Thursday, April 2, 2009

Carbonization

Carbonization is coal slowly combustion in airless condition. If the result of carbonization is a hard block so the result named coke, if the result of coal firing is a powder, that powder named char. Carbonization happen when the firing without oxygen availability or very low oxygen content inside burner.

Coal firing can do in low carbonization temperature – LTC that is done temperature under 700 oC while HTP is done in temperature above 900 oC. Also the combustion may do in between that temperature (medium temperature carbonization).




HTC is applied on metallurgical coke production, that is consumed for iron and steel industry. LTC applied to produce coke that is used for household because coke is not smoke when burning (smokeless). The side product of this process is tar that can be used for chemical industry. Good coal for this process are lignites, sub-bituminous and high-volatile bituminous.

Carbonization process is done in coke oven on about 1100 oC, without any air circulate for about 24 – 20 hours. Gas and liquid that is resulted from coke firing than can be se used for fuel. Raw material that is used is prime cooking coal or coal mix that contains of caking and certain caking properties with coal and non-coking coal.

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