Patent ID: 7371353
Filing Date: 2008-05-13
Classification: B01D,C01C,F01N,Y02T

Abstract:
1. An exhaust gas emission control system, comprising: a first cylinder group configured to produce a first exhaust gas stream which contains NOx; a first exhaust passage fluidly connected with the first cylinder group and configured to receive the first exhaust gas stream; a cooler disposed downstream of the first cylinder group and configured to cool the first exhaust gas stream to a predetermined temperature range; a first catalyst disposed downstream of the cooler and configured to convert at least a portion of the NOx in the exhaust gas stream into ammonia; a second cylinder group configured to produce a second exhaust gas stream; a second exhaust passage configured to receive the second exhaust gas stream; a merged exhaust passage in fluid communication with the first exhaust passage and second exhaust passage; and a second catalyst in fluid communication with the merged exhaust passage and configured to catalyze a reaction between NOx and ammonia.