Rotating Drum Fiber Treatment With Retaining Nozzle
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Solution Overview
Problem
Existing pulp treatment processes using rotating drums often result in significant fiber losses due to inefficient separation of fine and coarse fractions, particularly when dealing with soiled waste paper.
Innovation Solution
A rotating drum with an inclined axis of rotation is equipped with a water spray system featuring axially arranged nozzle areas that cover a large area of the inner circumference, and a retaining nozzle to control pulp transport, ensuring comprehensive wetting and fiber removal through the perforation, while minimizing energy and water usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the drum rotates at constant speed with traditional water spraying, then the structure is simple, but the fiber washing is insufficient and transport time is too short
Solution Approach 1:
Water is sprayed onto the fiber material before it reaches the separation zone, pre-wetting and loosening the fibers during the transport phase. This preliminary action ensures that by the time fibers reach the separation zone, they are already sufficiently wetted and separated, reducing fiber loss without requiring extended transport time.
Solution Approach 2:
The system dynamically adjusts water spray intensity and timing based on the position of fiber material within the drum. Water spraying is intensified during the transport phase and modulated during separation, optimizing both washing efficiency and transport speed to prevent fiber loss while maintaining adequate transport time.
2Loss of substance
If water spray coverage is increased to improve wetting, then fiber washing intensifies, but water consumption increases
Solution Approach 1:
Water spray nozzles are strategically positioned to target specific zones where fiber material accumulates or requires intensive washing. The spray coverage is optimized to concentrate water application on areas with highest fiber density or contamination, achieving effective fiber loosening and washing without uniformly increasing water consumption across the entire drum surface.
Solution Approach 2:
The water spray system operates continuously during the fiber transport phase, ensuring that fibers are constantly wetted and loosened as they move through the drum. This continuous action maximizes the utilization of each unit of water applied, preventing fiber loss through sustained washing effectiveness without requiring excessive water volumes.
3Loss of substance
If the drum is open at both ends for easy loading, then operation is simple, but fiber material transports too rapidly reducing treatment time
Solution Approach 1:
Water spraying begins immediately upon fiber material entry into the drum, performing preliminary wetting and loosening actions during the initial transport phase. This ensures that fibers are progressively treated throughout their journey, maximizing treatment time utilization without requiring reduced transport speed or closed drum configuration.
Solution Approach 2:
The water spray system maintains continuous operation throughout the fiber transport path, ensuring uninterrupted washing and loosening action. This continuous treatment approach maximizes the effective treatment time for fibers as they traverse the drum, reducing fiber loss without altering the open-end configuration or transport mechanics.
4Loss of substance
If retainers are added to control fiber transport speed, then treatment time increases, but device complexity increases
Solution Approach 1:
Water spray pressure and flow rate are utilized as hydraulic control mechanisms to regulate fiber material transport speed and residence time within the drum. By adjusting water spray intensity and distribution, the system effectively controls treatment time without requiring mechanical retainers or physical barriers, maintaining device simplicity while achieving extended treatment duration to reduce fiber loss.
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 intensifies the washing and separation of fibers, reducing fiber losses by effectively wetting and removing fibers via the perforation, allowing for controlled treatment time and efficient separation of fractions with reduced energy and water consumption.
Implementation Method 1
The large-area application of the wash water via the nozzle sections ensures extensive wetting of the fiber material, which is loosened by the drum rotation
Implementation Method 2
a water spray tube is arranged inside the drum, which has several axially adjacent nozzle sections with one or more nozzles whose jets, in the direction of rotation, wet a region as continuous as possible
Implementation Method 3
directing at least one retaining nozzle onto the fiber material against the direction of transport. The retaining nozzle thus counteracts excessively rapid transport of the fiber material
Implementation Method 4
the drum is perforated, a fine fraction flows through the perforation and a coarse fraction is rejected by it
Implementation Method 5
a fine fraction flows through the perforation and a coarse fraction is rejected by it
Data Source
Figure 1~2
AI summary
The invention relates to a rotating drum (1) for treating fibrous material (2), the rotational axis (3) of which drum (1) is inclined by at most 30° with respect to the horizontal, into which drum (1) fibrous material (2) which is mixed with water is fed on a first end side (4), which fibrous material (2) is transported within the drum (1) from the first (4) to the second end side (5) by means of transport elements (6), wherein the drum (1) is perforated, and a fine fraction flows through the perforation and a coarse fraction is repelled by said perforation. The treatment of the fibrous material is intensified by virtue of the fact that the first end side (4) of the drum (1) is closed and at least one retaining nozzle (9) directs a water jet onto the fibrous material (2) counter to the transport direction (10) of the fibrous material (2).