CN103071388A - Steam thermocompression decompression membrane distillation apparatus - Google Patents

Steam thermocompression decompression membrane distillation apparatus Download PDF

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Publication number
CN103071388A
CN103071388A CN201210396753XA CN201210396753A CN103071388A CN 103071388 A CN103071388 A CN 103071388A CN 201210396753X A CN201210396753X A CN 201210396753XA CN 201210396753 A CN201210396753 A CN 201210396753A CN 103071388 A CN103071388 A CN 103071388A
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CN
China
Prior art keywords
side
steam
outlet
preheater
heat exchanger
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Application number
CN201210396753XA
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Chinese (zh)
Inventor
解奥
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解奥
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Priority to CN201210396753XA priority Critical patent/CN103071388A/en
Publication of CN103071388A publication Critical patent/CN103071388A/en

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Abstract

The invention relates to a steam thermocompression decompression membrane distillation apparatus. Driving steam is connected to an inlet of a stem thermal compressor; the steam thermal compressor is connected to a transmission side of a vacuum membrane distillation device; an outlet of the steam thermal compressor is connected with a steam inlet of a heating side of a heat exchanger; an outlet of a heating side of the heat exchanger is connected to an inlet of a first heating side of a preheater; an outlet of a condensation side of a condenser is also connected to the inlet of the first heating side of the preheater through a condensate pump; a membrane distillation concentrated liquid outlet is connected to an inlet of a second heating side of the preheater; a heated material inlet of the preheater is connected to a raw material pump; heated material liquid outside of the preheater is connected to an inlet of a raw material liquid side of the condenser; an outlet of the raw material liquid side of the condenser is connected with an inlet of a heated side of the heat exchanger; and a heated side outlet of the heat exchanger is connected to a membrane distillation raw material liquid inlet. The invention saves energy, has the characteristics of simple apparatus, reliable operation, energy saving and environment-friendliness, and provides a membrane distillation process with relatively simple process, equipment and operation.

Description

Steam heat compression pressure-reduction distillation device

Technical field

The invention belongs to the membrane separation technique field, relate to pressure reducing film distillation, especially a kind of steam heat compression pressure-reduction distillation device.

Background technology

The film distillation is the process that realizes separating substances take the steam pressure difference of hydrophobic membrane both sides volatile component as motive force, and volatile component diffuses through fenestra with the form of gaseous molecular, in the direct condensation of opposite side quilt or the extraction external condensation of film.

Film distillation can realize still-process under lower negative pressure and lower solution temperature, to the rejection of the non-volatile components such as inorganic salts, large molecule near 100%.Distillation device adopts flat high molecular hydrophobic film or hollow fiber polymer hydrophobic membrane, and loading density is large, and antiseptic property is good, the device fabrication cost is low, and can process high-concentration waste water, therefore day by day be subject to researcher's attention, become one of developing direction of film separation and water technology.But film distillation is phase transition process, and outer heat input or material cooling heat release make the volatile component gasification, and then realize the separation of material, need to consume certain energy.At present, see through the directly condensation under environmental condition of volatile component of high molecular hydrophobic film in the film still-process, its condensation latent heat is not utilized, and utilization rate low in calories becomes the obstacle that hinders the film distillation technology extensive use.

By retrieval, find following two pieces of publication documents:

1, a kind of air-blowing vacuum distillation device and method (CN101664642) comprise the following parts that connect successively: at the tank of former water side setting; Be connected in the water pump on the tank, the former water in the suction tank; Be arranged at the compressed air inlet in water pump downstream, be used for entering low-pressure compressed air to former drum; Air and liquid mixer is used for mixing compressed air and liquid, forms gas-liquid mixture fluid; The hydrophobic membrane assembly is processed gas-liquid mixture fluid; At hydrophobic membrane assembly water outlet side negative pressure generating device is set.The present invention blasts the compressed-air actuated while in the former water side of film, applies negative pressure at the water outlet side of film.Under the swabbing action of negative pressure, water vapour sees through hydrophobic membrane with the Partial shrinkage air.

2, a kind of method and device (CN101797479A) that utilizes the live (open) steam compressing hot pump to carry out vacuum membrane distillation, by adopting a vapour compression machine directly the steam of membrane module through side to be compressed, with the high temperature and high pressure steam after the compression successively by a heater and a preheater, simultaneously with raw material also by heater and preheater.In this process, utilize temperature and the raw material of this steam to carry out heat exchange, namely realize condensation, the cooling release heat of steam, thereby do not need extra refrigeration working medium and evaporimeter thereof and condenser, and utilize negative pressure that vapour compression machine forms when sucking steam as vacuum source, thereby save vavuum pump; Simultaneously, will carry out heat exchange by a preheater and raw material from membrane module concentrate out.

Through technical comparison, second piece of publication document and present patent application have similar part, but technical scheme is very not identical.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art part, a kind of steam heat compression pressure-reduction distillation device is provided, this apparatus structure is simple, and is reliable, and efficiency of utilization is high, and operating cost is low.

The present invention is realized by following technical proposals:

A kind of steam heat compression pressure-reduction distillation device, comprise the steam heat compressor reducer, the vacuum membrane distillation device, preheater, condenser, heat exchanger, raw material tank, feedstock pump and condensate pump, it is characterized in that: drive steam and connect the import of steam heat compressor reducer, this steam heat compressor reducer connects the vacuum membrane distillation device and sees through side, the outlet of steam heat compressor reducer links to each other with heat exchanger heated side steam inlet, the first heated side import links to each other the outlet of heat exchanger heated side with preheater, the condenser condenses side outlet also links to each other with preheater the first heated side import by condensate pump, the second heated side import links to each other the outlet of membrane distillation concentration liquid with preheater, preheater is heated liquor inlet and links to each other with feedstock pump, and feedstock pump connects raw material tank; Preheater is heated material liquid outlet, and side-entrance links to each other with the condenser material liquid, and condenser material liquid side outlet is heated side-entrance with heat exchanger and links to each other, and heat exchanger is heated side outlet and links to each other with the import of film distillating material liquid.

And material liquid directly links to each other with the side-entrance of condenser material liquid by bypass duct, enters the vacuum membrane distillation device after condenser and twice heat exchange of heat exchanger.

And described vacuum membrane distillation device adopts polypropylene porous film, aperture 0.2 μ m, effective film area 0.2m 2

Advantage of the present invention and good effect are:

1, the present invention utilizes the input steam of certain pressure, and by a steam heat compressor reducer, the vapor portion that the film distillation is seen through side is extracted out, and recycling steam latent heat is kept the vacuum condition that the film distillation sees through side simultaneously, has save the devices such as vavuum pump.

2, the present invention utilizes the input steam of certain pressure, by a steam heat compressor reducer, film distillation is seen through the part both vapor compression of side, delivers to heat exchanger after promoting temperature, the film distillation delivers to condenser through all the other steam of side and material liquid carries out exchange heat, the temperature difference of steam utilization self and material liquid is carried out exchange heat with material liquid in heat exchanger, steam-condensation, cooling release heat, the material liquid temperature gets a promotion, and realizes seeing through the recycling of side steam heat.

3, the present invention utilizes the temperature of film still-process concentrate and film distillation charging to carry out exchange heat in preheater, promotes the feeding liquid temperature, reduces the heat that the discharging concentrate carries, and improves heat utilization efficiency.

4, energy savings of the present invention has that device is simple, an operation, reliable, energy-conservation and environmental protection characteristics, is all relatively simple film still-process of a kind of technique, equipment and operation.

Description of drawings

Fig. 1 is apparatus structure schematic diagram of the present invention.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing and by specific embodiment, and following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.

A kind of steam heat compression pressure-reduction distillation device, comprise that steam heat compressor reducer 3, steam heat compression pressure-reduction distillation device 2(is hereinafter to be referred as the vacuum membrane distillation device), preheater 8, condenser 4, heat exchanger 1, raw material tank 11, feedstock pump 10 and condensate pump 5, the vacuum membrane distillation device adopts polypropylene porous film, aperture 0.2 μ m, effective film area 0.2m 2Preheater, condenser, heat exchanger, raw material tank, feedstock pump and condensate pump are prior art products.

The concrete structure of vacuum membrane distillation device and connection are referring to Fig. 1, drive steam and connect the import of steam heat compressor reducer, this steam heat compressor reducer connects the vacuum membrane distillation device and sees through side, see through the part steam of side with the aspiration vacuum distillation device, recycling steam latent heat is kept the vacuum condition that the film distillation sees through side simultaneously; A part of steam that the vacuum membrane distillation device sees through side enters the steam heat compressor reducer, and all the other steam that the film distillation sees through side enter the condenser condenses side.The outlet of steam heat compressor reducer links to each other with heat exchanger heated side steam inlet, 6 imports link to each other the outlet of heat exchanger heated side with preheater the first heated side, the condenser condenses side outlet also links to each other with preheater the first heated side import by condensate pump, 7 imports link to each other the outlet of membrane distillation concentration liquid with preheater the second heated side, preheater is heated liquor inlet and links to each other with feedstock pump, and feedstock pump connects raw material tank; Preheater is heated material liquid outlet, and side-entrance links to each other with the condenser material liquid, and condenser material liquid side outlet is heated side-entrance with heat exchanger and links to each other, and heat exchanger is heated side outlet and links to each other with the import of film distillating material liquid.

If the material liquid initial temperature is higher, also can directly link to each other with the side-entrance of condenser material liquid by bypass duct 9 without preheater, after condenser and twice heat exchange of heat exchanger, enter the vacuum membrane distillation device.

Operation principle of the present invention is:

Steam heat compressor reducer outlet steam sees through respectively condensation in heat exchanger and condenser, the cooling of all the other steam of side with the film distillation that does not enter the steam heat compressor reducer, heat is reached be heated feed liquid.The steam condensate that membrane distillation concentration liquid and heat exchanger, condenser condenses side are discharged promotes the temperature of material liquid through two passages and material liquid heat exchange; Membrane distillation concentration liquid after the cooling is discharged system, and steam condensate is as pure water collection.Through preheater, after three heat exchange of condenser and heat exchanger, the material liquid with higher temperature enters the vacuum membrane distillation device, utilizes the steam pressure difference of hydrophobic membrane both sides, realizes the separation of material.

Concrete case:

Device drives steam and comes from boiler as being installed on the skid.Contour size of the unit(s) is: 1000mm * 500mm * 1000mm.

Seawater (salt content 35000mg/L) enters the vacuum membrane distillation device through preheater after three heat exchange of condenser and heat exchanger, and the vacuum membrane distillation device adopts polypropylene porous film, aperture 0.2 μ m, effective film area 0.2m 2Driving steam pressure from boiler is 0.3MPa, and flow is 1.765kg/h; The material liquid temperature that enters the vacuum membrane distillation device is 80 ℃, and the film distillation vacuumizes side vacuum 0.07MPa, and water generation ratio is 4.

Claims (2)

1. a steam heat compresses pressure-reduction distillation device, comprise the steam heat compressor reducer, the vacuum membrane distillation device, preheater, condenser, heat exchanger, raw material tank, feedstock pump and condensate pump, it is characterized in that: drive steam and connect the import of steam heat compressor reducer, this steam heat compressor reducer connects the vacuum membrane distillation device and sees through side, the outlet of steam heat compressor reducer links to each other with heat exchanger heated side steam inlet, the first heated side import links to each other the outlet of heat exchanger heated side with preheater, the condenser condenses side outlet also links to each other with preheater the first heated side import by condensate pump, the second heated side import links to each other the outlet of membrane distillation concentration liquid with preheater, preheater is heated liquor inlet and links to each other with feedstock pump, and feedstock pump connects raw material tank; Preheater is heated material liquid outlet, and side-entrance links to each other with the condenser material liquid, and condenser material liquid side outlet is heated side-entrance with heat exchanger and links to each other, and heat exchanger is heated side outlet and links to each other with the import of film distillating material liquid.
2. steam heat according to claim 1 compresses pressure-reduction distillation device, it is characterized in that: material liquid directly links to each other with the side-entrance of condenser material liquid by bypass duct, enters the vacuum membrane distillation device after condenser and twice heat exchange of heat exchanger.3, steam heat compression pressure-reduction distillation device according to claim 1, it is characterized in that: described vacuum membrane distillation device adopts polypropylene porous film, aperture 0.2 μ m, effective film area 0.2m 2
CN201210396753XA 2012-10-18 2012-10-18 Steam thermocompression decompression membrane distillation apparatus CN103071388A (en)

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Application Number Priority Date Filing Date Title
CN201210396753XA CN103071388A (en) 2012-10-18 2012-10-18 Steam thermocompression decompression membrane distillation apparatus

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105084445A (en) * 2015-08-13 2015-11-25 大唐环境产业集团股份有限公司 Efficient membrane distillation method and device
CN108147485A (en) * 2016-12-04 2018-06-12 中国科学院大连化学物理研究所 A kind of fresh-water generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1396120A (en) * 2001-07-13 2003-02-12 清华大学 Membrane distillation type water treating apparatus using solar energy or afterheat
US20060070867A1 (en) * 2003-02-21 2006-04-06 Shiro Ikeda Method for concentrating water-soluble organic material
CN101797479A (en) * 2010-02-25 2010-08-11 北京理工大学 Method and device for distillating vacuum film by directly utilizing vapor compression heat pump
CN102125805A (en) * 2010-01-12 2011-07-20 天津海之凰科技有限公司 Vapor compression membrane distillation device and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1396120A (en) * 2001-07-13 2003-02-12 清华大学 Membrane distillation type water treating apparatus using solar energy or afterheat
US20060070867A1 (en) * 2003-02-21 2006-04-06 Shiro Ikeda Method for concentrating water-soluble organic material
CN102125805A (en) * 2010-01-12 2011-07-20 天津海之凰科技有限公司 Vapor compression membrane distillation device and method
CN101797479A (en) * 2010-02-25 2010-08-11 北京理工大学 Method and device for distillating vacuum film by directly utilizing vapor compression heat pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105084445A (en) * 2015-08-13 2015-11-25 大唐环境产业集团股份有限公司 Efficient membrane distillation method and device
CN108147485A (en) * 2016-12-04 2018-06-12 中国科学院大连化学物理研究所 A kind of fresh-water generator

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Application publication date: 20130501