Coke Oven Carbon Deposits Growth and Their Burning Off

Abstract

Fig. 1. Experimental set-ups for TG combustion under non-isothermal conditions with natural air draft (a), under isothermal conditions with controlled air flow (b) and the carbon deposit fixed on the sample holder (c).

The dependence of physical structure of a coal heated in a coking chamber on non-uniform distribution of a temperature

“…It seems, that such kind of pyrocarbon coating could be the result of volatile matter deposition only, unlike the carbon deposits on the walls of coke oven. These latter ones are formed from gaseous products as well as from fine particles of coal and mineral matter, and finally are the low ash content mixtures of pyrolytic carbon and chars (Nakagawa et al, 1998) which, according to Zymla and Hottard (2007), are composed of very weakly crystallized carbon forms.…”

Evaluation of the possibilities of applying fractal analysis for the characterization of molecular arrangement of carbon deposits in comparison to conventional instrumental methods

“…On the one hand it has a positive effect on the gas-tightness of ceramics and prevents the raw coking gas from escaping, but on the other hand, it accelerates the damage to the ceramic elements, reduces chamber productivity and increases the resistance while coke is discharged. In practice, while discharging from the coke oven chamber, post-combustion of carbon deposits is controlled by air jets (Zymla and Honnart, 2007). The combustion of carbon deposits is difficult because of high thermodynamic stability and strong adhesion to the silica bricks.…”

“…Some hydrocarbon compounds from volatiles are pyrolytically decomposed under the thermal conditions and deposed as various solid layers in the coke oven. The pyrolytic carbon formation rate is considered to be influenced primarily by the volatile composition, the speed of gas evolution generated during carbonization and the temperature of the brickwork (Krebs et al, 1994;Zymla and Honnart, 2007). The structure of the carbon deposit is dependent on the type of volatile matters, the side of the oven where the sedimentation occurs, the free space temperature distribution, the contact time between hot gases and brickwork and the type of the coke oven.…”

Pyrolytic carbon — Definition, classification and occurrence

“…assumed that the pyrolytic carbon deposited on walls and roofs of coking chamber are formed from gaseous products, as well as from fine particles of coal and mineral matter(Figs 10-12). According toZymla and Honnart (2007), these deposits are composed of weakly crystallized carbon forms with isotropic or very fine mosaic texture Steller et al (2006). andPusz et al (2010) described pyrolytic carbon occurring in metallurgical coke produced in various types of coke ovens.…”