Waste Refrigerator Recycling System with Segmentation and Extraction
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Solution Overview
Problem
Conventional methods for disposing of waste refrigerators lead to environmental pollution and resource waste, as they are either refurbished into hazardous conditions or manually disassembled in poorly managed workshops, resulting in the improper disposal of toxic substances.
Innovation Solution
A method and device for harmless treatment and high-efficiency recycling of waste refrigerators, involving a production line with specific equipment like double shaft shredders, vibratory feeders, and eddy current sorters, within an enclosed workshop with safety and ventilation systems, to recover materials without producing waste gases or residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If waste refrigerators are manually disassembled in small workshops, then useful resources can be recovered, but poisonous and harmful substances are dumped to rivers, buried under the ground or burned to the atmosphere, leading to heavy environmental pollution
Solution Approach 1:
The waste refrigerator is divided into multiple components (compressor, condenser, evaporator, insulation layer, metal frame, plastic parts) and processed separately through specialized equipment. Each component is separated and treated according to its specific properties, enabling resource recovery while preventing pollution from harmful substances like refrigerants and polyurethane foam.
Solution Approach 2:
Manual disassembly operations are replaced by automated mechanical systems including double shaft shredders, rolling crushers, eddy current sorters, and magnetic separators. This substitution eliminates the uncontrolled manual handling that leads to environmental pollution while maintaining efficient resource recovery.
2Adaptability or versatility
If waste refrigerators are refurbished for low-income or rural families, then resources are utilized, but it poses a potential hazard for environmental pollution
Solution Approach 1:
Harmful substances including refrigerants (Freon-12, Freon-22), polyurethane foam, and toxic metals are extracted and removed from the waste refrigerator components. The refrigerants are recovered through specialized extraction equipment, and the polyurethane insulation layer is separated through thermal or mechanical decomposition, eliminating environmental hazards while preserving usable components.
Solution Approach 2:
The process selectively discards harmful substances (refrigerants, toxic insulation materials, contaminated components) while recovering and recycling valuable materials (metals, plastics, refrigerants). This separation ensures that only safe, usable components are available for refurbishment or recycling, eliminating the environmental hazards associated with refurbished waste refrigerators.
3Ease of operation
If conventional disposal methods are used, then operational simplicity is maintained, but huge resource waste occurs
Solution Approach 1:
The physical and chemical parameters of waste refrigerator materials are changed to enable separation and recovery. Thermal parameters are used to decompose polyurethane foam, magnetic parameters separate ferrous metals, eddy current effects separate non-ferrous metals, and density differences separate plastics and other materials. These parameter-based separation methods enable comprehensive resource recovery while maintaining automated operation.
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 solution enables over 95% recycling of materials from waste refrigerators, reducing environmental pollution and resource waste while ensuring safety and low operational costs, suitable for domestic and international applications.
Implementation Method 1
Sorting out the crushed materials by wind force, collecting polyurethane foams using the cyclone collector
Implementation Method 2
separating black metallic iron using a self-discharge type iron remover made of permanent magnet
Implementation Method 3
Leading the materials to the cylindrical iron remover via the second belt conveyor and the first vibratory feeder in a continuous and even manner for magnetic separation of remaining iron
Implementation Method 4
transferred the materials via the second vibratory feeder to the eddy current sorter in a continuous and even manner for separation of non-ferrous metals comprising cooper, aluminum, plastics, and thick polyurethane foam
Data Source
AI summary
A method and device for harmless treatment and recycling of waste refrigerators. Plastic parts, electrical boxes, compressors, and condensers are disassembled at a disassembling station. Refrigerants from compressors are recycled at a fluoride-extracting station. Refrigerator bodies and doors are transferred to a double shaft shredder and a rolling crusher for crushing. Crushed materials are sorted out by wind force, by a self-discharge type iron remover made of permanent magnet and a cylindrical iron remover for magnetic separation. The device is placed in an enclosed workshop equipped with a multistage ventilation system, a protective device of nitrogen, a device for spraying, dedusting, and cooling, and an on-line detection and alarm control device for cyclopentane gas concentration, polyurethane dust concentration, and temperature. The method and device have low manufacturing and operating costs and are dustproof, explosion proof, environmentally friendly and has excellent recycling effects.