Ribbon Burner NOx Reduction via Flue Gas Recirculation
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Solution Overview
Problem
Ribbon burners face challenges in reducing nitrogen oxide emissions while maintaining simplicity, reliability, and low cost, as existing methods like using porous materials compromise power output and durability.
Innovation Solution
Recirculating a portion of carbon dioxide-containing flue gas combustion products into the primary and secondary oxidizer supplies to reduce oxygen content and lower flame temperature, thereby reducing NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If porous or mesh materials are used instead of corrugated metal strips to reduce NOx emissions, then thermal NOx formation is reduced through radiation mode operation and lower flame temperature, but power output is limited and reliability and durability are reduced
Solution Approach 1:
The invention changes the chemical composition parameter of the oxidizer by adding CO2 to reduce oxygen concentration and lower flame temperature, thereby reducing thermal NOx formation while maintaining the reliable corrugated metal strip structure and avoiding power output limitations
Solution Approach 2:
The invention converts CO2, normally a harmful emission, into a beneficial additive that suppresses thermal NOx formation by diluting the oxidizer and lowering flame temperature, thus transforming a pollutant into a tool for emission control
2Object-generated harmful factors
If flue gas recirculation is used to reduce NOx emissions, then oxygen content in oxidizer supply is reduced and flame temperature is lowered, but system complexity increases
Solution Approach 1:
The invention uses CO2 as an intermediary substance added to the oxidizer supply to achieve NOx reduction without requiring complex flue gas recirculation systems, thereby simplifying the overall system while maintaining effectiveness
Solution Approach 2:
The invention extracts only the beneficial CO2 component needed for NOx suppression and adds it directly to the oxidizer supply, avoiding the complexity of recirculating entire flue gas streams while achieving the desired oxygen dilution effect
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
Significantly reduces NOx emissions by up to 50% without sacrificing the reliability and cost-effectiveness of ribbon burners, allowing compliance with stricter emission regulations.
Implementation Method 1
Recirculating a portion of carbon dioxide-containing flue gas combustion products into the primary and secondary oxidizer supplies to reduce oxygen content and lower flame temperature
Implementation Method 2
combust a fuel gas and form a flue gas containing combustion products
Implementation Method 3
reducing thermal NOx formation
Data Source
AI summary
Methods and systems for improving burner, particularly ribbon burner performance, involving admixing a portion of the combustion products from the flue gas resulting from the burner to at least one of a primary and a secondary oxidizer supply to the burner. Admixing a portion of a carbon dioxide-containing flue gas combustion product formed upon combustion of a fuel gas by a ribbon burner significantly reduces NOx emissions resulting from operation of the burner.