公开(公告)号：WO2014012096A1

公开(公告)日：2014-01-16

申请号：PCT/US2013/050504

申请日：2013-07-15

Applicant: CUMMINS IP, INC.

Inventor： ZENG, Fan ,  BRUNER, C., Larry ,  HODZEN, Edmund ,  PACKAGE, Ian ,  KUMAR, Shankar ,  KAMASAMUDRAM, Krishna

IPC: F01N3/10 ,  F01N9/00 ,  F01N11/00

CPC classification number: B01D53/9495 ,  B01D53/9404 ,  F01N3/2066 ,  F01N9/00 ,  F01N2560/021 ,  F01N2610/1493 ,  F01N2900/1616 ,  F01N2900/1806 ,  G01N33/0054 ,  Y02A50/246 ,  Y02T10/24 ,  Y02T10/47 ,  Y10T436/12

Abstract: A method and system for mitigating a urea deposit within an SCR system (150) that includes determining (406) a mass of an accumulated urea deposit present within SCR catalyst (152) and piping (34), comparing (408) the mass of the accumulated urea deposit with a deposit upper threshold limit, and initiating (410) an SCR regeneration event when the mass of the accumulated urea deposit is greater than the deposit upper threshold limit. The method further includes determining (412) an amount of NH3 passing through the SCR catalyst downstream of the urea deposit, comparing (414) the amount of NH 3 passing through the SCR catalyst with an NH 3 regeneration threshold limit, and terminating (422) the SCR regeneration event when the level of NH 3 passing through the SCR catalyst is less than the SCR NH 3 regeneration threshold.

Abstract translation: 一种用于减轻SCR系统（150）内的尿素沉积物的方法和系统，其包括确定（406）存在于SCR催化剂（152）和管道（34）内的累积尿素沉积物的质量（408） 累积的具有上限阈值的尿素沉积物，并且当累积的尿素沉积物的质量大于沉积物上限阈值时，启动（410）SCR再生事件。 该方法还包括确定（412）在尿素沉积物下游通过SCR催化剂的NH 3的量，比较（414）通过SCR催化剂的NH 3的量与NH 3再生阈值极限，并终止（422）SCR NH 3通过SCR催化剂的水平低于SCR NH3再生阈值时的再生事件。