凹凸棒石改性钙基吸收剂循环碳酸化特性的试验分析

发布时间：2018-09-18 16:11

【摘要】：钙基吸收剂在较高的温度下可有效的循环捕集烟气中的较低浓度的CO_2,通过升温释放出高浓度的CO_2。但其弊端在于随着CO_2释放/吸附的不断进行,吸收剂的烧结现象严重,CO_2的吸收效率也显著的下降,若仅采用钙基材料作为CO_2捕集剂,需不断的投入新鲜的吸收剂,消耗量较大。本论文以水泥工业为背景,研究其烟气中CO_2的捕集,并采用一维结构的凹凸棒对吸收剂进行表面修饰处理,来缓解吸收剂的烧结现象,以提升CO_2的吸收效率。试验结果表明:凹凸棒石物理吸附CO_2的量对钙基吸收剂碳酸化率的提高有一定的贡献,但此贡献要小于吸收剂抗烧结性能的提高所带来的贡献;凹凸棒石对颗粒粒径较大的吸收剂的改性效果较好;不改变钙基吸收剂的粒径,当将提纯凹凸棒石的粒径减小时,其改性效果进一步提高。
[Abstract]:Calcium based absorbent can effectively recycle the lower concentration of CO_2, in flue gas at higher temperature and release high concentration of CO_2. through heating up. However, with the continuous release / adsorption of CO_2, the absorption efficiency of the absorbent decreases significantly. If only calcium based material is used as the CO_2 trapping agent, fresh absorbent should be continuously put in, and the consumption will be larger. Taking cement industry as the background, this paper studies the capture of CO_2 in the flue gas, and uses a one-dimensional attapulgite to modify the surface of the absorbent to alleviate the sintering phenomenon of the absorbent and to improve the absorption efficiency of CO_2. The experimental results show that the amount of CO_2 physically adsorbed by attapulgite contributes to the increase of carbonation rate of calcium based absorbent, but this contribution is smaller than that of the improvement of anti-sintering property of absorber. The modified effect of attapulgite on the sorbent with larger particle size is better, and the modification effect is further improved when the particle size of purified attapulgite is reduced when the particle size of calcium based absorbent is not changed.
【作者单位】：西安建筑科技大学材料与矿资学院;陕西循环经济工程技术院;中国科学院西安光学精密机械研究所;
【基金】：国家自然科学基金项目(51274159) 陕西省重大科技创新专项(2012zkc06-2)
【分类号】：X701

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