1991 Volume 77 Issue 8 Pages 1243-1250
The deviation in the carbonization rate in the coke oven chamber has been investigated by use of test coke ovens and a two-dimensional mathematical model.
In the measurement using a 250 kg test coke oven, there observed deviation of plastic layer in many points during the carbonization in the case of a wet coal charge, but in the case of a dry coal charge, three was no point of delay in carbonization and the carbonization progressed uniformly. It was considered that the deviation of the carbonization arises from localized flow of steam through the plastic layers and coke layers.
In order to evaluate flow pattern and heat transfer caused by the steam and the decomposition gas during carbonization, a two-dimensional gas flow mathematical model was developed. This model consists of mass, energy and momentum balance equations in both the gas and solid phases. It was confirmed that temperature change, changes in gas pressure and steam flow pattern in a test coke oven with the upper heating wall were estimated by this model. In the model calculation, the coke fissures affected the steam flow and caused a deviation in the carbonization rate.