Flow Restrictor Connectors for Reverse Osmosis Permeate Pressure Control
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Solution Overview
Problem
Reverse osmosis systems face inefficiencies in permeate production due to varying osmotic pressures along membrane arrays, leading to uneven net driving pressures and reduced permeate recovery, as well as issues with polarization and fouling.
Innovation Solution
A multi-element membrane array with connectors that include flow restrictors to regulate permeate pressure, maintaining a constant net driving pressure across elements by progressively reducing permeate pressure downstream, thereby optimizing permeate production and reducing fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional membrane arrays are used without flow restrictors, then the system structure is simple, but permeate pressure varies along the array causing uneven permeate flux and reduced recovery
Solution Approach 1:
The membrane array is segmented into multiple elements with individual flow restrictors at each permeate outlet. This segmentation allows independent control of permeate flow from each element, enabling uniform permeate flux distribution across the entire array while maintaining a relatively simple overall structure.
Solution Approach 2:
Flow restrictors are placed at specific locations (permeate outlets of individual membrane elements) to create local flow control. Each restrictor is sized to provide the appropriate pressure drop for its specific position in the array, compensating for varying osmotic pressures and maintaining constant net driving pressure across all elements.
2Productivity
If uniform permeate flux is achieved through flow restrictors, then permeate recovery increases, but the system requires additional components and control mechanisms
Solution Approach 1:
The flow restrictor is merged with the permeate outlet connector, combining the functions of fluid collection and flow control into a single integrated component. This eliminates the need for separate control valves or complex instrumentation while achieving uniform permeate flux distribution.
Solution Approach 2:
The flow restrictors are designed to automatically regulate permeate flow based on local pressure conditions without requiring external control systems. Each restrictor self-adjusts to maintain constant net driving pressure across membrane elements, providing passive flow equalization throughout the array.
3Productivity
If high feed pressure is applied to overcome varying osmotic pressures, then permeate production is maintained, but energy consumption increases
Solution Approach 1:
The system changes the permeate pressure parameter locally at each membrane element outlet through appropriately sized flow restrictors. This creates a pressure gradient that compensates for varying osmotic pressures along the array, maintaining constant net driving pressure and optimizing permeate flux without requiring excessive feed pressure.
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 ensures uniform permeate flux and production across the membrane array, enhancing overall efficiency and reducing polarization, resulting in increased permeate recovery and reduced energy wastage.
Implementation Method 1
Each of the plurality of connectors includes one of a plurality of flow restrictors. Each of the plurality of flow restrictors is sized to further restrict permeate flow into a subsequent permeate pipe
Implementation Method 2
Fresh water is extracted or separated when the pressure of the feed fluid exceeds the osmotic pressure of the fluid which allows permeate or product fluid to cross the semi-permeable reverse osmosis membrane
Implementation Method 3
The pressure required to produce fresh water is proportional to the concentration of the total dissolved solids (TDS) in the feed solution within the reverse osmosis housing
Data Source
AI summary
A reverse osmosis system includes a multi-element membrane array having a plurality of membrane elements disposed in series and a plurality of permeate pipes receiving permeate from a respective one of the plurality of membrane elements. Each of the plurality of elements has an inlet and an outlet. A plurality of connectors coupling successive permeate pipes together. Each of the plurality of connectors includes one of a plurality of flow restrictors. Each of the plurality of flow restrictors is sized to further restrict permeate flow into a subsequent permeate pipe of the plurality of permeate pipes.