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催化裂化原料中有氯和氮存在,在高温条件下HCl气体不断逸出,同时催化裂化原料中的氮化物在催化裂化反应条件下,在催化裂化分馏塔内形成NH4Cl。分馏塔内随着油气不断上升,而分馏温度下降,NH4Cl结晶的速度越快,同时在设备表面的NH4Cl晶体也聚积越多,最终导致降液管流通面积减小,直至堵塞降液管,造成塔盘液层增厚,导致分馏效果变得很差,造成产品质量不合格。根据NH4Cl易溶于热水的原理,采用在线水洗的方法,去除结盐,恢复生产,降低成本,提升经济效益。
The presence of chlorine and nitrogen in the raw material of catalytic cracking leads to the gradual escape of HCl gas under high temperature conditions, while the formation of NH4Cl in the catalytic cracking fractionation tower under the conditions of catalytic cracking reaction. Fractionation tower as the oil and gas rising, while the fractionation temperature drop, NH4Cl crystallization faster, while the equipment surface NH4Cl crystals also accumulate, eventually leading to downcomer flow area decreases until the downcomer, resulting in The thickening of the tray liquid layer, resulting in poor distillation results, resulting in product quality unqualified. According to NH4Cl soluble in hot water principle, the use of online washing method, remove salt, restore production, reduce costs, improve economic efficiency.