JP3585342B2 - Exhaust duct dust removal device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dust removing device for an exhaust duct such as a melting furnace for reducing or detoxifying waste or waste incineration ash, a high temperature coal gasification furnace (coal ash melting extraction furnace), and an electric furnace for steelmaking.
[0002]
[Prior 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.
[0003]
Therefore, conventionally, as shown in FIG. 4, a chain 51 is hung along an inner wall surface 50a of the exhaust duct 50, and the chain 51 is rotated by using a drive motor 52 to scrape off dust 53. There are devices to prevent blockage.
[0004]
[Problems to be solved by the invention]
However, when the exhaust duct 50 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, so that the flow rate balance in the melting furnace is reduced. Collapses.
[0005]
Therefore, an object of the present invention is to provide a dust removing device for an exhaust duct that can solve the above-mentioned problems.
[0006]
[Means for Solving the Problems]
Means for solving the problem in the present invention is to provide an annular removing body 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. Is provided with a plurality of winding bodies that are hung on the hanging rope at a plurality of locations where the outer peripheral portion thereof is separated by a predetermined interval, and a plurality of winding bodies that wind each of the hanging ropes are provided. In this case, the length of the hanging rope is set so that it is turned in the vertical direction by rotating it around the radial direction by a predetermined angle, and is turned in the opposite direction around the radial direction when ascending. A drive device for adjusting is provided, and a protrusion is formed on the outer peripheral portion of the removing body so as to slidably fit in a vertical groove formed on the inner peripheral surface of the exhaust duct, to detect the pressure in the exhaust duct. Pressure gauges are installed separately on the downstream and upstream sides of the exhaust duct, Control apparatus having a function of controlling the driving of the driving device in accordance with the difference of the pressure signal from the pressure gauge to control the drive of the drive unit to adjust the Decho is is provided.
[0007]
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 The driving of the driving device is controlled so as to adjust the length of the carrying cord, so that the winding body is rotated, and the removing body is turned by a predetermined angle around the radial direction to be vertically oriented, and the control is performed. The device slides down into the vertical groove formed on the inner peripheral surface of the exhaust duct while the removing body is output vertically to the drive device and outputs the drive signal to the driving device, and the removing body reaches the lower end of the vertical portion. Upon reaching, the control device controls the driving of the driving device so as to adjust the length of the hanging rope body, whereby the winding body rotates, and the removing body rotates around the radial direction in the opposite direction. Then, the control device outputs a drive signal to the drive device. Winder is removed body 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 by.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a dust removing device according to an embodiment of the present invention will be described with reference to the drawings.
[0009]
As shown in FIGS. 1 and 2, a dust removing device 1 according to an embodiment of the present invention is for removing dust 4 attached to an inner wall surface 3 of an exhaust duct 2 in a high-temperature melting furnace, for example.
[0010]
The exhaust duct 2 includes a vertical portion (annular cross section) 6 connected downstream of a temperature control tower (or an air heater) 5 for controlling the temperature of the dust 4 in the exhaust gas G, and the vertical portion 6. And a horizontal part 7 connected to the downstream side at the upper part of the upper part.
[0011]
An annular remover (formed of, for example, stainless steel) 8 having a diameter slightly smaller than the cross-sectional diameter of the vertical portion 6 and capable of moving up and down along the inner peripheral surface thereof is provided. A pair of hanging pieces 10 are attached at a plurality of locations whose outer peripheral portions are separated by a predetermined interval, that is, at 180 ° intervals, and formed on the outer peripheral portion of the removing body 8 so as to face the inner peripheral surface of the exhaust duct 2. A projection 12 is formed in the vertical groove 11 so as to be slidably fitted thereto. An end of a hanging rope 13 is detachably attached to the hanging piece 10, and is attached to a top wall 14 of the vertical part 6. An insertion hole 15 for the hanging rope 13 is formed, and two winding bodies 16 for winding each of the hanging rope 13 are provided, and one of the winding bodies 16 is connected to the other. It is arranged at a lower level compared to.
[0012]
Further, a drive motor 17 having an output shaft 17a connected to the rotation shaft of each winding body 16 is provided, and a pair of pressures for detecting the pressure in the exhaust duct 2 are provided on the vertical portion 6 and the horizontal portion 7 of the exhaust duct 2. The pressure gauges 18 are provided at a distance from each other, and these pressure gauges 18 are connected to a control device 30 described later via a differential pressure indicator 31, and a thermometer for detecting the temperature inside the exhaust duct 2 in the middle of the vertical section 6. 20 is provided so as to be freely inserted and withdrawn via a support device 21.
[0013]
As shown in FIG. 2, the support device 21 is attached to the vertical portion 6 and slidably supports the middle of the thermometer 20. The support box 22 supports the base of the thermometer 20 and an air cylinder device 23. And a moving body 24 attached to the rod 23a.
[0014]
In addition, 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 purge air 26 for blowing the accumulated dust 4 into the vertical portion 6 is attached.
[0015]
Further, a control device 30 for controlling the driving of each of the drive motors 17 and the air cylinder device 23 is provided. This control device 30 is provided in a predetermined diametric direction (both grooves) when the removing body 8 descends the exhaust duct 2. 11 is rotated in a vertical direction around a predetermined angle around a direction connecting the shortest distance 11 and a vertical direction A, and is rotated in the opposite direction around a predetermined diametrical direction when ascending to a horizontal state B. 17, a function of controlling the start / stop of the drive of the drive motor 17 according to the value of the pressure difference signal from the differential pressure indicator 31, and a function of supporting box 22 when driving the drive motor 17. Has a function of driving the air cylinder device 23 so as to retreat, and a function of driving the air cylinder device 23 so as to advance the support box 22 after the removal operation.
[0016]
Each pressure gauge 18 is connected to an input side of the 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.
[0017]
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 is discharged to a predetermined place. Is done.
[0018]
Incidentally, the dust 4 that has not been collected by the dust collector 5 gradually adheres to the inner wall surface 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 driving of the air cylinder device 23 and the driving motors 17 so as to perform the operation of removing the dust 4 from the vertical portion 6.
[0019]
Note that, when performing the operation of removing the dust 4, the removing body 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.
[0020]
First, the control device 30 outputs a drive signal to the air cylinder device 23. 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.
[0021]
Next, the control device 30 outputs a drive signal to each drive motor 17 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 maintains the vertical direction A, the protrusion 12 is slidably guided by the groove 11 and smoothly descends to the lower end of the vertical portion 6 by its own weight.
[0022]
The reason why the removing body 8 is lowered while maintaining the vertical direction A is that the removing body 8 is easily lowered by reducing the contact portion between the removing body 8 and the inner wall surface 3 of the vertical portion 6.
[0023]
Then, when detecting that the removing body 8 has been lowered to the lower end of the vertical portion 6 by a detector such as an encoder provided on the winding body 16, the control device 30 outputs a drive stop signal to both drive motors 17, Subsequently, 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 suspending rope 13, and as shown by the phantom line in FIG. 1, the remover 8 rotates around a predetermined diametric direction to be horizontal. State B is reached.
[0024]
Then, the control device 30 outputs a drive signal to both drive motors 17 so that the two winding bodies 16 wind the hanging rope 13 at the same speed. As a result, the protrusions 12 are slid and guided by the grooves 11 while the removing body 8 maintains the horizontal state B , and the ascent starts. At this time, since the removing body 8 is formed to have a diameter slightly smaller than the cross-sectional diameter of the vertical part 6 and follows the inner peripheral surface thereof, the dust 4 adhered to the inner wall surface 3 of the vertical part 6 by the outer peripheral surface of the removing body 8. Is removed by scraping.
[0025]
After that, the control device 30 outputs a drive signal to the air cylinder device 23 again. As a result, the moving body 24 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 rotates around a predetermined diametrical direction and becomes the vertical direction A.
[0026]
As described above, according to the embodiment of the present invention, the annular removing body 8 is provided so as to be able to move up and down along the inner wall surface 3 of the vertical section 6, and the inner wall surface of the vertical section 6 is moved up and down. Since the dust 4 attached to 3 is removed by scraping it off, the cross section of the vertical portion 6 is not reduced by a chain hanging down along the vertical portion 6 as in the prior art, and the exhaust gas G is reduced. Therefore, even if the vertical portion 6 has a relatively small diameter, it does not break the flow rate balance in the high-temperature melting furnace.
[0027]
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 on 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 as a pressure difference signal to a control device 30 via a differential pressure indicator 31, and both driving Since the driving of the motor 17 is controlled to automatically remove the dust 4, labor saving can be achieved.
[0028]
In the above-described 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, as shown in FIG. By forming it in a ring shape, dust 4 can be removed in the same manner as described above. Note that FIG. 3 is a diagram illustrating a state in which the removal body 8 is in the vertical direction A.
[0029]
Further, in the above-described embodiment, one of the two winding bodies 16 is disposed lower than the other, but the present invention is not limited to this, and the two winding bodies 16 may be the same. The removal operation can be performed by the same operation as described above by arranging at the height and adjusting the lead-out length of the hanging rope 13.
[0030]
Furthermore, in the above-described embodiment, when the removing body 8 is lowered along the vertical portion 6, the vertical direction is A. However, the present invention is not limited to this, and when the removing body 8 is lowered along the vertical portion 6. The dust 4 is removed by adjusting the lead-out length of the hanging rope 13 to bring the removing body 8 into the horizontal state B, and lowering the removing body 8 in the horizontal state B, thereby removing the dust 4 and keeping the horizontal state B. By raising the height, the dust 4 can be removed again by the removing body 8.
[0031]
As is clear from the above invention, the present invention provides an annular removing body that 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. When the outer peripheral portion is hung on the hanging rope at a plurality of locations separated by a predetermined interval, a plurality of winding bodies are provided for winding each of the hanging ropes, and the removed body is moved down the exhaust duct. Adjusting the length of the hanging rope in order to rotate it by a predetermined angle around the radial direction to make it vertical, and to rotate it around the radial direction in the opposite direction to make it horizontal A driving device is provided, and the driving device is driven to raise and lower the removing body to remove dust adhered 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. Flow through, and therefore, even in vertical sections of relatively small diameter, You can remove dust without a would break, also it is possible to remove the dust without stopping the operation of the equipment, operating rate is not lowered. Further, by lowering the removal body while maintaining the vertical orientation, the removal becomes easier.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an exhaust duct dust removing device 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 removed body according to another embodiment in a vertically oriented state.
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 Suspension piece 11 Groove 12 Projection 13 Suspension 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

Claims (4)

A dust removal device for removing dust adhering to the inner wall surface of an exhaust duct, which is formed in a diameter slightly smaller than a cross-sectional diameter of a vertical portion of the exhaust duct, and is capable of moving up and down along an 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 distance, and a plurality of winding bodies for winding each hanging rope are provided, In order to make the removal body turn by a predetermined angle around the radial direction when descending the exhaust duct and make it vertical, and when ascending, turn it around the radial direction in the opposite direction to make it horizontal, A dust removing device for an exhaust duct, further comprising a driving device for adjusting a lead-out length of the hanging rope. The dust removing device for an exhaust duct according to claim 1, wherein a projection is formed on an outer peripheral portion of the removing body so as to be slidably fitted in a vertical groove formed on an inner peripheral surface of the exhaust duct. The dust removing device for an exhaust duct according to claim 1 or 2, further comprising a control device for controlling the driving of the driving device so as to adjust the length of the hanging cord. 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 the control device controls the driving of the driving device according to the difference between the pressure signals from the pressure gauges. The dust removing device for an exhaust duct according to claim 3 , wherein the dust removing device has a function of performing the following.

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