焦油裂解反应对循环灰催化作用的影响

以循环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，循环灰对降低焦油产率、提高煤气产率是有利的。以焦油的两种主要组份苯和甲苯为对象，用固定床反应器实验研究了焦油裂解过程中反应对一种烟煤形成的循环灰的催化活性的影响，测定了该种循环灰的失活系数，探讨了失活机理。实验结果表明，随着积碳量的增加，循环灰的比表面积和空隙率减小，裂解反应速率下降，裂解产物中碳产率增加。

Effect of cracking reactions of tar components on activity of CFBB circulating ash

Circulating ash is the heat carrier from the combustor to the gasifier to pyrolyze the coal, and the char is the fuel of the boiler. With the object of benzene and toluene, the effect of cracking reactions of the two main components of tar on the activity of circulating ash of Circulating Fluidized Bed Boiler from a kind of bituminous in a fixed bed reactor is investigated. The deactivation parameters were measured and the deactivation mechanism was also discussed. The experimental results show that the specific surface and void of circulating ash particle decrease with increase in coke content in ash, at the same time the tar cracks slowly, which makes the yield of coke increase.