Abstract: The excessive thermal stress is one of the most important factors for the damage of the refractory lining in the gasifier.Analysis of temperature distribution and stress distribution of refractory lining can effectively avoid the stress concentration and optimize the structure of refractory lining.The threedimensional numerical model of K-brick of the industrial opposed multi-burner (OMB) coal-water slurry (CWS) entrained flow gasifier is established,and the effects of heat load on the temperature,equivalent stress,equivalent elastic strain and total deformation distribution of refractory lining and steel shell during steady state are studied by finite element method (FEM).When the end face temperature of the hot-face brick is 1 300 ℃,the temperature of the steel shell is calculated to be 206.4 ℃,and the simulation results are well consistent with the industrial data.The equivalent stress of various linings follows the order:hot-face brick > backup brick > steel shell > heat isolation brick.The equivalent elastic strain of the ceramic fiber is the largest.The absolute deformation of heat isolation brick is much smaller than that of hot-face brick and backup brick.With the increases of the end face temperatures of hot-face brick from 1 100 ℃ to 1 400 ℃,the overall temperatures of refractory lining and steel shell increase.The external surface temperature of the steel shell increases gradually from 177.2 ℃ to 220.9 ℃,and the temperature change does not exceed 50 ℃.The overall equivalent stress of refractory lining and steel shell increase.The equivalent stress also increases,especially for hot-face brick,the enhancement of stress is the biggest,and the equivalent stress of the end face of hot-face brick increases from 0.68 GPa to 1.1 GPa.The equivalent elastic strain increases gradually and the strain of the hot-face brick and backup brick increases more greatly than that of heat isolation brick.The absolute deformation of the hotface brick,backup brick and heat isolation brick also increase.As the thickness of hot-face brick increases from 60 mm to 230 mm,the overall temperatures of refractory lining and steel shell are decreased.The external surface temperature of steel shell decreases slowly from 225.9 ℃ to 206.4 ℃,and it can be seen that the thickness of hot-face brick has little effect on the surface temperature of steel shell.The equivalent stress of hot-face brick and backup brick decreases rapidly while the stress of heat isolation brick and steel shell is only reduced a little.When the thickness of the hot-face brick is 180 mm,the overall stress of the hot-face brick is moderate,and the distribution is uniform without obvious mutation.The equivalent elastic strain of refractory lining decreases gradually,and the declining trend of strain in the region of backup brick is the fastest,and the strain result is consistent with the stress result.The absolute deformation of various linings follows the order:backup brick>hot-face brick>heat isolation brick.Combined with the results of temperature field,equivalent stress and equivalent elastic strain,it is proposed that the structure of hot-face brick is optimal when the thickness of hot-face brick is 180 mm,which is most conducive to improving the service life of hot-face brick and refractory lining.