Liu Zhen-Shu, Wey Ming-Yen, Lin Chiou-Liang
Department of Environmental Engineering, National Chung-Hsing University, ROC, Taichung, Taiwan.
J Hazard Mater. 2002 Dec 2;95(3):291-304. doi: 10.1016/s0304-3894(02)00142-5.
The objective of this research was to evaluate the reaction characteristics of CaOH2, HCl and SO2 in 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 (500-2000 ppm), SO2 concentration (500-2000 ppm), relative humidity (40-80% RH), and the addition of CaCl2 (30 wt.%). The results indicated that an HCl concentration of 500-2000 ppm did not affect HCl removal efficiency in the spray dryer at 150 degrees C and 45+/-5% RH. On the other hand, increase in SO2 concentration from 500 to 2000 ppm enhanced SO2 removal at 150 degrees C and 75+/-5% RH. Moreover, increase in removal efficiency of SO2 was more obvious when the relative humidity was greater than 80%. When the flue gas contained both HCl and SO2 simultaneously, the removal efficiency of SO2 could increase from 56.7 to 90.33% at HCl concentration of 236 ppm. However, when the concentration of HCl exceeded 535 ppm, the removal efficiency of SO2 decreased with increasing concentration of HCl. The removal efficiency of SO2 could be increase to 97.7% with the addition of CaCl2.
本研究的目的是评估实验室焚烧炉排放烟气中CaOH2、HCl和SO2的反应特性。本研究还评估了残留在残渣（包括喷雾干燥灰和布袋除尘器灰）中的硫含量。实验参数包括HCl浓度（500 - 2000 ppm）、SO2浓度（500 - 2000 ppm）、相对湿度（40 - 80%RH）以及CaCl2的添加量（30 wt.%）。结果表明，在150℃和45±5%RH条件下，500 - 2000 ppm的HCl浓度对喷雾干燥器中HCl的去除效率没有影响。另一方面，在150℃和75±5%RH条件下，SO2浓度从500 ppm增加到2000 ppm可提高SO2的去除率。此外，当相对湿度大于80%时，SO2去除效率的提高更为明显。当烟气同时含有HCl和SO2时，在HCl浓度为236 ppm时，SO2的去除效率可从56.7%提高到90.33%。然而，当HCl浓度超过535 ppm时，SO2的去除效率随HCl浓度的增加而降低。添加CaCl2后，SO2的去除效率可提高到97.7%。
