炼油厂酸性水汽提装置换热器及汽提塔塔盘积垢的分析

Analysis of foulant of heat exchangers and stripper plates in refinery sour water stripping unit

对炼油厂酸性水汽提装置换热器和汽提塔塔盘积垢中有机物和无机物的含量进行分析，采用XRD，FTIR，XRF等手段对积垢进行表征。实验结果表明，换热器封头积垢中有机物含量（W）较高（42％-52％），管束内积垢中无机物含量达70％（W）以上，汽提塔塔盘积垢中无机物含量达80％（w）以上。表征结果显示，换热器封头积垢中有机物以烯烃聚合物为主，无机物以铁的硫化物为主，管束内积垢中有非烃化合物的缩聚反应产物，无机物以γ-勃姆石为主；汽提塔塔盘积垢中有机物以烯烃聚合物为主，无机物以铁的硫化物和T-勃姆石为主；酸性水中溶解油和乳化油所含烯烃和非烯烃化合物的缩聚反应产物是积垢中有机物的来源，硫化物来源于H2S的腐蚀，γ-勃姆石来源于催化裂化酸性水所携带的催化剂粉末。

Organic and inorganic compounds in foulants in heat exchangers and on stripper plates in the sour water stripping unit of a refinery were analyzed and the foulants were characterized by means of XRD, FTIR and XRF. The results showed that the organic content（w） in the foulants on the heat exchanger heads was in the range of 42%-52%, the inorganic content in the foulants in the heat exchanger tubes was more than 70%（w）, and the inorganic content in the foulants on the stripper plates was more than 80%（w）. It was indicated that, in the foulants on the heat exchanger heads, the organic compounds were mainly olefin polymers and the inorganic compounds were mainly iron sulfide; in the tubes, there were polycondensation products of non-hydrocarbon compounds and y-boehmite [A10（OH）]. In the foulants on the stripper plates, the organic compounds were mainly olefin polymers, and the inorganic compounds were mainly 7-boehmite and iron sulfide. The organic compounds（olefin polymers and polycondensation products of non-hydrocarbon compounds） in the foulants came from dissolved oil and emulsified oil in the sour water, the sulfides came from corrosion with H2S, and A10（OH） likely came from catalytic cracking catalyst oowder carried by the sour water.