SHROUDED/DOWNSTREAM-POINTING AMMONIA GAS INJECTOR

摘要

An ammonia (reductant) injector for delivering ammonia into an engine exhaust stream is disclosed. Generally, the injector includes a body having an inlet fluidly coupled to at least one channel within the body, a discharge port within the body and fluidly coupled to the at least one channel, an ammonia feed line connected to the inlet of the body, and a means for protecting the discharge port from potential blockage. The protection is preferably provided by a conically-shaped shroud attached to the body and covering, while spaced from, the discharge port to protect the port from exhaust solids which might block the port. The necessity of the shroud is due to the discharge port being positioned to disperse ammonia in a direction parallel and opposite to an exhaust stream flow. Alternatively, the port may direct ammonia discharge with or at an angle incident to the exhaust flow.