Flat Flame Burner with Segmented Flow Separation for Low-NOx Combustion
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Solution Overview
Problem
Existing burners in the glass, ceramics, and metallurgical industries face challenges in reducing NOx emissions and achieving economic efficiency, particularly in supporting flameless combustion, which is necessary for favorable emissions but not effectively handled by current designs.
Innovation Solution
The burner design features flow-separated fuel and oxidizing agent feeds through the burner block, allowing combustion to occur before outlet openings, creating a broad, fanned-out flame and enabling almost laminar flow conditions for flameless combustion, with independently controllable feeds and secondary oxidizing agent supply for staged combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a burner design with diverging fuel gas flows is used to expand the flame, then the flame coverage is improved, but the refractory material of the burner block is exposed to high loads and wear
Solution Approach 1:
The burner is divided into multiple independent outlet openings arranged in rows, with fuel and oxidizing agent feeds flow-separated through the burner block. This segmentation allows the flame to be expanded across multiple points without exposing any single location of the burner block to concentrated thermal and mechanical loads, thereby protecting the refractory material while achieving broad flame coverage.
2Object-generated harmful factors
If flameless combustion is implemented to reduce NOx emissions, then emissions are improved, but existing burner designs cannot achieve this effectively
Solution Approach 1:
The burner design enables change in combustion parameters by controlling the mixing ratio of fuel and oxidizing agent, and by adjusting the flow separation characteristics. By optimizing these parameters, the burner achieves flameless combustion mode that significantly reduces NOx emissions while maintaining adaptability to different operational requirements through independent control of fuel and oxidizing agent feeds.
3Productivity
If fuel and oxidizing agent feeds are mixed before combustion, then combustion efficiency is improved, but flame geometry control and adaptability are reduced
Solution Approach 1:
The burner employs flow-separated feeds for fuel and oxidizing agent through the burner block, with multiple outlet openings that can be independently controlled. This segmentation allows precise control over the mixing process and flame geometry, enabling adaptation to different spatial conditions and metallurgical requirements while maintaining high combustion efficiency through optimized mixing at the outlet openings.
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 NOx emissions, protects the refractory burner block from wear, and enhances flexibility and economic efficiency by allowing adaptable flame geometry and impulse currents, achieving low-NOx, flameless combustion.
Implementation Method 1
Combustion only takes place in front of the outlet openings and at a distance from the burner block. The combustion processes at the various outlet openings influence each other and lead to the development of a broad, fanned-out overall flame. The combustion gases enter the combustion chamber parallel to one another and in this way also enable the production of almost laminar flow conditions, which allow flameless combustion in the combustion chamber.
Implementation Method 2
The combustion gases enter the combustion chamber parallel to one another and in this way also enable the production of almost laminar flow conditions, which allow flameless combustion in the combustion chamber.
Implementation Method 3
The conversion affects all common hearth furnaces and furnace types. The flame temperature is increased by the oxygen enrichment or the use of pure oxygen as an oxidizing agent. The associated increase in the radiation of the radiant components of the fuel gas increases the heat transfer to the product.
Implementation Method 4
The associated increase in the radiation of the radiant components of the fuel gas increases the heat transfer to the product.
Data Source
Figure 1~2
AI summary
The burner (1) has a fuel feed and has an oxidant supply for a primary oxidant. The fuel feed connected to a fuel line, extends through a burner port (4) and opens out at an outlet port in a combustion chamber. The oxidant supply connected to an oxidant line, extends through the burner port. The fuel line and the oxidant supply extend through the combustion port parallelly to each other for the primary oxidant and opens out in the combustion chamber, where oxygen is used as an oxidant. An independent claim is also included for a method for operating a burner.