Multi-Annular Iron Particle Combustion for Self-Sustained Flame Stability
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Solution Overview
Problem
Current efforts to use metal particles like aluminum or iron as a solid fuel face scalability and sustainability challenges due to the need for continuous hydrocarbon fuel supply to sustain the flame, with existing systems limited in efficiency and scalability.
Innovation Solution
A multi-annular combustion system with distinct air flows and a cyclone separator is used to sustain a turbulent iron flame without additional hydrocarbon fuel, utilizing a primary, secondary, tertiary, and quaternary air flows, along with a divergent nozzle and swirl generator to stabilize the flame, and a cyclone for efficient recovery of oxidized iron particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat flame burner is used to stabilize the aluminum flame, then the flame is stabilized without continuous hydrocarbon fuel addition, but the scalability is limited
Solution Approach 1:
The combustion system is divided into multiple annular zones with distinct functions: inner annular space for flame stabilization, middle annular space for fuel injection, and outer annular space for air supply and swirl generation. This segmentation allows each zone to be optimized independently, achieving both reliable flame stabilization and scalability.
Solution Approach 2:
The combustion tube employs a nested structure with concentric annular spaces arranged in sequence from inner to outer regions. Each annular space is contained within the previous one, creating a compact multi-functional structure that integrates flame stabilization, fuel delivery, and air supply in a space-efficient configuration.
2Use of energy by moving object
If metal particles are used as solid fuel, then high energy density is achieved, but continuous hydrocarbon fuel supply is required to sustain the flame
Solution Approach 1:
The system uses the heat generated by the metal particle combustion itself to sustain the flame. The inner annular space captures the flame heat, and the swirl generator utilizes this thermal energy to create a self-perpetuating combustion cycle without requiring external hydrocarbon fuel addition, making the system self-sustaining.
Solution Approach 2:
The system recovers and reuses the heat energy from the combustion process. The outer annular space captures residual heat and directs it through the swirl generator, which converts this thermal energy into rotational motion to sustain the combustion cycle, thereby recovering energy that would otherwise be lost.
3Object-generated harmful factors
If iron particles are combusted, then clean combustion with minimal carbon emissions is achieved, but oxidized iron particles must be recovered for sustainability
Solution Approach 1:
The cyclone separator is positioned to extract and remove oxidized iron particles from the combustion exhaust stream. The cyclone utilizes centrifugal force generated by the swirling flow to separate the solid particles from the gas stream, efficiently recovering the oxidized iron for potential reduction and reuse.
Solution Approach 2:
The system employs pneumatic principles using the kinetic energy of the exhaust gas flow to drive the cyclone separator. The swirling exhaust stream creates a low-pressure zone that draws in oxidized iron particles, and the centrifugal force generated by the rotation separates these particles from the gas flow for efficient recovery.
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
The system achieves a self-sustained turbulent iron flame, producing high-efficiency heat capture with minimal carbon emissions, enabling recyclable and sustainable energy production with over 97% recovery of oxidized iron particles, and low NOx and nanoparticle formation.
Implementation Method 1
the first tube defining a first passage providing a primary air flow wherein the iron particles are suspended in the primary air flow
Implementation Method 2
the inner annular space further comprises an ignition point of a spark generator
Implementation Method 3
the outer annular space comprises a swirl generator and provides a tertiary air flow
Implementation Method 4
a combustion reactor, comprising a reactor outlet opposite a reactor inlet, in fluid communication and hydraulically connected with the divergent nozzle at the reactor inlet, for the generation and stabilization of a turbulent iron flame that burns the iron particles and produces oxidized iron particles
Implementation Method 5
a turbulent iron flame that burns the iron particles and produces oxidized iron particles
Implementation Method 6
a cyclone having a cyclonic inlet, a gas outlet and a particle outlet, wherein the cyclonic inlet is in fluid communication with the reactor outlet
Data Source
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AI summary
There is provided a continuous combustion system for iron particles. The system comprising a multi-annular combustion tube defining in cross-section at least three distinct passages from its inlet to its outlet. A first tube that is innermost, defines a first passage providing a primary air flow with suspended iron particles. A second tube, defines an inner annular space providing a secondary air flow, a pilot combustible flow, and an ignition point of a spark generator. A third tube defines a third passage comprises a swirl generator and provides a tertiary air flow. The tubes are nested in position within the multi-annular combustion tube. The system comprises a divergent nozzle at the outlet of the multi-annular combustion tube; a combustion reactor in fluid communication with the divergent nozzle, for the generation and stabilization of a turbulent iron flame that burns the iron particles and produces oxidized iron particles; and a cyclone.