Biofuel Pellet with Variable Density for Complete Combustion
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Solution Overview
Problem
Conventional biofuel pellets burn uniformly from the outside in, leading to incomplete combustion as they decrease in size and can fall through grates, resulting in unburned material accumulating at the bottom of the firebox.
Innovation Solution
A biofuel pellet with varying densities, where the peripheral region is denser than the central region, is produced using an apparatus with pistons and crankshafts to compress biofuel precursors into a lenticular shape, preventing the pellet from slipping through grates until fully burned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform density pellets are used, then manufacturing is simpler, but combustion is incomplete and pellets fall through grates
Solution Approach 1:
The pellet is designed with non-uniform density distribution: a denser peripheral region and a less dense central region. This local quality variation ensures that the pellet maintains structural integrity through the grate while the less dense center burns more efficiently and completely.
2Use of energy by moving object
If pellets are compressed to high density, then energy content per volume increases, but pellets may slip through grates before complete combustion
Solution Approach 1:
The pellet incorporates a less dense central region that facilitates complete combustion and prevents the pellet from slipping through the grate, while the denser peripheral region maintains high energy content per volume for efficient energy delivery.
3Ease of operation
If pellets burn uniformly from outside in, then combustion process is predictable, but unburned material accumulates at firebox bottom
Solution Approach 1:
Instead of uniform outside-in combustion, the pellet is designed to burn from the less dense central region outward. This inverted combustion pattern ensures complete burning of the core material before the pellet shrinks to a size where it can slip through the grate, eliminating unburned material accumulation.
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 biofuel pellets burn efficiently, with the less dense central region combusting first and the denser peripheral region maintaining the pellet's structure, ensuring complete combustion and reducing unburned material loss.
Implementation Method 1
compressing the biofuel precursor into a first region of high density and a second region of low density to produce a pellet
Implementation Method 2
The biofuel pellets burn efficiently, with the less dense central region combusting first and the denser peripheral region maintaining the pellet's structure
Data Source
AI summary
A biofuel pellet and an apparatus for making the pellet are provided. The biofuel pellet includes a first region of high density and a second region of low density. The higher density region burns more slowly than the low density region and helps to suspend the pellet for longer and more complete combustion.