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Urea production process characterized by short urea melt transportation time between last concentrator and prilling tower
Urea production process characterized by short urea melt transportation time between last concentrator and prilling tower
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机译:尿素生产过程的特点是尿素熔体在最后一个浓缩器和造粒塔之间的运输时间短
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摘要
The invention relates to a method for urea production and to a urea production plant wherein ammonia emission in the final step of forming urea prills is reduced. In the method, the concentration of a urea solution is performed in at least three consecutive concentration steps and the residence time of urea melt leaving a last concentrator to the prilling tower is minimized. This can be achieved by placing the last concentrator in adjacency with a urea melt inlet of the prilling tower, such as above the prilling tower. In this way, the ammonia emission in the prilling tower can be reduced by as much as 50% compared to the conventional urea production plants. The invention further relates to a method for reducing ammonia emission in the prilling tower of an existing urea production plant.
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