Stripper with bottom chamber
AssigneeYara International Asa
InventorsLino Giovanni Porro, Adrian Bynes
Life of this patent
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Abstract
A bottom chamber of a stripper (or bottom liquid holder) including a vortex breaker, a blocking plate and a guiding plate. A stripper, a urea HP stripper, a urea plant, a method for operating a stripper and a method for producing a solid, particulate urea-based composition.
Claims17
A stripper comprising a top chamber comprising a liquid inlet, and a gas outlet, an intermediate chamber comprising a plurality of tubes and a bottom chamber, wherein the bottom chamber comprises a container comprising a lower cylindrical section, an intermediate section and an upper cylindrical section, a plurality of openings located on a top wall of the upper cylindrical section, a liquid outlet located at a bottom of the lower cylindrical section of the container and concentric with the lower cylindrical section of the container;
- and the plurality of openings are configured to receive the plurality of tubes, wherein the plurality of tubes are configured for guiding a fluid comprising dissolved gases from the top chamber of the stripper to the bottom chamber;
- wherein the bottom chamber further comprises
- (i) a vortex breaker joined to the bottom of the lower cylindrical section of the container, the vortex breaker comprising a top circular plate parallel with the bottom of the lower cylindrical section and concentric with the liquid outlet, the top circular plate being fixed to the bottom of the lower cylindrical section via vertical plates arranged in a cross, wherein a diameter of the top circular plate is greater than a diameter of the liquid outlet to prevent fluid from falling directly from one or more of the plurality of openings directly into the liquid outlet;
- (ii) a blocking plate for preventing bubbles of gas entrained by fluid falling from the plurality of openings from reaching the liquid outlet, the blocking plate comprising a first cylindrical segment concentric with the liquid outlet and with a diameter greater than a diameter of the vortex breaker, and a height of the first cylindrical segment being greater than a height of the vortex breaker, said first cylindrical segment being joined to the bottom of the lower cylindrical section, and a second segment joined to a top of the first cylindrical segment and having a shape of a truncated cone pointing upwards, wherein a diameter of a bottom of the second segment is equal to a diameter of the first cylindrical segment, wherein the first cylindrical segment comprises one or more openings, thereby allowing fluid to flow from a wall of the lower cylindrical section to the liquid outlet;
- (iii) a guiding plate for guiding fluid falling from the walls of the intermediate section towards a side wall of the lower cylindrical section, the guiding plate being concentric with the liquid outlet, wherein a diameter of the guiding plate is equal to or greater than a diameter of the blocking plate, but smaller than a diameter of the lower cylindrical section of the container, wherein the guiding plate is located at a junction of the lower cylindrical section and the intermediate section, extending partially in the lower cylindrical section and partially in the intermediate section of the container.
Dependencies are inferred from the claim text.