I am fabricating coal briquettes of high-volatile, high-sulfur (7.5%) bituminous coal. I have found a silver colored and shiny agglomeration of char residue left behind after heating raw coal at 950 C during volatile analysis. Free swelling index of raw coal is 1.5, showing its only caking coal (not coking). During cold briquetting, I have used 16% hydrated lime, and 4-6 % bentonite clay along with 15% charcoal, 3% carbonized rice husk, 1% sodium nitrate salt, and 4 to 6 % water. During combustion of the dried briquettes, I have noted that only volatiles of the outer layer of briquettes have been combusted, and the inner portion of the pillow shaped briquettes remains uncombusted. I need a technical assistance for the complete combustion of the briquettes.
Il faut que les briquettes soient aérée en preparants des formes cylindrique et augmentant la surface avec oxygene
Incomplete combustion might be due to the high particle size and dense material. If the briquettes size is high than heat transfer from outer layer to the core of briquettes will decreases and hence, incomplete combustion takes place.
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