Cylinder-in-Cylinder Deionization Filter for Lower Pressure Drop
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Solution Overview
Problem
Ion exchange resin-based deionization filters in fuel cell systems suffer from high pressure drop and underutilization due to suboptimal designs, leading to inefficient ion removal and reduced resin capacity.
Innovation Solution
A deionization filter assembly with a cylinder-in-cylinder design featuring concentric outer and inner cylinders, annulus, and screen configuration that maximizes resin utilization and reduces pressure drop by alternating fluid flow directions through outer and inner resin beds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion exchange resin-based deionization filters are used to remove ions from coolant, then ion removal function is improved, but pressure drop increases and resin utilization decreases
Solution Approach 1:
The filter assembly is segmented into multiple compartments: an outer cylinder containing outer resin bed and an inner cylinder containing inner resin bed. The fluid flow is divided into separate paths through these segmented resin beds, allowing optimized flow distribution and reduced pressure drop while maintaining effective ion removal capacity.
Solution Approach 2:
The inner cylinder with inner resin bed is nested within the outer cylinder containing outer resin bed, creating a cylinder-in-cylinder configuration. This nested structure maximizes the resin bed volume and height within a compact filter housing, increasing resin utilization without proportionally increasing pressure drop.
2Productivity
If resin bed height is increased to enhance ion removal capacity, then resin utilization is improved, but pressure drop increases and packaging volume increases
Solution Approach 1:
The nested cylinder-in-cylinder design allows the inner resin bed to be positioned within the outer resin bed structure, effectively doubling the resin bed height and volume within a compact footprint. This nested configuration increases resin capacity without proportionally increasing the overall filter assembly volume.
Solution Approach 2:
The design transitions from a single-dimensional resin bed to a multi-dimensional nested structure, utilizing both radial and axial dimensions efficiently. The inner cylinder adds volume in the radial dimension while the stacked configuration utilizes the axial dimension, maximizing resin capacity within constrained packaging space.
3Productivity
If resin bed height is increased to double ion removal capacity, then ion removal efficiency is improved, but pressure drop increases
Solution Approach 1:
The fluid flow path is segmented into multiple stages, passing through outer resin bed and inner resin bed in sequence. This segmentation allows the total ion removal capacity to be distributed across multiple smaller resin beds rather than one large continuous bed, reducing the pressure drop across any single resin bed while maintaining overall high ion removal efficiency.
Solution Approach 2:
The nested cylinder configuration creates a compact double-resin-bed system where fluid flows through both inner and outer resin beds. This nested arrangement effectively doubles the ion removal capacity within a compact space while managing pressure drop through optimized flow distribution across the nested resin beds.
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 assembly effectively doubles the resin bed height while maintaining a similar packaging size, enhancing ion removal efficiency and reducing pressure loss, thus optimizing resin capacity and performance.
Implementation Method 1
Ion exchange resin-based deionization filters can suffer from a high pressure drop due to the resin bed designs
Data Source
AI summary
A deionization filter assembly includes an outer cylinder, an inner cylinder. an endcap, and a screen. The outer cylinder includes a first outer end and a second outer end and is configured to contain an outer resin bed. The inner cylinder is positionable within the outer cylinder and includes a first inner end and a second inner end. The inner cylinder is configured to contain an inner resin bed. The endcap is positionable along the first outer end of the outer cylinder and the first inner end of the inner cylinder and includes an inlet and an outlet. The screen is positionable between the endcap and the outer cylinder and the inner cylinder.