Fly Ash Carbon Extraction via Electrostatic Separation
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Solution Overview
Problem
Existing methods for extracting carbon from fly ash, such as those using electrostatic devices, are inefficient when dealing with wet ash, consume excessive energy, and result in carbon extraction across all granulometry levels, leading to reduced efficacy.
Innovation Solution
A method involving granulometric separation of fly ash into coarse and fine fractions, followed by electrostatic carbon extraction solely on the coarse fraction, with subsequent drying and cooling steps to optimize carbon removal, utilizing a plant with a granulometric separator, electrostatic separator, and grinder to achieve targeted carbon reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrostatic device is used to extract carbon from wet fly ash, then carbon extraction is performed, but energy consumption increases significantly and extraction efficacy decreases
Solution Approach 1:
The patent applies preliminary drying of fly ash before electrostatic carbon extraction. By removing moisture content to below 10% (preferably below 5%) before the electrostatic separation process, the ash becomes more suitable for effective carbon extraction with reduced energy consumption and improved extraction efficacy.
Solution Approach 2:
The patent segments the fly ash processing into distinct stages: drying phase followed by electrostatic separation phase. This segmentation allows optimization of each stage independently, ensuring moisture is removed before carbon extraction to maximize efficacy and minimize energy use.
2Quantity of substance
If electrostatic device extracts carbon from entire fly ash regardless of granularity, then carbon extraction is performed, but extraction efficacy is reduced
Solution Approach 1:
The patent applies local quality by treating different granulometric fractions of fly ash differently. Coarse fractions (particles larger than 45 micrometers) are subjected to electrostatic carbon extraction, while fine fractions are processed separately or excluded. This targeted approach improves extraction efficacy since carbon particles are predominantly associated with coarse fractions.
3Ease of manufacture
If fly ash with high carbon concentration is used directly in cement production, then processing cost is reduced, but cement quality degrades and concrete turns black
Solution Approach 1:
The patent extracts harmful carbon particles from fly ash through electrostatic separation after drying. By removing carbon content to below 5% (preferably below 3%), the fly ash becomes suitable for cement and concrete applications, eliminating the black discoloration and quality degradation while maintaining cost-effectiveness compared to producing pure cement.
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 enhances carbon extraction efficacy, reduces energy consumption, and ensures the treated ash meets the requirements of the cement and concrete industry while minimizing environmental impact.
Implementation Method 1
a step of extracting carbon from the ash, a method wherein the extraction step is subsequent to the separation step, said extraction step being implemented solely on the coarse fraction, by electrostatic separation
Implementation Method 2
a step of drying the ash during which the temperature of said ash is above 60° C.
Data Source
AI summary
Disclosed is a method for treating fly ash containing an initial carbon concentration to obtain ash containing a predetermined final carbon concentration less than the initial concentration, the method including: —a step of granulometric separation of the ash into at least two fractions, a coarse traction and a fine fraction, the coarse fraction having a granulometry greater than the fine fraction; —a step of extracting carbon from the ash; a method wherein the extraction step is subsequent to the separation step, the extraction step being implemented solely on the coarse fraction, by electrostatic separation, the method including a step of drying the ash during which the temperature of the ash is above 60° C.