Prediction of coke oven wall pressure

Internal gas pressure (IGP) developed by coking coals upon carbonisation accounts for oven wall pressure (OWP). If not controlled, this OWP may be potentially dangerous as it can easily exceed the 10 kPa acceptable limit. In this work, a simple, physically based, expression of IGP in a slot-type coke oven is presented, validated on data available in literature and modified into a ready-to-use expression of OWP fitted on measurements from the movable wall pilot oven of the Centre de Pyrolyse de Marienau (CPM) over a wide range of single coals. Expressed as a function of coal characteristics and carbonisation conditions, this OWP prediction is accurate enough to serve as a process tuning tool. However, probably because additivity rule does not apply easily to inert content, the model fails to predict OWP in case of blends. Extrapolation from the pilot oven to the industrial oven has been proved.