Reasons for coal collapse
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In rammed coke ovens, after the coal cakes are compacted, coal collapse occurs during the coal charging process. What exactly are the causes of this? Including aspects such as moisture and fineness control, as well as ramming operations
According to relevant literature, moisture and fineness have a significant impact on the inverted cake, followed by the ramming time
It seems there were previous discussions on the fact that factors such as moisture content, fineness, the methods of handling the coal, the distance between the coal support plates and the bottom of the carbonization chamber, expansion of the coal storage tanks, and the alignment of the coal pushers can all cause coal collapse to varying degrees. Right?
Could you specify what the levels for moisture and fineness control are? What is the distance between the coal carrying plate and the bottom of the carbonization chamber?
What is the appropriate level for moisture and fineness control? One more question: is it better to have a rammer that is mobile or one that is fixed?
We keep the moisture content at 10–13% and the fineness at 85–92%.
Our moisture level is kept between 9.5 and 10.5, and the fineness isn’t as high as yours, but the quality of the coke is still satisfactory.
We generally keep the moisture content of coal at around 10–13%, and the fineness at around 88–92%. The ramming process is adjusted accordingly to the conditions of the coal: more ramming is required when the moisture content is low, and less ramming when it is high. The surface of the coal tank must be smooth with no coal sticking to it, and the distance between the coal support plate and the bottom of the carbonization chamber should not exceed 20 mm.
In my opinion, the main factors are the compaction density, along with the moisture content of the coal and the particle size of the coal mixture!
It mainly depends on moisture and particle size, as well as the type of coal; it also matters whether there is a higher proportion of bituminous coal, subbituminous coal, and weakly caking coal, with a lower proportion of rich coal
Moisture, bulk density, friction during coal loading