摘要
汽柴油加氢装置反应流出物系统存在高温硫化氢腐蚀、高温氢腐蚀、氯化铵腐蚀、湿硫化氢腐蚀和连多硫酸应力腐蚀开裂等多种腐蚀类型,它们之间相互影响相互作用。针对汽柴油加氢装置的反应流出物冷凝冷却系统,从工艺出发,结合内部介质的性质,以及通常采用的材料,分析了具体部位可能发生的腐蚀:高温部位主要是高温硫化氢腐蚀,但是一旦发生氯化铵沉积将导致换热管堵塞,采取冲洗措施时,引入液态水,水中氯离子含量很高,可引起奥氏体不锈钢的氯离子应力腐蚀;低温部位主要是湿硫化氢腐蚀,但是总注水量一旦超过设计值,高压分离器和低压分离器分离水分的效果变差,低分油含水量升高,可引发反应流出物/低分油换热器低分油侧腐蚀。因此对汽柴油加氢装置反应流出物系统的腐蚀进行防护时,应根据实际工艺条件系统分析可能发生的腐蚀,统一考虑防护措施,避免因控制一种腐蚀而引发其它腐蚀。
The high - temperature Hz S corrosion, high - temperature hydrogen corrosion, ammonia chloride corrosion, wet H2 S corrosion, polythionic acid corrosion, etc exist in gasoline and diesel hydrotreating units; and they have inter- reactions to each other. The possible corrosions in different locations in reactor effluent condensing and cooling systems of gasoline and diesel hydrotreating unit are analyzed in consideration of process, media properties and materials used. In high - temperature section, the main corrosion is the high -temperature H2S corrosion. When ammonia chloride is deposited, the heat exchanger tube will be plugged. If water washing is applied, the higher chlorine ions in the liquid water will cause the chlorine ion stress corrosion of austenitic steel. In low -temperature section, the main corrosion is wet H2S corrosion. When the total water injection exceeds the design specification, the separation performance of HP and LP separators will deteriorate and water in oil from LP separator will increase, leading to corrosion in LP separation oil side of reactor effluent/LP separator oil heat exchanger. Care must be taken when selecting the right corrosion prevention measures for reactor effluent system of gasoline and diesel hydrotreating units based upon the possible corrosions in actual process conditions so as to avoid controlling one corrosion while another corrosion occurs.
出处
《石油化工腐蚀与防护》
CAS
2012年第1期20-22,共3页
Corrosion & Protection In Petrochemical Industry
关键词
汽柴油加氢
反应流出物
腐蚀
gasoline ＆ diesel hydrotreating, reactor effluent, corrosion
