Multistage flash evaporation seawater desalination-pressure delay osmotic salinity difference power generation coupled system and operation method thereof

A coupling system and flash evaporation technology, applied in chemical instruments and methods, seawater treatment, generators/motors, etc., can solve the problems of small resource concentration, high natural seawater impurities, and high pretreatment costs, and achieve the goal of reducing salinity, reducing Small impact, the effect of improving energy utilization efficiency

Inactive Publication Date: 2020-05-22
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the difference in the concentration of these salinity energy resources is relatively small, and the cost ...

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  • Multistage flash evaporation seawater desalination-pressure delay osmotic salinity difference power generation coupled system and operation method thereof

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Such as figure 1 As shown, the present invention proposes a multi-stage flash seawater desalination and pressure delayed osmosis salinity difference power generation coupling system, including a connected brine heater 1, a multi-stage flash heat recovery section 2, a multi-stage flash heat discharge section 3, Pressure exchanger 4, booster pump 5, pressure delayed osmosis membrane module 6, water turbine 7, natural seawater introduction pump 12, cooling seawater discharge pump 11, product fresh water extraction pump 13, CO2 removal device 8, oxygen removal device 9 and vacuum pumping Device 10, the liquid side of the multi-stage flash heat discharge section 3 is connected to the low pressure side of the pressure exchanger 4 through the concentrated brine discharge pipe; the low pressure side of the pressure exchanger 4 is conne...

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Abstract

The invention discloses a multistage flash evaporation seawater desalination-pressure delay osmotic salinity gradient power generation coupled system and an operation method thereof. The system comprises a brine heater, a multistage flash evaporation heat recovery section, a multistage flash evaporation heat discharge section, a pressure exchanger, a booster pump, a pressure delay osmotic membraneassembly, a water turbine, a natural seawater introducing pump, a cooling seawater discharge pump, a product fresh water extracting pump, a CO2 removal device, a deoxygenization device and a vacuumizing device which are connected with one another. According to the invention, strong brine and seawater discharged by a multistage flash evaporation system are respectively introduced into the absorbing liquid side and the feed liquid side of the pressure delay osmotic membrane assembly for osmotic power generation; the flow ratio of absorbing liquid to the feed liquid is adjusted through a feed liquid flow control valve; a pressure difference between the two sides of the pressure delay osmotic membrane assembly is adjusted through the booster pump; and the ratio of flow at the two sides of thepressure exchanger is adjusted through a flow control valve. The energy utilization efficiency of the whole system can be improved, the salinity of strong brine discharged by the system is reduced, and influence on the ecological environment is reduced.

Description

technical field [0001] The invention relates to the technical field of seawater desalination and salinity difference energy, in particular to a multi-stage flash seawater desalination and pressure delayed osmosis salt difference power generation coupling system and an operating method. Background technique [0002] Multi-stage flash desalination technology is a thermal seawater desalination technology capable of producing large quantities of fresh water. However, the multi-stage flash seawater desalination technology has high heat consumption and is an energy-intensive seawater desalination method. At the same time, it will discharge a large amount of concentrated brine with a concentration higher than the environment, which will have a negative impact on the surrounding ecological environment. The pressure-delayed osmosis power generation technology can use the solution concentration difference to generate electricity. It is mainly used in areas rich in salt difference ener...

Claims

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Application Information

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IPC IPC(8): C02F9/10H02N11/00C02F103/08
CPCC02F1/06C02F1/20H02N11/002C02F2103/08Y02A20/131
Inventor 严俊杰王宇刘明刘荣堂
Owner XI AN JIAOTONG UNIV
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