Biomass-Polymer Fuel Pellets With Higher Heating Value

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Solution Overview

Problem

There is a need for densified biomass fuel materials with improved thermomechanical characteristics, such as higher heating value and better combustion properties, while addressing the challenges of low bulk density and moisture content in traditional biomass fuels.

Innovation Solution

A densified solid biomass-polymer composite is created by intimately mixing biomass with a polymer and a solvent, such as biodiesel, and then densifying the mixture using conventional equipment to produce pellets or briquettes with enhanced properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of stationary object

If biomass is densified into pellets, then bulk density is improved, but heating value and combustion characteristics deteriorate

Engineering Contradiction:

Improvebulk densityVSAvoidheating value

Core Design Contradiction:

Volume of stationary objectVSUse of energy by moving object

Solution Approach 1:

The patent creates a composite material combining biomass with thermoplastic polymer and solvent. The polymer component (1-20 wt%) and solvent (0.5-10 wt%) form a binding matrix that enhances the composite's energy density and combustion properties while maintaining the biomass's renewable characteristics. This composite approach allows achieving both high bulk density and high heating value simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the physical and chemical parameters of the biomass through densification processing. By controlling moisture content to 8 wt% or less and achieving a density of at least 40 lb/ft³, the biomass undergoes parameter changes that improve both bulk density and heating value. The densification process transforms loose biomass into compact pellets with enhanced thermomechanical properties.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If moisture content in biomass is reduced, then heating value is improved, but combustion characteristics worsen

Engineering Contradiction:

Improveheating valueVSAvoidcombustion characteristics

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The thermoplastic polymer acts as an intermediary substance that improves combustion characteristics while maintaining low moisture content. The polymer matrix provides structural integrity and consistent burn properties to the low-moisture biomass composite, ensuring reliable combustion performance despite the reduced water content that would otherwise compromise combustion stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If polymer and solvent are added to biomass, then heating value is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveheating valueVSAvoidmanufacturing complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The thermoplastic polymer and solvent system is self-service in nature, utilizing the polymer's inherent melting and binding properties during the densification process. The solvent facilitates polymer dissolution and distribution, then evaporates during processing, leaving the polymer to naturally bind the biomass particles. This self-binding mechanism eliminates the need for additional binding agents or complex processing equipment.

Inventive Principle:

Principle #25Self-service

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 resulting composite achieves a higher heating value of at least 8000 Btu/lb, reduced moisture content, and improved mechanical strength, meeting industry standards for fuel quality.

Implementation Method 1

providing a solvent that is selected to at least partially dissolve the polymer in the solvent

Methodology Applied

Scientific EffectDissolution: Solvation

Implementation Method 2

feeding the intimately mixed material to a densification unit configured to densify the intimately mixed material into a densified solid biomass-polymer composite

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS20250340737A1Densified biomass-polymer composites, and methods of making and using the same

Publication Date: 2025.11.06 BURCELL TECH INC

AI summary

The invention includes densified solid biomass-polymer composites and methods for producing the composites by introduction of a polymer, dissolved in a solvent, to a biomass material prior to densification. Some variations provide a densified solid biomass-polymer composite comprising: from 20 wt % to 98.5 wt % biomass; from 1 wt % to 20 wt % polymer; and from 0.5 wt % to 10 wt % solvent. The biomass, the polymer, and the solvent are intimately mixed together. The densified solid biomass-polymer composite has a higher heating value of at least 8000 Btu/lb. The densified solid biomass-polymer composite is suitable as a solid fuel for combustion, or as a gasification feedstock for making syngas. Methods of making and using the densified solid biomass-polymer composites are disclosed. Examples show the benefit of including a polymer, such as polystyrene, and solvent, such as biodiesel, in the densified biomass composite.