JPH05322150A - Soot blower device for heat exchanger - Google Patents

Abstract

PURPOSE:To perform a sufficient soot removing operation against many heat exchangers arranged within a wide furnace by using an injection pipe having a nozzle showing a total cross sectional area restricted by the sectional area of a head valve. CONSTITUTION:Injection medium 9 is injected from a nozzle while an injection pipe 4 is being rotated through a motor 6 and gears 14 and 12, and then the injection pipe 4 is axially moved by a predetermined distance through a motor 35, a power transmitting mechanism 34, a screw rod 33, a boggie table 32, a hanger 39, a plurality of limit switches 38a to 38d and a supporting plate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soot blowing device used for removing soots adhering to the surfaces of a large number of heat exchange tubes contained in the body of a heat exchanger such as a boiler. Regarding

[0002]

2. Description of the Related Art Generally, a soot blowing device is inserted in the body of a heat exchanger such as a boiler, and it adheres to the surface of a large number of heat exchange tubes housed in the body of the heat exchanger, It is now used to remove accumulated soot. FIG. 6 schematically shows a conventional stationary rotary soot blowing device.

In FIG. 6, a large number of heat exchange tubes 2 are arranged in a furnace wall 1 of a boiler or the like which constitutes a heat exchanger. Then, between the heat exchange pipes 2, an injection pipe 4 supported by a large number of supports 3 at required points is inserted through the furnace wall 1. This injection pipe 4 is provided with an appropriate number of nozzles 5, and the injection pipe 4 is provided with a rotating mechanism 6 outside the furnace wall 1.
Is connected to the head valve 7 via. The ejection medium 9 is supplied to the head valve 7 via a flexible hose 8. Therefore, by ejecting the ejection medium 9 supplied from the head valve 7 from the nozzle 5 while rotating the ejection pipe 4 by the rotating mechanism 6, the soot that is attached to or deposited on the surface of the heat exchange pipe 2 Is to be removed.

[0004]

By the way, in such a conventional soot blower for a heat exchanger, the amount of the injection medium 9 supplied to the injection pipe 4 is determined by the injection medium of the valve seat portion of the head valve 7. It is determined by the passage cross-sectional area, and the total cross-sectional area of the nozzle 5 provided in the injection pipe 4 is regulated by the ejection medium passage cross-sectional area of the head valve 7. That is, since the number of nozzles 5 that can be installed is limited, there is a problem in that it is difficult to apply sufficient soot removal action to a large number of heat exchange tubes 2 arranged in a wide furnace. .. When the number of nozzles 5 is increased, the total cross-sectional area of the nozzles 5 inevitably becomes larger than the cross-sectional area of the head valve 7 through which the jet medium passes, and the jet medium 9 jetted from each nozzle 5 There was a problem that the soot removal efficiency was reduced due to the reduced injection flow velocity.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and uses an injection pipe having a nozzle having a total cross-sectional area regulated by the cross-sectional area of the head valve to provide a wide furnace. It is an object of the present invention to provide a soot blower device for a heat exchanger, which can sufficiently remove soot from a large number of arranged heat exchange tubes.

[0006]

In order to solve the above-mentioned problems, the present invention provides an injection pipe having a plurality of nozzles inserted into the body of a heat exchanger in which a large number of heat exchange pipes are housed. And a rotation drive device for rotating the injection pipe, wherein the injection medium is injected from the nozzle while rotating the injection pipe to remove soot and the like adhering to the surface of the heat exchange pipe. The soot-blowing device of the heat exchanger is provided with a moving means for moving the injection pipe in the axial direction by a predetermined distance, and a control means for controlling the moving operation by the moving means.

[0007]

[Operation] According to the above means, since the injection pipe of the soot blower can be moved in the axial direction, soots can be removed from a wide range of heat exchange pipes without increasing the number of injection nozzles. It can be removed. Further, a limited number of injection nozzles are formed in the injection pipe with high density, and the injection medium is applied to the surface of the heat exchange pipe by advancing or retreating the injection pipe, and soot is effectively removed. It is also possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIGS. In these figures, the same parts as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows an essential part of a soot blower for a heat exchanger according to an embodiment of the present invention, and FIG. 2 is inserted into a furnace wall of a boiler or the like which constitutes the heat exchanger. FIG. 7 is a view similar to FIG. 6 showing a state of an injection pipe. As shown in FIG. 2, in a furnace wall 1 in which a large number of heat exchange tubes 2 are arranged, an injection pipe 4 supported at a required position by a large number of supports 3 and having an appropriate number of nozzles 5 is formed. 1 is inserted through.

FIG. 3 shows an example of the nozzle 5 formed in the injection pipe 4. The supports 3 that support the injection pipes 4 are installed at appropriate intervals according to the width of the furnace wall 1 and the length of the injection pipes 4 to be inserted. For example, as shown in FIG. The support 3 is provided upright on the heat exchange tube 2 in the state, or as shown in FIG. 5 (the arrow view in the direction of the line AA in FIG. 2), between the adjacent heat exchange tubes 2 in the vertical state. The support 3 is welded and provided, and the injection pipe 4 is inserted into and supported by the circular opening 3 a of the support 3.

According to the present invention, the injection pipe 4 of the soot blowing device is supported by the support plate 11 outside the furnace wall 1 and the base portion is supported by the support plate 11 as shown in FIG. Is connected to the head valve 7. And the injection pipe 4
A rotation mechanism is connected to the. In this rotating mechanism, a gear 12 coaxially fitted to the injection pipe 4, a gear 14 having a shaft 13 meshing with the gear 12, and a shaft 13 are attached to the speed reducer 1.
And a motor 16 for rotating the injection pipe 4, and drives the injection pipe 4 to rotate.

Further, an engaging member 17 which rotates together with the ejecting pipe 4 is attached to the ejecting pipe 4, and the engaging member 17 comes into contact with and separates from a limit switch 18 attached to the supporting plate 11. With this, the rotation of the motor 16 is controlled.

Further, an opening / closing cam 19 is coaxially fitted to the injection pipe 4, and a cam follower 20 is in contact with the outer peripheral surface of the opening / closing cam 19. Then, in a certain rotation range of the opening / closing cam 19 that rotates together with the injection pipe 4, the cam follower 20 rotates about its fulcrum 21, and the hook 22 opens and closes the head valve 7 via the spring 23. Control is performed such that the ejection medium is supplied to the ejection pipe 4 or stopped.

On the other hand, outside the furnace wall 1, the beam 3 is horizontally provided.
1 is extended, and a moving table 32 is provided so that the beam 31 can be moved using the beam 31 as a guide. Then, the head valve 7 and the support plate 11 described above are attached to the moving table 32.
Is fixed. Further, a screw rod 33 is provided in parallel with the beam 31, and the screw rod 33 is screw-fitted to the moving base 32. A power transmission mechanism 34 including, for example, a chain or a ratchet wheel is connected to an end of the screw rod 33. Further, the beam 31 is provided with a motor 35 and a speed reducer 36 directly connected to the motor 35, and an output shaft 37 of the speed reducer 36 is connected to a power transmission mechanism 34.

Therefore, the screw rod 33 is rotated by the rotation of the motor 35, and the movable table 32 is moved by the rotation of the screw rod 33. Further, since the head valve 7 and the support plate 11 are fixed to the moving table 32, the injection pipe 4 moves in the axial direction together with these. That is, the moving table 32 can be moved forward or backward depending on the rotation direction of the screw rod 33, whereby the injection pipe 4
Can be moved forward and backward in the furnace wall 1.

A plurality of limit switches 38a, 38b, 38c, 38d are provided along the beam 31 at predetermined intervals a in order to control the forward / backward movement of the injection pipe 4 in the furnace wall 1. The movable table 32 is provided with a lock 39 that comes into contact with and separates from them.

Next, the operation of the soot-blowing device of the present invention thus constructed will be described. 1 and 2 show an initial state, in which the tip of the injection pipe 4 is placed slightly in front of the furnace wall 1 on the front side. In this state, first
When the motor 16 for rotating the injection pipe 4 is started,
The shaft 13 rotates via the speed reducer 15, and further the gear 14,
The injection pipe 4 rotates via 12. Opening and closing cam 19 at the same time
Also rotates, and the cam follower 20 only within the predetermined rotation angle range.
Since the head valve 7 is opened by the hook 22 of the nozzle 22, the jet medium 9 is supplied to the jet pipe 4 and the jet medium 9 is discharged from the nozzle 5.
Is sprayed on the surface of the heat exchange tube 2 to remove soot.

When the injection pipe 4 makes one revolution, the armature 17 provided on the injection pipe 4 comes into contact with the limit switch 18 to operate it. Therefore, by this signal, the motor 16 is stopped, the rotation of the injection pipe 4 is stopped, and the head valve 7 is closed, so that the supply of the injection medium 9 is also stopped. At the same time, the motor 35 for moving the support 32 is operated by the operation signal of the limit switch 18. That is, when the motor 35 operates, the screw rod 33 rotates via the speed reducer 36 and the power transmission mechanism 34, and moves the support base 32 along the beam 31 to the right side in FIG. 1. Therefore, the injection pipe 4 advances to the inner side of the furnace wall 1 together with the head valve 7 and the support plate 11.

When the injection pipe 4, that is, the support base 32 advances by the distance a, the armature 39 provided on the support base 32 comes into contact with the limit switch 38b and operates it to stop the motor 35 by the signal. At the same time, the motor 16 for rotating the injection pipe 4 is started by this signal,
The jet medium 9 is jetted from the nozzle 5 while rotating the jet pipe 4. As a result, the jet medium 9 is jetted onto the surface of the heat exchange tube 2 at a position different from the previous one, and soot is removed.

The soot removal work is carried out by repeating the same operation, but when the soot removal work is completed in the entire furnace at the position of the limit switch 38d and the limit switch 18 is operated, the motor 35 is activated by the signal. It is driven in reverse rotation.
Therefore, when the movable table 32 moves backward and the lock 39 contacts the limit switch 38a, the motor 35 is stopped by the signal. As a result, the injection pipe 4 is returned to the original position, and one reciprocating operation is completed.

Even when the moving table 32 and the injection pipe 4 are retracted, the injection pipe 4 is stopped at the positions of the limit switches 38c and 38b, and the ejection medium 9 is ejected as in the forward movement to remove it. You may make it perform a soot operation. Moreover, you may make it retreat to the original position of the injection pipe 4 at once while ejecting the injection medium 9.

[0022]

As described in detail above, according to the present invention,
In a furnace such as a boiler constituting a heat exchanger, the injection pipe of the soot blower is moved in the axial direction to inject the injection medium, so that a heat exchanger having a large number of heat exchange pipes is used. Also, the soot of a very useful heat exchanger, which can effectively remove soot over a wide range without increasing the supply amount of the injection medium supplied to the injection pipe or increasing the number of nozzles. A blowing device is provided.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of a soot blower for a heat exchanger according to the present invention.

FIG. 2 is a diagram showing an installation state of an injection pipe used in the soot blowing device of the present invention in a furnace such as a boiler.

FIG. 3 is a cross-sectional view showing an example of a nozzle provided in an injection pipe.

FIG. 4 is a diagram showing an example of a support for supporting an injection pipe.

FIG. 5 is a view for explaining a support for supporting the injection pipe,
FIG. 3 is a view taken along line AA of FIG.

FIG. 6 is a view for explaining a soot blowing device of a conventional heat exchanger,
It is a figure which shows the installation state in the furnace of a boiler etc. of an injection pipe.

[Explanation of symbols]

 1 Furnace wall 2 Heat exchange pipe 4 Injection pipe 5 Nozzle 9 Injection medium 11 Support plate 12, 14 Gear 16 Motor 32 Moving stand 33 Screw rod 34 Power transmission mechanism 35 Motor 38a-38d Limit switch 39 Sliding wire

Claims (1)

[Claims] 1. An injection pipe having a plurality of nozzles inserted into a main body of a heat exchanger containing a large number of heat exchange pipes,
A rotation drive device for rotating the injection pipe is provided, and the injection medium is injected from the nozzle while rotating the injection pipe to remove the soot and the like adhering to the surface of the heat exchange pipe. A soot-blowing device for a heat exchanger, comprising: a moving means for moving the injection pipe in a predetermined distance in an axial direction thereof; and a control means for controlling a moving operation by the moving means. apparatus.