Analysis of the thermal performance of the lining and the reasons for its destruction in petroleum coke calcination furnaces

This article discusses the thermal technological processes occurring in petroleum coke calcination furnaces, as well as issues of causes of destruction of the refractory material of the calcination furnace lining. The survey showed that the main factors influencing the duration of the work campaign of the lining are the temperature stresses that arise in the lining during sudden temperature changes during heating or cooling, as well as the chemical effect of the process material on the lining. It was revealed that in the inlet zone, where the drying of technological raw materials is carried out, the wear of the lining occurs evenly, and there is no significant damage. On thermal imaging images, this zone is displayed as uniform temperature fields on the outer surface of the furnace. In the calcination zone, the lining is characterized by the presence of main cracks that run along the seams. These cracks indicate the occurrence of significant thermal stresses when the furnace is heated. Work was done to determine the dependence of tensile strength on temperature, in the temperature range from 20 oC to 650 oC. Analysis of the results of determining the tensile strength showed a general tendency for it to increase with increasing temperature. This is explained by changes in the structure of the refractory material with increasing temperature and load. Taking into account the obtained dependence of the tensile strength on temperature allows one to adjust the heating schedules of the calcination furnace to reduce the temperature stress during the heating process