Ultrasonic Self-Cleaning Titanium Anodes for Cathodic Protection
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Solution Overview
Problem
Cathodic protection anodes in the oil and gas industry suffer from fouling due to exposure to crude oil and water emulsions, leading to high resistance and rapid failure, necessitating frequent replacement.
Innovation Solution
A self-cleaning anode system with a titanium body and catalytic coating, equipped with piezoelectric transducers that produce ultrasonic vibrations to dislodge fouling deposits, allowing the anode to automatically clean itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If impressed current mixed metal oxide anodes are used to extend service life, then anode durability is improved, but the anode becomes susceptible to fouling by oil/water emulsion which causes high resistance and current discharge failure
Solution Approach 1:
The patent applies ultrasonic vibration to the anode surface to mechanically dislodge fouling deposits of oil and petroleum byproducts. The vibration frequency and intensity are controlled to effectively remove deposits without damaging the anode substrate or catalytic coating, thereby maintaining low resistance and reliable current discharge capability throughout the extended service life
Solution Approach 2:
The anode system incorporates self-cleaning capability through integrated ultrasonic transducers that periodically activate to remove fouling deposits autonomously. This self-service mechanism allows the anode to maintain its performance without requiring manual intervention or system shutdown, ensuring continuous reliable operation in harsh oil/water emulsion environments
2Reliability
If galvanic anodes are used for cathodic protection, then protection effectiveness is achieved, but frequent replacement is required due to short service life
Solution Approach 1:
The anode employs a composite structure consisting of a corrosion-resistant titanium or stainless steel substrate combined with a catalytic coating layer. This composite construction provides both the structural integrity needed for long-term durability and the catalytic activity required for effective current discharge, eliminating the need for frequent replacement while maintaining protection effectiveness
Solution Approach 2:
The patent replaces the traditional consumable galvanic anode system with a durable impressed current anode system that uses electrical energy to drive cathodic protection. This substitution eliminates the need for frequent physical replacement of anodes, as the impressed current system with self-cleaning capability can operate continuously for extended periods
3Adaptability or versatility
If anode is exposed to oil/water emulsion during upset or startup conditions, then operational flexibility is maintained, but fouling occurs leading to rapid failure
Solution Approach 1:
The ultrasonic cleaning system operates periodically to remove fouling deposits that accumulate during upset or startup conditions when the anode is exposed to oil/water emulsion. By activating the ultrasonic transducers at scheduled intervals or when fouling is detected, the system maintains low resistance and reliable current discharge capability while allowing flexible operation under varying process conditions
Solution Approach 2:
The anode system incorporates monitoring capabilities that detect increases in resistance indicating fouling accumulation. When fouling is detected, the system automatically activates the ultrasonic cleaning mechanism to restore low resistance conditions, enabling the anode to maintain reliability while adapting to various operational conditions including upset and startup scenarios
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 effectively maintains anode functionality by periodically dislodging fouling deposits, extending the anode's service life and preventing corrosion.
Implementation Method 1
The at least one piezoelectric transducer is coupled to the body and configured to be electrically coupled to an electrical circuit for receipt of electrical energy to cause the at least one piezoelectric transducer to vibrate at an ultrasonic frequency
Implementation Method 2
the ultrasonic vibrations displace the fouling deposits (e.g., oil and petroleum byproducts) from the catalytic coating
Data Source
AI summary
A self-cleaning anode system for cathodic protection of equipment including a tank in which a liquid to be processed is located. The anode system includes a self-cleaning anode having a titanium body with a catalytic coating thereof. The anode includes at least one piezoelectric transducer for producing ultrasonic vibrations and coupling those vibrations to the catalytic coating on the anode to displace or dislodge any fouling deposits that may have accumulated on the anode during normal its normal operation in cathodically protecting the tank.