Apparatus and method for waste gas scrubbing

A device for waste gas scrubbing in a urea plant, the device comprising:

• a duct with an inlet opening and an outlet opening, wherein the device is configured such that a waste gas passes along a transportation direction in the duct, wherein the duct extends horizontally at least in sections and/or the transportation direction of the waste gas through the duct extends horizontally in an installed state of the device, wherein the duct comprises:
• a first region comprising a first surface enlargement structure disposed in the duct for removing urea dust particles from the waste gas, and
• a second region comprising a second surface enlargement structure disposed in the duct for removing chemical compounds from the waste gas, which are configured to be integrated by an acid-base reaction into an aqueous liquid phase,
• wherein a cross-sectional area of the duct extending perpendicular to the transportation direction in the second region is greater than a cross-sectional area of the duct extending perpendicular to the transportation direction in the first region.

A method for waste gas scrubbing in a urea plant, the method comprising:

• guiding a waste gas through a duct having a first region for removing urea dust particles and a second region for removing chemical compounds from the waste gas, which are configured to be integrated by an acid-base reaction into an aqueous liquid phase;
• and
• transporting the waste gas through the second region at a lesser speed than in the first region due to an enlargement of a cross-sectional area of the duct that extends perpendicular to a transportation direction in the second region,
• wherein the duct extends horizontally at least in sections and/or the transportation direction of the waste gas through the duct extends horizontally.