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化工学报  2015 

钙基吸收剂硫氮协同脱除过程中表面产物层生长机制

DOI: 10.11949/j.issn.0438-1157.20141246, PP. 1867-1873

Keywords: 钙基吸收剂,同时脱硫脱硝,产物层生长,燃煤污染

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Abstract:

为了分析钙基吸收剂硫氮协同脱除过程中产物层的生长机制,采用氢氧化钙单晶体表面(0001)模拟吸收剂孔隙的孔壁及外表面,针对脱硫、脱硝及硫氮协同脱除过程中产物层的生长规律进行了分析,结合晶体生长理论及脱硫和脱硝过程中产物层生长的差异,提出了硫氮协同脱除过程中产物层生长的机制。研究结果表明,脱硫反应首先发生在单晶表面局部区域,并使该区域膨胀形成颗粒状凸起结构;之后,随着反应区域不断扩大,表面膨胀趋于一致,从而形成连续致密产物层。由于脱硝产物易溶于水,且在液膜中扩散,因此脱硝反应对单晶表面表现出刻蚀作用。硫氮协同脱除过程中,脱硝反应的刻蚀作用抑制了脱硫连续致密产物层的形成,同时,液膜中脱硝产物的出现也改变了脱硫产物的生长习性,因此反应后产物层为疏松结构。

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