Jet cavity catalytic heater
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Solution Overview
Problem
Conventional burners that mix fuel and air together for combustion within a cavity often result in unsteady and explosive burns, leading to potential disasters such as burner rupture, especially when dealing with hydrocarbon fuels like kerosene, and incomplete combustion due to non-uniform flow distribution in catalytic beds.
Innovation Solution
A catalytic heater design featuring separate diffusion of fuel and air through a porous catalytic bed, where fuel vaporizes and inter-diffuses with oxygen within the catalytic bed cavity, achieving complete combustion and eliminating gases like hydrocarbons and carbon monoxide, without the need for fans or pumps, using convection air flow and jets for fuel or air admission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel and air are mixed together for combustion within a cavity, then combustion can occur, but unsteady and explosive burns result leading to potential burner rupture
Solution Approach 1:
The patent divides the combustion process into two separate diffusion paths: fuel diffuses through porous walls from the interior cavity, while air diffuses through the same porous walls from the exterior. This segmentation prevents premature mixing of fuel and air, eliminating explosive risks while maintaining reliable combustion at the porous surface.
Solution Approach 2:
The porous catalytic bed acts as an intermediary structure that mediates the interaction between fuel and air. It allows controlled diffusion of both substances while providing a large surface area for catalytic combustion, preventing unsteady explosive burns and ensuring stable combustion.
2Loss of energy
If fuel and air are inter-diffused through a porous catalytic bed, then complete combustion is achieved, but the device complexity increases
Solution Approach 1:
The patent employs a porous catalytic bed as the core component, which provides both structural function and catalytic activity. The porous structure enables simultaneous diffusion of fuel and air while offering extensive surface area for combustion, achieving complete combustion without requiring additional complex mixing or delivery systems.
Solution Approach 2:
The porous catalytic bed performs multiple functions simultaneously: it serves as a diffusion barrier, a catalytic reactor, and a heat transfer medium. This multi-functionality achieves complete combustion while avoiding the need for separate components for each function, thereby limiting the increase in device complexity.
3Loss of energy
If conventional burners mix fuel and air for combustion, then combustion occurs, but unburned combustion products remain due to non-uniform flow distribution
Solution Approach 1:
The porous catalytic bed provides locally optimized combustion conditions across its entire surface area. Each point on the porous structure offers uniform catalytic activity and diffusion characteristics, ensuring complete combustion of fuel molecules that contact the surface and eliminating unburned combustion products.
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 ensures complete combustion with reduced unburned combustion products, eliminates explosive risks, and achieves high combustion efficiency, with measurements showing better than 99.984% efficiency in combusting methanol, while maintaining a robust and quiet operation.
Implementation Method 1
Oxidation occurs on the porous catalytic wall between oxidizer molecules diffusing from outside the porous catalytic wall and a plasma within the cavity diffusing towards the porous catalytic wall
Implementation Method 2
catalytic combustion with fuel from the one or more porous tubes. Oxidation occurs on the porous catalytic wall
Implementation Method 3
The plasma is formed from vaporized fuel released via the one or more porous tubes
Implementation Method 4
achieve catalytic combustion with fuel from the one or more porous tubes. Oxidation occurs on the porous catalytic wall between oxidizer molecules diffusing from outside the porous catalytic wall and a plasma within the cavity diffusing towards the porous catalytic wall, such that the oxidation generates heat
Data Source
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AI summary
The present invention is a method of delivering vaporized alcohol fuel through a thermally conductive porous nozzle to a catalytic burner with a plasma cavity and a surrounding porous catalytic cavity with fuel vapor and air supplied separately and inter diffusing into each other from different routes to the catalyst to achieve an efficient, steady, and complete combustion of the hydrogen bearing fuels. This heating system with passive auto thermostatic behavior, coupled to thermopiles, heat pipes and fluid heating systems may provide useful heat and electricity to applications of floors, roadways, runways, electronics, refrigerators, machinery, automobiles, structures, and fuel cells.