CN104609488B - Step seawater desalination system and method thereof - Google Patents

Step seawater desalination system and method thereof Download PDF

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Publication number
CN104609488B
CN104609488B CN201510042152.2A CN201510042152A CN104609488B CN 104609488 B CN104609488 B CN 104609488B CN 201510042152 A CN201510042152 A CN 201510042152A CN 104609488 B CN104609488 B CN 104609488B
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China
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sea water
outlet
vaporizer
connected
hydraulic recovery
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CN201510042152.2A
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Chinese (zh)
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CN104609488A (en
Inventor
何纬峰
韩东
岳晨
蒲文灏
罗朝嘉
张轩恺
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南京航空航天大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/10Relating to general water supply, e.g. municipal or domestic water supply
    • Y02A20/124Water desalination
    • Y02A20/126Water desalination characterized by the method
    • Y02A20/128Evaporation methods, e.g. distillation

Abstract

A kind of step seawater desalination system and method thereof, belong to the energy and dynamic field.It is characterized in that: this system also includes hydraulic recovery function of mechanical steam recompression desalinization subsystem, this subsystem includes the vaporizer being connected with humidifier outlet concentrated seawater, the separator being connected with vaporizer sea water side outlet, the compressor being connected with separator vapor outlet, exports the hydraulic recovery device being connected with vaporizer steam side, and the outlet of separator concentrated seawater is connected with the sea water heat collector hot sea water side-entrance of humidification dehumidifying desalinization subsystem.The present invention makes full use of evaporator condensation water pressure and separator in function of mechanical steam recompression desalinization subsystem and discharges the heat load of concentrated seawater, improve comprehensive utilization ratio and the water generation ratio of seawater desalination system of heat energy, have followed the principle of cascaded utilization of energy, meet national energy-saving and reduce discharging and the target of Sustainable Development Strategy of Water Resources.

Description

Step seawater desalination system and method thereof

Technical field

The present invention relates to a kind of step seawater desalination system and method thereof, belong to the energy and dynamic field.

Background technology

Traditional humidification dehumidifying method for desalting seawater is carried out the most at ambient pressure, hot sea water after heat collector heats is mixed with cold air, produce humid air, concentrated seawater after simultaneously being concentrated by humidified device is expelled directly out, owing to the concentrated seawater temperature after concentrating at ambient pressure is relatively low, the concentration ultimately resulting in concentrated seawater is the highest, still there are the potentiality of desalination further, simultaneously, humidification dehumidifying method for desalting seawater generally uses solar energy to heat the supplied materials sea water after dehumidifier preheats as thermal source, the inhomogeneities being distributed by solar energy room and time, have a strong impact on safety and the stability of humidification dehumidifying seawater desalination system.But the concentrated seawater of humidification dehumidifying seawater desalination system is desalinated further, the research of the stability and efficiency of energy utilization that simultaneously improve seawater desalination system does not also draw attention.

Using at present function of mechanical steam recompression method to desalinate sea water is the hot research problem of scholar and engineering circles, in the higher scope of temperature, sea water can be desalinated, the heat-carrying discharging high temperature concentrated seawater can be used for humidifying the heat source of dehumidifying seawater desalination system simultaneously, improve the stability of seawater desalination system and corresponding efficiency of energy utilization.

Summary of the invention

It is an object of the invention to propose a kind of step seawater desalination system and method thereof.

A kind of step seawater desalination system, including humidification dehumidifying desalinization subsystem, hydraulic recovery function of mechanical steam recompression desalinization subsystem;

Wherein humidification dehumidifying desalinization subsystem includes dehumidifier, sea water heat collector, blower fan, humidifier;Wherein dehumidifier sea water side outlet is connected with sea water heat collector brackish water side-entrance, sea water heat collector brackish water side outlet is connected with humidifier sea water side-entrance, dehumidifier cold-air vent is connected with fan inlet, fan outlet is connected with humidifier air side import, and the outlet of humidifier air side is connected with dehumidifier air side import;

It is characterized in that: this system also includes hydraulic recovery function of mechanical steam recompression desalinization subsystem, this subsystem includes vaporizer, separator, compressor, hydraulic recovery device;

In humidification dehumidifying desalinization subsystem, humidifier sea water side outlet is connected with vaporizer sea water side-entrance, vaporizer sea water side outlet is connected with separator import, separator vapor side outlet is connected with compressor inlet, compressor outlet is connected with vaporizer steam side import, evaporator condensation water side outlet is connected with hydraulic recovery device, fresh water after pressure is reduced by the outlet of hydraulic recovery device is discharged, and separator sea water side outlet is connected with the hot sea water inlet side of sea water heat collector in humidification dehumidifying desalinization subsystem;

The work process of step seawater desalination system according to claim 1, including procedure below: supplied materials sea water enters the dehumidifier sea intake in humidification dehumidifying desalinization subsystem, sea water heat collector is entered after Hot wet air heating preheats, fresh water is condensation from Hot wet air heating, cold air flows out from dehumidifier outlet simultaneously, sea water after preheated enters the heating of sea water heat collector, hot sea water enters humidifier after sea water heat collector flows out, enter hot sea water from humidifier top to mix with the cold air after blower fan pressurizes, hot-air after hot sea water heats flows out from humidifier top, enter dehumidifier and complete circulation, a concentrated seawater after cold air cools down flows out bottom humidifier;

Characterized by further comprising procedure below: the concentrated seawater that humidified dehumidifying desalinization subsystem humidifier flows out enters vaporizer, sea water and vapour mixture after evaporator evaporation enter separator, steam after separated device separates flows out from top, after entering compressor boosting, steam enters the concentrated seawater that the vaporizer humidified device of heating flows out, condensed water after evaporator condensation enters hydraulic recovery device, condensed water after blood pressure lowering is discharged from the outlet of hydraulic recovery device, the secondary concentrated seawater flowed out bottom the most separated device enters sea water heat collector heating supplied materials sea water after dehumidifier preheats, secondary concentrated seawater after cooling flows out from the outlet of sea water heat collector.

The concentrated seawater that humidified dehumidifying desalinization subsystem is discharged can be desalinated by above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem further, improves the aquifer yield of seawater desalination system.

The secondary concentrated seawater that above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem is discharged, can be that in warming and humidifying dehumidifying desalinization subsystem, supplied materials sea water after dehumidifier preheats provides stable thermal source, the final safety in operation improving seawater desalination system and stability, improve the efficiency of energy utilization of seawater desalination system simultaneously.

Above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem high pressure condensed water enters hydraulic recovery device acting rear dragging and moves compressor, reclaims the input mechanical power of compressor, improves the efficiency of energy utilization of seawater desalination system.

Vaporizer in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem uses vertical tube falling tubular heat exchanger.

Vaporizer in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem uses titanium material tubular heat exchanger, prevents the concentrated seawater corrosion to evaporator body;

Hydraulic recovery device in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem uses axial flow hydraulic turbine, reclaims the input mechanical power of compressor.

Compressor in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem uses roots-type bi-lobate structure.

Compressor and hydraulic recovery device in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem use coaxial configuration.

Accompanying drawing explanation

Fig. 1 is existing humidification dehumidifying seawater desalination system, in figure: 1 dehumidifier, 2 sea water heat collectors, 3 humidifiers, 4 blower fans, A humidification dehumidifying desalinization subsystem.

Fig. 2 is step seawater desalination system of the present invention, in figure: 5 vaporizers, 6 separators, 7 compressors, 8 hydraulic recovery devices, B hydraulic recovery function of mechanical steam recompression subsystem.

Detailed description of the invention

The running of step seawater desalination system is described referring to Fig. 1, Fig. 2.

Fig. 2 is the step seawater desalination system that the present invention proposes.The work process of this system is as follows: supplied materials sea water enters the dehumidifier sea intake in humidification dehumidifying desalinization subsystem, sea water heat collector is entered after Hot wet air heating preheats, fresh water is condensation from Hot wet air heating, cold air flows out from dehumidifier outlet simultaneously, sea water after preheated enters the heating of sea water heat collector, hot sea water enters humidifier after sea water heat collector flows out, enter hot sea water from humidifier top to mix with the cold air after blower fan pressurizes, hot-air after hot sea water heats flows out from humidifier top, enter dehumidifier and complete circulation, a concentrated seawater after cold air cools down flows out bottom humidifier.So far, if not starting overbottom pressure function of mechanical steam recompression desalinization subsystem, this system operation is identical with Fig. 1.

After installing overbottom pressure function of mechanical steam recompression desalinization subsystem additional, the concentrated seawater that humidified dehumidifying desalinization subsystem humidifier flows out enters vaporizer, sea water and vapour mixture after evaporator evaporation enter separator, steam after separated device separates flows out from top, after entering compressor boosting, steam enters the concentrated seawater that the vaporizer humidified device of heating flows out, condensed water after evaporator condensation enters hydraulic recovery device, condensed water after blood pressure lowering is discharged from the outlet of hydraulic recovery device, the secondary concentrated seawater flowed out bottom the most separated device enters sea water heat collector heating supplied materials sea water after dehumidifier preheats, discharging sea water after cooling flows out from the outlet of sea water heat collector.

Claims (7)

1. a step seawater desalination system, including humidification dehumidifying desalinization subsystem (A), hydraulic recovery function of mechanical steam recompression desalinization subsystem (B);
Wherein humidification dehumidifying desalinization subsystem (A) includes dehumidifier (1), sea water heat collector (2), blower fan (4), humidifier (3);Wherein dehumidifier (1) sea water side outlet is connected with sea water heat collector (2) brackish water side-entrance, and sea water heat collector (2) brackish water side outlet is connected with humidifier (3) sea water side-entrance;Dehumidifier (1) cold-air vent is connected with blower fan (4) import, and blower fan (4) outlet is connected with humidifier (3) air side import, and the outlet of humidifier (3) air side is connected with dehumidifier (1) air side import;
It is characterized in that: this system also includes hydraulic recovery function of mechanical steam recompression desalinization subsystem (B), this subsystem includes vaporizer (5), separator (6), compressor (7), hydraulic recovery device (8);
In humidification dehumidifying desalinization subsystem (A), humidifier (3) sea water side outlet is connected with vaporizer (5) sea water side-entrance, vaporizer (5) sea water side outlet is connected with separator (6) import, the outlet of separator (6) steam side is connected with compressor (7) import, compressor (7) outlet is connected with vaporizer (5) steam side import, vaporizer (5) condensed water side outlet is connected with hydraulic recovery device (8), fresh water after pressure is reduced by hydraulic recovery device (8) outlet is discharged, separator (6) sea water side outlet is connected with the hot sea water inlet side of sea water heat collector (2) in humidification dehumidifying desalinization subsystem (A), discharging sea water is discharged from sea water heat collector (2) hot sea water outlet side.
Step seawater desalination system the most according to claim 1, it is characterised in that: the vaporizer (5) in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem (B) uses vertical tube falling tubular heat exchanger.
Step seawater desalination system the most according to claim 1, it is characterised in that: the vaporizer (5) in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem (B) uses titanium material tubular heat exchanger.
Step seawater desalination system the most according to claim 1, it is characterised in that: the hydraulic recovery device (8) in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem (B) uses axial flow hydraulic turbine.
Step seawater desalination system the most according to claim 1, it is characterised in that: the compressor (7) in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem (B) uses roots-type bi-lobate structure.
Step seawater desalination system the most according to claim 1, it is characterised in that: compressor (7) and hydraulic recovery device (8) in above-mentioned hydraulic recovery function of mechanical steam recompression desalinization subsystem (B) use coaxial configuration.
The work process of step seawater desalination system the most according to claim 1, including procedure below: supplied materials sea water enters dehumidifier (1) sea intake in humidification dehumidifying desalinization subsystem (A), sea water heat collector (2) is entered after Hot wet air heating preheats, fresh water is condensation from Hot wet air heating, cold air flows out from dehumidifier (1) outlet simultaneously, sea water after preheated enters sea water heat collector (2) heating, hot sea water enters humidifier (3) after sea water heat collector (2) flows out, enter hot sea water from humidifier (3) top to mix with the cold air after blower fan (4) pressurizes, hot-air after hot sea water heats flows out from humidifier (3) top, enter dehumidifier (1) and complete circulation, a concentrated seawater after cold air cools down flows out from humidifier (3) bottom;
Characterized by further comprising procedure below: the concentrated seawater that humidified dehumidifying desalinization subsystem (A) humidifier (3) is flowed out enters vaporizer (5), sea water and vapour mixture after vaporizer (5) evaporates enter separator (6), steam after separated device (6) separates flows out from top, after entering compressor (7) boosting, steam entrance vaporizer (5) heats the concentrated seawater that humidified device (3) flows out, hydraulic recovery device (8) is entered through vaporizer (5) condensed condensed water, condensed water after blood pressure lowering is discharged from hydraulic recovery device (8) outlet, the secondary concentrated seawater that the most separated device (6) bottom is flowed out enters sea water heat collector (2) heating supplied materials sea water after dehumidifier (1) preheats, secondary concentrated seawater after cooling flows out from sea water heat collector (2) outlet.
CN201510042152.2A 2015-01-28 2015-01-28 Step seawater desalination system and method thereof CN104609488B (en)

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Publication number Priority date Publication date Assignee Title
CN105043077B (en) * 2015-07-28 2017-05-17 南京航空航天大学 Air drying system and working method of biomass capable of efficiently recovering waste heat
CN105317486B (en) * 2015-10-15 2017-08-04 南京航空航天大学 Reclaim the water-electricity cogeneration system and method for humid air latent heat
CN105293610B (en) * 2015-11-02 2017-07-18 南京航空航天大学 Marine product dries joint seawater desalination system and method for work
CN105439223B (en) * 2015-11-23 2018-07-10 江苏润海能源科技有限公司 A kind of pressed-steam type REFRIGERATION SYSTEM DRIVEN BY CAPILLARY FORCE desalination plant
CN105439222B (en) * 2015-11-23 2018-11-06 江苏润海能源科技有限公司 A kind of seawater desalination system heat exchange mechanisms

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CN101113030A (en) * 2007-07-05 2008-01-30 中国海洋大学 Low-position heat energy spray evaporation-multiple-effect distillation seawater desalination method and device
CN203095658U (en) * 2013-01-31 2013-07-31 东南大学常州研究院 Air humidifying and solution moisture absorbing solar freshwater preparation device
CN103925024A (en) * 2014-04-15 2014-07-16 南京航空航天大学 Water-power cogeneration system for recovering waste heat of concentrated seawater of desalination and method of system

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JP5975208B2 (en) * 2012-03-13 2016-08-23 株式会社Ihi Seawater desalination apparatus and seawater desalination method using the same

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CN101113030A (en) * 2007-07-05 2008-01-30 中国海洋大学 Low-position heat energy spray evaporation-multiple-effect distillation seawater desalination method and device
CN203095658U (en) * 2013-01-31 2013-07-31 东南大学常州研究院 Air humidifying and solution moisture absorbing solar freshwater preparation device
CN103925024A (en) * 2014-04-15 2014-07-16 南京航空航天大学 Water-power cogeneration system for recovering waste heat of concentrated seawater of desalination and method of system

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