宁津县鑫丰化工有限公司

Causes of Coal Bunker Lining
The coal bunkers used to store coal at the docks of coal mines and power plants in my country are basically made of concrete. Their surfaces are not smooth and have a large coefficient of friction and high water absorption, which often causes adhesion and blockage of the bunker. main reason. Especially in the case of soft coal mining where the pulverized coal contains 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 wet coal powder first adheres to the bunker wall, and is superimposed layer by layer, and finally forms in the bunker. Similar to the shape of a rat hole, 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, its 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.
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 and steel plates on the bunker walls, using air cannons
or electric hammers Even though they were beaten, it could not be completely solved, and manual poking of the coal bunker often caused personal casualties
Principles of coal bunker lining performance
After a lot of research and experiments, it was finally decided to use
plates as coal bunker linings The silo lining utilizes the self-lubricating and non-stick properties of the plate to reduce the friction coefficient and solve the problem of silo 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, variations in length are allowed and a smooth plastic surface is formed in the silo, which facilitates the flow of materials.
Pay special attention when installing the coal bunker lining
During the installation process, the bolt countersunk plane of the lining must be lower than the plate surface
When installing the coal bunker lining product, do not use bolts per square meter. Should be less than 0. The gap between each lining board should not be larger than After storing to two-thirds of the entire bin capacity, unload the material.
During operation, it is necessary to always keep the material pile in the warehouse at the material entering and dropping point, and always keep the material storage volume in the warehouse at more than half of the entire warehouse capacity.
It is strictly forbidden for materials to directly impact the lining plate.
The hardness particles of various materials are different. Materials and flow rates must not be changed at will. If changes are needed, they must not be greater than the original design capacity. Changing materials or flow rates at will will affect the service life of the liner.
The operating ambient temperature should generally not be greater than ℃.
Do not use external force to damage its structure or loosen fasteners at will.
The resting time of materials in the bin should not exceed 1 hour (please do not stay in the bin for more viscous materials to prevent agglomeration. For materials with less than 100% water content, the resting time can be appropriately extended.
When the temperature is low, , please pay attention to the rest time of the material in the bin to avoid the generation of frozen blocks.
The solution effect of coal bunker lining
The use of many coal mines and power plants in Henan, Shandong, Shanxi, Hebei and other provinces has shown that it can effectively solve the problem of blocking the bunker. problem, the effective utilization rate of its coal bunkers has been improved from phenomenon, reducing the labor intensity of workers, and the social and economic benefits are significant.
The role of coal bunker linings in coal-fired power generation
The coal bunker is an important part of the pulverizing system of coal-fired thermal power plants In large and medium-sized unit power plants, most of the coal bunkers in the main building are made of steel and steel plates. As the materials flow in the bunker, the friction with the bunker wall steel plate can easily cause damage to the wall. At the same time, the rough surface of the steel plate can easily cause coal blockage. . Therefore, when designing the inner wall of the coal bunker, consideration is given to adding a layer of smooth coal bunker lining with a wear resistance ~ times higher than that of ordinary steel plates, in order to extend the service life of the coal bunker and reduce the maintenance rate. For Taiwan's unit, its main The capacity of the coal bunker in the factory is approximately