Portable Biomass Combustor With TEG-Driven Airflow for Clean Burning
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Solution Overview
Problem
Portable combustion devices require fuel canisters, which are heavy, impractical for extended use, and pose disposal challenges, especially in emergency situations, and biomass stoves produce soot and smoke, making them undesirable for indoor use and field applications.
Innovation Solution
A portable combustion device using a thermoelectric generator (TEG) and heat sink to generate electricity and drive airflow over biomass fuels, eliminating the need for fuel canisters and external power sources, while providing cleaner combustion through directed airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel canisters are used in portable combustion devices, then the device can operate reliably, but the device becomes heavy and impractical for extended use
Solution Approach 1:
The patent extracts the fuel storage function from the combustion device by using ambient biomass fuel (leaves, twigs, grass) instead of carrying fuel canisters. The device only retains the combustion chamber and ignition mechanism, eliminating the weight of fuel containers while maintaining combustion capability through readily available natural fuels.
Solution Approach 2:
The combustion device is designed to accept various types of biomass fuel (different sizes and types of leaves, twigs, grass) rather than being limited to specific fuel canisters. This universal fuel acceptance allows the device to operate with any available biomass, making it adaptable to different environments and eliminating the need to carry multiple fuel types.
2Object-generated harmful factors
If biomass stoves are used for cleaner combustion, then soot and smoke production is reduced, but the device becomes less suitable for field use due to weight
Solution Approach 1:
The patent applies local quality by providing secondary airflow specifically to the combustion zone through perimeter ports, creating a localized oxygen-rich environment that promotes complete combustion. This targeted airflow adjustment at the combustion site reduces soot and smoke formation without requiring heavy modifications to the entire device structure.
Solution Approach 2:
The device changes the combustion parameters by introducing controlled secondary airflow through the biomass fuel bed, altering the combustion conditions from oxygen-limited (producing smoke and soot) to oxygen-sufficient (producing cleaner combustion). This parameter change achieves cleaner burning with a lightweight design.
3Duration of action of stationary object
If traditional portable combustion devices are used, then combustion can be maintained, but fuel disposal becomes problematic and complex
Solution Approach 1:
The patent uses inexpensive, biodegradable biomass fuel (leaves, twigs, grass) that can be discarded after combustion without special disposal procedures. Unlike pressurized fuel canisters that require careful handling and disposal, the biomass fuel residues can be left in the environment or used as mulch, dramatically simplifying the disposal process.
4Object-generated harmful factors
If airflow is directed over biomass fuels to improve combustion, then cleaner burning is achieved, but the device complexity increases
Solution Approach 1:
The device achieves self-service by using the heat generated from combustion itself to create natural convection currents that drive the secondary airflow through the biomass fuel bed. The hot rising gases automatically pull in cooler ambient air through the perimeter ports, eliminating the need for external fans or complex mechanical airflow control systems.
Solution Approach 2:
The patent uses pneumatic principles by relying on natural convection and pressure differentials created during combustion to drive airflow through the fuel bed. The heat-induced density differences in the gas phase create automatic airflow patterns that promote clean combustion without requiring mechanical intervention or complex control mechanisms.
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 device achieves efficient, cleaner combustion with reduced soot and smoke production, is lightweight and easy to carry, and can be used with readily available biomass fuels, enhancing usability in various situations without the need for batteries or fuel canisters.
Implementation Method 1
a voltage difference is generated between hot and cold sides of the thermoelectric generator, sufficient to power an airflow driver
Implementation Method 2
A heat sink is provided to the cold side of the thermoelectric generator
Implementation Method 3
A motorized airflow driver is electrically connected to the TEG and is arranged to draw air form an ambient source, over the heat sink and into the interface port
Implementation Method 4
combustion chamber into which a fuel source is placed for combustion
Data Source
AI summary
This invention provides a portable combustion device that provides a cleaner combustion, reduces the kindling period, and provides a more efficient overall combustion through the use of a fan that directs a predetermined volume of airflow over the combustible fuel—typically wood or similar cellulose-based biological solids. The combustion device has a combustion chamber with a fuel source. A housing encloses the TEG on the side of the device that generates an electrical output based on a temperature differential between opposing TEG sides. A heat-conducting probe is mounted to the TEG and protrudes into the combustion chamber. The opposing TEG side contacts a heat sink that interacts with ambient air. A fan draws heated air away the heat sink, and forces the air onto the combusting fuel through a plurality of peripheral ports that connect with an air space located between inner and outer walls of the combustion chamber.