Multistage Flash Desalination Stepped Pyramid Modules
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Solution Overview
Problem
Conventional multistage flash (MSF) desalination systems face challenges in modularity, material efficiency, and high capital and operational expenditures due to complex design and manufacturing processes, particularly in flashing chambers and condensers, which hinder their adoption for various size and production requirements.
Innovation Solution
A renewable energy-driven MSF desalination system with a stepped pyramid shape and flash chambers-condensers separation, utilizing mechanical or thermal vapor compression, simplifies design, manufacturing, and operation while reducing energy consumption and material costs by employing a modular structure with angled stages and non-metallic materials for the chambers and condensers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional MSF systems use horizontally stacked stages with built-in condenser tubes, then heat transfer efficiency is improved, but device complexity and capital expenditures increase
Solution Approach 1:
The system divides the MSF plant into multiple independent vertical modules, each containing a flash chamber and condenser as separate but integrated units. This modular segmentation allows for simplified design and manufacturing of individual components while maintaining overall heat transfer efficiency through standardized connections between modules.
Solution Approach 2:
The patent transitions from horizontal stacking of stages to vertical stacking of modular units. Each module processes a specific temperature range, with modules arranged vertically to create a compact footprint. This dimensional change simplifies the internal structure of each module while achieving the same heat transfer function through vertical integration.
2Use of energy by moving object
If conventional MSF systems use built-in condenser tubes inside flash chambers, then heat recovery is improved, but manufacturing and assembly complexity increase
Solution Approach 1:
The condenser is separated from the flash chamber into a distinct component within the modular structure. Instead of embedding tubes inside the flash chamber, the condenser operates as a separate heat exchange unit that receives vapor from the flash chamber through controlled connections, simplifying manufacturing of each component independently.
Solution Approach 2:
The condenser tubes are extracted from the flash chamber interior and positioned as external components within the modular assembly. This extraction allows for independent manufacturing, testing, and replacement of condenser units without affecting the flash chamber structure, thereby improving ease of manufacture and assembly.
3Stability of the object's composition
If conventional MSF systems use supports and stiffeners to hold heavy condensers, then structural stability is improved, but capital expenditures and design complexity increase
Solution Approach 1:
The flash chamber and condenser are merged into a single integrated vertical module with a unified structural framework. This integration eliminates the need for separate support and stiffener systems for the condenser, as the modular design provides inherent structural stability through its self-contained configuration.
Solution Approach 2:
The modular vertical structure allows for flexible assembly and configuration of stages based on operational requirements. The dynamic modular design enables adaptation of structural support needs for each module independently, reducing overall design complexity compared to a fixed conventional structure.
4Productivity
If conventional MSF systems implement complex flashing chambers and condensers, then desalination performance is improved, but operational expenditures increase
Solution Approach 1:
The desalination process is segmented into discrete vertical modules, each handling a specific stage of the flash and condensation process. This segmentation allows for independent operation and maintenance of individual modules, simplifying operational procedures while maintaining overall desalination performance through the coordinated function of all modules.
Solution Approach 2:
The modular design enables self-contained operation of each module with integrated heat recovery within the module structure. The condensers in each module recover heat from outgoing vapor to preheat incoming feed water, creating a self-sustaining thermal cycle that reduces external energy input requirements and simplifies operational 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
The system achieves improved energy efficiency, reduced capital and operational expenditures, and environmental sustainability by simplifying processes and using cost-effective materials, making it a viable alternative to reverse osmosis and other thermal desalination technologies.
Implementation Method 1
as the seawater passes through each stage of the condenser, flashing vapor raises the seawater temperature
Implementation Method 2
one or more demisters are used to distill vapors from the flashing chambers
Implementation Method 3
a built-in condenser tube arranged longitudinal or transversely inside the flash chambers
Implementation Method 4
the heating steam releases its latent heat of condensation to the preheated feed brine
Implementation Method 5
The heated seawater is then passed through a brine heater, which represents the external heat addition component
Implementation Method 6
the heating steam releases its latent heat of condensation to the preheated feed brine
Implementation Method 7
The feed tank is fluidly connected to a first pump. The first pump is fluidly connected to the BH
Implementation Method 8
utilizing flash chambers-condensers separation and mechanical/thermal vapor compression
Data Source
AI summary
A multistage flash (MSF) desalination system is described. The MSF desalination system comprises a feed tank, a brine heater (BH), an MSF tower with n number of stages, n−1 number of condensers each with an inlet and an outlet, and a desalinated water tank. Herein, the feed tank is connected to a first pump, which is connected to the BH; the MSF tower comprises a stepped pyramid shape with n number of connected chambers. The n number of stages each contains at least one flash spray nozzle and a demister. The flash spray nozzles are fluidly connected to drainage of the previous stage, with the flash spray nozzle in the first stage connected to the BH. Further, the condensers are connected to the demisters in n−1 stages and to the next condenser, with the last condenser connected to a second pump, which is connected to the desalinated water tank.