JPS6242783A - Method for air cleaning of coal-water slurry piping - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for cleaning air in pipes for transporting highly concentrated coal-water slurry.

[Conventional technology] In order to improve the handling of pulverized coal, a highly concentrated coal-water slurry (in which pulverized coal is dispersed at a high concentration in water) has been developed.
CWM) has come into use.

The use of CWM transport piping is intermittent, as the CWM is usually stored in a storage tank and supplied to the burner when in use, or is received into the storage tank from a ship or tank car.

Therefore, after the CWM has been transported, compressed air is supplied each time to push out the CWM remaining in the piping.

[The pinnacle of the invention's solution] However, since the CWM remains attached to the inner surface of the pipe in the form of a film, if left as is, the CWM attached to the film will dry and solidify.

It is also possible to flush the inside of the piping with water after flowing compressed air, or to flow water instead of compressed air.
The cost is high because water is used for 5 meters, and it takes time and money to treat 5 meters of washing wastewater. Alternatively, there is a risk that the CWM will hard back during water purging.

[Means for Solving the Problems 1] In order to solve the above-mentioned conventional problems, in the present invention, compressed air containing water droplets is made to flow through the coal-water slurry pipe.

[Function] CWM is removed by exposing water droplets in the air to the CWM attached to the inner wall of the pipe. In addition, it is possible to remove residual CWM by purging with air, but a water purge does not require any water and can reduce cleaning waste water.

[Example] First, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing the implementation state of the present invention, and CW
A water inlet 3 is provided near the compressed air inlet 2 of the pipe 1 for transporting M, and a water supply line 4 is connected to the water inlet 3. In the figure, 5 indicates the water (Jξ supply line 45Ω) valve.

With the above configuration, after the CWM has been transported through the pipe 1, J stiff water is injected little by little into the water supply line 4 from the water inlet 3 into the pipe 1, and compressed air is injected from the compressed air inlet 2. [Effects of the Invention] As explained above, according to the air cleaning method for coal water slurry piping of the present invention, the injected water is atomized and flows over the entire length of the pipe 1. Since slurry piping is cleaned with compressed air containing water droplets, CWM remaining inside the piping can be pushed out without drying the CWM adhering to the inner surface of the piping, and cleaning waste water can also be reduced, making it possible to clean Various problems caused by water washing can be solved, and various excellent effects can be achieved, such as reliable effects at low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the method of the present invention. 1 indicates the distribution, 2 indicates the compressed air inlet, 3 indicates the water inlet, 4 indicates the water supply line, and 9 indicates the membrane coal water slurry. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) An air cleaning method for coal-water slurry piping, which comprises flowing compressed air containing water droplets through the coal-water slurry piping.