Electrolytic Cell Reverse Polarity Cleaning for Contaminant Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrolytic cells for on-site generation of oxidants face maintenance challenges due to contaminant buildup, which leads to efficiency loss and potential catastrophic failure, particularly in undivided cells, as current methods require regular acid flushing and operator intervention, and are not suitable for high current densities.
Innovation Solution
An automated system that monitors brine flow and contaminant buildup, uses a carbonate detector to initiate acid generation and cleaning, and employs reverse polarity cleaning with reduced current density to maintain cell cleanliness without external acid or operator intervention, ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If undivided electrolytic cells are used to avoid membrane fouling issues, then device complexity is reduced, but contaminant buildup on electrode surfaces causes reliability to deteriorate
Solution Approach 1:
The system uses reverse polarity cleaning where the electrolytic cell cleans itself by switching the electrical polarity. The cathode becomes the anode and vice versa, allowing automatic removal of contaminant films without external intervention or complex cleaning mechanisms
Solution Approach 2:
The cleaning process is performed periodically by alternating between normal operation mode and reverse polarity cleaning mode. The system switches polarity at predetermined intervals to prevent contaminant accumulation during continuous operation
2Reliability
If acid flushing is performed regularly to remove contaminants, then reliability is improved, but ease of operation deteriorates due to operator intervention requirements
Solution Approach 1:
The system automatically performs cleaning by reversing polarity and using the electrolyte solution to remove contaminants. The control system monitors cell performance and initiates cleaning cycles without requiring operator intervention or external acid supplies
Solution Approach 2:
The control system continuously monitors cell parameters such as voltage, current, and productivity to detect contaminant buildup. When thresholds are exceeded, the system automatically initiates reverse polarity cleaning cycles based on real-time feedback from sensors
3Productivity
If high current density is used to maintain productivity, then productivity is improved, but contaminant buildup accelerates causing reliability to worsen
Solution Approach 1:
The system operates at high current density during normal production cycles and periodically switches to reverse polarity cleaning mode. This alternating operation allows the cell to maintain high productivity during operation while preventing contaminant accumulation through periodic cleaning
Solution Approach 2:
Instead of reducing current density to prevent contaminant buildup, the system inverts the electrical polarity. This allows the same high current density to be applied during cleaning cycles, but in reverse, effectively removing contaminants without sacrificing productivity
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 system provides a low-maintenance, reliable method for maintaining electrolytic cell cleanliness, reducing the need for regular acid flushing and operator intervention, and extends the life of electrolytic cells by automatically cleaning contaminants at high current densities, ensuring consistent production of oxidants.
Implementation Method 1
Electrolytic technologies utilizing dimensionally stable anodes have been developed to produce mixed-oxidants and sodium hypochlorite solutions from a sodium chloride brine solution
Implementation Method 2
Reverse Polarity Cleaning for High Current Density Electrolytic Cells
Data Source
AI summary
Method and apparatus for a low maintenance, high reliability on-site electrolytic generator incorporating automatic cell monitoring for contaminant film buildup, as well as automatically removing or cleaning the contaminant film. This method and apparatus preferably does not require human intervention to clean. For high current density cells, cleaning is preferably performed by reversing the polarity of the electrodes and applying a lower current density to the electrodes, preferably by adjusting the salinity or brine concentration of the electrolyte while keeping the voltage constant. Electrolyte flow preferably comprises water and brine flows which are preferably separately monitored and automatically adjusted. For bipolar cells, flow between modules arranged in parallel is preferably approximately equally distributed between modules and between intermediate electrodes within each module.