Waste Pelletizing via Air Classification and Waste Heat Drying
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Solution Overview
Problem
Current waste management methods are inefficient and costly due to high labor, energy, and time expenditures, particularly in processing light fractions of waste, which include paper and packaging materials, and lack comprehensive energy recovery and utilization.
Innovation Solution
A method that involves drying waste using waste heat from a turbine, followed by ash and dust removal to maintain the calorific value of pellets, and integrating sewage sludge and PET granules to stabilize energy generation, while using a conveyor belt system with sensors and discriminators for sorting and a pellet press for energy production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional waste processing methods are used to handle light fractions (paper and packaging materials), then the waste can be processed, but high labor, energy, and time expenditures are required, leading to high operating costs
Solution Approach 1:
The patent converts the harmful effect of ash and dust accumulation (which reduces calorific value) into a beneficial separation process. By using air classification and suction technology, the system selectively removes ash and dust particles from the waste stream, transforming what would be a detrimental contaminant into a separable component. This allows the remaining fuel material to maintain high calorific value while the ash is efficiently removed and disposed of or utilized separately.
Solution Approach 2:
The patent replaces conventional mechanical sorting and processing methods with pneumatic and aerodynamic systems. Air classification uses airflow to separate particles based on density and size, while suction technology employs controlled air streams to remove ash and dust. This substitution eliminates the need for labor-intensive manual sorting and reduces mechanical processing requirements, thereby lowering energy consumption and operating costs while improving processing efficiency.
2Loss of energy
If waste is incinerated without energy recovery, then waste disposal is achieved, but energy potential is lost and operating costs increase
Solution Approach 1:
The patent performs preliminary separation of ash and dust from the waste stream before incineration through air classification and suction technology. By removing these low-calorific-value components in advance, the remaining fuel material has significantly higher calorific value, which maximizes energy recovery potential during subsequent incineration. This preliminary action ensures that the energy released during combustion is optimized, thereby improving overall energy recovery efficiency.
Solution Approach 2:
The patent implements a feedback mechanism where the separated ash and dust are continuously monitored and adjusted in the separation process. By measuring the calorific value and composition of the fuel material, the system can optimize the separation parameters to maintain maximum energy content in the incinerable fraction. This feedback loop ensures consistent energy recovery efficiency while adapting to variations in waste composition, thereby managing process complexity through intelligent control.
3Device complexity
If ash and dust are not removed from dried waste, then the drying process is simpler, but the calorific value of pellets is reduced, affecting energy production stability
Solution Approach 1:
The patent introduces air as an intermediary medium to separate ash and dust from dried waste. The air classification system uses controlled airflow to carry away lightweight ash and dust particles while leaving behind the heavier, high-calorific-value fuel material. This intermediary approach efficiently removes contaminants without requiring complex mechanical separation equipment, thereby maintaining calorific value stability while keeping the process relatively simple.
Solution Approach 2:
The patent employs pneumatic technology through suction systems and air streams to remove ash and dust from the dried waste. By using pressurized air flows and suction forces, the system selectively extracts lightweight particulate matter that would otherwise contaminate the fuel pellets. This pneumatic approach provides a reliable and stable method for maintaining calorific value without introducing excessive mechanical complexity into the drying and separation 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 reduces operating costs, ensures stable energy production by maintaining the calorific value of pellets, and optimizes waste processing by integrating energy recovery and sorting techniques, enhancing the overall efficiency of waste management.
Implementation Method 1
the energy required for the drying process being supplied by the waste heat of a turbine, which itself is used to generate energy
Implementation Method 2
the heavy fraction that occurs is subjected to predominantly granulating secondary comminution. The two shredding products are then brought together again
Data Source
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AI summary
Disclosed are a waste disposal method and device having the following characteristics: a) a water basin (2, 2a, 2b, 2c) for separating metal components; b) a water basin (3) for separating plastic components and minerals; c) mills (3b, 3d) for processing the plastic components into granulate; d) a mill (4) for comminuting the remaining waste; e) a drying stage (5) for drying the remaining waste; f) a stage (6) for removing ashes from the dried waste; g) a mixing stage (7) for mixing the ash-free waste with plastic granulate and sewage sludge at an adjustable ratio; a press (8) for shaping the mixed product into pellets; i) a stage for burning (9) the pellets in order to generate power.