JPH053873Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a soot blower having a lance tube that can be inserted and removed through the wall of a heat exchanger.

BACKGROUND ART FIGS. 2 to 4 show conventional soot blowing devices.

The soot blower 1 has a lance tube 9 that penetrates the wall 2 of the heat exchanger and is inserted into and removed from it, and is used to blow off dust and the like accumulated inside the heat exchanger. A seal box 3 is installed in the penetrating portion of the lance tube 9 to prevent the gas inside the heat exchanger from leaking to the outside, and seal air A is introduced from the outside. .

The lance tube 9 is connected to and held by the gear box 8, and is also supported by the lance tube support roller 7 of the main body of the soot blower 1. This gear box 8
When receiving a command to start soot blowing operation, soot blower 1
along the center line 10 of the lance tube 9 toward the heat exchanger.

At this time, the amount of deflection of the tip 9' of the lance tube 9 gradually increases due to its own weight, and the trajectory of the tip 9' of the lance tube becomes as shown by the broken line b in FIG. 2. In order to reduce this trajectory b, that is, the amount of deflection of the lance tube tip 9',
The lance tube support roller 7 is lifted up by a deflection suppression amount d with respect to the center line 10. For that reason,
The lance tube tip 9' undergoes a deflection correction as shown by the trajectory c. By combining these loci b and c, a composite locus b' of the lance tube tip 9' is obtained, and the amount of deflection of the lance tube 9 is suppressed.

However, the lance tube 9 passing through the seal box 3 and the wall 2 of the heat exchanger moves vertically and horizontally during the soot blowing operation, and an inclination angle e occurs as shown in FIG. By the way, as the soot blower becomes larger,
In order to reduce the composite trajectory b' of the lance tube tip 9', it becomes necessary to increase the deflection suppression amount d, and the vertical movement amount and inclination angle e of the lance tube 9 at the penetrating portion become larger. The seal plate 6 is restrained and does not move. Therefore, it is necessary to increase the inner diameter f of the seal plate 6 of the seal box 3 through which the lance tube 9 passes to avoid binding with the lance tube 9. Unless a large amount of seal air A is blown into the seal box 3, the heat It was not possible to prevent gas leakage from the exchanger.

3 is an enlarged view of the seal box portion in FIG. 2, and FIG. 4 is a view taken in the direction of the - line arrow in FIG. 3.

Problems that the invention aims to solve As heat exchangers become larger, soot blowers also become larger.
Therefore, the lance tube 9 in the seal box 3 part
The angle of inclination e and the amount of vertical movement of the lance tube 9 become large, but when this happens, there is a problem that the lance tube 9 is restrained by the seal plate 6 and cannot move smoothly. In order to solve this problem, the inner diameter f of the seal plate of the seal box
(In other words, the hole through which the lance tube 9 passes) could be made larger, but if this is done, it would be necessary to blow a large amount of seal air in order to perform the function of the seal box, which would cause the problem of being uneconomical. It was hot.

Means for Solving the Problems In order to solve the above problems, the present invention provides a soot blower having a lance tube that penetrates the wall of the heat exchanger and can be inserted and removed. The lance tube provided in the lance tube penetration portion passes through the seal box to which seal air is supplied, and slides into contact with both walls of the seal box on the side through which the lance tube passes, and the lance tube is inserted through the seal box. To provide a soot blowing device having a through hole and a spherical seal ball provided with a seal air passage that intersects with the through hole.

Effect: According to the above means, the seal ball placed in the seal box rotates while always sliding in contact with the through hole of the seal box, so the lance tube can be moved to an appropriate angle without being restricted. can be achieved, and the sealing performance is also ensured.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. In FIG. 1, the same parts as in FIGS. 2 to 4 are designated by the same reference numerals.

5 is a sealed ball formed into a spherical shape;
This seal ball is provided so that a through hole through which the lance tube 9 passes and a hole through which the seal air A flows intersect.

The seal ball 5 is supported by a lance pipe 9 passing through the seal ball and two support plates 4 provided on the inner wall of the seal box 3. When the lance pipe 9 is tilted, the seal ball 5
is inclined to follow the lance tube 9 while its surface is in sliding contact with the hole of the support plate 4.

Further, when the lance tube 9 moves vertically and horizontally, the support plate 4 moves vertically and horizontally within the seal box 3 via the seal ball 5.

Therefore, the seal ball 5 and the support plate 4 are protected against the inclination and vertical and horizontal movements of the lance tube 9.
is due to the movement of the lance tube 9 within the seal box 3,
Since it can move freely without any restraints, the soot blower can be operated smoothly.

This is particularly effective in soot blowing equipment where the lance tube 9 has a large amount of insertion and removal.Moreover, the lance tube through hole diameter a of the seal ball 5 only needs to be made slightly larger than the outer diameter of the lance tube 9, so the seal air A consumption is reduced. It is also less economical.

Effect of invention According to the present invention, the following effects can be obtained.

(1) There is no restriction of the lance pipe, and stable operation is possible by preventing abnormal noise and overload operation due to restriction.

(2) Only a small amount of sealing air is required, which is economically advantageous.

(3) It can be installed in a soot blower that has a large amount of insertion and removal of the lance pipe, and can produce even greater effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main parts of an embodiment of the soot blower according to the present invention, and FIG. 2 is an explanatory view showing a general soot blower and the locus of the tip of its lance tube. 3 is an enlarged sectional view of the seal box portion of FIG. 2, and FIG. 4 is a view taken in the direction of the - line arrow in FIG. DESCRIPTION OF SYMBOLS 1... Soot blower, 2... Wall, 3... Seal box, 4... Support plate, 5... Seal ball, 6... Seal plate, 7... Lance tube support roller, 8... Gear box, 9...Lance tube.

Claims (1)

[Scope of utility model registration request] In a soot blowing device having a lance pipe that penetrates a wall of a heat exchanger and can be inserted and removed, the lance pipe is provided at a lance pipe penetration part of the wall of the heat exchanger, and a seal box is provided through which seal air is supplied. , a spherical shape that is in sliding contact with both walls of the seal box on the side through which the lance tube passes, and is provided with a through hole through which the lance tube is inserted and a seal air passage that intersects with the through hole; A soot blowing device having a seal ball.