EMISSION CONTROL IN RICH BURN NATURAL GAS ENGINES

• Main Authors: DEVARAKONDA, MARUTHI NARASINGA RAO, VON DER EHE, JAMES KRISTOPHER, MCDOWELL, ROBERT EARL, SPAULDING, DENNIS JOHN
• Format: Patent
• Language: English; French; German
• Published: 30.09.2015
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; TRANSPORTING; WEAPONS

A passive mid bed air injection apparatus 20 for an engine 10 includes a three way catalyst 50 positioned in an exhaust stream of the engine 10. The three way catalyst 50 reduces NO x , CO and HC from the exhaust stream. The three way catalyst 50 includes an ammonia slip catalyst 54 positioned in the exhaust stream of the engine 10. The ammonia slip catalyst 54 is positioned downstream from the three way catalyst 50 and oxidizes NH 3 and CO from the exhaust stream. The three way catalyst 50 includes an oxygen input disposed between the three way catalyst 50 and the ammonia slip catalyst 54 such that the oxygen input delivers air downstream from the three way catalyst 50 and upstream from the ammonia slip catalyst 54. The oxygen input receives the air from a charged side of a forced induction device 22 and delivers the air to the exhaust stream entering the ammonia slip catalyst 54. An associated method 200 is also provided.