Patent ID: 9616383
Date: 2017-04-11
CPC Classifications: B01D,F01N,Y02T

Claim:
1. A Selective Catalytic Reduction (SCR) system comprising an SCR reactor, an inlet flow system, and a vaporizer module, wherein a. the SCR reactor comprises at least one SCR catalyst and is in communication with the inlet flow system and the vaporizer module, b. the inlet flow system comprises one or more entrances for exhaust gases from an engine, wherein the entrance is configured to distribute the flow of gases through at least one flow duct located around the SCR reactor, wherein the flow of exhaust gases through the flow ducts around the SCR provides heat to the vaporizer module in which urea, or an ammonia precursor, is introduced into the vaporizer module to be converted to ammonia prior to being introduced into the SCR reactor, and the flow of gases in each of the flow ducts is introduced into the SCR reactor after the introduction of an ammonia-laden gas stream and after passing through a plurality of baffle plates to provide an approximately uniform gas velocity and concentration profile across the cross section of the SCR reactor, and c. a vaporizer module comprising a means for introducing urea, or an ammonia precursor, into a heated pre-reactor in which it is at least partially decomposed and subsequently fed into an exhaust gas stream prior to introducing the exhaust gas stream to the SCR reactor.