加氢裂化装置结垢分析与防治措施

某石化公司加氢裂化装置脱丁烷塔及热高分换热器发生结垢导致非计划停工。取垢样通过XRD、SEM-EDS、XRF、FT-IR分析发现,脱丁烷塔底处的泵、加热炉以及管线中垢样成分主要为Fe S;而热高分换热器壳程及副线中垢样成分以氯化铵为主,另含有少量Fe S及含Gr化合物。对此,建议炼厂升级装置材质,以减少装置腐蚀导致的Fe S结垢,严格控制Cl-含量,提高换热器注水频率或使用阻垢剂以防止换热器内NH4Cl结垢。

Analysis and Prevention of the Scaling in Hydrocracking Units

The scaling of debutanizer and exchanger in the hydrocracking unit in a refinery led to unplanned shutdown. The scale samples were analyzed by XRD, SEM-EDS, XRF, FT-IR etc. Main component in the scale samples from the furnace and the pipes is FeS, while the scale samples from the heat exchanger are mainly composed of NH4Cl,little FeS and Gr compounds. The refinery is suggested to upgrade the unit materials to reduce the probability of corrosion. Cl- should be controlled strictly and the water flooding frequency should be increased to protect the exchanger from NH4Cl scaling.