Removal of dust in urea finishing
AssigneeStamicarbon B.V.
InventorsCain Christopher Doherty, Aloysius Mechteldis Emmanuel Schoenmakers
Life of this patent
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Abstract
Disclosed is a method for the removal of urea dust from the off-gas of a finishing section of a urea production plant. the method comprises subjecting the off-gas to quenching with water so as to produce quenched off-gas. The quenched off-gas is subjected to humidification by mixing said quenched gas stream with a humidification fluid selected from (a) saturated steam and (b) superheated steam mixed with a second aqueous stream, so as to produce a humidified gas stream, subjecting said humidified gas stream to particle separation (i.e., dust removal) by means of a scrubbing liquid in which at least part of the particles in the gas stream are soluble.
Claims12
A urea plant comprising a synthesis and recovery section;
- said section being in fluid communication with an evaporation section, said evaporation section being in fluid communication with a finishing section, and said evaporation section having a gas flow line to a condensation section;
- wherein said finishing section has a gas flow line to a gas treatment section comprising, in downstream order, a quenching system provided with an inlet for a quenching liquid, a humidification system comprising an inlet for steam or for a mixture of steam and an aqueous stream, and a particle removal system comprising an inlet for a scrubbing liquid and an outlet for an aqueous stream with dissolved particles.
Dependencies are inferred from the claim text.