Emission control of sodium compounds and their formation mechanisms during coal combustion
Emission control of sodium compounds and their formation mechanisms during coal combustion
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DOI：
10.1016/j.proci.2006.07.170
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发表时间：
2007-01-01
影响因子：
3.4
通讯作者：
Naruse, Ichiro
中科院分区：
文献类型：
--
作者：
Takuwa, Tsuyoshi;Naruse, Ichiro
为了控制燃煤过程中钠化合物的排放，对燃煤过程中喷入吸附剂技术进行了试验研究。选择高岭土作为吸附剂，对煤中钠化合物的挥发进行吸附。在燃烧实验中，高岭土与煤物理混合。燃烧两种具有相似煤性质的煤。在电热落管式炉上进行了燃烧试验，研究了高岭土添加量对钠化合物捕集特性的影响。为了阐明氢-空气燃烧过程中钠化合物转化行为的基本原理，还进行了与钠化合物相关的基元反应的化学动力学模拟，改变反应气氛。因此，高岭土即使在煤燃烧期间也可以有效地捕获钠化合物的蒸气。捕集效率取决于煤的类型。用于煤的钠化合物产生许多尺寸小于1 μ m的细颗粒，倾向于被高岭土有效地捕获。根据钠物种的动力学模拟，反应气氛的不同会影响钠蒸气的出现物种。在燃烧区，由于还原性自由基物质的出现，钠化合物在任何反应气氛中变成金属钠蒸气。HCl气体对钠化合物的转化起着重要作用，而SO_2气体对钠化合物的转化起着重要作用。(C)2006年，在燃烧研究所。爱思唯尔公司出版All rights reserved.
In order to control emissions of sodium compounds during coal combustion, the sorbent injection technology is tested during coal combustion. Kaolin is selected as the sorbent to absorb vapors of sodium compounds evolved from the coals. In the combustion experiments, the kaolin is physically mixed with coal. Two types of coal, which have the similar coal properties, are burned. Combustion tests are conducted, using an electrically heated drop tube furnace, to Study effect of kaolin addition on the capture characteristics of sodium compounds. In order to elucidate fundamentals on transformation behaviors of sodium compounds during hydrogen-air combustion, chemical kinetic simulation by elementary reactions relating to sodium compounds is also performed, varying the reaction atmosphere. As a result, the kaolin can effectively capture the vapor of sodium compounds even during coal combustion. The capture efficiency depends on the coal type. The sodium compounds for the coals, which produce many fine particles with size of less than I pm, tend to be effectively captured by the kaolin. According to the kinetic simulation of sodium species, difference of the reaction atmosphere affects occurrence species of sodium vapor. In the combustion region, the sodium compounds become metallic sodium vapor in any reaction atmospheres due to occurrence of the reducing radical species. HCl gas rather than SO, gas plays an important role to transform gaseous sodium compounds. (C) 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved.