Burner With Movable Deflection Element For Flame Shape Control
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Solution Overview
Problem
In rotary kiln burners, controlling the shape of the flame is challenging, especially when injecting a large volume of fuel, which can lead to inadequate temperature profiles, increased risk of damage to components, and poor control of nitrogen oxide emissions due to insufficient influence of primary air on the flame.
Innovation Solution
A burner design featuring an annular fuel transport circuit with a movable deflection element that adjusts the effective injection angle by varying the distance between inner and outer tubes, allowing for precise control of the radial and axial components of fuel flow, thereby modifying the flame shape and reducing nitrogen oxide emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a large volume of fuel is injected to meet energy demands, then the energy output is improved, but the momentum of fuel injection dominates over primary air momentum causing insufficient control of flame shape
Solution Approach 1:
The fuel injection is segmented into two distinct paths: a central path through the inner tube where fuel receives strong axial momentum from high-pressure primary air, and an outer path through the annular circuit where fuel is injected with controlled radial momentum. This segmentation allows the central fuel stream to be effectively controlled by primary air momentum while the outer fuel stream provides additional energy output, resolving the contradiction between energy output and flame shape control.
2Productivity
If primary air is used to control flame shape and mix with secondary air, then combustion activation is improved, but the influence of primary air becomes insufficient when large volume fuel is injected
Solution Approach 1:
Different qualities of primary air are applied to different fuel streams: high-pressure primary air is directed through the inner tube to provide strong mixing and combustion activation for the central fuel stream, while lower-pressure primary air is used in the annular circuit for the outer fuel stream. This local differentiation allows the central region to maintain effective primary air influence for combustion activation while the outer region provides adaptability for flame shape control.
3Ease of operation
If the distance between inner tube and outer tube is reduced to increase radial component, then flame shape control is improved, but fuel flow distribution becomes less adaptable
Solution Approach 1:
The system employs movable deflectors within the annular circuit that can be dynamically adjusted to change the radial component of fuel injection. By moving these deflectors closer to the inner tube, the radial component increases for better flame shape control. By moving them away, more fuel can flow axially through the annular circuit. This dynamic adjustment resolves the contradiction between flame shape control and fuel flow distribution adaptability.
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 the flexibility of the burner, improves temperature profiles, reduces the risk of component damage, and effectively controls nitrogen oxide emissions by allowing for precise adjustment of the flame shape in response to varying operating conditions and fuel properties.
Implementation Method 1
the momentum generated by this fuel injection can be much greater than the momentum generated by the primary air. Consequently, the shape of the flame and its thermal profile can be greatly affected
Data Source
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AI summary
The invention relates to a burner (1) comprising an annular fuel-transport circuit (2) delimited by an inner tube (3) and an outer tube (4) which are substantially concentric along a longitudinal axis (X), said circuit having: - an upstream portion (2A) and a downstream portion (2B) in the direction of flow of the fuel ending in an open end (2C), - a distance (S) between the inner tube (3) and the outer tube (4) that is variable between the upstream portion (2A) and the downstream portion (2B) of said annular circuit (2), the burner (1) further comprising a deflection member (5) configured to impart a radial component to fuel travelling in said annular circuit (2) from the upstream portion (2A) to the open end (2C). According to the invention, said deflection element (5) can translate between the upstream portion (2A) and the downstream portion (2B).