Anti-Fouling Strainer Coating for Stator Water Cooling

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Solution Overview

Problem

The stator water cooling (SWC) system in electrical power generators faces issues with copper fouling, where copper oxide deposits on components like strainers and filters, leading to reduced coolant flow and potential generator overheating or failure.

Innovation Solution

The implementation of a SWC system strainer with an anti-fouling metallic material on its surface, which has the same zeta potential sign as the fouling copper oxide, thereby minimizing electrostatic interactions and deposition of copper oxide.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional strainers and filters are used in the SWC system, then coolant flow is maintained through debris removal, but copper oxide deposits accumulate on the strainer or filter surface, leading to clogging and reduced coolant flow

Engineering Contradiction:

Improvecoolant flow continuityVSAvoidcopper oxide deposition

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the surface properties of the strainer by applying a coating with different surface characteristics (hydrophobic, oleophobic, or electrostatic properties) to prevent copper oxide adhesion. This parameter change in surface chemistry allows the strainer to maintain its filtration function while resisting copper oxide fouling.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material structure consisting of the base strainer material combined with a specialized coating layer. This composite structure provides both the mechanical filtration capability of the strainer and the anti-fouling properties of the coating material, effectively addressing the copper oxide deposition problem.

Inventive Principle:

Principle #40Composite materials

2Productivity

If the SWC system operates continuously to maximize power generation, then productivity is improved, but copper oxide buildup impedes coolant flow and can cause generator overheating or failure

Engineering Contradiction:

Improvepower generation outputVSAvoidcoolant flow efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies anti-fouling coating to the strainer before installation, performing preliminary protection against copper oxide deposition. This preliminary action ensures that when the system operates continuously, the strainer remains effective without requiring frequent cleaning interruptions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The coated strainer provides self-protection against copper oxide fouling through its specialized surface properties. The coating creates a barrier that prevents copper oxide adhesion, allowing the system to maintain coolant flow efficiency without external intervention or cleaning for extended periods.

Inventive Principle:

Principle #25Self-service

3Reliability

If the generator is taken offline to clean copper oxide deposits from SWC system elements, then copper fouling is removed and coolant flow is restored, but extended downtime reduces power generation productivity

Engineering Contradiction:

Improvecoolant flow restorationVSAvoidpower generation output

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The coated strainer provides self-cleaning properties by preventing copper oxide adhesion in the first place. The hydrophobic, oleophobic, or electrostatic coating causes copper oxide particles to be repelled or fail to adhere, eliminating the need for offline cleaning operations and maintaining continuous power generation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The anti-fouling coating provides preliminary protection against copper oxide deposition before it can occur. By creating a surface that repels or prevents copper oxide adhesion, the coating eliminates the need for subsequent cleaning actions and maintains continuous operational productivity.

Inventive Principle:

Principle #9Preliminary anti-action

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 solution effectively reduces copper fouling on SWC system components, maintaining coolant flow and preventing generator overheating, without requiring extended downtime for cleaning.

Implementation Method 1

an anti-fouling metallic material on the surface of the SWC system strainer, which has the same zeta potential sign as the fouling copper oxide, thereby minimizing electrostatic interactions and deposition of copper oxide

Methodology Applied

Scientific EffectElectrostatic interaction: Electrostatics

Data Source

PatentUS20250154656A1Copper-fouling resistant stator water cooling (SWC) system and method

Publication Date: 2025.05.15 CONSTELLATION ENERGY GENERATION LLC

AI summary

Described herein is a stator water cooling (SWC) system in an electrical power generator with improved resistance to copper fouling, more specifically, to a component of the SWC system, such as a strainer, having an anti-fouling metallic material on the surface of the component. Also described herein is a method of reducing copper fouling in a SWC system that comprises applying an anti-fouling metallic material to the surface of a SWC system component.