JPH09273737A - Soot blower of retractable type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure and miniaturize the size of a retractable type soot blower, applied for a heat exchanger such as a boiler or the like. SOLUTION: A casing 8 is fixed by the furnace wall 15 of a heat exchanger 12 and a supporting frame 17 while a lance tube 3, having a nozzle 4 at the tip end thereof, is arranged and a supplying tube 2 is penetrated through the lance tube 3 from a head valve 1, supplying injection medium, across the whole length of the tube 3. A traveling carriage 22 supports the end of the lance tube 3 so as to be turnable and supports the supplying tube 2 while the carriage 22 is moved by a guide roller 7 together with the lance tube 3. A gear box 5 is fixed to the upper surface of the casing 8 and a motor 10 is provided to rotate an output pulley 20. The rotary shaft of the output pulley 20 is attached so as to keep an angle between the axis of the lance tube 3 while a belt 21 is suspended between the output pulley 20 and the lance tube 3 whereby the lance tube 3 is turned and moved forward and rearward by the rotation of the belt 21 to inject medium from the nozzle 4 into the heat exchanger 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a slip-on type soot blowing device applied to a heat exchanger such as a boiler.

[0002]

2. Description of the Related Art FIG. 3 is an overall configuration diagram showing an example of a conventional slip-on type sootblower. As shown in the figure, the slip-on type sootblower device injects the injection medium from the nozzle 4 at the tip of the lance tube 3 which reciprocates in the heat exchanger while rotating, and the surface of the tube group in the heat exchanger 12 is ejected. It is a device that blows off the soot and the like that have adhered or accumulated on the tube to improve the heat transfer coefficient of the tube.

As shown in the figure, the slip-on type sootblower is attached to a wall box 16 fixed to the furnace wall 15 of the heat exchanger 12 at the tip side and supported by a support frame 17 at the rear side, and the lance tube 3 is provided. Is installed horizontally in the casing 8. A supply pipe 2 for supplying the injection medium to the lance pipe 3 via the head valve 1 extends inside the lance pipe 3 over substantially the entire length thereof.

The lance tube 3 has a casing 8
The front end is supported by the roller 9 and the rear part is supported by the lance tube 3.
It is supported by a guide roller 7 via a gear box 5'which is integrally mounted with the. A pinion 6 is provided on the upper portion of the gear box 5'and meshes with a rack 11 mounted on the upper wall of the casing 8.

A motor 10 is attached to the gear box 5 ', and when the rotation of the motor 10 is reduced by the gear box 5'and transmitted to the pinion 6, the gear box 5'includes the lance tube 3 and the motor 10. No, it will move laterally along the rack 11. In this case, the gear box 5 ′ seals the supply pipe 2 and slides to hold it. The rotation of the motor 10 causes the gear box 5'to simultaneously rotate the lance tube 3 about its axis. Therefore, the lance tube 3 is
While rotating, it moves forward (or backward) in lateral movement.

The casing 8 is provided with a retreat limit switch 13 and a stop limit switch 14 for restricting the moving range of the gear box 5'and the lance tube 3, and
It controls forward and backward movements.

In the figure, point A indicates the position of the lance tube 3 before starting (or at the end of operation) (corresponding to point D of the gear box 5 '), and point B indicates the start (or injection) of the injection medium. End point, and point C indicates the fully extended position of the lance tube 3 (corresponding to point E of the gear box 5 ').

FIG. 4 is an explanatory view of a free power system for supplying electric power in such a conventional slip-on type sootblower. In the conventional apparatus, since the motor 10 moves together with the gear box 5 ', the power supply to the motor 10 is a free power system as shown in FIG.

In this free power system, the power cord 3 is provided between the terminal box 32 installed in the lower surface of the casing 8 substantially in the center in the longitudinal direction and the clamp 33 attached to the gear box 5 '.
The power cord 30 extends from the clamp 33 to the motor 10. A U guide 31 that supports the power cord 30 is provided over substantially the entire length of the lower surface of the casing 8 in the longitudinal direction.

In such a free power system, the power cord 30 has a length of L / 2 from the terminal box 32 in the central portion and has a length of L / 2 from the central terminal box 32 as shown in FIG. When the motor 10 moves together with the gear box 5 ', the power supply coat 30 moves in the U guide 31 as shown in FIG. 7B, and the power supply cord L reaches the right end on the opposite side as shown in FIG. It can be moved with a length of / 2. Therefore, the power cord 30 is pulled along with the movement of the gear box 5 ′, moves in the U guide 31, and stably supplies electric power to the motor 10.

[0011]

In the conventional slip-on type sootblower as described above, the motor 10 and the gear box 5'move together, and the gear box 5'has a motor 10a.
Since the lance tube 3 is attached, the structure becomes large, and since the free power system for power supply is built in the casing 8, the size of the casing becomes large, the structure is complicated, and the number of parts is large. . further,
The moving means of the gear box 5'is complicated and the manufacturing cost is high.

The present invention solves these problems, fixes the gearbox, and drives the rotation and movement of the lance tube by means of an inclined belt, which simplifies the structure, downsizes it, and makes it economical. An object is to provide a differential soot blowing device.

[0013]

In order to achieve this object, according to the present invention, a casing having one end fixed to a furnace wall of a heat exchanger and a soot body supply pipe which is arranged inside the casing and is inserted through the casing And a lance tube having a nozzle at the tip, and the lance tube is reciprocally moved in the axial direction while rotating, and is inserted and removed from the casing end into the heat exchanger,
A slip-on type soot blowing device configured to inject an injection medium supplied via the supply pipe into the heat exchanger from the nozzle, and a gear box arranged in the casing and the same gear box. An output pulley connected to a reduction gear driven by a provided motor, and an axial direction of the output pulley and the longitudinal direction of the lance pipe are inclined, and the output pulley is bridged between the pulley and the lance pipe. There is provided a slip-type soot blowing device comprising a belt, and the lance tube is simultaneously moved in the axial direction while being rotated by the belt.

According to the slip-on type soot blowing device of the present invention, while the lance tube is rotated, the lance tube is moved forward or backward in the axial direction to be inserted into or removed from the heat exchanger, and the injection medium supplied via the supply tube is lanced. Soot is blown from the nozzle of the tube into the heat exchanger.

At this time, a lance tube that performs a rotating operation and a forward or backward moving operation in the axial direction at the same time is connected to a gear box attached to a casing so that the lance tube can reciprocate in the axial direction while rotating the lance tube. The output pulley and the lance tube are tilted to span the belt, and the belt directly transmits the rotational force to the lance tube. The rotational force can be applied simultaneously with the rotational movement and the axial forward or backward movement movement by mounting the belt with an inclination with respect to the longitudinal direction of the lance tube.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a slip-on type sootblower according to an embodiment of the present invention, FIG.
FIG. 3 is a view on arrow XX in FIG. 1. In these figures, the same parts as those in FIGS. 3 and 4 of the conventional example are denoted by the same reference numerals, duplicate explanations will be omitted, and the characteristic parts of the present invention will be described with reference to the same parts.

A gear box 5 is attached to the upper part of the casing 8, and the gear box 5 is provided with a motor 10 for driving the reduction gear and an output pulley 20 on the output shaft of the reduction gear. A belt 21 is stretched between the output pulley 20 and the outer peripheral surface of the lance tube 3, and the belt 21 has a rotation center of the output pulley 20 at an angle with respect to the longitudinal direction of the lance tube 3, as shown in FIG. It is attached so that it becomes α.
The belt 21 may be attached by winding it around the outer surface of the lance tube 3.

One side of the supply pipe 2 and the lance pipe 3 is supported by a traveling carriage 22. The traveling carriage 22 rotatably supports one end of the lance pipe 3 to seal the supply pipe 2 and slide it. The lance tube 3 is reciprocally movable in the casing 8 according to the forward or backward movement of the lance tube 3 in the axial direction.

The lance tube 3 is supported on one side by the traveling carriage 22 and on the other side by a belt 21 suspended from the output pulley 20. Then, the rotation of the motor 10 is decelerated by the gear box 5 and transmitted from the output pulley 20 to the lance tube 3 via the belt 21.

As described above, the belt 21 is attached so as to be inclined with respect to the lance tube 3, and the inclination angle α is, as shown in FIG. 2, the rotational axis direction of the output pulley 20 relative to the longitudinal direction of the lance tube 3. It is attached at an angle α. And
When the inclination angle α is larger than 0, the rotation operation and the lateral movement operation of the lance tube 3 are simultaneously performed according to the angle α, and the inclination angle α is usually set in the range of 20 to 60 degrees.

The casing 8 is provided with a reverse limit switch 13 and a stop limit switch 14 for controlling the movement range of the lance tube 3 and the traveling carriage 22 and controlling the forward and backward movements. .

In the figure, point A shows the position of the lance tube 3 before starting (or when operation ends) (corresponding to point D of the traveling carriage 22), and point B starts the injection of the injection medium (or stops the injection). ) Indicates the position, and point C is the extension position of the lance tube 3 (corresponding to point E of the traveling carriage 22)
Are respectively shown.

In the slip-on type sootblower having such a structure, the motor 10 is driven to move the lance tube 3 forward and backward in the axial direction while rotating the lance tube 3 so as to be inserted into and removed from the heat exchanger 12. The jet medium supplied to the lance pipe 3 is jetted from the nozzle 4 of the lance pipe 3 into the heat exchanger 12 to perform soot blowing.

At this time, the rotational movement and the reciprocating movement of the lance tube 3 are such that the output pulley 20 driven by the motor 10 of the gear box 5 and the lance tube 3 are inclined by an angle α to the belt 21.
And the rotational force is directly transmitted to the lance tube 3 by the belt 21.

The rotational force and the forward or backward movement operation can be applied simultaneously by mounting the belt 21 with the output pulley 20 inclined at the angle α with respect to the longitudinal direction of the lance tube 3. . Further, the inclination angle α is usually set to 20 to 60 degrees,
At the same time when the lance tube 3 rotates, forward or backward movement is efficiently performed.

When the inclination angle α is 0 degrees, the longitudinal direction of the lance tube 3 and the belt 21 are at right angles,
If only the rotation operation is performed and the inclination angle α is 90 degrees,
Since the longitudinal direction of the lance tube 3 and the belt 21 are parallel to each other, this is not suitable for operation.

In the present embodiment, as described above,
A belt 21 is stretched around the output pulley 20 and the lance tube 3 of the gear box 5 which is attached at an inclination, and the belt 21 is rotated, whereby the rotation and the forward (or backward) movement of the lance tube 3 can be simultaneously operated. Therefore, the structure is simple and the size can be reduced. Further, the gear box 5 and the motor 10 are connected to the casing 8
Since it is fixed to, there is no need for a free power system as in the past, wiring is simple, and there is an effect that it is lightweight and inexpensive to manufacture due to miniaturization.

[0028]

As described above in detail, according to the present invention, the lance tube having the nozzle is reciprocally moved in the axial direction while being rotated, is inserted into and removed from the heat exchanger, and is engaged with the inside of the lance tube. Is a slip-on type soot blowing device for injecting the injection medium supplied through the supply pipe into the heat exchanger from the nozzle, and is driven by a gear box disposed in the casing and a motor of the gear box. The present invention is characterized in that the output pulley and the belt that is slanted and stretched between the output pulley and the lance tube are provided. Therefore, the following effects are obtained.

(1) It is possible to provide a slip-on type soot-blowing device which has a simple structure and can be downsized, the number of parts is reduced, and which is lightweight and inexpensive.

(2) Since the motor is fixed and the cable is not pulled and moved as in the prior art, the wiring can be fixed, the casing structure can be simplified, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a slip-on type sootblower according to an embodiment of the present invention.

FIG. 2 is a view taken along the line XX in FIG.

FIG. 3 is an overall configuration diagram of a conventional slip-on type soot blowing device.

4A and 4B are explanatory views of a free power system of a conventional slip-on type soot blowing device. FIG. 4A is a left end position of the motor, FIG. 4B is a moving motor position, and FIG. 4C is a right end position of the motor. Each state is shown.

[Explanation of symbols]

 2 Supply pipe 3 Lance pipe 4 Nozzle 5 Gear box 7 Guide roller 8 Casing 10 Motor 12 Heat exchanger 13,14 Limit switch 15 Furnace wall 17 Support frame 20 Output pulley 21 Belt

Claims (1)

[Claims] 1. A lance tube, comprising: a casing having one end fixed to a furnace wall of a heat exchanger; and a lance pipe which is disposed in the casing and which penetrates a soot body supply pipe inside and has a nozzle at a tip. While rotating, reciprocate in the axial direction,
A differential soot blowing device that is inserted into and removed from the end of the casing into the heat exchanger, and an injection medium supplied through the supply pipe is injected from the nozzle into the heat exchanger, wherein the casing A gear box disposed in the gear box, an output pulley connected to a reduction gear driven by a motor provided in the gear box, the pulley inclining the axial direction of the output pulley and the longitudinal direction of the lance pipe. And a belt stretched between the lance tube and the lance tube, wherein the belt moves the lance tube in the axial direction at the same time while rotating the lance tube.