Gas Burner Flame Stability via Segmented Gas Supply
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Solution Overview
Problem
Current gas-fired burners for asphalt mixing plants fail to produce a stable and well-developed flame over a wide load range, limiting their versatility and increasing product diversity and spare parts management complexity.
Innovation Solution
A gas-fired burner design featuring a central primary air duct with radial gas supply openings around the swirl body, a concentric secondary air duct, and a conical combustion zone, allowing for optimal mixing and adjustment of fuel and air flows to maintain a stable flame across varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel gas is introduced into the primary air upstream of the primary air swirl body, then the burner can operate, but the flame stability deteriorates over a wide load range
Solution Approach 1:
The fuel gas supply is segmented into multiple gas supply openings distributed around the circumferential boundaries of the swirl body, allowing different zones to contribute to flame stability across varying loads. This segmentation enables the burner to maintain reliable operation throughout a wide load range by optimizing fuel distribution.
Solution Approach 2:
The gas supply openings are strategically positioned at specific locations (between swirler blades, at negative pressure sides, at outlet edges) to create local optimization zones. This local quality enhancement ensures that fuel gas is introduced at optimal points for mixing and combustion, improving flame stability while adapting to different load conditions.
2Adaptability or versatility
If multiple burner types are used to cover different applications, then application coverage improves, but product diversity and spare parts management complexity increase
Solution Approach 1:
The burner design incorporates adjustable primary and secondary air flows, variable gas supply configurations, and a flexible combustion zone geometry that can adapt to different heating requirements. This universality allows a single burner type to serve multiple applications (different load ranges and heating demands) without increasing product diversity or complicating spare parts management.
Solution Approach 2:
The burner features adjustable air flow ratios and configurable gas supply openings that can be dynamically optimized for different operating conditions. This dynamic adaptability enables the same burner hardware to efficiently cover various applications and load ranges, eliminating the need for multiple specialized burner types.
3Quantity of substance
If gas supply openings are added to the swirl body, then fuel gas mixing improves, but the primary air flow may be affected
Solution Approach 1:
The gas supply openings are asymmetrically positioned between the swirler blades at specific locations (negative pressure sides and outlet edges) rather than uniformly distributed. This asymmetric placement optimizes fuel gas introduction points to enhance mixing while minimizing disruption to the primary air flow path and swirl characteristics.
Solution Approach 2:
The swirl body acts as an intermediary structure that facilitates the integration of fuel gas into the primary air flow. By positioning gas supply openings within the swirl body at strategically selected locations, the design enables effective fuel-air mixing while the swirl body itself maintains the primary air flow characteristics through its blade geometry and rotational flow pattern.
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 burner achieves a stable and well-developed flame over a large load range, ensuring consistent performance and simplifying component management by optimizing fuel and air distribution within the combustion zone.
Implementation Method 1
a central primary air duct (5), which opens into a combustion zone (4) via a swirler (2)
Implementation Method 2
the burner has gas supply openings (9) in the area of the circumferential boundaries of the swirl body (2) for supplying fuel gas into the primary air
Implementation Method 3
supplying fuel gas into the primary air for firing the burner
Implementation Method 4
opens into a combustion zone (4) via a swirler (2)
Data Source
AI summary
A gas-fired burner for a drying drum of an asphalt mixing plant, such that the burner preferably has a central primary air duct (6), which opens into a combustion zone (4) via a swirl body (2). The burner has gas supply openings (9) in the area of the circumferential boundaries of the swirl body (2) for supplying fuel gas to the primary air for firing the burner. It has been shown that a stable and well-developed flame can be produced over a very large load range with such burners according to the disclosure.