Rotating Drum Biomass Reactor with Baffles and Attrition Media
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Solution Overview
Problem
There is a need for a simple and effective apparatus capable of efficient biomass pretreatment and saccharification at high dry weights, particularly for small-scale testing that mimics large commercial scale operations, and for commercially robust processes to produce high yields of fermentable sugars with low chemical usage and toxicity.
Innovation Solution
A biomass treatment system comprising a cylindrical reaction vessel with baffles and free-floating attrition media, where a processing reactant is introduced through an injection lance and distributed by rotating baffles to enhance assimilation into the biomass, allowing for pretreatment and saccharification at high biomass concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch-stirred reactor or continuous flow stirred reactor is used for biomass treatment, then mixing and treatment efficiency is improved, but device complexity and operational complexity increase
Solution Approach 1:
The patent extracts the mixing function from a complex stirred reactor system and replaces it with a simple rotating drum mechanism. The drum rotation naturally tumbles the biomass material, providing mixing and contact with treatment chemicals without requiring complex stirring mechanisms, seals, or drive systems inside the reactor vessel.
Solution Approach 2:
Instead of using a stationary reactor with moving搅拌 components (stirrers, impellers), the patent inverts the approach by using a rotating drum where the entire reactor vessel moves. This simplifies the internal reactor design while achieving effective mixing through the rotational tumbling action of the biomass load.
2Productivity
If high dry weight of biomass is processed, then productivity and sugar yield concentration is improved, but mass transfer and chemical distribution become more difficult
Solution Approach 1:
The patent applies dynamic motion to the reactor system through drum rotation, which continuously tumbles and redistributes the high-concentration biomass load. This dynamic mixing ensures uniform chemical distribution and mass transfer throughout the dense biomass matrix, overcoming the mass transfer limitations that would exist in static high-solid systems.
Solution Approach 2:
The rotating drum provides continuous mixing and chemical contact throughout the treatment process, ensuring that all biomass particles are repeatedly exposed to chemicals and that mass transfer occurs continuously rather than intermittently. This maintains effective treatment even at high biomass concentrations where diffusion paths are long.
3Ease of manufacture
If simple apparatus is used for small-scale testing, then ease of manufacture and operation is improved, but ability to mimic large-scale commercial conditions deteriorates
Solution Approach 1:
The rotating drum reactor design is universally applicable across different scales. The same basic drum rotation principle works for both small-scale laboratory testing and large-scale commercial operations, allowing results from simple apparatus to directly represent commercial-scale conditions. The geometry and operating parameters can be scaled while maintaining the same fundamental mixing and treatment mechanisms.
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 system effectively processes biomass at high dry weights, optimizing treatment conditions to achieve high yields of fermentable sugars with reduced chemical usage and toxicity, making it suitable for both small-scale testing and large commercial applications.
Implementation Method 1
rotating the baffles of the reaction vessel whereby the baffles lift and drop the attrition media
Implementation Method 2
an injection lance comprising means for delivering a processing reactant
Data Source
AI summary
A system including an apparatus is presented for treatment of biomass that allows successful biomass treatment at a high solids dry weight of biomass in the biomass mixture. The design of the system provides extensive distribution of a reactant by spreading the reactant over the biomass as the reactant is introduced through an injection lance, while the biomass is rotated using baffles. The apparatus system to provide extensive assimilation of the reactant into biomass using baffles to lift and drop the biomass, as well as attrition media which fall onto the biomass, to enhance the treatment process.