Rotary Burner Ring Adjusts Radial Air Injection Angle
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Solution Overview
Problem
Rotary kiln burners face inefficiencies due to pressure drops and reduced expansion speed of primary air, leading to suboptimal combustion and increased NOx emissions, particularly when adjusting the radial component of the primary air, which affects flame control and energy balance.
Innovation Solution
A burner design featuring a primary air or gas pipe with a movable ring and axial protrusions forming channels of different angles, allowing for adjustable radial air injection without pressure drops, maximizing expansion speed and maintaining pulse while controlling flame diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure drop is reduced to maintain primary air expansion speed, then combustion efficiency is improved, but flame shape control becomes difficult
Solution Approach 1:
The primary air outlet is segmented into multiple independent nozzles with different orientations (axial and radial components). Each nozzle can be independently adjusted to control the flame shape while maintaining overall high expansion speed and minimizing pressure drops.
Solution Approach 2:
The burner incorporates adjustable components that allow dynamic modification of the radial air component while maintaining optimal pressure conditions. This enables real-time flame shape control without sacrificing combustion efficiency or expansion speed.
2Ease of operation
If radial air component is increased to control flame diameter, then flame control is improved, but pressure drops and expansion speed are reduced
Solution Approach 1:
Different sections of the primary air outlet have specialized functions: axial nozzles provide the main expansion velocity while radial nozzles provide localized diameter control. This local differentiation allows flame diameter adjustment without significantly impacting overall expansion speed.
Solution Approach 2:
The burner uses asymmetric nozzle arrangements with different orientations (axial vs. radial) to independently control flame characteristics. The axial component maintains expansion speed while the radial component controls diameter, creating an asymmetric but optimized flow pattern.
3Productivity
If primary air pressure is increased to maintain pulse, then combustion performance is improved, but energy consumption increases
Solution Approach 1:
Instead of uniformly increasing pressure across all air components, the invention applies pressure optimization selectively to the axial nozzles that provide the main expansion velocity, while using the radial nozzles for control functions at lower pressure, thus reducing overall energy consumption.
Solution Approach 2:
The system optimizes pressure parameters by maintaining high pressure only where needed for expansion velocity (axial component) while allowing lower pressure for the radial control component, thereby improving combustion performance without proportionally increasing energy consumption.
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 enhances combustion efficiency by maximizing primary air expansion speed, reducing NOx emissions, and protecting refractory linings by ensuring precise flame control and stable operation.
Implementation Method 1
a ring movable in rotation and having axial protrusions constituting distributors which cooperate with the primary air or radial gas injection ducts arranged at the end of the burner on the outer peripheral part of the inner wall and form two channels of different angles in each primary air or radial gas injection duct
Implementation Method 2
this primary air is injected at the end of the burner, at high pressure (between 100 and 500 mbar) and at high speed (between 80 and 350 m / s) in order to: Suck in the air secondary hot at the heart of the flame and ensure its rapid mixing with the burner fuel
Implementation Method 3
The rotation of the crown will allow the section of the primary air or radial gas ducts to be divided into two series of interposed channels. A first series of channels has a small radial primary air injection angle while the other series has a radial primary air injection angle more important than the previous series
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The present invention relates to a burner (1) that comprises a conduit for primary air or gas delimited by an outer wall and a concentric inner wall of axis X and conduits (21) for injecting radial primary air or gas, said burner being characterised in that the air or gas conduit (22) comprises a ring (3) rotatably mobile and having axial protrusions constituting distributors (30) that engage with the radial primary air conduits (21) disposed on the inner wall and form two channels (210, 211) of different angles in each conduit (21). The rotation of the ring (3) makes it possible to vary the injection angle of the radial primary air. Therefore, the adjustment is located just at the end of the burner (1), at the outlet of primary air into the furnace, by modifying the outlet angle of the radial component having a fixed cross-section, which greatly simplifies the adjustment of the burner (1). This avoids bringing into rotation mobile parts that are in direct contact with the outside of the burner and therefore subject to very high thermal stress with a risk of damage to said parts.