Salinity Gradient Power Unit Integrating Desalination Brine
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Solution Overview
Problem
Current salinity gradient power systems are not economically viable due to high installation and operational costs, particularly due to the energy consumption required for pumping high salt solutions, and they are inefficient in areas where access to river water is limited, leading to excessive energy and greenhouse gas emissions in desalination processes.
Innovation Solution
A desalination plant integrated with a salinity gradient power unit that utilizes the brine outlet from a desalination unit as the high salinity feed and seawater as the low salinity feed to generate electrical current, with the option of heating the brine using solar power to enhance energy output, eliminating the need for high-capacity pumps and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional salinity gradient power systems use river water and seawater with pumping, then electrical energy can be generated, but installation and operational costs become excessively high due to energy consumption for pumping
Solution Approach 1:
The patent combines a desalination plant and a salinity gradient power plant into an integrated system. The desalination plant produces fresh water and brine, while the salinity gradient power plant uses the brine (high salinity) and seawater (low salinity) to generate electricity through reverse electrodialysis. This merging eliminates the need for separate pumping systems and creates a synergistic relationship where one plant's byproduct becomes the other's input.
Solution Approach 2:
The integrated system serves itself by using the brine outlet from the desalination unit as the high salinity feed for the power generation unit. The system utilizes naturally occurring salinity gradients between the brine and seawater, eliminating the need for external energy input for pumping. The configuration enables the system to generate its own operational energy needs through the salinity gradient itself.
2Adaptability or versatility
If salinity gradient power systems are deployed in areas with limited river water access, then energy generation potential is reduced, but the systems currently cannot operate effectively without river water input
Solution Approach 1:
The integrated system serves multiple functions: desalination of seawater to produce fresh water and simultaneous generation of electrical energy from the brine byproduct. This multi-functionality allows the system to be deployed in coastal areas without requiring river water access, as both functions utilize seawater as the primary input resource.
3Quantity of substance
If traditional desalination processes are used without energy recovery, then fresh water can be produced, but excessive energy and greenhouse gas emissions are required
Solution Approach 1:
The system recovers energy from the brine byproduct that would otherwise be discarded. The reverse electrodialysis unit captures the potential energy in the salinity gradient between brine and seawater, converting it into electrical energy. This recovery process reduces the net energy consumption of the desalination process and decreases greenhouse gas emissions by replacing fossil fuel-based electricity generation.
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 integration significantly reduces the net energy consumption in desalination processes, making salinity gradient power more viable and reducing greenhouse gas emissions by utilizing existing desalination byproducts and solar energy, thereby decreasing the reliance on fossil fuels and lowering operational costs.
Implementation Method 1
a salinity gradient power unit which is arranged to generate an electrical current from a high salinity feed and a low salinity feed, in which the high salinity feed is brine from the desalination unit and the low salinity feed is seawater
Implementation Method 2
with the option of heating the brine using solar power to enhance energy output
Data Source
AI summary
A desalination plant, includes a sea water intake, a desalination unit having a reverse osmosis or a thermal desalination unit, a fresh water outlet and a brine outlet. The plant also includes a salinity gradient power unit having a brine inlet, a seawater inlet and a mixed water outlet. The brine outlet is connected to the brine inlet and the salinity gradient power unit is arranged to generate an electrical current. A solar power heater is between the brine outlet and the brine inlet. A method for reducing the power consumption of a desalination plant providing fresh water and brine from sea water, includes a first step of providing a salinity gradient power unit, a next step of feeding the salinity gradient power unit with brine from the desalination plant as high salinity feed and sea water as low salinity feed. A subsequent step heats the brine with solar power prior to feeding the brine to the salinity gradient power unit, followed by the steps of generating an electrical current in the salinity gradient power unit and using the electrical current as an energy source for the desalination plant.