Helical Separator Elements for Viscous Impingement Particle Collection
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Solution Overview
Problem
Existing systems for removing particulate and liquids from gas streams are inefficient, costly, and pose environmental hazards, particularly in applications with varying gas flow rates and high liquid-to-gas weight ratios, as seen in the case of conventional filter separators in natural gas transmission.
Innovation Solution
A vertically oriented helical separator system with coaxial tubes and radially diverging fins that generate high swirl forces for efficient separation, using a duplex-filtered side stream for continuous liquid re-injection and waste liquid recovery, reducing maintenance needs and material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filter separators are used to remove particulate and liquid from gas streams, then separation function is provided, but frequent manual maintenance and disposal of contaminated filters are required
Solution Approach 1:
The system employs self-cleaning helical separators that automatically remove accumulated liquid and particulate through hydraulic flushing. The separators generate centrifugal forces to separate contaminants and use a small portion of the liquid stream to flush and clean the separation elements continuously, eliminating manual intervention and maintaining reliable operation without shutdowns
Solution Approach 2:
Instead of discarding contaminated filter elements, the system recovers liquid and particulate contaminants through the helical separation process and hydraulic flushing system. The separated liquid is collected and can be reused or properly disposed of, while the solid particulate is removed through the hydraulic flush, converting a waste disposal problem into a resource recovery process
2Manufacturing precision
If helical elements are machined from solid rod with complex geometry, then high separation efficiency is achieved, but manufacturing cost and time increase significantly
Solution Approach 1:
The helical separator elements are divided into modular segments that can be manufactured separately using simpler processes and then assembled into the complete separator assembly. This segmentation allows each module to be produced with standard machining capabilities rather than requiring complex five-axis CNC milling of entire assemblies, reducing manufacturing cost and time while maintaining the precise helical geometry needed for high separation efficiency
Solution Approach 2:
The design incorporates nested helical channels within the separator elements, where simpler geometric features are combined to create the complex three-dimensional separation pathways. The nested structure allows multiple separation functions to be integrated into single manufactured components, reducing the number of parts and assembly steps while achieving the required manufacturing precision through standardized fabrication processes
3Object-affected harmful factors
If large volumes of liquid and particulate are removed from gas streams, then contamination is reduced, but more frequent maintenance and disposal of hazardous waste is required
Solution Approach 1:
The system recovers separated liquid for reuse in the hydraulic flushing system and potential return to the process stream, minimizing waste disposal. Solid particulate is collected through the hydraulic flush and can be disposed of as solid waste rather than mixing with large volumes of liquid hazardous waste, reducing the total volume of hazardous material requiring special handling and disposal
Solution Approach 2:
The system changes the physical state and form of contaminants during separation - liquid is separated as condensate and hydraulic flush medium, while particulate is captured as solid deposits on the helical elements and removed by flushing. This parameter change separates the waste streams into different phases, reducing the volume of hazardous liquid waste and enabling more efficient disposal or recycling of each contaminant type
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 system achieves predictable high swirl regions for effective removal of large volumes of liquid and particulate, requiring less raw materials and simpler manufacturing, with fewer operational interruptions and less hazardous waste, while maintaining high separation efficiency across varying gas flow rates.
Implementation Method 1
Each helical element is typically about 4 inches in diameter and 5 inches in height, and forms helical channels that turn a total about 180 degrees. The channels are formed by parallel fins spaced apart about 0.5625 inch, with an inner radius of about 0.28125 inch and short chamfers on the exterior edge of each fin. With typical gas flow rates, this configuration generates centripetal acceleration forces of about 1,300 G's.
Implementation Method 2
A flowing gas stream enters a separator vessel hydraulically connected to a waste liquid recovery tank. Liquids and particulate separated from the gas stream flow by gravity and inertia into a waste liquid sump. The sump may drain into a waste liquid recovery tank
Implementation Method 3
Liquids and particulate separated from the gas stream flow by gravity and inertia into a waste liquid sump
Data Source
AI summary
A system and methods for separating liquids, aerosols, and solids from a flowing gas stream whereby gas flows through a helical path formed in a separator element. Partially separated gas exits the bottom of the separator element at a generally conical cavity. Clean gas exits through an inner tube that is axially aligned beneath the helical path. Separated materials exit through an annular space between the inner tube and an outer tube. Separation occurs in the helical channels which include radially diverging walls to provide an aerodynamically efficient flow, in a region of high swirl created in a generally conical cavity beneath the separator element, and in a toroidal vortex ring created in the annular space. The area and geometry of the helical path, the conical cavity, and the inner and outer tubes is optimized to provide efficient separation at varying gas flow rates and at varying liquid loads.