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標題: 界面活性劑添加物應用於乾式洗滌塔串聯袋濾式集塵處理酸性氣體之研究
作者: 曾惠馨
關鍵字: incineration;焚化;dry scrubber;fabric filter;acid gas;additive;surfactant;乾式洗滌塔;袋濾式集塵器;酸性氣體;添加物;界面活性劑
出版社: 環境工程學系
本研究即針對乾式洗滌塔在除酸反應過程中,吸收劑轉換率達極大值時亦正是反應速率為零之成因,利用界面活性劑的添加以延長除酸反應的進行。添加界面活性劑的目的有二:(1)增加氫氧化鈣粉體於煙道氣中的分散性,使其不因煙道環境中的濕度而凝聚。(2)藉由異質物種吸附於氫氧化鈣表面之行為,改變除酸反應環境以延緩非均相平衡(heterogeneous equilibrium)之發生。

The serious environmental problems caused by SO2 and NOX emission from incineration processes into the atmosphere may become acidic gas' precursor, when they became sulfate and nitrate aerosol through chemical reaction or any kind of mechanism. In order to comply with severe environmental regulations, dry sorbent injection integrated with fabric filter as the air pollution control devices was applied in incineration process to eliminate acid gas in their flue gas. These technologies incorporate advantages both semi-dry and wet scrubber, but may result in huge solid waste generation.
Base on sulfation' reaction rate becomes zero at the maximum conversion, the primary objective at present work is to use additive to extend the sulfation of Ca(OH)2. A dry scrubber integrated with fabric filter was employed to study the effect of surfactants on the removal efficiency of acid gas in the flue gas when Ca(OH)2 as sorbent. The parameters evaluated include (1) the different surfactants (calcium lignosulfonate, sodium lignosulfonate, alkyl naphthalene sodium sulfonate and b-naphthalene sodium sulfonate condensates) and (2) the composition of acid gas (SO2, NOX, HCl).
The results showed that Ca(OH)2 adding surfactants(surface-active agent) could effectively decrease the emission of acid gas during incineration processes. Different additive had respective absorption efficiency on different acid gas. On the whole, sodium lignosulfonate and b-naphthalene sodium sulfonate condensates had better absorption efficiency on SO2 and NOX but not on HCl. Bedsides, when SO2 were coexisted with NOX and HCl, it will result in inhibition or embitterment efficiency.
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