JPH11304375A - Anti-clogging device for exhaust pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-clogging device for exhaust pipe in which fine particles can be prevented from adhering to the inner circumferential surface of a gas exhaust pipe under a stage where am exhaust gas source is operating. SOLUTION: The anti-clogging device comprises an exhaust pipe 13 extending upward while being coupled with an exhaust gas source 12 and coupled, at the upper part thereof, with an exhaust pipe 14 extending laterally, a rotary drive source 15 disposed at the upper end of the exhaust pipe 13, and a flexible or bendable wire 18 suspended down into the exhaust pipe 13 from a position eccentric to the rotary shaft 16 of the rotary drive source 15. The rotary drive source 15 turns the wire 18 spirally to rub the inner circumfererntial surface of the exhaust pipe 13 thus preventing adhesion of line particles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe blockage prevention device for preventing blockage of a pipeline due to adhesion of fine particles in exhaust gas.

[0002]

2. Description of the Related Art Radioactive waste liquid generated in a nuclear facility is treated as vitrified waste by a waste liquid treatment facility and then stored in a radioactive waste storage facility.

In the above waste liquid treatment equipment, a radioactive waste liquid is mixed into a molten glass obtained by melting a raw glass in a glass melting furnace, and the molten glass mixed with the radioactive waste liquid is poured into a solidified container, and the molten glass is melted. Is solidified to form a vitrified body.

FIG. 3 shows an example of a glass melting furnace. In this glass melting furnace, a melting space 1 having a shape in which a horizontal opening cross section is gradually reduced from an intermediate portion in a vertical direction to a lower portion is formed inside. A melting furnace body 2 made of a refractory material,
A heater 3 installed at the upper part of the melting furnace main body 2 for heating the melting space 1 and a liquid level meter 4 for detecting a liquid level in the melting space 1
And

[0005] A raw material supply pipe 5 for supplying glass raw material to the melting space 1 is provided at an upper portion of the melting furnace main body 2.
A waste liquid supply pipe 6 for supplying waste liquid to the furnace and a gas discharge pipe 7 for supplying gas generated in the melting space 1 to gas processing equipment (not shown) are provided.

[0006] A lowering nozzle 8 is provided below the melting furnace main body 2 for flowing the molten glass G mixed with the waste liquid from the melting space 1 into a solidified container (not shown).

Around the falling nozzle 8, the falling nozzle 8
An induction heating coil 9 for heating the
A cooling air injection pipe 10 for injecting cooling air to the downstream nozzle 8 is arranged near the downstream nozzle 8.

In the above-mentioned melting furnace body 2, exhaust gas containing fine particles generated from the molten glass G heated by the heater 3 passes through the gas discharge pipe 7 from the melting space 1 inside the melting furnace body 2. Not sent to gas processing equipment.

When the temperature of the downflow nozzle 8 is not raised by the induction heating coil 9, the glass is solidified inside the downflow nozzle 8, so that the flow of the molten glass G from the melting furnace main body 2 to the outside does not occur. Will be blocked.

When the temperature of the falling nozzle 8 is raised to a temperature equal to or higher than the melting point of the molten glass G by the induction heating coil 9, the solidified glass in the falling nozzle 8 is melted, and the molten glass in the melting furnace body 2 is melted. G flows down through the downflow nozzle 8 to the outside.

Further, after the heating of the downflow nozzle 8 by the induction heating coil 9 is stopped, and the cooling air is injected from the cooling air injection pipe 10 to the downflow nozzle 8, the downflow nozzle 8
As the temperature decreases, the glass solidifies inside the flow-down nozzle 8, and the flow of the molten glass G from the melting furnace body 2 to the outside stops.

[0012]

However, in the glass melting furnace shown in FIG. 3, fine particles such as glass contained in the exhaust gas adhere to the inner surface of the vertically extending portion of the gas discharge pipe 7. When the thickness of the adhesion layer of the fine particles increases with time, the gas discharge pipe 7 may be closed and the flow of gas may be hindered.

For this reason, conventionally, a flexible wire is reciprocated in a gas discharge pipe 7 by a motor, or a reamer is pushed into the gas discharge pipe 7, so that the inner circumference of a vertically extending portion of the gas discharge pipe 7 is increased. Fine particles attached to the surface were removed.

However, in the operation of removing fine particles while the melting furnace main body 2 is operated, it is difficult to maintain the negative pressure of the radioactive waste treatment apparatus. Therefore, the operation of the melting furnace main body 2 is stopped to remove the fine particles. I had to.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an exhaust pipe obstruction capable of suppressing adhesion of fine particles to the inner peripheral surface of a gas exhaust pipe while an exhaust gas source such as a melting furnace body is operated. It is intended to provide a prevention device.

[0016]

In order to achieve the above object, an invention according to a first aspect of the present invention includes an exhaust pipe connected to an exhaust gas source and connected to a discharge pipe extending upward and extending laterally upward. A rotary drive source installed at the upper end of the exhaust pipe, and a flexible or bendable linear body suspended in the exhaust pipe from a position eccentric to the rotation axis of the rotary drive source. When the rotary drive source is operated, the upper end of the striated body is turned, and the striated body moves in contact with the inner peripheral surface of the exhaust pipe, and the inside of the exhaust pipe is Suppresses the attachment of fine particles to the peripheral surface.

According to a second aspect of the present invention, there is provided the exhaust pipe blockage prevention device according to the first aspect, wherein the linear body extends below the lower end of the exhaust pipe, and a weight is attached to the lower end of the linear body. In this case, the tension on the striated body increases, and the striated body comes into contact with the inner peripheral surface of the exhaust pipe with a strong force, and the deterrence force against the attachment of fine particles increases.

According to a third aspect of the present invention, there is provided the exhaust pipe blockage prevention device according to any one of the first and second aspects, wherein the rotary shaft of the rotary drive source is directed downward. The inner peripheral surface is rubbed to evenly prevent fine particles from adhering to the inner peripheral surface of the exhaust pipe.

According to a fourth aspect of the present invention, there is provided the exhaust pipe blockage preventing device according to any one of the first and second aspects, wherein the rotary shaft of the rotary drive source is directed sideways. At the same time as the vibration is applied, the inner peripheral surface of the exhaust pipe is rubbed to prevent fine particles from adhering to the inner peripheral surface of the exhaust pipe.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an embodiment of an exhaust pipe blockage prevention device according to the present invention, and an exhaust gas source 1 such as a melting furnace body.
An exhaust pipe 13 extending upward is connected to the upper part of the second. A discharge pipe 14 extending in the lateral direction is connected near the upper part of the discharge pipe 13 and is connected to a gas processing facility (not shown).

At the upper end of the exhaust pipe 13, a rotary drive source 15 such as a motor is installed with the rotary shaft 16 inserted downward into the exhaust pipe 13. A disk 17 is horizontally fixed to the end of the rotating shaft 16, and from a position eccentric to the rotating shaft 16 on the lower surface of the disk 17, a flexible line such as a chain as shown by a two-dot chain line is shown. A strip 18 is suspended in the exhaust pipe 13.

The striated body 18 may be, in addition to a chain, one formed by linking a number of short rods, or one having flexibility such as a steel cord, and the striated body 18 may be a lower end of the exhaust pipe 13. The lower end of the filament 18 has a weight 19 attached thereto.

The upper end of the exhaust pipe 13 is sealed with a cover 20 that covers the outside of the rotary drive source 15 in order to maintain a negative pressure.

Next, the operation of the exhaust pipe blockage prevention device shown in FIG. 1 will be described.

Exhaust gas containing fine particles generated by an exhaust gas source 12 such as a melting furnace main body is supplied to an exhaust pipe 1 extending upward.
After rising inside 3, it is fed to a gas treatment facility (not shown) through a lateral discharge pipe 14.

When the rotary drive source 15 provided at the upper end of the exhaust pipe 13 is driven to rotate, the disk 17 fixed to the rotary shaft 16 rotates horizontally, and the disk 17 is rotated with respect to the rotary shaft 16 on the lower surface of the disk 17. The upper end of the filament 18 suspended from the eccentric position is swung in a horizontal circle.

For this reason, as shown by a solid line in FIG. 1, the striated body 18 rotates as a whole as a vertical spiral, and rubs the entire inner peripheral surface of the exhaust pipe 13 extending in the vertical direction. Therefore, the fine particles contained in the exhaust gas passing through the exhaust pipe 13 are prevented from adhering to the inner peripheral surface of the exhaust pipe 13.

When the weight 19 is attached to the lower end of the striated body 18, the tension on the striated body 18 increases, and the striated body 18 rubs the entire inner peripheral surface of the exhaust pipe 13 with a strong force. In other words, the deterrence against the attachment of fine particles is increased.

When the degree of adhesion of the fine particles contained in the exhaust gas to the inner peripheral surface of the exhaust pipe 13 is high, the rotary drive source 15 is constantly driven to rotate while the exhaust gas source 12 is in operation. When the degree of adhesion of the fine particles contained in the inner peripheral surface of the exhaust pipe 13 is low, the rotation driving source 1
5 may be rotated at any time.

FIG. 2 shows another embodiment of the exhaust pipe blockage preventing apparatus according to the present invention, in which the same parts as those in FIG. 1 are denoted by the same reference numerals.

In this exhaust pipe blockage prevention device, the rotary shaft 16 of the rotary drive source 15 installed at the upper end of the exhaust pipe 13
Is horizontal, and a disk 17 is fixed to an end of the rotating shaft 16 so as to be positioned on a vertical plane.

From a position eccentric to the rotating shaft 16 of the disk 17 located on the vertical plane, a linear member 18 such as a chain is suspended in the exhaust pipe 13 as shown by a two-dot chain line. I have.

In the exhaust pipe blockage preventing device shown in FIG. 2, when the rotary drive source 15 is driven to rotate, the disk 17 fixed to the rotary shaft 16 rotates in a vertical plane, and the rotary shaft 16 on the lower surface of the disk 17 rotates. The upper end of the striated body 18 suspended from the eccentric position is swung in a vertical circle.

For this reason, the striated body 18 is vibrated up and down to vibrate the exhaust pipe 13 to shake off the attached fine particles and to have a vertical spiral shape as shown by a solid line in FIG. To perform a rotary motion and also perform an operation of rubbing the entire inner peripheral surface of the exhaust pipe 13, thereby suppressing the fine particles contained in the exhaust gas passing through the exhaust pipe 13 from adhering to the inner peripheral surface of the exhaust pipe 13.

It should be noted that the exhaust pipe blockage prevention device of the present invention is not limited to the above-described embodiment, but the present invention is applicable to an electric furnace for melting metals and the like other than glass. Of course, changes can be made without departing from the spirit of the invention.

[0037]

As described above, according to the exhaust pipe blockage prevention device of the present invention, various excellent effects as described below can be obtained.

(1) In any of the exhaust pipe blockage preventing apparatuses according to the first to fourth aspects of the present invention, the flexible or flexible linear body suspended in the exhaust pipe is exhausted. Since the rotating source is turned during the operation of the generating source to prevent the fine particles contained in the exhaust gas from adhering to the inner peripheral surface of the exhaust pipe, the gas exhaust pipe does not become blocked.

(2) In the exhaust pipe blockage prevention device according to the second aspect of the present invention, since the tension is applied to the linear body by the weight, the contact force of the linear body with the inner peripheral surface of the gas discharge pipe is reduced. As a result, the adhesion of fine particles to the inner peripheral surface of the exhaust pipe can be effectively suppressed.

(3) In the exhaust pipe blockage preventing device according to the third aspect of the present invention, since the rotary shaft of the rotary drive source is directed downward, the linear member uniformly slides on the inner peripheral surface of the exhaust pipe, and the exhaust gas is exhausted. Fine particles can be effectively prevented from adhering to the inner peripheral surface of the tube.

(4) In the waste pipe blockage prevention apparatus according to the fourth aspect of the present invention, since the rotation axis of the rotary drive source is horizontal, the exhaust pipe vibrates due to the contact of the linear body, and Adhesion of fine particles to the peripheral surface can be effectively suppressed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of an exhaust pipe blockage prevention device of the present invention.

FIG. 2 is a longitudinal sectional view showing another example of the embodiment of the exhaust pipe blockage prevention device of the present invention.

FIG. 3 is a longitudinal sectional view showing an example of a glass melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Exhaust gas generation source 13 Exhaust pipe 14 Exhaust pipe 15 Rotation drive source 16 Rotation axis 18 Striatal body 19 Weight

Claims (4)

[Claims] 1. An exhaust pipe connected to an exhaust gas source and connected to an exhaust pipe extending upward and extending laterally upward, a rotary drive source installed at an upper end of the exhaust pipe, and the rotary drive. An exhaust pipe blockage prevention device, comprising: a flexible or bendable linear body suspended in the exhaust pipe from a position eccentric to a rotation axis of a source. 2. A wire body extending below a lower end of the exhaust pipe, and a weight attached to a lower end of the wire body.
The exhaust pipe blockage prevention device according to any one of the above. 3. The exhaust pipe blockage prevention device according to claim 1, wherein the rotation axis of the rotation drive source is downward. 4. The exhaust pipe blockage prevention device according to claim 1, wherein a rotation axis of the rotation drive source is lateral.