Predictive Control System for Water Purification Shutdown Prevention
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Solution Overview
Problem
Current integrated systems for water purification and power generation face frequent shutdowns due to variations in input feed, which are not adequately monitored in real-time, leading to costly and inefficient operations.
Innovation Solution
A control system that includes an estimator to determine the present state of the water purification system, a predictor to forecast events needed to reach an expected state, and a supervisory control unit to execute these predictions, utilizing real-time parameters and offline data for continuous optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory tests are used to monitor variations in key units, then measurement accuracy is improved, but response time deteriorates due to time-consuming tests and large dead time
Solution Approach 1:
The system performs preliminary monitoring actions by continuously collecting process data (flowrates, temperatures, pressures, compositions) from key units before actual upsets occur. This preliminary data collection enables early detection of anomalies and predictive analysis, allowing corrective actions to be taken before shutdowns are necessary, thus resolving the contradiction between accurate monitoring and rapid response.
Solution Approach 2:
The invention replaces the mechanical/chemical laboratory testing system with an electronic monitoring and prediction system. Sensors and computational algorithms substitute for physical lab tests, enabling real-time detection and prediction of upsets without the time delays inherent in traditional laboratory methods, thereby achieving both high measurement precision and rapid response time.
2Reliability
If real-time monitoring is implemented to detect anomalies early, then system reliability is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The monitoring system is designed with multi-functionality, where a single integrated platform performs multiple tasks: data collection from various process parameters, real-time anomaly detection, predictive analysis, and control recommendations. This universal system approach achieves high reliability without proportionally increasing complexity, as one system accomplishes what would otherwise require multiple separate systems.
Solution Approach 2:
The system incorporates self-service capabilities through automated anomaly detection and prediction algorithms that continuously analyze process data without requiring constant operator intervention. The predictive model automatically identifies trends and potential upsets, reducing the need for complex manual monitoring procedures while maintaining high system reliability.
3Productivity
If corrective actions are taken to prevent shutdowns, then productivity is improved, but device complexity increases due to supervisory control systems
Solution Approach 1:
The supervisory control system implements continuous feedback loops where process data is constantly monitored, compared against predicted values, and used to automatically adjust operational parameters. This feedback mechanism enables the system to self-correct and prevent shutdowns without requiring complex manual control procedures, thereby improving productivity while managing control system complexity through automated closed-loop control.
Data Source
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AI summary
A control system includes an estimator configured to determine a present state of a device and compare the present state of the device with an expected state of the device. The control system further includes a predictor operatively coupled to the estimator, and configured to predict an event for execution by the device to reach the expected state of the device. The control system also includes a supervisory control unit operatively coupled to the predictor and the device, and configured to facilitate execution of the predicted event by the device.