CN106938178A - Multi-effect plate type film distilling seawater desalination system based on both vapor compression - Google Patents
Multi-effect plate type film distilling seawater desalination system based on both vapor compression Download PDFInfo
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- CN106938178A CN106938178A CN201710164733.2A CN201710164733A CN106938178A CN 106938178 A CN106938178 A CN 106938178A CN 201710164733 A CN201710164733 A CN 201710164733A CN 106938178 A CN106938178 A CN 106938178A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/364—Membrane distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The present invention relates to a kind of Multi-effect plate type film distilling seawater desalination system based on both vapor compression, mainly including multiple board-like vacuum membrane distillation evaporators, multiple-effect Membrane Materials in series, the indirect steam that preceding effect Membrane Materials are produced heats steam as aftereffect Membrane Materials；Multiple series connection concentrated water flash tanks, receive the concentrated seawater after Membrane Materials and flash step by step, flash-off steam is used as the heating steam for corresponding to each effect；Multiple series connection fresh water flash tanks, receive the fresh water of Membrane Materials production water and flash step by step, flash-off steam is used as the heating steam for corresponding to each effect；Mechanical Vapor Compression, supercharging is heated by consuming electric energy by the indirect steam that end effect membrane component is produced, headed by effect Membrane Materials heating steam is provided；Steam jet ejector, by power steam injection end effect membrane component produce indirect steam, headed by effect Membrane Materials provide heating steam.The present invention has the advantages that technique is advanced, structure is novel, the thermal efficiency is high, water generation ratio is big, strong adaptability.
Description
Technical field
The invention belongs to desalinization and technical field of membrane separation, particularly a kind of Multi-effect plate type film based on both vapor compression
Distillation seawater desalination system.
Background technology
Fresh water is one of base substance that human society is depended on for existence and development, with expanding economy and the increase of population
And water pollution is increasingly serious, there is different degrees of water shortage problem in many countries and regions, and the whole world is faced with increasingly serious
Water resources crisis.
Desalinization is to solve one of important channel of freshwater resources crisis.At present frequently with such as multi-effect distilling, multistage
The technologies such as flash distillation, counter-infiltration and freezing carry out seawater desalination.Membrane Materials (MD) are as emerging membrane separation technique, in desalinization
Field receives much concern.Compared with the conventional methods such as multi-effect distilling, multistage flash evaporation, MD has potential competitive advantage.
Membrane Materials be using dewatering microporous film as medium, in the presence of the steam pressure difference of film both sides, volatile component in feed liquid
Fenestra is passed through in vapour form, so as to realize that liquid matter is separated.Therefore, film distillation technology is organically to combine distillation and UF membrane
The characteristics of, evaporation, mass transfer in existing conventional distil-lation during Membrane Materials, condensation process have separate substance diffusion transmission again
The membrane separating process of film, so that the technology has, separative efficiency is high, operating condition is gentle, to film and material liquid interphase interaction
And the low advantage of mechanical property requirements of film, there is preferable application prospect in desalinization and field of industrial waste water treatment.Vacuum
Membrane Materials (VMD) have the advantages that flux is big, heat loss is small, and application prospect is the most wide.
During film distilling seawater desalination by the heat transfer and mass transfer of hydrophobic porous film be simultaneously carry out.Mass transfer passes through
Fenestra occurs, and heat transfer is produced by film matrix and fenestra.Heat transfer had both been included with the steam or gas by fenestra
Flux and the latent heat transmitted, also including the sensible heat transmitted by membrane material, substantial amounts of heat loss is caused to Membrane Materials process.This
Outside, the output of the high temperature fresh water and strong brine after Membrane Materials, has been further exacerbated by heat loss.This causes film distillation technology energy consumption
Height, water generation ratio is low, limits its scale application in field of seawater desalination.Therefore, it is necessary to the latent heat of Membrane Materials process and
Sensible heat loss reclaim and cascade utilization.In addition, application of the Membrane Materials in desalinization also exist membrane module be difficult extension,
Not the problems such as easy cleaning, production water small scale.
Patent of invention CN101797479B discloses a kind of side that vacuum membrane distillation is carried out using live (open) steam compressing hot pump
Method and device.It mainly lifts the indirect steam after the indirect steam that Membrane Materials are produced, increasing temperature and pressure by vapour compression machine
As the heating steam of Membrane Materials feed liquid, to realize the recycling of the latent heat of vaporization.But the invention uses single-action Membrane Materials, vapour
Change latent heat and do not carry out cascade utilization, water generation ratio is low；And feed liquid is only just directly discharged by a Membrane Materials in the invention, is caused
Fresh-water recovery rate is low and pump work consumes increase.
Patent of invention CN103080013B discloses a kind of steam compressed Membrane Materials system and method.It is mainly by setting
Put Membrane Materials module and reclaim the latent heat of vaporization that Membrane Materials produce steam, and by vapour compression machine by Membrane Materials module low temperature side
The high temperature side of Membrane Materials module is transported to after cold steam lifting quality as heating steam.In the patent of invention, by Membrane Materials film
Pressure in " repeat to " that is constituted with heat transfer film is uncontrollable, that is, the pressure differential between " repeat to " be can not
Control, with accumulation of the incondensable gas in " repeat to ", the pressure in " repeat to " can gradually rise, and the patent is simultaneously
The discharge of fixed gas in " repeat to " and the barometric gradient regulation and control between " repeat to " are not considered, and this can cause steam compressed Membrane Materials
System can not stable operation.In addition, the patent of invention realizes the recycling of the Membrane Materials latent heat of vaporization, but export the aobvious of fluid
Heat does not carry out cascade utilization, and part sensible heat is disposably tightly passed into discrepancy raw material stream by heat exchanger, steamed from Multistage Membranes
For the angle for evaporating heat balance, this can cause the system thermal efficiency to reduce.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, and to propose a kind of Multi-effect plate type film based on both vapor compression and steam
Evaporate seawater desalination system.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of Multi-effect plate type film distilling seawater desalination system based on both vapor compression, including Mechanical Vapor Compression, steam
Jet pump, vavuum pump, seawater feed pump, product water pump, strong brine emptying pump, condenser, four structure identical head effect evaporations
Device, 2nd effect evaporator, triple effect evaporator, last evaporator, four the first fresh water of structure identical flash tanks, the flash distillations of the second fresh water
Tank, the 3rd fresh water flash tank, the 4th fresh water flash tank, three the first strong brine of structure identical flash tanks, the second strong brines dodge
Steaming pot, the 3rd strong brine flash tank, steam jet pump injecting valve, steam jet pump exhaust steam valve, Mechanical Vapor Compression inlet valve,
Mechanical Vapor Compression exhaust steam valve, condenser inlet valve, condenser fresh water drain valve, cooling-water drain valve and seawater inlet valve,
Power steam pipeline is connected with the higher pressure steam inlet of steam jet pump,
Wherein, the outlet of the Mechanical Vapor Compression and the outlet of steam jet pump are steamed by pipeline concatenation machinery respectively
Tandem after vapour compressor exhaust steam valve and steam jet pump air bleeding valve, is then connected with the heating steam inlet of first evaporator；It is first
The indirect steam outlet for imitating evaporator is connected by the heating steam inlet of pipeline and 2nd effect evaporator, two effects, triple effect evaporator
Connected mode it is identical with first evaporator, after the outlet of the indirect steam of last evaporator is by pipeline concatenation condenser inlet valve
It is connected with the steam inlet of condenser, also, the indirect steam outlet of last evaporator is drawn by pipeline concatenation steam jet pump
Penetrate after steam valve and be connected with the low-pressure steam inlet of steam jet pump, also, the indirect steam outlet of last evaporator passes through pipe
It is connected after road concatenation Mechanical Vapor Compression inlet valve with the entrance of Mechanical Vapor Compression；
Wherein, the seawater feed pump is connected by the seawater inlet of pipeline and condenser, and the seawer outlet of condenser connects
Cooling-water drain valve and seawater inlet valve are connected to, seawater inlet valve is connected by the seawater feed entrance of pipeline and last evaporator
Connect, the concentrated water outlet of last evaporator is connected by the seawater feed entrance of pipeline and triple effect evaporator, repeats last evaporator
Seawater feed pipe attachment structure until first evaporator；
Wherein, the fixed gas outlet of the first evaporator is connected by the fixed gas entrance of pipeline and 2nd effect evaporator,
Two effects, the fixed gas connected mode of triple effect evaporator is identical with first evaporator, and the fixed gas outlet of last evaporator passes through pipe
The fixed gas entrance connection of road and condenser；The fixed gas outlet of condenser is connected by pipeline with vavuum pump；First evaporator
Water outlet be connected by pipeline with the fresh water entrance of the first fresh water flash tank, equally, two effects, triple effect and last evaporator
Water outlet is connected with corresponding second, third and the 4th fresh water flash tank respectively, meanwhile, the fresh water of the first fresh water flash tank goes out
Mouth is connected by pipeline with the fresh water entrance of the second fresh water flash tank, and the water outlet of second, third fresh water flash tank uses phase
Same connected mode, the water outlet of the 4th fresh water flash tank is connected by pipeline with product water pump, also, the fresh water of condenser goes out
Mouth passes through the fresh water outlet pipe tandem with the 4th fresh water flash tank after pipeline concatenation condenser fresh water drain valve；
Wherein, the steam (vapor) outlet of the first fresh water flash tank is exported by the indirect steam of pipeline and first evaporator and connected,
The steam (vapor) outlet of second fresh water flash tank is exported by the indirect steam of pipeline and 2nd effect evaporator and connected, equally, and the three, the 4th
The steam (vapor) outlet of fresh water flash tank uses identical connected mode；The concentrated water outlet of first evaporator is by pipeline successively by the
First, second and third strong brine flash tank is connected in series, and the concentrated water outlet of the 3rd strong brine flash tank passes through pipeline and strong brine
Emptying pump is connected, meanwhile, the steam (vapor) outlet of first, second and third strong brine flash tank respectively with corresponding two effects, triple effect and
The indirect steam outlet connection of last evaporator.
Moreover, four structure identicals evaporator, four structure identical fresh water flash tanks and three structures are identical
Strong brine flash tank can be according to seawater desalination system scale compression or expansion.
Moreover, the Multi-effect plate type film distilling seawater desalination system according to claim 1 based on both vapor compression, described
Four structure identical first evaporators, 2nd effect evaporator, triple effect evaporator and last evaporator are using typical plate evaporation
Device structure, it is characterised in that：Embedded board-like film and heat exchanger fin and arranged and structure in particular order in the plate-type evaporator
Into board-like vacuum membrane distillation evaporation structure, the board-like vacuum membrane distillation evaporator thus the board-like film of secondary arrangement, heat exchanger fin, change
Backing and board-like film adjacent one another successively, place sealing ring and support member, so constitute a film block, multiple film blocks between any two
Stacked adjacent, places sealing ring and support member again between module and module, so constitutes membrane stack, and membrane stack two ends are compressed solid with end plate
It is fixed, sealing ring and support member are placed between membrane stack and end plate, two ends end plate is separately fixed on the upper lower wall of shell again, wherein,
Feed liquid passage is constituted between board-like film and heat exchanger fin, heating steam channel is constituted between heat exchanger fin and heat exchanger fin, board-like
Secondary steam channel is constituted between film and board-like film and board-like film and end plate.
Moreover, as one kind preferably, the board-like film is formed by porous hydrophobic thin polymer film；
Moreover, preferably, the heat exchanger fin is metal sheet or thin polymer film；
Moreover, as preferred disposition, the Mechanical Vapor Compression is centrifugal compressor, lobed rotor compressor or screw rod pressure
Contracting machine.
Moreover, as preferred disposition, the steam jet ejector is that nozzle is fixed or adjustable steam ejector.
Moreover, the inlet tube that the product pump outlet tube, strong brine are discharged into pump discharge pipe and seawater feed pump is parallel
Arrangement, heat exchanger is set on three pipelines, and the heat transfer in product water and the strong brine of discharge is given and enters end effect evaporation
The charging seawater of device, carries out energy regenerating.
Moreover, being serially connected with valve on the non-condensable gas pipeline.
Advantages and positive effects of the present invention are：
(1) board-like vacuum membrane distillation evaporator of the invention, will heat the pre- thermal evaporation of the condensation process and feed liquid of steam
PROCESS COUPLING is unified, the heat of heating steam condensation release is steamed by way of feed liquid evaporation carries the latent heat of vaporization to aftereffect
Device transmission is sent out, equivalent to " bilateral phase transformation " heat transfer, heat transfer efficiency is high, greatly reduces feed rate and feed liquid preheating heat consumption,
So as to improve fresh-water recovery rate and water generation ratio.
(2) board-like vacuum membrane distillation evaporator of the invention, can adjust Membrane Materials by the change of " film block " quantity and pass
The load of hot mass transfer, so as to flexibly change the production water scale of multiple-effect film distilling seawater desalination system, it is easy to extend, be readily disassembled clearly
Wash, Load Regulation it is flexible；And condense and be provided with water pot fixed gas discharge line and regulating valve, accurately control heating steam
Passage and secondary steam channel vacuum pressure, keep Membrane Materials cross-film mass transfer driving force stable.
(3) Multi-effect plate type Membrane Materials evaporator is sequentially connected in series by seawater desalination system of the invention, and takes out true by series connection
Empty mode precise control respectively imitates evaporating pressure, and effect is gradually reduced to aftereffect vacuum pressure with certain pressure difference in the past, preceding effect film
The indirect steam of generation is distilled as the heating steam of aftereffect Membrane Materials, and steam mechanical compressor and steam hot compression are set
Device, the indirect steam that end effect Membrane Materials are produced is compressed recycling in whole or in part, so, and each effect evaporator pressure is steady
Fixed controllable, system thermal efficiency and water generation ratio are doubled and redoubled.
(4) Multi-effect plate type film distilling seawater desalination system of the invention uses adverse current feeding, and feed liquid seawater is from low temperature to height
Temperature carries out Membrane Materials by effect, and with preheating temperature difference effect, irreversible heat loss is small；Multistage concentrated water flash tank is set, for Membrane Materials
Discharge the recycling step by step of the sensible heat of concentrated water；Multistage fresh water flash tank is set, for Membrane Materials output fresh water sensible heat step by step
Recycle.
(5) present system is adaptable, in only power supply, power steam and power supply or hot water and electric power
It can be run under conditions of supply, when only power supply, Mechanical Vapor Compression inlet valve, Mechanical Vapor Compression steam discharge
Valve is opened, and the jetting steam caused valve of steam jet pump, steam jet pump air bleeding valve, condenser inlet valve and condenser fresh water drain valve are closed
Close, cooling-water drain valve and seawater inlet valve are adjusted to appropriate aperture；When there is outer confession power steam, Mechanical Vapor Compression enters
Steam valve, Mechanical Vapor Compression exhaust steam valve are closed, and the jetting steam caused valve of steam jet pump, steam jet pump air bleeding valve, condenser enter
Steam valve, condenser fresh water drain valve, cooling-water drain valve and seawater inlet valve are opened；When hot water supply, mechanical vapor-compression
The jetting steam caused valve of machine inlet valve, Mechanical Vapor Compression exhaust steam valve, steam jet pump is closed, steam jet pump air bleeding valve, condensation
Device inlet valve, condenser fresh water drain valve, cooling-water drain valve and seawater inlet valve are opened.
Brief description of the drawings
Multi-effect plate type film distilling seawater desalination system schematic diagram of the accompanying drawing 1 based on both vapor compression；
The board-like vacuum membrane distillation evaporation structure schematic diagram of accompanying drawing 2.
Embodiment
Below by way of accompanying drawing, the present invention is further illustrated, and following examples are descriptive, is not limited
, it is impossible to protection scope of the present invention is limited with this.
A kind of Multi-effect plate type film distilling seawater desalination system based on both vapor compression, as shown in figure 1, including mechanical vapour pressure
Contracting machine 13, steam jet pump 14, vavuum pump 15, seawater feed pump 16, product water pump 17, strong brine emptying pump 18, condenser 5,
Four structure identical first evaporators 1,2nd effect evaporator 2, triple effect evaporator 3, last evaporator 4, four structure identicals
First fresh water flash tank 6, the second fresh water flash tank 7, the 3rd fresh water flash tank 8, the 4th fresh water flash tank 9, three structures are identical
The first strong brine flash tank 10, the second strong brine flash tank 11, the 3rd strong brine flash tank 12, steam jet pump injecting valve
24th, steam jet pump exhaust steam valve 22, Mechanical Vapor Compression inlet valve 25, Mechanical Vapor Compression exhaust steam valve 23, condenser enter
Steam valve 26, condenser fresh water drain valve 21, cooling-water drain valve 19 and seawater inlet valve 20, in the high steam of steam jet pump
Entrance is connected with power steam pipeline 27, it is characterized in that：
Wherein, the outlet of the Mechanical Vapor Compression and the outlet of steam jet pump are steamed by pipeline concatenation machinery respectively
Tandem after vapour compressor exhaust steam valve and steam jet pump air bleeding valve, is then connected with the heating steam inlet of first evaporator；It is first
The indirect steam outlet for imitating evaporator is connected by the heating steam inlet of pipeline and 2nd effect evaporator, two effects, triple effect evaporator
Connected mode it is identical with first evaporator, after the outlet of the indirect steam of last evaporator is by pipeline concatenation condenser inlet valve
It is connected with the steam inlet of condenser；
Wherein, the seawater feed pump is connected by the seawater inlet of pipeline and condenser, and the seawer outlet of condenser connects
Cooling-water drain valve and seawater inlet valve are connected to, seawater inlet valve is connected by the seawater feed entrance of pipeline and last evaporator
Connect, the concentrated water outlet of last evaporator is connected by the seawater feed entrance of pipeline and triple effect evaporator, repeats last evaporator
Seawater feed pipe attachment structure until first evaporator；
Wherein, the fixed gas outlet of the first evaporator is connected by the fixed gas entrance of pipeline and 2nd effect evaporator,
Two effects, the fixed gas connected mode of triple effect evaporator is identical with first evaporator, and the fixed gas outlet of last evaporator passes through pipe
The fixed gas entrance connection of road and condenser；The fixed gas outlet of condenser is connected by pipeline with vavuum pump；In specific implementation
In, valve is serially connected with non-condensable gas pipeline；The water outlet of first evaporator is light by pipeline and the first fresh water flash tank
Water inlet is connected, equally, two effects, triple effect and last evaporator water outlet respectively with it is corresponding second, third and it is the 4th light
Water flash tank is connected, meanwhile, the water outlet of the first fresh water flash tank passes through pipeline and the fresh water entrance of the second fresh water flash tank
Connection, the water outlet of second, third fresh water flash tank uses identical connected mode, and the water outlet of the 4th fresh water flash tank leads to
Piping is connected with product water pump, meanwhile, the water outlet of condenser is concatenated after condenser fresh water drain valve with the by pipeline
The fresh water outlet pipe tandem of four fresh water flash tanks；
Wherein, the steam (vapor) outlet of the first fresh water flash tank is exported by the indirect steam of pipeline and first evaporator and connected,
The steam (vapor) outlet of second fresh water flash tank is exported by the indirect steam of pipeline and 2nd effect evaporator and connected, equally, and second, the
3rd, the steam (vapor) outlet of the 4th fresh water flash tank use identical connected mode, first evaporator concentrated water outlet by pipeline according to
It is secondary to be connected in series first, second and third strong brine flash tank, the outlet of the concentrated water of the 3rd strong brine flash tank by pipeline with
Strong brine emptying pump is connected, meanwhile, the steam (vapor) outlet of first, second and third strong brine flash tank respectively with corresponding two effects,
The indirect steam outlet connection of triple effect and last evaporator, the indirect steam outlet of last evaporator concatenates steam by pipeline and sprayed
It is connected after penetrating the jetting steam caused valve of pump with the low-pressure steam inlet of steam jet pump, meanwhile, the indirect steam outlet of last evaporator
It is connected after concatenating Mechanical Vapor Compression inlet valve by pipeline with the entrance of Mechanical Vapor Compression；
In the specific implementation of the present invention, as shown in Fig. 2 four structure identicals first evaporator, two effect evaporations
Device, triple effect evaporator and last evaporator use board-like vacuum membrane distillation evaporator, the board-like vacuum membrane distillation evaporation utensil
Body includes heat exchanger fin 28, board-like film 29, end plate 30, shell 31 and condenses water pot 32, and its frame mode is：Thus the plate of secondary arrangement
Formula film, heat exchanger fin, heat exchanger fin and board-like film adjacent one another, place sealing ring and support member, so constitute a film between any two
Block, multiple film blocks stacked adjacent again constitutes membrane stack, and membrane stack two ends are fixed with end plate, and two ends end plate is separately fixed at outer again
On the upper lower wall of shell, wherein, feed liquid passage 33 is constituted between board-like film and heat exchanger fin, is constituted between heat exchanger fin and heat exchanger fin
Steam channel 34 is heated, secondary steam channel 35 is constituted between board-like film and board-like film or board-like film and end plate；
Charging seawater hole, concentrated seawater hole and condensation fresh water hole are offered on the end plate being connected with shell lower wall respectively, each
The also perforate same with end plate of board-like film and heat exchanger fin, perforate coordinates with sealing ring formed respectively charging sea water passage, concentrated seawater to lead to
Road and condensation water flow passage；Membrane stack condensate runner exit, which is set, condenses water pot, and condensate tank top sets fixed gas outlet, bottom
Portion sets condensate outlet；Sealing ring between heat exchanger fin and heat exchanger fin, top drilling steams heating steam channel with heating
Vapour entrance is connected；Bottom opening, heating steam flow channel is connected with condensed water passage.Board-like film and board-like intermembranous sealing ring,
Bottom opening, indirect steam runner is connected with indirect steam outlet；Sealing ring between heat exchanger fin and board-like film, top is opened
Hole, charging sea water passage is connected with material liquid flowing channel；Bottom opening, concentrated seawater passage is connected with material liquid flowing channel.
Preferably：
(1) board-like film is formed by least one porous hydrophobic thin polymer film；
(2) heat exchanger fin is metal sheet or thin polymer film；
(3) Mechanical Vapor Compression is centrifugal compressor, lobed rotor compressor or helical-lobe compressor.
(4) steam jet ejector is that nozzle is fixed or adjustable steam ejector.
In the specific implementation of the present invention, product pump outlet tube, strong brine are discharged into pump discharge pipe and seawater feed pump
Inlet tube it is arranged in parallel, heat exchanger is set on three pipelines, by product water and discharge strong brine in heat transfer give
Into the charging seawater of last evaporator, energy regenerating is carried out, water generation ratio is improved.
Embodiment 1：
When there is outer confession power steam, Mechanical Vapor Compression inlet valve, Mechanical Vapor Compression exhaust steam valve are closed, steam
The jetting steam caused valve of jet pump, steam jet pump air bleeding valve, condenser inlet valve, condenser fresh water drain valve, cooling-water drain valve
Opened with seawater inlet valve.The technological process of desalinization is carried out using said system：
Power steam exports a part of low-pressure steam of injection from the indirect steam of last evaporator by steam jet pump and entered
After jet pump is mixed, the heating steam of first evaporator is entered as heating steam with low-pressure steam for row circulation, power steam
Entrance；
Heat in steam heat exchanger fin is constituted with heat exchanger fin in first evaporator " heating steam channel " and be condensed into fresh water,
Board-like film and the seawater in heat exchanger fin composition " feed liquid passage " are heated simultaneously, and the indirect steam that evaporation of seawater goes out enters through board-like film
Enter " secondary steam channel " that board-like film is constituted with board-like film or board-like film with end plate；The indirect steam of first evaporator is used as two
The heating steam for imitating evaporator repeats above evaporation process, until last evaporator；The indirect steam of last evaporator removes one
Part is circulated outside by steam jet pump injection, and remaining steam is condensed into fresh water into condenser；
Seawater is used as cooling medium by seawater feed pump into condenser；Seawater comes out rear portion from condenser and passed through
Cooling-water drain valve is discharged, and another part is used as seawater charging by seawater inlet valve and is evaporated into last evaporator,
The concentrated water of last evaporator is evaporated as charging by pipeline into triple effect evaporator, repeats such process until head is imitated
Evaporator；
The fixed gas of first evaporator enters 2nd effect evaporator by pipeline, and the fixed gas of 2nd effect evaporator is entered by pipeline
Enter triple effect evaporator, the fixed gas of triple effect evaporator enters last evaporator by pipeline；The fixed gas of last evaporator passes through
Pipeline enters condenser；The fixed gas of condenser passes through vavuum pump discharge system；Valve is all connected with non-condensable gas pipeline to be used to
Adjust pressure；
The fresh water of first evaporator enters the first fresh water flash tank by pipeline, and the fresh water of 2nd effect evaporator is entered by pipeline
Enter the second fresh water flash tank, the fresh water of triple effect evaporator enters the 3rd fresh water flash tank, the fresh water of last evaporator by pipeline
4th fresh water flash tank is entered by pipeline；The fresh water of first fresh water flash tank enters the second fresh water flash tank by pipeline, the
The fresh water of two fresh water flash tanks enters the 3rd fresh water flash tank by pipeline, and the fresh water of the 3rd fresh water flash tank is entered by pipeline
Enter the 4th fresh water flash tank；The fresh water of 4th fresh water flash tank and the fresh water of condenser pass through product water pump output system；
The indirect steam that the steam (vapor) outlet of first fresh water flash tank imports first evaporator by pipeline is used as two effect evaporations
The heating steam of device, the indirect steam that the steam of the second fresh water flash tank imports 2nd effect evaporator by pipeline is used as triple effect evaporation
The heating steam of device, repeats such process until the 4th fresh water flash tank；
The concentrated water of first evaporator enters the first strong brine flash tank by pipeline；The concentrated water of first strong brine flash tank is led to
Piping enters the second strong brine flash tank, and the concentrated water of the second strong brine flash tank is flashed by pipeline into the 3rd strong brine
Tank；The concentrated water of 3rd strong brine flash tank passes through strong brine emptying pump discharge system；
The indirect steam that the steam of first strong brine flash tank imports 2nd effect evaporator by pipeline is used as triple effect evaporator
Heating steam, the indirect steam that the steam of the second strong brine flash tank imports triple effect evaporator by pipeline is used as end effect and evaporates
The heating steam of device, the steam of the 3rd strong brine flash tank imports the indirect steam of last evaporator by pipeline；
Embodiment 2：
When not outer confession power steam, Mechanical Vapor Compression inlet valve, Mechanical Vapor Compression exhaust steam valve are opened, and are steamed
The jetting steam caused valve of vapour jet pump, steam jet pump air bleeding valve, condenser inlet valve and condenser fresh water drain valve are closed, cooling water
Drain valve and seawater inlet valve are adjusted to appropriate aperture.The technological process of desalinization is carried out using said system：
Power steam will be circulated by Mechanical Vapor Compression after the indirect steam compression of last evaporator, as adding
Vapours enters the heating steam inlet of first evaporator；
Heat in steam heat exchanger fin is constituted with heat exchanger fin in first evaporator " heating steam channel " and be condensed into fresh water,
Board-like film and the seawater in heat exchanger fin composition " feed liquid passage " are heated simultaneously, and the indirect steam that evaporation of seawater goes out enters through board-like film
Enter " secondary steam channel " that board-like film is constituted with board-like film or board-like film with end plate；The indirect steam of first evaporator is used as two
The heating steam for imitating evaporator repeats above evaporation process, until last evaporator；
Seawater enters condenser by seawater feed pump, condenser and does not work now, then seawater is entered by seawater
Material valve is evaporated as seawater charging into last evaporator, and the concentrated water of last evaporator enters three as charging by pipeline
Effect evaporator is evaporated, and repeats such process until first evaporator；
The fixed gas of first evaporator enters 2nd effect evaporator by pipeline, and the fixed gas of 2nd effect evaporator is entered by pipeline
Enter triple effect evaporator, the fixed gas of triple effect evaporator enters last evaporator by pipeline；The fixed gas of last evaporator passes through
Pipeline enters condenser；The fixed gas of condenser passes through vavuum pump discharge system；Valve is all connected with non-condensable gas pipeline to be used to
Adjust pressure；
The fresh water of first evaporator enters the first fresh water flash tank by pipeline, and the fresh water of 2nd effect evaporator is entered by pipeline
Enter the second fresh water flash tank, the fresh water that the fresh water of triple effect evaporator enters the 3rd fresh water flash tank last evaporator by pipeline leads to
Piping enters the 4th fresh water flash tank；The fresh water of first fresh water flash tank enters the second fresh water flash tank, second by pipeline
The fresh water of fresh water flash tank enters the 3rd fresh water flash tank by pipeline, and the fresh water of the 3rd fresh water flash tank enters the by pipeline
Four fresh water flash tanks；The fresh water of 4th fresh water flash tank passes through product water pump output system；
The indirect steam that the steam (vapor) outlet of first fresh water flash tank imports first evaporator by pipeline is used as two effect evaporations
The heating steam of device, the indirect steam that the steam of the second fresh water flash tank imports 2nd effect evaporator by pipeline is used as triple effect evaporation
The heating steam of device, repeats such process until the 4th fresh water flash tank；
The concentrated water of first evaporator enters the first strong brine flash tank by pipeline；The concentrated water of first strong brine flash tank is led to
Piping enters the second strong brine flash tank, and the concentrated water of the second strong brine flash tank is flashed by pipeline into the 3rd strong brine
Tank；The concentrated water of 3rd strong brine flash tank passes through strong brine emptying pump discharge system；
The indirect steam that the steam of first strong brine flash tank imports 2nd effect evaporator by pipeline is used as triple effect evaporator
Heating steam, the indirect steam that the steam of the second strong brine flash tank imports triple effect evaporator by pipeline is used as end effect and evaporates
The heating steam of device, the steam of the 3rd strong brine flash tank imports the indirect steam of last evaporator by pipeline；
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair
Bright, within the spirit and principles of the invention, any modifications, equivalent substitutions and improvements done etc. should be included in the present invention
Protection domain within.
Claims (9)
1. a kind of Multi-effect plate type film distilling seawater desalination system based on both vapor compression, including the spray of Mechanical Vapor Compression, steam
Penetrate pump, vavuum pump, seawater feed pump, product water pump, strong brine emptying pump, condenser, four structure identical first evaporators,
2nd effect evaporator, triple effect evaporator, last evaporator, four the first fresh water of structure identical flash tanks, the second fresh water flash tank,
3rd fresh water flash tank, the 4th fresh water flash tank, three the first strong brine of structure identical flash tanks, the flash distillations of the second strong brine
Tank, the 3rd strong brine flash tank, steam jet pump injecting valve, steam jet pump exhaust steam valve, Mechanical Vapor Compression inlet valve, machine
Tool vapour compression machine exhaust steam valve, condenser inlet valve, condenser fresh water drain valve, cooling-water drain valve and seawater inlet valve,
The higher pressure steam inlet of steam jet pump is connected with power steam pipeline, it is characterised in that：
Wherein, the outlet of the Mechanical Vapor Compression and the outlet of steam jet pump concatenate mechanical vapour pressure by pipeline respectively
Tandem after contracting machine exhaust steam valve and steam jet pump air bleeding valve, is then connected with the heating steam inlet of first evaporator；Head effects are steamed
Evaporator vapo(u)r outlet is connected by the heating steam inlet of pipeline and 2nd effect evaporator, two effects, the company of triple effect evaporator
Connect that mode is identical with first evaporator, the indirect steam outlet of last evaporator by after pipeline concatenation condenser inlet valve with it is cold
The steam inlet connection of condenser, also, the indirect steam outlet of last evaporator concatenates the steaming of steam jet pump injection by pipeline
It is connected after steam valve with the low-pressure steam inlet of steam jet pump, also, the indirect steam outlet of last evaporator passes through pipeline string
Connect and be connected after Mechanical Vapor Compression inlet valve with the entrance of Mechanical Vapor Compression；
Wherein, the seawater feed pump is connected by the seawater inlet of pipeline and condenser, and the seawer outlet of condenser is connected with
Cooling-water drain valve and seawater inlet valve, seawater inlet valve are connected by the seawater feed entrance of pipeline and last evaporator, end
The concentrated water outlet for imitating evaporator is connected by the seawater feed entrance of pipeline and triple effect evaporator, repeats the seawater of last evaporator
Feed pipe attachment structure is until first evaporator；
Wherein, the fixed gas outlet of the first evaporator is connected by the fixed gas entrance of pipeline and 2nd effect evaporator, two effects,
The fixed gas connected mode of triple effect evaporator is identical with first evaporator, the outlet of the fixed gas of last evaporator by pipeline with it is cold
The fixed gas entrance connection of condenser；The fixed gas outlet of condenser is connected by pipeline with vavuum pump；The fresh water of first evaporator
Outlet is connected by pipeline with the fresh water entrance of the first fresh water flash tank, equally, and the fresh water of two effects, triple effect and last evaporator goes out
Mouth is connected with corresponding second, third and the 4th fresh water flash tank respectively, meanwhile, the water outlet of the first fresh water flash tank passes through
Pipeline is connected with the fresh water entrance of the second fresh water flash tank, and the water outlet of second, third fresh water flash tank uses identical connection
Mode, the water outlet of the 4th fresh water flash tank is connected by pipeline with product water pump, also, the water outlet of condenser passes through
Fresh water outlet pipe tandem after pipeline concatenation condenser fresh water drain valve with the 4th fresh water flash tank；
Wherein, the steam (vapor) outlet of the first fresh water flash tank is exported by the indirect steam of pipeline and first evaporator and connected, and second
The steam (vapor) outlet of fresh water flash tank is exported by the indirect steam of pipeline and 2nd effect evaporator and connected, equally, the three, the 4th fresh water
The steam (vapor) outlet of flash tank uses identical connected mode；The concentrated water outlet of first evaporator by pipeline successively by first, the
Two and the 3rd strong brine flash tank is connected in series, and the concentrated water outlet of the 3rd strong brine flash tank passes through pipeline and strong brine emptying pump
Connection, meanwhile, the steam (vapor) outlet of first, second and third strong brine flash tank steams with corresponding two effects, triple effect and end effect respectively
Evaporator vapo(u)r outlet connection.
2. the Multi-effect plate type film distilling seawater desalination system according to claim 1 based on both vapor compression, it is characterised in that：
Four structure identicals evaporator, four structure identical fresh water flash tanks and the identical strong brine flash tank of three structures are equal
Scale compression that can be according to seawater desalination system or expansion.
3. the Multi-effect plate type film distilling seawater desalination system according to claim 1 based on both vapor compression, four knots
Structure identical first evaporator, 2nd effect evaporator, triple effect evaporator and last evaporator use typical board-like evaporation structure,
It is characterized in that：Board-like film and heat exchanger fin and in particular order arranged are embedded in the plate-type evaporator and is constituted board-like true
Empty Membrane Materials evaporation structure, board-like film, heat exchanger fin, heat exchanger fin and the plate of the board-like vacuum membrane distillation evaporator thus secondary arrangement
Formula film adjacent one another successively, places sealing ring and support member between any two, so constitutes a film block, multiple film blocks adjacent heap again
Put, sealing ring and support member are placed between module and module, membrane stack is so constituted, membrane stack two ends are fixed with end plate, membrane stack
Sealing ring and support member are placed between end plate, two ends end plate is separately fixed on the upper lower wall of shell again, wherein, in board-like film
Feed liquid passage is constituted between heat exchanger fin, between heat exchanger fin and heat exchanger fin constitute heating steam channel, board-like film with it is board-like
Secondary steam channel is constituted between film and board-like film and end plate.
4. the Multi-effect plate type film distilling seawater desalination system according to claim 3 based on both vapor compression, it is characterised in that：
As one kind preferably, the board-like film is formed by porous hydrophobic thin polymer film；
5. the Multi-effect plate type film distilling seawater desalination system according to claim 3 based on both vapor compression, it is characterised in that：
Preferably, the heat exchanger fin is metal sheet or thin polymer film；
6. the Multi-effect plate type film distilling seawater desalination system according to claim 1 based on both vapor compression, it is characterised in that：
As preferred disposition, the Mechanical Vapor Compression is centrifugal compressor, lobed rotor compressor or helical-lobe compressor.
7. the Multi-effect plate type film distilling seawater desalination system according to claim 1 based on both vapor compression, it is characterised in that：
As preferred disposition, the steam jet ejector is that nozzle is fixed or adjustable steam ejector.
8. the Multi-effect plate type film distilling seawater desalination system according to claim 1 based on both vapor compression, it is characterised in that：
By the inlet tube parallel arranged of the product pump outlet tube, strong brine discharge pump discharge pipe and seawater feed pump, in three pipes
Heat exchanger is set on road, the heat transfer in product water and the strong brine of discharge is given to the charging seawater for entering last evaporator,
Carry out energy regenerating.
9. the Multi-effect plate type film distilling seawater desalination system according to claim 1 based on both vapor compression, it is characterised in that：
Valve is serially connected with the non-condensable gas pipeline.
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| CN107758777A (en) * | 2017-11-23 | 2018-03-06 | 大连海事大学 | A kind of marine seawater desalination system of high waste heat utilization |
| CN107963681A (en) * | 2017-10-18 | 2018-04-27 | 楚天华通医药设备有限公司 | A kind of multistage steam recompresses formula distillation machine |
| CN108211801A (en) * | 2018-03-07 | 2018-06-29 | 北京天地人环保科技有限公司 | A kind of multiple-effect distillation device, system and method |
| CN108246105A (en) * | 2018-03-08 | 2018-07-06 | 中国科学院理化技术研究所 | A kind of vacuum type membrane distillation system |
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