Ash Processing Water Circuit Segmentation
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Solution Overview
Problem
Current ash processing methods from waste incineration plants face inefficiencies due to salt accumulation in water circuits, leading to frequent water replacement and contamination of coarse fractions, which restricts their usability and increases disposal costs.
Innovation Solution
Implementing a second, independent water circuit for control classification in the ash processing system, which reduces salt accumulation and prolongs water usage, allowing for more efficient recycling of the ash fractions and reducing the frequency of water exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single water circuit is used for both classification and control classification, then device complexity is reduced, but salt accumulation occurs leading to frequent water replacement and contamination of ash fractions
Solution Approach 1:
The single water circuit is divided into two separate independent water circuits: a first water circuit for classification and a second water circuit for control classification. This segmentation prevents salt accumulation in the second circuit from contaminating the ash fractions processed in the control classification stage, thereby maintaining water quality and reducing water replacement frequency.
Solution Approach 2:
The harmful effect of salt accumulation is extracted and isolated by separating the control classification water circuit from the classification water circuit. The second water circuit processes only the coarse fraction and does not come into contact with the fine fraction, allowing the system to take out the contamination problem from the overall process.
2Productivity
If water is circulated in a closed circuit for classification, then water usage efficiency is improved, but salt enrichment occurs leading to water replacement requirements
Solution Approach 1:
The closed water circulation system is segmented into two independent circuits. The first water circuit handles the bulk classification process where salt enrichment is expected, while the second water circuit handles control classification with a separate circulation loop. This allows each circuit to maintain its own water quality standards independently.
Solution Approach 2:
Different water quality requirements are applied locally to different process stages. The first classification stage tolerates higher salt concentrations, while the control classification stage maintains lower salt concentrations to ensure product quality. Each water circuit is optimized for its specific local quality requirements.
3Device complexity
If control classification is performed using water from the first water circuit, then device complexity is reduced, but the first coarse fraction becomes enriched with pollutants reducing its usability
Solution Approach 1:
The water treatment and classification processes are segmented into two independent water circuits. The second water circuit is dedicated solely to control classification of the coarse fraction, preventing cross-contamination from the first water circuit. This ensures the coarse fraction is not enriched with pollutants from the fine fraction processing water.
Solution Approach 2:
The second water circuit acts as an intermediary medium that enables control classification without direct contact between the coarse fraction and the potentially contaminated water from the first circuit. This intermediary water system protects the coarse fraction quality while still enabling the necessary classification process.
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 significantly reduces water disposal costs and maintains the quality of the ash fractions, enabling longer operation cycles and more efficient recycling of the ash, particularly for construction purposes, while minimizing environmental impact.
Implementation Method 1
the ash is classified in a first classification stage into a first coarse fraction and a fine fraction by adding water which is circulated in a first water cycle
Implementation Method 2
after sieving of a coarse fraction, is fed as a feed stream to a classification stage comprising an upflow classifier and an upstream hydrocyclone. The feed stream has a particle size distribution between 0 and 4 mm. Fine particles are separated in the hydrocyclone.
Implementation Method 3
A residual fraction with a particle size between 0 mm and 0.25 mm is drawn off as a suspension from the top of the fluidized bed generated in the upflow classifier
Data Source
Figure 1
AI summary
The invention relates to a plant and a method for processing ash from waste incineration plants, wherein: - the ash is provided, - the ash is classified in a first classification stage (3) into a first coarse fraction (5) and a fine fraction (6) by adding water, which is circulated in a first water circuit, - the first coarse fraction (5) is subjected to a control classification in a second classification stage (7) and a residual fraction (11) is separated, and wherein - the control classification is carried out by adding water, which is circulated in a second water circuit, which is independent of the first water circuit. The separation of the first and second water circuits allows the plant according to the invention to be operated more economically.