Dry Heavy Medium Separator Fluidization Stability
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Solution Overview
Problem
Existing dry method heavy medium separators face issues with unstable fluidization density, non-uniform air flow distribution, low medium separating efficiency for fine materials, and high magnetic medium content, which hinder accurate and efficient coal separation.
Innovation Solution
A dry method heavy medium separator system with a fluidization separation bed using a double-chain scraper conveyor and a novel air distribution system, including a two-section compound type high pressure drop gas distributor and a dense medium short-distance return device, to create a stable fluidized bed for efficient separation, and a fully closed system for dust collection and medium recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gas-solid two-phase fluidized bed is used for dry separation, then separation efficiency is improved, but fluidization density becomes unstable and air flow distribution becomes non-uniform
Solution Approach 1:
The patent changes the physical parameters of the air distributor by using a two-section compound structure with different hole diameters (2mm in first section, 1.5mm in second section) and optimized hole arrangements. This parameter optimization ensures uniform air flow distribution across the bed cross-section, maintaining stable fluidization density and improving separation accuracy simultaneously.
Solution Approach 2:
The air distributor is segmented into two distinct sections with different structural characteristics. The first section has larger holes for primary air distribution while the second section has smaller holes for fine-tuning the flow distribution. This segmentation allows each section to address specific flow distribution requirements, achieving both stability and uniformity.
2Quantity of substance
If existing medium separating screens are used for fine materials, then separation is achieved, but medium separating efficiency is low and magnetic medium content remains high
Solution Approach 1:
The patent applies local quality by using different screen mesh sizes in different sections of the medium separating screen. The first section uses a coarser mesh while the second section uses a finer mesh, optimizing the separation for different particle sizes and densities. This localized optimization improves medium separation efficiency while minimizing magnetic medium contamination in the fine 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 system achieves high-accuracy separation of difficult coal with improved production capacity, enhanced medium separation efficiency for fine materials, and reduced medium consumption, while maintaining a stable and efficient operation.
Implementation Method 1
a gas-solid two-phase fluidized bed with certain density is formed under the action of a uniform upflow, separation materials (such as coal) are layered according to the density of the fluidized bed
Implementation Method 2
separation materials are layered according to the density of the fluidized bed after being fed into a bed. However, these scholars, by just basing on a material replacement principle of a fluidized bed in the chemical industry
Implementation Method 3
with a fine particle material (such as magnetite powder) as a dense medium, a gas-solid two-phase fluidized bed with certain density is formed under the action of a uniform upflow
Implementation Method 4
the magnetic medium content of the fine materials subjected to medium separation is high, the medium separating efficiency for fine materials cannot be improved
Data Source
AI summary
The present invention provides a dry method heavy medium separator adopting a dry method heavy medium separation bed and a separation device. According to the dry method heavy medium separator, a floating material end medium drum screen and a sediment end medium drum screen are arranged below a floating material discharge end and a sediment discharge end of the dry method heavy medium separator and used for separating products from media; a bag-type dust collector is used for collecting dust, a dust collector pipeline is arranged at the top of the dry method heavy medium separator, the air draft volume is larger than the air supply volume during working of the dry method heavy medium separator, the inside of the separator is in a negative pressure state, and therefore dust in the dry method heavy medium separator cannot escape; and the whole system is in a fully closed working state. According to the dry method heavy medium separator adopting the dry method heavy medium separation bed and the separation device, the problems that the fluidization density is instable, the air flow distribution is not uniform in a fluidization process, the medium separation efficiency of an existing medium separation screen for fine materials is low, the magnetic medium content of the fine materials subjected to medium separation is high, and the like are solved, and the medium separation efficiency for fine materials can be improved remarkably.