Structured Packing Microchannels for Liquid Maldistribution
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Solution Overview
Problem
Existing structured packing in mass transfer columns does not facilitate uniform liquid spreading across the surfaces, leading to reduced mass transfer efficiency due to maldistribution and inadequate interaction between vapor and liquid phases.
Innovation Solution
The structured packing module features corrugated sheets with a grid of indented and raised structures and microchannels that intersect the corrugation valleys at an angle of 20 to 75 degrees, along with parallel grooves, to enhance liquid distribution and increase the active surface area for interaction, thereby improving mass transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If grooves are used for surface texturing on structured packing sheets, then liquid spreading is facilitated, but liquid maldistribution occurs when sheets are not level, reducing mass transfer efficiency
Solution Approach 1:
The patent applies different surface texturing characteristics to different regions of the structured packing sheet. The grid of indented and raised structures is selectively applied to specific zones, creating localized variations in surface properties that promote uniform liquid distribution while maintaining effectiveness regardless of sheet orientation. This local differentiation allows the packing to self-regulate liquid flow patterns.
Solution Approach 2:
The grid pattern of indented and raised structures creates an asymmetric surface topology that interacts with liquid flow in a controlled manner. The asymmetric arrangement of indented and raised regions generates capillary forces that promote uniform liquid spreading across the sheet, preventing maldistribution while maintaining high mass transfer efficiency regardless of the sheet's orientation relative to gravity.
2Reliability
If a uniform grid of indented and raised structures is applied across the entire sheet, then mass transfer efficiency is improved, but liquid distribution uniformity is compromised when sheets are inclined
Solution Approach 1:
The patent implements non-uniform surface texturing where the grid of indented and raised structures is selectively applied to specific regions rather than the entire sheet. This local differentiation creates zones with optimized capillary properties that work together to distribute liquid uniformly, preventing the maldistribution that would occur with a uniform grid pattern across the whole sheet.
Solution Approach 2:
The patent varies the parameters of the surface texturing pattern, including the spacing, depth, and orientation of the indented and raised structures, to create an optimized distribution of capillary forces. By adjusting these parameters spatially, the design maintains liquid distribution uniformity while preserving high mass transfer efficiency under various operating conditions.
3Reliability
If corrugations are positioned at specific angles to optimize mass transfer, then transfer efficiency is enhanced, but liquid spreading uniformity is reduced due to preferential flow paths
Solution Approach 1:
The patent segments the surface into multiple functional zones with different texturing characteristics. The grid of indented and raised structures divides the liquid flow paths into numerous small channels, creating multiple parallel flow routes that distribute liquid uniformly across the corrugated surface. This segmentation prevents preferential flow paths while maintaining the angle-optimized mass transfer surfaces.
Solution Approach 2:
The patent adds a third dimension to the surface texture by creating a grid of indented and raised structures that extends vertically and laterally. This three-dimensional surface topology interacts with the corrugations to create a complex network of flow paths that promote uniform liquid distribution while preserving the angle-optimized mass transfer geometry.
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 design promotes uniform liquid spreading and increased mass transfer efficiency by optimizing the liquid-vapor interaction, enhancing the active surface area and correcting maldistribution issues within the mass transfer columns.
Implementation Method 1
The indented structures on one face of the structured packing sheet form the raised structures on the opposite face of the structured packing sheet and vice versa. The raised structures that surround the indented structures form rows comprising peaks and interconnecting saddles, with the saddles and indented structures forming rows of microchannels along which liquid preferentially flows.
Implementation Method 2
Mass transfer columns are configured to contact at least two fluid streams in order to provide product streams of specific composition and/or temperature. As a result of these transfer surfaces, the rate and/or degree of mass and heat transferred between the two phases is enhanced.
Data Source
AI summary
A corrugated structured packing sheet has surface texturing that may be in the form of a grid of indented and raised structures. Each indented structure is separated from some or all of adjacent ones of the indented structures by the raised structures. The raised structures form rows of peaks and interconnecting saddles. Microchannels extend along adjacent ones of the indented structures and the interconnecting saddles and intersect the corrugation valleys at an angle in the range of 20 to 75 degrees. The surface texturing may be or include wavy parallel grooves in an upper edge region adjacent the upper edge and a lower edge region adjacent the lower edge and may be or include parallel groove segments in the bulk region that are oriented obliquely to upper and lower edges of the structured packing sheet.