Pulper Screening Means Spiral Vessel Design
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Solution Overview
Problem
Existing processors for fibrous raw materials are limited in their versatility and efficiency, as minor design changes significantly impact fiber recovery, quality, energy, and capital requirements, making them less adaptable to various secondary raw materials and processes.
Innovation Solution
A conditioner with a closed vessel capable of multiple functions such as suspension, sorting, fractionation, and grinding, equipped with a heating device and mesh screens, allowing for the processing of diverse fibrous materials, including paper industry waste and organic waste, with customizable design features like a collar and spiral separating devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conditioner is designed with multiple functions (suspension, sorting, fractionation, grinding, dispersing, thickening), then the versatility and adaptability to different secondary raw materials is improved, but the device complexity increases
Solution Approach 1:
The conditioner is designed as a multi-functional processing unit that can perform suspension, sorting, fractionation, grinding, dispersing, and thickening operations within a single closed vessel. Different screen configurations (mesh screens, slotted screens, perforated plates) and adjustable components enable the same device to handle diverse secondary raw materials including paper waste, organic waste, and fibrous materials through various processing modes.
2Reliability
If the collar length is increased to prevent backflow and guide flow from top to bottom, then the flow control effectiveness is improved, but the device height and capital requirements increase
Solution Approach 1:
The collar is designed with variable geometry featuring a conical section that narrows downward and an expansion behind it. This localized structural variation creates different flow characteristics at different positions: the narrowing section guides flow from top to bottom while the expansion section prevents backflow from bottom to top, achieving effective flow control with minimal additional height.
3Ease of operation
If batch operation is used instead of fully continuous operation, then the ease of operation and adaptability to different materials is improved, but the productivity decreases
Solution Approach 1:
The conditioner is designed to operate flexibly in both batch and continuous modes. The closed vessel with removable components allows for batch operation when processing diverse materials requiring different parameters, while the overall system configuration supports continuous operation for standardized materials, enabling dynamic adaptation to production requirements.
4Productivity
If overpressure feeding is implemented, then the throughput and fiber recovery rate are improved, but the energy requirements and equipment stress increase
Solution Approach 1:
Overpressure feeding is implemented through the closed vessel design where pressurized feed introduces material into the conditioner. This hydraulic/pneumatic feeding method enables high throughput and effective fiber recovery by forcing material through the processing zone under pressure, while the closed system contains and recycles the pressure energy.
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 conditioner achieves high pulp recovery and quality, is suitable for batch operation, and can handle a wide range of materials, enhancing throughput and reducing foam formation through overpressure feeding, while maintaining profitability.
Implementation Method 1
If the conditioner has a heating device, it is even suitable for dispersing
Implementation Method 2
When using a mesh screen, the conditioner can also work as a thickener
Implementation Method 3
The collar prevents or impedes backflow from bottom to top, i.e. from the bottom to the top of the conditioner
Data Source
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AI summary
Processor with a closed vessel that can be pressurized and has an upper area with a smaller diameter and a lower area with a larger diameter, wherein the upper area has a small spiral and the lower area has a large spiral, wherein one admission point for materials and one for water are arranged in the upper area, and a heavy-parts trap is arranged in the lower area.