Radial Flow Vessel Uniform Fluid Distribution Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial-scale radial flow vessels face challenges in achieving uniform fluid flow distribution, leading to inefficiencies in processes like adsorption and reaction, due to non-uniform flow maldistribution, which results in lower purity products and increased costs.
Innovation Solution
A radial flow vessel design with proportional inner and outer channel cross-sectional areas and controlled pressure drops ensures uniform flow distribution by maintaining channel pressure drops at or below 10% of the bed pressure drop, using a cylindrical vessel with concentric porous baskets and optimizing bed height and transfer length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of radial flow vessels is increased to meet growing product demand, then the frontal flow area increases proportionally, but the vessel footprint increases significantly
Solution Approach 1:
The patent transitions from horizontal/axial flow configurations to radial flow configuration, where fluid flows radially through the bed from the outer periphery toward the center or vice versa. This dimensional change allows the vessel to utilize vertical space more effectively, increasing frontal flow area through greater bed height without proportionally increasing the horizontal footprint, thus resolving the contradiction between throughput capacity and ground area requirements
2Productivity
If the bed of active material is packed densely to create low void volume, then process efficiency improves, but flow distribution uniformity deteriorates
Solution Approach 1:
The patent applies different qualities to different regions of the vessel by implementing variable bed porosity or density profiles. Specifically, the bed packing density varies radially or axially to compensate for non-uniform flow distribution, with denser packing in regions receiving higher flow and less dense packing in regions receiving lower flow. This local adjustment of bed properties ensures uniform flow distribution while maintaining high overall process efficiency
Solution Approach 2:
The patent changes physical parameters of the bed, specifically the void volume or porosity, to optimize flow distribution. By adjusting the bed porosity profile (creating regions of different porosity), the system compensates for non-uniform flow patterns, ensuring that fluid distributes evenly across the bed while maintaining dense enough packing for high process efficiency
3Stability of the object's composition
If channel cross-sectional areas are increased to reduce channel pressure drop, then flow distribution uniformity improves, but vessel volume increases
Solution Approach 1:
The patent optimizes the channel-to-bed pressure drop ratio by adjusting channel dimensions and bed properties. Rather than simply increasing channel size, the system modifies parameters such as channel height, bed porosity, and bed depth to achieve the optimal pressure drop ratio (typically 0.05-0.2). This parametric optimization ensures uniform flow distribution while minimizing the increase in overall vessel volume
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 achieves uniform fluid flow distribution across the bed height, enhancing process efficiency, reducing costs, and preventing early breakthrough of impurities, thereby improving product purity and reactor performance.
Implementation Method 1
a cylindrical porous outer basket disposed concentrically inside the shell along the longitudinal axis... a cylindrical porous inner basket disposed concentrically inside the porous outer basket
Data Source
AI summary
The present invention relates generally to radial flow vessels and processes to achieve even fluid flow distribution through the bed during purification, separation or reaction processes. The radial bed vessel is designed such that the ratio of the cross-sectional flow areas of the flow channels is in proportion to the ratio of the mass flow rates of the process gas with the proportionality constant between 0.7 and 1.4. In addition, the channels each have a cross-sectional flow areas such that the pressure change within each channel is less than or equal to 10% of the pressure drop across the bed of active material under the process operating conditions for the particular gas employed.