EXHAUST GAS TREATMENT

摘要

An IC engine is provided with a device for generating ammonia by hydrolysis of an aqueous solution of urea and feeding it into the exhaust gas of the engine. The device includes a reaction vessel (13) arranged to receive aqueous urea from a reservoir (19) and heat the aqueous urea by heat exchange with the exhaust gas. The reaction vessel (13) has a pressure relief valve (21) set to maintain a maximum pressure in the reaction vessel (13) and a discharge valve (22) arranged to release hydrolysis product from the reaction vessel (13) when the aqueous urea has been fully hydrolysed. Both valves (21, 22) communicate with a reservoir (23) for storing hydrolysis product. A dosing valve (25) is operable to dose a volume of hydrolysis product into the exhaust gas via a nozzle (26).