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Seawater desalting method

A seawater and concentrated water technology, applied in chemical instruments and methods, seawater treatment, general water supply saving, etc., can solve the problems of low recovery rate of produced water and high energy consumption, and achieve stable water quality, low energy consumption, and ultra-low pressure. The effect of energy consumption

Active Publication Date: 2013-08-07
OCEAN UNIV OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, aiming at the problems of low water recovery rate and high energy consumption in the existing seawater desalination process, seek to design a new seawater desalination method, which makes full use of thermal seawater Desalination of a large number of low-grade heat sources, increase the flux and recovery rate of the membrane process, reduce the use of membrane elements, prevent inorganic scaling on the reverse osmosis membrane surface and the evaporator surface of the thermal desalination system

Method used

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Examples

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Effect test

Embodiment 1

[0021] Example 1: Nanofiltration-reverse osmosis-low temperature multi-effect thermal membrane coupled seawater desalination

[0022]The seawater desalination system device of this embodiment includes a raw water pump 1, an ultrafiltration water inlet tank 2, a booster pump 3, a self-cleaning device 4, an ultrafiltration device 5, an intermediate water tank 6, a nanofiltration high-pressure pump 7, a nanofiltration device 8, Reverse osmosis device 9, MED device condenser 10, MED device preheater 11, MED device evaporator 12, mixed product water tank 13, mixed concentrated water discharge device 14, raw steam 15 and condensate 16; the inlet of raw water pump 1 and The sea water intake is connected, the outlet of the raw water pump 1 is connected to the ultrafiltration water inlet tank 2, and the flocculation occurs in the ultrafiltration water inlet tank 2, and the outlet of the ultrafiltration water inlet tank is connected to the water inlet of the booster pump 3, and the boost...

Embodiment 2

[0024] Example 2: Nanofiltration-reverse osmosis-low temperature multi-effect thermal membrane coupled seawater desalination

[0025] This embodiment adopts a nanofiltration seawater desalination system device with high ion selectivity, ultra-low pressure and large flux, and loose type. , concentrate water circulation, add acid and add antiscalant to adjust, keep the nanofiltration inlet water pressure as 1.8MPa, all the other components and connections are the same as in Example 1; under this operating condition, the nanofiltration membrane water production flux is 37L. m -2 h -1 , the recovery rate is as high as 60%; through analysis, there is no fouling phenomenon on the side of the nanofiltration concentrated water membrane at this time; 4 2- The true rejection rate of ions is 99%, for CO 3 2- The ion rejection rate is 78%, for Ca 2+ The ion rejection rate is 33%, the desalination rate of nanofiltration membrane elements to seawater is 14.5%, and the rejection rate t...

Embodiment 3

[0026] Example 3: Nanofiltration-reverse osmosis-low temperature multi-effect thermal membrane coupled seawater desalination

[0027] This embodiment adopts the system device of Embodiment 1 [see Figure 1(a)], the concentrated water is circulated, no acid and antiscalant are adjusted, and the nanofiltration water inlet pressure is maintained at 1.9MPa, and the nanofiltration membrane water production flux is 31L m -2 h -1 , the recovery rate is as high as 60%; through concentration polarization analysis, there is still no inorganic scaling on the surface of the nanofiltration concentrated water membrane at this time; 4 2- The true rejection rate of ions is 99%, for CO 3 2- The ion rejection rate is 77%, for Ca 2+ The ion rejection rate is 27%, the desalination rate of nanofiltration membrane elements to seawater is 13%, and the rejection rate to monovalent salts such as sodium chloride and potassium chloride is 9.5%. Content range≤50mg·L -1 The mixing ratio of reverse o...

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Abstract

The invention belongs to the technical field of desalting of seawater, and relates to a seawater desalting method. The seawater desalting method comprises the following steps of: charging filtering water which is obtained by the pretreatment of seawater into a heat exchanger of a heat discharge section of a seawater desalting system for condensing the steam and recovering the heat energy of the heat discharge section to obtain the heat-exchanged warm seawater with higher temperature; transporting the warm seawater into an ultrafiltration device by a low-pressure pump, transporting the ultrafiltration produced water into a nanofiltration device by a high-pressure device, selectively removing the scaled ions in seawater to obtain nanofiltration softened water, and inputting into a reverse osmosis device through the high-pressure pump to obtain reverse osmosis produced water and reverse osmosis concentrated water; recovering the energy of the reverse osmosis concentrated water to be directly taken as the charged water of a heat recovering section of an MED (multi effect distillation) device or an MSF (multi stage flash) device; mixing the desalting produced water and the reverse osmosis produced water through the MED device or the MSF device to be taken as drinking water; and recovering the energy of nanofiltration concentrated water, and mixing with the concentrated water to be discharged or comprehensively utilized. The method is simple in technology, low in energy consumption, high in desalting efficiency, good in effect, simple in device structure, reliable in principle, stable in production process, and environment-friendly.

Description

Technical field: [0001] The invention belongs to the technical field of seawater desalination, and relates to a new technology of nanofiltration-reverse osmosis-low temperature multi-effect / multi-stage flash thermal membrane coupled seawater desalination, in particular to a new technology with ultra-low pressure, large flux and ion selectivity High-quality nanofiltration membrane elements are used for seawater softening treatment and seawater desalination coupled with reverse osmosis and low-temperature multi-effect / multi-stage flash evaporation. Background technique: [0002] The shortage of fresh water resources is increasingly affecting the sustainable development of the national economy and society. Seawater desalination is an effective way to solve the problem of water shortage in coastal areas. At present, seawater desalination methods widely used in industry are mainly divided into two types: membrane method (reverse osmosis RO) and thermal method (multi-stage flash e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/44C02F103/08
CPCY02A20/131
Inventor 高学理宋跃飞苏保卫高从堦
Owner OCEAN UNIV OF CHINA
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