Perforated Flame Holder Combustion System for Low NOx Emissions
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Solution Overview
Problem
Conventional combustion systems face challenges in achieving clean combustion with low NOx emissions and efficient fuel utilization, often requiring additional measures like selective catalytic reduction or flue gas recirculation to manage pollutants.
Innovation Solution
A combustion system incorporating a perforated flame holder and swirl-stabilized preheating flame, where a perforated flame holder is preheated by a swirl-stabilized preheating flame and subsequently supports a combustion reaction of primary fuel and oxidant, enhancing mixing and maintaining combustion stability with reduced NOx production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional combustion systems are used, then combustion can be maintained, but NOx emissions increase and fuel utilization efficiency decreases
Solution Approach 1:
The system performs preliminary heating of the perforated flame holder using a preheating flame before introducing the main fuel-oxidant mixture. This preheating action prepares the flame holder to immediately sustain combustion upon fuel introduction, eliminating the need for additional pollution control measures while maintaining efficient fuel utilization.
Solution Approach 2:
The invention employs a perforated flame holder with multiple openings that allows the fuel-oxidant mixture to pass through and sustain combustion. The porous/perforated structure enhances mixing and combustion efficiency while naturally limiting NOx formation by distributing the combustion reaction across multiple flow paths, achieving clean combustion without additional pollution control equipment.
2Object-generated harmful factors
If additional pollution control measures are added, then NOx emissions are reduced, but system complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for separate pollution control equipment (such as selective catalytic reduction systems or flue gas recirculation apparatus) by integrating the NOx reduction capability directly into the combustion process itself through the perforated flame holder design and preheating mechanism.
Solution Approach 2:
The combustion system is designed to be self-regulating for emissions control, where the perforated flame holder and preheating flame automatically maintain combustion conditions that inherently produce low NOx emissions without requiring external control systems or additional processing stages.
3Reliability
If combustion stability is prioritized, then reliable operation is achieved, but NOx emissions increase
Solution Approach 1:
The preheating flame performs preliminary heating of the perforated flame holder to establish thermal conditions that ensure immediate and stable combustion upon introduction of the fuel-oxidant mixture. This pre-established thermal environment guarantees combustion stability while the distributed combustion through perforations inherently limits peak temperatures and NOx formation.
Solution Approach 2:
The perforated flame holder structure distributes the combustion reaction across multiple flow paths, which stabilizes combustion by preventing localized flame extinction while simultaneously limiting peak temperatures that lead to NOx formation, achieving both stability and low emissions.
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 clean combustion with low NOx emissions (down to undetectable levels) and efficient fuel utilization without the need for additional pollution control measures, maintaining stability across various operating conditions.
Implementation Method 1
The one or more preheating fuel distributors are configured to support a swirl-stabilized preheating flame of the preheating fuel and the oxidant. The perforated flame holder is positioned to be preheated by the preheating flame during the preheating state.
Implementation Method 2
The one or more preheating fuel distributors are configured to support a swirl-stabilized preheating flame of the preheating fuel and the oxidant.
Implementation Method 3
The perforated flame holder is configured to hold a combustion reaction of the fuel and the oxidant within the perforated flame holder.
Data Source
AI summary
A combustion system supports a swirl-stabilized preheating flame with a preheating fuel and an oxidant. The combustion system preheats a perforated flame holder with the preheating flame. After the perforated flame holder has been preheated to the threshold temperature, the combustion system outputs a primary fuel. The perforated flame holder receives a mixture of the primary fuel and the oxidant supports a combustion reaction of the primary fuel and the oxidant.