System for selective catalytic reduction of nitrogen oxide in a gas stream of the combustion furnace having an initial concentration of nitrogen oxide, and a method for the selective conversion of nitrogen oxide in a gas stream of the combustion furnace having a The initial concentration of nitrogen oxide.

摘要

System and method for reducing catalu00ectica selective nitrogen oxide in a gas stream.It is a system and method for selective catalytic reduction of nitrogen oxide in an exhaust furnace which includes cool exhaust oven in a first section of the heat recovery(13 39 ) to a temperature between 204 198 C and 260 198 C,By introducing a reductant in the exhaust gas and reacting to the nitrogen oxide in the exhaust gas with the reducer in the presence of a SCR catalyst (19) in a reactor (10) placed in the chimney of F.Orno. The gas leaving the reactor treaty can be cooled in addition in a second section (15) of heat recovery.The system and process are particularly suitable for use in conjunction with furnaces for heat craqueio stock supply of hydrocarbon to produce olefin.The stock of supply is preferably preheated in the heat recovery sections before the introduction in the oven.