Center Fuel Stabilization Bluff Body for Premix Burner Flame Stability
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Solution Overview
Problem
Conventional premix burner assemblies face stability issues, particularly in the lower operation range, with undesirable flashbacks and blow-offs, and struggle to maintain combustion quality and stability with lean mixtures.
Innovation Solution
An apparatus and method that includes a center fuel stabilization bluff body, comprising a ring and cylinder, to enhance fuel mixing with combustion air, producing a stabilizing base flame that can be run throughout the firing range without affecting emissions, and includes a conduit and valves to manage fuel flow between gaseous and liquid fuel lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional premix burner assemblies are used, then the burner can operate across a range of conditions, but flame stability deteriorates in the lower portion of the operation range with flashbacks and blow-offs occurring
Solution Approach 1:
The burner assembly is segmented into multiple functional zones: a premix main burner for primary combustion and a stabilizing base flame system for flame anchoring. The fuel delivery system is divided into separate lines (first fuel line for main burner, second fuel line for base flame) that can be independently controlled, allowing the base flame to stabilize the main flame across varying operating conditions without compromising overall system adaptability
Solution Approach 2:
A stabilizing base flame acts as an intermediary element between the fuel source and the main burner flame. This base flame, produced by the second fuel line and nozzle, provides a stable ignition source and flame anchor that prevents flashbacks and blow-offs, mediating the combustion process to maintain reliability across the full operation range
2Use of energy by moving object
If leaner premix gas mixtures are used to improve efficiency, then energy efficiency improves, but flame stability deteriorates making safe operation difficult throughout the entire firing range
Solution Approach 1:
The system changes the fuel delivery parameters by introducing a separate stabilizing base flame with controlled fuel flow through the second fuel line. This base flame provides sufficient fuel concentration for stable combustion even when the main burner operates with lean mixtures, enabling the system to maintain flame stability across the entire firing range while operating at higher efficiency with leaner premix ratios
3Reliability
If a stabilizing base flame is added to improve flame stability, then flame stability improves, but device complexity increases with additional fuel lines and components
Solution Approach 1:
The stabilizing base flame system is designed with multi-functionality to justify the added complexity. The second fuel line and nozzle serve multiple purposes: providing flame stabilization, enabling operation across the full firing range, and allowing independent control of base flame versus main burner fuel flow. This universal approach consolidates multiple functions into a single integrated system rather than requiring separate stabilization devices
Solution Approach 2:
The stabilizing base flame system is merged with the existing premix burner assembly, integrating the second fuel line and nozzle into the overall burner structure. The base flame and main burner operate as a unified combustion system with coordinated fuel delivery, reducing the need for separate stabilization components and minimizing overall device complexity while maintaining improved flame stability
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 solution improves the stability and symmetry of the premix main burner flame, reduces flashbacks and blow-offs, enables combustion of leaner mixtures, and maintains combustion quality across the entire firing range, including higher lean mixtures.
Implementation Method 1
enhance the mixing of stabilizing base flame fuel with main combustion air
Implementation Method 2
produces a symmetrical center base flame pattern that fills any vortices produced by the main flame
Data Source
AI summary
An apparatus for producing a stabilizing base flame for a premix main burner flame in a burner assembly having a burner end, a first fuel line, a first fuel nozzle, a second fuel line, and a second fuel nozzle. The apparatus comprises a conduit having a first fuel line end in fluid communication with the first fuel line, a second fuel line end in fluid communication with the second fuel line, a valve in fluid communication with the conduit and a center fuel stabilization bluff body mounted in the burner end. The center fuel stabilization bluff body comprises a first ring, a second ring and a cylinder disposed between the first ring and the second ring.