摘要
钙基吸收剂是CO2捕集技术中常用的吸收剂,但随着循环次数的增加,天然钙基吸收剂循环反应特性下降明显.采用葡萄糖酸钙(Ca(C6H11O7)2)与葡萄糖酸镁(C12H22MgO14)及L-乳酸铝([CH3CH(OH)COO]3Al)作为前驱物,通过湿法混合的方法处理,制得了5种新型钙基吸收剂,试验研究了其吸收CO2的循环吸收能力及循环稳定性,分析了吸收剂组分、煅烧温度、煅烧气氛等条件对新型吸收剂循环反应特性的影响规律.研究结果表明,选用此前驱物制备的吸收剂,其循环反应特性明显高于传统的钙基吸收剂;其中,CaO/MgO(75wt%/25wt%)吸收剂具有最好的循环吸收能力,CaO/Ca9Al6O18(75wt%/wt25%)吸收剂具有最好的循环稳定性.通过研究煅烧条件对这两种吸收剂循环反应特性的影响,得到:850℃时,吸收剂表现出最佳的反应特性,而随着温度的升高,吸收剂的循环吸收能力有所下降;煅烧气氛对吸收剂循环吸收特性的影响与煅烧温度有显著的关系.
Calcium-based sorbents are widely used in CO2 capture technology. However, the natural ones suffer from a well-know problem of loss in capacity. Calcium D-gluconate monohydrate (Ca(C6H11O7)2), magnesium D-gluconate hydrate (C12H22MgO14) and Aluminum L-lactate hydrate ([CH3CH(OH)COO]3Al) were employed as precursors to produce five new sorbents with a simple wet mixing method. Cyclic absorption capacity and stability of five sorbents were studied experimentally. The effects of sorbent components, calcination temperatures, calcination atmospheres on cyclic reaction characteristic were analyzed. It was found that the capabilities of these sorbents were better than that of conventional Calcium-based sorbents. The CaO/MgO (75wt%/25wt%) exhibits the best cyclic absorption capacity while CaO/Ca9Al6O18 (75wt%/25wt%) shows the best cyclic stability. Subsequently, a further study was conducted to examine the effects of reaction conditions on cyclic reaction characteristics for the two sorbents. Experimental results indicated that the cyclic absorption capacity of the sorbents showed the best at 850°C, but decreased with increase of cyclic reaction numbers. The cyclic absorption characteristics of the sorbents are affected by calcination atmosphere and the effects vary with calcinations temperatures.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2012年第5期811-819,共9页
Journal of Basic Science and Engineering
基金
重庆市自然科学基金重点项目(CSTC
2009BA6067)
