Flue Gas Nozzle Wave Path for Uniform Burnout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing combustion systems in furnaces struggle to maintain uniform flue gas distribution and dwell time, leading to inefficient mixing and burnout, particularly due to turbulence causing some gases to flow quickly while others remain for a long time, resulting in inconsistent burnout and emission control.
Innovation Solution
The method involves arranging nozzles to guide flue gases on a wavy path within the flue, adjusting pressure, volume flow, and nozzle design to ensure all particles have a longer, uniform dwell time, and varying the distribution of combustion air to optimize burnout and emission control, while maintaining a constant combustion air ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If nozzles are used to create turbulence for mixing flue gas with secondary air, then mixing intensity is improved, but flue gas particles have inconsistent residence times with some flowing quickly and others remaining for long periods
Solution Approach 1:
The patent applies curvature by guiding flue gas through a wave-like path instead of straight flow. The flue gas is directed to flow in undulating waves through the combustion chamber, following a curved trajectory that ensures all particles traverse a similar path length and residence time, eliminating the variability caused by turbulent straight-line flow patterns
Solution Approach 2:
The patent changes the flow pattern parameter from turbulent random motion to controlled wave-like laminar flow. By adjusting the flow regime and guiding mechanism, the system transforms the unpredictable residence times of turbulent flow into consistent, uniform residence times for all flue gas particles
2Productivity
If straight flow path is used in flue gas passage, then residence time is reduced, but uniform treatment of all flue gas particles is achieved
Solution Approach 1:
The wave-like curved path increases the effective flow path length within the combustion chamber without increasing the physical chamber dimensions. This extended path ensures all flue gas particles remain in the combustion zone longer, improving burnout efficiency while maintaining uniform residence times through the guided wave pattern
3Stability of the object's composition
If turbulence is created to mix flue gas with secondary air, then mixing is intensified, but some particles flow through quickly while others remain for very long times
Solution Approach 1:
The wave-like flow path creates controlled mixing through the undulating motion rather than turbulence. As flue gas flows in waves, it naturally mixes with secondary air along the curved path while all particles follow similar trajectories, achieving homogeneous mixing without the residence time variability characteristic of turbulent flow
Solution Approach 2:
The patent replaces the mechanical turbulence-based mixing system with a wave-guided flow system. Instead of relying on chaotic turbulent eddies for mixing, the system uses controlled wave motion to achieve both mixing and uniform residence times through the structured flow 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 approach ensures reproducible, uniform treatment of flue gases, preventing straight flow and optimizing burnout by extending dwell time and maintaining consistent combustion efficiency, thereby improving burnout and reducing emissions like NOx, CO, and O2.
Implementation Method 1
flue gas passage having nozzles on opposite sides for injecting a fluid into the flue gas
Implementation Method 2
the flue gases flow through the injected fluid on a wave-like line, thereby increasing the residence time within the flue gas passage
Implementation Method 3
The addition of fluids in the secondary combustion zone serves to swirl the flue gases and is intended to achieve a homogeneous mixing of the flue gas and the secondary air added via the nozzles
Implementation Method 4
This is possible because hot flue gases have a viscous consistency and can therefore be guided along a path through the nozzles
Implementation Method 5
A liquid can also be added as the fluid, which usually evaporates upon entering the flue gas passage
Data Source
Figure 1~2
AI summary
A specific distribution and orientation of the nozzles in the flue gas passage allows the flue gas to be guided along a wave-like path. The supply of combustion air, distributed between primary and secondary air, can be varied during operation of the combustion system to, for example, maintain a constant combustion air ratio and thus also a constant burn rate.