Study on Heating Behaviour of Coal during Carbonization in Non-Recovery Oven

The coking process is based on the transformation of coal into coke at high temperature. In non-recovery coke oven, heating is usually asymmetric, this may be due to the fact that heating is provided by controlled combustion of volatile matter of charged cake at oven crown and sole flue.In the present investigation, a simplified temperature profiles were simulated to typical temperature profiles of the non-recovery coke oven. The selection criterions of ovens were based on the oven temperature and coking time. Based on measurement of heating pattern, a numerical methodology was proposed for predicting temperature of the intermediate point by using Lagrange interpolation method. Further, a MATLAB-based algorithm was used to predict the same heating pattern based on actual temperature profile in a non-recovery oven. The model was tested and validated with actual temperature profile of six industrial ovens. The model also reproduces the main feature of the measured temperature profile and shown good agreement with experimental data of industrial oven. The predicted temperature profile can discriminate different operating conditions and works well even at low level of temperature deviation. These variations will affect the heating rate and coking cycle, superimposed on the oven crown and sole temperature pattern. However, the operating temperatures were the most important factor for normal operation and found that the heating rate of normal operation was varied in the range of 1.06 -0.62℃/min at a height of 200mm from top & bottom and centre of the charged cake.