The Effect of Rice Straw Gasification Temperature on the Release and Occurrence Modes of Na and K in a Fluidized Bed
The Effect of Rice Straw Gasification Temperature on the Release and Occurrence Modes of Na and K in a Fluidized Bed
复制标题
稻草气化温度对流化床Na、K释放及赋存模式的影响
DOI：
10.3390/app7121207
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发表时间：
2017-11
影响因子：
2.7
通讯作者：
Jin Baosheng
中科院分区：
文献类型：
--
作者：
Chen Tianyu;Cao Jun;Jin Baosheng
在600 ~ 800 °C的流化床反应器中进行了稻草气化实验，研究了稻草气化过程中碱金属的释放和赋存状态随温度的变化规律。采用电感耦合等离子体原子发射光谱法（ICP-AES）对不同温度下的原稻草和粉煤灰进行了分析。结果表明，稻草中Na、K含量的水溶态、乙酸铵溶态、盐酸溶态和铝硅酸盐结合溶态依次降低。水溶性钠盐和钾盐的含量占50%以上，而铝硅酸盐组合可溶态的含量最低，小于5%。Na的释放速率在50.2%~ 70.8%范围内随气化转化率的增加而增加，表现出一致的非线性特征，由此推断温度不是影响Na释放的唯一因素。在700 ℃时，K的释放可分为两个阶段。在第一阶段，钾的释放率几乎不变，为23.3%-26%。在第二阶段，释放率急剧增加：高达55.9%。粉煤灰中钠的浓度和水溶性、醋酸铵溶性和盐酸溶性形式所占的比例随温度的升高而降低。钾的释放可以解释如下：一条途径是有机形式的钾转化为气相;另一条途径是可溶性无机形式的钾，在高温下挥发。随着温度的升高，Na和K的铝硅酸盐结合溶解模式增加。
Rice straw gasification was carried out in a laboratory fluidized bed reactor system from 600 to 800 °C in order to well-understand the release and occurrence mode of alkali metals as a function of temperature during the gasification process. Inductively coupled plasma atomic emission spectrometry (ICP-AES) was applied to analyze the original rice straw and obtained fly ash at different temperatures. The results show that the Water-Soluble, Ammonium acetate-Soluble, Hydrochloric acid-Soluble, and Aluminosilicate Combination-Soluble modes of the Na and K contents in rice straw decreased in sequence. The content of Water-Soluble salts of Na and K accounts for more than 50%, while the content of the Aluminosilicate Combination-Soluble mode is the lowest: less than 5%. The release rate of Na appears to be consistent but nonlinear, increasing with gasification conversion ranges between 50.2% and 70.8%, from which we can deduce that temperature is not the only factor that impacts Na emission. The release of K can be divided into two stages at 700 °C. At the first stage, the release rate of K is almost invariable, ranging from 23.3% to 26%. At the second stage, the release rate increases sharply: up to 55.9%. The concentration and the proportion of the Water-Soluble, Ammonium acetate-Soluble, and Hydrochloric acid-Soluble modes of Na in fly ash decrease with a temperature increase. The release of K can be explained as follows: one path is an organic form of K converted into its gaseous phase; the other path is a soluble inorganic form of K that is volatile at a high temperature. With a temperature increase, the Aluminosilicate Combination-Soluble mode of both Na and K increases.
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影响因子：
5.3
作者：
Gilbe, Carl;Ohman, Marcus;Burvalll, Jan
通讯作者：
Burvalll, Jan
DOI：
--
发表时间：
2005
期刊：
--
影响因子：
--
作者：
Yung-Yun Chun
通讯作者：
Yung-Yun Chun
生物质热解及蒸汽气化过程中碱金属和碱土金属物质的释放特征
影响因子：
11.4
作者：
Jiang, Long;Hu, Song;Yao, Yao
通讯作者：
Yao, Yao
影响因子：
5.3
作者：
M. Öhman;L. Pommer;A. Nordin
通讯作者：
M. Öhman;L. Pommer;A. Nordin
影响因子：
5.3
作者：
John G. Olsson;J. Pettersson;N. Padban;I. Bjerle
通讯作者：
John G. Olsson;J. Pettersson;N. Padban;I. Bjerle