Moist MSWI Ash Particle Liberation via Impact Striking
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Solution Overview
Problem
The existing methods for processing Municipal Solid Waste Incinerator ash (MSWI ash) are inefficient in separating particles of different dimensions due to the formation of clumps caused by moisture and fines, making it difficult to recycle and reuse, especially in ash compositions that differ from European standards, such as those found in the United States.
Innovation Solution
A method and apparatus that involves feeding the moist MSWI ash into a particle stream, striking it with a striking body to break up clumps, and receiving the particles on a moving surface to separate them into distinct size fractions, allowing for the liberation of particles and subsequent classification, which can be further processed using conventional screening or classification methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If washing or drying steps are used to separate particles from moist MSWI ash, then separation efficiency is improved, but processing cost and time increase
Solution Approach 1:
The invention extracts and removes the moisture component from the MSWI ash material through a thermal process, separating it from the particulate matter. This extraction of the harmful moisture element enables subsequent dry separation methods to work effectively without requiring extensive washing or drying steps, thus improving separation efficiency while reducing processing time
Solution Approach 2:
The invention changes the moisture content parameter of the MSWI ash from a high initial state to a reduced state through thermal treatment. By controlling the temperature and residence time parameters in the thermal processor, the moisture is evaporated and removed, transforming the material properties to enable efficient dry separation and classification of particles
2Measurement precision
If washing or drying steps are used to separate particles from moist MSWI ash, then separation efficiency is improved, but processing cost increases
Solution Approach 1:
The invention performs a preliminary thermal treatment to remove moisture from the MSWI ash before the separation process. This preliminary action of moisture removal simplifies subsequent separation operations, eliminating or reducing the need for energy-intensive washing and drying steps, thereby reducing overall processing costs while maintaining high separation efficiency
Solution Approach 2:
The invention replaces complex mechanical washing and drying systems with a thermal processing approach. By using thermal energy to evaporate moisture and then employing dry classification methods, the system substitutes multiple mechanical unit operations with a more efficient thermal-mechanical hybrid process, reducing equipment complexity and operational costs
3Stability of the object's composition
If moisture content is high in MSWI ash, then particle cohesion increases forming clumps, but separation and retrieval of different particles becomes difficult
Solution Approach 1:
The invention converts the harmful effect of moisture-induced particle cohesion into a beneficial separation mechanism. By applying thermal energy, the moisture is evaporated and the resulting steam carries fine particles away from larger particles through aerodynamic sorting. The moisture that originally caused clumping now serves as a transport medium that facilitates separation when vaporized, turning the cohesion problem into a classification opportunity
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 effectively breaks up clumps and separates particles into distinct fractions, making the ash more suitable for recycling and reuse by reducing cohesion and moisture content, enabling efficient classification and processing of ash with varying compositions.
Implementation Method 1
striking the particle stream with a striking body to impart a sudden change in direction of the particle stream
Implementation Method 2
receiving at least a part of the stricken particle stream on a moving surface in a receiving area and transporting the received particle stream through the receiving area to an outlet
Data Source
Figure 1
AI summary
A method and related apparatus for liberating particles with specific dimensions from a moist Municipal Solid Waste Incinerator ash (MSWI ash) material comprising particles with differing dimensions. In an aspect, the method comprises feeding an amount of the material in a particle stream (20), striking the particle stream with a striking body (3) to impart a sudden change in direction of the particle stream, receiving at least a part of the stricken particle stream on a moving surface (6), and transporting the received particle stream to an outlet beyond the receiving area where the particle stream is divided in a first fraction (40) rich of particles of a first group of particle dimensions, and at least a second fraction (60) rich of particles of a second group of particle dimensions, which second fraction is substantially depleted of particles of the first group of particle dimensions.