Blending Device Control for Water Softening Wear Reduction
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Solution Overview
Problem
Water softening systems face challenges in maintaining consistent water hardness, leading to wear on adjustable blending devices and reliability issues due to fluctuations in raw water hardness and sensor inaccuracies, resulting in potential corrosion, maintenance costs, and equipment damage.
Innovation Solution
The method involves an electronic control device that ignores unreliable or insignificantly changed current measurement variables during defined operating situations, using stored standard values or last valid measurements to adjust the blending device, thereby reducing wear and maintaining target water hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device continuously adjusts the blending device based on current measured variables, then the water hardness can be maintained at target value, but the blending device experiences increased mechanical wear
Solution Approach 1:
The patent extracts the blending device from continuous adjustment operations by introducing defined operating situations where adjustments are suspended. The control device identifies specific operating conditions (such as regeneration phases, extreme water hardness values, or system startup/shutdown) and excludes the blending device from adjustment operations during these periods, thereby reducing mechanical wear while maintaining water hardness control during normal operation
Solution Approach 2:
The patent implements dynamic adjustment of the control strategy based on operating conditions. The control device continuously monitors system state and automatically switches between continuous adjustment mode and suspension mode depending on the current operating situation, optimizing both water hardness maintenance and blending device protection
2Measurement precision
If the control device uses current measured variables for adjustment, then the water hardness can be precisely controlled, but unreliable measurements can cause significant deviations from target hardness
Solution Approach 1:
The patent prepares the control system by pre-defining operating situations and corresponding measurement evaluation rules before actual operation. The control device has a library of predefined operating conditions (regeneration, startup, shutdown, extreme hardness) and their associated measurement handling strategies, allowing it to quickly switch to appropriate control behavior without complex real-time decision-making
Solution Approach 2:
The control device continuously monitors measured variables and compares them against defined thresholds and operating situation criteria. When measurements indicate unusual conditions (such as values outside expected ranges or patterns suggesting sensor failure), the system provides feedback to suspend adjustment operations, preventing unreliable measurements from causing hardness deviations
3Reliability
If the blending device is frequently adjusted to compensate for water hardness fluctuations, then the target hardness can be maintained, but the mechanical wear on the blending device increases
Solution Approach 1:
The patent removes the blending device from adjustment operations during defined operating situations where continuous adjustment would be counterproductive or harmful. By identifying and excluding specific operating conditions (regeneration, extreme hardness values, system transitions), the system prevents unnecessary mechanical stress while maintaining hardness control during stable operation
Solution Approach 2:
The patent changes the control parameter behavior based on operating conditions. During normal operation, the system uses continuous measurement-based adjustment with full responsiveness. During defined operating situations, the system changes parameters to suspend adjustment or use coarser control steps, reducing mechanical wear while maintaining adequate hardness control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the reliability of water hardness adjustment and reduces mechanical wear on the blending device, minimizing deviations from the target hardness and preventing unnecessary adjustments, thus improving system performance and extending device lifespan.
Implementation Method 1
The hardness agents contained in the water (calcium and magnesium ions) are exchanged for sodium ions in an ion exchange resin.
Implementation Method 2
The hardness of the incoming raw water is determined using a conductivity sensor
Data Source
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AI summary
The invention relates to a method for operating a water softening system (1) comprising – an automatically adjustable blending device for mixing a blended water flow V(t)Verschnitt from a first, softened partial flow V(t)teil1weich and a second partial flow V(t)teil2roh conducting untreated water, and comprising – an electronic control device (11), the control device (11) correcting the adjustment position of the blending device by means of one or more experimentally determined instantaneous measured variables such that the water hardness in the blended water flow V(t)verschnitt is set to a prescribed target value (SW), characterized in that the control device (11) ignores at least one of the one or more instantaneous measured variables for correcting the adjustment position of the blending device in one or more defined operating situations, and assumes in place thereof the latest valid corresponding measured variable prior to the occurrence of the defined operating situation, or a standard value for the corresponding measured variable stored in the electronic control device (11). The method according to the invention can reduce the wear of the automatically adjustable blending device and improve the reliability of setting the water hardness of the blended water.