JPS6319768B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sealing device for a soot blower,
In particular, the present invention relates to a sealing device suitable for a long insertion/removal type soot blower in which the diameter of the injection pipe changes.

Conventionally, in the case of long insertion/extraction type soot blowers, the outer diameter of the injection tube did not change in the middle of the injection tube, so it was relatively easy to seal the vicinity of the part where the injection tube was inserted into the furnace wall. In this conventional soot blower, two seal rings having an inner diameter that is approximately the same as the outer diameter of the injection pipe are inserted into the injection pipe, and sealing air is introduced into the space formed by these two seal rings to create a seal. was going there. However, recently, a tapered part has been added to a part of the injection tube, and in the case of a long injection tube with an uneven outer diameter, for example, a long injection tube with a diameter of 10 m, a tapered injection tube is used to reduce the amount of droop of the nozzle at the tip. However, in the case of an injection pipe having such a shape, the seal ring described above makes it impossible to insert or remove the injection pipe.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a device capable of sealing around the injection tube to prevent gas leakage in the furnace regardless of changes in the outer diameter of the injection tube.

In short, this invention arranges one or more seal rings around the outer periphery of the injection pipe of a soot blower whose outer diameter changes, divides this seal ring to follow the change in the outer diameter of the injection pipe, and uses this seal ring to A pressing means such as a spring is arranged to press against the tube side.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 2 denotes a side wall tube constituting a furnace wall, and a tapered injection tube 1 is inserted into the furnace 20 side through this furnace wall. 4 is a housing tube through which the injection pipe 1 is inserted, and 5 is a sealing device mounting board that is attached to the furnace wall via the board mounting seat 3. The housing 6 constituting the seal body is attached to the base plate 5 by the bolt 21.
It is fixed by means of attachment such as. Inside the housing 6, the injection pipe 1 is located at the center.
Multiple sealing rings are arranged around the center. Specifically, the seal ring 11 is removed from the furnace side.
a, 12a and 13a are arranged in close contact with each other, and the seal ring 13 is inserted through a spacer ring 17 arranged orthogonally to these seal rings.
b, 12b and 11b are arranged in close contact in this order. Note that among the rings described above, rings having the same reference numerals (for example, rings 11a and 11
b) have the same shape. FIG. 2 specifically shows this seal ring. Of this seal ring,
The inner diameters of 11a and 11b are approximately the same as the minimum diameter of the injection pipe 1, and they are divided into two to allow the injection pipe 1 to be inserted therethrough. Next, seal ring 13
The inner diameter of b is approximately the same as the maximum diameter of the injection pipe 1. Each of the seal rings formed as described above is connected to the cover flange 1 attached to the end of the housing 6 by the spring 14 disposed inside the spacer ring 17.
Pressed to the 0 side. Similarly, the seal ring 11a,
12a and 13a are pressed against a seal air discharge passage 7 formed annularly on the inner peripheral surface of the housing 6,
An annular seal portion 22 into which seal air flows into the injection pipe 1 is formed between the seal rings 11a, 12a, 13a and the seal rings 11b, 12b, 13b. Furthermore, 11 of these seal rings
For a, 11b, 12a, and 12b, a spring 15 is arranged on the outer periphery of the ring, and presses each ring toward the injection pipe 1 so that each divided ring does not expand unnecessarily due to the division of the ring.

In the above device, when the injection tube 1 is inserted into the furnace, the diameter of the tube increases, and accordingly, the inner diameter portions of the seal rings 11a, 11b, 12a, and 12b are pressed against the injection tube and open outward. I'm going to go.
Further, when the maximum diameter is reached, the inner diameter of the seal rings 13a and 13b and the outer diameter of the injection pipe 1 almost match,
Improves sealing performance. In this way, when operating the soot blower, that is, when inserting the injection pipe into the furnace, the split seal rings 11a, 11b, 12
a, 12b, a certain gap S is formed and some of the seal air leaks out, but the soot blower is operated for a relatively short time, and sealing is most necessary during furnace operation, which is the longest time, that is. When the injection pipe is pulled out, the seal ring 11
a, 11b, 12a, and 12b, the gap S is not formed, so that the sealing performance is good. Further, even if each seal ring is displaced in the moving direction of the injection pipe when the injection pipe 1 is inserted or removed, the space 22 for passage of seal air is always secured by the spacer ring, and the seal ring is returned to its original position by the spring 14. On the other hand, the seal air flows from the seal air nozzle 9 into the sealing annular space 22 formed by the seal ring, and is further discharged from the nozzle 8 through the seal air discharge passage 7.

According to this invention, the injection tube whose outer diameter changes can be freely inserted and removed, and moreover, it is possible to achieve almost perfect sealing.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a sealing device according to the present invention, and FIG. 2 is a perspective view showing the arrangement relationship between an injection pipe and a seal ring. 1...Injection pipe, 6...Housing, 7...Seal air discharge passage, 10...Cover flange, 1
1a, 11b, 12a, 12b...divided seal ring, 13a, 13b...seal ring, 1
4, 15...Spring, 17...Spacer ring.

Claims (1)

[Scope of Claims] 1. In a soot blower that transports an injection pipe whose pipe diameter changes in and out of a furnace, a plurality of split-type seal rings each having an inner diameter that is approximately the same as the minimum diameter of the injection pipe and that is divided into two or more parts are injected. A sealing space into which a sealing medium is introduced is formed around the injection pipe by inserting the split seal ring into the pipe, a means for pressing the split seal ring toward the injection pipe, and a casing placed outside the seal ring. Features a soot blower sealing device. 2. The soot blower sealing device according to claim 1, further comprising a seal ring having an inner diameter substantially the same as the maximum diameter of the injection pipe, in addition to the split seal ring. 3. A spacer ring is arranged perpendicular to the seal ring, and springs are arranged at both ends of the spacer ring to press the seal rings away from the spacer ring, and springs are arranged to press the split seal ring toward the injection pipe. A sealing device for a soot blower according to claim 1 or 2, characterized in that: