Centrifugal Separator for Solid Particle Removal in Viscous Suspensions
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Solution Overview
Problem
Current filtration devices in paper machines are unable to effectively separate solid particles smaller than 80 μm, such as sand, which contaminates the starch liquor and coating color, leading to reduced paper quality and equipment wear, and finer filters clog quickly, disrupting production.
Innovation Solution
A device utilizing a cylindrical and conical chamber design with a tangentially arranged inlet to generate a centrifugal flow that sediments solid particles, allowing them to be separated and discharged, while the cleaned suspension is routed through an inner shell for further processing, using principles of centrifugal force and sedimentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If finer filters are used to separate smaller solid particles, then separation effectiveness is improved, but the filters clog very quickly and productivity deteriorates
Solution Approach 1:
The device divides the separation process into two distinct stages: a first chamber for initial particle removal and a second chamber for fine particle separation. This segmentation allows each chamber to be optimized for its specific function, with the first chamber handling bulk removal to prevent rapid clogging of the more sensitive second chamber.
Solution Approach 2:
The first chamber acts as an intermediary stage between the suspension inlet and the second chamber. It pre-treats the suspension by removing larger particles and reducing the load on the second chamber, thereby extending operational time before clogging occurs while maintaining effective fine particle separation.
2Object-affected harmful factors
If conventional filters are used to remove solid particles, then larger impurities are retained, but smaller particles like sand pass through and cause equipment wear
Solution Approach 1:
The two-chamber design segments particle removal by size: the first chamber with larger openings handles coarse particles, while the second chamber with finer filtration captures smaller particles like sand. This segmented approach effectively protects equipment from wear-causing particles without requiring a single overly restrictive filter that would clog immediately.
Solution Approach 2:
Different regions of the filtration system have different filtering characteristics tailored to local needs. The first chamber provides coarse filtration suitable for high-volume flow, while the second chamber provides fine filtration where particle capture is critical, optimizing both wear protection and flow throughput.
3Quantity of substance
If excessive suspension is applied to paper machines, then coating requirements are met, but the return flow contains contaminants that degrade paper quality
Solution Approach 1:
The device segments the contaminant removal process into two stages, with the first chamber handling bulk contaminants from the excess suspension and the second chamber removing finer particles that would otherwise degrade paper quality. This ensures that even with high suspension application rates, the returned suspension is adequately cleaned.
Solution Approach 2:
The two-chamber design enables continuous operation without frequent maintenance or filter changes. The first chamber handles the bulk of contaminant loading, allowing the second chamber to operate continuously at optimal efficiency, ensuring continuous production without quality degradation.
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 effectively separates solid particles from the suspension, reducing abrasion and equipment wear, improving paper quality and extending equipment lifespan by efficiently removing contaminants like sand, and integrating temperature control and reduced turbulence for improved maintenance.
Implementation Method 1
the inlet (104) is arranged on the inner wall (111) of the cylindrical area (110) essentially tangentially to the inner jacket (140) and is suitable, by introducing the suspension or solution, to create a flow in the area between the inner wall of the cylindrical area and the outer wall of the inner jacket to generate such that the solid particles from the suspension are promoted by the centrifugal force of the flow to the inner wall of the cylindrical area
Implementation Method 2
the conical section tapers downwardly and forms the lower part of the first chamber, has an inner wall and a bottom with a first outlet and is located directly adjacent to the cylindrical section... the solid particles... reach the bottom of the conical area by sedimentation
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a device (10) for separating solid particles from a suspension or solution, in particular for separating ash from a viscous solution, which comprises: a first chamber (100) with a cylindrical section (110), a conical section (120) and an inner shell (140), wherein the cylindrical section (110) forms the upper part of the first chamber (100) and has an inner wall (111) with an inlet (104), the conical section (120) tapers downwards and forms the lower part of the first chamber (100), has an inner wall (121) and a bottom (128) with a first outlet (106) and is arranged directly adjoining the cylindrical section (110), the inner shell (140) has a cylindrical shape and is arranged concentrically within the first chamber (100), preferably in the region of the cylindrical section (110), and has an outer wall (146) and an open bottom. (148) showsand a second outlet (108) is arranged within the inner shell (140). The invention is characterized in that the inlet (104) is arranged on the inner wall (111) of the cylindrical region (110) substantially tangentially to the inner shell (140) and is suitable for generating a flow in the area between the inner wall (111) of the cylindrical region (110) and the outer wall (146) of the inner shell (140) by introducing the suspension or solution,that the solid particles from the suspension are conveyed by the centrifugal force of the flow to the inner wall (111) of the cylindrical section (110) and the inner wall (121) of the conical section (120) and reach the bottom (128) of the conical section (120) by sedimentation and can be discharged via the first outlet (106) and the suspension cleaned of the solid particles can be discharged through the open bottom (148) of the inner shell (140) via the interior of the inner shell (140) and the second outlet (108).