关键词: 气流床, 生物质, 煤干粉, 共气化, 氧碳比, 冷煤气效率, 比氧耗, 比煤耗

Abstract:

To study the co-gasification characteristics of the biomass and coal mixture system, the co-gasification process model is built based on Aspen Plus. It is found that the process of biomass partly replace pulverized coal co-gasification does not affect the optimal operating conditions of gasifier, syngas yield and syngas calorific value, and has certain advantages in reducing the specific oxygen consumption; the quality of syngas is as same as the single pulverized coal gasification, and effective gas yield can reach 94%. In the co-gasification process of biomass replacing pulverized coal, the specific coal consumption and cold gas efficiency increase with the increasing of biomass content, and the cold gas efficiency can be increased to more than 80%. However, the addition of biomass will reduce the gasification temperature to a certain extent. In actual production, for the coal with high ash melting point, it is still necessary to add flux to reduce the ash melting point.

Key words: entrained flow reactor, biomass, dry pulverized coal, co-gasification, oxygen-to-carbon ratio, cold gas efficiency, specific oxygen consumption, specific coal consumption