Premix Burner Fuel Segmentation for Flashback Control
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Solution Overview
Problem
Premix burners face challenges in efficiently combusting fuels containing hydrogen, such as synthesis gas, due to high reaction tendencies leading to flashback and increased nitrogen oxide emissions, especially when transitioning from natural gas to hydrogen-based fuels.
Innovation Solution
The burner design incorporates separate feeders for synthesis gas and natural gas along the transition section, allowing for flexible operation with different fuels, with synthesis gas being fed closer to the wall to reduce flow vortex formation and enhance intermixing, and natural gas being fed with a radial component to maintain homogeneous mixing, reducing the risk of flashback and nitrogen oxide emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synthesis gas is fed into the burner, then hydrogen combustion is achieved, but flashback risk increases due to high reaction tendency
Solution Approach 1:
The burner is divided into multiple feeding sections: a first feeder for synthesis gas along the transition section and a second feeder for natural gas along the burner axis. This segmentation allows separate control of fuel introduction points, enabling optimization of flow patterns to prevent flashback while maintaining fuel flexibility.
Solution Approach 2:
Different fuel types are introduced at different locations with different flow characteristics. Synthesis gas is fed along the transition section with specific flow velocity to prevent vortex formation, while natural gas is fed axially. This local differentiation of fuel introduction methods optimizes combustion stability for each fuel type.
2Productivity
If synthesis gas is combusted, then hydrogen utilization is achieved, but nitrogen oxide emissions increase
Solution Approach 1:
The burner design pre-establishes optimized flow patterns and mixing conditions before combustion occurs. By controlling the flow velocity of synthesis gas along the transition section and creating appropriate vortex patterns, the system prepares the fuel-air mixture for efficient combustion that reduces nitrogen oxide formation.
Solution Approach 2:
The system changes flow parameters such as velocity, mixing ratio, and flow direction to optimize combustion. By adjusting these parameters, the burner achieves efficient hydrogen combustion while controlling temperatures and mixing conditions that reduce nitrogen oxide emissions.
3Stability of the object's composition
If fuel is fed along the burner axis, then homogeneous mixing is achieved, but flow vortex formation increases
Solution Approach 1:
The feeding system is segmented into two distinct paths: axial feeding for natural gas and tangential/along-transition-section feeding for synthesis gas. This segmentation allows each fuel type to be introduced in the optimal manner, preventing vortex formation while maintaining mixing homogeneity.
Solution Approach 2:
The fuel introduction method transitions from one-dimensional axial feeding to two-dimensional tangential or along-transition-section feeding for synthesis gas. This dimensional change in flow direction creates more favorable flow patterns that reduce vortex formation while maintaining effective mixing.
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 significantly reduces the risk of flashback and nitrogen oxide emissions by optimizing fuel intermixing and flow velocity profiles, enabling efficient combustion of hydrogen-containing fuels while maintaining stable operation across varying fuel loads and types.
Implementation Method 1
a swirled flow consisting of combustion air and admixed fuel, which conically widens in the flow direction, is produced
Implementation Method 2
combusting hydrogen in a premix burner
Implementation Method 3
the partial oxidation of the fuel with oxygen
Data Source
AI summary
A device for combusting fuel which contains or consists of hydrogen, is described, with a burner provided with a swirl generator and also a feeder for feeding fuel and a feeder for feeding combustion air into the swirl generator. A first feeder, for feeding liquid fuel along a burner axis, and a second feeder for feeding liquid fuel or gaseous fuel along air inlet slots which are tangentially delimited by the swirl generator, with a transition section connected downstream to the swirl generator, and with a mixer tube connected downstream to the transition section and with a changeable flow cross-sectional transition leads into a combustion chamber are provided. Along the transition section, a third feeder for feeding fuel which contains or consists of hydrogen, and also a fourth feeder for the selective feed of fuel which contains or consists of hydrogen, or of the gaseous fuel are also provided.