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青岛石化25×104t/a半再生催化重整装置加工直馏石脑油和加氢焦化石脑油的混合物料,原料中硫、氮含量最大设计值分别为300mg/kg和2mg/kg。但受原料品种变化的影响,其硫含量通常高于400mg/kg,最高时接近900mg/kg;氮含量通常高于3mg/kg,平均为5mg/kg,最高时接近30mg/kg,导致精制后的石脑油氮含量大幅上升。为维持水氯平衡,只能采取提高注氯量操作。过多的氯会与生成的氨结合成氯化铵,在低于337.8℃时生成氯化铵盐。当氯化铵盐进入稳定塔后,会加剧塔盘堵塞,造成装置操作紊乱,无法正常生产。提出以下应对措施:通过提高汽柴油加氢装置的脱氮能力,降低加氢焦化石脑油的氮含量,改善原料油品质;通过更换新型重整预加氢催化剂,提高预加氢的脱氮能力,改善精制油品质;通过对稳定塔进行在线注水洗塔,去除塔内铵盐,恢复稳定塔的正常操作。
Qingdao Petrochemical 25 × 104t / a semi-regenerative catalytic reforming unit processing straight-run naphtha and hydrogenated coker naphtha mixture, the maximum sulfur and nitrogen content of the raw material design values were 300mg / kg and 2mg / kg. However, the sulfur content is usually higher than 400mg / kg and the highest is nearly 900mg / kg, while the nitrogen content is usually higher than 3mg / kg, the average is 5mg / kg and the highest is nearly 30mg / kg, The naphtha nitrogen content increased significantly. In order to maintain the water chlorine balance, only take to improve the amount of chlorine injection operation. Too much chlorine will combine with the ammonia formed to form ammonium chloride, which will generate ammonium chloride below 337.8 ° C. When the ammonium chloride into the stability of the tower, will aggravate the tray blockage, resulting in device operation disorder, can not be normal production. The following countermeasures are put forward: improving the denitrification capability of gasoline-diesel hydrogenation unit, reducing the nitrogen content of hydrogenated coker naphtha and improving the quality of raw material oil; improving the quality of raw oil by replacing with new reforming pre-hydrogenation catalyst, Ability to improve the quality of refined oil; tower tower by online water injection to remove the tower ammonium salt, to restore the normal operation of the stability of the tower.