JPS59205519A - Soot blower - Google Patents

Abstract

PURPOSE:To prevent excessive bending stress from developing on a lance pipe and at the same time ease the mounting accuracy by a structure wherein rollers provided on an auxiliary supporting device are made so as to be able to follow up the spiral loci made by a lance pipe. CONSTITUTION:Rollers 507 and 525 are supported rotatably. The inclination angles of shafts 601 and 600 are selected so that the straight lines obtained by projecting the shafts 601 and 600 on a plane parallel to a flat plate 599 in the direction of the arrow A are nearly at right angles to the spiral figure produced by a lance pipe 7. Concretely, 603 and 604 are figures obtained by projecting the shafts 601 and 600 on a plane parallel to the flat plate 599 and straight lines (l) and (m) are spiral loci made by the lance pipe 7 and straight lines (n) and (o) are parallel to the figures 603 and 604 and yet the straight lines (l) and (m) are rendered to intersect the straight lines (n) and (o) nearly at right angles. The outer surfaces of the rollers 507 and 525, which are rotatably mounted about the shafts 601, 600, are made smooth according to a spindle-shaped curve so as to be able to rotatingly follow-up smoothly to the spiral locus produced by a certain fixed point on the lance pipe 7.

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. An auxiliary support mechanism is provided to prevent undesirable sagging of the lance tube 7 or sag of the feed tube 8. Furthermore, this intermediate auxiliary support mechanism is Ll, L2, L3, and L4 in FIG.
The support height of the lance tube 7 is determined by taking into consideration the displacement of the lance tube 7 in the vertical direction formed in the section.

When the lance tube 7 is fully retracted, the auxiliary support mechanism is moved as shown in FIGS. 2 and 3 to prevent the lance tube 7 from hanging down.
It is configured such that it can be held by a pair of rollers 300 and 301 while holding the feeding tube 8 inside at the position shown in the figure. The rollers 300, 301 are mounted on the bed plate 302 on an axis with an inclination that corresponds to the helical pinch of the movement of the lance tube 7, the cylindrical surface of the roller being able to rotate freely during the movement of the lance tube.

When the drive system 6 and the lance tube 7 move forward from the maximum retracted position through the movement section corresponding to the section L,1 (during which support of the lance tube 7 is required), the rollers 300.
Before the downward movement of the drive system along the sloped portion L2, which imposes an undesirable load on the roller 301 and its supporting structure,
．． 301 remains in the raised position, but before the drive train 6 reaches the downwardly inclined portion L2, the rollers 300, 301 and their support mechanism automatically move vertically downwards, and the subsequent drive train 6 and during the forward movement of the lance tube 7 the desired amount of feed tube 8
Do not obstruct the downward movement of. This downward movement of the auxiliary support mechanism and rollers prevents interlocking of the drive system 6, and the drive system 6 advances to the position shown in FIG.
stands out completely.

When the lance tube approaches the most protruding position, the center portion of the feed tube is in the downwardly moved position and hangs down due to gravity until it approaches the plywood 302. The lateral beams 303 of the auxiliary support device limit the downward hanging of the feed pipe, and the drive system 6
and lance tube 7 are located on the right side in FIG. Base plate 302
is supported at the end of an arm structure 304, which is deviated from the central plane of the channel beam 1 and perpendicular to the lance tube 7 and the feed tube 8, as shown in FIG. It is arranged like this.

The other end of the arm structure 304 is provided with a hub 305, which is supported by a bracket 306. It is fixed to section 308.

The arm 309 is located near the left inner part of the grooved beam 1, and the shaft portion 30
8 and the arm 309 is attached to the link 310.
This arm 311 is attached to a yoke 313 supported so as to be movably linked to a bracket 312 fixed to the upper surface of the bottom part 4 at a position spaced apart from the rear of the bracket 306.

Arm 311 is swingably supported by shaft 314 and forms an integral assembly with yoke 313 , and arm 311 and yoke 313 are swingable about shaft 314 within bracket 312 . Link 310 is connected to arm 309.311 by axle 315.316. The arm 311 restricts the swinging movement of the yoke 313 on the upper surface of the flange 4,
Each part is constructed so that when the yoke is swung counterclockwise to the limit of its movement (FIG. 2 solid line), the connection line between the axes 315 and 316 formed by the axes of the link 31 (l)
It is arranged so that it is located under the axis of 4.

This causes the weight of the baseplate 302, rollers and related parts to the right of the shaft section 308 to be reduced by the weight of the yoke 313 and the arm 309.
The resultant tension on link 310 holds the roller in the raised position as it is pressed towards the solid line position and held in the solid line position.

The arm 317 attached to the side of the drive system 6
as it moves forward, it enters the open slot 318 in the end of the yoke 313 and swings the yoke clockwise to raise the link 310 over the axis of the shaft 314, thereby 302 downward to the position indicated by the dotted line.

The downward movement of the feed tube is then limited only by the support member 303, which prevents excessive drooping of the feed tube, but also by the front sloped portion L4 and the front roller (lance tube support 9). For overall action, when the drive train 6 tilts upward, it allows the feed pipe to move downward until it is angularly displaced near a position parallel to the drive train 6. Therefore, the feed pipe and the drive train This prevents undue wear and friction between the packings of No. 6.

The rollers 300 and 301 attached to the base plate 302 are
The bins 323 and 324 are rotatably mounted on the base plate 302, and other bins 319 and 320 are attached, which are arranged in arc-shaped holes 32 provided in the base plate 302.
1.322 and can be rotated around the bins 323.324 and fixed to accommodate different pinch spirals by tightening the quilt.

The demand for energy saving has become louder than before, and coal-fired boilers have increased in size, with capacities ranging from 10,100 to 1,200.
The current situation is that MW is becoming larger, and there are even talks of 1500 MW. However, such a doll coal-fired boiler requires a sous umblower with a longer lance tube and feed tube than conventional ones because the space between the furnace walls is wide.

In this way, in suit blowers with long lance tubes and feed tubes, the lance tubes and feed tubes are long, so the amount of sagging becomes large. As a result, the deflection becomes large, and the cavity formed by the boiler tube needs to be enlarged. In order to make the cavity formed by this boiler tube as small as possible, the distance between the parallel parts L1 and L3 in FIG. 1 must be increased.

In this case, the conventional method has the following drawbacks.

That is, FIG. 4 and FIG. 5 are diagrams when the drive system 6 is located in the parallel portions L1 and L3. In this reposition, the vertical position of the lance tube 7 is such that the center lines are separated by the distance of the parallel parts L, 1 and 1.3. Therefore, if a plurality of auxiliary support devices for the lance tube 7 are attached in this state, the plurality of auxiliary support devices for the lance tube 7 are attached to a straight line connecting the lance tube 7 to the drive system 6 and the lance tube support portion 9. It cannot be supported above.

This is because, in the conventional structure as shown in FIG.
(not visible in the figure), 301 needs to rotate around the bin 308 to reach the position where it supports the lance tube 7.

If the bracket 306 and bracket 1-312 are too far apart, the lance tube 7 will fall too far below the predetermined position as shown in FIG. 7, and the roller 301 and lance tube 7 will be Rather than contacting in parallel, the rollers 301 contact the corners of the rollers as at point A in FIG.

This is because the brackets 306 and 307 are installed close to each other (because the yoke 313 is moved by the heat-sensitive member 317 attached to the drive system 6 and the arm 304 is pulled up). The auxiliary support device means that the lance tube 7 cannot be supported in a horizontal position.

The fact that the lance tube 7 cannot be supported on the straight line formed by the two points of the drive system 6 and the lance support part 9 causes excessive bending stress on the lance tube 7 and at the same time reduces the trajectory that the conventional lance tube can draw. Because there are two bearings, for example, a turbine loaf supported by two bearings is plastically deformed and bent by the action of gravity, and if it is not warmed up before starting the amplifier, it will be plastically deformed so as to generate excessive vibration. When the lance tube is protruded into the boiler and retracted, there is a high possibility that the lance tube will vibrate with a large amplitude, endangering the safety of the boiler tube.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and when the lance tube of a suit blower is retracted to an appropriate length, the lance tube is supported at a predetermined height at a plurality of points, When the lance tube protrudes into the boiler furnace to an appropriate length, an auxiliary support device that moves downward and does not restrict the movement of the drive system is used to create a spindle-like curved surface with a clear outer surface. It has a pair of rollers that support the lance tube, and has axes that are perpendicular to the longitudinal direction of the lance tube and tilted from a horizontal plane, respectively. By making it possible to follow the plurality of spiral trajectories drawn by the lance tube by rotating the pair of rollers on the horizontal plane without changing the relative positions of the pair of rollers so as to be substantially perpendicular to the trajectory of the spiral drawn, Make sure that excessive bending stress does not occur in the lance tube, and
It is an object of the present invention to provide a soot blower that can reduce the blowing accuracy compared to conventional ones.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 8 shows a suit blower showing an embodiment of the present invention, in which the lance tube drive system 6 is at the rearmost position (when the lance tube 7 is retracted the most). A schematic diagram of each component is shown when occupying the .

In the figure, 1 indicates a groove-shaped beam of the soot blower, 5 indicates a track attached to the groove-shaped beam 1, and a drive system 6 moves back and forth along the track 5 when the lance tube 7 protrudes and retracts.

Further, the lance tube 7 is given forward and backward movement and rotational movement by the drive system 6. On the other hand, the fluid supply pipe 8 is fitted into the lance pipe 7 in a position in the drive system 6 so as to be freely inserted and removed, but is fixed to the valve 10 at one end and cannot move forward or backward or rotate.

9 is a lance tube support attached to the tip of the grooved beam; 499 is a circular tube installed on the lance tube support 9; the lance tube 7 passes through this circular tube and moves forward and backward; The lance tube 7 can be moved and rotated, and the lance tube 7 can be supported at a desired vertical or horizontal position by cooperation with the drive system 6.

500 and 501 are retaining plates of the auxiliary support device attached to the channel beam 1 by welding or bolts, which retaining plates are provided with bearings about which the first arm 509.508 rotates. and a pair of rollers 525.504 and 526.507 (504, 5
07 (not visible) to hold the lance tube 7 on a straight line determined by two points: the drive system 6 and the circular tube 499 of the lance tube support 9.

In this case, since the feed tube 8 is fitted into the lance tube 7, the auxiliary support device holds the lance tube 7 and the feed tube 8 at the same time. FIG. 9 shows a case where the drive system 6 moves to the tip of the grooved beam 1 and the lance tube 7 protrudes far into the boiler, and the arm 50 of the auxiliary support device that holds the lance tube
8.509 falls down from the position shown in FIG.
26 = 525 no longer supports lance tube 7 and feed tube 8.

In this case, since the lance tube 7 protrudes, the feed tube 8 fitted into the lance tube 7 becomes shallowly fitted (but has a length that will never come off). 9. It hangs down due to gravity.

In order to prevent this feeding pipe from hanging down excessively, to prevent excessive stress from being generated in the feeding pipe, or to prevent damage to the packing at the fitting part with the lance pipe 7, the grooved beam 1 is , hangs down onto the bolted feed pipe support device 510, 511, 512 and serves to limit further hanging of the feed pipe.

The two auxiliary support devices are connected by a cable 502 (which may also be a rod), and the length of the cable 502 is adjusted by an adjusting pad 505 to a desired distance.

FIG. 10 is a diagram of two auxiliary supports (ie, front and rear auxiliary supports). In FIG. 10, two auxiliary support devices are shown to be interlocked, but it is also possible to install three or more auxiliary support devices so that they are interlocked.

500 and 501 indicate a vertical flat plate welded to the side surface 2 of the channel beam 1, and an axis 513. installed on this flat plate.
A first arm 508, 509 and a second arm 515, 516 are rotatable around 514, respectively. The roller 525 is in direct contact with the lance tube 7, as shown in FIG. 10, and serves to smooth forward, backward, and rotational movements of the lance tube 7.

Figures 11 and 12 show the rollers mounted on the first arm 508, 509 (other parts are omitted for structural clarity). Furthermore, since the left and right auxiliary support devices in FIG. 10 have substantially the same functions, the left auxiliary support device will be described.

In FIG. 11, reference numeral 514 indicates an axis around which the first arm 508 can freely rotate;
As shown in FIG. 2, together with the flat plate 599, it has a gate-shaped shape.

On a flat plate 599 provided on the upper part of this first arm 508 is a shaft 6 that rotatably supports rollers 507 and 525.
01 and 600 are the first arms 50 arranged in the vertical direction
8 and the horizontally arranged flat plate 599 are provided in an inclined direction.

However, the extensions of the two axes 601 and 600 are configured to form parallel lines.

In addition, the inclination angle of these two axes 601.600 is from the direction of the arrow (vertical direction) to the axis 601.6 in FIG.
00 onto a plane parallel to the flat plate 599 and the spiral shape drawn by the lance tube 7 are selected so as to be approximately at right angles.

That is, as shown in FIG.
This figure is created by projecting 01.600 onto a plane parallel to the flat plate 599. Straight line 1. m is the locus of the spiral drawn by the lance tube 7, straight lines n and o are parallel to the projection axes 603 and 604, and straight lines 1 and m intersect with n and 0 at approximately right angles.

The surfaces of rollers 507 and 525, which are rotatably mounted around the axes of these shafts 601 and 600,
As shown in FIGS. 1 and 12, for example, the outer surface is made to form a smooth spindle-like curve. Note that ball bearings and thrust rings are provided between the rollers 507, 525 and the shafts 601, 600 to maintain smooth rotation, but detailed explanation thereof will be omitted. For this reason, the IJ! drawn by one point of the lance tube 7!
J! Do not allow the rollers 507 and 525 to rotate smoothly following the turning path and cause an obstruction to the movement of the lance tube 7.
do not have.

As described above, since the roller provided in the auxiliary support device of the present invention has a spindle-like curved surface with a smooth outer surface, excessive shear is applied to the lance tube, as shown in FIGS. 6 and 7 of the conventional example. There is no stress or bending stress, and the mouth ~
Since the lance tube only needs to be in contact with the surface of the lance tube somewhere on the curved surface of the lance tube, there is no need to worry about the accuracy of the installation.

In addition, for different trajectories of the lance tube≠, as shown in the dashed line in FIG.
A flat plate 610 having an arc-shaped opening 612 and a circular hole 614 different from the above is installed, and the bottle 611 provided on the flat plate 599 is fitted into the hole 614, so that the flat plate 610 rotates around this pin 611. This can be achieved by tightening the gilt 613 that passes through the arc-shaped opening 612 at a desired position.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional soot blower, Figure 2 is a detailed view of the main parts, Figure 3 is a front view of the same, and Figures 4 and 5 show the drive system in parallel parts 1, 1 and L3. Side view when installed, No. 6
7 and 7 are explanatory diagrams of the case where the lance tube shown in FIG. 3 is supported by rollers, FIG. 8 is a side view of a suit blower showing an embodiment of the present invention, and FIG. 9 is similar to FIG. 8. 10 is a detailed view of the front and rear auxiliary support devices in FIG. 8; FIG. 11 is a side view showing the lance tube supported by a pair of row arms; FIG. 12 is a side view showing different operating states; The figure is a front view of the same, and FIG. 13 is a projection view of the same roller onto a horizontal plane. Explanation of main parts of the figure 1 Beam 6 - Drive system 7 - Lance pipe 8 - Feeding pipe 507, 525 - Roller 508, 509 - Arm 5
99, 610-flat plate 600, 601-shaft 603
．． 604-Axes of projection 1, m, n, o - Straight lines intersecting at right angles Fig. 4 L/-2 - L2 Fig. 6 Fig. 5 L2 + L, - day 14

Claims (1)

[Claims] To ensure that the suit blower's lance tube is pulled in to an appropriate length, the lance tube is supported at a predetermined height at multiple points.
When the lance tube protrudes into the boiler furnace to an appropriate length, a pair of auxiliary support devices that move downward and do not restrict the movement of the drive system are installed, each having a spindle-like curved surface with a smooth outer surface. The rollers that support these rollers have shafts that are perpendicular to the longitudinal direction of the lance tube and tilted from the horizontal plane, respectively, and the shapes formed by projecting the coaxes onto the horizontal plane are approximately parallel to each other, and the spiral drawn by the lance tube It is characterized by being able to follow a plurality of VL circular trajectories drawn by the lance tube by rotating the pair of rollers substantially at right angles to the locus of the lance tube and rotating the pair of rollers on the horizontal plane without changing their relative positions. suit blower.