JPH0763320A - Soot blowing device - Google Patents

Abstract

PURPOSE:To reduce the movement stroke of a lance pipe and to reduce the size of the device by a method wherein the lance pipe is reciprocatingly movable in the axial direction by a distance slightly longer than the distance between injection nozzles and the movement/rotation control device is inserted in a predetermined position into the body of a heat-exchanger rotatably around the axis. CONSTITUTION:A soot blowing device comprises a lance pipe 7 having an injection nozzle 6, and a moving means axially reciprocatively moved in a state that the lance pipe 7 is inserted in a body 1 of a heat-exchanger having a heat-exchanger tube 2 in the direction at right angles to the lance pipe 7. A plurality of injection nozzles 6 disposed an intervals being a plurality of times as large as the distance between the heat-exchange tubes 2 are arranged on the lance pipe 7 throughout a range of from the tip to the rear. Further, the movement/rotation control device is provided for inserting the lance pipe 7 in a predetermined position into the body 1 of the heat-exchanger axially reciprocatingly movably by the distance slightly longer than the distance between the injection nozzles 6 and rotatably around the axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inserts a lance tube having a nozzle into a heat exchanger such as a boiler and injects a soot blowing medium from the nozzle to clean the surface of the heat exchange tube. It relates to a soot blowing device.

[0002]

2. Description of the Related Art As a conventional example, FIG. 5 shows a vertical cross section of the entire structure of a soot blowing device 3 called a slip-on type soot blowing device. Figure 5
In a soot blower, for example, a boiler furnace 1
Inside, a large number of heat exchange tubes 2 forming a boiler tube are arranged in parallel and at a predetermined interval.
A wall box 1b for introducing the lance pipe 7 of the soot blowing device 3 is provided outside the a.

The soot blowing device 3 has a casing 5 supported by a support frame 4 and a wall box 1b, a lance pipe 7 inserted into the casing 5 and having a soot-blowing nozzle 6 at its tip, and this lance. A moving geared motor 8 is used as a moving mechanism for horizontally moving the tube 7 in and out of the furnace 1.
A rotation geared motor 9 as a rotation mechanism, one end fixedly supported by a valve 14 attached to the casing 5 in a cantilever shape, and the other end coaxially loosely inserted in the lance pipe 7. And a supply pipe 10 as a supply unit of the injection medium.

The lance tube 7 has a support roller 1 having a plurality of tips.
1, and the rear end portion is supported by the guide roller 13 via the gear box 12. Also, the supply pipe 10
The valve 14 for supplying the soot-blowing injection medium to the supply pipe 10 also serves as a fixing portion for fixing one end of the valve. The valve 14 is opened and closed via the moving gear box 12. This is done by activating 15.

The rotating geared motor 9 has a square shaft 16
Is connected to the gear box 12 through the rotation of the geared motor 9 for rotation so that the lance tube 7 is rotated by way of the angular shaft 16 and the gear box 12. Rotate at the same speed.

A rotation detecting dog 17 is attached to the tip of the square shaft 16, and when the square shaft 16 makes one rotation, the rotation detecting limit switch 18 operates due to the contact of the rotation detecting dog 17. The rotation geared motor 9 stops, and the rotation of the lance tube 7 stops.

The moving geared motor 8 includes a casing 5
Gear box 1 via a chain 19 for movement installed along
The rotation of the geared motor 8 for movement is transmitted to the gear box 12 via the movement chain 19, and the lance tube 7 reciprocates as the gear box 12 moves.

A plurality of intermediate stop dogs 20 are horizontally installed on the upper wall of the casing 5 in a downward posture at the same intervals as the intervals a of the heat exchange tubes 2 in the furnace 1, and the gear box 12
Is configured to be engageable with the intermediate stop limit switch 21 provided on the upper part of the.

The lance tube 7 moves together with the gear box 12,
When the nozzle 6 at the tip end thereof reaches an intermediate position between the heat exchange tubes 2, the intermediate stop limit switch 21 on the gear box 12 sequentially comes into contact with the intermediate stop dog 20 to operate, thereby moving the geared motor 8 for movement. To stop the movement of the lance tube 7. The movement / rotation control device 22 is constituted by the members from the rotation detection dog 17 to the movement stop limit switch 24.

Further, the casing 5 is provided with a retreat limit switch 23 and a stop limit switch 24 at predetermined intervals, and the movement ranges of the gear box 12 and the lance pipe 7 are restricted by these limit switches 23 and 24. , Forward and backward movements are controlled.

In this apparatus, at the starting position shown by the solid line in FIG. 5, the nozzle 6 is located at the point A in the wall box 1b, and from this position, first, the moving geared motor 8 is driven to move the chain 19 for moving. When the nozzle 6 reaches the point B in the furnace 1 at the same time when the gear box 12 and the lance tube 7 start to move forward via the guide roller 13, the guide roller 13 operates the opening / closing device 15 at the same time, whereby the valve 14 is opened and the injection is performed. The medium is supplied to the lance pipe 7 via the supply pipe 10, and the ejection from the tip end nozzle 6 thereof starts.

The lance tube 7 is further advanced and the nozzle 6 is moved to B '.
When the point (the midpoint between the first heat exchange tubes 2) is reached,
The intermediate stop limit switch 21 engages with the first intermediate stop dog 20 to operate, stops the moving geared motor 8, stops the movement of the lance tube 7, and simultaneously drives the rotating geared motor 9, The lance tube 7 starts to rotate, the injection medium is injected into the intermediate portion between the heat exchange tubes 2, and the soot blowing operation is performed.

When the lance tube 7 makes one revolution, the square shaft 1
The rotation detection dog 17 at the tip of 6 rotates once, the rotation detection limit switch 18 operates to stop the rotation geared motor 9, and stops the rotation of the lance tube 7 and at the same time drives the movement geared motor 8. Then, the lance tube 7 restarts its movement.

When the lance tube 7 moves, the nozzle 6 jets in a direction parallel to the heat exchange tube 2, and the jet center does not hit the heat exchange tube 2.

Subsequently, when the lance tube 7 is further advanced by the distance a and the intermediate stop limit switch 21 is engaged with the second intermediate stop dog 20b, the moving geared motor 8 is stopped again and the lance tube is stopped. The movement of 7 is stopped, the geared motor 9 for rotation is driven at the same time, the lance tube 7 is rotated again, the injection medium is injected into the intermediate portion between the second heat exchange tubes 2, and the soot blowing operation is performed. .

Similarly, when the nozzle 6 reaches the point C after performing the soot blowing operation up to the point C ', the gear box 12 reaches the point E, and the guide roller 13 retracts the limit switch 23 for backward movement.
Is operated, whereby the moving geared motor 8 is reversely driven, and the lance tube 7 begins to retract. During this retreating operation, the intermediate stop limit switch 21 does not operate, the lance tube 7 does not rotate, and the lance tube 7 retreats at once, and when the nozzle 6 returns to point B, the guide roller 13 reversely operates the valve opening / closing device 15. Then, the valve 14 is closed and the injection of the injection medium is stopped. After this, when the nozzle 6 returns to the point A, the gear box 12 returns to the point D, the guide roller 13 operates the stop limit switch 24, the moving geared motor 8 stops, and the whole operation ends. .

The above is an example of the apparatus for cleaning while moving the lance pipe 7 having the nozzle 6 only in one place in the entire horizontal direction in the furnace 1. However, in addition to this, conventionally, stationary rotary soot is also used. There was a device called a blowing device, as shown in FIG.

In this apparatus, nozzles 6 are provided on the lance pipe 7 in a number corresponding to the space between the heat exchange tubes 2.
The lance tube 7 is rotated and not horizontally moved to inject and wash the injection medium.

[0019]

The above-described conventional soot blowing device has the following problems to be solved.

That is, in the conventional apparatus shown in FIG. 5, the lance pipe 7 expands and contracts the nozzle 6 at its tip from the position in the wall box 1b to the position on the opposite side of the furnace wall 1a in the furnace 1 to the full width of the furnace. It is necessary to do so, soot device 3
Is a very large device having a long casing 5, a supply pipe 10 and a lance pipe 7, and there is a problem that a large installation space must be taken.

Further, although the conventional apparatus shown in FIG. 6 does not require the movement of the lance tube 7, the number of nozzles 6 is very large, so that the proper injection amount and injection pressure per nozzle are maintained. Has to prepare a very large and high-pressure pump and other pumping equipment, and accordingly, management of leakage measures and other maintenance is also required to be sophisticated, and equipment costs and operating costs increase. There is.

The present invention has been made in order to solve such a conventional problem, and an object thereof is to provide a soot-blowing device of a small size and a small space by reducing the movement stroke of the lance tube.

[0023]

As a means for solving the above problems, the present invention provides a lance tube having an injection nozzle, and a lance tube in a main body of a heat exchanger having a heat exchanger tube in a direction orthogonal to the lance tube. A moving unit that inserts and reciprocates in the axial direction, a rotating unit that rotates the lance tube around the axis, a supply unit that supplies an injection medium for soot blowing to the lance tube, and the injection nozzles each generate heat. When the intermediate position between the exchanger tubes is reached, the axial movement of the lance tube is stopped to rotate around the axis, and after the set rotation, the rotation of the lance tube is stopped and the axial movement of the lance tube is performed. In a soot blowing device having a movement / rotation control device for controlling the movement, a plurality of injection nozzles are arranged on the lance pipe from the tip to the rear at intervals of a plurality of intervals (pitch) of heat exchange tubes, and the lance. Pipe the jet nozzle A soot blowing device comprising: a movement / rotation control device that is fixedly inserted into the body of the heat exchanger so as to be reciprocally movable in the axial direction by a distance slightly larger than the distance and rotatable about the axis. , Is intended to be provided.

[0024]

Since the present invention is constructed as described above, it has the following actions.

That is, a plurality of injection nozzles, which are arranged on the lance tube from the tip to the rear at a plurality of intervals of a plurality of intervals of the heat exchange tubes, move inside the main body of the heat exchanger by the movement / rotation control device. Since it can move along with the lance tube in the axial direction by a distance slightly larger than the distance between the injection nozzles and can rotate around the axis, all the heat exchange tubes included in the considerable distance between the adjacent injection nozzles can be washed. . Therefore, all the heat exchange tubes between the nozzles, which are arranged from the tip to the rear, are washed.

That is, it is possible to clean the entire heat exchange tube with a shorter moving distance of the lance tube than the conventional example shown in FIG.

On the other hand, since the number of injection nozzles can be made much smaller than that of the conventional example shown in FIG. 6, the injection amount of the injection medium required for the injection per unit time and the steady injection pressure become very small, and accordingly, the corresponding amount. Cleaning can be achieved with small equipment and low cost.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. It should be noted that the same members as those of the conventional example and members having the same function, such as only different lengths, are designated by the same reference numerals, and the description thereof will be omitted unless necessary.

FIG. 1 is a vertical cross-sectional view showing an essential part of this embodiment, FIG. 2 is a cross-sectional view showing an example of a nozzle provided in the lance pipe of this embodiment, and FIG. 3 is a view showing the lance pipe of this embodiment. FIG. 4 is a view showing an example of a support for supporting the lance tube according to the present embodiment, and FIG.

As shown in FIG. 1, in this embodiment, the lance tube 7 of the soot blowing device 3a has the tip of the lance pipe 7 pulled into the soot blowing device 3a, and the tip of the lance pipe 7 is in the furnace 1. The length of the heat exchange tube 2 is set to a space that is a multiple of the pitch a (i.e., 3 to 4 times the space a + [alpha]) with the opposite furnace wall 1a.

On the lance tube 7, a plurality of injections are made from the tip of the lance tube 7 to the rear at a distance interval of 3 to 4 times the interval a of the heat exchange tube 2 in accordance with the interval between the tip of the lance tube 7 and the furnace wall 1a. A nozzle 6 for use is provided.

The nozzle 6 portion of the lance tube 7 is of a nozzle type that does not project to the outer surface of the lance tube 7 as shown in FIG.
Further, the length of the lance tube 7 which is held in a state of being fixedly inserted in the furnace 1 is fixed to the heat exchange tube 2 as shown in FIGS. 3 and 4, or a required number of supports fixed to the furnace wall. 7a
It is movably supported in the axial and rotational directions.

In FIG. 1, a is a horizontal interval between the heat exchange tubes 2, A is a stop position of each nozzle 6 on the lance tube 7 when the lance tube 7 is pulled in, and B, B ', B "are lance tubes 7. The intermediate position between the heat exchange tubes 2 at three positions where the nozzles 6 move forward to reach each nozzle in sequence, C is the intermediate position B ″ between the last heat exchange tubes 2, and the lance tube 7 is retracted by a distance α. It is a movement stop position for.

On the other hand, on the soot blowing device 3a side, D, E,
E ′, E ″ and F are stop positions A when the lance pipe 7 is retracted, and intermediate positions B between the three heat exchange tubes 2.
B ', B "and a position in the casing 5 at intervals corresponding to the backward movement stop position C. The casing 5 of the soot blowing device 3a uses the distance positions D to F as the lance tube movement range to move the geared motor. 8, rotating geared motor 9,
The moving chain 19, the square shaft 16, the gear box 12, the injection medium supply automatic valve 14, the supply pipe 10, and other members are attached and configured.

A stop limit switch 30 is provided on the lower surface of the casing 5 so that the gear box 12, the lance pipe 7 and the like are brought to a return stop by engaging with the guide roller 13 below the gear box 12 on the line D, and 31 is also the same. Guide roller 1 with the above F line
3 is a limit switch for retreating to engage with 3 to start retreating, 32 to 34 are intermediate stop dogs provided on the intermediate stop positions E to E ″ between the three heat exchange tubes 2, 35
Is a gear box 1 which can be engaged with the intermediate stop dogs 32 to 34.
2 It is a limit switch for intermediate stop provided on the upper part.

The wall box 1 on the furnace wall 1a
b, the rotation detecting dog 17 at the end of the square shaft 16 and the rotation detecting limit switch 18 engaging with the dog 17 are provided as in the conventional case. And under this structure, the lance tube 7
The movement / rotation control device 22 is composed of each member from the rotation detection dog 17 to the intermediate stop limit switch 35 in the order of codes.

Next, the operation, that is, the operation of the soot blowing device 3a described above will be described. When the sootblower 3a is at rest, as shown in FIG. 1, the nozzles 6 at the leftmost and rightmost ends (tips) of the lance tube 7 are located at point A in the furnace 1 and the nozzles 6 are parallel to the heat exchange tube 2. The gear box 12
Is located at point D.

In response to the activation signal of the soot blowing device 3a, the moving geared motor 8 is first driven, and the gear box 12 and the lance pipe 7 start moving forward to the right in the figure via the moving chain 19. The stop limit switch 30 is actuated by the movement of the guide roller 13, the injection medium supply automatic valve 14 is switched to the open state, and the injection medium is ejected from the nozzle 6 through the injection medium supply pipe 10 and the lance pipe 7. When the nozzle 6 reaches the point B (the middle point between the first heat exchange tubes 2),
At the same time, the intermediate stop limit switch 35 engages with the first intermediate stop dog 32 to operate the moving geared motor 8 to stop and the rotating geared motor 9 to drive, whereby the lance tube 7 stops moving. Then, the soot is rotated around the axis at the intermediate position B between the first heat exchange tubes 2, and the soot removal work by the injection medium is performed.

When the lance tube 7 makes one revolution, the square shaft 1
The rotation detecting dog 17 at the 6th end makes one rotation to operate the rotation detecting limit switch 18, and accordingly, the rotation geared motor 9 is stopped and the movement geared motor 8 is driven to move the lance tube 7 forward. Resume.

The lance tube 7 is further advanced and the nozzle 6 is moved to B '.
When the point (the intermediate point between the second heat exchange tubes 2) is reached, the intermediate stop limit switch 35 engages with the second intermediate stop dog 33 to operate, and the moving geared motor 8
And the geared motor 9 for rotation is driven to stop the movement of the lance tube 7 and start rotation, so that the jetting medium from the nozzle 6 performs soot removal work at the position B '.

In this way, the soot-removing work at the point B ″ is continuously performed in this manner, and when the nozzle 6 reaches the point C, the soot-blowing device 3
The guide roller 13 operates the reverse limit switch 31 at the corresponding F point position on the a side. As a result, the moving geared motor 8 is reversely driven, and the lance tube 7 begins to retreat to the left in the figure. During the backward movement, the intermediate stop limit switch 35 does not operate, and the lance tube 7 does not rotate but moves backward at once.

Next, when the nozzle 6 returns to the point A, the guide roller 13 operates the stop limit switch 30 at the position of the point D to stop the moving geared motor 8 and close the automatic injection medium supply valve 14. The operation is stopped to stop the injection of the injection medium, and the whole operation is completed.

As described above, according to the soot blowing device 3a of the present embodiment, the stroke of moving the lance tube 7 into the furnace 1 is a multiple of the interval of the heat exchange tubes 2, for example, 3 to 4 of the intervals of the heat exchange tubes 2. It is possible to effectively perform the soot removal work of the entire heat exchange tubes 2 in the furnace 1 with a double horizontal stroke, and at the same time, the soot blowing device 3a itself is about 1/3 of the conventional one.
There is an advantage that the size of the device can be reduced to a shortened length scale of about 1/4 to 1/4. In addition, there is an advantage that a large space is not required for installing the soot blowing device 3a and the effect of reducing the equipment cost can be obtained.

[0044]

Since the present invention is constructed as described above, it has the following effects.

That is, since the present invention allows a small movement of the lance tube and allows a plurality of nozzles arranged at a plurality of locations in the axial direction of the lance tube, the conventional slip-on soot blowing device and the stationary rotary type. The advantages of both of the soot blowing devices are utilized.

That is, the amount of movement of the lance tube can be reduced to about a reciprocal multiple of the value obtained by dividing the distance in front of and behind the heat exchanger by the distance between the nozzles provided in the axial direction of the lance tube. . For example, by appropriately selecting the number of nozzles, the size can be reduced to about 1/3 to 1/4 as compared with the conventional example of FIG.

Further, compared with the conventional example of FIG. 6, the number of nozzles is reduced to, for example, 1/3 to 1/4, so that the injection pressure of the injection medium is correspondingly small, and the pump, etc. Therefore, all of the pumping equipment and the like can be of low pressure and small size.

As a result of the above, the entire apparatus becomes compact and inexpensive,
Moreover, the installation space is small, and maintenance is simplified.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the overall configuration of a soot blowing device according to an embodiment of the present invention,

FIG. 2 is a cross-sectional view showing an example of a nozzle provided in the lance tube of the above embodiment,

FIG. 3 is a view showing an example of a support for supporting the lance tube of the above embodiment,

FIG. 4 is a view showing another example of the support for supporting the lance tube of the above embodiment,

FIG. 5 is a longitudinal sectional view showing a configuration example of a conventional slip-on type sootblower of a heat exchanger,

FIG. 6 is a vertical cross-sectional view showing a configuration example of a stationary rotary soot blowing device of a conventional heat exchanger.

[Explanation of symbols]

 1 furnace (main body of heat exchanger such as boiler) 2 heat exchange tube 3a soot blowing device 4 support frame, 5 casing 6 nozzle 7 lance pipe 7a support 8 moving geared motor 9 rotation geared motor 10 supply pipe 12 gear box 13 Guide roller 14 Automatic valve for supplying injection medium 16 Square shaft 17 Rotation detection dog 18 Rotation detection limit switch 19 Moving chain 22 Movement / rotation control device 30 Stop limit switch 31 Reverse limit switch 32-34 Intermediate stop dog 35 Limit switch for intermediate stop

Claims (1)

[Claims] 1. A lance pipe having an injection nozzle, a moving means for inserting the lance pipe into a main body of a heat exchanger having a heat exchanger tube in a direction orthogonal to the lance pipe, and moving the lance pipe back and forth in the axial direction. Rotating means for rotating the lance tube around the axis, a supply section for supplying the lance tube with an injection medium for soot blowing, and a lance tube when the injection nozzle comes to an intermediate position between the heat exchanger tubes. In a soot blowing device having a movement / rotation control device for stopping the axial movement of the to rotate about the axis and stopping the rotation of the lance pipe after the set rotation to perform the axial movement of the lance pipe, A plurality of injection nozzles arranged on the lance tube from the tip to the rear at intervals of a plurality of intervals (pitch) of the heat exchange tubes, and the lance tube in the axial direction by a distance slightly larger than the interval of the injection nozzles. To and from A soot blowing device, comprising: a movement / rotation control device that is fixedly inserted into the main body of the heat exchanger so as to be rotatable about one axis.