Reaction characteristics of Ca(OH)2, HCl and SO2 at low temperature in a spray dryer integrated with a fabric filter.
Reaction characteristics of Ca(OH)2, HCl and SO2 at low temperature in a spray dryer integrated with a fabric filter.
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DOI：
10.1016/s0304-3894(02)00142-5
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发表时间：
2002-12
影响因子：
13.6
通讯作者：
Zhen-Shu Liu;M. Wey;Chiou-Liang Lin
中科院分区：
文献类型：
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作者：
Zhen-Shu Liu;M. Wey;Chiou-Liang Lin
本研究的目的是评估实验室焚烧炉排放的烟气中 Ca(OH)2、HCl 和 SO2 的反应特性。本研究还评估了残留物（包括喷雾干燥机灰和布袋除尘器灰）中保留的硫含量。实验参数包括HCl浓度(500-2000ppm)、SO2浓度(500-2000ppm)、相对湿度(40-80%RH)以及CaCl2(30wt.%)的添加量。结果表明，在 150°C 和 45±5% RH 条件下，500–2000ppm 的 HCl 浓度不会影响喷雾干燥器的 HCl 去除效率。另一方面，在 150°C 和 75±5% RH 下，SO2 浓度从 500 增加到 2000ppm 增强了 SO2 的去除。而且，当相对湿度大于80%时，SO2去除效率的提高更为明显。当烟气中同时含有HCl和SO2时，HCl浓度为236ppm时，SO2的去除率由56.7%提高到90.33%。然而，当HCl浓度超过535ppm时，SO2的去除效率随着HCl浓度的增加而降低。添加CaCl2后SO2去除率可提高至97.7%。
The objective of this research was to evaluate the reaction characteristics of Ca(OH)2, HCl and SO2in the flue gas emitted by a laboratory incinerator. The amount of sulfur retained in the residues (including the spray dryer ash and baghouse ash) was also evaluated in this study. The experimental parameters included HCl concentration (500–2000ppm), SO2concentration (500–2000ppm), relative humidity (40–80% RH), and the addition of CaCl2(30wt.%). The results indicated that an HCl concentration of 500–2000ppm did not affect HCl removal efficiency in the spray dryer at 150°C and 45±5% RH. On the other hand, increase in SO2concentration from 500 to 2000ppm enhanced SO2removal at 150°C and 75±5% RH. Moreover, increase in removal efficiency of SO2was more obvious when the relative humidity was greater than 80%. When the flue gas contained both HCl and SO2simultaneously, the removal efficiency of SO2could increase from 56.7 to 90.33% at HCl concentration of 236ppm. However, when the concentration of HCl exceeded 535ppm, the removal efficiency of SO2decreased with increasing concentration of HCl. The removal efficiency of SO2could be increase to 97.7% with the addition of CaCl2.