Burner Nozzle Conical Gas Dispersing Element
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Solution Overview
Problem
Existing burner nozzles for atomizing liquid fuel with compressed gas struggle to maintain optimal air-fuel mixing and achieve a large turn-down ratio while ensuring a monodisperse and predictable spray over a wide output range, particularly when burning diluted boil-off gas from liquefied natural gas.
Innovation Solution
A burner nozzle design featuring a first outlet for compressed gas with an outwardly extending conical portion and a second outlet for liquid fuel, arranged rotationally symmetrically, along with a gas dispersing element that forms a conical pattern to enhance atomization, allowing for reduced fuel supply pressure and stable monodisperse spray across a large fuel flow rate range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional burner nozzles are used for atomizing liquid fuel with compressed gas, then the basic atomization function is achieved, but the spray uniformity and air-fuel mixing performance deteriorate over a wide output range
Solution Approach 1:
The gas outlet is segmented into multiple individual outlet openings arranged in a specific pattern, with each opening contributing to the overall gas flow that interacts with the liquid fuel. This segmentation allows better control of gas-liquid interaction across different output ranges while maintaining consistent spray uniformity.
Solution Approach 2:
The nozzle design incorporates specific geometric features at critical locations: the liquid fuel outlet has a particular cross-sectional shape, the gas outlet openings have specific dimensions and arrangements, and the outlet chamber has tailored geometry. These localized geometric optimizations ensure optimal atomization performance across the entire output range.
2Manufacturing precision
If high fuel supply pressure is used to achieve good atomization, then the spray quality improves, but the system complexity and operational flexibility worsen
Solution Approach 1:
The nozzle design enables self-atomization where the liquid fuel's own kinetic energy and the compressed gas flow work together to achieve atomization without requiring high fuel supply pressure. The geometric configuration of outlets and chambers creates conditions where the fuel naturally atomizes as it exits, reducing the need for complex high-pressure supply systems.
3Manufacturing precision
If the nozzle design is optimized for a specific output range, then the spray performance improves, but the turn-down ratio and versatility deteriorate
Solution Approach 1:
The nozzle is designed with geometric features that enable it to function effectively across multiple operating conditions and output ranges. The specific arrangement of gas outlet openings, the shape of the liquid fuel outlet, and the outlet chamber geometry work together to maintain consistent spray performance whether operating at high or low fuel flow rates, achieving both optimization and versatility.
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
The nozzle achieves improved performance by providing a stable, monodisperse spray and optimized air-fuel mixture over a wide range, enabling efficient combustion of liquid fuels like diesel oil with compressed air, while allowing for modular design to vary capacity.
Implementation Method 1
a burner nozzle for atomizing liquid fuel with assistance of compressed gas
Implementation Method 2
a gas dispersing element which is arranged to the center axis at a distance from and coaxially with the first outlet
Implementation Method 3
the first outlet comprises an outwardly extending conical portion
Implementation Method 4
optimized air-fuel mixture
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Invention relates to a burner nozzle (10) for atomizing liquid fuel with assistance of compressed gas, comprising a first outlet (16) for compressed gas, having a center axis (18) and a second outlet (20) for liquid fuel. The second outlet (20) is arranged rotationally symmetrically around the first outlet (16) in respect to the center axis (18), the first outlet (16) comprises an outwardly extending conical portion (22), and the burner nozzle (10) comprises a gas dispersing element (24) which is arranged to the center axis (18) at a distance from and coaxially with the first outlet (16) in the direction away from the first outlet (16).