JPH10132251A - Apparatus and method for preventing adherence of ash in stack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically prevent adherence of ash to an inner surface of a stack by providing a driver for driving a rotor rotating in a circumferential direction at an upper part of the stack, and spirally deforming to rotate a rope hung from the rotor in a circumferential direction along the inner surface of the stack by vortex flow of exhaust gas. SOLUTION: A rotor 5 rotatable in a circumferential direction and a motor 6 (driver) for driving the rotor 5 are provided at an upper end of a stack 1. An ash adherence preventing chain 18 (rope) is hung from an end of a handing arm 9 into the stack 1. The chain 18 is spirally deformed in a circumferential direction along an inner surface of the stack 1 by a vortex floro 3 of exhaust gas. And, simultaneously, the motor 6 is driven to rotatably drive one specific supporting roller 7, an outer ring 8 is supported by a plurality of outer rollers 7 to be rotated in the circumferential direction. Hence, the chain 18 is rotatably moved along the circumferential direction in the stack 1 via the arm 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for preventing ash deposition in a chimney of a refuse incineration plant or the like.

[0002]

2. Description of the Related Art In recent years, chimneys of refuse incinerators and the like are often made of steel. In refuse incinerators, since the exhaust gas in the chimney is usually after passing through a dust collector, the ash Is a minute amount of fine particles. However, there has been a problem that the ash gradually adheres to the inner surface of the chimney to form an ash layer after a long operation, and the ash layer peels off and scatters. In addition, due to the heat insulation effect of the ash layer, the temperature of the inner surface of the chimney is lowered, and low-temperature corrosion due to dew condensation is generated on the inner surface of the chimney, forming a rust layer, and the rust layer is separated and scattered. Also occurred.

In order to reduce the adhesion of ash to the inner surface of the chimney and low-temperature corrosion, the inner surface of the chimney is coated with a heat-resistant and acid-resistant coating, or corrosion-resistant steel is used for the material of the chimney. Even if this was taken, it was not possible to prevent ash from adhering, so the inside of the chimney was regularly cleaned by sandblasting.

[0004]

However, in the above-mentioned conventional type, periodic cleaning by sand blast or the like is required, so that the cleaning work is troublesome, and furthermore,
The incinerator had to be shut down for cleaning.
In addition, other than immediately after cleaning, ash attached to the inner surface of the chimney may peel off and scatter, and rust generated due to low-temperature corrosion may peel off and scatter, so it was necessary to increase the frequency of cleaning. In addition, heat- and acid-resistant coating requires periodic repainting, and the repainting work is time-consuming.

Accordingly, an object of the present invention is to prevent ash from automatically adhering to the inner surface of a chimney without labor.

[0006]

Means for Solving the Problems To achieve the above-mentioned object, according to the first aspect of the present invention, a rotating body which is rotatable in a circumferential direction on an upper part of a chimney, A drive device for driving is provided, and a rope body for preventing ash deposition is hung from the rotating body into the chimney, and when a swirl flow of exhaust gas is generated in the chimney, the rope body turns the exhaust gas. It is characterized by being deformed and rotated helically in the circumferential direction along the chimney inner surface by the flow.

[0007] According to this, the rope body is helically deformed and rotated in the circumferential direction along the inner surface of the chimney by the swirling flow of the exhaust gas, and is also rotated in the circumferential direction by the rotation of the rotating body. And slide evenly. This can automatically prevent ash from adhering to the chimney inner surface.

Further, according to a second aspect of the present invention, the rotating body is provided outside the chimney and supported by a plurality of supporting rollers so as to be rotatable in the circumferential direction. And a suspension arm to which the upper end of the rope body is connected, and the driving device rotates the outer ring in the circumferential direction.

According to this, since the outer ring is rotated in the circumferential direction by the driving device while the outer ring is supported by the plurality of support rollers, the rope body is rotated in the chimney via the suspension arm in the circumferential direction.

Further, according to a third aspect of the present invention, the rotating body is provided inside the chimney and supported by a plurality of supporting rollers so as to be rotatable in the circumferential direction. And a suspension arm to which the upper end of the rope body is connected, and the driving device rotates the inner ring in the circumferential direction.

According to this, since the inner ring is rotated in the circumferential direction by the driving device while the inner ring is supported by the plurality of support rollers, the rope body is rotated in the chimney in the circumferential direction via the suspension arm.

Furthermore, the invention according to claim 4 is characterized in that a chain is used as a cord. Further, the invention according to claim 5 hangs a cord for preventing ash deposition in the chimney, and flows into the chimney while rotating the upper end portion of the cord in a circumferential direction by a rotating body provided in the chimney. The rope body is helically deformed and rotated in the circumferential direction by the swirling flow of the exhaust gas, and is slid on the inner surface of the chimney.

Furthermore, the invention according to claim 6 is characterized in that a chain is used as a cord.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a chimney installed in a refuse incineration facility or the like.
An exhaust duct 2 provided downstream of the dust collector is connected. When the exhaust gas flows from the exhaust duct 2 into the chimney 1, the flow A of the exhaust gas flowing into the chimney 1 is normally asymmetrically biased, so that a swirling flow 3 of the exhaust gas is naturally generated inside the chimney 1.

At the upper end of the chimney 1, a rotating body 5 rotatable in the circumferential direction, and a motor 6 for driving the rotating body 5
(An example of a driving device). The rotating body 5
An outer ring 8 provided outside the upper end of the chimney 1 and rotatably supported in a circumferential direction by a plurality of support rollers 7;
A suspension arm 9 attached to the outer ring 8 and having a tip protruding above the chimney 1 is constituted. Each of the support rollers 7 is disposed outside the chimney 1 and at a plurality of locations in the circumferential direction, and the support shaft 10 and the support shaft 1
Of the chimney 1 via a bearing 11 for rotatably holding the
Are respectively provided on the support bases 12 attached to the outer peripheral surface.

Further, a driven pulley 14 provided on a driving shaft of the motor 6 and a driven pulley 1 provided on a supporting shaft 10 of one specific supporting roller 7 among a plurality of supporting rollers 7.
A drive belt 16 is wound between the pulleys 14 and 15 and the pulleys 14 and 15 are driven by driving the motor 6.
The specific support roller 7 is driven to rotate via the drive belt 16 and the support shaft 10, and the outer ring 8 rotates in the circumferential direction. The motor 6 is mounted on a mount 17 mounted on the outer peripheral surface of the chimney 1.

A chain 18 (an example of a cord) for preventing ash deposition is suspended from the tip of the suspension arm 9 into the chimney 1. The chain 18 is helically deformed in the circumferential direction along the inner surface of the chimney 1 by the swirling flow 3 of the exhaust gas.

The operation of the above configuration will be described below.
The chain 18 is deformed spirally in the circumferential direction along the inner surface of the chimney 1 by the swirling flow 3 of the exhaust gas, and by driving the motor 6, one specific supporting roller 7 is driven to rotate, and the outer ring 8 is supported by the plurality of support rollers 7 and rotates in the circumferential direction, so that the chain 18 rotates and moves in the chimney 1 along the circumferential direction via the suspension arm 9. Thus, the chain 18 slides uniformly around the inner surface of the chimney 1 in the circumferential direction, and automatically prevents ash from adhering to the inner surface of the chimney 1.

Further, since the rotating body 5 is constituted by the outer ring 8 and the suspension arm 9, the upper part of the chimney 1 is not blocked by the rotating body 5 and the flow of exhaust gas is not obstructed. The exhaust gas inside passes through the outer ring 8 and is smoothly discharged upward. Further, the only power required to prevent ash adhesion is the power of the motor 6 that drives the outer ring 8 to rotate at a low speed, which is economical.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. The rotating body 25 includes an inner ring 26 provided inside the upper end of the chimney 1 and rotatably supported in the circumferential direction by a plurality of support rollers 7, and a downward hanging arm 27 attached to the inner ring 26. It is composed of Each of the support rollers 7 is disposed inside the chimney 1 and at a plurality of positions in the circumferential direction. The support shaft 10 inserted into the support roller 7 and a bearing that rotatably holds each support shaft 10 outside the chimney 1. 11 are provided on support tables 12 attached to the outer peripheral surface of the chimney 1, respectively. Each of the bearings 11 is attached to each of the support bases 12, and the tip of each of the support shafts 10 penetrates the wall 28 of the chimney 1 from outside to inside and is inserted into each of the support rollers 7.

By driving the motor 6 (an example of a driving device), the specific support roller 7 is rotated via the pulleys 14 and 15 and the driving belt 16 in the same manner as in the first embodiment described above. When driven, the inner ring 26 is configured to rotate in the circumferential direction.

The operation of the above configuration will be described below.
The chain 18 is spirally deformed in the circumferential direction along the inner surface of the chimney 1 by the swirling flow 3 of the exhaust gas, and by driving the motor 6, one specific supporting roller 7 is driven to rotate, and the inner ring is rotated. 26 is supported by the plurality of support rollers 7 and rotates in the circumferential direction.
8 rotates inside the chimney 1 along the circumferential direction. Thus, the chain 18 slides uniformly around the inner surface of the chimney 1 in the circumferential direction, and automatically prevents ash from adhering to the inner surface of the chimney 1.

Further, since the rotating body 25 is constituted by the inner ring 26 and the suspension arm 27, the upper portion of the chimney 1 is not blocked by the rotating body 25 and the flow of exhaust gas is not obstructed. Exhaust gas inside passes through the inner ring 26 and is smoothly discharged upward. Further, the power required for preventing ash adhesion is only the power of the motor 6 for rotating and driving the inner ring 26 at a low speed, which is economical.

Further, in the first or second embodiment of the present invention, as shown in FIG. 2, the flow A of the exhaust gas flowing from the exhaust duct 2 into the chimney 1 is asymmetrically biased.
The swirl flow 3 of the exhaust gas is naturally generated inside the chimney 1, but the swirl flow 3 of the exhaust gas may be generated as follows. That is, as shown in FIG. 4 as a third embodiment of the present invention, the flow A of the exhaust gas flowing from the exhaust duct 2 to the chimney 1 is guided in a predetermined direction to the inflow portion from the exhaust duct 2 to the chimney 1. A guide plate 35 is provided, and the exhaust gas is guided by the guide plate 35 to flow in a predetermined direction. As a result, the exhaust gas flows into the chimney 1 as a deviated flow, and a swirl flow 3 of the exhaust gas is generated inside the chimney 1. Let it.

As a fourth embodiment of the present invention, as shown in FIG. 5, a hot air fan 38 for blowing hot air B in a tangential direction from the lower side of the chimney 1 to the inside of the chimney 1 is provided. Hot air B is blown tangentially into the interior of the chimney 1 so that the swirl 3
May be generated.

Further, as a fifth embodiment of the present invention, there is a fifth embodiment in which the outer ring 8 is rotated by another driving method as shown in FIG. That is, a plurality of engagement rods 39 are radially attached to the outer peripheral surface of the outer ring 8 supported by the plurality of support rollers 7. Further, a plurality of (four in FIG. 6) drive levers 40 that engage with the engagement rods 39 are mounted in a cross shape on the drive shaft of the motor 6 (an example of a drive device). A flange 41 is provided on each of the support rollers 7, and a guide body 42 that fits between the two flanges 41 is provided on the lower surface of the outer ring 8 over the entire circumference.

According to this, when the motor 6 is driven, the driving lever 40 is engaged with the engaging rod 39 while rotating, so that the outer ring 8 is supported by the plurality of support rollers 7 and rotates in the circumferential direction. The chain 18 is rotationally moved in the chimney 1 along the circumferential direction via the suspension arm 9.

In each of the above-described embodiments, the chain 18 is used as an example of a cord body for preventing ash adhesion. However, the chain 18 is not limited to the chain 18. You may use what was made.

Further, in each of the above embodiments, the chimney 1 of the refuse incineration equipment is used, but a similar ash adhesion preventing device may be provided for the chimney 1 of a power plant or a chemical plant. In each of the above-described embodiments, a specific one of the plurality of support rollers 7 is driven to rotate by the motor 6, but two or more support rollers 7 are driven to rotate by the motor 6. May be.

In each of the above embodiments, the motor 6 is used as an example of the driving device, but a cylinder or the like may be used.

[0031]

As described above, according to the first aspect of the present invention, the rope body is helically deformed and rotated in the circumferential direction along the inner surface of the chimney by the swirling flow of the exhaust gas. Since the rotating body rotates in the circumferential direction due to the rotation of the rotating body, the rotating body slides uniformly in the circumferential direction with respect to the inner surface of the chimney. As a result, ash can be automatically prevented from adhering to the inner surface of the chimney, so that ash separation and scattering and low-temperature corrosion can be prevented, periodic cleaning by sand blasting or the like is not required, and the incinerator is stopped for cleaning. There is no need. Also, there is no need to apply heat- and acid-resistant coating to the chimney inner surface. Further, the power required for preventing ash adhesion is only the power of the driving device for rotating the rotating body at low speed, which is economical.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a device for preventing ash deposition in a chimney according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the chimney for explaining that a swirling flow of exhaust gas is generated in the chimney.

FIG. 3 is a longitudinal sectional view of a device for preventing ash deposition in a chimney according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a chimney according to a third embodiment of the present invention, for explaining another means for generating a swirling flow of exhaust gas in the chimney.

FIG. 5 is a cross-sectional view of a chimney according to a fourth embodiment of the present invention, for explaining another means for generating a swirling flow of exhaust gas in the chimney.

FIG. 6 is a longitudinal sectional view of an apparatus for preventing ash deposition in a chimney according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chimney 3 Swirling flow 5 Rotating body 6 Motor (drive device) 7 Support roller 8 Outer ring 9 Suspended arm 18 Chain (cord body) 26 Inner ring 27 Suspended arm

Claims (6)

[Claims] 1. A rotating body rotatable in a circumferential direction and a driving device for driving the rotating body are provided above a chimney,
When a rope for preventing ash deposition is suspended from the rotator into the chimney and a swirling flow of exhaust gas is generated in the chimney, the rope is rotated around the chimney inner surface by the swirling flow of exhaust gas. A device for preventing ash deposition in a chimney, characterized by spirally deforming and rotating in a direction. 2. A rotating body is provided outside the chimney, and is rotatably supported in a circumferential direction by a plurality of supporting rollers. The rotating body is attached to the outer ring, and an upper end of a cable body is connected to a tip of the outer ring. The apparatus for preventing ash deposition in a chimney according to claim 1, wherein the apparatus comprises a hanging arm, and the outer ring is rotated in a circumferential direction by a driving device. 3. The rotating body is provided inside the chimney and supported by a plurality of supporting rollers so as to be rotatable in the circumferential direction. The rotating body is attached to the inner ring and the upper end of the cable body is connected to the tip thereof. The apparatus for preventing ash deposition in a chimney according to claim 1, wherein the apparatus comprises a hanging arm, and the inner ring is rotated in a circumferential direction by a driving device. 4. The apparatus for preventing ash deposition in a chimney according to claim 1, wherein a chain is used as a cord. 5. A cable body for preventing ash adhesion in a chimney,
While rotating the upper end of the cable body in the circumferential direction by the rotating body provided in the chimney, the cable body is helically deformed and rotated in the circumferential direction by the swirling flow of the exhaust gas flowing into the chimney, and with respect to the chimney inner surface. A method for preventing ash adhesion in a chimney, characterized by sliding by sliding. 6. The method for preventing ash deposition in a chimney according to claim 5, wherein a chain is used as a cord.