JPH067344Y2 - ▲ High ▼ Gas leak detection device for furnace bleeder valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for detecting gas leaking from a seal portion of a valve body and a valve seat in a bleeder valve at the top of a blast furnace.

[Prior Art] Generally, a bleeder valve is installed in the upper part of the blast furnace for pressure control inside the furnace. This bleeder valve is opened to release the pressure when the pressure inside the furnace is abnormal, but airtightness is required when the pressure inside the furnace is normal, that is, when the pressure is closed. When a gas leak occurs, the internal pressure of the furnace drops, causing the condition of the furnace to fall into a bad condition, and the harmful flammable gas leaks to the outside.
This is because it causes pollution.

Therefore, it is necessary to detect the presence or absence of gas leaks, but in the past, workers climbed to the top of the blast furnace and inspected the bleeder valve directly.

On the other hand, there is a technique described in Japanese Utility Model Publication No. 62-119576. This technique aims to prevent gas leakage by filling the space in the middle of the double seal of the bleeder valve with a blocking gas, and does not describe detection of gas leakage.

[Problems to be Solved by the Invention] However, since the bleeder valve is installed at the top of the blast furnace, the inspection work by the worker is extremely difficult and dangerous.

Further, in the technique described in the above publication, the valve structure is complicated and cannot be applied to the existing operating equipment. Further, since the clogging gas must be constantly supplied, a gas supply source is required, and there are technical problems such as pressure resistance against the gas.

Therefore, a main object of the present invention is to provide a device that can be easily attached to an existing bleeder valve and can safely and reliably detect gas leakage from the bleeder valve.

[Means for Solving the Problems] The present invention for solving the above problems is to maintain airtightness with respect to an annular valve seat through a sealing surface, and to prevent a valve In a bleeder valve of a blast furnace in which the body moves to separate from the valve seat and releases the pressure in the furnace, in the valve body, the valve body protrudes upward from the valve seat, the mating surface opens to the crocodile, and the valve body side end A flexible annular cover whose edges are airtightly fixed and whose valve seat side edge is in airtight contact with the valve seat is provided integrally with a jet conduit that communicates with the inside of the cover. On the other hand, a receiving conduit is arranged outside, and this receiving conduit is connected to a gas detector, the jetting conduit is separated from the receiving conduit when the valve body is moved, and the jetting conduit and the receiving conduit are separated when returning. Is provided as a separate body so as to communicate with each other.

[Operation] In the present invention, the leaky gas is collected and the gas is detected through the conduit while the airtightness between the valve seat and the valve body is maintained by the annular cover. Can detect.

Furthermore, such a detection device can be easily attached to any existing bleeder valve.

Since one end of the annular cover was fixed to the valve body and the other end was in airtight contact with the valve seat, the leaked gas was normally collected to detect the leaked gas, but the pressure inside the furnace was released. When the valve body is moved due to the reason, the other end of the annular cover is separated from the valve seat, so that the movement of the valve body is not hindered.

Further, since the valve body is moved, a jet conduit that communicates with the inside of the annular cover is integrally provided, and a receiving conduit is provided outside the jet conduit, and the receiving conduit is used as a gas detector. When the valve body is connected, the jetting conduit is separated from the receiving conduit when moving, and the jetting conduit and the receiving conduit are provided separately so as to communicate with each other at the time of returning. Both can be moved.

[Specific Configuration of the Invention] The present invention will be described in more detail with reference to the drawings.

FIG. 1 is a view showing a state in which the device of the present invention is installed on a bleeder valve. In the figure, 1 is a circular conical valve body when viewed from the plane of the bleeder valve, and 2 is a plane annular valve seat. Valve body 1 and valve seat 2
Are hermetically joined via the annular seal 3. According to the present invention, the mating surface is open to the upper part of the mating surface of the valve body 1 and the valve seat 2, and both edges of the cross section are the valve body 1 and the valve seat 2.
It is characterized in that a flexible annular cover 4 made of, for example, Teflon, which is in airtight contact with each of them, is provided. The annular cover 4 is provided with a mounting member 5 to the valve body 1, and the annular cover 4 is mounted to the valve body 1 with a bolt 6 via the mounting member 5.

Further, as shown in FIG. 2, a leak gas injection conduit 7 is integrated at an appropriate portion of the annular cover 4, and the injection conduit 7 has a tapered surface on the receiving conduit 8 to which the valve seat is attached. Are airtightly joined together. A gas detector 9 is connected to the receiving conduit 8. When the valve is open, the jet conduit 7 moves integrally with the valve body 1 and is separated from the receiving conduit 8 as shown in FIG. An indicator 10 and an alarm device 11 are connected to the gas detector 9 to output the presence / absence of gas leakage.

As shown in FIG. 2, the annular cover 4 may be integrally formed over the entire circumference, but as shown in FIGS. 3 to 6, it is divided into several blocks along the same direction. However, each may be attached to the valve body 1. In this case, the blocks are airtightly integrated in the same direction with an adhesive.

The sectional shape of the annular cover 4 may be a semi-circular shape as described above, an inverted U-shape as shown in FIG. 3, a mountain shape as shown in FIG. 4, or any other shape. The planar shape of the annular cover 4 may be an arc shape or a linear shape (Figs. 5 and 6).
But it's okay.

There is no reason to limit the number of jetting conduits 7 provided on the annular cover 4 to one, and two or more jetting conduits 7 may be provided as shown in FIG.
Rather, the gas leak detection reliability is improved when a plurality of gas leaks are provided.

The material of the annular cover 4 is not particularly limited as long as it is flexible in order to ensure the airtightness of the cover in the fully closed state of the valve, but soft Teflon is particularly preferable.

[Advantage of the Invention] As described above, the device of the present invention can be easily attached to an existing bleeder valve without requiring a major modification of the valve. Further, according to the device of the present invention, it is possible to early predict a phenomenon that causes a downturn in the furnace condition due to a decrease in the furnace top pressure due to a gas leak in the bleeder valve, so that the blast furnace operation is stabilized. Further, when the blast furnace blast is started up, it is necessary to inspect the furnace top, but the inspection work can be reduced by installing the detection device of the present invention.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a gas leakage detection device according to the present invention is attached to a bleeder valve, FIG. 2 is an enlarged view of a joint portion of a gas ejection port and an ejection receiving port, and FIGS. 3 to 6 are annular covers. FIG. 5, FIG. 5 and FIG. 6 are views showing an example of an annular cover having a linear planar shape, and FIG. 7 is a view showing an example in which a plurality of ejection conduits are provided. 1 ... Valve body, 2 ... Valve seat, 3 ... Seal material, 4 ... Annular cover,
6 ... Bolt, 7 ... Jetting conduit, 8 ... Receiving conduit, 9 ... Gas detector.

Claims (1)

[Scope of utility model registration request] 1. An annular valve seat is maintained airtight via a sealing surface, and when an abnormal pressure is generated in the furnace,
In a bleeder valve of a blast furnace in which a valve body moves away from a valve seat to release the pressure in the furnace, in the valve body, the valve body protrudes upward from the valve seat, and the mating surface opens into a crocodile, and the valve body side A flexible annular cover whose end edge is airtightly fixed and whose valve seat side end is in airtight contact with the valve seat is provided integrally with a jet conduit that communicates with the inside of the cover. A receiving conduit is disposed outside the connecting pipe and the receiving conduit is connected to a gas detector. When the valve body moves, the ejection conduit separates from the receiving conduit, and when returning, the ejection conduit and the receiving conduit. A gas leakage detection device for a blast furnace bleeder valve, characterized in that it is provided as a separate body so as to communicate with.