I would like to ask about the requirements regarding the fineness and moisture level of coal used in coking
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Our plant uses SCD43-04 type dual-bottom injection single-hot-type ramming coke ovens. Currently, the coal mix consists of 13% rich coal, 15% 3/1 coking coal, 40% high-sulfur coal, and 32% lean coal; the fineness of these coals ranges from 88 to 91, while their moisture content is between 10 and 11%. I would like to ask: if the fineness were reduced to between 85 and 87, could lowering the fineness improve the bulk density of the coal cakes, thereby enhancing their strength in the process of ramming coke production?； If the moisture content of the blending coal is between 6 and 8, can reducing this moisture level increase the bulk density of the coal briquettes, thereby enhancing the strength of the coke? ； I hope everyone will share their experiences and insights regarding the role of coking in conjunction with coal crushing, moisture content, and fineness. I am seeking the help of my colleagues so as to gain more knowledge!
Reply to 1# 1iutao: If the fineness of the coal fed into your furnace reaches over 89, the moisture content can be appropriately reduced to 9–10
May I ask the original poster: which design institute designed the SCD43-04 type coke oven? Please be sure to tell me.
In my opinion, the fineness should be around 90, or rather between 87 and 93, with the coal moisture content ranging from 9 to 11
For ramming coking, it is best to maintain a fineness level of over 88, as this is beneficial for the strength of the coke. Additionally, the moisture content of the coal should not be too low; around 10 is ideal. Either too low a moisture level or too low a fineness level hinders the ramming process and affects the amount of coal that can be loaded as well as the proper operation of the furnace temperature.
The particle size (below 3 mm) should be over 85%, and the moisture content is preferably around 10%; otherwise, it will increase the amount of coal caking
The moisture content in the material used for coking should be between 9–11%; too low a moisture level prevents the formation of coal cakes. The particle size should be similar to that in top-charging coking; particles smaller than 3 mm should account for over 90% of the total. The advantage of briquetted coke over top-loaded coke is that it allows for the use of finer coal
To increase the bulk density, the weight of the rammer and the number of ramming passes can be increased.