Angled Multi-Stage Burner Mixing Units for Uniform Combustion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional industrial burners have inadequate air-fuel mixing, leading to inefficient combustion, high nitrogen oxide emissions, and environmental pollution, due to parallel arrangement of air and fuel nozzles which results in insufficient fuel combustion and low thermal efficiency.
Innovation Solution
The burner design features multiple-stage mixing units with angled fuel and air channels, creating a negative pressure to enhance fuel-to-air ratio and uniform mixing, preventing flashback and burnout, and includes a firing plate with progressively decreasing diameters for staged mixing of air and fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air and fuel nozzles are arranged in parallel, then the structure is simple, but the air-fuel mixing is inadequate leading to insufficient combustion
Solution Approach 1:
The burner is divided into multiple combustion units, each with independent air and fuel nozzles arranged in series rather than parallel. This segmentation allows each unit to achieve proper mixing while maintaining overall system simplicity
Solution Approach 2:
The air and fuel nozzles are arranged in a series configuration along the combustion chamber length rather than parallel at the same location. This dimensional rearrangement enables progressive mixing of air and fuel along the flow path, achieving adequate mixing without complex nozzle structures
2Device complexity
If fuel and air are discharged in the same direction from parallel nozzles, then the discharge structure is simple, but the mixture outside the combustion head is insufficient
Solution Approach 1:
Air is introduced before the fuel in the series arrangement, creating a pre-mixing zone where air prepares the combustion environment before fuel injection. This preliminary action ensures proper mixing occurs within the combustion chamber rather than outside, improving thermal efficiency
Solution Approach 2:
The combustion chamber itself acts as an intermediary mixing zone between the air and fuel nozzles. By positioning nozzles in series along the chamber, the chamber volume serves as the mixing space, eliminating the need for external mixing structures
3Device complexity
If conventional parallel nozzle arrangement is used, then the burner structure is simple, but nitrogen oxide emissions are high due to insufficient combustion
Solution Approach 1:
Multiple combustion units with series-arranged nozzles create segmented combustion zones. Each unit achieves complete combustion independently, ensuring thorough fuel consumption and reducing unburned hydrocarbons and nitrogen oxide formation
Solution Approach 2:
The series arrangement of nozzles changes the flow parameters along the combustion path, creating optimal temperature and mixing conditions at different positions. This parameter optimization along the flow path ensures complete combustion and reduces harmful emissions
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 improved energy efficiency, reduced NOx emissions, and more uniform combustion, resulting in higher thermal efficiency and lower environmental impact compared to conventional burners.
Implementation Method 1
The air flow velocity of the air channel can be configured to be greater than the fuel flow velocity of the fuel channel such that a negative pressure can be generated at a mixing location of the air and fuel. The negative pressure generated in this way may draw more fuel discharged from the outlet of the fuel channel
Implementation Method 2
an outlet of the at least one fuel channel and an outlet of the at least one air channel are angled at a certain angle relative to one another such that the fuel discharged from the outlet of the fuel channel can be sufficiently mixed with the air discharged from the outlet of the air channel
Implementation Method 3
An outlet of the at least one fuel channel and an outlet of the at least one air channel are angled at a certain angle relative to one another such that the fuel discharged from the outlet of the fuel channel can be sufficiently mixed with the air discharged from the outlet of the air channel
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A burner (10) and methods using thereof are provided. The burner (10) comprises at least one air pipe (13), at least one fuel pipe (14) and a plurality of groups of mixing units disposed at a downstream end of the burner (10). Each of the plurality of groups of mixing units is arranged coaxially and adjacent to one another, and each group of mixing units comprises at least one fuel channel (24) connected to the at least one fuel pipe (14) and at least one air channel (23) connected to the at least one air pipe (13). An outlet of the at least one fuel channel (24) and an outlet of the at least one air channel (23) are angled at a certain degree relative to one another such that the fuel flowing out of the outlet of the at least one fuel channel (24) is mixed with the air flowing out of the outlet of the at least one air channel (23), thereby achieving multiple-stage mixing of the air and fuel.