Spiral-Wound Electrochlorination Cell Axial Flow Design
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Solution Overview
Problem
Current electrochlorination cells face inefficiencies due to complex designs, high power consumption, and maintenance challenges, particularly in managing fluid flow and electrode interactions, which affect the production of disinfectants like sodium hypochlorite.
Innovation Solution
The design of an electrochemical cell with spiral-wound electrodes and concentric tube configurations that direct fluid axially through active areas, enhancing electrode packing density and reducing bypass currents, while using a central core to prevent fluid bypass and maintain efficient fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional concentric tube or parallel plate electrode arrangements are used, then the cell structure is relatively simple, but the active electrode area per unit volume is limited and bypass currents occur
Solution Approach 1:
The patent transitions from conventional 2D parallel plate or simple concentric tube arrangements to a 3D spiral-wound electrode configuration. The electrodes are wound in a spiral pattern around a central collection bar, creating multiple active zones along the fluid path. This dimensional transformation increases the electrode surface area within the same volume while maintaining structural simplicity through the self-contained spiral design.
Solution Approach 2:
The spiral-wound electrodes are nested around a central non-conductive collection bar, with each electrode layer containing the previous one. The anode and cathode are alternately wound, creating a compact nested structure where the fluid flows through the center and exits at the periphery. This nesting maximizes space utilization and eliminates bypass currents by ensuring all fluid passes through the active electrode zones.
2Productivity
If high current is applied to increase disinfectant production, then productivity increases, but power consumption and heat generation increase
Solution Approach 1:
The spiral-wound electrode design segments the electrochemical reaction into multiple zones along the spiral path. The fluid flows sequentially through numerous small active areas rather than one large area, distributing the current density more evenly. This segmentation allows for efficient current utilization and reduces energy waste, enabling high productivity at lower overall power consumption.
Solution Approach 2:
The spiral configuration creates a continuous flow path where fluid is constantly exposed to active electrode surfaces throughout its journey from center to periphery. This continuous interaction ensures that electrochemical reactions occur throughout the entire fluid residence time, maximizing disinfectant production efficiency and reducing the total energy required per unit of product.
3Productivity
If complex electrode arrangements are used to increase active area, then productivity improves, but maintenance difficulty increases
Solution Approach 1:
The spiral-wound design merges multiple electrode functions into a single integrated structure. The anode and cathode are wound together in alternating layers around the collection bar, forming one compact assembly rather than separate components. This merging simplifies maintenance because the entire electrode array can be accessed and replaced as a single unit, eliminating the need to disassemble complex multi-component arrangements.
Solution Approach 2:
Instead of having electrodes arranged in a way that requires disassembly for access, the spiral-wound configuration is designed so that the electrodes are naturally accessible from the ends of the cell. The spiral structure allows maintenance personnel to reach in and service the electrodes without having to dismantle the cell housing or other components, effectively inverting the traditional maintenance accessibility problem.
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 configuration increases the active electrode area per unit volume, enhances disinfectant production efficiency, reduces power consumption, and simplifies maintenance by minimizing bypass currents and fluid flow complexities.
Implementation Method 1
Electrochlorination with generation of sodium hypochlorite from sodium chloride and water. Reaction at anode: 2Cl−→Cl2+2e−. Reaction at cathode: 2Na++2H2O+2e−→2NaOH+H2. In solution: Cl2+2OH−→ClO−+H2O.
Data Source
AI summary
An electrochemical cell includes a housing having an inlet, an outlet, and a central axis and an anode-cathode pair disposed concentrically within the housing about the central axis and defining an active area between an anode and a cathode of the anode-cathode pair. An active surface area of at least one of the anode and the cathode has a surface area greater than a surface area of an internal surface of the housing. The anode-cathode pair is configured and arranged to direct all fluid passing through the electrochemical cell axially through the active area.