Nozzle Assembly with Eddy Formation for Solid Fuel Afterburning
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Solution Overview
Problem
Existing heating devices for solid fuels face challenges in optimizing combustion efficiency and reducing fine dust content in flue gases due to varying operating conditions, such as fuel type, moisture content, and air supply, which affects the completeness of combustion and particle emissions.
Innovation Solution
A primary outlet design featuring hollow profiles with narrowing passages and strategically placed outlet openings promotes the formation of eddies, enhancing mixing of flue gases with secondary air, thereby optimizing combustion and reducing fine dust content. The design includes tear-off edges with acute angles and a concave rear surface to stabilize eddies and improve gas mixing, with adjustable features to adapt to different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flow velocity of flue gases through the nozzle arrangement is increased to draw in more secondary air, then the mixing of flue gases with secondary air is improved, but the flame may break off and combustion in the afterburner is interrupted
Solution Approach 1:
The invention changes the geometric parameters of the nozzle arrangement, specifically the cross-sectional area and shape of the nozzle passages, to optimize the flow velocity profile. By carefully designing the nozzle geometry, the system achieves sufficient flow velocity for effective secondary air intake while maintaining velocities below the flame detachment threshold, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The nozzle arrangement is designed to dynamically adapt to varying operating conditions through its geometric configuration, which allows optimal performance across different fuel types and combustion rates. The fixed geometric design inherently provides dynamic response to changing flow conditions without active control, maintaining stable combustion while maximizing secondary air mixing under varying load conditions
2Object-generated harmful factors
If the heating device is designed to achieve optimally complete combustion and optimally low particulate matter emissions, then combustion efficiency and emission compliance are improved, but the device must be individually adapted to specific operating conditions, increasing device complexity
Solution Approach 1:
The nozzle arrangement is designed with universal geometric features that enable it to perform optimally across multiple operating conditions and fuel types without requiring individual adaptation. The standardized design achieves both complete combustion and low particulate matter emissions universally, eliminating the need for complex customization while meeting emission regulations and efficiency requirements
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 design enhances combustion completeness and reduces fine dust emissions by optimizing the mixing of flue gases with secondary air, improving combustion efficiency and meeting stringent emission regulations.
Implementation Method 1
The resulting acceleration of the flue gases draws the secondary air into the flue gas stream automatically
Implementation Method 2
The flow velocity should be as high as possible in order to automatically draw in as much secondary air as possible from the outlet openings of the hollow profiles
Implementation Method 3
the resulting flue gases still contain a significant amount of carbonaceous, combustible gas that can be utilized. Therefore, the flue gases are fed into a secondary combustion chamber where they are further combusted with additional combustion air to increase fuel utilization
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
In order to achieve optimal combustion with an optimally low fine dust content in a heating device for solid fuels with combustion chamber and afterburning chamber, the primary extraction of the flue gases from the combustion chamber into the afterburning chamber is optimized and simplified by choosing the appropriate shape of the hollow profiles (2), between which the primary extraction takes place, in particular, to improve the formation of eddies of the gases flowing through on the back of the hollow sections (2).