Exhaust Reductant Injection Control for Emission Reduction
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Solution Overview
Problem
Large-scale combustion engines produce excessive emissions, leading to high costs for exhaust after-treatment systems due to their increased scale, necessitating a more conventional yet effective solution for emission reduction.
Innovation Solution
An exhaust treatment system with multiple exhaust treatment devices, injectors for dosing exhaust treatment fluids, and a controller that adjusts fluid dosing based on exhaust flow rate and temperature, allowing for proactive and real-time control of emissions treatment across multiple exhaust lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the scale of the after-treatment system is increased to reduce harmful emissions from large-scale engine applications, then the emission reduction effectiveness is improved, but the cost to produce, install, and service the system increases greatly
Solution Approach 1:
The exhaust system is divided into multiple separate exhaust lines (first exhaust line, second exhaust line, etc.), each with its own exhaust treatment device and injector. This segmentation allows the system to handle large-scale emissions from big engines by distributing the treatment across multiple smaller, more cost-effective units rather than requiring one massive treatment system.
Solution Approach 2:
The controller dynamically adjusts the dosing amount of exhaust treatment fluid for each injector based on real-time exhaust flow rate and temperature conditions. This dynamic control optimizes emission reduction effectiveness while minimizing the use of treatment fluids and reducing operational costs.
2Object-affected harmful factors
If multiple exhaust treatment devices and injectors are used to reduce emissions from large engines, then emission reduction effectiveness is improved, but the complexity of the system increases
Solution Approach 1:
The controller serves multiple functions by managing dosing amounts for multiple injectors across different exhaust lines, while each injector and treatment device is designed to be relatively simple and interchangeable. This universal control approach manages complexity centrally while keeping individual components simple and cost-effective.
3Object-affected harmful factors
If the dosing amount of exhaust treatment fluid is increased to ensure adequate emission treatment, then emission reduction effectiveness is improved, but the cost of treatment fluid consumption increases
Solution Approach 1:
The controller uses feedback from exhaust flow rate sensors and temperature sensors to continuously adjust the dosing amount of exhaust treatment fluid. This feedback mechanism ensures that enough treatment fluid is dosed to achieve effective emission reduction while avoiding excessive consumption by adapting to actual operating conditions in real-time.
Solution Approach 2:
The system changes dosing parameters (amount of treatment fluid) based on varying exhaust conditions (flow rate and temperature). By adjusting these parameters dynamically rather than using a fixed dosing rate, the system achieves effective emission treatment while optimizing treatment fluid consumption costs.
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
This approach reduces emissions efficiently while minimizing costs by optimizing the use of treatment fluids and components, achieving equal mass flow through each exhaust line and reducing the need for large, expensive components.
Implementation Method 1
The controller actively controls an amount of exhaust treatment fluid dosed into the exhaust stream by each of the plurality of injectors based on at least one of an exhaust flow rate and a temperature of the exhaust stream
Data Source
AI summary
An exhaust system including a plurality of exhaust treatment devices, plurality of injectors for dosing an exhaust treatment fluid into an exhaust stream, and a controller for controlling each of the plurality of injectors. The controller actively controls an amount of exhaust treatment fluid dosed into the exhaust stream by each of the plurality of injectors based on at least one of an exhaust flow rate and a temperature of the exhaust stream.