Patent ID: 9638137
Date: 2017-05-02
CPC Classifications: F01N,F02B,F02M,Y02T

Claim:
1. A method for desulphurizing an exhaust-gas recirculation flow of an internal combustion engine supercharged by an exhaust-gas turbocharger, said exhaust-gas recirculation flow being supplied to a fresh-air side of the internal combustion engine, and ammonia being used for the desulphurization, the method comprising the steps of: branching off a first partial exhaust-gas flow from the exhaust-gas flow of the internal combustion engine so that the first partial exhaust gas flow flows through a first branch line connected to an exhaust gas line of the internal combustion engine upstream of a turbine of the exhaust-gas turbocharger; supplying to the first partial exhaust-gas flow in the first branch line at least one reactant that splits to form ammonia to form a laden exhaust-gas flow in the first branch line; branching the laden exhaust-gas flow into an exhaust-gas recirculation flow in the first branch line and an aftertreatment partial flow in a second branch line connected to the first branch line; supplying the exhaust-gas recirculation flow to the fresh-air side of the internal combustion engine through the first branch line, the first branch line being connected directly to the fresh-air side; supplying the aftertreatment partial flow to an exhaust-gas aftertreatment system via the second branch line, the aftertreatment partial flow bypassing the turbine of the exhaust-gas turbocharger; and controlling, by a regulator, at least one throttle device to control flow rates of the exhaust-gas recirculation flow and the aftertreatment partial flow as a function of at least one operating parameter defining a respective operating state of the internal combustion engine.