Abstract: The process flow and regeneration mechanism of the solvent regeneration unit in a refinery are introduced.The existing problems during the operation of the unit are analyzed,such as the difficulty in controlling the temperature of the flash tank and the entrainment of impurities in the B series rich liquid.It is proposed to add a secondary heat exchanger for heat exchange between lean and rich liquid in order to increase the flashing temperature and its controllability,and further remove the dissolved hydrocarbons in the rich amine liquid.The entrained impurities in the rich amine solution sent from the hydrocracking unit can be eliminated by adding a filter to ensure the stable production of amine solution regeneration system.Aspen Plus software is utilized to build a model for the solvent regeneration unit.It is shown through a simulation analysis on flashing temperature that the flashing temperature of A and B rich amine liquids should be controlled at 60-65℃,which is beneficial to the removal of hydrocarbons in the rich amine liquid,and causes the flashing rate of hydrocarbons to exceed 70%.The pressure and reflux at the top of the A series and B series solvent regeneration towers are respectively optimized to further reduce steam energy consumption and provide a theoretical support for the high-quality operation of the unit.
李治明, 荣荣, 范成兵, 田旺博. 炼厂溶剂再生装置运行中存在的问题及思考[J]. 现代化工, 2022, 42(11): 230-235,239.
LI Zhi-ming, RONG Rong, FAN Cheng-bing, TIAN Wang-bo. Existing problems and considerations during operation of solvent regeneration unit in refinery. Modern Chemical Industry, 2022, 42(11): 230-235,239.
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