Abstract:

Inner structures and components of slag layers formed by gasification of two kinds of oil-slag slurry on the furnace wall were studied in a lab-scale water wall entrained-flow gasifier.A mathematic model of three-dimensional heat transfer and stress was built.Based on the model the change and the distribution of thermal stress for emergency shutdown were calculated.The results indicated that the closer the position to the slag’s surface, the larger the change of thermal stress in the slag layer.The thermal stress of the slag layer close to the water tube and the slag nail was comparatively small.At the same change of temperature, the strain in the slag layer with higher porosity was larger.