关键词: 渣油加氢, 高压换热器, 结垢, 硫化亚铁

Abstract: The high-pressure heat exchangers for feedstock-product of several residue hydrotreating units of SINOPEC are investigated from different aspects, including the operation situation of high-pressure heat exchangers, the influence of high-pressure heat exchanger scaling, the factors affecting high-pressure heat exchanger scaling, and the measures to alleviate high-pressure heat exchanger scaling. The investigation results show that: the high-pressure heat exchanger with tube side on feedstock side and shell side on product side is prone to reduce heat exchange efficiency, and scaling is the main reason; The scaling of high-pressure heat exchanger will seriously affect the normal operation of the unit; The main component of the scaling of high-pressure heat exchanger is ferrous sulfide, but the existence of ferrous sulfide is the necessary and insufficient condition for scaling; The injection of scale inhibitor or physical/chemical cleaning and other measures can not overcome the problem of high-pressure heat exchanger; The scaling problem of high pressure heat exchanger can be effectively avoided by designing the feedstock-product high-pressure heat exchanger with shell side and tube side on the feedstock side and increasing the logistics speed in the heat exchanger.

Key words: residue hydrotreating, high pressure heat exchanger, scaling, ferrous sulfide