JP2967693B2 - High temperature slide valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature slide valve interposed in a flow path for flowing a high-temperature fluid containing a powdery fluid such as a chemical catalyst in a petroleum refining facility.

[0002]

2. Description of the Related Art An example of this type of high-temperature slide valve is shown in FIG.
3, the inlet 2a of the flow path 2 through which the high-temperature fluid including the powdered fluid in the valve box 1 flows is formed in a tapered shape, and a valve provided substantially in the center of the flow path 2 is provided. The seat 3 is formed by a cone member 3A having through holes 3a and 3b in the center and an orifice plate 3B provided on the downstream end surface of the cone member 3A. The valve body 5 is slidably supported by a pair of guide members 4 provided on the downstream end surface of the orifice plate 3B. By driving a hydraulic cylinder such as a hydraulic cylinder (not shown), the valve body 5 By sliding, the flow path 2 can be opened (solid line state in FIG. 3) or closed (virtual line state in FIG. 3). In the drawing, 8 is a heat-resistant material lined on the inner surface of the valve box 1, 9 is a connecting member for integrally connecting the cone member 3A and the valve box 1, and 10 is a connecting member for the inflow port 2a, the valve seat 3 and the valve element 5. An abrasion-resistant material lined in a portion where a high-temperature fluid is strongly applied, the mesh-shaped stainless steel material having a number of hexagonal holes formed therein, and a wear-resistant lining material filled in the mesh of the hexagonal steel. And is formed from

According to the above configuration, the powder fluid such as the catalyst contained in the high-temperature fluid flowing through the flow path 2 is deposited on the sliding contact portion 15 between the valve element 5 and each guide member 4, and the valve element 5 There is a possibility that the slide movement may be hindered.

Conventionally, as shown in FIG. 3, a through hole 17 formed in the valve box 1 along the sliding direction A of the valve element 5 is provided.
The purge pipe 16 is inserted through and fixed to the inside, and the purge pipe 16 and the inside of the flow path 2 are communicated via a pipe 19 with an on-off valve 18. A catalyst attached to the sliding contact portion 15 is continuously or intermittently injected from a purge pipe 16 toward the sliding contact portion 15 through a pipe 19 through a purge gas consisting of a part of a high-temperature fluid flowing through the inside. It is designed to blow off powder fluid such as.

[0005]

In the above-mentioned conventional configuration,
Since the purge pipe 16 is fixed to the through hole 17 of the valve box 1, the interval H between the tip of the purge pipe 16 and the sliding contact portion 15 is widened so that the valve element 5 is fully opened from the normal operation position. When sliding to the position, it is necessary to prevent the tip of the purge pipe 16 from colliding with the valve element 5,
For this reason, the purge gas cannot be intensively and strongly blown to the sliding contact portion 15, and it is difficult to reliably blow off the powder fluid such as the catalyst deposited on the sliding contact portion 15.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a high-temperature slide valve capable of intensively and strongly blowing a purge gas to a sliding portion between a valve body and a guide member.

[0007]

In order to achieve the above object, the present invention provides a valve seat provided at a substantially central portion of a flow path through which a high-temperature fluid including a powder fluid in a valve box flows, and the flow path is provided at the center thereof. A valve pipe that opens and closes is slidably supported by a pair of guide members provided on a downstream end surface of the valve seat, and a purge pipe that injects purge gas toward a sliding contact portion between the valve body and each guide member is provided. In the high temperature slide valve, the purge pipe is movably inserted into the valve box through a through hole provided in the valve body along the sliding direction of the valve body, and the valve body is disposed between the fully open position and the normal operation position. When the slide movement is performed, it is configured to approach and separate from the sliding contact portion in conjunction with the slide movement.

[0008]

In the above construction, when the valve element is stopped at the fully open position, the tip of the purge pipe is at a position where it does not collide with the valve element. From this fully open state, the valve element slides to the normal operating position. Then, in conjunction therewith, the distal end of the purge pipe approaches the sliding contact portion between the valve body and each guide member, so that purge gas is intensively and strongly blown from the distal end of the purge pipe to the sliding contact portion. The powder fluid such as the catalyst deposited on the sliding contact portion can be blown off. When the valve body slides again to the fully open position from the normal operation state, the purge pipe moves away from the sliding contact portion in conjunction with the sliding movement. Therefore, there is no fear that the valve body collides with the tip of the purge pipe.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of a high-temperature slide valve according to an embodiment of the present invention. A purge pipe 16 for injecting a purge gas toward a sliding contact portion 15 between a valve element 5 and each guide member 4 is provided. The purge pipe 16 is movably inserted into a through hole 17 provided in the valve box 1 along the sliding direction A of the valve element 5, and the purge pipe 16 is provided with an interlocking mechanism 20 provided between the purge pipe 16 and the piston stem 6. When the valve body 5 slides between a fully open position (see the solid line in FIG. 1) and a normal operation position (see the phantom line in FIG. 1), the sliding contact portion 1 is interlocked therewith.
5 are arranged so as to approach and separate from each other. In the drawing, reference numeral 21 denotes a gland packing that seals between the through hole 17 and the purge pipe 16, and reference numeral 22 denotes a flexible pipe provided in the middle of a pipe 19 that connects the purge pipe 16 and the inside of the flow path 2. The movement of the purge pipe 16 is permitted. Since the configuration other than the above is almost the same as the conventional example shown in FIG. 3, the same portions are denoted by the same reference numerals and description thereof will be omitted.

In the above configuration, when the valve element 5 is stopped at the fully open position (see the solid line in FIG. 1), the purge pipe 1
When the distal end of the valve body 6 does not collide with the valve body 5 and the valve body 5 slides from this fully opened state to the normal operation position (see the phantom line in FIG. 1), the purge is performed via the interlocking mechanism 20 in conjunction therewith. Since the distal end of the pipe 16 approaches the sliding contact portion 15 and the distance h between the distal end of the purge pipe 16 and the sliding contact portion 15 is narrow, purge gas is supplied from the distal end of the purge pipe 16 to the sliding contact portion 15. When the valve element 5 slides again to the fully open position (see the solid line in FIG. 1) from the normal operation state, the powder fluid such as the catalyst deposited on the sliding contact portion 15 can be blown off by intensively spraying. Since the purge pipe 16 is separated from the sliding portion 15 via the interlocking mechanism 20 in conjunction therewith, there is no possibility that the valve element 5 collides with the tip of the purge pipe 16.

When the valve element 5 slides from the normal operating position (see the phantom line in FIG. 1) to the fully closed position (see the phantom line in FIG. 3), the interlocking mechanism 20 does not operate and the purge pipe 16 slides. It stops at a position close to the contact portion 15 (see the phantom line in FIG. 1), so that the tip of the purge pipe 16 does not collide with the guide member 4.

[0012]

According to the present invention, when the valve body slides to the normal operating position, the tip of the purge pipe approaches the sliding contact portion between the valve body and each guide member in conjunction with the sliding movement. A purge gas can be intensively blown from the end of the pipe to the sliding contact portion to blow off a powder fluid such as a catalyst deposited on the sliding contact portion. From this normal operation state, the valve body is moved to the fully open position. During the sliding movement, the purge pipe separates from the sliding contact portion in conjunction with the sliding movement, so that there is no possibility that the valve body collides with the tip of the purge pipe.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a high-temperature slide valve according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the high-temperature slide valve.

FIG. 3 is a cross-sectional view of a conventional high-temperature slide valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Flow path 3 Valve seat 4 Guide member 5 Valve body 15 Sliding part 16 Purge pipe 17 Through hole 20 Interlocking mechanism A Valve body sliding direction

Claims (1)

(57) [Claims] 1. A valve seat is provided at a substantially central portion of a flow passage through which a high-temperature fluid including a powder fluid flows in a valve box, and a valve body for opening and closing the flow passage is provided on a downstream end surface of the valve seat. In a high-temperature slide valve provided with a purge pipe slidably supported by a pair of guide members and injecting a purge gas toward a sliding portion between the valve body and each of the guide members, the purge pipe includes the valve box. The valve body is movably inserted through a through hole provided along the sliding direction of the valve body, and when the valve body slides between a fully open position and a normal operation position, the valve body slides on the sliding contact portion in conjunction therewith. A high-temperature slide valve, which is configured to approach and separate from the slide valve.