Biomass Solid Fuel Molding and Heating Process
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Solution Overview
Problem
Existing biomass solid fuels require a costly steam explosion process and often disintegrate when exposed to rain water, leading to increased Chemical Oxygen Demand (COD) in discharged water due to tar elution.
Innovation Solution
A biomass solid fuel is produced by molding pulverized biomass and heating it within specific temperature ranges, eliminating the need for steam explosion and binders, while maintaining low disintegration properties and reduced COD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steam explosion process is used to improve fuel properties, then disintegration resistance and COD reduction are achieved, but manufacturing cost increases
Solution Approach 1:
The patent changes the chemical composition parameters of the binder material to achieve the desired fuel properties without steam explosion. By selecting binder materials with specific lignin content (15-30%) and cellulose content (5-20%), the fuel achieves improved disintegration resistance and lower COD values through compositional optimization rather than expensive physical treatment processes
Solution Approach 2:
The patent replaces the expensive steam explosion process with a simple binder addition method using readily available agricultural waste materials as binders. This substitution uses inexpensive, easily obtainable materials (straw, husk, sawdust) to achieve the same functional outcomes at significantly lower cost
2Object-generated harmful factors
If steam explosion process is used to reduce COD, then discharged water quality improves, but manufacturing cost increases
Solution Approach 1:
The patent reduces COD in discharged water by changing the chemical composition of the fuel through controlled binder addition. The specific formulation (binder at 5-20% of total weight with controlled lignin and cellulose content) limits the elution of organic substances during water exposure, achieving COD reduction without requiring the costly steam explosion treatment
3Reliability
If binder is added to improve fuel integrity, then disintegration resistance improves, but manufacturing complexity increases
Solution Approach 1:
The patent uses simple, readily available agricultural waste materials as binders (straw, husk, sawdust) that can be directly mixed with pulverized biomass without requiring complex processing. These inexpensive materials provide sufficient binding functionality through their natural composition, particularly lignin content, eliminating the need for sophisticated binder application systems
Solution Approach 2:
The patent achieves uniform fuel properties by ensuring homogeneous distribution of the binder material throughout the pulverized biomass. The binder is mixed in controlled amounts (5-20% of total weight) to create a uniform composition that provides consistent binding across the entire fuel product, simplifying the manufacturing process while maintaining fuel integrity
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 process results in a biomass solid fuel with improved handleability and reduced COD in discharged water, achieved without the cost and binder requirements of steam explosion, maintaining fuel integrity and environmental impact.
Implementation Method 1
a molding step of molding pulverized biomass, and a heating step of heating the molded pulverized biomass
Data Source
AI summary
A biomass solid fuel is provided which, when exposed to rain water, has a reduced COD in discharged water and has low disintegration-property, while suppressing an increase in cost. The present invention relates to a biomass solid fuel obtained by molding pulverized biomass, having a fuel ratio (fixed carbon/volatile matter) of 0.2 to 0.8, dry-basis higher heating value of 4800 to 7000 (kcal/kg), a molar ratio of oxygen O to carbon C (O/C) of 0.1 to 0.7, and a molar ratio of hydrogen H to carbon C (H/C) is 0.8 to 1.3.