Steam Turbine Water Diagnosis Using pH-Conductivity Correlation Maps
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Solution Overview
Problem
Existing water quality diagnosis methods for steam turbine plants do not adequately account for carbonic acid concentration, leading to inappropriate results due to its influence on electrical conductivity and pH measurements.
Innovation Solution
A water quality diagnosis method that includes obtaining measurement values of electrical conductivity and pH from sample water, using a correlation map that takes into account the carbonic acid concentration range to determine water quality abnormality, thereby accounting for changes in carbon dioxide levels and operation states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If water quality diagnosis is performed based on electrical conductivity and pH measurement values without considering carbonic acid concentration, then the diagnosis process is simple, but the diagnosis accuracy deteriorates
Solution Approach 1:
The patent introduces carbonic acid concentration as an additional parameter to the diagnosis system. By incorporating this parameter into the correlation map alongside electrical conductivity and pH, the system transforms from a two-parameter to a three-parameter diagnosis approach, thereby improving accuracy while maintaining reasonable complexity
Solution Approach 2:
The patent extends the diagnosis from a two-dimensional correlation (electrical conductivity vs. pH) to a three-dimensional correlation by adding carbonic acid concentration as the third dimension. This dimensional expansion allows the system to account for the influence of carbonic acid on water quality measurements, resolving the accuracy issue
2Ease of operation
If the correlation map does not account for carbonic acid concentration range, then the diagnosis method is easier to implement, but the reliability of diagnosis results deteriorates
Solution Approach 1:
The patent pre-calculates and stores correlation maps that incorporate the range of carbonic acid concentrations that can be dissolved in sample water. By preparing these multi-dimensional correlation maps in advance, the system eliminates the need for real-time carbonic acid measurement while still accounting for its influence, thus maintaining ease of operation while improving reliability
Solution Approach 2:
The patent anticipates the variability of carbonic acid concentration by creating correlation maps that cover the full range of possible carbonic acid concentrations. This beforehand cushioning approach ensures that regardless of the actual carbonic acid level, the diagnosis remains reliable by selecting the appropriate pre-prepared correlation map
Data Source
AI summary
A water quality diagnosis method, includes: a step of obtaining a measurement value of electrical conductivity of a sample water derived from a steam or a circulating water obtained from a steam turbine plant using ammonia as a water conditioner and a measurement value of pH of the sample water; and a determination step of determining presence or absence of abnormality of water quality of the steam turbine plant by using at least a first determination condition of whether the measurement value of the electrical conductivity and the measurement value of the pH are included in a first determination region which is set within a first correlation map of the electrical conductivity and the pH taking into account a carbonic acid concentration range where carbonic acid is dissolvable in the sample water.