关键词: 气化, 气流床气化炉, 渣层, 热应力, 参考温度

Abstract: Solid slag layer can protect membrane wall from syngas radiation and liquid slag erosion. The work presented here aims to provide an improvement of numerical modeling for thermal stress analysis of slag layer and accurately represent the change of thermal stress during the cooling process. In the former studies, the numerical modeling for thermal stress analysis of slag layer often assumes that the change of thermal stress of the computational domain was based on a constant reference temperature (ambient temperature 25℃ is in common use). However, a single reference temperature cannot present the initial temperature distribution of the computational domain with a stress balance state of the cooling process, and will acquire an incorrect thermal stress distribution. Therefore, an improvement has been proposed:cutting the whole computational domain into some subdivisions and applying a reference temperature distribution on the subdivisions, in order to acquire a stress balance state at the beginning of the cooling process. 3D numerical model of previous literature was recalculated to test the validity of the improvement. Result showed a similarly trend with reference article on a membrane wall entrained-flow gasifier.

Key words: gasification, entrained-flow gasifier, slag layer, thermal stress, reference temperature