Black Pellet Composition Using Heterogeneous Steam-Cracked Biomass
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Solution Overview
Problem
Existing methods for producing steam-cracked biomass pellets face challenges in achieving good mechanical strength, water resistance, and increased calorific value, particularly when using homogeneous biomass, which often requires additives that are costly and environmentally undesirable.
Innovation Solution
A method for producing black pellets using a heterogeneous steam-cracked biomass comprising at least 50% pulverulent compounds less than 0.5 mm and 10% fibrous compounds greater than 1 mm, bound by hemicellulose and lignin, without the need for additives, achieved through controlled steam cracking and mixing of different biomass types or severity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If homogeneous biomass is used for steam cracking, then the production process is simpler, but the mechanical strength and water resistance of the resulting pellets deteriorate
Solution Approach 1:
The patent applies composite materials by combining pulverulent compounds (fine particles <0.5mm) with fibrous compounds (longer fibers >1mm) in a heterogeneous mixture. This composite approach creates pellets where the fibrous components provide structural strength and water resistance while the pulverulent components fill spaces and bind together, resolving the contradiction between simple homogeneous processing and strong water-resistant pellets.
2Ease of manufacture
If homogeneous biomass is used for steam cracking, then the processing is easier, but the calorific value of the pellets decreases
Solution Approach 1:
The patent applies local quality by creating a heterogeneous mixture where different regions contain different particle sizes and types - pulverulent compounds in some areas and fibrous compounds in others. This local variation optimizes combustion characteristics and calorific value while maintaining ease of processing through a single steam cracking step that handles both particle types.
3Strength
If additives are used to improve pellet quality, then mechanical strength and water resistance are enhanced, but production costs increase and environmental impact worsens
Solution Approach 1:
The patent applies self-service by using the biomass components themselves (hemicellulose and lignin naturally present in the heterogeneous mixture) as binding agents instead of external additives. The fibrous compounds and pulverulent compounds bind together through their natural polymers, eliminating the need for additional chemical additives and simplifying the production process while maintaining strong, water-resistant pellets.
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 method ensures the production of high-quality black pellets with improved mechanical strength, water resistance, and increased calorific value, eliminating the need for costly additives and reducing environmental impact.
Implementation Method 1
steam cracking seems technically and economically viable... This technology makes it possible to manufacture 'black pellets'... it uses a steam explosion and is done in the presence of oxygen
Implementation Method 2
Pyrolysis is the chemical decomposition of an organic compound by intense heating in the absence of oxygen
Implementation Method 3
The powder is then granulated to facilitate its transport, storage and use... the pulverulent and fibrous compounds being bound by the hemicellulose and lignin present in the biomass
Data Source
AI summary
The production of steam-cracked biomass in the form of black pellets in the field of solid biofuels. More particularly, the present disclosure relates to the production of black pellets from a heterogeneous biomass. The aim of the present disclosure is to produce black pellets having good mechanical strength, good water resistance and an increased calorific value.