Abstract: In order to analyze the influence of different combinations of liningcross sections and anchors on the temperature distribution of the outer casting of the cracking furnace, this paper combined the structural characteristics of fire brick lining and established respectively the calculation models for hot-faced bricks, hot-faced and back-layered bricks, composite bricks, bricks with tie-back, bricks with tie-back and support plate. The finite element method is applied to analyze the heat transfer process of the models and the results are compared with the standard calculation results. Based on the temperature distribution of the outer casting of the furnace in the calculation results, the deviation of the calculation results between different models is summarized and the influence range of partial hot spot is analyzed. Meanwhile, suggestions for the lining heat transfer calculation during engineering are provided.

Key words: cracking furnace, fire brick lining, finite element, heat transfer