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Method for avoiding the corrosion of the strippers in the urea manufacturing plants
Method for avoiding the corrosion of the strippers in the urea manufacturing plants
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机译:避免尿素生产厂中汽提塔腐蚀的方法
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摘要
A method for passivating the surface of the strippers of the urea plants, where the temperatures are very high, where the pressures range from 120 to 240 Kg/cm.sup.2 and where the effluent process flow from the synthesis reactor undergoes one or more falling-film evaporations, preferably in countercurrent with a driving gas consisting of NH.sub.3 or CO.sub.2, characterized by the fact that the passivation is carried out by means of a sinergistic combination of oxygen, preferably injected into the bottom of at least one stripper, and of a second passivating agent, preferably injected into the process flow entering the head of at least one stripper, wherein said second passivating agent is injected in the liquid state or as a liquid solution, before or contemporaneously to the start of the evaporation.
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机译:一种用于钝化尿素装置汽提塔表面的方法,该方法温度很高,压力范围为120至240 Kg / cm 2且合成反应器的流出工艺流经历一个或多个降膜蒸发,最好与由NH 3或CO 2组成的驱动气体逆流蒸发,其特征在于钝化是通过氧气的单质组合进行的,最好是注入底部至少一种汽提塔和第二钝化剂,优选注入进入至少一个汽提塔的塔顶的工艺流中,其中所述第二钝化剂在液态或液态之前或之后同时以液态或液态溶液注入。开始蒸发。
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