Numerical simulation for size optimization of refractory support frame in OMB gasifier

摘要

The refractory support frame in opposed multi-burner (OMB) gasifier is used to support the refractory bricks. However, excessive thermal stress in OMB gasifier at high temperature will damage it and cause refractory bricks to collapse. The effect of size and structure on the thermal stress of refractory support frame has remained unclear. A three-dimensional physical structure model of industrial refractory support frame was established. The numerical simulation of temperature distribution and thermal behavior with different thickness and length of the support plate was detailedly investigated by the analysis modules of steady-state thermal and static structural through ANSYS. When the temperature of end face of hot-face brick was 1300°C, the outer surface temperature of steel shell was 210.4°C, which matched well with the measured temperature. As the thickness of support plate increased, the equivalent stress at the center of support plate gradually decreased. With increasing the length of support plate, the value and whole saltation of stress were both the smallest at the length of 230 mm. The optimal size of support plate which was beneficial to decrease the stress and prolong the service life of the refractory support frame was obtained. It could be a better guidance for the size optimization of the refractory support frame.