Selective Scale Control in Desalination via Flow Velocity
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Solution Overview
Problem
Desalination water treatment systems face challenges in managing scale formation, which can lead to reduced efficiency and increased costs due to the need for complete removal of scale-forming ions, a process that is energy- and cost-intensive.
Innovation Solution
The system controls scale formation by selecting and adjusting parameters such as temperature and flow velocity within the desalination apparatus, allowing scale to form selectively within designated zones, reducing unwanted scaling while maintaining high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If complete removal of scale-forming ions is implemented, then scale formation is prevented, but energy consumption and operational costs increase significantly
Solution Approach 1:
The patent applies local quality by creating different flow conditions in different zones of the desalination system. High-velocity turbulent flow is maintained in zones where scale formation is unwanted (heat exchangers, pipes), while low-velocity laminar flow is allowed in designated scaling zones where scale is permitted to form. This spatial differentiation of flow characteristics enables selective scale management without requiring complete ion removal throughout the entire system.
Solution Approach 2:
The system is segmented into distinct functional zones: designated scaling zones where scale formation is controlled and permitted, and non-scaling zones where scale must be prevented. This segmentation allows the system to tolerate scale in specific controlled areas while maintaining scale-free conditions in critical components, thereby reducing the overall energy requirement for scale prevention compared to treating the entire system uniformly.
2Productivity
If complete removal of scale-forming ions is implemented, then system efficiency is maintained, but operational costs increase
Solution Approach 1:
The patent converts the harmful effect of scale formation into a beneficial or at least tolerable outcome by directing it into designated scaling zones. Instead of viewing all scale formation as harmful, the system strategically allows scale to form in specific zones where it does not compromise system efficiency, while protecting critical components from scaling. This approach reduces the operational cost of ion removal while maintaining overall system performance.
3Use of energy by moving object
If scale is allowed to form freely, then energy and cost expenditures are reduced, but system performance deteriorates due to unwanted scaling
Solution Approach 1:
By implementing local quality through zoned flow control, the system allows scale formation in non-critical areas while protecting performance-critical components. Heat exchangers, pumps, and pipes are maintained under high-velocity turbulent flow conditions that prevent scale deposition, ensuring these components maintain optimal heat transfer and flow characteristics. Meanwhile, designated scaling zones with lower velocities accept scale formation without impacting overall system reliability.
Solution Approach 2:
The system employs dynamic flow control mechanisms to adjust velocity profiles in different zones. Pumps and flow distributors are configured to create high-velocity turbulent flow in scale-sensitive areas and lower-velocity laminar flow in designated scaling zones. This dynamic differentiation of flow conditions enables the system to balance scale formation tolerance with performance maintenance, reducing energy expenditure while preserving reliability.
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 effectively reduces scaling in unwanted areas without eliminating scale-forming ions entirely, thereby minimizing energy and cost expenditures while maintaining system performance.
Implementation Method 1
transferring heat, within a heat exchanger of the water treatment system, from a first heat exchanger stream to at least a portion of the ion-diminished stream to heat the ion-diminished stream
Implementation Method 2
evaporating, within a humidifier of the water treatment system, water from the heated ion-diminished stream into a gaseous stream
Implementation Method 3
condensing, within a dehumidifier of the water treatment system fluidically connected to the humidifier, water from the humidified gaseous stream
Data Source
AI summary
Selective scaling in water treatment systems in which desalination is performed is generally described. According to certain embodiments, the location of the formation of solid scale within a water treatment system is controlled by adjusting one or more system parameters, such as the temperature and/or flow velocity of a saline stream within the water treatment system.