Continuous Lignocellulosic Carbonization via Fluidized Bed
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Solution Overview
Problem
Current methods lack an efficient process for carbonizing lignocellulosic materials into powder form, which is essential for producing carbonized particles or agglomerates quickly and effectively.
Innovation Solution
A continuous or semi-continuous method involving drying and milling lignocellulosic materials into a powder, suspending them in an inert gas medium, and thermally treating them in a furnace at temperatures between 900°C to 1800°C to produce carbonized particles or agglomerates, which can be used as carbon powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lignocellulosic material is carbonized using conventional methods, then carbonization can be achieved, but the process is inefficient and time-consuming
Solution Approach 1:
The lignocellulosic material is divided into fine powdery particles, increasing the surface area to volume ratio. This segmentation allows for more efficient heat transfer and faster carbonization reactions, directly improving productivity while reducing the time required for complete carbonization.
Solution Approach 2:
The patent uses a fluidized bed reactor where inert gas flows upward through the powder bed, suspending the particles and enhancing heat and mass transfer. This pneumatic approach enables rapid and uniform carbonization, significantly improving process efficiency and reducing carbonization time compared to conventional batch methods.
2Productivity
If lignocellulosic material is processed as fine particles to increase surface area, then carbonization efficiency improves, but particle aggregation occurs
Solution Approach 1:
The fluidized bed system uses controlled gas flow to keep particles suspended and dispersed throughout the reactor. The upward gas flow counteracts gravity and prevents aggregation, maintaining stable particle dispersion while enabling efficient carbonization. This pneumatic approach simultaneously addresses both productivity improvement and dispersion stability.
Solution Approach 2:
An inert gas atmosphere is used to prevent oxidation and unwanted reactions during carbonization. The inert environment also helps maintain particle dispersion by providing a controlled medium that reduces inter-particle adhesion, thereby stabilizing the particle composition during the high-temperature process.
3Productivity
If continuous processing is implemented to improve productivity, then carbonization speed increases, but process complexity increases
Solution Approach 1:
The fluidized bed reactor provides a continuous processing mode where powder is fed continuously at the bottom and carbonized particles are discharged at the top. The pneumatic system automatically maintains fluidization and particle suspension, enabling continuous operation without requiring complex mechanical moving parts, thus improving productivity while keeping the device relatively simple.
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
This method enables complete carbonization of gas-suspended particulate biomass in a significantly reduced time, producing carbonized particles with high elemental carbon content, suitable for various applications such as water treatment, air purification, and rubber reinforcement, while serving as a substitute for carbon black.
Implementation Method 1
suspending and/or diluting said raw material in a fluidic medium, wherein the fluidic medium is an inert gas or an inert gas mixture
Implementation Method 2
conveying the raw material in the fluidic medium into and through a hot chamber
Implementation Method 3
carbonization comprises conveying the raw material in the fluidic medium into and through a hot chamber, preferably a furnace system, and continuously thermally treating the raw material in the fluidic medium, at a temperature range of from 900 to 1800 °C
Data Source
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AI summary
The present invention provides a novel cost efficient method for carbonizing lignocellulosic material to carbonized particles or agglomerates, preferably carbon powder. Also uses of said particles or agglomerates are disclosed.