Method and apparatus for treating diesel exhaust emissions

An apparatus for treating diesel exhaust emissions, the apparatus comprising:

• a) a launder reservoir containing aqueous ammonia solution;
• b) an intake manifold in fluid communication with a diesel engine exhaust outlet, wherein the intake manifold is provided with an inlet for ingress of an ammonia gas stream in an arrangement whereby, in use, the ammonia gas stream mixes with the diesel exhaust emissions to produce a gas mixture;
• c) a conditioning chamber in fluid communication with the intake manifold to receive the gas mixture therefrom, wherein the conditioning chamber is configured to pass the gas mixture to a first gas-liquid contact zone whereby the gas mixture is reacted with a first stream of aqueous ammonia delivered via a first conduit in fluid communication with the launder reservoir and a nozzle, thereby producing a gas-liquid mixture in the first gas-liquid contact zone;
• d) a static mixer in fluid communication with the first gas-liquid contact zone, and interposed between the first gas-liquid contact zone and a second gas-liquid contact zone;
• e) the second gas-liquid contact zone being provided with a spray head configured to spray a second stream of aqueous ammonia solution therein, wherein said second stream is delivered to the spray head via a second conduit arranged in fluid communication with the launder reservoir, whereby in use, the gas-liquid mixture in the second gas-liquid contact zone separates by gravity, with liquid collecting in the launder reservoir and carbon dioxide-depleted gas mixture being vented therefrom.