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.

摘要：

基于实验室小型水冷壁气流床气化炉，研究了两种油渣浆气化后在炉内壁形成渣层的内部结构及组成。建立了气化炉水冷壁的三维传热和应力模型，对气化炉紧急停车时炉壁的热应力变化及其分布进行了模拟计算。计算结果表明：渣层中越靠近渣层表面，热应力的变化越大；靠近水冷管和渣钉处的渣层热应力变化相对较小；渣层表面温度变化相同时，孔隙率大的渣层产生的形变较大。