Multi-Stage Bubble-Column Condenser for Energy-Efficient Desalination
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Solution Overview
Problem
Current seawater desalination technologies are energy- and capital-intensive, with high energy costs due to inefficiencies in heat transfer and energy recovery, particularly in humidification-dehumidification systems, which limits their effectiveness in producing fresh water efficiently.
Innovation Solution
A multi-stage bubble-column vapor mixture condenser is used in humidification-dehumidification systems, featuring a carrier-gas inlet and outlet to bubble gas through condensing baths, allowing for temperature differentials and additional carrier gas injection to control heat and mass profiles, enhancing heat transfer coefficients and energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If reverse osmosis is used for desalination, then fresh water can be produced from seawater, but high energy consumption occurs
Solution Approach 1:
The invention employs phase transition of water between liquid and vapor states through controlled heating and cooling cycles. Seawater is heated to generate vapor, which is then condensed to produce fresh water, utilizing the latent heat of vaporization and condensation to drive the desalination process with lower energy input compared to reverse osmosis.
Solution Approach 2:
The system utilizes thermal expansion and contraction of water in response to temperature changes. By cyclically heating and cooling the seawater, the system exploits thermal expansion during heating phases and contraction during cooling phases to facilitate vapor generation and condensation, enabling energy-efficient desalination.
2Quantity of substance
If thermal-energy-based multi-stage flash distillation or multi-effect distillation is used, then fresh water can be produced, but the process is energy- and capital-intensive
Solution Approach 1:
The invention implements continuous cyclic operation where seawater is continuously heated, vaporized, condensed, and cooled in an unbroken sequence. This continuous cycle eliminates idle periods and maintains constant heat transfer efficiency, producing fresh water continuously while minimizing energy waste compared to batch processes.
Solution Approach 2:
The system incorporates feedback mechanisms where the condensed fresh water and cooled brine from each cycle inform and optimize the next heating phase. The thermal energy recovered from condensation feeds back into the heating process, creating a self-regulating system that adjusts heat input based on actual production needs and minimizes energy consumption.
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 significantly reduces energy costs and overall system costs by achieving higher heat-transfer coefficients and maintaining high energy recovery, making the process more efficient and cost-effective for producing fresh water from seawater.
Implementation Method 1
Each stage includes a condenser chamber including a carrier-gas inlet and a carrier-gas outlet. Inside the condenser chamber is a condensing bath, and the carrier-gas inlet is positioned and configured to bubble carrier gas from the carrier-gas inlet up through the condensing bath
Implementation Method 2
Multi-Stage Bubble-Column Vapor Mixture Condensation
Data Source
AI summary
A method for condensing a vapor uses a multi-stage bubble-column vapor mixture condenser that includes at least a first stage, a second stage, and a third stage, each with a carrier-gas inlet and outlet as well as a condensing bath and a volume of carrier gas above the condensing bath. The carrier-gas inlet of the second and third stages is in the form of a sieve plate. The first-stage condensing bath is at a temperature of 60° C. to 90° C. Carrier gas flows at a temperature above 60° C. and up to 93° C. into and through the carrier-gas inlet of the first stage, then into and through the condensing bath in the first stage, and then into and through the volume of carrier gas above the condensing bath in the first stage. The carrier gas then similarly flows through the second- and third-stage condensing baths, each of which is at least 5° C. cooler than the temperature of the condensing bath in the preceding stage. Additional carrier gas is injected through an intermediate-exchange inlet into the volume of carrier gas above the condensing bath in at least one of the first and second stages to control the heat and mass profile of the carrier gas flowing through the stages of the multi-stage bubble-column vapor mixture condenser and to thereby maintain the temperature differentials between the condensing baths in the first, second, and third stages.