JPS5833018A - Soot blower - Google Patents

Abstract

PURPOSE:To eliminate vibration and improve the attachment removing effect of a boiler tube by a method wherein a support roller is constituted by a single rotary hourglass shaped roller which supports a lance tube from the downward, and disposed on a base stand which is rotatable in a horizontal plane. CONSTITUTION:An hourglass-shaped roller 400 supporting the lance tube 7 is supported by a pair of bearings 401 and 402 and mounted on a lower flat plate 311. The lower flat plate 311 and a flat plate 312 have an elongated through- hole 316 of the same shape, and these plates 311 and 312 are aligned with each other by aligning these holes 316. A pin 317 projected upwardly from a bottom plate 301 of a channel-shaped beam is inserted, and therefore, the roller 400 can rotate on a lubricate surface 323 around the pin 317. The through-hole 316 is pierced in a slit shape in a line b-b direction around a point of intersection 420 of the axial line a-a of the support roller 400 and the line b-b which is perpendicular to the line a-a. The pin 317 which engages with the through-hole 316 can move between the points 421 and 422, and around the pin 317 at the respective points the support roller 400 can rotate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soot blower, and more particularly to improvements in the lance tube support structure thereof.

First, the structure and function of a conventional soot blower will be explained.

FIG. 1 is a longitudinal sectional view of the soot blower. In FIG. 1, the symbol l indicates a grooved beam. A part of this cross section is shown in FIG. FIG. 1 is a view taken along line A--A in FIG. 2 and viewed in the direction of the arrow. The channel beam 1 has a flat top, straight vertical side plates 2.3 and an inwardly curved bottom flange 4.
It is formed from a and 4b. As shown in these figures, the channel beam l is straight and is adapted to be installed in a horizontal position and is secured to a suitable steel structural support (not shown) by a lifting device 30.
at the same time that the bracket 31 is suspended in the desired manner.
is fixed to a bracket 32 attached to a furnace wall 33.

As shown in FIG. 1, the grooved beam 1 serves as a guide for controlling the desired trajectory of the lance tube 7, fluid feed tube 8, and the tips of the lance tubes in the boiler furnace. It consists of a lance tube support part 9 attached to the tip of the lance tube 5 and the grooved beam 1, and a drive system 6 attached to the rear part of the lance tube 7 to provide protrusion into the boiler furnace, retraction movement, and rotational movement. The grooved beam 1 is connected to the furnace wall 33.
When the lance tube 7 is mounted perpendicularly to the boiler, the drive system 6 allows the lance tube 7 to freely move in and out of the boiler through an opening 34 provided in the furnace wall 33 while rotating.

As shown in FIG. 1, the rack 5 has a horizontal portion Ll.

Consisting of a combination of L3, descending part L2, and rising part L4, 2
By interaction with the lance tube support part 9, the amount of deflection due to its own weight, which is determined by the length, diameter, and wall thickness of the lance tube 7 protruding 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 horizontal direction is fitted into the interior of the lance tube 7 so as to be freely removable. ing. A seal is attached to the lance tube 7 for the purpose of sealing fluid.
(not shown), the backing surface of which slides over the surface of the feed tube 8 during movement of the lance tube 7.

In addition, even if the lance pipe 7 protrudes into the boiler for the longest time, the feed pipe 8 will not fall out of the lance pipe 7, and the lance pipe 7 will retreat to the position where it will come out from the boiler wall. The length is set so that it will not hit the tip of the lance tube 7 even if the lance tube 7 is moved.

A drive system 6 provided for rotating, protruding, and withdrawing the lance tube 7 protrudes inward from the side plates 2 and 3 of the grooved beam 1 and is supported by the side plates, as shown in FIG. It is supported by a track along which it moves. Each track has a bottom rail 100.101 and a top rail 100.101.
- consists of rules 102.103. The raceway 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.

Rails 100.101.102.103 open inward (
A groove is formed in which the driver support roller 106.
107 can be rotatably fitted.

The top rails 102, 103 are connected to the bottom rails 100, 1
01, and supports a rack 5 extending downward in the longitudinal direction on this surface.

The second gear 5 includes a shaft 108 that is incorporated into the drive system 6 and rotated by a suitable drive motor (not shown) via gears.
Rotatable row 2106.10 attached to both ends of
Pinions 109 and 110 attached to the adjacent inner sides of the shaft 108 so as not to cause relative slippage engage with each other from below to move the drive system 6 and the lance tube 7 attached thereto in the longitudinal direction of the grooved beam 1. Move freely forward and backward along the line.

Also, a shaft 112 rotated by the same drive motor via a gear, a gear 113 attached to one end of the shaft 112 so as not to cause relative slip, and a lance that meshes with the gear 113. The lance tube 7 can be caused to rotate by the action of a gear 1110 arranged so as to be able to rotate together with the tube 7.

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

In addition, the trajectory of the spiral air passage 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 was changed between when the lance tube 7 was extended and when it was retracted. At the end of the travel, the lance tube 7 has a key 115 fixed to it in order to allow a small distance of linear movement without rotational movement.

The key 115 is a slot 116 provided in the gear 111.
The rotational movement and the forward and backward movement of the second tube 7 can be made independent within the angular range of the slot.

In another application, for forward and backward movement and rotational movement,
However, by using a separate motor to rotate the lance tube 79 in the same direction during the protrusion and withdrawal movements, it is possible to draw an infinite spiral air path. Some manufacture the drive system 6 in other countries.

FIG. 7 shows the locus of the helical air passage of nozzle A. Since the rotation direction of the lance tube 7 is the same regardless of the protrusion or retraction movement of the lance tube 7, the nozzle opening 3501
If the ratio between the pitch at which the lance tube 7 advances in the circuit and the distance between the furnace walls is not an integer, the trajectory of the spiral air channel will be shifted by the rotation angle corresponding to the fraction, and S will not pass on the same trajectory. .

In yet another application example, forward and backward movement and rotational movement are combined into one
A one-way clutch is used in the gear mechanism of the drive system 6 to eject the two-way tube 7.

By making sure that the lance tubes 7 rotate in the same direction during retraction, an infinite spiral airflow path can be formed.

The structure of the lance tube support part 9 is attached to the gripping end of the grooved beam 1 and supports the lance tube 7 at this point i, so that the lance tube 7 can smoothly project, retract, and rotate. 3, and FIG. 4 shows a view taken along line B--B in FIG. 3 in the direction of the arrow.

The lance tube support part 9 is fitted with three hourglass-shaped rollers 52, at least one of which is in contact with the lance tube 7, and is fitted to both ends of each hourglass-shaped roller 52, so that the hourglass-shaped row 252 can freely rotate. a bearing 51, a drum 50 for supporting this bearing 51, a pair of cylindrical support rollers 53 that contact the outer edge of the drum 50 and allow the drum 500 to rotate freely, and a lance tube 7 that can be penetrated. and a side plate 60 for fixing the bearings 56 of the pair of support rollers 53.
61, and a side plate 62, 63 and a bottom plate 64 surrounding the outside of the drum so as not to impede the rotation of the support roller.
It consists of a top plate 65 having a protrusion 54 for limiting the upward displacement of the drum, and a bracket 31 connected to the side plate 60 and fixed to the boiler wall. Also, the lance 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 disposed perpendicular to the length direction of the second lance tube 7, and rotates within a plane perpendicular to the length direction. The bearings 51 of the three drum-shaped rows 252 that are rotatably fixed to the drum 50 are also connected to the lance tube 7.
is placed in a plane perpendicular to its length.

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 hourglass-shaped row 252 that is in contact with the lance tube 7, and the rotation movement is caused by the rotation of the hourglass-shaped row 252 that is in contact with the lance tube 7.

A drum 50 and a drum 5 rotating in the same direction as the pipe 7
They can each move independently by rotation of the support roller 53 which is in contact with the roller 0 at its outer edge.

Moreover, the directions of rotational movement, protrusion, and retraction movement of the second tube support part 9 are reversible. Since the drum 50 rotates in the circumferential direction as the lance tube 7 rotates, the contact position between the lance tube 7 and the hourglass roller 52 moves along the arc shape of the hourglass roller 252, and as the rotation angle increases, the drum 50 rotates in the circumferential direction. , and move onto the adjacent hourglass-shaped rollers 252, thereby rolling on the three hourglass-shaped rollers one after another. Since the cross section of the drum-shaped row 252 is circular, the lance tube 7 bends due to gravity,
Even if it is internally displaced with respect to the horizontal line l, the contact position between the hourglass roller 52 and the lance tube 72 remains smooth.
Can move on the circumference of 2.

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

The rollers 200, 201 are installed in a cage 202 that is swingably supported from above on a lateral support pin 203 that is cylindrical and supported at the tip of the grooved beam l. The rollers 200, 201 rotate in contact with these rollers, and during the extension and retraction of the lance tube, the pitch line of the helix on the axis is inclined so that a point on the lance tube corresponds to the helical angle of the thread drawn. installed perpendicular to the

The rocking movement of the cage 202 about the transverse axis formed by the support bin 203 is limited by the adjustable screw 2041. Since the cage 202 can swing around the pin 203, due to the curvature of the lance tube 7 due to gravity, the contact portion between the lance tube 7 and the rollers 200 and 201 is internally displaced with respect to the horizontal line, and the shark. The rollers 20 (0, 201) can maintain a position as close to line contact as possible with the lance tube 7.

Moreover, this rocking motion is caused by two different types of swinging motion, that is, when the lance tube 7 is extended and when it is retracted, due to the non-rotational protrusion and retraction movement of the lance tube 7 that occurs over a short distance when the lance tube 7 is protruded and when it is retracted. A spiral airflow path can be formed. 8th
The figure shows a nozzle 80') spiral air channel. Sl indicates a movement range without rotation when the lance tube 7 is projected, and 82 indicates a range in which a spiral airflow path is formed by rotation during the protrusion movement of the lance tube. S3 indicates a movement range without rotation when the lance tube is retracted, and 84 indicates a range of the spiral air passage during the retraction movement of the lance tube.

Now, the drawbacks of the conventional soot blower as described above, particularly the lance tube support portion 9, are as follows.

In FIGS. 3 and 4, the contact point between the lance tube 7 and the drum-shaped roller 52 changes from 70 to 71 to 72 as the drum 5o rotates, as shown in the example in FIG.

When the contact point is 70, the diameter of the drum-shaped roller is the smallest;
When it is at the center of the bearing and has low support rigidity and the contact point is close to 71, the diameter of the hourglass roller is large and it is close to one of the bearings, so the support rigidity is high.

Furthermore, since the lance tubes themselves have different wall thicknesses, when the thin palm of the lance tube comes into contact with the drum-shaped roller, 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 roller.

This motion can be described by a coefficient excitation equation of motion as seen in general imaging theory, and it is a well-known fact that unstable vibrations may occur.

In addition, when the lance tube moves from one drum-shaped row 252 to the adjacent roller while rolling, there is play as shown in 72, impact during transition due to an error in the arc shape of the drum-shaped roller, and the drum-shape caused by long-term use. Regarding the play in the roller support section,
It is a well-known fact that the equation describing this motion is a nonlinear equation and may cause unstable vibrations.

The above two points make sense if you imagine that if you put a disturbance in the hand of a long fishing rod, the tip of the rod will shake.

Furthermore, this lance tube support portion 9 has a complicated structure and is heavy. For this reason, photographing 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.

Furthermore, the shortcomings in FIGS. 5 and 6 are as follows.

A roller 200 is installed in contact with the lance tube 7 so as to match the helical angle of the screw drawn by a point on the lance tube and perpendicular to the pitch line of the helix.
201 C. Cage 2o2 integrated tonatsuta flat part 205
．． 206 and can rotate around the screw 207 to draw a desired spiral (arc-shaped slot in position) 20
Because of the structure in which the lance tube 7 is fixed to the flat parts 205 and 206 of the cage 202 by screws 209 passing through the lance tube 7, the lance tube 7 must be rotated in opposite directions when the lance tube 7 is extended and retracted. By providing a mechanism that allows the lance tube 7 to move in the longitudinal direction without a slight rotation at the beginning of its retracting, two different spiral airflow paths can be drawn. do not have.

Boilers are made up of a large number of tubes, and the immobility of the two helical air blowers is not sufficient to blow away the deposits on these tubes.

In addition, in order to shorten the movement time of the lance tube and reduce the amount of fluid (e.g. steam) to be supplied, when changing the movement speed when the lance tube is extended and retracted, it is necessary to change the movement speed independently of the rotational movement. This causes strain on the gears in the lance tube's drive system.

The purpose of the present invention is to improve the structure of a soot blower and provide a new soot blower that does not have the above-mentioned drawbacks.In particular, it is an object of the present invention to provide a soot blower with a large protrusion that does not have the problem of photographing.
, and to improve the removal of deposits from boiler tubes.

That is, the present invention is characterized by the following points.6 (a) It has a structure in which the lance tube is supported by a drum-shaped roller that is installed on a plywood board that can rotate within the if plane and can rotate freely around the rotation axis. (b) As a result, the axis of the support roller is automatically perpendicular to the pitch line of the helical movement drawn by the protrusion/retraction movement and rotational movement of the lance tube.

(C) Therefore, the movement of the lance tube is extremely unclear.

(d) Since the support roller automatically follows the helical movement of the lance tube, the direction of rotation of the lance tube can be the same when the lance tube is extended and when it is retracted. Therefore, the nozzle at the tip of the lance tube To be able to draw an infinite number of spiral trajectories and to significantly enhance the soot removal effect of boiler tubes.

(e) Also, the speed at which the lance tube is extended and retracted can be changed independently of the rotational motion.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments illustrated in FIG. 9 of the accompanying drawings.

FIG. 9 is a plan sectional view of the lance tube support section, ie, the lance tube support body, cut from the center of the lance tube 7.

Figure 10 shows 1. It is a front view of FIG. 9 seen in the CC direction, and FIG. 11 is a side view of FIG. 9 seen in the D-D direction.

An hourglass-shaped support roller 400 that supports the lance tube 7 is supported by its bearings 401 and 402 and is attached to the lower flat plate 311.

A flat plate 312 is fixed to the lower surface of the lower flat plate 311, as shown in the direction of arrow E-E in FIG. 11, that is, as shown in FIG.

Also, on the bottom plate 301 there is a first
As shown in FIG. 3, a flat plate 313 is fixed and forms a lubricating surface 323 with the flat plate 312.

The lower flat plate 311 and the flat plate 312 have elongated through holes 316 of the same shape, and are installed so that they match.

Pins 317 projecting upward from the bottom plate 301 of the grooved beam are fitted into these through holes, and the support rollers 40
0 is pin 317. The lubricating surface 323 can be rotated around the lubrication surface 323.

The through hole 316 is formed by a straight line b-b centered on the intersection 420 between the axis a-a of the support row 2400 and the perpendicular direction line b-b.
This is a long and narrow through hole drilled in the b direction, and the pin 317 that fits into the pin 317 can freely move between points 421 and 422 within the through hole 316, and the support roller 400 moves around these points 421 and 422. Rotate.

However, the bottom plate 301 has stoppers 318.319.32.
0 and 321 are provided, and the stopper position is determined so that when the lower flat plate 311 rotates around the pin 317, the axis aa of the support roller 400 does not become parallel to the longitudinal direction of the second tube 7. It is being

If the axis a-a and the longitudinal direction of the lance tube 7 become parallel, there is a risk that the lance tube 7 will fall off from the roller 400.

As a method for rotating the flat plate 311 to which the support roller 400 is attached, the method shown in FIGS. 14 and 15 is also possible.

That is, four cylindrical auxiliary rollers 325, 326, 32
7 and 328 are arranged upward on the bottom plate 301, and these auxiliary rollers support the lower flat plate 311 of the lance tube support.
It is also possible to rotate around the pin 317.

Also, four auxiliary rows 2325, 326, 327 and 3
28 are arranged on arbitrary concentric circles at intervals in the tangential direction thereof, as shown in FIG.

The operation of the above-described structure and the effects that can be achieved thereby will be described below.

First, the support roller 400 is adjusted so that its axis line a-a is automatically perpendicular to the pitch line of the spiral drawn by one point on the lance tube due to the protruding and retracting movement and rotational movement of the lance tube 7. No. 16.17 that it has a core function,
This will be explained using Figure 18.

FIG. 16 shows a situation in which the support roller 400 is self-centering and stable when the lance tube 7 is protruding and rotating counterclockwise in the protruding direction. Force F acting on the point of contact between support roller 400 and lance tube 7. (
The support roller 400 and the flat plate 311 are pulled in the direction of the pitch line of the spiral drawn by one point on the lance tube by the resultant force of the protruding motion and rotational motion acting on the lance tube. At this time, an elongated through hole 316 is bored along a line bb direction perpendicular to the support roller axis aa of the lower flat plate 311.
The pin 317 fitted with the point 421 on the b-b line
It moves until it stops.

In other words, since the extension line of the force Fo passes through the center point 421 of the pin 317, there is no moment (and the support roller 400 is stable).

When the support row 2400 is slightly tilted further clockwise than the state shown in FIG. 16, as indicated by the dotted line in FIG.
Since o does not pass through point 421, a counterclockwise rotational moment acts to return row 2400 to the position indicated by the solid line.

Conversely, when the support roller 400 is tilted counterclockwise from the state shown in FIG. 16, as indicated by the dotted line in FIG. 18, the moment acting to return it to the solid line position similarly acts in the clockwise direction.

With this automatic alignment function, even if the protruding motion and rotational motion of the lance tube are arbitrarily changed independently, the direction of the force F acting on the lance tube and the axis of the support roller 400 correspond to the helical pitch line. Since the core line a-a is always automatically perpendicular, the spiral air passage drawn by the tip of the lance tube can be arbitrarily and infinitely selected, and the soot removal effect can be increased.

On the other hand, when the lance tube 7 changes from the protruding motion to the retracting motion while the rotational direction remains unchanged, the force F applied to the row 2400 as shown in FIG. is F. f, the row 2400, which had been stable up until now using the point 421 at one end of the through hole 316 as a fulcrum, moves and becomes stable in the state shown by the dotted line in the figure. FIG. 20 shows this state. That is, the lance tube 7 performs a retracting motion and a rotational motion, and the resultant force is F. It is r.

The pin 317 is located at the other rotational center point 422 of the elongated through hole 316, and the support roller 400 is rotatable around this point, and has a self-centering effect in the same manner as during the protrusion movement.

When the lance tube 7 is changed from a protruding motion to a retracting motion,
In the process of changing the direction of the support row 2400.

The longitudinal direction of the lance tube 7 is aligned with the axis a- of the supporting row 2400.
a try to be parallel, and the support roller 400
There is a risk of it falling off. In order to prevent this, the movement range of the lower flat plate 311 is limited by the stoppers 318, 319, 320, and 321, and the protruding and retracting movements of the lance tube 7 are switched in the following steps to smoothly lower the support. You can change the direction of 2400. This will be explained with reference to FIGS. 21(a), (b), (C), and (d). The direction of force action is shown on the left side of each figure. Initially, when the lance tube 7 is performing a protruding motion and a rotating motion (this state is A), the rotating motion is first temporarily stopped (this state is B). Next, the protruding motion is changed to the retracting motion (this state is referred to as C). At this time, the lower flat plate 311 moves in the straight line b-b direction (see FIG. 20), and the rotation center of one of the elongated through holes 316 Instead of 421, the other rotational center point 422 is located at the pin 317.

Finally, by adding a rotational motion, the axis a-a direction of the support row y 400 becomes perpendicular to the helical pitch line determined by the retracting motion and rotational motion of the lance tube 7.5, self-alignment is performed. (Let this state be D).

As a result, even if the lance tube 7 rotates in the same direction and changes from protruding motion to retracting motion, the support row 2400 automatically aligns itself, allowing unlimited selection of spiral air channels drawn by the tip of the lance tube. This increases the soot removal effect.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a general soot blower, Fig. 2 is an enlarged cross-sectional view of its drive system, Fig. 3 is an enlarged cross-sectional view of an example of the lance tube support part, and Fig. 4 is an enlarged cross-sectional view of an example of the lance tube support part. B-B in Figure 3
5 is an enlarged cross-sectional view of the other side of the lance tube support, FIG. 6 is a cross-sectional view thereof, and FIGS. 7 and 8 show the trajectory of the nozzle at the tip of the lance tube. A schematic side view for explanation. FIG. 9 is a horizontal sectional view of the lance tube support part of the first embodiment of the present invention, FIG. 10 is a sectional view taken along line C-C in FIG. 9, and FIG. 11 is a sectional view taken along line D-D in FIG. 9. 12 is a sectional view taken along line EE in FIG. 11, FIG. 13 is a sectional view taken along line FF in FIG. 11, and FIG. 14 is a sectional view taken along line FF in FIG. 11. FIG. 15 is a plan view of the plywood support portion of the embodiment; FIGS. 16 to 20 are plan views illustrating the operation of the support roller during movement of the lance tube; FIG. 21 1 is a schematic plan view of a roller illustrating the relationship of forces that act during operation in the first embodiment; FIG. 1. Groove beam, 2, 3. Vertical side plate, 4a. 4b...bottom 7 lunge, 5m-rack, 6...drive system,
7. e-lance pipe, 8.. fluid supply pipe, 9.. lance pipe support part or lance pipe support body, 30.. hanging tool, 31, 32
...Bracket, 33.. Furnace wall, 34.. Opening, Ll
e L3...Horizontal part, L2...Descent part, L4
・・Rise part, 35・・Nozzle opening, 50o・Drum, 5
1. fist bearing, 52. drum-shaped roller, 53. fist support roller, 54. protrusion, 56. bearing, 60.
61・Side plate, 62, '630・Side plate, 64・O bottom plate,
65... Upper plate, 70, 71, 72... Contact point, 1oO,
101...Bottom strong rail, 102, 103--Top rail, 104, 10
5--Auxiliary plate, 106,107 fist-driver support roller,
108...axis, 109.110 0.binion, 111
Fist/gear, 112...shaft, 113...gear, 115...
・Key 116・0 stop 200, 201 e・Roller, 202・・Gauge, 203・・Support pin, 204
・・Screw, A, B@・Nozzle, Sl・O movement range without rotation, S2 ・・range that forms a spiral air passage, S3 ・・movement range without rotation, 205, 206 ・・flat part, 20
8... Arc-shaped slot, 209... Screw, 301
Bottom plate, 311... Lower flat plate, 312... Flat plate, 313
・・Flat plate, 316・・Through hole, 317・・Pin, 318
, 319, 320, 321... stopper, 325, 32
6,327,328 @・Auxiliary roller, 323・・Lubrication surface, 400・・Drum-shaped support roller, 401° 402・・Bearing, 420・Fist intersection, 421,4220・Point, Fo,
F♂: Resultant force due to ejection motion and rotational motion acting on the lance tube. Figure 5 Figure 6 (Reference 12 D Port Figure 14 Figure 16 Leap Figure 17 Figure 16 %f9 Related Figure 20

Claims (1)

[Claims] The support roller of the lance tube support body is composed of one rotatable drum-shaped roller that supports the 2-spring tube from below, and this rotatable drum-shaped roller is installed on a plywood board that can rotate in a horizontal plane. A suit blower featuring