JP3947893B2 - Cleaning device for dry type electric dust collector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning apparatus of a dry electrostatic precipitator, it relates to a cleaning apparatus which forms a removal of dust adhered to the collected dust collecting electrode, in particular by dry electrostatic precipitator.
[0002]
[Prior art]
A dry electrostatic precipitator has a plurality of dust collecting electrode units in which a net-like discharge electrode and a flat dust collecting electrode are alternately arranged in parallel inside a casing forming a gas flow path, and gas is collected in the dust collecting electrode. Dust is collected at the collecting electrode when circulating between them. In such a dry electrostatic precipitator, it is necessary to clean the inside of the precipitator regularly (usually about once or twice a year) in order to perform inspection work and repair work.
[0003]
Conventionally, the dust collecting electrode unit described above has been cleaned using the following method.
That is, the conventional cleaning method arrange | positions a vertical water pipe | tube along the side edge part of the dust collection electrode unit arranged in parallel, and sprays water from the several injection nozzle provided in the middle of this vertical water pipe | tube. Then, the surface of the dust collecting electrode unit is washed away by this water spray, and the dust collecting electrode unit is washed.
The dust washed away with water is separated from the water and collected by the subsequent water treatment.
[0004]
[Problems to be solved by the invention]
However, the above-described cleaning method has the following problems.
That is, in the dry electrostatic precipitator, the above-described cleaning operation is about once or twice a year. For this reason, using a large-scale device that attaches a plurality of injection nozzles to the vertical water pipe only for the above-described cleaning work causes the balance of the equipment with the dust collecting electrode unit in the dry electric dust collector to deteriorate and the dry electric The occupation rate in the dust collector is also increased, which may hinder the improvement of the collection efficiency of the dry electrostatic precipitator.
[0005]
If water is used to remove all dust from the dust collection electrode unit, a large amount of treated water with high nitrogen concentration (caused by dust) is generated, and the burden on the water treatment is large. .
Further, rust and the like are also generated on the surface of the dust collection electrode unit, and this rust is removed by an operator rubbing the surface of the dust collection electrode unit with a brush or the like. However, this method has a heavy load on workers because it involves a bad environment and harsh labor.
[0006]
An object of the present invention is to provide a cleaning device for a dry electrostatic precipitator capable of reliably cleaning without using a large number of injection nozzles, paying attention to the above-mentioned conventional problems.
[0007]
[Means for Solving the Problems]
A cleaning apparatus for a dry electrostatic precipitator according to the present invention is a guide that can be extended in the arrangement direction of the dust collecting electrode unit facing the side edge of the dust collecting electrode unit arranged in parallel with the gas flow path in the dry electrostatic precipitator. A rail is rotatably attached to the dust collector wall surface, and a slider that reciprocates along the guide rail is provided, an injection nozzle is attached to the slider, and a driving means for reciprocatingly rotating the guide rail outside the dust collector is provided. The ejection direction of the nozzle can be swung along the plane of the dust collecting electrode, and a slider drive unit and a feeding drum for the ejection nozzle are provided at the end of the guide rail outside the dust collector.
[0008]
In the above configuration, the spray nozzle may be provided with a cleaning fluid supply means containing cleaning fluid or particles for cleaning the surface of the dust collecting electrode. The particles are preferably dry ice.
[0009]
The slider of the dry electrostatic precipitator cleaning device according to the present invention may be attached to a steel belt fitted in a guide groove provided at the edge of the opening along the longitudinal direction of the guide rail.
[0010]
[Action]
According to the present invention configured as described above, the dust attached to the dust collecting electrode unit can be removed by blowing off by the spraying action from the spray nozzle. Here, if the spray nozzle is swung, the spray direction can be changed, and dust can be removed in a wider range in the dust collecting electrode unit. And dust removal of the said dust collection electrode unit arranged in parallel can be performed by reciprocatingly moving an injection nozzle to the overlapping direction of a dust collection electrode unit.
[0011]
If high-pressure gas is jetted from the jet nozzle, most of the dust adhering to the dust collecting electrode unit can be removed without using water. Therefore, the amount of treated water containing dust can be suppressed, and the load of the water treatment process can be reduced.
[0012]
Further, if particles are sprayed together with the cleaning fluid, in addition to the above action, the particles collide with the surface of the dust collecting electrode unit. Therefore, along with further dust removal, rust generated on the surface of the dust collecting electrode unit ( (By physical collision). These particles are preferably sand, dry ice, etc. Especially if dry ice is used, the dry ice will vaporize after colliding with the surface of the dust collecting electrode unit. Etc. can easily collect the remaining and reduce the separation work of particles and rust.
[0013]
The reciprocating movement of the spray nozzle in the overlapping direction of the dust collecting electrode unit is performed by a slider that reciprocates along the guide rail, and the swing of the spray nozzle is performed by a swing mechanism provided on the guide rail or the spray nozzle. It only has to be done.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments suitable for a dry electrostatic precipitator cleaning device according to the present invention will be described below in detail with reference to the drawings.
FIG. 2 is a top view showing the structure of the cleaning device for the dry electrostatic precipitator according to the present embodiment, and FIG. 3 is a front view and a side view showing the structure of the device.
[0015]
As shown in these drawings, a cleaning device 10 for a dry electrostatic precipitator according to the present embodiment (hereinafter referred to as a cleaning device 10) is attached to the wall surface of the dry electrostatic precipitator and is supported in the dry electrostatic precipitator. A guide rail 12, a slider 14 attached to the guide rail 12 and capable of reciprocating along the longitudinal direction of the guide rail 12, and an injection nozzle 16 attached to the slider 14 and moving together with the slider 14. The main structure.
[0016]
The guide rail 12 includes a slider guide 18 exposed in the dry electrostatic precipitator, a slider drive unit 20 attached to one end of the slider guide 18 and disposed outside the dry electrostatic precipitator, and the slider guide. A slider support portion 22 is attached to the other end of the portion 18 and supports the slider guide portion 18 in a dry electrostatic precipitator.
[0017]
The slider guide portion 18 is made of a hollow frame member having a rectangular cross section, and an opening along the longitudinal direction is formed on a predetermined surface of the constituent surface, and a U-shaped cross section is formed on an edge along the longitudinal direction of the opening. A guide groove 24 is formed. A steel belt, which will be described later, is inserted into the guide groove 24 to reciprocate the slider 14, thereby preventing the steel belt from falling off, and the slider 14 is surely reciprocated. The length of the slider guide portion 18 exposed in the dry electrostatic precipitator is set to 10 m or more, and is set to a length that straddles the dust collecting electrode units arranged in parallel in the dry electrostatic precipitator.
[0018]
The slider drive unit 20 attached to one end portion of the slider guide portion 18 has a cylindrical shape, and is joined to the end surface of the slider guide portion 18 by bolt connection via a joint 26. A mounting flange 30 is provided behind the joint 26 so as to be rotatably supported by a sealing material 28. The mounting flange 30 is mounted in a mounting hole formed in advance on the wall surface, so that the guide rail 12 is provided. The entirety, that is, the slider guide portion 18 and the slider drive portion 20 and the slider support portion 22 are made rotatable.
[0019]
A drive pulley 32 is provided behind the mounting flange 30 inside the slider drive unit 20, and the drive pulley 32 is attached to a rotary shaft 36 of an air motor 34 provided on the side of the slider drive unit 20. In addition, the drive pulley 32 can be rotated together with the rotating shaft 36 by supplying the air motor 34 with a high-pressure gas serving as a cleaning fluid. Note that a rotation detection mechanism 35 is provided at the end of the rotary shaft 36 so that the rotation amount of the drive pulley 32 can be detected. That is, the rotation detection mechanism 35 includes a disk attached to the rotary shaft 36 and having a notch, and a photoelectric sensor that detects the notch, and is driven by the photoelectric sensor detecting the notch on the disk. The amount of rotation of the pulley 32 is obtained. Since the circumference of the drive pulley 32 is known in advance, the amount of reciprocation of the steel belt applied to the drive pulley 32 can be calculated.
[0020]
A feeding drum 40 around which an air hose 38 for supplying high-pressure gas to the injection nozzle 16 is wound is disposed further behind the drive pulley 32, and an air hose is provided inside the slider drive unit 20 and the slider guide unit 18. 38 can be sent out. The take-up drum 40 has a winding mechanism (not shown) incorporated therein, and when the traction force applied to the air hose 38 is released, the air hose 38 is wound by the back tension of the winding mechanism. .
[0021]
Incidentally, the slider support portion 22 attached to the other end portion of the slider guide portion 18 also has a cylindrical shape like the slider drive portion 20, and a driven pulley 42 facing the drive pulley 32 is provided at the inner center portion thereof. ing. The driven pulley 42 is supported by a spring 44 from the tip of the slider support portion 22, so that when a steel belt 46 is applied to the driven pulley 42, a constant tension can be applied to the steel belt 46. It has become. In addition, the joint 26 similar to the slider drive unit 20 is used for coupling the slider support unit 22 and the slider guide unit 18.
[0022]
The steel belt 46 has an endless shape and is applied to a drive pulley 32 provided in the slider drive unit 20 and a driven pulley 42 provided in the slider support unit 22. The end of the steel belt 46 is inserted into the guide groove 24 in the slider guide portion 18, and the relative position of the steel belt 46 relative to the slider guide portion 18 is maintained even when the steel belt 46 is rotated by the rotation of the drive pulley 32. Can be prevented from fluctuating. The material of the steel belt 46 is a stainless steel thin plate from the viewpoint of rust prevention.
[0023]
Incidentally, the slider 14 is bolted to the steel belt 46, and reciprocating along the slider guide portion 18 together with the steel belt 46 is possible by the rotation of the drive pulley 32. The spray nozzle 16 is attached to the slider 14 as described above, and the air hose 38 drawn from the feeding drum 40 is connected to the spray nozzle 16. For this reason, high-pressure gas (compressed air) introduced from a pressure source (compressor) (not shown) is injected from the injection nozzle 16 via the air hose 38 , and the injection nozzle 16 freely moves on the slider guide portion 18 by the slider 14. Can move.
[0024]
In the slider drive unit 20, a rotation arm 48 extending in the radial direction of the slider drive unit 20 is attached to the rear of the mounting flange 30, and the rotation arm 48 is used to rotate the slider drive unit 20. If a rotational moment is applied to the guide rail 12, the guide rail 12 can be rotated. The rotor 50 is provided on the outer surface of the slider drive unit 20 so that no positional deviation occurs between the mounting flange 30 and the slider drive unit 20 supported by the mounting flange 30 via the sealing material 28 by this rotation. In addition, a support member 52 is provided from the mounting flange 30 to guide both surfaces of the rotor 50 with a predetermined gap.
[0025]
Further, the cleaning device 10 configured in this way is supported at the center by the mounting flange 30 and at the tip by the V block 54, so that the guide rail 12 can be rotated and supported. It has become.
[0026]
A procedure for cleaning the dust collecting electrode unit arranged in the dry electrostatic precipitator using the cleaning apparatus 10 configured as described above will be described.
FIG. 1 is an explanatory view of a cleaning operation showing a state in which the dust collecting electrode unit is cleaned by the cleaning device 10, and FIG. 4 is an explanatory diagram showing a structure of the dry electrostatic precipitator and an arrangement state of the cleaning device 10.
[0027]
As shown in these drawings, a plurality of dust collecting electrode units 60 for removing dust are arranged in parallel inside the dry electrostatic precipitator 58, and the cleaning device 10 is attached to a side surface position of the dust collecting electrode unit 60. A plurality of flanges 30 are attached to the wall surface 61.
[0028]
When cleaning the dust collecting electrode unit 60 using the cleaning apparatus 10, first, a high pressure gas is introduced from a pressure source (not shown), and the high pressure gas is injected from the injection nozzle 16. Then, by directing this jet toward the dust collecting electrode unit 60, the dust adhering to the surface of the dust collecting electrode unit 60 is blown off and flies into the dry electrostatic precipitator 58 and then falls to the floor surface. After the cleaning operation of the arbitrary dust collecting electrode unit 60 is performed in this manner, the air motor 34 is operated while maintaining the jetting state, and the jet nozzle 16 is moved together with the slider 14 via the steel belt 46 to the next dust collecting electrode unit 60. What is necessary is just to move to the position. If the injection nozzle 16 is reciprocated along the slider guide portion 18 while injecting the high-pressure gas from the injection nozzle 16 in this way, cleaning of the range of the dust collecting electrode unit 60 to which the high-pressure gas hits can be performed. Then, after the cleaning of the arbitrary range of the dust collecting electrode unit 60 is completed, the guide rail 12 may be rotated using the rotating arm 48 to swing the spray nozzle 16. By causing the spray nozzle 16 to swing as described above, the spraying angle of the high pressure gas changes, and the cleaning operation can be performed for the range of the new dust collecting electrode unit 60 that is not exposed to the high pressure gas.
[0029]
If the swinging operation of the spray nozzle 16 and the reciprocating movement along the slider guide portion 18 are repeated, the dust collecting electrode unit 60 can be cleaned over a wide area. In addition, after the cleaning is completed, dust that has fallen on the bottom surface of the dry electrostatic precipitator 58 is removed and the dust collecting electrode unit 60 is washed with water. Since a large amount of washing water is not generated, the burden on processing can be reduced.
[0030]
FIG. 5 is a structural explanatory view showing an application example of the cleaning apparatus 10. In the present embodiment, the swinging motion of the injection nozzle 16 is performed by the rotational motion of the rotating arm 48. However, the present invention is not limited to this configuration. For example, as shown in FIG. A cylinder 64 may be attached, and the guide rail 12 may be rotated by an expansion / contraction operation of the cylinder 64. Further, the spray nozzle 16 itself may be provided with a swing mechanism, and the dust collecting electrode unit 60 may be cleaned by swinging the spray nozzle 16. Further, a plurality of spray nozzles 16 may be attached to the slider 14 to expand the spray range.
[0031]
In the present embodiment, the high pressure gas is jetted from the jet nozzle 16 and the dust collecting electrode unit 60 is cleaned. However, the present invention is not limited to this mode. Particles such as ice may be blown out from the injection nozzle 16 and collide with the dust collecting electrode unit 60 to remove rust and the like on the surface of the dust collecting electrode unit 60. If dry ice is used as the collision particles, the dry ice vaporizes after colliding with the dust collecting electrode unit 60, so that the inside of the dry electrostatic precipitator 58 is not contaminated, and furthermore, only rust or the like is present on the floor surface. Since it remains, the operation of separating the particles from rust and the like can be omitted.
[0032]
【The invention's effect】
As described above, according to the present invention, the guide rail can be extended in the arrangement direction of the dust collection electrode unit facing the side edge of the dust collection electrode unit arranged in parallel to the gas flow path in the dry electrostatic precipitator. Is attached to the wall surface of the dust collector, and a slider that reciprocates along the guide rail is provided. An injection nozzle is attached to the slider, and driving means for reciprocatingly rotating the guide rail outside the dust collector is provided. Since the jet direction can be given a swing motion along the plane of the dust collecting electrode, and the end of the guide rail outside the dust collector is provided with a slider driving unit and a feeding drum of the jet nozzle, The surface of the dust collecting electrode unit can be cleaned with a simple structure without providing a plurality of spray nozzles.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a cleaning operation showing a state in which a dust collecting electrode unit is cleaned by a cleaning apparatus.
FIG. 2 is a top view showing a structure of a cleaning device for a dry electrostatic precipitator according to the present embodiment.
FIG. 3 is a front view and a side view showing the structure of the apparatus.
FIG. 4 is an explanatory view showing a structure of a dry electrostatic precipitator and an arrangement state of a cleaning device 10;
FIG. 5 is a structural explanatory view showing an application example of the cleaning apparatus 10;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Cleaning apparatus of dry type electrostatic precipitator 12 Guide rail 14 Slider 16 Injection nozzle 18 Slider guide part 20 Slider drive part 22 Slider support part 24 Guide groove 26 Joint 28 Sealing material 30 Mounting flange 32 Drive pulley 34 Air motor 35 Rotation detection mechanism 36 Rotating shaft 38 Air hose 40 Draw-out drum 42 Driven pulley 44 Spring 46 Steel belt 48 Rotating arm 50 Rotor 52 Support member 54 V block 58 Dry type electrostatic precipitator 60 Dust collector electrode unit 61 Wall surface 62 Link mechanism 64 Cylinder

Claims (3)

A guide rail that faces the side edge of the dust collecting electrode unit arranged in parallel to the gas flow path in the dry electric dust collector and can be extended in the arrangement direction of the dust collecting electrode unit is rotatably attached to the dust collector wall surface. A slider that reciprocates along the guide rail is provided, an injection nozzle is attached to the slider, and driving means for reciprocatingly rotating the guide rail is provided outside the dust collector so that the injection direction by the injection nozzle is along the plane of the dust collection electrode. A cleaning apparatus for a dry electrostatic precipitator, characterized in that a swinging motion can be imparted and a slider drive unit and a feeding drum of the spray nozzle are provided at the end of the guide rail outside the dust collector. The cleaning device for an electrostatic precipitator according to claim 1, wherein the spray nozzle is provided with a cleaning fluid supply means containing cleaning fluid or particles for cleaning the surface of the dust collecting electrode. The dry electrostatic precipitator cleaning device according to claim 1, wherein the slider is attached to a steel belt fitted in a guide groove provided at an edge of an opening along the longitudinal direction of the guide rail.

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