Protective Coating for Steam Generator Corrosion Suppression
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Solution Overview
Problem
Conventional methods for suppressing corrosion in power plants require complex equipment and chemical control systems, leading to increased costs and operational complexity.
Innovation Solution
Applying a protective substance such as TiO2, Y2O3, or La2O3 to the surfaces of structural members in the steam generator and pipes, which acts as a barrier against oxygen diffusion, eliminating the need for deaeration and chemical injection systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional corrosion suppressing methods (deaeration, chemical injection, pH control) are used, then corrosion of structural members is prevented, but equipment costs and operating costs increase due to enlarged equipment and complicated operation control
Solution Approach 1:
A protective substance is introduced as an intermediary layer between the structural members and the water environment. This protective substance acts as a mediator that prevents direct contact between corrosive elements (oxygen, metal ions) and the structural members, thereby eliminating the need for complex deaeration and chemical injection systems while maintaining effective corrosion suppression.
Solution Approach 2:
The harmful elements (oxygen, metal ions) are extracted or removed from the water environment before they can cause corrosion. By eliminating these corrosive components from the system, the patent achieves corrosion prevention without requiring complex control systems for pH adjustment, deaeration, or chemical injection.
2Strength
If deaeration and chemical injection systems are installed for corrosion suppression, then structural member integrity is maintained, but equipment costs and operating costs increase
Solution Approach 1:
The protective substance serves as a protective intermediary coating on structural members, providing a barrier that maintains structural integrity without requiring expensive deaeration and chemical injection equipment. This approach achieves the same protective function at lower equipment cost.
3Reliability
If strict water chemistry control and chemical concentration control are implemented, then corrosion is suppressed, but operating costs increase due to complex control requirements
Solution Approach 1:
The protective substance provides self-service corrosion protection by forming a stable barrier layer that automatically prevents corrosion without requiring external chemical injection or continuous water chemistry monitoring. The system becomes self-regulating, eliminating complex control operations.
Solution Approach 2:
The protective substance acts as a stable intermediary barrier that eliminates the need for continuous chemical concentration control and water chemistry management, thereby simplifying operation control while maintaining reliable corrosion suppression.
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 approach significantly reduces equipment and operating costs by preventing corrosion in non-deaerated systems, maintaining structural integrity, and allowing the use of non-deaerated water, while maintaining effective corrosion suppression across varying temperatures and water qualities.
Implementation Method 1
a structural member of a system having a steam generator and a turbine is deposited with a protective substance so as to achieve reduction in equipment costs and running costs... acts as a barrier against oxygen diffusion
Data Source
Figure 1~2
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Figure 5~6
AI summary
In a plant including a system which is provided with a steam generator 2, a turbine 3, 5, a condenser 6 and a heater 7 and in which non-deaerated water circulates, and a pipe, the steam generator 2, the heater 7 and 8 of the system which comes into contact with the non-deaerated water is deposited with a protective substance.