Mass Flow Biomass Torrefaction Reactor Design
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Solution Overview
Problem
Existing biomass torrefaction systems require mechanical devices to move biomass or hot gases, leading to large, complex equipment with high energy consumption and potential leakage, and are limited by long residence times, making scale-up difficult.
Innovation Solution
A torrefaction system using a reactor with mass flow characteristics, eliminating the need for mechanical flow aids, achieving uniform biomass flow and residence time, with controlled gas temperature and flow rate to optimize the torrefaction reaction, and incorporating a heated gas input and discharge system to manage the process efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical devices are used to move biomass or hot gases, then biomass flow and gas circulation can be achieved, but equipment size increases, energy consumption increases, and device complexity increases
Solution Approach 1:
The patent replaces mechanical devices (conveyors, fans, pumps) with a fluidized bed system where hot gases fluidize the biomass particles, causing them to move and circulate automatically through the reactor. The gas flow itself becomes the driving force for biomass movement, eliminating the need for separate mechanical conveyance systems.
Solution Approach 2:
The patent uses pneumatic principles by introducing hot gases at controlled velocities to fluidize and transport biomass particles through the reactor. The gas flow rate and velocity are adjusted to achieve desired biomass circulation patterns without mechanical intervention.
2Ease of operation
If mechanical devices are used to move biomass or hot gases, then biomass flow can be maintained, but energy consumption increases
Solution Approach 1:
The patent replaces energy-intensive mechanical conveyors with a gas-fluidized system where the thermal energy already required for torrefaction is also used to fluidize and move the biomass. The hot gases serve dual purposes: heating the biomass and transporting it through the reactor.
Solution Approach 2:
The hot gas stream performs multiple functions simultaneously: it provides thermal energy for torrefaction, fluidizes the biomass particles to enable movement, and circulates the biomass through the reactor. This multi-functionality eliminates the need for separate energy inputs for biomass transport.
3Productivity
If mechanical devices are used to move biomass, then biomass circulation is achieved, but equipment size and horsepower requirements increase
Solution Approach 1:
The patent eliminates horsepower-intensive mechanical conveyors by using gas flow to fluidize and transport biomass particles. The power required is the thermal energy in the hot gases, not mechanical shaft power, significantly reducing the horsepower requirements of the system.
4Reliability
If long residence time is used for torrefaction, then complete torrefaction reaction is achieved, but scale-up is limited and equipment size increases
Solution Approach 1:
The patent uses a dynamic fluidized bed system where biomass particles are continuously suspended and moved by gas flow, ensuring all particles are exposed to hot gases uniformly. This dynamic mixing and circulation achieves complete torrefaction in a shorter residence time compared to static systems, allowing for more compact reactor design.
Solution Approach 2:
The fluidized bed system creates multiple contact points between biomass particles and hot gases simultaneously, effectively multiplying the heat transfer and reaction surface area. This allows for faster reaction rates and shorter residence times while maintaining complete torrefaction.
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 approach reduces energy requirements, minimizes equipment size, and ensures consistent torrefaction of biomass, producing a high-quality, uniform product with controlled residence time and low pressure drop, addressing the limitations of previous systems.
Implementation Method 1
subjecting a raw particulate biomass to an elevated temperature sufficient to bring about torrefaction of the biomass
Implementation Method 2
process for the production of torrefied biomass by subjecting a raw particulate biomass to an elevated temperature sufficient to bring about torrefaction of the biomass
Data Source
AI summary
A system and method are described for torrefaction of particulate biomass. The system comprises a reactor having mass flow characteristics, containing particulate biomass, and further is equipped with a heated gas input; a gas discharge output; a particulate solids inlet; and a particulate solids discharge.