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US 10,207,216 B2Granted
Removal of dust in urea finishing
AssigneeStamicarbon B.V.
InventorsPetrus Catharina Gerlach Soons, Wilfried Marc Renaat Dirkx
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Abstract
Disclosed is a method for the removal of urea dust from the off-gas of a finishing section (1) of a urea production plant, the method comprises subjecting the off-gas to quenching with water (06) so as to produce quenched off-gas, and subjecting the quenched off-gas to scrubbing using at least one venturi scrubber (11). As a result, a lower pressure drop over the scrubber is attained, and a more efficient growth of urea particles, facilitating the removal thereof.
Claims12
A method for removing urea dust from an off-gas of a finishing section of a urea production plant, the method comprising:
- (a) subjecting the off-gas to quenching with water optionally in the form of an aqueous solution so as to produce quenched off-gas, and
- (b) subjecting the quenched off-gas to scrubbing using at least one venturi scrubber to give scrubbed gas,
- (i) wherein said venturi scrubber comprises a throat, a converging section, and an entrance to said converging section, and
- (ii) wherein the quenching takes place before the off-gas enters the venturi scrubber, and
- (c) adding a scrubbing liquid to the venturi scrubber at said throat or at said entrance such that said added scrubbing liquid enters the quenched off-gas;
- wherein the method comprises, between steps (a) and (b), passing the quenched off-gas through a washing stage, and introducing washing liquid into said washing stage, wherein the washing liquid percolates down through said washing stage, thereby collecting particles from said quenched off-gas stream.
3 more elements
Dependencies are inferred from the claim text.