Radiant Burner Uniform Temperature via Plenum Stoichiometry
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Solution Overview
Problem
Existing radiant burners experience temperature variations along the combustion chamber, leading to reduced efficiency and lifespan due to uneven heat distribution, which is not adequately addressed by current methods for processing effluent gas streams containing perfluorinated compounds in manufacturing processes.
Innovation Solution
A radiant burner design featuring a combustion chamber with a porous sleeve and a plenum that supplies combustion materials with varying stoichiometry along its length, adjusting the fuel-to-oxidant ratio to maintain uniform temperature by increasing oxidant stoichiometry near the effluent gas inlet and decreasing it near the exhaust, thereby compensating for heat generation and loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If uniform stoichiometry is used throughout the combustion chamber, then the combustion process is simple to control, but temperature variations occur along the length of the combustion chamber reducing efficiency and lifespan
Solution Approach 1:
The plenum is divided into multiple zones along the length of the porous sleeve, with each zone receiving combustion materials at different stoichiometric ratios. The first zone (near the effluent gas inlet) receives a first stoichiometry while the second zone (near the exhaust) receives a second stoichiometry, creating local variations in heat generation that compensate for axial temperature gradients and achieve more uniform temperature distribution throughout the combustion chamber.
2Reliability
If varying stoichiometry is implemented along the porous sleeve length, then temperature uniformity is improved, but the plenum structure becomes more complex
Solution Approach 1:
The plenum is segmented into distinct zones corresponding to different sections of the porous sleeve, with each segment supplied with combustion materials at appropriately tailored stoichiometric ratios. This segmentation allows independent control of heat generation in different axial regions, protecting the porous sleeve from thermal degradation and extending burner lifespan while maintaining a relatively simple overall structure.
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 achieves a more uniform temperature distribution along the combustion chamber, reducing thermal degradation and enhancing the efficiency and lifespan of the radiant burner while effectively treating effluent gas streams.
Implementation Method 1
a combustion chamber having a porous sleeve through which combustion materials pass for combustion proximate to a combustion surface of the porous sleeve
Implementation Method 2
the plenum being configured to provide the combustion materials with varying stoichiometry along a length of the porous sleeve
Implementation Method 3
By varying the stoichiometry of the combustion materials to compensate for variations in the heat generated within the combustion chamber along the length of the porous sleeve, a more uniform temperature can be achieved
Data Source
AI summary
A radiant burner for treating an effluent gas stream from a manufacturing process tool may include: a combustion chamber having a porous sleeve through which combustion materials pass for combustion proximate to a combustion surface of the porous sleeve; and a plenum surrounding the porous sleeve supplying the combustion materials to the porous sleeve, the plenum being configured to provide the combustion materials with varying stoichiometry along a length of the porous sleeve. This approach of varying the stoichiometric ratios of the combustion materials correspondingly varies the heat generated by those combustion materials along the length of the porous sleeve. By varying the stoichiometry of the combustion materials to compensate for variations in the heat generated within the combustion chamber along the length of the porous sleeve, a more uniform temperature can be achieved along the length of the porous sleeve within the combustion chamber.