几种天然矿物脱除高温气体中碱蒸气研究

REMOVING ALKALI VAPOR AT HIGH TEMPERATURE BY NATURAL MINERALS

在实验室条件下用六种天然矿物对高温气体中碱蒸气的脱除进行了研究比较,结果得出高岭土具有最高的碱容量;实验表明吸附剂对碱蒸气的吸附不仅与吸附剂的化学成分有关,还与吸附剂的孔结构有关;同时讨论了反应温度、气体流速以及反应时间对高岭土碱容量的影响,并研究了850℃,气体流速为11 0m h时高岭土与碱蒸气的反应动力学,得出反应同时受化学反应和产物层的扩散所控制。

Six nature minerals (Acidic argil, Alumina, Kaolinite, Extra grade kaolinite, Meerschaum and Diatomaceous earth) were selected to remove NaCl vapor at high temperature Main elements of these natural minerals are Si and Al Experiments were carried out in a selfmade equipment which mainly consists of NaCl vapor generating section, fixedbed reactor and gas absorption section Results showed that sodium content is dependent on chemical constituent and microporous structure of sorbent and sodium content (465%) of kaolinite is the highest in the condition of 850?℃, 110?m/h gas velocity and 5?h operating time Effects of temperature and gas velocity on sodium content of kaolinite were discussed Results showed that there is an optimal temperature around 875?℃ for kaolinite to remove NaCl vapor and sodium content increases when space velocity decreases In addition, adsorption process of NaCl vapor on kaolinite at 850?℃ and 110?m/h gas velocity was found to be influenced by both chemical reaction and diffusion of a sodium resultant layer from the kinetics