Experimental evaluation of lime spray drying for SO2 absorption

IF 1.6 Q4 ENVIRONMENTAL SCIENCES AIMS Environmental Science Pub Date : 2023-01-01 DOI:10.3934/environsci.2023019
L. Koech, H. Rutto, T. Seodigeng
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Abstract

This paper presents the findings of an experimental investigation on the performance of a laboratory-scale spray dryer involving flue gas desulfurization. Using commercial hydrated lime as a sorbent, a systematic set of experiments were performed to evaluate SO2 absorption capacity of the spray dryer. The experimentation involved accurate measurement of the spray drying characteristics, such as temperature and SO2 concentration along the spray chamber, by varying the input and output variables. Tests were done to investigate the effects of spray characteristics, i.e., inlet gas phase temperature (120–180 ℃) and calcium-to-sulfur ratio (1–2.5), on SO2 removal efficiency. The performance of the spray dryer was further evaluated based on the degree of conversion of calcium (sorbent utilization) after SO2 absorption. Results indicated an increase in SO2 removal efficiency by increasing the stoichiometric ratio and decreasing the temperature. Absorption efficiency of SO2 beyond 90% was achieved at a stoichiometric ratio of 2.5. A high degree of conversion of calcium was realized at low stoichiometric ratios, with a maximum utilization of 94% obtained at a stoichiometric ratio of 1.5. The analysis of the final desulfurization product revealed the presence of sulfite with better conversion achieved at a stoichiometric molar ratio of 1.5. A significant amount of unreacted sorbent (63.43%) was observed at a stoichiometric ratio of 2, while samples collected at a stoichiometric ratio of 1.5 had the lowest concentration of unreacted Ca[OH]2 (41.23%).
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石灰喷雾干燥吸附SO2的实验评价
本文介绍了对实验室规模的烟气脱硫喷雾干燥机性能的实验研究结果。以工业水合石灰为吸附剂,对喷雾干燥机的SO2吸附性能进行了系统的试验研究。该实验通过改变输入和输出变量,精确测量喷雾干燥特性,如沿喷雾室的温度和SO2浓度。试验研究了喷雾特性,即进口气相温度(120 ~ 180℃)和钙硫比(1 ~ 2.5)对SO2去除效率的影响。通过对SO2吸附后钙的转化率(吸附剂利用率)进一步评价喷雾干燥器的性能。结果表明,增加化学计量比和降低温度可以提高SO2的去除率。在化学计量比为2.5的条件下,SO2的吸收效率达到90%以上。在较低的化学计量比下实现了钙的高度转化,在化学计量比为1.5时获得了94%的最大利用率。对脱硫产物的分析表明,在化学计量摩尔比为1.5时,脱硫产物中存在亚硫酸盐,转化率较好。当化学计量比为2时,未反应的吸附剂数量显著(63.43%),而当化学计量比为1.5时,未反应的Ca[OH]2浓度最低(41.23%)。
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来源期刊
AIMS Environmental Science
AIMS Environmental Science ENVIRONMENTAL SCIENCES-
CiteScore
2.90
自引率
0.00%
发文量
31
审稿时长
5 weeks
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