JPH10267252A - Dust remover for exhaust duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable removal of dust without breaking balance in flow rate even when a vertical part used is relatively small in diameter and without stopping the operation of equipment. SOLUTION: A circular removing body 8 is made free to move vertically along an internal wall surface 3 of a vertical part 6 of an exhaust dust 2 and is moved vertically to remove dust 4 adhering to the internal wall surface 3 of the vertical part 6 by being raked thereoff. An exhaust gas G passes smoothly through the center of the removing body 8 to eliminate loss of balance of the flow rate even when the vertical part 6 is relatively limited in diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to exhaust gas from, for example, a melting furnace for reducing the volume or detoxification of waste and incinerated ash, a high temperature coal gasification furnace (coal ash melting and extracting furnace), and an electric furnace for steelmaking. The present invention relates to a dust removing device for a duct.

[0002]

2. Description of the Related Art For example, when solid matter such as waste incineration ash is melted at a high temperature, a large amount of oxidizing gas and decomposition gas are generated, and fine particles are generated with the generation of these exhaust gases. The exhaust gas captures and exhausts the dust by passing through the dust collector, but the dust that cannot be captured is deposited on the inner wall surface of the exhaust duct.
If this state is left as it is, the exhaust duct will be blocked, and it will be necessary to remove it.

Conventionally, as shown in FIG. 4, a chain 51 is hung along an inner wall surface 50a of an exhaust duct 50, and the chain 51 is rotated by using a drive motor 52 to scrape dust 53 off. There is a device for preventing the duct 50 from being blocked.

[0004]

However, the exhaust duct 5
When 0 is elongated, the length of the chain 51 is limited, and the cross section of the exhaust duct 50 is reduced due to the chain 51 entering the inside of the exhaust duct 50, and the flow rate balance in the melting furnace is lost. .

Accordingly, an object of the present invention is to provide a dust removing device for an exhaust duct which can solve the above-mentioned problems.

[0006]

Means for solving the problem of the present invention is to provide an annular duct which is formed to have a diameter slightly smaller than the cross-sectional diameter of the vertical portion of the exhaust duct and is capable of moving up and down along the inner peripheral surface thereof. A removing body is provided, and the removing body is hung on the hanging rope at a plurality of locations where the outer peripheral portion is separated by a predetermined interval, and a plurality of winding bodies for winding each hanging rope are provided,
In order to turn the removal body vertically by rotating a predetermined angle around the radial direction when descending the exhaust duct, and to rotate it in the opposite direction around the radial direction when ascending, the removal body is suspended. A drive device for adjusting the lead-out length of the holding cord is provided, and a protrusion is formed on an outer peripheral portion of the remover so as to slidably fit in a vertical groove formed on an inner peripheral surface of the exhaust duct, Pressure gauges for detecting the pressure in the exhaust duct are provided separately on the downstream side and the upstream side of the exhaust duct, and control the driving of the driving device so as to adjust the length of the hanging rope and adjust the pressure. A control device having a function of controlling the driving of the driving device according to the difference between the pressure signals from the gauge is provided.

In the above configuration, a pressure gauge provided separately on the downstream side and the upstream side of the exhaust duct detects the pressure in the exhaust duct, and when a difference between pressure signals from the pressure gauge exceeds a predetermined value, the control device Controls the drive of the driving device to adjust the length of the hanging rope, so that the winding body rotates, and the removing body rotates by a predetermined angle around the radial direction and becomes vertical. In addition, the control device outputs a drive signal to the drive device, so that the removing body slides down in the vertical groove formed on the inner peripheral surface of the exhaust duct while the removing body remains in the vertical orientation, and the removing body moves in the vertical portion. When reaching the lower end, the control device controls the drive of the driving device so as to adjust the length of the hanging rope, whereby the winding body rotates and the removing body rotates in the opposite direction around the radial direction. It moves to a horizontal state, and then the control unit sends a drive signal to the drive unit. Output, thereby removing body winder rotates in the opposite direction is increased along a vertical portion of the exhaust duct, to remove the dust adhered to the inner wall surface of the exhaust duct.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dust removing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a dust removing apparatus 1 according to an embodiment of the present invention removes dust 4 attached to an inner wall 3 of an exhaust duct 2 in a high-temperature melting furnace, for example. It is.

The exhaust duct 2 is provided with dust 4 in the exhaust gas G.
(Annular section) 6 connected to the downstream side of a temperature control tower (or air heater) 5 for controlling the temperature, and a horizontal part 7 connected to the upper part of the vertical part 6 and downstream. It is composed of

An annular remover (made of, for example, stainless steel) 8 which is formed to have a diameter slightly smaller than the cross-sectional diameter of the vertical portion 6 and is movable up and down along the inner peripheral surface thereof is provided. The body 8 is provided at a plurality of locations where its outer peripheral portion is separated by a predetermined interval, that is, at every 180 °
A projection 12 is formed on the outer peripheral portion of the removing body 8 so as to slidably fit in a pair of vertical grooves 11 formed facing the inner peripheral surface of the exhaust duct 2. Piece 10
An end portion of the hanging rope 13 is detachably attached to the ceiling portion, an insertion hole 15 for the hanging rope 13 is formed in the top wall 14 of the vertical portion 6, and each of the hanging ropes 13 is wound up. For this purpose, two winding bodies 16 are provided, and one of these winding bodies 16 is disposed lower than the other.

The output shaft 1 is connected to the rotating shaft of each winding body 16.
7a is provided, and a pair of pressure gauges 18 for detecting the pressure in the exhaust duct 2 are separately provided in the vertical section 6 and the horizontal section 7 of the exhaust duct 2. Reference numeral 18 is connected to a control device 30 described later via a differential pressure indicator 31, and a thermometer 20 for detecting the temperature in the exhaust duct 2 is provided in the middle of the vertical portion 6.
Are provided so as to be freely inserted and withdrawn through.

As shown in FIG. 2, this support device 21
It comprises a support box 22 attached to the vertical portion 6 and slidably supporting the middle of the thermometer 20, and a moving body 24 supporting the base of the thermometer 20 and attached to the rod 23 a of the air cylinder device 23. Have been.

A seal 25 which is also used as a peeling member for peeling off the dust 4 adhered to the thermometer 20 is attached to a sliding portion between the support box 22 and the thermometer 20. A discharge pipe 27 for discharging a purge air 26 for blowing dust 4 accumulated in the inside 22 into the vertical portion 6 is attached.

A control device 30 for controlling the driving of each of the drive motors 17 and the air cylinder device 23 is provided.
When the removing unit 8 descends the exhaust duct 2, the control unit 30 rotates a predetermined angle around a predetermined diameter direction (a direction connecting the two grooves 11 at the shortest distance) to a vertical direction A,
The function of controlling the drive of the drive motor 17 and the function of controlling the drive of the drive motor 17 in accordance with the value of the pressure difference signal from the differential pressure indicator 31 in order to rotate in the opposite direction around a predetermined diametric direction when ascending to the horizontal state B A function of controlling the start / stop of driving of the drive motor 17, a function of driving the air cylinder device 23 so as to retract the support box 22 when driving the drive motor 17,
It has a function of driving the air cylinder device 23 so as to advance the support box 22 after the removal operation is completed.

Each of the pressure gauges 18 is connected to an input side of a control device 30 via a differential pressure indicator 31, and each drive motor 17 and the air cylinder device 23 are connected to an output side of the control device 30. .

In the above configuration, the exhaust gas G generated in the high-temperature melting furnace passes through the dust collector 5, where the dust 4 is collected, passes through the vertical portion 6 of the exhaust duct 2, passes through the horizontal portion 7, and has a predetermined shape. Discharged to the place.

The dust 4 that has not been collected by the dust collector 5 gradually adheres to the inner wall 3 of the exhaust duct 2.
On the other hand, the pressure in the vertical portion 6 and the horizontal portion 7 is detected by each pressure gauge 18, and when the dust 4 gradually adheres to the inner wall surface 3 of the exhaust duct 2, the pressure in the vertical portion 6 and the horizontal There is a difference in the pressure in the part 7. This pressure difference is output to the control device 30 as a pressure difference signal by the differential pressure indicator 31. When the pressure difference signal reaches a predetermined value, it is determined that the dust 4 has adhered to the inner wall surface 3 of the vertical portion 6. Then, the control device 30 controls the air cylinder device 23 and the respective drive motors 1 to remove the dust 4 from the vertical portion 6.
7 is controlled.

When the operation of removing the dust 4 is performed, the remover 8 is in the vertical direction A rotated by a predetermined angle around a predetermined diametric direction as shown by a solid line in FIG.

First, the control device 30 controls the air cylinder device 2
The drive signal is output to the control signal 3. As a result, the moving body 24 retreats, and the thermometer 20 retreats from the inner wall surface 3 of the vertical portion 6.
At this time, the dust 4 previously accumulated in the support box 22 is blown into the vertical portion 6 by discharging the purge air 26 from the discharge pipe 27. The dust 4 attached to the periphery of the thermometer 20 is scraped off by the seal 25.

Next, the control device 30 controls each drive motor 17
Then, a drive signal is output so that each winding body 16 is led out of the hanging rope 13 at the same speed. As a result, while the removal body 8 is maintained in the vertical direction A, the protrusion 12 is slidably guided in the groove 11 and smoothly descends to the lower end of the vertical portion 6 by its own weight.

The reason why the removing body 8 is lowered while maintaining the vertical direction A is to make the removing body 8 easy to descend by reducing the contact portion between the removing body 8 and the inner wall surface 3 of the vertical portion 6. is there.

When the control unit 30 detects that the removing unit 8 has been lowered to the lower end of the vertical portion 6 by a detector such as an encoder provided on the winding unit 16, the control unit 30 sends a drive stop signal to both drive motors 17. Then, the control device 30 outputs a drive signal to only one drive motor 17. As a result, only one take-up body 16 rotates to pull out one suspension rope 13, and as shown by the phantom line in FIG. 1, the remover 8 rotates around a predetermined diametrical direction and moves horizontally. The state becomes B.

Then, the control device 30 controls the drive motors 17 so that the two winding bodies 16 are at the same speed and the hanging rope 1
Then, a drive signal is output so as to wind up No. 3. As a result, while the removing body 8 maintains the vertical direction A, the protrusion 12 is slidably guided by the groove 11 and starts to ascend. At this time, remover 8
Is formed so as to have a diameter slightly smaller than the cross-sectional diameter of the vertical portion 6 and along the inner peripheral surface, so that the outer peripheral surface of the removing body 8 scrapes off the dust 4 attached to the inner wall surface 3 of the vertical portion 6. To remove.

After that, the control device 30 outputs a drive signal to the air cylinder device 23 again. With this, moving body 2
4 advances, and the thermometer 20 projects from the inner wall surface 3 of the vertical portion 6. Control device 30 outputs a drive signal to one drive motor 17 so that only one winding body 16 rotates. As a result, as shown by the solid line in FIG. 1, the removing body 8 is rotated around a predetermined diametrical direction to be in the vertical direction A.

As described above, according to the embodiment of the present invention,
An annular remover 8 is provided so as to be able to move up and down along the inner wall surface 3 of the vertical portion 6, and the dust 4 attached to the inner wall surface 3 of the vertical portion 6 is removed by lifting and lowering the remover 8. As a result, the cross section of the vertical portion 6 is not reduced by the chain hanging down along the vertical portion 6 as in the related art, and the exhaust gas G smoothly passes through the center of the removing body 8. Even with the vertical portion 6 having a relatively small diameter, the flow rate balance in the high-temperature melting furnace is not broken.

Further, since the dust 4 can be removed without stopping the operation of the high-temperature melting furnace, the operation rate does not decrease. Further, pressure gauges 18 are provided in the vertical section 6 and the horizontal section 7 of the exhaust duct 2, and a pressure difference from these pressure gauges 18 is output to the control device 30 as a pressure difference signal via a differential pressure indicator 31, and both driving Since the drive of the motor 17 is controlled to automatically remove the dust 4, labor saving can be achieved.

In the above embodiment, the vertical portion 6 has an example of a circular cross section. However, for example, when the vertical portion 6 has a rectangular cross section, the removed body is formed as shown in FIG. The dust 4 can be removed in the same manner as described above by forming the rectangular shape 8. Note that FIG. 3 is a diagram illustrating a state where the removing body 8 is in the vertical direction A.

Further, in the above-described embodiment, one of the two winding bodies 16 is arranged lower than the other. However, the present invention is not limited to this.
The removal operation can be performed by the same operation as described above by arranging the 6 at the same height and adjusting the lead-out length of the hanging rope 13.

Further, in the above-described embodiment, when the removing member 8 is lowered along the vertical portion 6, the vertical direction A is used. However, the present invention is not limited to this, and the removing member 8 is moved along the vertical portion 6. At the time of lowering, the removal length of the hanging rope 13 is adjusted to bring the removal body 8 into the horizontal state B, and the removal body 8 is brought into the horizontal state B.
The dust 4 is removed by lowering it as it is.
The dust 4 can be removed again by the removing body 8 by raising the horizontal state B.

[0031]

As is apparent from the above invention, the present invention provides an annular duct which is formed to have a diameter slightly smaller than the cross-sectional diameter of the vertical portion of the exhaust duct and which can be moved up and down along the inner peripheral surface. The removed body is hung on the hanging rope at a plurality of locations where the outer peripheral portion is separated by a predetermined distance, and a plurality of winding bodies for winding each of the hanging ropes are provided, and the winding bodies are rotated. A drive device for driving is provided, and the drive device is driven to move up and down the removing body to remove dust adhering to the inner peripheral surface of the vertical portion of the exhaust duct, so that the exhaust gas smoothly flows through the center of the removing body. Therefore, even in a vertical portion having a relatively small diameter, dust can be removed without breaking the flow rate balance, and dust can be removed without stopping operation of the equipment. The operating rate does not decrease.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a dust removing device for an exhaust duct in a high-temperature melting furnace showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the entire configuration of a thermometer supporting device.

FIG. 3 is a side view of a vertically removed state of a removed body according to another embodiment.

FIG. 4 is an overall configuration diagram of a conventional dust removing device for an exhaust duct in a high-temperature melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust removing device 2 Exhaust duct 3 Inner wall surface of exhaust duct 4 Dust 5 Dust collector 6 Vertical part 7 Horizontal part 8 Remover 10 Hanging piece 11 Groove 12 Projection 13 Hanging rope 16 Winding body 17 Drive motor 18 Pressure gauge 20 Thermometer 21 Support device 22 Support box 23 Air cylinder device 24 Moving body 30 Control device 31 Differential pressure indicator G Exhaust gas

Continuation of the front page (72) Inventor Toshiro Sakata 5-3-28 Nishikujo, Konohana-ku, Osaka-shi Inside Hitachi Zosen Corporation (72) Inventor Tsuneharu Sakakibara 5-3-1 Nishikujo, Konohana-ku, Osaka-shi, Osaka 28 Hitachi Zosen Corporation (72) Katsuya Noritomi 5-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka

Claims (5)

[Claims] 1. A dust removing device for removing dust attached to an inner wall surface of an exhaust duct, wherein the dust removing device is formed to have a diameter slightly smaller than a cross-sectional diameter of a vertical portion of the exhaust duct and extends along an inner peripheral surface thereof. A ring-shaped remover that can be raised and lowered is provided, and the remover is hung on a suspending rope at a plurality of locations where the outer peripheral portion is separated by a predetermined distance, and a plurality of windings are wound around each suspending rope. A dust removing device for an exhaust duct, comprising: a body; and a driving device for rotating the winding body. 2. A dust removing device for removing dust adhering to an inner wall surface of an exhaust duct, wherein the dust removing device is formed to have a diameter slightly smaller than a cross-sectional diameter of a vertical portion of the exhaust duct and extends along an inner peripheral surface thereof. A ring-shaped remover that can be raised and lowered is provided, and the remover is hung on a suspending rope at a plurality of locations where the outer peripheral portion is separated by a predetermined distance, and a plurality of windings are wound around each suspending rope. A body is provided, and the removing body is turned vertically by rotating a predetermined angle around the radial direction when descending the exhaust duct, and is rotated in the opposite direction around the radial direction when ascending, and is horizontal. A dust removing device for an exhaust duct, wherein a driving device for adjusting a lead-out length of the hanging rope is provided. 3. The exhaust duct according to claim 2, wherein a projection is formed on an outer peripheral portion of the removing body so as to slidably fit in a vertical groove formed on an inner peripheral surface of the exhaust duct. Dust removal equipment. 4. A dust removing device for an exhaust duct according to claim 2, further comprising a control device for controlling the driving of the driving device so as to adjust the lead-out length of the hanging rope. apparatus. 5. A pressure gauge for detecting a pressure in an exhaust duct is provided at a distance downstream and upstream of the exhaust duct, and a control device is driven in accordance with a difference between pressure signals from the pressure gauges. The dust removing device for an exhaust duct according to claim 4, further comprising a function of controlling driving of the device.