白云石煅烧/加压碳酸化循环捕获CO_2实验研究

Experimental study on CO_2 capture performance of dolomite during atmospheric calcination/pressurized carbonation looping

在双固定床反应器系统上采用提高碳酸化反应压力的方法来改善白云石的CO2循环捕获性能.对白云石在不同碳酸化反应压力、温度、碳酸化气氛与煅烧气氛中CO2浓度以及颗粒粒径等条件下的循环碳酸化特性进行测试,并与石灰石的循环特性进行比较.结果表明,提高碳酸化反应压力有利于提高白云石的循环碳酸化转化率.反应压力一定,白云石的碳酸化转化率随碳酸化温度的增加呈先增加后减小的趋势.在700～750℃和0.5 MPa条件下,白云石获得较高的碳酸化转化率.白云石的加压循环碳酸化反应对一定的粒径范围和煅烧气氛具有较好的适应性.白云石的加压循环碳酸化性能较石灰石优越.

The CO2 capture performance of dolomite is investigated under pressurized carbonation in the dual-fixed bed system.Effects of carbonation pressure,carbonation temperature,CO2 concentration in carbonation and calcination atmosphere,and particle size on cyclic carbonation properties of dolomites are studied.A comparison is made between dolomite and limestone in cyclic carbonation properties.The results show that pressure elevation enhances carbonation conversion of dolomites.At a certain pressure,the carbonation conversion increases and then decreases with the increase of carbonation temperature.The highest CO2 capture capacity is achieved at 700 to 750 oC and 0.5 MPa.The dolomite demonstrates an adaptation to particle sizes and calcination atmosphere under pressurized carbonation.The dolomite exhibits better CO2 capture performance than the limestone at the same condition.