Cooling Water Quality Control for Variable Makeup Water
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Solution Overview
Problem
Conventional water quality management systems for cooling water systems face challenges in maintaining optimal water quality when the quality of makeup water is variable, leading to unnecessary chemical injection and increased management costs, and errors can occur due to inaccuracies in long-operated electrical conductivity meters without frequent calibration.
Innovation Solution
A water quality management device that determines the concentration control based on both makeup water quality and circulating water quality indices, using sensors and an expert system to adjust chemical injection and water flow, thereby optimizing water treatment system operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target value of concentration rate is determined using makeup water quality in the worst state as reference, then water quality management reliability is improved, but chemical injection amount increases unnecessarily and management cost increases
Solution Approach 1:
The patent applies dynamics by making the target concentration rate adjustable and adaptable based on actual operating conditions. The system allows the target value to be dynamically modified according to real-time makeup water quality measurements and circulating water quality conditions, rather than being fixed based on worst-case scenarios. This enables the system to optimize chemical injection amounts while maintaining reliable water quality management.
Solution Approach 2:
The patent implements parameter changes by allowing the target concentration rate parameter to be modified based on actual water quality measurements. The system measures actual makeup water quality parameters and uses these to adjust the target concentration rate, thereby optimizing chemical injection amounts. This also includes adjusting target values based on circulating water quality parameters and operational conditions.
2Loss of time
If electrical conductivity meter is operated for a long time without frequent calibration, then operation time is extended and calibration cost is reduced, but measurement precision deteriorates and control accuracy decreases
Solution Approach 1:
The patent applies feedback by implementing a system that continuously monitors circulating water quality parameters and uses this information to adjust control decisions. The system measures actual water quality conditions and feeds this information back to modify the target concentration rate, thereby maintaining control accuracy without requiring frequent calibration of measurement devices. The feedback mechanism compensates for potential drift in measurement precision.
Solution Approach 2:
The system implements self-service by using the circulating water quality measurements themselves to guide adjustments in target values and control parameters. The system serves its own calibration needs by using relative measurements and trends to maintain accurate control decisions without external calibration interventions, reducing the need for frequent manual calibration.
Data Source
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AI summary
The present invention comprises: a water quality index value acquisition unit (1101a) that acquires water quality index values including a supply water quality index value indicating the quality of supply water, and a circulating water quality index value indicating the quality of the circulating water; and a determination unit (1103) that determines a concentration control amount for a concentration rate for a circulating water system on the basis of the water quality index value acquired by the water quality index value acquisition unit (1101a).