Axially Adjustable Burner Nozzle for Soot-Free Combustion
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Solution Overview
Problem
Existing burners with fixed mixing heads lack variability in air volume and speed adjustment, leading to potential sooting and limited operational flexibility.
Innovation Solution
A burner with an axially displaceable nozzle assembly and a speed-controlled fan, allowing for adjustable air outflow cross-section, speed, and pressure, combined with a manually or automatically rotatable recirculation means to vary the recirculation openings, ensuring flexible operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mixing head is made axially displaceable to adjust air volume and speed, then operational flexibility is improved, but leakage air can flow along the outer edge of the movable nozzle leading to sooting
Solution Approach 1:
The air nozzle is designed to be axially displaceable within the holder, allowing dynamic adjustment of the air outflow cross-section and air speed while maintaining a sealed connection that prevents leakage air from causing sooting
Solution Approach 2:
By changing the axial position of the air nozzle, the air outflow cross-section and air speed parameters can be varied to optimize combustion conditions without creating leakage paths that lead to sooting
2Reliability
If the mixing head is made axially fixed to prevent sooting, then reliability is improved, but air volume and speed cannot be varied
Solution Approach 1:
The air nozzle is designed to be axially displaceable within the holder, allowing dynamic adjustment of the air outflow cross-section and air speed while maintaining a sealed connection that prevents leakage air from causing sooting
Solution Approach 2:
The holder provides a fixed sealed structure that prevents sooting, while the air nozzle within it can move axially to vary air parameters, separating the sealing function from the adjustment function
3Adaptability or versatility
If the nozzle assembly is made axially displaceable to change air outflow cross-section, then adaptability is improved, but device complexity increases
Solution Approach 1:
The air nozzle is designed to be axially displaceable within the holder, allowing dynamic adjustment of the air outflow cross-section and air speed while maintaining a sealed connection that prevents leakage air from causing sooting
Solution Approach 2:
The air nozzle is nested within the holder structure, allowing the nozzle to move axially independently while being guided and sealed by the holder, reducing the overall complexity of the movable assembly
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 modulating operation with improved mixing of combustion air, recirculating gases, and fuel, reducing sooting and emissions, while maintaining low pollutant levels and high combustion efficiency.
Implementation Method 1
the separating disk has twist openings in order to twist the air flowing through the burner tube when it enters the air nozzle. Swirled air improves the mixing of the combustion air, the recirculating hot exhaust gases and the injected fuel spray.
Implementation Method 2
Recirculation openings are often arranged in a transition area between the burner tube and the flame tube. Such burners with recirculation mixing devices are referred to as blue burners. Thanks to their flue gas-cooled flame, blue burners achieve the lowest levels of pollutants
Implementation Method 3
In conjunction with a speed-controlled burner fan, the air volume required for combustion, the air speed and the air pressure can be adjusted according to a characteristic curve.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The apparatus (10) has a flame tube (30) connected to a burner tube (20), and an injection tube (40) arranged in the burner tube. An air nozzle (60) is coaxially arranged in the burner tube, and extends in the flame tube and guides combustion air from the burner tube into the flame tube. A holder (43) coaxially holds the injection tube in the burner and flame tubes. The nozzle is axially fixed in the burner tube. The injection tube is axially displaceable in the burner tube. A cutting disk (50) locks an interior of the burner tube against an interior of the flame tube.