Biomass-Derived Graphite Blocks for Low-Cost High-Temperature Insulation
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Solution Overview
Problem
Existing high-temperature insulation materials are costly and require non-renewable starting materials, and their production processes are complex and costly.
Innovation Solution
A process using inexpensive and renewable raw materials like leaves, moss, sawdust, and used paper, mixed with a binder, is softened, comminuted, and graphitized at high temperature to produce graphite components with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional high-temperature insulation materials are used, then thermal insulation performance is achieved, but production costs are high and raw materials are non-renewable
Solution Approach 1:
The patent transforms organic materials through controlled thermal parameter changes (carbonization at 500-1500°C, graphitization at 2000-3000°C) to convert low-cost renewable biomass into high-performance graphite insulation materials, achieving both cost reduction and performance maintenance
Solution Approach 2:
The patent creates composite graphite materials by combining carbonized organic materials with binders and additives, producing composite blocks that maintain excellent thermal insulation properties while using inexpensive renewable raw materials like wood chips, bark, and agricultural waste
2Reliability
If conventional graphite production processes are used, then graphite quality is achieved, but the production process is complex and costly
Solution Approach 1:
The patent divides the production process into distinct sequential stages (carbonization, binding, sintering, graphitization), allowing each stage to be optimized independently and simplifying the overall complex process through systematic segmentation of operations
Solution Approach 2:
The patent performs preliminary carbonization of organic materials before final graphitization, pre-converting biomass to carbon-rich material that requires less energy and time for final graphite transformation, thereby simplifying and reducing the complexity of the main graphitization process
3Ease of manufacture
If renewable raw materials are used, then cost and sustainability are improved, but material consistency and processing difficulty increase
Solution Approach 1:
The patent applies different processing conditions to different material components during carbonization and graphitization, accounting for variations in lignin, cellulose, and hemicellulose content in different biomass sources, thereby achieving consistent graphite quality from variable renewable raw materials
Solution Approach 2:
The patent uses binders and additives as intermediary materials that standardize and homogenize the mixture of varying biomass materials, ensuring consistent processing behavior and final product quality regardless of raw material source variations
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
Produces cost-effective graphite components suitable for high-temperature insulation and filtration, using simple and efficient production methods.
Implementation Method 1
the mixture is then softened over a prolonged period with a solvent
Implementation Method 2
the solvent is largely removed by pressing the mixture until the resultant briquet has sufficient stability and a sufficiently low solvent level
Implementation Method 3
the briquet is graphitized to a block in a high-temperature furnace in an oxygen-free atmosphere under protective gas or under reduced pressure at a temperature of >2000° C.
Implementation Method 4
the briquet is dried until the residual solvent has evaporated
Data Source
AI summary
A method for producing graphite for use as a high-temperature insulation material or as a filter in the form of cubes, sheets or other components includes: producing a base material in the form of a mixture of carbon-based materials containing a raw material selected from foliage, moss or similar materials, such as grass, corn leaves or even sawdust, waste paper or natural fibres; soaking the mixture in a solvent over an extended period of time and comminuting it; adding a binder to the mixture until a largely homogeneous paste-like mixture is obtained; largely removing the solvent by pressing the mixture until a sufficiently stable and low-solvent pressed article is obtained; drying the pressed article until the remaining solvent has evaporated; and graphitising the pressed article to produce a block in a high-temperature furnace in an oxygen-free atmosphere, under inert gas, or in a vacuum at a temperature of >2,000° C.