Closed-Loop Combustion Apparatus Control with Oxygen Feedback
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Solution Overview
Problem
Existing combustion apparatus control systems face inefficiencies in adjusting fuel-to-air ratios, leading to suboptimal performance and potential harmful emissions, particularly when dealing with varying fuel compositions and environmental conditions.
Innovation Solution
A closed-loop and open-loop control system that utilizes oxygen concentration sensors and actuator characteristic curves to autonomously adjust fuel and air supply, independent of traditional feedback mechanisms, ensuring optimal combustion performance and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional feedback sensors (λ-sensors, O2 probes) are used to adjust air ratio, then air ratio can be kept constant, but burner performance changes with fuel composition and manual re-adjustment is required
Solution Approach 1:
The patent implements feedback control by continuously monitoring oxygen concentration in exhaust gases and automatically adjusting the air actuator position and fuel supply accordingly. The control unit compares measured oxygen values with target values and dynamically adjusts actuators to maintain optimal combustion, eliminating manual re-adjustment when fuel composition changes.
Solution Approach 2:
The system changes operational parameters (air actuator position, fuel supply rate) based on measured oxygen concentration to maintain optimal combustion. By dynamically adjusting these parameters according to real-time feedback, the system adapts to varying fuel compositions without manual intervention.
2Extent of automation
If characteristic curves are predefined in the laboratory, then automation is achieved, but adaptability to different fuels and environmental conditions is limited
Solution Approach 1:
The patent transitions from static predefined characteristic curves to dynamic real-time control. The system continuously measures oxygen concentration and adjusts air-fuel ratios dynamically based on actual combustion conditions, enabling adaptation to different fuels and environmental variations while maintaining full automation.
Solution Approach 2:
The control system performs self-adjustment by automatically modifying combustion parameters based on oxygen sensor feedback. The system serves itself by detecting deviations from optimal combustion and autonomously correcting air-fuel ratios without external intervention, enhancing both automation and adaptability.
3Productivity
If air supply is adjusted to keep air ratio constant, then combustion efficiency improves, but burner performance changes with fuel composition
Solution Approach 1:
The system uses oxygen concentration feedback to simultaneously optimize both combustion efficiency and performance consistency. By continuously monitoring exhaust oxygen and adjusting air supply and fuel delivery together, the system maintains optimal combustion efficiency while compensating for fuel composition variations to ensure consistent burner performance.
Solution Approach 2:
The control unit changes multiple parameters simultaneously (air actuator position and fuel supply rate) based on oxygen feedback. This coordinated parameter adjustment maintains optimal air-fuel ratios for high combustion efficiency while adapting to different fuel compositions to ensure consistent burner performance output.
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 enables efficient and safe combustion by optimizing fuel-to-air ratios, minimizing harmful emissions, and enhancing operational efficiency without relying on traditional feedback sensors.
Implementation Method 1
at least one oxygen-based sensor (20) in the waste gas path (10)
Data Source
AI summary
Various embodiments of the teachings herein include a method for control of a combustion apparatus. An example includes loading a first characteristic curve from a memory; determining a current value of a performance variable; determining a first input value of the variable for an open-loop control mode; assigning the first input value to a first speed and/or to a first position using the first characteristic curve; determining a first open-loop control signal as a function of the first speed and/or the first position; and sending the first open-loop control signal to the first actuator, wherein the first open-loop control signal causes the first actuator to change a combustion variable including the air supply and/or the fuel supply.