Ultra-Low-NOx Multi-Port Burner Array for Flexible Turndown
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Solution Overview
Problem
Existing low NOx burners face limitations in emissions turndown flexibility, restricting operating ranges and furnace output control, particularly in industrial applications.
Innovation Solution
A low NOx burner apparatus with multiple low-capacity fuel and air swirlers arranged in an array, allowing individual or groups of swirlers to be turned on or off, and utilizing discharge sleeves to separate swirler outlets for an air staged mode of operation, enabling fuel cutoff while maintaining air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional low NOx burners are used to reduce emissions, then NOx emissions are reduced, but emissions turndown flexibility is restricted
Solution Approach 1:
The burner is divided into multiple independent swirlers arranged in an array, where each swirler can be individually controlled. This segmentation allows selective activation of different swirler groups based on required burner capacity, enabling emissions turndown ratios of up to 40:1 while maintaining low NOx emissions through precise control of combustion zones.
Solution Approach 2:
The burner employs dynamic control mechanisms that allow real-time adjustment of swirler operation. Individual or groups of swirlers can be turned on or off based on required burner capacity, and discharge sleeves can separate outlets to enable air staged mode, providing adaptive flexibility in emissions turndown while maintaining NOx reduction performance.
2Adaptability or versatility
If multiple swirlers are added to improve turndown ratio, then emissions turndown flexibility is improved, but device complexity increases
Solution Approach 1:
The burner array is supplied by common fuel and air sources that can be directed to one or more swirlers at a time. This multi-functional design allows a single burner apparatus to handle multiple operating conditions and turndown ratios without requiring separate fuel or air supply systems for each swirler, thereby managing complexity while achieving high flexibility.
Solution Approach 2:
Multiple swirlers are combined into a unified array structure with common fuel and air supply systems. The discharge sleeves merge and separate outlets to enable air staged mode, combining multiple functions into an integrated system that achieves high turndown ratios without proportionally increasing overall system complexity.
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
Enables turndown ratios of up to 40:1 with low NOx emissions, enhancing operational flexibility and control over furnace output.
Implementation Method 1
The fuel and the air can be mixed, such that a combustible mixture of the fuel and the air is located downstream from the low-capacity fuel swirlers and the low-capacity air swirlers
Implementation Method 2
the housing can comprise a plurality of discharge sleeves that separates an outlet from the low-capacity fuel swirlers and/or low-capacity air swirlers
Implementation Method 3
a combustible mixture of the fuel and the air is located downstream from the low-capacity fuel swirlers and the low-capacity air swirlers
Data Source
AI summary
A burner apparatus and a method of operating the burner apparatus can include a housing and an array maintained by the housing. The burner apparatus can function according to an air staged mode of operation. The array can include a group of low-capacity fuel swirlers and low-capacity air swirlers, wherein individual or groups of the low-capacity fuel swirlers and/or low-capacity air swirlers among the array can be turned on or off based on a required burner capacity.