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Causes of coal bunker linings
The coal bunkers used to store coal in coal mines, power plants and docks in my country are basically made of concrete. Their surfaces are not smooth, have large friction coefficients and are water absorbent
Coal bunker linings
High, this is the main reason that often causes sticking and clogging. Especially when soft coal is mined, there is a lot of pulverized coal, and there is a lot of moisture, the silo blocking accident is particularly serious. []
Forms of coal bunker blocking
There are two common forms of coal bunker blocking: one is that the wet coal powder is first bonded to the bunker wall, then stacked layer by layer, and finally A shape similar to a rat hole is formed in the bunker, and reloading coal will cause the bunker to be blocked. Another reason is that the internal friction resistance between the wet coal powder blocks is large, and the external friction resistance between it and the bunker wall is also large. When the coal bunker is filled with coal, Finally, the coal outlet of the lower conical section forms an arched shape (commonly known as a bridge) that is similar to being stuck and rusted. When the gate is opened to discharge coal, only a very small part can be put down, and the upper coal will block the warehouse due to arching.
In coal mining enterprises in cold northern regions, if cold protection measures are limited in winter, it is easy for the moisture-containing materials to freeze together with the warehouse wall, causing the warehouse to become blocked.
3 Consequences of coal bunker blockage
In order to solve the problem of coal bunker blockage over the years, people have also thought of many ways: such as laying ceramic tiles on the bunker wall, laying steel plates, and hitting with air cannons or electric hammers. , have not been completely solved, and manual poking of coal bunkers often causes personal casualties
Principles of coal bunker lining performance
After a lot of research and experiments, it was finally decided to use plates as the lining of the coal bunker. The self-lubricating and non-stick properties of the plate can reduce the friction coefficient and solve the problem of clogging.
Coal bunker lining installation method
Use nails to fix large pieces of sheet material on the bunker wall, thus completely solving the problem of coal bunker sticking and blocking. Generally, it is not necessary to cover the entire warehouse. As long as the lower conical section of the coal bunker is placed and the upper round bunker is paved with about 1 meter of lining, the bunker blockage caused by rat holes and arching can be solved.
Precautions for installing coal bunker lining
When installing coal bunker lining, in the case of large changes in operation or ambient temperature, the fixed form of the lining must take into account its free expansion or contraction. Any fixing method should be designed to facilitate the flow of bulk materials, and the screw head nuts should always be embedded in the liner. For thicker linings, the seams should be cut to size. In this way, changes in length are allowed and a smooth plastic plane is formed in the silo, which is conducive to the flow of materials.