Balanço térmico como parâmetro de controle do processo de coqueificação.

Abstract

In a semi integrated mill steel industry that iron ore reduction is by coke, the coke plant has a fundamental role since this mineral coal processment as raw material until this coke be delivered to the use in the Blast Furnace. Coke Plant produces coke from coal pyrolysis, where coke oven gas (COG) is injected in a chamber next to the oven and generates termal energy to process from combustion with atmospheric air. It has been known COG is the second highest factor that most adds cost to coking process, standing behind from coal blend price. Since the structure is made of refractory, a refined thermal control is desired in order that the plant may have its lifespan extended and the heat consumption at each coking cycle might be enough to ensure that does not exist waste nor bulk of coal not pyrolyzed. This work aims develop, validate and aplicate the Heat Balance in order to optimize the heat consumption per tonne of dry coal charged in a plant composed by 50 ovens localized at brazilian territory. This tool will work as support for maintain Coke battery’s temperature changes inside of a region pre-determined certifing a coke with great production condition and great battery preservation. The model development contain all factors analysis that contribute with the thermal energy injection or thermal energy lost at the control volume. Structured on eletronical woorkbooks it was expected, also as result, indicate to thermal control staff the ideal settings of COG flux on the process, leading to costs reductions and coke quality increase.