Clean Emissions Module - Diesel Oxidation Catalyst (DOC) and Selective Catalytic Reduction (SCR) System
为满足目前的排放法规要求，将不允许通过发动机排出的少量特定化合物进入大气中。
Show/hide table
| |
| 图 1 | g03690232 |
|
典型示例 (1) 排气出口连接 (2) 柴油氧化催化器 (DOC) (3) 选择性催化还原（SCR）系统 (4) 柴油机排气处理液（DEF）喷油器 (5) 排气进口连接 | |
发动机清洁排放模块 (CEM) 包括下述部件。
- 柴油氧化催化器 (DOC)
- 选择性催化还原（SCR）系统
柴油氧化催化器（DOC）将废气中未充分燃烧的一氧化碳和烃氧化成二氧化碳和水。 DOC 还作用在氮氧化物上，以增大二氧化氮份额从而提高 SCR 系统效率。 DOC 是一个在所有正常发动机操作条件下都可持续操作的通流式装置。
柔性排气管连接发动机与清洁排放模块 (CEM)。 有关安装柔性排气管的正确步骤，请参阅拆解和装配。
DOC 之后，废气通过柴油机排气处理液（DEF）喷油器随柴油机排气处理液（DEF）喷射。 废气和 DEF 在混合室内混合。 混合物分解以形成氨气和二氧化碳。 混合物流入主选择性催化还原（SCR）反应室。
废气和雾化氨气及二氧化碳进入 SCR 反应室。 混合物与室内的 SCR 催化剂进行化学反应产生氮气和水蒸气。
SCR 催化剂之后有氧化催化剂。 氧化催化剂与过量氨气反应产生氮氧化物和水蒸气。
有关 DEF 系统的更多信息，请参考系统操作、测试和调整 , "DEF 喷射控制系统"。
Caterpillar Information System:
2014/12/12 New Fuel Injector Rocker Arms Are Used on Certain C13 Commercial Engines {1123}
C4.4 Engines for Caterpillar Built Machines DEF Dosing Control System
Retrofit SCR Aftertreatment Maintenance Interval Schedule
2014/07/03 New Accessory Drives Are Used on Certain 3500 Machine Engines {1207}
797 Off-Highway Truck Hydraulic System Hoist System - Oil Makeup - If Equipped
421-1011 Valve Recession Tool Group used on G3500 C, E, ; H Engines{0374, 0599, 0701, 0703, 1100} 421-1011 Valve Recession Tool Group used on G3500 C, E, & H Engines{0374, 0599, 0701, 0703, 1100}
797 Off-Highway Truck Manual Lowering (Powered Stairway) - Test - If Equipped
2014/06/13 Additional Diesel Particulate Filter (DPF) Ash Service Cleaning Interval Information Is Now Used On Certain Tier 4 Interim and Tier 4 Final C7.1 - C18 Engines {108F}
2014/06/13 New Engine Software Is Used on Certain C175 Electric Power Generation (EPG) Engines {1901, 1920}
C8.7 Marine Engine Belt - Inspect
C175-16 PETROLEUM ENGINES Fuel Pump (High Pressure) - Remove and Install
XQC1200 and XQC1600 Power Modules Water Temperature Regulators - Remove and Install - Auxiliary Water System
C4.4 Engines for Caterpillar Built Machines Clean Emissions Module - Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) System
C4.4 Engines for Caterpillar Built Machines Electronic Control System
C4.4 Engines for Caterpillar Built Machines Power Sources
3516B Generator Sets with Dynamic Gas Blending Component Location
C9 Generator Set Model View Illustrations
Bench Test Procedure for Hydraulic Piston Pumps {5070} Bench Test Procedure for Hydraulic Piston Pumps {5070}
C7.1 Commercial Marine Engine Welding Precaution
2014/06/20 New Software Is Used on Certain G3516B 1500 RPM Generator Set Engines {1901, 1920}
C7.1 Generator Sets Model View Illustrations
C7.1 Generator Sets Product Description
C7.1 Generator Sets Refill Capacities
C7.1 Generator Sets Voltage Regulators