High Shear Reactor for Coal Impurity Extraction
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Solution Overview
Problem
Current coal desulfurization and de-ashing technologies are inefficient in removing impurities from the deeper core of coal particles, limiting the effectiveness of the process and requiring additional steps to achieve compliant coal, while also generating hazardous ash residue and sulfur emissions that pose environmental and economic challenges.
Innovation Solution
A method using a high shear reactor with activation agents such as solvents and oxidants to break apart coal particles and extract impurities like sulfur and heavy metals, employing oxidative desulfurization and liquid-liquid extraction to produce a clean, high-caloric-value coal product, with the reactor's high shearing forces and cavitation enhancing contaminant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional desulfurization and de-ashing technologies are used, then the process is simple and easy to operate, but the removal of impurities from the deeper core of coal particles is inefficient
Solution Approach 1:
The coal particles are segmented into smaller size ranges (0.5-2mm, 0.2-0.5mm, 0.1-0.2mm) through multi-stage grinding, increasing the surface area and allowing treatment agents to penetrate deeper into the coal matrix, thereby improving impurity removal effectiveness from the core of particles
Solution Approach 2:
Chemical treatment agents (oxidizing agents, chelating agents, surfactants) are introduced as intermediaries to facilitate the removal of sulfur and ash impurities from within the coal particles. These agents penetrate the coal matrix and chemically react with or bind to impurities, enabling their extraction without requiring direct mechanical removal of the entire particle structure
2Manufacturing precision
If additional processing steps are added to achieve compliant coal, then impurity removal effectiveness improves, but operational costs increase
Solution Approach 1:
Multiple treatment functions (grinding, chemical oxidation, chelation, surfactant action, and filtration) are merged into a single integrated continuous processing system. The coal slurry flows sequentially through different treatment zones in one continuous operation, achieving comprehensive impurity removal without requiring separate batch processing steps, thereby maintaining operational efficiency
Solution Approach 2:
The coal is ground to fine particle sizes and converted to slurry form before chemical treatment, preliminarily preparing the material to enhance penetration of treatment agents. This preliminary size reduction and slurry formation enables more effective subsequent chemical processing, reducing the need for multiple repeated treatment cycles
3Use of energy by moving object
If coal is burned directly, then energy production is immediate, but substantial ash residue is generated with negative heating value
Solution Approach 1:
Sulfur, ash, and heavy metal impurities are extracted and removed from the coal matrix through chemical treatment agents that specifically target and bind to these contaminants. The treated coal is then filtered and separated, producing a cleaned fuel product with significantly reduced ash content (reducing harmful emissions) while preserving the energy-containing carbon structure of the coal
Solution Approach 2:
The chemical and physical parameters of the coal are changed through treatment - sulfur content is reduced through oxidation and chelation, ash content is reduced through surfactant-based separation, and heavy metals are removed through chelating agents. These parameter changes transform the coal from a high-impurity fuel to a low-impurity clean fuel with improved combustion characteristics and reduced harmful emissions
4Use of energy by moving object
If ash residue accumulates in ash pits, then energy production continues, but environmental hazards increase requiring expensive disposal plans
Solution Approach 1:
The impurities that would otherwise become harmful ash residue are converted into removable contaminants through chemical treatment. Sulfur is oxidized to water-soluble forms, heavy metals are chelated into soluble complexes, and ash particles are coated with surfactants for easy separation. This transforms the harmful accumulation problem into a manageable filtration and separation process, producing clean fuel and concentrated impurity streams that can be disposed of more efficiently
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 effectively reduces sulfur content and other impurities in coal, producing a cleaner fuel with higher caloric value, reducing environmental hazards and operational costs by simultaneously penetrating the coal matrix and removing impurities, including valuable metals, which can be further processed for additional revenue.
Implementation Method 1
The high shear reactor (e.g., spinning disk, high shear, or other and/or including hydrodynamic cavitation reactor) produces forces to break apart the coal
Implementation Method 2
spinning disk, high shear, or other and/or including hydrodynamic cavitation reactor
Implementation Method 3
employing oxidative desulfurization and liquid-liquid extraction to produce a clean, high-caloric-value coal product
Implementation Method 4
A method using a high shear reactor with activation agents such as solvents and oxidants
Implementation Method 5
employing oxidative desulfurization and liquid-liquid extraction to produce a clean, high-caloric-value coal product
Data Source
AI summary
A method of processing raw coal using activation agents (e.g., solvents and extractants) in a high shear reactor, which creates high shearing forces to break apart the coal and selectively extract and remove contaminants such as ash, sulfur, and other heavy metal impurities resulting in clean, high caloric-value coal.