Dry SRF Pelletizing System with Thermal Filtration
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Solution Overview
Problem
Existing plastic waste recycling methods using wet cleaning processes face challenges in completely removing water, leading to moisture retention in pellets and increased costs, while also causing environmental pollution through incineration or landfill disposal.
Innovation Solution
A system for pelletizing Solid Refuse Fuel (SRF) that employs a dry process using a first crusher, vibration sieve plate-conveyer, secondary crusher, filter unit with a multi-filter structure, and rotational shafts with hot wires and cooling water pipes to remove impurities and fuse plastic waste without water, resulting in a simpler and more cost-effective recycling method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a wet cleaning process using water is used to remove impurities from plastic waste, then impurity removal effectiveness is improved, but moisture retention in pellets increases and water pollution occurs
Solution Approach 1:
The invention extracts and removes the water cleaning step from the traditional recycling process. Instead of using water to clean impurities, the system directly processes the dry plastic waste through crushing and melting, eliminating the source of moisture retention and water pollution while maintaining impurity removal through mechanical separation and filtration during processing
Solution Approach 2:
The invention replaces the mechanical water-based cleaning system with a thermal processing system. The plastic waste is crushed and then melted at high temperature, where impurities separate and can be removed through filtration during the melting process, substituting mechanical washing with thermal processing and mechanical filtration
2Manufacturing precision
If a hot air drying process is used after dehydration to completely remove moisture, then moisture content in pellets is reduced, but recycling cost increases
Solution Approach 1:
The invention extracts and eliminates the hot air drying process from the recycling system. By avoiding water-based cleaning in the first place, there is no moisture to remove, thereby eliminating the need for energy-intensive drying equipment and operations, reducing both capital investment and operational costs
Solution Approach 2:
The invention performs preliminary action by preventing moisture introduction through the use of a dry processing system from the outset. Rather than adding drying as a subsequent step to remove moisture, the system is designed to never introduce significant moisture, eliminating the need for drying equipment and reducing overall process complexity
3Productivity
If plastic waste is incinerated or disposed of in landfills, then waste management is simplified, but environmental pollution increases
Solution Approach 1:
The invention converts the harmful plastic waste into a beneficial recycled product (pellets) that can be reused. Instead of simply disposing of waste through incineration or landfill, the system processes the plastic waste through crushing, melting, and filtration to produce reusable pellets, transforming waste management into a value-creating recycling process that eliminates pollution while generating economic benefit
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 effectively recycles plastic waste without water pollution, reduces operational costs, treats larger volumes of waste, and minimizes environmental pollution, with a reusable filter unit enhancing durability and reducing overall expenses.
Implementation Method 1
a hot wire, installed in the rotational shaft, to fuse the plastic waste while being transported by the screw
Implementation Method 2
a cooling water pipe, installed in a portion of the second rotational shaft, to cool down the fused plastic waste transported by the first screw
Implementation Method 3
a cooling water pipe, installed in a portion of the second rotational shaft, to cool down the fused plastic waste transported by the first screw
Implementation Method 4
a vibration sieve plate-conveyer that transports primarily crushed plastic waste discharged from the first crusher
Data Source
AI summary
Disclosed is a system for pelletizing Solid Refuse Fuel (SRF). The system includes: a first crusher that primarily crushes plastic waste; a vibration sieve plate-conveyer that transports plastic waste that is primarily crushed by the first crusher; a second crusher that secondarily crushes the primarily crushed plastic waste sieved by the vibration sieve plate-conveyer; a first rotational shaft equipped with a first screw that fuses and transports the plastic waste which is secondarily crushed by the second crusher; a filter unit that is combined with the first rotational shaft and which removes impurities by filtering the secondarily crushed plastic waste that is fused and transported by the first screw; a second rotational shaft equipped with a second screw that transports impurity-free plastic waste filtered by the filter unit; and a molding machine that molds the plastic waste transported by the second screw.