JPH11337685A - Exhaust pipe blocking preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust pipe blocking preventing device, capable of surely preventing the adhesion of fine particles on the inner surface of the exhaust pipe. SOLUTION: A shut-off device 16, which is capable of opening and closing and attached to the upper end of an exhaust pipe 14 having an exhaust pipe 15 extending upward and horizontally connected to an exhaust gas generating source 13 and an inner pipe 21 detachably mounted in the exhaust pipe 14 are provided. By having the inner pipe 21 exchange, the inner surface of the exhaust pipe 14 is maintained in a state in which fine particles do not adhere.

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. 4 is a vertical sectional view showing 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 provided. Furnace body 2 made of refractory material formed in
And a pair of electrodes 3 provided so as to face the sides of the melting furnace main body 2 and a liquid level meter 4 for detecting the liquid level of the melting space 1, with the molten glass G interposed between the two electrodes 3. By applying a current, the temperature of the molten glass G is maintained at a temperature equal to or higher than the melting point.

[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 melting furnace body 2 described above, exhaust gas containing fine particles generated from the molten glass G is sent from the melting space 1 inside the melting furnace body 2 to a gas processing facility (not shown) through a gas discharge pipe 7. Be paid.

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 temperature 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. 4, fine particles such as glass contained in the exhaust gas adhere to the inner peripheral surface of the vertically extending portion of the gas discharge pipe 7. However, when the thickness of the adhesion layer of the fine particles increases with the passage of time, the gas discharge pipe 7 may be closed and the flow of gas may be hindered.

For this reason, conventionally, a flexible wire brush is reciprocated in the gas discharge pipe 7 by a motor, or a reamer is pushed into the gas discharge pipe 7 so that a portion extending in the vertical direction of the gas discharge pipe 7 is formed. Either remove the fine particles attached to the side surface, or form an air film by flowing air in a thin film along the inner surface of the gas discharge pipe 7,
The attachment of the fine particles to the inner surface of the gas discharge pipe 7 is prevented.

However, the removal of fine particles using a flexible wire brush or a reamer complicates the apparatus configuration and has a problem in durability and operability due to the high temperature of the use environment.

Further, the prevention of the adhesion of fine particles by the air film does not always prevent the adhesion of fine particles.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide an exhaust pipe blockage preventing device capable of reliably preventing fine particles from adhering to the inner peripheral surface of the exhaust pipe.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to an exhaust pipe having an exhaust pipe connected to an exhaust gas source and extending upward and having a laterally extending upper part. The present invention relates to an exhaust pipe blockage prevention device having an attached openable / closable shutoff device and an insert tube detachably mounted in the exhaust pipe. The shutoff device is opened to discharge the insert tube from the upper end of the exhaust pipe. When installed on the inner peripheral surface of the pipe, closing the shut-off device and operating the exhaust gas source, fine particles in the exhaust gas emitted from the exhaust gas source adhere to the inner peripheral surface of the inner tube, so by replacing the inner tube, In addition, the inner peripheral surface of the exhaust pipe can maintain a state in which fine particles do not adhere.

According to a second aspect of the present invention, the upper end of the insertion tube mounted in the exhaust pipe extends to near the lower part of the shutoff device, and the lower end of the insertion tube extends to the lower end portion in the exhaust pipe. 2. An exhaust pipe blockage prevention device according to claim 1, wherein an opening communicating with the exhaust pipe is provided in the exhaust pipe, and the inner peripheral surface of the exhaust pipe is mounted over substantially the entire length of the inner peripheral surface of the exhaust pipe. Exhaust gas from the exhaust gas source is prevented from adhering to the whole, and the exhaust gas flowing from the exhaust gas source flows into the discharge pipe through the opening of the insertion pipe and is discharged.

According to a third aspect of the present invention, there is provided the exhaust pipe blockage prevention device according to the first aspect, wherein a ridge is fixed to an outer surface of the inner tube, and a step portion for supporting the ridge is formed on an inner surface of the exhaust pipe. In mounting the intubation on the inner peripheral surface of the exhaust pipe, the positioning of the intubation can be performed accurately and easily by the ridges and the steps.

[0020]

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

FIGS. 1 to 3 show an embodiment of an exhaust pipe blockage prevention apparatus according to the present invention. The upper portion of an exhaust gas source 13 such as a melting furnace main body has a substantially uniform inner diameter over its entire length. An exhaust pipe 14 sized and extending upward is connected.

An exhaust pipe 15 extending obliquely upward and then extending in the lateral direction is connected near the upper portion of the exhaust pipe 14, and is connected to a gas processing facility via an exhaust device (not shown).

At the upper end of the exhaust pipe 14, a shutoff device 16 such as a valve, which can be opened and closed, is mounted. Above the shutoff device 16, a short connecting pipe 17 having substantially the same inside diameter as the exhaust pipe 14 is provided.
Are attached so as to be located on an extension of the exhaust pipe 14.

The shut-off device 16 has a valve element 18 provided therein, and the valve element 18 is provided with a passage 19 having substantially the same inner diameter as the exhaust pipe 14. FIG. 1 shows an open state in which the passage 19 faces in the vertical direction and the upper end of the exhaust pipe 14 communicates with the connection pipe 17, but when the handle 20 is turned upward or downward by 90 degrees, the valve element 18 is turned. Is the handle 20
As a result, the passage 19 turns in the horizontal direction and closes the upper end of the exhaust pipe 14.

When the above-mentioned shut-off device 16 is opened, the inner pipe 21 can be inserted into the inner peripheral surface of the exhaust pipe 14 through the connecting pipe 17 and the passage 19 of the valve element 18.

The outer diameter of the inner tube 21 is made close to the inner diameter of the exhaust pipe 14, and as shown in FIG.
A hanging rod 22 is diametrically fixed to the upper inner surface of the pipe, and a hook 23 such as an overhead crane is engaged with the hanging rod 22 to suspend the inner pipe 21 and exhaust pipe 14.
Can be hung on the inner peripheral surface of the vehicle.

At this time, as shown in FIG. 1, the space between the hook 23 and the connecting pipe 17 is covered with a transparent film 24 of transparent polyethylene, vinyl chloride or the like. Avoid leakage to the outside.

The inner tube 21 is formed to have a length close to the length of the exhaust pipe 14, and as shown in FIG.
A strip-shaped ridge 25 is fixed to the outer surface of the inner tube 21. Further, an opening 26 is formed in the side surface of the inner tube 21.

In FIG. 3, reference numeral 27 denotes a closing plate which closes the inside of the intubation tube 21 immediately above the opening 26.

On the other hand, on the inner surface of the exhaust pipe 14, as shown in FIG.

As described above, when the shut-off device 16 is opened and the inner tube 21 is inserted into the inner peripheral surface of the exhaust pipe 14,
The protrusion 25 fixed to the outer surface of the inner intubation 21 is
The inner tube 21 is supported by a step 28 formed on the inner surface of the exhaust tube 4, and is mounted at a predetermined position in the exhaust pipe 14.

In this position, as shown in FIG.
1, the lower end of the insertion tube 21 is located at the lower end of the inner peripheral surface of the exhaust pipe 14, and the opening 26 on the side surface of the insertion tube 21 is To the height of the position connected to. When the insertion tube 21 is rotated in the horizontal direction in this state, and the opening 26 is aligned with the position where the discharge tube 15 is connected to the exhaust pipe 14, almost the entire inner peripheral surface of the exhaust pipe 14 is covered with the insertion tube 21. The lower end of the inner tube 21 is open to the exhaust gas source 13, and the opening 26 on the side surface of the inner tube 21 is connected to the discharge tube 15.

Further, the protruding ridge 25 described above is
Is inscribed in a position above the connection point of the exhaust pipe 15 of the exhaust pipe 14 in a state where is engaged with the step portion 28.
The seal member 29 prevents fine particles from entering the shut-off device 16.

As described above, the inner pipe 21 is provided around the inner circumference of the exhaust pipe 14.
And the shut-off device 16 attached to the upper end of the exhaust pipe 14 is closed, so that the exhaust gas source 1
When the gas turbine 3 is operated, the exhaust gas containing fine particles generated by the exhaust gas source 13 passes through the inside of the insertion tube 21 and then enters the discharge tube 15 through the opening 26 on the side surface of the insertion tube 21, and the gas treatment equipment (not shown) Sent to

The fine particles such as glass contained in the exhaust gas do not adhere to the inner peripheral surface of the exhaust pipe 14 but adhere to the inner peripheral surface of the insertion tube 21.

When the thickness of the adhered layer on the inner peripheral surface of the inner tube 21 has reached an allowable limit, the space between the hook 23 and the connecting tube 17 is covered with a film 24 as shown in FIG. With the blocking device 16 in the open state, the hook 23 is lowered into the upper end of the exhaust pipe 14 and engaged with the suspension rod 22.

Then, the hook 23 is raised, and the intubation 21
Is taken into the space covered by the film 24 through the open blocking device 16 and the connection pipe 17.

Next, the lower part of the film 24 is squeezed and closed just above the connecting pipe 17, and the upper part of the film 24 is opened to take the inner tube 21 taken into the space covered with the film 24 together with the hook 23. Pull out above 24.

Next, a new intubation tube 21 is hung by a hook 23 and inserted into the space covered with the film 24 from above, and the upper end of the film 24 is squeezed and closed. When opened, the lower part of the space covered with the film 24 communicates with the inside of the connection pipe 17.

In this state, the hook 23 is lowered and the connection pipe 1
7. The insertion tube 21 is inserted into the exhaust pipe 14 through the blocking device 16 in the open state, and a ridge 25 fixed to the outer surface of the insertion tube 21 is formed on the inner surface of the exhaust pipe 14 as shown in FIG. The insertion tube 21 is rotated in the horizontal direction to adjust the opening 26 to a position where the discharge pipe 15 is connected to the exhaust pipe 14.

When the hook 23 is removed from the hanging rod 22 and raised to close the shut-off device 16, a new exhaust gas from the exhaust gas generating source 13 such as the melting furnace body is prevented from leaking to the outside. The exchange operation for the inner tube 21 is completed, and the exhaust gas source 13 such as the melting furnace body can be operated in a state where fine particles are not attached to the inner peripheral surface of the inner tube 21.

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.

[0043]

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 preventive devices according to the first to third aspects of the present invention, fine particles are not attached to the inner peripheral surface of the exhaust pipe by replacing the insert pipe. Since the state can be maintained, no blockage occurs in the exhaust pipe.

(2) In the exhaust pipe blockage preventing apparatus according to the second aspect of the present invention, the upper end of the inner pipe extends to near the lower part of the shutoff device, and the lower end of the inner pipe extends to the lower end of the exhaust pipe. Therefore, it is possible to effectively prevent the fine particles from adhering to the inner peripheral surface of the exhaust pipe over substantially the entire exhaust passage in the exhaust pipe.

(3) Since the projection of the insertion tube is supported by the step of the exhaust pipe, the positioning of the insertion tube with respect to the exhaust pipe can be performed accurately and easily.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the upper part of the intubation in FIG.

FIG. 3 is a sectional view of an opening protruding portion of the intubation in FIG. 1;

FIG. 4 is a longitudinal sectional view showing an example of a glass melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Exhaust gas generation source 14 Exhaust pipe 15 Exhaust pipe 16 Shut-off device 21 Inner pipe 25 Protrusion 26 Opening 28 Step

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G21F 9/30 519 G21F 9/30 519K

Claims (3)

[Claims] 1. An openable and closable shut-off device attached to an upper end of an exhaust pipe having an exhaust pipe connected to an exhaust gas source and extending upward and extending laterally upward, and detachably mounted in the exhaust pipe. An exhaust pipe blockage prevention device comprising: an inserted intubation tube. 2. An upper end of an insertion tube mounted in an exhaust pipe extends to a position near a lower portion of a shutoff device, and a lower end of the insertion tube extends to a lower end portion in the exhaust pipe, and a side surface of the insertion tube communicates with a discharge pipe. 2. The exhaust pipe blockage prevention device according to claim 1, wherein an opening is provided. 3. The exhaust pipe blockage prevention device according to claim 1, wherein a ridge is fixed to an outer surface of the inner tube, and a step supporting the ridge is formed on an inner surface of the exhaust pipe.