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AssigneeStamicarbon B.V.
InventorJohannes Henricus Mennen
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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.
A method for urea production in a urea production plant, comprising the steps of:
A urea production plant comprising a urea synthesis section, a concentrating section and a prilling tower,
A method for reducing ammonia emissions in a prilling tower of an existing urea production plant, wherein the existing plant comprises at least two existing concentrators and a prilling tower, said method comprising
Dependencies are inferred from the claim text.