Probabilistic Heat Exchanger Degradation Evaluation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for managing degradation in large heat exchangers, such as nuclear steam generators, are inefficient in addressing interdependent degradation modes like tube deposit heat-transfer fouling, corrosion, and blockages, leading to reduced thermal efficiency and increased costs due to deterministic calculations that neglect uncertainties.
Innovation Solution
A probabilistic evaluation method is applied to assess the progression of multiple interdependent degradation modes and their economic consequences, allowing for simultaneous evaluation of various remediation strategies that account for systematic and random uncertainties, providing quantitative probabilities for outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deterministic calculations are used to evaluate remediation strategies, then the evaluation process is simple, but the accuracy and reliability of the results deteriorate due to neglecting uncertainties
Solution Approach 1:
The patent replaces deterministic calculation methods with probabilistic evaluation methods that incorporate uncertainty analysis. This substitution transforms the evaluation approach from simple but inaccurate deterministic models to more complex probabilistic models that provide accurate results with quantified confidence levels, directly resolving the contradiction between accuracy and complexity.
Solution Approach 2:
The patent implements feedback loops where evaluation results are used to refine and update the probabilistic models. This continuous refinement process improves accuracy over time while managing complexity through iterative optimization, allowing the system to learn from data and reduce uncertainty in future evaluations.
2Reliability
If multiple interdependent degradation modes are evaluated simultaneously, then the comprehensiveness of the evaluation improves, but the computational complexity and time required worsen
Solution Approach 1:
The patent segments the evaluation process into distinct modules, each handling specific degradation modes (fouling, corrosion, blockages). These modular components can be evaluated independently and then integrated, reducing the computational burden compared to evaluating all modes simultaneously while maintaining comprehensive assessment of interdependencies.
Solution Approach 2:
The patent performs preliminary assessments of individual degradation modes before conducting the full integrated evaluation. This preliminary action identifies critical areas requiring detailed analysis, allowing the system to focus computational resources on the most impactful factors and reduce overall evaluation time while maintaining reliability.
3Reliability
If probabilistic methods are used to account for uncertainties, then the reliability of predictions improves, but the complexity of data processing and analysis worsens
Solution Approach 1:
The patent uses simplified probabilistic models and standardized data structures that replicate complex uncertainty relationships in a manageable format. By creating simplified representations of uncertainty propagation, the system maintains prediction reliability while reducing the actual computational and data processing complexity required to implement and analyze the models.
Data Source
AI summary
A method is provided for evaluating simultaneously the effects of multiple, interdependent heat-exchanger degradation modes for a heat exchanger of a power plant in the context of a series of alternative heat-exchanger remediation strategies. The method includes calculating time-varying predicted future progressions of heat exchanger performance metrics for a plurality of alternative heat-exchanger remediation strategies, and calculating time-varying predicted future progressions of financial metrics describing the accumulated financial benefit of each of the strategies. The calculations may be provided in probabilistic terms. A strategy may then be chosen based, at least in part, on the calculated results.