Pulverizer Abnormality Detection Using Correlated Operation Data
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Solution Overview
Problem
Existing methods for determining abnormalities in pulverizers of thermal power plants are inaccurate due to the inability to directly observe the accumulation of solid fuel, leading to potential operational inefficiencies and maintenance challenges.
Innovation Solution
An abnormality determination device that acquires operation data from the pulverizer, calculates indices based on correlations between different data sets, and determines abnormalities based on these indices, including a combination of multiple indices and abnormality degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If operation data of the boiler is used to determine abnormalities in the pulverizer, then abnormality determination can be performed, but the determination accuracy is insufficient because the pulverizer state changes are not appropriately reflected
Solution Approach 1:
The patent introduces an intermediary data transmission mechanism where the pulverizer controller transmits operation data (rotation speed, feed rate, air flow rate) and state information to a separate abnormality determination device. This intermediary approach allows the determination device to access relevant pulverizer data without directly observing the pulverizer, resolving the contradiction between enabling determination and preserving accurate state information.
Solution Approach 2:
The system implements feedback by continuously monitoring pulverizer operation data and comparing it against expected relationships (e.g., between rotation speed and feed rate). When deviations exceed thresholds, abnormalities are detected. This feedback loop ensures that determination accuracy improves while maintaining complete information about pulverizer state through the transmitted operation data.
2Measurement precision
If direct visual observation is used to detect solid fuel accumulation, then accurate abnormality detection is possible, but the housing structure prevents direct observation
Solution Approach 1:
The patent replaces direct visual observation (mechanical/optical detection) with electronic sensor-based detection. Sensors inside the pulverizer housing detect solid fuel accumulation, and this data is transmitted electronically to the determination device. This substitution resolves the contradiction by enabling accurate detection without requiring direct visual access through the housing.
Solution Approach 2:
The patent introduces intermediary sensors and data transmission systems that bridge the gap between the enclosed pulverizer environment and the external determination device. These intermediaries enable indirect but accurate detection of solid fuel accumulation, overcoming the observation difficulty caused by the housing structure.
3Measurement precision
If multiple operation data parameters are analyzed to improve determination accuracy, then abnormality detection improves, but the data processing complexity increases
Solution Approach 1:
The patent segments the data processing function into distinct modules: data acquisition from multiple sensors, data transmission to the determination device, and separate analysis of different operation parameters (rotation speed, feed rate, air flow rate). This segmentation allows multiple parameters to be analyzed for improved accuracy while managing complexity through modular architecture.
Solution Approach 2:
The patent uses an intermediary determination device that receives and processes multiple operation data parameters. This intermediary consolidates the complexity of analyzing multiple parameters (rotation speed, feed rate, air flow rate) in one centralized location, allowing improved determination accuracy while keeping the overall system architecture manageable through clear separation of data collection and data analysis functions.
Data Source
AI summary
An abnormality determination device determines whether or not there is an abnormality in a pulverizer that pulverizes solid fuel and supplies the solid fuel to a boiler of a thermal power plant. The abnormality determination device includes a data acquisition unit configured to acquire operation data indicating an operation state of the pulverizer, and an abnormality determination unit configured to determine whether or not there is an abnormality in the pulverizer based on whether or not the acquired operation data falls within a predetermined range.