JPH0729387Y2 - Soot blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a slip-on type soot having a supply pipe that penetrates a gear box for driving a lance pipe and supplies a high-temperature and high-pressure injection medium to the lance pipe. Blowing equipment.

[Conventional technology]

 A conventional slip-on type sootblower will be described with reference to FIG.

The soot blower operates the valve opening / closing device by moving the gear box 5 to open / close the valve 1 attached to the rear end of the casing 8 to supply / shut off high-temperature / high-pressure injection medium such as steam. The injection medium passes through a feed pipe 2 connected to the valve 1 and penetrating the gear box 5 and a lance pipe 3 connected to the feed pipe 2 from a nozzle 4 provided at the tip of the lance pipe 3 to a boiler and other components. The injection medium is ejected toward the heat exchanger 12.

The gear box 5 and the lance pipe 3 are integrally connected at the rear end on the opposite side to the heat exchanger 12, and the casing 8 is supported by the support roller 6 at the front end of the device on the heat exchanger 12 side and the guide roller 7 provided in the gear box 5. Supported by. The gear box 5 has an electric motor 9
The rotation of the electric motor 9 is decelerated by the gear box 5 and the lance tube 3 is rotated about its axis.

On the other hand, a pinion gear 10 driven by the electric motor 9 via the gear box 5 is provided above the gear box 5, and the pinion gear 10 meshes with a rack 11 mounted on the upper part of the casing 8 The rotation of 9 rotates the upper pinion gear 10 which is decelerated by the gear box 5, and the pinion gear 10
The gear box 5 moves forward and backward in the axial direction together with the lance tube 3 due to the engagement between the gear box 5 and the rack 11. At this time, the gear box 5
It reciprocates between points D and E, and accordingly, the nozzle 4 at the tip of the lance tube 3 reciprocates between point A outside the heat exchanger 12 and point C inside the heat exchanger 12. As described above, the lance tube 3
Since the motor is rotated about its axis by the electric motor 9, the motor rotates between the points A and C and reciprocates (advance and retract) in the axial direction.

The soot blowing device receives a start signal from the remote side or the machine side and starts the start. The nozzle 4 of the lance pipe 3 advances toward the heat exchanger 12 and reaches the position B from the point A at the gear box 5
Operates the valve opening / closing device 17 provided in the casing 8, whereby the valve 1 is opened, the injection medium is guided to the lance pipe 3 via the supply pipe 2, and the injection from the nozzle 4 is started. Furthermore, the lance tube 3 rotates and advances in the axial direction (forward).
When the operation is continued and the point C in the heat exchanger 12 is reached, the reverse limit switch 13 provided on the front side (heat exchanger side) of the casing 8 disengages the guide roller 7 provided on the gear box 5, and the electric motor 9 is turned on. Reverse rotation. As a result, the rotation and axial operation of the lance tube 3 are reversed, and the lance tube 3 continues to rotate and retract (return), and when the nozzle 4 of the lance tube 3 reaches point B, it is directly connected to the lance tube 3. Gear box 5 is a valve opening / closing device
The valve 1 is fully closed by operating 17 in the opposite direction. Further, the lance tube 3 continues to rotate and retreat, and reaches the stop position A point, that is, the gear box 5 reaches the D point, and the guide roller 7 provided in the gear box 5 disengages the stop limit switch 14 provided in the casing 8. , Complete all operations.

As described above, the high-temperature and high-pressure jet medium is jetted from the nozzle 4 of the lance tube 3 between the points B and C, and the lance tube 3 rotates and reciprocates in the axial direction during this period. A wide range of soot-blowing of the heat exchanger 12 is performed.

The casing 8 of the soot blower is fixed to a wall box 16 which is fixed to the outer wall 15 of the heat exchanger 12 and through which the lance pipe 3 passes, and the rearward portion of the casing 8 is suspended by a support frame 20.

Therefore, the lance pipe 3 and the supply pipe 2 of the soot blowing device are located outside the heat exchanger 12 while the soot blowing device is at rest, are cooled by the outside air, and are at room temperature (room temperature).

[Problems to be solved by the device]

As described in the above-mentioned section of the prior art, in the conventional soot blowing device, the lance pipe and the supply pipe are at a normal temperature outside the heat exchanger at the time of the rest, and immediately after the injection medium is supplied at the initial stage of the operation. During the time it takes for the lance pipe and the supply pipe to heat up, a large amount of condensed drainage is generated, and spraying it onto the heat exchanger may cause fatal damage to the heat exchanger such as corrosion and wear. there were.

The present invention is intended to provide a soot blowing device capable of solving this problem.

[Means for Solving the Problems]

The present invention provides a gear box that rotates a lance tube having a nozzle around its axis and advances and retreats in the axial direction to insert and remove, and a supply medium that penetrates the gear box and supplies a high temperature and high pressure injection medium to the lance tube. In a soot blowing device including a pipe and a limit switch provided in accordance with a limit position for advancing / retracting the lance pipe, an intermediate portion between a nozzle of the lance pipe and an outer wall of the heat exchanger outside the cleaning position. The casing is provided with an intermediate limit switch that temporarily stops the rotation and axial movement of the lance tube when advanced to the position.

[Action]

In a soot blowing device in which the nozzle of the lance tube is in the retracted position outside the heat exchanger when the lance tube is at rest, the lance tube and the supply pipe are at room temperature outside the heat exchanger when at rest. At the beginning of the operation of the soot blowing device, immediately before the high temperature and high pressure injection medium is supplied, until the temperature of the lance pipe and the supply pipe rise
A large amount of drain is generated in the supply pipe and lance pipe.

In the present invention, in the initial stage of operation of the soot blowing device, at the position where the nozzle of the lance pipe does not blow the medium to the heat exchanger when the lance pipe advances axially toward the heat exchanger while rotating. The intermediate switch temporarily stops the rotation and axial movement of the lance tube. As a result, the generated drainage is discharged from the nozzle of the lance pipe without being sprayed to the heat exchanger, and the high temperature
The temperature of the supply pipe and the lance pipe rises due to the high-pressure jet medium. After the drain is discharged, the lance tube restarts the rotation and the axial operation, and the high-temperature and high-pressure injection medium is blown from the nozzle of the lance tube to the heat exchanger to perform soot blowing. In this way, harmful drains are prevented from spraying the heat exchanger.

〔Example〕

 An embodiment of the present invention will be described with reference to FIG.

This embodiment is an improvement of the conventional soot-blowing apparatus shown in FIG. 2 as described below, and the same parts in FIG. 1 are designated by the same reference numerals as those in FIG. The description is omitted.

In this embodiment, the limit switch for stopping the casing 8 is used.
An intermediate limit switch operated by the guide roller 7 of the gear box 5 at an intermediate position between the reverse limit switch 14 and the reverse limit switch 13.
18 are provided. The intermediate limit switch 18 advances toward the inside of the heat exchanger 12 while the lance pipe 3 rotates, and the nozzle 4 at the tip of the lance pipe 3 is a space between the outer wall 15 of the heat exchanger and the heat exchanger 12. The guide roller 7 of the gear box 8 is set to a position where it is actuated by the intermediate limit switch 18 when the fluid ejected from the nozzle 4 is not sprayed to the heat exchanger 12 at the point B in 19 . Further, the intermediate limit switch 18 is connected to the electric motor 9 so that when the guide roller 7 of the gear box 5 is operated, the operation of the electric motor 9 is temporarily stopped.

In the present embodiment, the rotation of the electric motor 9 is decelerated by the gear box 5 to give rotation to the lance tube 3 and rotate the pinion gear 10 of the gear box 5 so that the gear 10 meshes with the rack 11 of the casing 8. The lance tube 3 moves in the axial direction depending on the position, and the nozzle of the lance tube 3 rotates between the point A outside the heat exchanger 12 and the point C inside the heat exchanger 12 by the stop switch 14 and the retract limit switch. While reciprocating, the high-temperature and high-pressure jet medium supplied through the supply pipe 2 and the lance pipe 3 is jetted from the nozzle 4 to soot the heat exchanger 12.

As described above, when the soot blowing device is at rest, the lance pipe 3 and the supply pipe 2 are outside the heat exchanger 12, so that the temperature thereof is lowered. In the early stage of operation of the soot blowing device, therefore, the supplied high-temperature and high-pressure injection medium becomes drain inside the supply pipe 2 and the lance pipe 3.

In the present embodiment, in the initial stage of operation of the soot blowing device, the nozzle 4 at the tip of the lance pipe 3 has a space between the heat exchanger 12 and its outer wall 15 from the retracted position A outside the heat exchanger 12 at rest.
When the position B in 19 (the above-mentioned high temperature / high pressure injection start position) is reached, the guide roller 7 of the gear box 5 operates the intermediate limit switch to operate, whereby the electric motor 9 is temporarily stopped and the lance The rotation and the axial movement of the tube 3 are temporarily stopped. During this stop, the supply pipe 2 and the lance pipe 3
A high-temperature and high-pressure jet medium is supplied to the nozzle to generate drainage, which is jetted from the nozzle 4 and discharged. Since the nozzle 4 of the lance pipe 3 is in the space between the heat exchanger 12 and the outer wall 15 thereof as described above, the drain injected from the nozzle 4 is not blown to the heat exchanger 12. As a result, harmful drainage that causes corrosion and wear to the heat exchanger 12 is prevented from being blown to the heat exchanger 12.

During the temporary stoppage time, the drain is the supply pipe 2 and the lance pipe 3
The temperature of the supply pipe 2 and the lance pipe rises due to the high-temperature and high-pressure injection medium discharged from the chamber and supplied at the same time. After that, the operation of the electric motor 9 is restarted, whereby the rotation and the axial operation of the lance tube 3 are restarted, and the high temperature and high pressure injection medium is blown to the heat exchanger 12.

As described above, in the present embodiment, it is possible to prevent the harmful drain generated in the supply pipe 2 and the lance pipe 3 from being blown to the heat exchanger in the initial operation of the soot blowing device.

[Effect of device]

As described in detail above, the present invention temporarily suspends the rotation and axial operation of the lance pipe by the intermediate limit switch before sooting a wide range of heat exchangers, during which the condensation occurs in the supply pipe and the lance pipe. The generated drainage is ejected by ejecting it to a place that does not affect the heat exchanger.
The temperature of the supply pipe and the lance pipe at room temperature (room temperature) is raised, and the soot is blown from the heat exchanger by the high-temperature and high-pressure injection medium to prevent spraying of drain to the heat exchanger. Can damage the heat exchanger (corrosion, wear, etc.)
Can be prevented.

[Brief description of drawings]

FIG. 1 is an illustration of an embodiment of the present invention, and FIG. 2 is an illustration of a conventional soot blowing device. 1 …… Valve, 2 …… Supply pipe, 3 …… Lance pipe, 4 …… Nozzle, 5 …… Gearbox, 7 …… Guide roller, 8 …… Casing, 9
...... Motor, 12 ...... Heat exchanger, 13 ...... Reverse limit switch, 14 …… Stop limit switch, 15 …… Heat exchanger outer wall, 16 …… Wall box, 17 …… Valve opening and closing device, 1
8 …… Intermediate limit switch, 19 …… Space section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazunami Shionaka 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Plant (72) Akira Murai Kannon Shin-cho, Nishi City, Hiroshima Prefecture 4-62-22 Mitsubishi Heavy Industries, Ltd. Hiroshima Works (56) References: 62-63537 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A gear box for rotating a lance tube having a nozzle around its axis and advancing and retreating in the axial direction, and a supply for supplying a high temperature and high pressure injection medium to the lance tube through the gear box. In a soot blowing device including a pipe and a limit switch provided in accordance with a limit position for advancing / retracting the lance pipe, an intermediate portion between a nozzle of the lance pipe and an outer wall of the heat exchanger outside the cleaning position. A soot blowing device, characterized in that an intermediate limit switch for temporarily stopping the rotation and axial movement of the lance pipe when advanced to the position is provided in the casing.