Technologies for improvement in Coking process in Byproduct Coke Ovens Jul31

Technologies for improvement in Coking process in Byproduct Coke Ovens...

Technologies for improvement in Coking process in Byproduct Coke Ovens Coking coals are converted to coke in large byproduct coke oven batteries. The coking process consists of heating blend of crushed coking coals in the absence of air to drive off the volatile compounds. The resulting coke is a hard, but porous carbon material which is used for the reduction of iron bearing materials in a blast furnace. The byproduct coke oven also recovers volatile chemicals in the form of coke oven gas, ammonium sulphate, tars, and oils. In last three to four decades several technologies have been developed which have not only resulted into vast improvements in the process of coking in the byproduct coke oven batteries but also have improved the quality of produced metallurgical coke. Majors of these technologies are given below. Selective crushing of coals This technology is a theoretically sound technology and aims at controlling the degree of crushing of the different constituents of coal.  It aims to improve homogeneity of reactive and inert components in coal. The reactive components of coals are primarily vitrinites and are the softest constituents while the mineral matters of coals are the hardest components. In conventional coal crushing units, the vitrinites get crushed to a relatively finer size compared to mineral matter constituents when the entire coal is crushed together. For producing coke of higher quality, it is desirable to crush the mineral matter finer than the vitrinite component of the coal so that during the process of coking, when the coal charge softens, the mineral matter is assimilated better, leading to the improved strength. This is usually carried out by crushing of coals in two stages. This technology is helpful when coals are petrographically heterogeneous. Coal moisture control Coal moisture control uses...