JP3197751U - Particle adhesion prevention transport pipe - Google Patents

Abstract

Disclosed is a particulate adhesion-preventing transport pipe in which a particulate layer formed on the inner wall of a particulate adhesion-preventing transport pipe can be easily removed and can prevent clogging. A transport pipe 1 for preventing adhesion of fine particles is installed on an upper part of a coal mill 7. Coal is introduced from the inlet of the particulate adhesion preventing transport pipe 1 and pulverized by the coal mill 7 into particulates. As the coal is repeatedly charged, the fine particles in the coal adhere to and accumulate on the rubber chute on the inner wall of the fine particle prevention transport pipe 1 to form a fine particle layer. When the fine particle layer is formed, the compressed air supply valve 2 is opened, and the compressed air is sent into the pressure hose 4 provided between the outer wall 5 of the fine particle adhesion preventing transport pipe 1 and the inner wall 6 formed of a rubber chute. The pressure hose 4 is closed at the tip by a hose end stopper 8. The pressure hose 4 expands and the rubber chute expands by the compressed air sent, and the fine particle layer formed on the rubber chute surface peels off. Then, it can drop off and blockage in the particulate adhesion preventing transport pipe 1 can be prevented. [Selection] Figure 1

Description

  The present invention relates to a particulate adhesion preventing transport pipe having a high blocking prevention effect.

  Currently, cement plants use coal to produce cement clinker. The coal is put into a coal mill through a rubber feed pipe (hereinafter referred to as “coal feed pipe”) and pulverized to produce pulverized coal. However, since the fine particles in the coal are likely to adhere to the inner wall of the coal feed pipe, the coal feed pipe is blocked by a layer (hereinafter referred to as “fine particle layer”) that has grown due to the fine particles adhering to the coal feed pipe. Occasionally there were occasions when entry was hindered.

Therefore, until now, in order to remove the fine particle layer, the operation of the coal mill is stopped, a cleaning pipe is inserted into the coal feed pipe from the top to the bottom of the coal feed pipe, and compressed air is injected. I was cleaning the inside of the coal delivery pipe. However, this cleaning method has the following problems.
(I) The rubber inner wall of the coal feed pipe was easily damaged by the cleaning pipe and the jet of compressed air.
(Ii) Since cleaning is performed from the upper part of the coal feeding pipe, the cleaning pipe does not reach the lower part of the coal feeding pipe, and the particulate layer formed at the lower part is difficult to remove.
(Iii) When the particulate layer cannot be removed by jetting compressed air, the operation of the coal mill is stopped, the worker enters the coal mill, and the particulate layer formed in the lower part of the coal inlet pipe is removed manually. It was.
(Iv) When the operation of the coal mill is stopped, heavy oil is used as an alternative to coal, but using heavy oil increases the cost, and the chemical components of the residue after combustion contained in heavy oil and coal differ. The chemical composition of the cement clinker incorporating the residue varied.
Therefore, in the cement manufacturing site, in order to solve the above problem, a coal feed pipe having a high blocking prevention effect has been demanded.
In connection with this, for example, Patent Document 1 proposes a means for peeling and removing the powder lump attached to the inner surface of the inner tube in pneumatic transportation with the elastic inner tube.

JP 05-201538 A

  Therefore, the subject of this invention is providing the particulate adhesion prevention transport pipes, such as a coal inflow pipe which can remove the particulate layer formed in the inner wall of a pipe | tube easily, and can prevent obstruction | occlusion.

  The inventor has studied various means for solving the above-mentioned problems. As a result, a pressure hose is provided between the outer wall of the particulate adhesion prevention transport pipe and the inner wall formed by the rubber chute. It is found that if compressed air is sent into the pipe at any time, the rubber chute swells due to the expansion of the pressure hose, and the fine particle layer adhering to the chute easily peels off and falls off, thereby preventing clogging in the particulate adhesion prevention transport pipe. The present invention has been completed. That is, the present invention is a particulate adhesion preventing transport pipe having the following configuration.

[1] Fine particles formed by attaching pressure-resistant hoses in the length direction of the pipe at least at two opposite positions between the outer wall of the transport pipe for preventing adhesion of fine particles and the inner wall formed of a rubber chute. Anti-adhesion transport pipe.

  The particulate adhesion preventing transport pipe of the present invention can easily peel off the particulate layer formed in the particulate adhesion preventing transport pipe, and can prevent clogging in the particulate adhesion preventing transport pipe.

It is sectional drawing which shows an example of a particulate adhesion prevention transport pipe in the state installed in the coal mill.

  In the present invention, as described above, the pressure hose is provided in the length direction of the pipe between the outer wall of the particulate adhesion preventing transport pipe and the inner wall formed by the rubber chute and at two opposite positions. This is a particulate adhesion preventing transport pipe. Hereinafter, the present invention will be described with reference to FIG.

The particulate adhesion preventing transport pipe 1 according to the present invention is installed in the upper part of the coal mill 7. Coal is introduced from the inlet of the particulate adhesion preventing transport pipe 1 and pulverized by the coal mill 7 into particulates. As the coal is repeatedly charged, the fine particles in the coal adhere to and accumulate on the rubber chute on the inner wall of the fine particle prevention transport pipe 1 to form a fine particle layer.
When the fine particle layer is formed, the compressed air supply valve 2 is opened, and the compressed air is sent into the pressure hose 4 provided between the outer wall 5 of the fine particle adhesion preventing transport pipe 1 and the inner wall 6 formed of a rubber chute. The pressure hose 4 is closed at the tip by a hose end stopper 8. The pressure hose 4 expands and the rubber chute expands by the compressed air sent, and the fine particle layer formed on the rubber chute surface peels off. Then, it can drop off and blockage in the particulate adhesion preventing transport pipe 1 can be prevented.
After dropping off the fine particle layer, the compressed air in the pressure hose is discharged by closing the compressed air supply valve 2 and opening the exhaust valve 3, and the rubber chute returns to the initial circular shape. By repeating this operation depending on the state of adhesion of the fine particle layer, the adhesion of the fine particle layer can be prevented.
Further, the pressure hose 4 is provided between the outer wall 5 and the inner wall 6 so as to be opposed to at least two positions. The larger the number of pressure hoses 4 is, the easier the fine particle layer is peeled.

1 Particle adhesion prevention transport pipe 2 Compressed air supply valve (solenoid valve)
3 Exhaust valve (solenoid valve)
4 Pressure hose 5 Outer wall 6 Inner wall (rubber chute)
7 Coal mill 8 Hose end clamp 9 Each solenoid valve control panel (can be set arbitrarily with a timer)

Claims (1)

  A pressure hose is provided in the length direction of the pipe between at least two opposing positions between the outer wall of the particulate adhesion preventing transport pipe and the inner wall formed by the rubber chute. , Transport tube for preventing adhesion of fine particles.

Images