Oxygen Measuring Apparatus for Boiler Combustion Control
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Solution Overview
Problem
Conventional boiler control systems lack precise control over fuel/air ratio, leading to inefficiencies and safety issues due to variations in excess air levels, especially at lower firing rates, where flame instability and combustion efficiency are compromised without adequate oxygen trim control.
Innovation Solution
An oxygen measuring apparatus and control system that includes a UEGO sensor and cartridge for monitoring oxygen concentration in combustion gases, integrated with a closed-loop control system to adjust fuel and air flow, enabling precise oxygen trim control and maintaining stable boiler operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional boiler control systems operate without oxygen trim control, then the system is simpler to operate, but combustion efficiency and flame stability deteriorate, especially at lower firing rates
Solution Approach 1:
The patent implements a closed-loop feedback control system using a UEGO (Universal Exhaust Gas Oxygen) sensor to continuously monitor oxygen levels in the flue gas and automatically adjust the air damper position. This feedback mechanism enables precise oxygen trim control that optimizes combustion efficiency while maintaining system operation through automated control, resolving the contradiction between improved combustion efficiency and operational complexity.
2Loss of energy
If oxygen trim control is implemented to maintain precise fuel/air ratio, then combustion efficiency improves, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The UEGO sensor serves multiple functions: it measures oxygen concentration in the flue gas, provides feedback for closed-loop control, and enables precise fuel/air ratio adjustment. This multi-functional approach consolidates the control system capabilities into a single integrated component, reducing overall device complexity while achieving precise oxygen trim control and improved combustion efficiency.
3Reliability
If conventional systems operate without precise oxygen monitoring, then the system is more reliable with fewer components, but flame stability and safety deteriorate at lower firing rates
Solution Approach 1:
The closed-loop feedback control system continuously monitors oxygen levels and automatically adjusts the air damper to maintain optimal fuel/air ratio. This real-time feedback ensures flame stability and safe operation across all firing rates, particularly at lower rates where manual control is insufficient, while the robust sensor design maintains overall system reliability.
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 achieves improved combustion efficiency and safety by accurately monitoring and adjusting oxygen levels, addressing the inefficiencies and instability issues in conventional systems, particularly at lower firing rates.
Implementation Method 1
an oxygen sensor arranged inside the inlet pipe between the first end of the inlet pipe and the second end of the inlet pipe, the oxygen sensor having a communication medium disposed thereon
Implementation Method 2
a filtering medium arranged inside the inlet pipe between the oxygen sensor and the first end of the inlet pipe
Data Source
AI summary
An oxygen measuring apparatus (500) includes an inlet pipe (506) having a first end and a second end, an oxygen sensor (511) arranged inside the inlet pipe (506) between the first end of the inlet pipe and the second end of the inlet pipe, the oxygen sensor (511) having a communication medium (515) disposed thereon and extending through the second end of the inlet pipe (506), a filtering medium arranged (505) inside the inlet pipe between the oxygen sensor (511) and the first end of the inlet pipe, a housing (501) arranged against the second end of the inlet pipe, and a sensor control interface (512) arranged within the housing (501) and in communication with the communication medium (515) of the oxygen sensor (511).