JPS629802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lance tube support for a soot blower with a large protrusion, which does not cause vibration problems and allows good removal of deposits from the boiler tube.

First, a soot blower implementing the present invention will be described. FIG. 1 is a longitudinal cross-sectional view thereof, FIG. 2 is a cross-sectional view thereof, and FIG. 1 is a view taken along the line A--A in FIG. 2.

In the figure, the channel beam 1 has a flat top, straight vertical side plates 2, 3 and an inwardly curved bottom 2a.
3a. As shown in these figures, the channel beam 1 is adapted to be installed in a straight, horizontal position and suspended in the desired manner by means of lifting devices 30 on suitable steel structural supports (not shown). At the same time, it is fixed by a bracket 31 to a bracket 32 attached to a furnace wall 33.

As shown in FIG. 1, the grooved beam 1 is a rack that serves as a guide to control the desired trajectory of the lance tube 7, fluid feed tube 8, and the tip of the lance tube in the boiler furnace. 5, a lance tube support part 9 attached to the tip of the grooved beam 1, and a drive system 6 attached to the rear of the lance tube 7 to provide protrusion into the boiler furnace, retraction movement, and rotational movement. When the grooved beam 1 is mounted perpendicularly to the furnace wall, the lance tube 7 can freely move in and out of the boiler through the opening 34 provided in the boiler wall 33 while being rotated by the drive system 6. It's summery.

The rack 5 has a horizontal portion as shown in FIG.
It is composed of a combination of L ₁ , L ₃ , a descending part L ₂ , and an ascending part L ₄ , and the lance pipe 7
The amount of deflection due to its own weight, which is determined by the length, diameter, and wall thickness of the protrusion into the boiler, can be controlled.

The lance tube 7 has one or more nozzle openings 35 at its tip, and a fluid feed tube 8 that does not move in the rotational direction or the horizontal direction is fitted inside the lance tube 7 so as to be freely inserted and removed. A packing (not shown) is attached to the lance tube 7 for the purpose of fluid sealing, and the packing surface slides on the surface of the feed tube 8 when the lance tube 7 moves.

Further, the feed pipe 8 does not fall out of the lance pipe 7 even when the lance pipe 7 protrudes into the boiler for the longest time, and even when the lance pipe 7 retreats to the position where it comes out from the boiler wall, the lance pipe 8 does not fall out. The length is set so that it does not hit the tip of the 7.

A drive system 6 provided for rotating, protruding, and withdrawing the lance tube 7 protrudes inward from the side walls 2 and 3 of the channel beam 1 and is supported by the side walls, as shown in FIG. It is supported by and moves along a track. Each track includes a bottom rail 100, 101 and a top rail 102, 103.
Consisting of The track extends parallel to the longitudinal direction of the inner wall of the channel beam 1 and is attached to the reinforcing plates 104, 105 by bolts, welding, etc., and has an angle structure.

The tracks 100, 101, 102, 103 form inwardly opening grooves into which the driver support rollers 106, 107 can be rotatably fitted.

The top tracks 102 and 103 are connected to the bottom rail 10
0,101, and supports a rack 5 extending downwardly and longitudinally on this surface.

The rack 5 has a shaft 10 mounted on the inner side adjacent to rotatable rollers 106 and 107 attached to both ends of a shaft 108 which is incorporated into the drive system 6 and rotated via gears from a suitable drive motor (not shown).
8 and pinions 109 and 110, which are attached so as not to cause relative slippage, engage from below to move the drive system 6 and the lance tube 7 attached thereto along the longitudinal direction of the grooved beam 1, allowing it to move forward and backward. If you move to

In addition, the shaft 112 is rotated by the same drive motor via a gear, and the gear 113 is attached to one end of the shaft 112 so as not to cause relative slippage. The lance tube 7 can be caused to rotate by the action of the gear 111 arranged so as to be able to rotate together.

The drive motor has a reversible rotation structure, and at the end of the movement of the lance tube 7, the lance tube 7
The forward and backward movements and direction of rotation can be reversed.

In addition, the locus of the spiral air blowing path drawn by the fluid ejected from the nozzle opening 35 attached to the tip of the lance tube 7 to blow away deposits on the boiler tube is different between when the lance tube 7 is extended and when it is retracted. In order to allow the lance tube to move, it has a key 115 fixed to the lance tube 7 in order to allow a small distance of linear movement without rotational movement of the lance tube 7 at the end of the travel.

The key 115 fits into a slot 116 provided in the gear 111, and within the range of the angle of the slot,
The rotational movement and the forward and backward movement of the lance tube 7 can be made independent.

In another example of application, separate motors are used for forward and backward movement and rotational movement, and furthermore, by giving rotation in the same direction to the lance tube 7 during the protrusion and withdrawal movement of the lance tube, an infinite In some cases, the drive system is manufactured so that the trajectory of the screw-formed air passage can be drawn.

FIG. 7 shows the locus of the screw-shaped air passage of nozzle A. Since the rotation direction of the lance tube 7 is the same regardless of whether the lance tube 7 is protruding or retracting, the ratio between the pitch at which the lance tube 7 advances per one rotation of the nozzle opening 35 and the distance between the furnace walls is If is not an integer, the trajectories of the spiral air ducts will be shifted by a rotation angle corresponding to the fraction and will not pass on the same trajectories.

In yet another example of application, a single motor is used for forward and backward movement and rotational movement, and a one-way clutch is used in the gear mechanism of the drive system 6 to control the direction of rotation of the lance tube 7 when it is extended or retracted. There is also a drive system 6 that is made to be the same so that an infinite number of screw-shaped air channels can be formed.

The lance tube support part 9 is attached to the tip of the grooved beam 1, supports the lance tube 7 at this position, and allows the lance tube 7 to smoothly project, retract, and rotate. 3 and FIG. 4 is a view taken along line B-B in FIG. 3 in the direction of the arrow.

The lance tube support part 9 is connected to the lance tube 7 at least once.
three drum-shaped rollers 52 that are in contact with each other; a bearing 51 that is fitted to both ends of each drum-shaped roller 52 to allow the drum-shaped roller 52 to freely rotate; and a drum that supports the bearing 51. 50,
A pair of cylindrical support rollers 5 that contact the outer edge of the drum 50 and allow the drum 50 to rotate freely.
3. side plates 60, 61 for allowing the lance tube 7 to pass through and for fixing the bearings 56 of the pair of support rollers 53; and a side plate 62 surrounding the outside of the drum and support rollers so as not to interfere with their rotation; 6
3 and a bottom plate 64, a top plate 65 having a protrusion 54 for limiting the upward displacement of the drum, a bracket 31 connected to the side plate 60 and fixed to the boiler wall.
It consists of

Further, the lance tube support part 9 is fixed to the tip of the grooved beam 1 on the side plate 61 side by welding or bolting.

In the lance tube support section 9, the drum 50 is arranged perpendicular to the length direction of the lance tube 7 and rotates within a plane perpendicular to the length direction. Bearings 51 of three drum-shaped rollers 52 rotatably fixed to the drum 50
are also arranged in a plane perpendicular to the length direction of the lance tube 7.

When the lance tube 7 is driven by the drive system 6 and performs rotational movement, protrusion, and retraction movement, the protrusion movement is caused by the rotation of the drum-shaped roller 52 that is in contact with the lance tube 7, and the rotation movement is caused by the rotation of the drum-shaped roller 52 that is in contact with the lance tube 7. teeth,
The drum 50 rotates in the same direction as the lance tube 7, and the support roller 52, which is in contact with the drum 50 at its outer edge, rotates to allow independent movement.

Furthermore, the lance tube support portion 9 is reversible in its rotational, protruding, and retracting directions. The contact position between the lance tube 7 and the drum-shaped roller 52 is as follows:
As the lance tube 7 rotates, the drum 50 rotates in the same direction, so it moves along the arc shape of the drum-shaped roller 52, and as the rotation angle increases, it moves onto the adjacent drum-shaped roller 52. It sequentially rolls on three drum-shaped rollers. Since the cross section of the drum-shaped roller 52 is circular, even if the lance tube 7 is bent due to gravity and undergoes an angular displacement with respect to the horizontal line, the contact position 72 between the drum-shaped roller 52 and the lance tube 7 will remain unchanged. can move smoothly on the circumference of the drum-shaped roller 52.

Furthermore, other examples of the lance tube support section 9 are shown in FIGS. 5 and 6.

The rollers 200 and 201 are mounted on a cage 202 that is swingably supported from above on a horizontal pin 203 that has a cylindrical shape and is supported at the tip of the grooved beam structure 1.
installed within. During the protrusion and retraction of the lance tube 7 that rotates in contact with these rollers, the rollers 200, 201 are threaded on axes that are inclined so as to correspond to the thread angle of the screw drawn by a point on the lance tube. It is installed perpendicular to the pitch line.

The oscillating movement of the cage 202 about the transverse axis formed by the support pin 203 is controlled by the adjustable screw 20
4. Cage 202 is connected to pin 2
Since the lance tube 7 can be swung around the roller 20, the lance tube 7 and the roller 20 are bent due to gravity.
Even if the contact portions of rollers 200 and 201 undergo angular displacement with respect to the horizontal line, the rollers 200 and 201
The position can be maintained as close to line contact as possible.

In addition, this rocking motion is caused by two different types of rocking motion, that is, when the lance tube 7 is extended and when it is retracted, due to the non-rotational protrusion and retraction movements of the lance tube 7 that occur over a short distance when the lance tube 7 is protruded and when it is retracted. A screw-shaped air passage can be formed. Figure 8 shows nozzle A
This figure shows a screw-shaped air duct. S ₁ indicates a movement range without rotation when the lance tube 7 is protruded, and S ₂ indicates a range in which a screw-shaped air passage is formed by rotation during the protrusion movement of the lance tube. S ₃ indicates the range of movement without rotation when the lance tube is retracted, and S ₄ indicates the range of the screw-formed air passage during the retraction movement of the lance tube.

Next, the drawbacks of the above-mentioned conventional lance tube support section 9 will be described.

First, the examples shown in FIGS. 3 and 4 will be described.

(a) The contact point between the lance tube 7 and the drum-shaped roller 52 is
As the drum 50 rotates, the contact points change from 70 to 71 to 72 as shown in the example of FIG. When the contact point is 70, the diameter of the hourglass roller 52 is the smallest, it is located at the center of the bearing, the support rigidity is small, and when the contact point is close to 71, the hourglass roller 52 is at its smallest diameter.
It has a large diameter and is close to one of the bearings, so the support rigidity is high. Further, since the lance tube 7 itself has different wall thicknesses, when the thin wall surface comes into contact with the drum-shaped roller 52, the bending rigidity decreases. In this way, the support rigidity changes periodically depending on the contact position between the lance tube 7 and the hourglass-shaped roller 52. This motion can be described by a coefficient-excited equation of motion as seen in general vibration theory, and it is a well-known fact that unstable vibration may occur.

(b) When the lance tube moves from one drum-shaped roller 52 to an adjacent roller while rolling, there is a backlash shown at the contact point 72, an impact during the transition due to an error in the arcuate shape of the drum-shaped roller 52, and a long period of time. It is a well-known fact that the equation describing the movement of the drum-shaped roller support part due to use is a nonlinear equation, and that it is universally capable of generating unstable vibrations.

Items a and b above make sense if you remember that if a disturbance is introduced into the hand of a long fishing rod, the tip of the fishing rod will easily shake.

(c) The structure is complex and heavy.

The vibration of the long lance tube 7 has a high possibility of damaging the boiler tube, and if vibration occurs, there is a risk of a major accident occurring.

Next, the drawbacks of the examples shown in FIGS. 5 and 6 will be explained.

In this structure, in contact with the lance tube 7, a point on the lance tube matches the threading angle of the screw.
Rollers 200 and 201, which are installed perpendicularly to the thread pitch line, are attached to flat parts 204 and 205 that are integrated with the cage 202, and can rotate around the screw 207 to form the desired thread. The flat portion 20 of the cage 202 is secured by a screw 209 passing through the arcuate slot 208 in the position depicted.
4,205, so the lance tube 7
The lance tube 7 must be rotated in opposite directions when the lance tube is extended and when it is retracted, and the lance tube 7 can be moved in the longitudinal direction of the lance tube without slight rotation at the beginning of the retraction period. By providing this, it is only possible to draw two different screw-shaped air channels.

The boiler is made up of a large number of tubes, and in order to blow away the deposits on these tubes, it seems that the only way to move is on the two screw-shaped air blowers.
Not enough.

The present invention is proposed to solve the above-mentioned drawbacks of the conventional example, and provides a lance tube support that does not cause vibration problems in a suit blower with a large protrusion amount and that improves the removal of deposits from the boiler tube. The purpose is to

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

FIG. 9 is a view of the lance tube support as seen in the direction of the arrow - in FIG. 14.

307 is a circular tube with a circular penetrating hole in the center, and the shape of the cross section cut at its diameter is the first
As shown in Figure 1, the shape of the hole penetrating the circular pipe is
It forms a part 321 of a circular arc and supports the lance tube 7 passing through this hole. Further, the circular tube 307 has a recess along the outer periphery, and is connected to another circular tube 308 and the first one.
It fits rotatably around the O-O line in Figure 1, and the circular tube 3
Multiple lubricant supply ports 320 provided in 08
A lubricating surface 309 is formed between the circular tubes 307 and 308 via the injected lubricant.

Reference numeral 308 is a circular tube that also has a circular penetrating hole in the center, and the inner surface of the circular tube 308 fits into a concave groove provided on the outer periphery of the circular tube 307, so that the circular tube 307 Allow free rotation around line OO (Figure 11). A pin 314 is provided at the top of the outer circumference of the circular tube 308, and the pin 314 is rotatably fitted into a hole 315 made in the top flat plate 1 of the grooved beam. A reinforcing plate 310 is attached to the lower part of the circular tube 308 along the outer periphery of the circular tube 308, and the reinforcing plate 310 is attached to the flat plate 311.
to be welded or otherwise fixed.

A flat plate 312 is fixed to the lower surface of the flat plate 311, and forms a lubricating surface 323 with a flat plate 313 fixed on the bottom plate 301 attached to the lower surface of the tip of the grooved beam. Also, the flat plate 301
An opening 316 is provided in the flat plate 31.
1 is fitted with a pin 317 installed on the diametrical line opposite to the pin 314, and the circular tube 308 is connected to the pin 31.
around 5,317, i.e. H- in FIG.
It can swing around the H line on the lubricated surface 323.

17 is a view of FIG. 10 viewed in the direction of arrow JJ, and FIG. 18 is a view of FIG. 10 viewed in the direction of arrow KK. A flat plate 313 fixed to the bottom plate 301 attached to the tip of the grooved beam 1
is the flat plate 3 in contact via the lubricant of this flat plate.
12 is enlarged so that it can swing around pin 317.

In addition, the reinforcing plate 310 has a circular tube 308 attached to the 10th
A metal fitting 319 into which a control cable or rod 318 for swinging around line H-H in the figure can be fitted.
Two are attached (Figure 10).

This cable or rod 318 is connected to the lance tube 7.
Its position is controlled by a suitable control device which detects the extended or retracted position of the actuator and generates the desired operating signal. Alternatively, instead of using the cable or rod 318, the rotation angle position of the circular tube 308 may be determined by transmitting torque directly to the pins 314, 317.

Thereafter, the circular tubes 307, 308, the reinforcing plate 310, the flat plate 311 fixed to the reinforcing plate 310,
It is fixed to the flat plate 311 and is attached to the flat plate 31 through a lubricant.
3, a flat plate 312 and a circular tube 308 that are in swingable contact with
A structure consisting of a metal fitting 319 that fits with a control cable or rod 318 for swinging the lance tube along line H--H in FIG. 10 is called a lance tube support.

Another method of swinging between the lance tube support and the flat plate 301 attached to the tip of the channel beam is shown in FIGS. 12 and 13.

Four rollers 325, 326, 327, 328
the bottom plate 30 at the tip of the grooved beam.
1 and in contact with the lower flat plate 311 of the lance tube support, so that the lance tube support can swing around the line H--H in FIG. four rollers 32
5, 326, 327, and 328, as shown in FIG. 13, the pin 317 is arranged concentrically and in the tangential direction of the circle from the center of the penetrating hole 316.

Another method of fitting the circular tubes 307 and 308 is shown in FIG. The circular tube 307 has a convex shape 322 on its outer periphery, and the circular tube 308 forms a concave groove that can fit into the convex shape 322 of the circular tube 307 and makes contact with it via a lubricant. , can freely rotate around its center line P-P.

A flat plate 300 with a hole through which the lance tube 7 can pass is attached to the tip of the grooved beam at a distance that does not impede movement of the lance tube support. It can then be attached to the boiler wall.

The plate 300 is not necessary if the channel beam structure has sufficient strength when attached to the boiler wall by the brackets 31.

Next, the functions and effects of the present invention will be explained.

14 and 15 are views of FIG. 9 viewed in the direction of arrow GG.

In Fig. 14, when the lance tube support is set at right angles to the longitudinal direction (X direction) of the lance tube 7 (the intervals between Q and S, and between R and T are equal), the lance tube 7 is moved in the direction of the arrow. When rotating, the lance tube 7 and the circular tube 307 can rotate in the direction of the arrow in the circular tube 308 without relative slippage due to the massing force acting on both surfaces, but they cannot move in the X direction or , movement in the opposite direction to X is by lance tube 7 and circular tube 307.
This is not possible without relative slip between.

However, as shown in FIG. 14, the T side of the lance tube support approaches the R side of the flat plate 300, and
If the side takes a position away from the Q side, i.e.
When the lance tube 7 is rotated counterclockwise with respect to the longitudinal direction of the lance tube 7, the lance tube 7 receives a force from the circular tube 307 in the direction of the arrow X, and moves in the direction of the arrow X. If the rotation direction of the lance tube 7 is opposite to the arrow,
The lance tube 7 moves in the direction opposite to the arrow X. Thereafter, the T side of the lance tube support approaches the R side of the flat plate, the S side moves away from the Q side, and the opposite movement is performed as the lance tube around the axis perpendicular to the longitudinal center line of the lance tube. This is called rotation or rocking of the support.

If the lance tube support is set as shown in FIG. 14 and the direction of rotation of the lance tube 7 is in the direction of the arrow in the figure, the lance tube 7 will protrude into the boiler.
At the end of the protrusion of the lance tube 7 the lance tube support is placed in the first position.
As shown in Fig. 5, contrary to Fig. 14, the S side is brought closer to the Q side and the T side is moved away from the R side, that is,
If the lance tube 7 is set at a position rotated clockwise with respect to the longitudinal direction, the lance tube 7 will maintain the same rotation direction as shown in FIG. 14, and its moving direction will be the Y direction in FIG. 15. It is drawn in from inside the boiler.

Furthermore, if the lance tube support body is set at the position where the lance tube support body is rotated counterclockwise with respect to the longitudinal direction of the lance tube as shown in FIG. The lance tube 7 can be ejected while maintaining the same direction of rotation as shown (ie, without changing the direction of rotation).

In reality, the lance tube 7 is driven by the drive system 6 to rotate, extend, and retract, so that the thread drawn by one point of the lance tube 7 and the lance tube support are perpendicular to each other. (In other words, the side surface 5 of the circular tube
If the lance tube support is rotated and held around an axis perpendicular to the longitudinal center line of the lance tube until the lance tube 7 and the circular tube 307 are at right angles to each other, the lance tube 7 and the circular tube 307 All the sliding friction between the lance tubes is removed, and the load and wear on the lance tube 7 are significantly reduced, and at the same time, the lance tube is free from the vibration-generating force shown in FIGS. 3 and 4 of the embodiments.
Smooth rotational movement, protrusion, and retraction movement can be performed.

Even if the lance tube 7 is bent due to gravity and there is an angular displacement between the lance tube 7 and the horizontal, the circular tube 307
Since the shape of the hole passing through forms a part 321 of a circular arc, the contact point between the lance tube 7 and the circular tube 307 moves smoothly on the circular arc 321. Cage 202 as shown in Figure 6
The swinging mechanism of the is not necessary.

In addition, since the rotational direction of the lance tube 7 can be kept the same during the protrusion and retraction movements of the lance tube 7, as shown in FIGS. At the start, no mechanism is needed to produce a small vertical movement of the lance tube 7 without a rotational movement.

Regarding rotation of the lance tube 7 and the lance tube support about an axis perpendicular to the longitudinal center line of the lance tube, the lance tube 7 and a portion 321 of the circular arc of the hole penetrating the circular tube 307 come into contact. Because of the structure, this can be done with a small amount of force, and there is no need to apply excessive force to the lance tube 7 and damage it.

Furthermore, when the protrusion and retraction momentum of the lance tube 7 is large, it is necessary to increase the amount of rotation of the lance tube support in a plane perpendicular to the longitudinal direction of the lance tube. By increasing the size by an appropriate amount and making the hole that passes through it larger, it is possible to move the lance tube 7 smoothly without disturbing it.

Furthermore, in an emergency, the protrusion and retraction movements of the lance tube can be braked by reversing the rotation angle of the lance tube support about an axis perpendicular to the center line in the longitudinal direction of the lance tube.

In addition, if the frictional force between the lance tube 7 and the feeding tube 8 and the frictional force of the device that supports the lance tube at the rear and performs the protruding, retracting, and rotational movements are small, the circle of the lance tube support is small. pipe 307, circular pipe 308
By rotationally driving the lance tube within the lance tube, it is possible to cause the lance tube 7 to protrude and retract. In this case, the lance tube drive system 6 becomes unnecessary.

[Brief explanation of the drawing]

Figures 1 to 8 relate to conventional examples, where Figure 1 is a longitudinal cross-sectional view of the soot blower, Figure 2 is a cross-sectional view, and Figure 3 is a cross-sectional view of the soot blower.
The figure is a sectional view of the lance tube support part, FIG. 4 is a sectional view taken along the line B-B in FIG. 3, FIG. 5 is a sectional view of another example of the lance tube support part, and FIG. 6 is a side view thereof. FIG. 7 is a line diagram showing the locus of the screw-formed air passage of nozzle A, FIG. 8 is a line diagram showing the screw-formed air passage of nozzle A, and FIGS. The figure shows a lance support, a sectional view taken along the - line in FIG. 14, FIG. 10 a front view of a circular tube, and FIG. 11 a sectional view of a circular tube 307.
Figures 12 and 13 show the lance support and the flat plate 30.
14 and 15 are cross-sectional views showing the rotation of the circular tube taken along the line G-G in FIG. 9, and FIG. 16 is circular tube 3
07,308 sectional view showing another method of fitting, 1st
7 is a cross-sectional view taken along the line J--J in FIG. 10, and FIG. 18 is a cross-sectional view taken along the line K--K in FIG. 1...Top plate, 7...Lance tube, 31...Bracket, 301...Bottom plate, 307, 308...
Circular pipe, 309, 323... Lubricating surface, 310... Reinforcement plate, 300, 311, 312, 313... Flat plate, 314, 317... Pin, 315... Hole, 3
16...Opening, 318...Cable or rod, 319...Metal fitting, 321...Part of circular arc, 3
25, 326, 327, 328... Laura.

Claims (1)

[Claims] 1 In the lance tube support method for a suit blower, a circular tube that has an opening that the lance tube can pass through and that opening forms a part of a circular arc, and the circular tube fits inside another circular tube at its outer periphery. The fitting surfaces of the two circular tubes form a lubricating surface and are in contact with each other via a lubricant, the inner circular tube is rotatable around its center line within the outer circular tube, and the outer circular tube is rotatable around its center line. A circular tube cannot rotate around its center line, and a pair of pins are provided on the outer periphery of the outer circular tube at the top and bottom of the vertical line. A lance tube support body characterized by being able to swing integrally with a circular tube fitted inside the lance tube support body.