Ion Exchange Resin Regeneration with Split Flow
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Solution Overview
Problem
In water softening apparatuses, split-flow regeneration faces issues with reduced water collection amounts when the ratio of ion exchange resin bed depth to diameter is decreased, leading to regeneration-insufficiency portions and increased hardness leaks, which affect the purity and quantity of treated water.
Innovation Solution
A new regeneration process is introduced, combining co-current and partial counter-current regeneration methods, where the ion exchange resin bed is regenerated in two stages: first, a co-current regeneration process for the entire bed, followed by a partial counter-current regeneration process focusing on the middle and bottom regions, with specific regenerant distribution and collection points to enhance water collection and prevent hardness leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If split-flow regeneration is used, then the structure is simplified compared to counter-current regeneration, but the water collection amount decreases when the resin bed depth-to-diameter ratio is reduced
Solution Approach 1:
The invention segments the resin bed into multiple zones (upper, middle, lower portions) and applies different regeneration flow patterns to each zone. The lower portion receives counter-current flow while the upper portion receives co-current flow, allowing each segment to be optimized for its specific function while maintaining overall system simplicity.
Solution Approach 2:
Different regions of the resin bed are given different local qualities in terms of flow direction and regenerant distribution. The lower portion is designed for counter-current flow to maximize water collection, while the upper portion uses co-current flow for effective regeneration, with each region optimized for its specific role.
2Volume of stationary object
If the resin bed depth-to-diameter ratio is reduced, then the apparatus size is decreased, but regeneration-insufficiency portions appear and water collection amount decreases
Solution Approach 1:
The invention introduces dynamic flow control where the regenerant flow direction changes at different heights in the resin bed. By making the flow pattern adjustable and varied along the vertical axis, the system maintains effective regeneration even when the overall bed depth is reduced, preventing stagnation zones.
Solution Approach 2:
The invention adds vertical dimensionality to the flow pattern by implementing counter-current flow in the lower portion and co-current flow in the upper portion. This multi-directional approach in the vertical dimension ensures comprehensive regenerant distribution throughout the compressed bed volume, eliminating regeneration-insufficiency portions.
3Device complexity
If co-current regeneration is used, then the structure is simple, but the hardness leak level is high reducing treated water purity
Solution Approach 1:
The resin bed is segmented vertically with the lower portion dedicated to counter-current flow for high-purity water production and the upper portion for co-current flow for effective regeneration. This segmentation allows the system to achieve both low hardness leak and practical regeneration efficiency.
Solution Approach 2:
The invention changes the flow direction parameter in the lower portion of the resin bed from co-current to counter-current, which fundamentally alters the regeneration mechanism to produce lower hardness leak levels and higher treated water purity, while maintaining co-current flow in the upper portion for regeneration effectiveness.
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 approach achieves water purity equivalent to counter-current and split-flow regeneration while increasing the water collection amount and maintaining a practical water collection even with a smaller resin bed depth-to-diameter ratio, effectively preventing hardness leaks and optimizing regenerant usage.
Implementation Method 1
a water treating process of passing raw water in a downward flow form through an ion exchange resin bed having a depth D1 to produce treated water, and a regeneration process of passing a regenerant through the ion exchange resin bed
Data Source
AI summary
A regeneration process in the operating method of the invention includes a first regeneration process, and a second regeneration process after the end of the first regeneration process. In the first regeneration process, a regenerant is distributed at a top of an ion exchange resin bed and simultaneously the regenerant is collected at a bottom of the resin bed, thereby generating a downward flow of the regenerant to regenerate the whole of the resin bed. In the second regeneration process, the regenerant is distributed at a bottom of the ion exchange resin bed and simultaneously the regenerant is collected at a middle of the resin bed, thereby generating an upward flow of the regenerant to regenerate a part of the resin bed.