Dilution Water Device for Pulping Drum
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Solution Overview
Problem
Conventional pulping drums face challenges in reducing pulp consistency at the beginning of the screening section, leading to larger screen holes, increased energy consumption, and higher investment costs.
Innovation Solution
A device with an annular groove and curved tubes is installed at the end of the pulping section, allowing for continuous dilution of the pulp by directing dilution water into the pulping drum while preventing fiber clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If dilution water is added at the beginning of the screening section in conventional systems, then the pulp consistency is reduced, but the screen holes must be larger and the screening section must be longer, which reduces accept quality and increases costs
Solution Approach 1:
The device adds dilution water at the end of the pulping section before the screening section begins, performing the dilution action in advance at the optimal location. This preliminary dilution reduces pulp consistency to 5%-15% before fibers enter the screening section, allowing smaller screen holes (0.3-0.8mm) to effectively separate fibers while maintaining high accept quality.
2Quantity of substance
If larger screen holes are used to handle high consistency pulp, then pulp consistency can be maintained, but accept quality deteriorates and energy consumption increases
Solution Approach 1:
By adding dilution water at the end of the pulping section, the system performs dilution in advance, reducing pulp consistency to 5%-15% before screening. This allows the use of smaller screen holes that create higher resistance to fiber passage, thereby increasing energy consumption for fiber separation and improving accept quality simultaneously.
3Quantity of substance
If the screening section is made longer to handle high consistency pulp, then pulp consistency is maintained, but investment costs and operating costs increase
Solution Approach 1:
The device performs dilution at the end of the pulping section, reducing pulp consistency to 5%-15% before the screening section. This preliminary action allows the screening section to be shorter because fibers enter at lower consistency, enabling more efficient separation with smaller screen holes (0.3-0.8mm) and reducing both investment and operating costs.
4Quantity of substance
If dilution water is added continuously at the end of the pulping section, then pulp consistency is reduced to 5%-15%, but the risk of fiber clogging in the addition device increases
Solution Approach 1:
Instead of adding dilution water from the inside outward, the device uses curved tubes that project from the annular groove into the drum interior, with openings facing the direction opposite to drum rotation. This inverted configuration prevents fibers from entering the tubes during rotation, as fibers move with the drum rotation while water is injected against the rotation direction, eliminating clogging risk.
Solution Approach 2:
The device replaces complex mechanical clogging prevention mechanisms with a hydrodynamic solution. By injecting dilution water through curved tubes at an angle opposite to drum rotation, the water flow naturally prevents fiber entry into the tubes. The hydrodynamic force of the injected water flushes any potential fibers back into the pulping drum, providing passive clogging resistance without moving parts.
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 solution reduces pulp consistency from 25%-30% to 5%-15%, enabling the use of smaller screen holes, improving accept quality, and reducing energy consumption and investment costs.
Implementation Method 1
Since the radially inner curved tubes are oriented counter to the direction of rotation of the drum, fibers cannot enter the curved tubes or the annular grooves during rotation of the pulping drum
Implementation Method 2
In pulping drums, the pulping section is separated from the screening section by a separating plate with an opening in the middle... This scoop helps transport the dissolved fiber (pulp) forward to the screening section
Data Source
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AI summary
The present invention relates to a device (100) for adding dilution water at the end of the dissolving section of a dissolving drum (200). The device (100) comprises an annular groove (110) arranged around the dissolving section of the dissolving drum (200), wherein the groove base (111) of the annular groove (110) forms the outer wall of the dissolving drum (200) and two opposing annular groove walls (112) project outwards along the radial direction of the dissolving drum (200). Several curved tubes (120) project from the annular groove (110) into the interior of the dissolving drum (200), the radial opening (121) on the inner side of each curved tube (120) being oriented against the direction of rotation of the dissolving drum (200). The annular groove (110) is covered by an annular groove cover (130), which is fixedly arranged. A supply line (140) and a drain line (150) for the dilution water open into the ring groove cover (130).