Charcoal Production Reactor with Gas Circulation for Heat Transfer
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Solution Overview
Problem
Current charcoal production technologies are not economically viable due to high production costs and limited scalability, flexibility, and energy efficiency, particularly when using low-grade lignocellulosic materials like wood chips or waste, which also results in suboptimal charcoal quality and yield.
Innovation Solution
An apparatus and process that includes additional gas inlets and outlets in the reaction chamber to control pyroligneous vapour and heat flow, allowing for improved temperature control, increased charcoal yield, and energy efficiency, with an autogenous carbonisation process that utilizes inert gases to manage the reaction zones and recover heat, enhancing the production of charcoal from wood chips or waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wood chips or waste are used as raw material, then production cost decreases and economic viability improves, but heat transfer to the core of large mass material becomes slow due to low gas permeability and low thermal conductivity
Solution Approach 1:
The reactor is divided into multiple zones (heating zone, carbonisation zone, cooling zone) with different functional characteristics. This segmentation allows optimized heat transfer in each zone while processing wood chips of varying sizes, resolving the contradiction between using low-cost wood chips and achieving efficient heat transfer.
Solution Approach 2:
A gas circulation system acts as an intermediary to enhance heat transfer. Gas is introduced to circulate through the material bed, facilitating heat and mass transfer from the surface to the core of wood chips, thereby improving heat transfer efficiency without changing the raw material type.
2Productivity
If residence time in reactor is reduced, then productivity increases, but heat transfer efficiency deteriorates for large mass material
Solution Approach 1:
A gas circulation system is introduced to enhance heat and mass transfer within the reactor. Gas flow facilitates rapid heat transfer to the core of wood chips, enabling reduced residence times while maintaining heat transfer efficiency. The gas circulation creates dynamic conditions that prevent heat accumulation delays.
3Use of energy by moving object
If external heating or hot gas blowing is used, then heating efficiency improves, but process complexity and operational cost increase
Solution Approach 1:
The system utilizes the exothermic heat generated during the carbonisation process itself to maintain and enhance heating efficiency. The heat from the carbonisation reaction is captured and used to preheat incoming wood chips and maintain temperature in the heating zone, creating a self-sustaining thermal system that reduces external energy input requirements.
Solution Approach 2:
Heat that would otherwise be lost or require external input is recovered and reused within the system. The exothermic heat from carbonisation is recovered to preheat feedstock and maintain reactor temperature, thereby improving heating efficiency while reducing the need for complex external heating systems.
4Productivity
If charcoal production scale is increased, then productivity improves, but capital costs and maintenance costs increase
Solution Approach 1:
The reactor is designed to handle multiple types of lignocellulosic materials (wood chips, sawdust, agricultural waste) with flexible feedstock preparation systems. This universality allows the same equipment to process various low-cost raw materials, improving productivity while keeping capital costs manageable through versatile design rather than specialized high-cost equipment for specific materials.
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 solution enables more flexible and controllable charcoal production, increasing energy efficiency, charcoal yield, and the quality of liquid products, while reducing the residence time and operational costs, making charcoal production more competitive with coal prices.
Implementation Method 1
thermal decomposition of the organic material to produce charcoal, pyroligneous vapours and non-condensable gases
Implementation Method 2
autogenous carbonisation process wherein the decomposition process is a carbonisation process that progresses as the organic raw material advances from the entrance to the exit of the reaction vessel
Implementation Method 3
control pyroligneous vapour and heat flow
Implementation Method 4
utilizes inert gases to manage the reaction zones and recover heat
Implementation Method 5
recover heat, enhancing the production of charcoal
Data Source
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AI summary
The invention relates to an apparatus and a method for the production of charcoal from wood chops or other particulate organic waste material. The quality of charcoal produced is suitable for use in applications such as chemical reagents, fuels, and as absorbents. The reaction vessel defines a flow path extending from the input to the vessel, through to the output from the vessel, in which the thermal decomposition of the organic material progresses as the organic material passes through the reaction vessel. The vessel includes a reaction zone for autogenous reaction of organic material in a reaction bed of the organic material, and a cooling zone having at least one inlet for supplying cooling gas into the reaction bed and an outlet to extract heated gas from the reaction bed.