高氯原料对柴油加氢精制装置的影响及应对措施

Impact of high-chloride crude oil on diesel hydrotreating unit and countermeasures

柴油加氢装置加工高氯原料,造成高压换热器和高压空冷器氯化铵盐结晶,反应系统差压增大。在反应器出口利用0.4%碱水冲洗铵盐,使反应系统差压由2.45 MPa降至1.75 MPa,系统恢复正常。氯化铵盐结晶温度一般在150~200℃,随反应系统压力、循环氢流量、原料氯含量、原料氮含量的变化而变化。通过严格监控装置原料数据,前移注水位置,增大循环氢量,提高氢油比,提高热高压分离器入口温度,建立高压换热器差压和高压换热器换热效率监测数据,建立氯化铵盐结晶温度监控数据等措施,保证了装置长周期运行。

Ammonium chloride crystallizes in the high-pressure heat exchanger and the high-pressure air cooler and leads to increased differential pressure in the reactor system when the high-chloride feed is processed in the diesel hydrotreating unit. The differential pressure of reaction system is lowered from 2.45 MPa to 1.75 MPa by rinsing ammonium salts with 0.4% alkaline water at the outlet of reactor. The crystallization temperature of ammonium chloride is generally at 150 -200 ℃ , which will change with the content of chlorine and nitrogen in the diesel oil feed, with the change of reaction pressure, hydrogen reeirculating rate. The longcycle operation of the unit is ensured by strict monitoring the feedstock data, forward moving the water injection point, increasing the recycle hydrogen, increasing the hydrogen to oil ratio, increasing the inlet temperature of hot high-pressure separator, establishing the data base efficiency of hot high-pressure separator, establishing database chlorides. for the differential pressure and the heat transfer for the crystallization temperature of Ammonium