Device and method for generating electricity through strong brine

Abstract

The invention relates to a device and method for generating electricity through strong brine and belongs to the technical field of salt difference power generation equipment and methods. According tothe technical scheme, a fresh water pretreatment assembly is connected with a fresh water side inlet of a permeable membrane assembly through a fresh water supply pump and a fresh water pipeline; a strong brine pretreatment assembly is connected with a heat exchanger through a strong brine supply pump and a strong brine pipeline; an external heating source is connected with the heat exchanger; theheated strong brine pipeline is connected with a strong brine inlet of the permeable membrane assembly; a strong brine outlet pipeline of the permeable membrane assembly is connected with a water turbine power generation device; a water outlet pipeline of the water turbine power generation device is connected with a pressure exchanger; the pressure exchanger is connected with the heat exchanger;and the heat exchanger is connected with a mixing treatment device. Strong brine can be utilized more effectively for electricity generation, a new solution is provided for comprehensive utilization of strong brine, meanwhile, waste of water resources is reduced, and environmental pollution caused by strong brine discharge is avoided.

Description

technical field [0001] The invention relates to a device and method for generating electricity by utilizing concentrated brine, and belongs to the technical field of salt difference energy generating equipment and methods. Background technique [0002] Salt difference energy refers to the chemical potential difference energy between two kinds of water with different salinity concentrations. At present, the most studied one is the use of the salt difference energy at the confluence of freshwater rivers and seawater. This energy is also a clean and renewable energy. Concentrated brine refers to wastewater in which a large amount of salt is dissolved in water, which itself has a high osmotic pressure. In large industries such as electric power and iron and steel, there is a huge demand for pure water, followed by a large amount of concentrated brine being discharged. At present, the treatment of concentrated brine is mainly by evaporation and crystallization, which has high en...

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Problems solved by technology

[0003] Chinese patents CN103615363A and CN103603764A respectively disclose a salt difference energy generation device and method, and a salt difference energy graded power generation system and method. By using an osmotic membrane for salt difference energy generation, a salt difference energy grading method is proposed to solve the problem of However, the specific form of the osmotic membrane has not been proposed, and the process is relatively complicated and the process is long. The efficiency of osmotic pressure provided by relying solely on the salt concentration difference is low.

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