SYSTEM FOR REDUCING QUANTITY OF NOX IN VEHICLE EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To provide a system for reducing a quantity of NOx in vehicle exhaust gas.SOLUTION: A system for reducing a quantity of NOx in vehicle exhaust gas comprises: a storage space (1) storing a reducing agent; an SCR (Selective Catalytic Reduction) catalyst converter; an injection module (6c) to inject the reducing agent into exhaust gas at an upstream side of the SCR catalyst converter; at least one heat exchanger (2) which is connected to the storage space (1) and includes a porous matrix to absorb the reducing agent supplied from the storage space (1); an injector (11); and a valve (12). The heat exchanger is designed to transfer heat energy to the exhaust gas at the upstream side of the SCR catalyst converter during a vehicle start-up. The valve or the injector is designed to control a flow rate of the reducing agent sent to the heat exchanger (2) during the vehicle start-up so that a temperature of the exhaust gas is increased by absorption of the reducing agent with the porous matrix in the heat exchanger. The valve or the injector is closed when the temperature of the exhaust gas reaches a predetermined temperature.SELECTED DRAWING: Figure 4