Thermal Desalination Superstructure Routing Optimization
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Solution Overview
Problem
Current thermal desalination technologies, such as multi-effect distillation (MED) and multi-stage flash (MSF) plants, face inefficiencies in energy reuse and area requirements, limiting their scalability and economic viability, especially in regions with high energy costs and high salinity waters.
Innovation Solution
A superstructure optimization approach that adjusts feed, brine, and vapor routings to enhance thermal desalination processes, incorporating preheaters, split vapor routings, and thermal vapor compression, allowing for simultaneous representation of various routing schemes to maximize distillate production, reduce specific heat transfer area requirements, and increase recovery ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermal desalination processes (MED/MSF) are used, then distillate production is achieved, but area requirements and energy efficiency are suboptimal
Solution Approach 1:
The patent implements dynamic routing of vapor and brine streams through a superstructure that allows flexible configuration of heat transfer paths. The system can adaptively route vapor from different effects to different destinations (preheaters, subsequent effects, or flash stages) based on operational conditions, maximizing heat recovery and reducing the area required for heat transfer operations.
Solution Approach 2:
The system optimizes multiple parameters simultaneously including temperature profiles across effects, pressure gradients in flash stages, flow rates in vapor and brine routings, and heat transfer coefficients. By dynamically adjusting these parameters, the system achieves higher distillate production per unit area compared to conventional fixed-parameter MED/MSF systems.
2Productivity
If conventional thermal desalination processes are used, then distillate production is achieved, but energy reuse efficiency is limited
Solution Approach 1:
The patent implements continuous heat recovery throughout the desalination process by routing vapor from each effect to preheaters that continuously preheat the feed stream. Additionally, vapor is continuously transferred to subsequent effects and flash stages, ensuring that thermal energy is continuously reused rather than lost. This continuous heat recovery loop significantly improves energy efficiency while maintaining high distillate production.
Solution Approach 2:
The system incorporates feedback mechanisms where vapor and brine streams are routed based on real-time conditions in different effects and flash stages. The superstructure allows vapor to be dynamically directed to where it provides maximum heat recovery benefit, creating a feedback-driven energy optimization system that continuously improves energy reuse efficiency.
3Quantity of substance
If thermal desalination is implemented, then fresh water supply is increased, but system complexity and scalability are limited
Solution Approach 1:
The patent divides the desalination system into modular segments including multiple effects, preheaters, and flash stages that can be independently configured and scaled. The superstructure allows these modular units to be connected through flexible vapor and brine routings, enabling the system to be scaled by adding or removing modules without redesigning the entire system. This segmentation facilitates both increased fresh water production and improved scalability.
4Productivity
If conventional routing schemes are used, then thermal desalination operates, but recovery ratios are suboptimal
Solution Approach 1:
The patent implements a universal superstructure where vapor streams serve multiple functions: heating feed in preheaters, heating subsequent effects, and driving flash stages. Similarly, brine streams are routed to multiple destinations including subsequent effects and flash stages. This multi-functional routing configuration maximizes recovery ratios by ensuring that every unit of vapor and brine contributes to distillate production through multiple pathways, while the modular nature maintains manageable complexity.
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 method leads to significant reductions in area requirements and increases in distillate production capacities, optimizing thermal desalination systems by identifying optimal routing configurations and component sizing, thereby improving the overall efficiency and economic feasibility of desalination processes.
Implementation Method 1
feed preheaters along the feed routing to exchange heat with liquid feed in the feed routing
Implementation Method 2
a series of multi-effect distillation effects, each of the effects coupled with at least one routing selected from the feed routing and the brine routings and with one of the vapor routings
Implementation Method 3
vapor generated from the liquid feed
Implementation Method 4
a series of multi-stage flash stages coupled with at least one routing selected from the feed routing and the brine routings and with one of the vapor routings
Implementation Method 5
vapor routings from at least one of the multi-effect distillation effects or the multi-stage flash stages passes through each of the feed preheaters
Implementation Method 6
a down condenser, wherein the vapor routing from a final multi-effect distillation effect in the series of multi-effect distillation effects are coupled with the down condenser
Data Source
AI summary
A superstructure for thermal desalination is optimized by controlling various parameters, wherein the variable parameters include a feed routing for flow of a liquid feed; brine routings for flow of concentrated brine from the liquid feed; vapor routings for vapor generated from the liquid feed; a series of multi-effect distillation effects, each of the effects coupled with at least one routing selected from the feed routing and the brine routings and with one of the vapor routings; and a series of multi-stage flash stages coupled with at least one routing selected from the feed routing and the brine routings and with one of the vapor routings. The superstructure may or may not contain a thermal vapor compressor.