Staged Oxidizer Injection for Uniform Flame Temperature
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Solution Overview
Problem
The existing 'swirl well' combustion process struggles with incomplete combustion and the formation of undesirable residues like dioxins and NOx due to temperature gradients and uneven oxidation in the second combustion zone, requiring a long second zone and subsequent filtration systems.
Innovation Solution
A staged injection of a second oxidizing fluid with varying angles of attack is implemented in the second zone to ensure intimate dispersion throughout the flame, achieving a shorter flame with uniform temperature and high combustion intensity, resulting in nearly complete destruction of pollutants without dioxin emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a second oxidizing fluid is introduced helically into the second zone, then poor dispersion of difficult-to-flammable pollutants is avoided, but the flame becomes relatively long and combustion residues remain at the exit
Solution Approach 1:
The second oxidizing fluid is introduced in multiple stages (at least two stages) rather than as a single injection, with each stage having a different angle of attack. This segmented approach allows progressive penetration and dispersion throughout the flame thickness, achieving complete oxidation without excessive flame length
Solution Approach 2:
Different injection angles are used at different stages to target different regions of the flame. The varying angles ensure that the oxidizing fluid reaches all layers of the flame uniformly, creating homogeneous oxidation conditions throughout the combustion zone rather than concentrating oxidizer at specific locations
2Power
If the flame temperature reaches 800°C-1000°C at the exit from the second zone, then combustion is maintained, but undesirable residues such as dioxin and NOx are formed
Solution Approach 1:
The injection parameters of the second oxidizing fluid (flow rate, angle of attack, injection timing) are optimized to control the combustion process. By adjusting these parameters, the flame temperature is maintained within an optimal range that ensures complete combustion while avoiding the 800°C-1000°C zone that promotes dioxin and NOx formation
Solution Approach 2:
The staged injection ensures continuous and homogeneous oxidation throughout the flame, preventing localized incomplete combustion that would lead to harmful residues. The multi-stage approach maintains steady combustion conditions that avoid temperature fluctuations into the harmful range
3Productivity
If a relatively long second zone (7m to 8m) is used, then complete combustion is achieved, but the device complexity and filtration systems increase
Solution Approach 1:
By changing the injection parameters of the second oxidizing fluid (particularly the staged injection with varying angles), the combustion efficiency is dramatically improved within a shorter zone. This parameter optimization achieves near-complete destruction (99.99%) without requiring the 7m to 8m length, thereby reducing device complexity and eliminating the need for downstream filtration systems
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
This approach achieves a destruction efficiency of 99.99% with no dioxin or NOx emissions, allowing for absorption of halogen acids and eliminating the need for residue handling and heat treatment, while maintaining a constant temperature gradient across the flame.
Implementation Method 1
a second oxidizing fluid is introduced into the second zone with a component tangential to the well-swirl flow... the injection of the second oxidizing fluid is carried out in a staged manner with a different angle of attack at each stage so as to disperse said second oxidizing fluid intimately and in a graduated manner throughout the thickness of the flame
Implementation Method 2
the oxidizer-fuel mixture is caused to ignite so as to produce in the first zone a combustion phase animated by a movement along a helical trajectory... the oxidation of the sprayed particles
Implementation Method 3
the oxidation of the sprayed particles does not seem homogeneous at the different points of the flame... improve the oxidation of the particles sprayed at any point of the flame
Data Source
Figure 1~7
Figure 2~4
AI summary
The invention relates to a method for heat treating at least one effluent comprising fuel pollutants, wherein: a first comburent fluid and a combustible fluid are fed into a first area (A), said first comburent fluid and/or said combustible fluid being fed along a helical path; the comburent-combustible mixture is ignited such that a combustion phase is carried out along a helical path in the first area; said combustion phase is forced to pass into a second area (B) via a passage (P) restricted so as to give it the shape of an axially symmetrical vortex well flow; the effluent to be treated is fed at the area of axial symmetry of said vortex well flow; a second comburent fluid is fed into the second area (B) with a component tangential to the vortex well flow, characterized in that the second comburent fluid is injected in a stepped manner with a different angle of attack at each step. Said specific injection enables precise and gradual dispersion of the second comburent fluid into the entire body of the flame.