Split Flame Stabilizer for Low-NOx Combustion Burners
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Solution Overview
Problem
Conventional combustion burners emit high amounts of nitrogen oxides (NOx) due to the formation of high-temperature, high-oxygen areas in the outer peripheral regions of the combustion flame, which are not effectively addressed by existing technologies.
Innovation Solution
A combustion burner design that stabilizes the flame internally within the fuel nozzle, using a flame holder with a splitting shape to branch the fuel gas and maintain a low temperature in the outer peripheral region, reducing NOx emissions by injecting secondary air to cool the outer flame in a high-oxygen atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If outer flame stabilization is employed in conventional combustion burners, then flame stability is improved, but NOx emission increases due to high-temperature and high-oxygen areas in the outer peripheral part
Solution Approach 1:
The invention inverts the conventional flame stabilization approach by stabilizing the flame in the central area rather than the outer peripheral area. The fuel nozzle is designed with a central opening and multiple peripheral openings, where the central opening stabilizes the flame core and peripheral openings supply fuel to the outer region, reversing the traditional stabilization location to reduce NOx formation in high-temperature outer regions
Solution Approach 2:
The fuel nozzle is segmented into multiple opening regions: a central opening for primary flame stabilization and multiple peripheral openings for secondary fuel supply. This segmentation allows different zones to serve different functions, with the central zone providing stable flame anchoring and peripheral zones controlling the temperature and composition of the outer flame region to reduce NOx emissions
2Power
If high-temperature combustion is maintained for efficient energy release, then combustion efficiency is improved, but NOx emission increases due to high-temperature and high-oxygen conditions
Solution Approach 1:
The invention applies local quality by creating different combustion conditions in different spatial zones: the central region maintains high-temperature combustion for efficient energy release, while the peripheral regions controlled by peripheral openings regulate oxygen concentration and temperature to prevent NOx formation. Each zone has optimized fuel-air mixing characteristics suitable for its specific function
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 internal flame stabilization reduces NOx emissions by maintaining the outer peripheral part of the combustion flame at a lower temperature, effectively decreasing NOx production and improving boiler efficiency.
Implementation Method 1
a flame holder 5 arranged in a central area of an opening 21 of the fuel nozzle 2, wherein, when seen in cross section along the direction in which the flame holder 5 widens, the flame holder 5 has a splitting shape that widens in the flow direction of the fuel gas
Implementation Method 2
with the secondary air, the temperature of the outer peripheral part of the combustion flame in a high oxygen atmosphere can be lowered
Implementation Method 3
a fuel nozzle 2 that injects fuel gas prepared by mixing pulverized coal and primary air
Data Source
Figure 1~2
Figure 3~4
Figure 5~6B
AI summary
Disclosed is a combustion burner (1) provided with a fuel nozzle (2) for injecting fuel gas obtained by combining solid fuel and primary air, secondary air nozzles (3, 4) for injecting secondary air from the outer periphery of the fuel nozzle (2), and a flame stabilizer (5) disposed at the opening of the fuel nozzle (2). In the combustion burner (1), the flame stabilizer (5) has a split shape which widens in the flow direction of the fuel gas. Furthermore, in the section viewed in the direction that the flame stabilizer (5) widens, among the sections of the fuel nozzle (2) including the center axis, the maximum distance (h) between the center axis of the fuel nozzle (2) and the widened end of the flame stabilizer, and the inner diameter (r) of the opening (21) of the fuel nozzle (2) satisfy the relationship of h/ (r/2)<0.6.