一种循环床循环灰条件下焦油组分的催化裂解

Catalytic cracking reactions of tar components over circulating ash of CFBB

以循环流化床锅炉循环灰为热载体、部分气化产生的半焦为锅炉燃料的煤的部分气化技术中，降低焦油产率、提高煤气产率是一个关键。在固定床反应器实验台上实验研究了一种循环流化床锅炉循环灰条件下焦油的两种主要组分苯和甲苯的催化裂解反应特性，测定了裂解反应动力学参数，探讨了循环灰的催化机理，实验结果表明，与石英砂条件下相比，循环灰极大地促进了焦油的裂解程度，气态裂解产物总量提高。

To decrease the yield of tar is one of the key for the partial coal gasification with the circulating fluidized bed technology which was suggested by Tsinghua University. In this process, the circulating ash was the heat carrier from the combustor to the gasifier to pyrolyze the coal, and the char was the fuel of the boiler. An experimentally investigation of the catalytic cracking reactions of the two main components of tar: benzene and tolucene over circulating ash of CFBB in a fixed bed reactor was introduced in this paper. The cracking reactions kinetic parameters were measured and the catalytic mechanism was also discussed. The experimental results prove that the circulating ash has catalytic effects on the cracking reactions of tar, it caused the total yield of gas cracking products increasing.