Fuel Reformer Feedback Control for NOx Emission Regulation
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Solution Overview
Problem
Existing fuel reformer control systems struggle to accurately regulate NOx emissions and engine performance under changing fuel qualities and conditions, leading to suboptimal combustion stability and slow response times, making them unsuitable for transient applications.
Innovation Solution
A feedback control system that uses sensors to measure engine operating parameters correlated with NOx emissions, allowing a controller to adjust the reformer's operation to match target emission levels by adjusting temperature, pressure, and flow rate, ensuring precise syngas generation and optimal engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If lean burn technology is used to reduce NOx emissions, then NOx emission is reduced, but combustion stability deteriorates due to increased COV of IMEP and misfire risk
Solution Approach 1:
The patent changes the chemical composition parameters of the fuel by introducing syngas (containing H2 and CO) into the combustion chamber. This modifies the air-fuel mixture composition to improve combustion stability while maintaining lean burn conditions for NOx reduction.
Solution Approach 2:
The patent creates a composite fuel mixture by combining original hydrocarbon fuel with syngas (H2 and CO). This composite mixture leverages the advantages of both components: the syngas provides improved combustion stability and the overall mixture maintains lean burn characteristics for NOx reduction.
2Reliability
If hydrocarbon fuel is enriched with hydrogen through reforming, then combustion stability is improved, but system complexity increases due to additional reformer equipment and control systems
Solution Approach 1:
The reformer system is designed to serve multiple functions: it reforms hydrocarbon fuel into syngas, regulates the syngas flow rate, and integrates with the existing engine control system. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The patent implements a feedback control system where the engine control unit monitors combustion conditions and adjusts the reformer operation accordingly. This feedback mechanism optimizes syngas production and injection timing, improving combustion stability while managing system complexity through intelligent control.
3Device complexity
If traditional independent control of reformer and engine is used, then device complexity is reduced, but adaptability to changing fuel qualities and operating conditions deteriorates
Solution Approach 1:
The patent merges the control functions of the reformer and the engine into an integrated control system. The engine control unit coordinates both systems, allowing them to respond synergistically to changing fuel qualities and operating conditions, thereby improving adaptability while managing overall system complexity.
4Ease of operation
If rigid control scheme with fixed syngas generation is used, then ease of operation is improved, but response time to changing conditions increases
Solution Approach 1:
The patent transitions from a rigid, fixed control scheme to a dynamic control system where the reformer operation is continuously adjusted based on real-time feedback from the engine control unit. This dynamic adaptation allows the system to respond quickly to changing fuel qualities and operating conditions while maintaining operational simplicity through automated control.
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 system enables precise control of NOx emissions and improved engine performance by dynamically adjusting syngas production based on real-time feedback, ensuring compliance with emission targets even under varying conditions, and enhancing combustion stability and efficiency.
Implementation Method 1
a reformer may be used to reform at least part of the fuel into a synthesis gas (syngas), mainly including H2 and carbon monoxide (CO)
Implementation Method 2
The syngas is then mixed with the air and unreformed fuel to form a H2-rich mixture
Implementation Method 3
Internal combustion engines may be configured to combust hydrocarbon fuel to produce power
Data Source
AI summary
A system for reforming a fuel may include a first sensor configured to measure an operating parameter of an engine. The operating parameter may correlate to a NOx emission level of the engine. The system may also include a controller in communication with the sensor and a reformer. The controller may be configured to determine a target NOx emission level for the engine. The controller may be also configured to determine a target value of the operating parameter corresponding to the target NOx emission level. The controller may be further configured to control the reformer to reform at least a portion of the fuel based on a difference between the measured value and the target value of the operating parameter.