Integrated DOC-DPF-SCR Diesel Exhaust After-treatment System
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Solution Overview
Problem
Existing exhaust after-treatment systems for diesel engines fail to simultaneously eliminate hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter, and lack an integrated layout that enhances the effectiveness of these components.
Innovation Solution
An integrated exhaust gas after-treatment system combining a Diesel Oxidation Catalyst (DOC)-Diesel Particulate Filter (DPF) assembly with a Selective Catalytic Reduction (SCR) system, utilizing sensors and a reducing agent supply system to synergistically reduce pollutants, with the DOC oxidizing NO, CO, and hydrocarbons, the DPF trapping particulate matter, and the SCR converting NOx into N2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate exhaust after-treatment systems are used for different pollutants, then each pollutant can be treated by a specialized system, but the overall system complexity increases and multiple separate systems are required
Solution Approach 1:
The patent combines DOC, DPF, and SCR systems into a single integrated exhaust after-treatment system. The DOC oxidizes CO and hydrocarbons, the DPF traps particulate matter, and the SCR converts NOx to nitrogen and water vapor, all within one unified system architecture that treats multiple pollutants simultaneously without requiring separate independent systems
Solution Approach 2:
The integrated system performs multiple functions within a single configuration: oxidation of CO and hydrocarbons by DOC, filtration of particulate matter by DPF, and reduction of NOx by SCR. This multi-functional approach eliminates the need for separate specialized systems for each pollutant type
2Volume of moving object
If DOC and DPF are placed close together in an integrated assembly, then space is saved and system compactness is improved, but access for maintenance and regeneration becomes more difficult
Solution Approach 1:
The integrated assembly is designed as a replaceable module that can be segmented from the exhaust system. The entire DOC-DPF-SCR assembly can be removed and replaced as a unit, allowing maintenance without disassembling the complex internal components. This modular segmentation maintains compact installation while enabling easy system-level replacement and maintenance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter, meeting stringent emission norms and facilitating automatic particulate filter regeneration, enhancing engine performance and ease of access for maintenance.
Implementation Method 1
The Diesel Oxidation Catalyst oxidizes NO, CO and hydro-carbons present in the exhaust gases
Implementation Method 2
The Diesel Particulate Filter is disposed inside the canister near an operative bottom end thereof for trapping particulate matter present in the exhaust gases
Implementation Method 3
The SCR system uses reducing agents such as urea to yield NOx conversion performance. The NOx conversion performance converts the NOx into N2
Data Source
AI summary
An integrated exhaust gas after-treatment system for eliminating pollutants present in exhaust gases is disclosed. The integrated exhaust gas after-treatment system includes a Diesel Oxidation Catalyst (DOC)-Diesel Particulate Filter (DPF) assembly, a Selective Catalytic Reduction (SCR), a dosing module and a reducing agent supply system. The Diesel Oxidation Catalyst (DOC)-Diesel Particulate Filter (DPF) assembly is connected to an exhaust gas manifold of an engine and includes a canister for holding a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF). The Diesel Particulate Filter (DPF) is disposed downstream of the Diesel Oxidation Catalyst (DOC) and is spaced there-from. The Selective Catalytic Reduction (SCR) is disposed downstream of the Diesel Oxidation Catalyst (DOC)-Diesel Particulate Filter (DPF) assembly and facilitates elimination of NOx present in the exhaust gases by reduction of the NOx.