Streamlined Burner Nozzle Trailing Edge Injection
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Solution Overview
Problem
Conventional burners are unsuitable for using fuels containing hydrogen gas, leading to increased pollutant emissions and flashback risks due to higher reactivity, as they ignite before sufficient intermixing with oxidizer gas occurs.
Innovation Solution
A burner design featuring a rectilinear streamlined body with nozzles positioned at the trailing edge, extending across the entire flow cross-section, which reduces flow resistance and avoids recirculation zones, allowing for improved intermixing of fuel and oxidizer gases, and optionally includes carrier gas introduction to enhance mixing and ignition delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional burners are used with hydrogen-containing fuel, then the burner can operate with the fuel, but pollutant emissions increase and flashback risk rises due to premature ignition
Solution Approach 1:
The patent inverts the conventional injection approach by positioning nozzles at the trailing edge of the streamlined body instead of the leading edge or center. This reversal allows fuel to be injected into the oxidizer flow in a direction that promotes immediate mixing, preventing premature ignition and reducing pollutant emissions while maintaining versatility with hydrogen-containing fuels
2Speed
If fuel inflow velocity is increased to prevent premature ignition, then ignition delay is extended, but fuel gas concentration increases near burner walls leading to higher pollutant values and flashback
Solution Approach 1:
The streamlined body acts as an intermediary structure that mediates between fuel injection and oxidizer flow. By positioning nozzles at the trailing edge, the streamlined body ensures fuel is immediately mixed with oxidizer in the high-velocity flow, preventing fuel accumulation near walls while maintaining controlled ignition delay
3Device complexity
If a cylindrical lance is used for fuel injection, then the structure is simple, but flow resistance is high and recirculation zones form where fuel can ignite prematurely
Solution Approach 1:
The patent applies streamlined curvature to the injection device body, replacing the cylindrical lance with a streamlined shape that has curved surfaces optimized for fluid flow. This curvature reduces flow separation and recirculation zones while maintaining structural simplicity, thereby reducing energy loss without increasing device complexity
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 achieves reduced pollutant emissions and lower flashback risks by ensuring homogeneous fuel introduction and intermixing, even with hydrogen-rich fuels, while maintaining efficient flow and minimizing fuel concentration near burner walls.
Implementation Method 1
Streamlined bodies are distinguished by low flow resistance, which here is conducive to the throughflow of the burner
Implementation Method 2
Injection with a small angle relative to the main flow direction is possible, as long as recirculation of fuel gas due to eddies, which can form in the wake of fuel jet penetrating into the main flow, is avoided
Implementation Method 3
In interaction with an oxidizer flow flowing axially through the burner, an axial fuel deflection is obtained, and also an intensive intermixing of the fuel flow with the oxidizer flow
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a burner (1) for a combustion chamber of a gas turbine plant, with an injection device (7) for introducing gaseous fuel into the burner (1). The injection device (7) has a body (8) which is arranged in the burner (1) and which has at least one nozzle (9) for introducing gaseous fuel into the burner (1). The body is configured as a streamlined body (8) which has a streamlined cross-sectional profile (10) and which extends with its longitudinal direction (11) transversely with respect to a main flow direction (12) prevailing in the burner (1). The at least one nozzle (9) has its outlet orifice (13) at an trailing edge (14) of the streamlined body (8).