Premixing Combustion Apparatus for NOx Reduction
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Solution Overview
Problem
Conventional combustion apparatuses face challenges in reducing NOx generation and maintaining a stable flame at a position distant from the outlet, as they require complex multi-staged combustion and often rely on pilot flames to prevent flame blowout.
Innovation Solution
A combustion apparatus with a modifying part that converts hydrocarbon fuel into high-temperature hydrogen gas, which is discharged centrally and then jetted with air from an outer supply part to form a flame at a pre-set distance from the outlet, ensuring uniform mixing and reducing NOx generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If multi-staged combustion is used to reduce NOx generation, then NOx generation is reduced, but flame length increases and device structure becomes complicated
Solution Approach 1:
The patent applies preliminary action by pre-mixing fuel and air in a dedicated mixing chamber before combustion. This pre-mixing ensures uniform fuel-air distribution, allowing combustion to occur more efficiently and reducing NOx generation without requiring complex multi-staged combustion systems. The mixing chamber prepares the fuel-air mixture in advance, simplifying the overall device structure while achieving the desired emission reduction.
2Object-generated harmful factors
If fuel and air are mixed rapidly to reduce NOx generation, then NOx generation is reduced, but a pilot flame and ignitor are required to prevent flame blowout
Solution Approach 1:
The patent applies self-service by designing a system where the rapid mixing of fuel and air inherently stabilizes the flame without requiring external pilot flames or ignitors. The uniform pre-mixed fuel-air combination creates a stable combustion front that self-sustains, eliminating the need for additional pilot flame systems or ignitor components while maintaining rapid mixing benefits for NOx reduction.
3Manufacturing precision
If flame is formed at a position distant from the outlet, then mixing time is increased and uniform mixing is achieved, but flame stability becomes difficult to maintain
Solution Approach 1:
The patent applies preliminary action by pre-mixing fuel and air in a controlled mixing chamber before the flame formation zone. This ensures that when the mixture reaches the distant flame formation position, it is already uniformly combined, maintaining flame stability despite the extended distance from the outlet. The pre-prepared uniform mixture prevents flame instability that would otherwise occur with prolonged exposure to ambient conditions.
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 stabilizes the flame at a distance from the outlet, allowing for longer mixing time and uniform fuel-air mixing, effectively reducing NOx generation while avoiding flame blowout.
Implementation Method 1
a modifying part configured in the center to modify supplied hydrocarbon-based fuel and air and discharge high temperature modified gas including hydrogen to an outlet
Implementation Method 2
a supply part configured at an outer side of the outlet to jet fuel and air to one side of the modified gas discharged from the modifying part to form a flame at a position spaced apart by a pre-set distance from the outlet
Data Source
Figure 1
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AI summary
Combustion apparatus (1) for reducing generation of NOx by securing more time for mixing fuel and air and uniformly mixing fuel and air and including a modifying part (100) configured in the center to modify supplied hydrocarbon-based fuel and air and discharge high temperature modified gas including hydrogen to an outlet (101) and a supply part (200) configured at an outer side of the outlet (101) to jet fuel and air to one side of the modified gas discharged from the modifying part (100) to form a flame at a position spaced apart by a pre-set distance from the outlet (101).