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1. JP2017122391 - EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

Office
Japan
Application Number 2016000952
Application Date 06.01.2016
Publication Number 2017122391
Publication Date 13.07.2017
Grant Number 6685728
Grant Date 03.04.2020
Publication Kind B2
IPC
F01N 3/08
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
3Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
08for rendering innocuous
B01D 53/94
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
Applicants SOKEN INC
株式会社SOKEN
DENSO CORP
株式会社デンソー
Inventors HORIUCHI YASUHIRO
堀内 康弘
NONOYAMA YOSHIHARU
野々山 由晴
KUBOSHIMA TSUKASA
窪島 司
Agents 張川 隆司
山内 健吾
米田 恵太
Title
(EN) EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
(JA) 内燃機関の排気浄化装置
Abstract
(EN)

PROBLEM TO BE SOLVED: To inhibit exhaust gas from causing reducing agent spray injected from an addition valve to flow even when a flow rate of the exhaust gas is large in an exhaust emission control device for an internal combustion engine for selectively reducing NOx in exhaust gas for purification by using a reducing agent in an NOx catalyst.

SOLUTION: An SCR catalyst 7 for selectively reducing NOx for purification by using ammonia is provided in an exhaust passage 2 of an internal combustion engine. The exhaust passage 2 includes a bent portion 3 upstream of the SCR catalyst 7, and an addition valve 8 for adding urea water as a reducing agent is provided on a bent outer side of the bent portion 3. A distance between the addition valve 8 and the SCR catalyst 7 is for example, equal to or shorter than a diameter of the SCR catalyst 7. The urea water is pumped up from an urea water tank 17 by a pump 18, and then, is supplied to the addition valve 8 via piping 19. A control section 20 calculates a flow rate of exhaust gas for example, on the basis of engine speed, engine load and an EGR rate, and controls the pump 18 to increase the pressure of the urea water supplied to the addition valve 8 when the flow rate is large.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2017,JPO&INPIT

(JA)

【課題】NOx触媒において還元剤により排気ガス中のNOxを選択的に還元浄化する内燃機関の排気浄化装置において、排気ガスの流量が多い場合であっても、添加弁から噴射された還元剤噴霧が排気ガスに流されてしまうのを抑制する。
【解決手段】内燃機関の排気通路2には、アンモニアによりNOxを選択的に還元浄化するSCR触媒7が設けられる。排気通路2は、SCR触媒7の上流側に曲部3を有し、曲部3の曲げ外側には還元剤としての尿素水を添加する添加弁8が設けられる。添加弁8とSCR触媒7との距離は例えばSCR触媒7の直径以下である。ポンプ18によって尿素水タンク17から尿素水が汲み上げられ、その尿素水が配管19を介して添加弁8に供給される。制御部20は、例えばエンジン回転数、エンジン負荷及びEGR率から排気ガスの流量を求め、流量が多い場合には、添加弁8に供給する尿素水の圧力を高くするようポンプ18を制御する。
【選択図】図1