. It is a figure explaining the water-sealed valve disclosed by patent document 1, (a) is the figure at the time of gas transport, (b) is a figure which shows at the time of water sealing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas pipe 2 Water seal part 3a Water supply pipe 3b Water supply valve 5 Seal pot 7a Drain pipe 7b Drain valve 8a Water supply pipe 8b Water supply valve 11a 1st seal pot drain pipe 11b 2nd seal pot drain pipe 12 Drain valve

Claims (2)

A water seal valve installed in the middle of the gas transport pipe to shut off the gas,
A water supply pipe for supplying water to a water seal portion constituting the water seal valve;
A drain pipe connected to the bottom of the water seal;
This drain pipe has a seal pot connected to the bottom,
The seal pot is
The top is located above the water level of the water seal at the time of water sealing,
Between the connection position and the top of the drain pipe, a first seal pot drain pipe is provided at a position where a water head corresponding to the gas pressure at the time of gas transportation is obtained, and a second level is provided at the water level of the water seal part at the time of water sealing. A gas shut-off water sealing valve provided with a seal pot drain pipe. The gas cutoff water sealing valve according to claim 1, wherein the drain pipe also serves as the water supply pipe.

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