How to choose a crusher for different types of coal
Thread Content
For weakly caking coal, the damage caused by too low fineness is the main issue; it should be finely ground； For highly caking coals, the main drawback caused by excessive fineness is significant, and they should be crushed coarsely. Rich coal and coking coal are brittle and easy to break, while bituminous coal is harder and more difficult to break. Therefore, bituminous coal and coking coal are suitable for coarse crushing, while gas coal should be finely crushed. When blending coal, it is necessary to decide which type of crushing machinery to use for different types of coal – how to make that choice? ! The fineness should reach around 90%
Is the process you chose to first powder it and then mix it?
Going back to the second floor – it’s the selective crushing process
The poster can choose the process of powdering first and then mixing; its advantage is that it allows different grinding particle sizes to be controlled according to the requirements of various coal qualities.
Selective crushing can be carried out before coal blending, followed by another round of crushing after blending.
The process schemes for conventional coal preparation systems mostly adopt a single-stage crushing approach. First, various types of washed coking coal are precisely mixed according to the specified coal blending ratio using electronic automatic batching scales in the coal blending bin, and then sent to a crusher for crushing. This method is widely used, and its technology is mature and reliable. The coal preparation process adopted involves finely grinding coal types with poor cohesion, such as bituminous coal and anthracite, using a reversible counterhammer crusher. This ground coal is then mixed with coking coal, which has good cohesion and has not been ground, and the resulting mixture is fed into another counterhammer crusher for further crushing. Thus, blended coals with different particle sizes can be obtained. In blended coal, the coking coal should have larger particle size compared to weakly bonded coal. Weakly bonded coal fills the gaps between coking coal particles, resulting in an optimal particle size distribution for the blended coal and an increased bulk density of it. Coking coal with good bonding properties wraps around coals with poor bonding properties such as anthracite and bituminous coal. The coal preparation process of primary crushing is widely used, and the technology is highly mature. But so far, the proportion of unbound coal in this coal preparation scheme combined with the ramming coal loading process can only reach 10–15%. The two-stage crushing coal preparation process can optimize the particle size distribution of the blended coal, increase its bulk density, and ensure thorough intermingling of coking coal and anthracite. Therefore, by combining ramming coal loading with rapid heating technology for coke ovens, the proportion of bindless coal can be increased by about 40%. If the price difference between coking coal and binder-free coal is 150 yuan per ton, a company that produces 1 million tons of coke per year can save 60 million yuan in raw material costs annually, resulting in significant economic benefits. In addition, the two-stage crushing coal preparation process is highly effective in conserving the increasingly scarce coking coal resources and expanding the sources of coal suitable for coking. Through the above comparative analysis, the coal preparation process scheme using two-stage crushing exhibits clear advantages.