The PUREM Airless Urea Dosing System ADS for NO{sub}x Reduction of Diesel Engines

摘要

To fulfil the Emission limits Euro 4 and Euro 5 the commercial vehicle OEM's have committed to exhaust aftertreatment systems. Both strategies are pursued: engine internal PM reduction in combination with SCR or engine internal NO{sub}x reduction in combination with an oxidation catalyst and/or DPF. In the SCR technology NO{sub}x is reduced to nitrogen and water by adding AdBlue as a reducing agent. Usually, the AdBlue dosing systems work air-supported which means that an AdBlue/air mixture is injected into the exhaust gas stream. As a further step in the development of dosing systems PUREM Abgassysteme GmbH is developing the so called Airless Dosing System (ADS), a system working without air.