加氢装置高压换热器腐蚀问题分析及措施

针对加氢精制装置反应流出物高压换热器铵盐沉积和腐蚀问题，系统分析氯化物的来源及腐蚀原因，通过增加原料中间罐降低原料中水含量、提高系统压力、增加循环氢流量、提高反应流出物/混合进料换热器出口温度、增加反应流出物/低分油换热器前注水量、降低总注水量至设计范围内等一系列措施的实施，有效解决了该加氢装置反应流出物系统的铵盐沉积和腐蚀问题，同时单位能耗从596.87 MJ/t降到了451.44 MJ/t。

CORROSION IN HIGH PRESSURE HEAT EXCHANGERS OF HYDROGENATION UNIT AND COUNTERMEASURES

To solve the ammonium salt deposition and corrosion problems caused by Cl- in high pressure heat exchanger of hydrogenation unit, the source of chloride and the causes of corrosion were investigated. Based on the analysis, a series of measures was adopted: (i) adding intermediate feed tank to reduce water content in feed, (ii) increasing system pressure, (iii) increasing circulating hydrogen flow, (iv) raising the outlet temperature of heat exchanger E2101B, (v) increasing the water injection amount before heat exchanger E2101A/B, and (vi) reducing the total amount of injection water to the design range. After the complementation of the measures, the problems were effectively controlled, and the energy consumption of hydrogenation unit reduces from 596.87 MJ/t to 451.44 MJ/t.