High Temperature Burner Mixing Device for NOx Reduction
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Solution Overview
Problem
Existing high-temperature burners require a specific time period to transition between operating states, which can lead to undesirable combustion in the chamber wall, hindering NOx reduction.
Innovation Solution
A high-temperature burner design with a mixing device featuring combustion air passages arranged on multiple circles, ensuring controlled combustion air distribution and fuel mixing, preventing combustion near the chamber wall during the start state and facilitating NOx-reduced combustion in the furnace space during the working state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific time period transition is used between operating states, then stable combustion is achieved, but combustion occurs near the chamber wall leading to increased NOx emissions
Solution Approach 1:
The combustion air supply is segmented into multiple passages arranged on at least two circles with different radii. The inner circle passages provide combustion air for stable combustion, while the outer circle passages provide combustion air that prevents flame contact with the chamber wall, thereby reducing NOx emissions without compromising combustion stability
Solution Approach 2:
Different regions of the mixing device provide different qualities of combustion air. The inner circle passages deliver combustion air with properties suitable for maintaining stable combustion, while the outer circle passages deliver combustion air specifically oriented to prevent wall contact and reduce NOx formation in localized areas
2Device complexity
If combustion air passages are arranged on a single circle, then device complexity is reduced, but combustion control precision is insufficient to prevent wall contact
Solution Approach 1:
The combustion air passages are arranged in multiple circular dimensions with different radii instead of a single circle. This multi-dimensional arrangement provides better combustion control precision to prevent wall contact while maintaining reasonable device complexity through the systematic geometric pattern
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 allows for stable combustion in the starting state without chamber wall contact and efficient NOx reduction by ensuring combustion occurs only in the furnace space, eliminating the need for a specific time period transition.
Implementation Method 1
a mixing device (10) arranged in the chamber (4), by means of which the combustion air supply (2) to the chamber (4) is closed off, that is to say by means of the mixing device (10) the combustion air reaches the region in the chamber (4) in which the combustion (starting operating state) resp. mixing (working operating state) takes place
Implementation Method 2
the fuel is supplied to the combustion air via a first fuel supply (3) before entering the furnace chamber (6), the resulting mixture being introduced into the furnace chamber (6)
Implementation Method 3
a mixing device arranged in the chamber, by means of which the combustion air supply to the chamber is closed off, that is to say by means of the mixing device the combustion air reaches the part of the chamber in which the combustion (start operating state) or mixing (working operating state) takes place
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The high-temperature burner according to the invention comprises, among other things, a mixing device (10) with a plurality of combustion air passages (21, 22, 23), wherein the mixing device is disc-shaped and abuts the wall of a (combustion) chamber. The combustion air passages (21, 22, 23) are arranged on the mixing device (10) such that an outer annular space of the mixing device is free of combustion air passages. The combustion air passages each have an angle of attack βx > 0° to the chamber axis and a radial swirl angle αy, wherein an angle of attack βa of the combustion air passages on the outermost ring is smaller than an angle of attack βi of the combustion air passages on the innermost ring, and wherein the swirl angle αa of the combustion air passages on the outermost ring is larger than the swirl angle αi of the combustion air passages on the innermost ring.The swirl angle αa of the combustion air passages on the outermost ring is between 5 - 60° and the combustion air passages are arranged or dimensioned such that the amount of combustion air passing through the combustion air passages increases radially outwards.