电石渣流态化捕集燃煤电站烟气中CO2特性

CO2 Capture Performance of Carbide Slag under Fluidization in Coal-Fired Power Plant

在鼓泡流化床反应器上研究了电石渣煅烧得到CaO(CaO-电石渣)流态化捕集CO2性能,利用离子反应模型分析循环反应过程中碳酸化动力学特性。结果表明:CaO-电石渣在流态化条件下具有优于由石灰石煅烧得到的CaO(CaO-石灰石)的CO2捕集性能;随循环次数增加,CaO-电石渣化学反应控制阶段化学反应速率常数k、最终碳酸化转化率Xu以及快速反应阶段持续时间t均减小,但衰减速率逐渐放缓。动力学分析结果表明,CaO-电石渣虽然碳酸化速率低于CaO-石灰石,但是化学反应控制阶段持续时间高于CaO-石灰石,5次循环后,CaO-电石渣Xu大于CaO-石灰石。CaO-电石渣流态化条件下循环碳酸化性能优于CaO-石灰石,是一种具有良好应用前景的钙循环法CO2吸收剂。

The CO2 capture performance of carbide slag under fluidization was studied in a bubbling fluidized bed and the carbonation kinetic characteristics was analyzed by an ion reactive adsorption model. The results show that carbide slag has more favorable CO2 capture capacity under fluidization compared with limestone. The rate constant of chemical reaction during the control stage,k, final carbonation conversion rate,Xu, and duration during the rapid reaction stage,t, decrease with cycle number, with a gradually decaying speed. The kinetics analysis shows that the carbonation rate of carbide slag is lower than that of limestone while the duration time of carbide slag in chemical reaction controlled stage is longer than limestone. The value of Xu of carbide slag is higher than that of limestone after 5 cycles. The CO2 capture capacity of carbide slag higher than limestone and can be used as CO2 capture sorbent in calcium looping with favorable CO2 adsorption capacity.