CN104190259A - Multi-effect decompression membrane distillation method and device thereof - Google Patents
Multi-effect decompression membrane distillation method and device thereof Download PDFInfo
- Publication number
- CN104190259A CN104190259A CN201410479625.0A CN201410479625A CN104190259A CN 104190259 A CN104190259 A CN 104190259A CN 201410479625 A CN201410479625 A CN 201410479625A CN 104190259 A CN104190259 A CN 104190259A
- Authority
- CN
- China
- Prior art keywords
- water
- composition element
- film distillation
- feed liquid
- distillation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention provides a multi-effect decompression membrane distillation method and a device thereof. The device comprises multiple stages of membrane distillation combination elements, a circulating water pump, a vacuum pump, a circulating heating water tank, a heat exchanger, a water producing pump, a gas-liquid separation container and a connecting pipe, wherein a hydrophobic membrane with a top-down vertical flow path and a heat exchange pipe with a bottom-up vertical flow path are arranged in each membrane distillation combination element; feed liquid connecting pipes and water producing communicating pipes are arranged among the membrane distillation combination elements. The method comprises the following steps: when feed liquid flows past the flow path of the hydrophobic membrane of the membrane distillation combination elements, the feed liquid is subjected to membrane distillation under the action of negative pressure of a shell side; evaporated water vapor enters the shell side and is in contact with the pipe wall of the heat exchange pipe, heat of phase transition is released to be condensed to form membrane distillation producing water; after being evaporated and cooled, the unevaporated feed liquid in the flow path of the hydrophobic membrane flows past the heat exchange pipe; after absorbing heat for temperature rise, the feed liquid enters the flow path of the hydrophobic membrane of the next-stage membrane distillation combination element; by processing step by step, the feed liquid is concentrated step by step and then is discharged. Feed liquid concentration and full utilization of vaporization heat of phase transition are realized synchronously, and multi-effect decompression membrane distillation is completed.
Description
Technical field
The present invention relates to membrane distillation method and device thereof, relate in particular to a kind of decompression multiple-effect membrane distillation method and device thereof for purifying water process, chemical separating concentrated liquid and water desalination.
Background technology
Film distillation technology is the new liquid isolation technics that membrane technology combines with traditional distillation technique, with common evaporimeter comparison, a feature the most significant of film distillation is that the effective disengagement area in unit volume is large, thereby can make device operation efficiently in the evaporation process of normal pressure, lower temperature, and equipment adopts plastic material, has avoided the etching problem of metal material under high salinity.Compare with counter-infiltration, film distillation is hot driving process, and operating pressure is low, so cost of equipment is also low, and the operating pressure of film distillation is low, and salt rejection rate is high, and film pollution level is light, to pretreated require low.Film distillation is a kind of employing dewatering microporous film, the poor film separation process as mass transfer driving force of the film both sides steam pressure of take.Under the driving of the steam pressure difference of microporous hydrophobic membrane both sides, water vapour is condensed into liquid separation process from heated feed liquid one side again through hydrophobic membrane.Hydrophobicity due to film, only have water vapour can see through fenestra, feed liquid and the Nonvolatile solute being dissolved in wherein cannot pass fenestra, so film still-process can be realized 100% remove to ion, large molecule, colloid, cell and other non-volatile matter in theory.Microporous hydrophobic membrane plays the support shielding action between two-phase in film still-process.In the process of film distillation, there are two kinds of processes of heat and mass transfer simultaneously, temperature difference polarization also can produce with temperature difference polarization phenomena simultaneously, thereby the process of film distillation is produced to adverse influence.
Film still-process can the high aqueous solution of concentration for the treatment of, as long as film both sides maintain the suitable temperature difference, film still-process just can carry out, and can utilize solar energy, underground heat, hot spring, waste heat of plant and the warm cheap energy such as industrial wastewater.
It is low that film distillation technology has operating pressure, can obtain 99.99% salt rejection rate and under excellent operation condition higher than the water flux of counter-infiltration, shown that it substitutes (extensive pure water preparation) or the supplementary technology application potential of (as for boats and ships drinking water etc.) as reverse osmosis technology, reducing investment and operating cost, improve the utilization rate of water, reduce concentrated water discharge aspect, be expected to obtain significant economic benefit and social benefit.
At present develop five kinds of common film distillation procedure modes, had direct contact membrane distillation, gap membrane distillation, gas to sweep the distillation of formula film, pressure reducing film distillation and absorbing film distillation.But up to now, all there is the problems such as energy consumption is high, hydrophobic membrane is difficult to be dried after soaking in film distillation technology.Although as simple in direct contact membrane distillation process equipment, because Cooling and Heat Source directly contacts, make equipment operation energy consumption higher; Although pressure reducing film distillation membrane flux is larger, higher to hydrophobic membrane requirement of strength, and easily produce hydrophobic membrane hydrophiling leakage problems; Gap membrane distillation and air-flow sweeping type film distill that flux is lower; There is the problems such as recycling of absorbent in absorbing film distillation.
In film still-process, the heat of transformation of steam is about 2600kJ/kg, much larger than specific heat of water 4kJ/kg.K.Therefore, film still-process needs a large amount of additional cooling waters to carry out the steam of condensation film distillation, if using feed liquid as cooling water, the steam producing in film still-process is directly exchanged by heat exchanger and feed liquid, as gap membrane distillation, feed liquid can not all absorb steam latent heat, in order to improve water generation ratio, must reduce the temperature difference between hydrophobic face and heat exchange wall, so cause flux of membrane distillation low.Therefore, the heat of transformation of steam in reclamation film still-process, uses it for the heating to feed liquid in a suitable manner, is that film distillation technology is realized one of key issue that industrial applications need to solve.
Summary of the invention
Main purpose of the present invention is to overcome the above-mentioned shortcoming that existing product exists, and provide a kind of decompression multiple-effect membrane distillation method and device thereof, use for reference gap membrane distillation principle, by the water vapour condensation in film still-process and the coupling of feed liquid heating process, the heat of transformation of steam in reclamation film still-process, utilize liquid pressure-reducing multiple-effect evaporation principle, realize the evaporative cooling of feed liquid, the absorption heat of transformation heats up, evaporative cooling again, again absorbing the heat of transformation heats up multiple stage circulation thus, synchronously realize concentrating of feed liquid and making full use of of evaporative phase-change heat, thereby complete decompression multiple-effect film still-process of the present invention.
The object of the invention is to be realized by following technical scheme.
The present invention's multiple-effect distillation device that reduces pressure, is characterized in that, comprises Using Multistage Membranes distillation composition element, water circulating pump, vavuum pump, circulating-heating tank, heat exchanger, product water pump, gas-liquid separation container and tube connector each other; The hydrophobic membrane of vertical stream from top to bottom and the heat exchanger tube of vertical stream are from bottom to top set in this film distillation composition element; Between each film distillation composition element, be provided with feed liquid tube connector and produce water communicating pipe.
Aforesaid decompression multiple-effect distillation device, wherein, described water circulating pump is arranged on the feed liquid tube connector between circulating-heating tank delivery port and first order film distillation composition element water inlet; Between circulating-heating tank water inlet and final stage film distillation composition element heat exchanger tube delivery port, be provided with feed liquid tube connector;
This final stage film distillation composition element is connected water communicating pipe by film distillation product with external heat exchanger tube pass; External heat exchanger shell pass import is connected with raw water tubes, and shell side outlet is connected by tube connector and the import of final stage film distillation composition element heat exchanger tube; Final stage film distillation composition element is provided with concentrated water drainage outlet connection concentrated water drainage and goes out pipe;
Described gas-liquid separation container is connected with vavuum pump with external heat exchanger tube pass outlet water communicating pipe by producing respectively, and is provided with product mouth of a river junctional membrane distillation product water discharge pipe, and this film distillation is produced water discharge pipe and is provided with product water pump.
Aforesaid decompression multiple-effect distillation device, wherein: described Using Multistage Membranes distillation composition element is 2 to 50.
Aforesaid decompression multiple-effect distillation device, wherein: the liquid level of importing and exporting product water communicating pipe in described every one-level film distillation composition element shell side exists difference in height.
Aforesaid decompression multiple-effect distillation device, wherein: describedly every three, to the feed liquid tube connector between Pyatyi film distillation composition element, a booster pump is set.
Aforesaid decompression multiple-effect distillation device, wherein: the described the reciprocal the 2nd or 3 grades of films distillation composition element material liquid outlet positions a bypass is set.
The present invention's multiple-effect membrane distillation technique method that reduces pressure, is characterized in that: comprise when feed liquid flows through the hydrophobic membrane stream in film distillation composition element, under the suction function of shell side, film distillation occurs; The steam evaporating enters shell side, contacts with heat exchanger tube tube wall, discharges the heat of transformation and is condensed, and becomes film distillation and produces water; Unevaporated feed liquid in hydrophobic membrane stream, is evaporated after cooling, flows through heat exchanger tube, and heat absorption heats up, and then enters the hydrophobic membrane stream of next stage film distillation composition element; Carry out step by step thus, make feed liquid concentrated rear discharge step by step.
Aforesaid decompression multiple-effect membrane distillation method, wherein: also comprise that former water produces after the waste heat of water through external heat exchanger absorbing film distillation, directly supplements the heat exchange tube inlet that enters final stage film distillation composition element.
Aforesaid decompression multiple-effect membrane distillation method, wherein: water is produced in the film distillation in described film distillation composition elements at different levels, by being communicated with successively communicating pipe, finally by producing water pump, extracts out; In every grade of film distillation composition element, produce import and export liquid level difference and the vavuum pump of water communicating pipe, realize the vacuum degree control of film distillation composition element shell sides at different levels; In described every one-level film distillation composition element, unevaporated feed liquid in hydrophobic membrane stream, being evaporated cooling extent is 5 to 20 ℃.
Aforesaid decompression multiple-effect membrane distillation method, wherein: described feed liquid is the former water through heating, this former water is the hot water of running water, seawater, cooling system discharge or needs chemical products solution concentrated or that desalination is processed.
The present invention uses for reference gap membrane distillation principle, by the water vapour condensation in film still-process and the coupling of feed liquid heating process, the heat of transformation of steam in reclamation film still-process, utilize liquid pressure-reducing multiple-effect evaporation principle, realize the evaporative cooling of feed liquid, the absorption heat of transformation heats up, evaporative cooling again, again absorbing the heat of transformation heats up multiple stage circulation thus, synchronously realize concentrating of feed liquid and making full use of of evaporative phase-change heat, thereby complete decompression multiple-effect film still-process, reach under high water generation ratio condition, keep higher flux of membrane distillation, realize the distillation of high-efficiency low energy consumption film, the effect that heat recovery rate is high.
The reduce pressure operation principle of multiple-effect membrane distillation method of the present invention: from circulating-heating tank feed liquid out, through water circulating pump, send in the hydrophobic membrane stream in first order film distillation composition element, the hydrophobic membrane of flowing through from top to bottom stream, under the suction function of first order film distillation composition element shell side, the distillation of generation film, the steam evaporating sees through the fenestra of hydrophobic membrane, enter first order film distillation composition element shell side, then contact with heat exchange tube wall, the feed liquid in heating heat exchanger tube, self is condensed steam, discharge the heat of transformation, become the distillation of first order film and produce water.Unevaporated feed liquid in hydrophobic membrane stream, is evaporated after cooling, in first order film distillation composition element, flow through heat exchanger tube from bottom to top, because its temperature is lower than the steam temperature outside the heat exchanger tube of par height and position, thereby heat absorption heats up, then, flow out first order film distillation composition element.By film distillation composition element of the present invention, design, the feed temperature flowing out from first order film distillation composition element, only slightly lower than the inlet temperature that enters first order film distillation composition element.
The feed liquid flowing out from first order film distillation composition element, continues to enter second level film distillation composition element, same, the hydrophobic membrane of flowing through from top to bottom stream, under the suction function of second level film distillation composition element shell side, there is film distillation, the steam evaporating sees through the fenestra of hydrophobic membrane, enter second level film distillation composition element shell side, then contact with heat exchange tube wall, the feed liquid in heating heat exchanger tube, self is condensed steam, discharge the heat of transformation, become second level film distillation and produce water.Unevaporated feed liquid in hydrophobic membrane stream, is evaporated after cooling, in second level film distillation composition element, flow through heat exchanger tube from bottom to top, because its temperature is lower than the steam temperature outside the heat exchanger tube of par height and position, thereby heat absorption heats up, then, flow out second level film distillation composition element.The feed temperature flowing out from second level film distillation composition element, only slightly lower than the inlet temperature that enters second level film distillation composition element.
Carry out step by step thus, feed liquid is lowered the temperature step by step, and is concentrated.
Former water produces after the waste heat of water through external heat exchanger absorbing film distillation, directly supplements the heat exchange tube inlet that enters final stage film distillation composition element.
Film distillation in first order film distillation composition element is produced water by entering the second level film distillation composition element shell side communicating pipe, film distillation in second level film distillation composition element is produced water by entering the third level film distillation composition element shell side communicating pipe, by that analogy, finally enter in final stage film distillation composition element, by producing water pump, extract out again, after external heat exchanger and former water heat exchange, by gas-liquid separation container, connect respectively water producing pipe and vavuum pump.In every grade of film distillation composition element, the import liquid level of producing water communicating pipe all will be higher than the outlet liquid level of producing water communicating pipe.The water producing pipe setting of similar low-temperature multi-effect vaporising device.By producing import and export liquid level difference and the vavuum pump of water communicating pipe in every grade of film distillation composition element, arrange, realize the vacuum step of film distillation composition element shell sides at different levels and control.
According to actual needs, Using Multistage Membranes distillation composition element can be set, but at least need two-stage.Can by suitable progression, arrange for 2 to 50 grades, can take into account and obtain high water generation ratio and high flux of membrane distillation.
Because feed liquid pipeline transport path is longer, need to distill the one or more booster water pumps of the suitable position configuration of composition element inter-stage at film.Generally at a booster water pump of 3 to 5 grades of film distillation composition element inter-stage configurations.
In order to improve the overall efficacy of device, can bypass be set in inverse the 2nd or 3 grades of films distillation composition element material liquid outlet positions, make the feed liquid of part higher temperature directly return to heating water tank, another part feed liquid still enters next stage film distillation composition element, and feed liquid is further concentrated.At final stage film distillation composition element, the feed liquid after film distillation, 30 go out system to 100% as concentrated water drainage, after all the other feed liquids and the new former water hybrid cooling supplementing, enter heat exchanger tube.
The cold and hot end of film still-process, hydrophobic membrane temperature difference is larger, and meanwhile, vacuum is higher, and flux of membrane distillation is larger.Technique, has ensured and in every one-level film still-process, has all had higher cold and hot end temperature difference thus, meanwhile, by vacuum degree control, can obtain higher flux of membrane distillation.By multistage setting, realize the abundant recovery of the film distillation heat of transformation, thereby can obtain higher water generation ratio.Overcome in existing gap membrane distil process, for improving water generation ratio, can only reduce the cold and hot end temperature difference in every one-level film still-process, cause the problem that flux of membrane distillation is lower.
Heat exchanger tube can adopt metal material, also can adopt plastic hollow fiber, as polypropylene, Kynoar, polytetrafluoroethylene (PTFE) hollow fibre material etc.
The hydrophobic membrane that the present invention uses can be hollow-fibre membrane, tubular membrane, sheet frame flat sheet membrane, rolling flat sheet membrane.
Heat exchanger tube, as adopted plastic hollow fiber, preferably adopts the plastic hollow fiber that heat conductivility is better, have gap structure.As the Kynoar plastic hollow fiber obtaining by wet spinning, having can be up to more than 80% voidage, and during use, filling liquid water in voidage, can significantly improve the heat conductivility of Kynoar plastic hollow fiber, improves heat exchange efficiency.
The decompression multiple-effect membrane distillation method that the present invention proposes, by the water vapour condensation in film still-process and the coupling of feed liquid heating process, under high water generation ratio condition, has higher flux of membrane distillation, meanwhile, and without additional cooling water.The multiple-effect film still-process designing by the present invention, can realize film still-process efficient, low energy consumption, and heat recovery rate is high.
Accompanying drawing explanation
Fig. 1 is the present invention's a kind of process flow diagram of multiple-effect distillation device that reduces pressure.
Fig. 2 is the present invention's another kind of process flow diagram of multiple-effect distillation device that reduces pressure.
Major label description in figure: 1 is former water water inlet pipe, and 2 is external heat exchanger, and 3 is circulating-heating tank, and 5 is water circulating pump, and 6 and 7 is booster water pump, 8 for producing water pump, and 9 is vavuum pump.11 for first order film distillation composition element, 12 is for second level film distillation composition element, 13 is third level film distillation composition element, and 14 is certain one-level film distillation composition element in the middle of flow process, and its material liquid outlet is provided with shunt valve 53,15 for final stage film distillation composition element.21 is the heat exchanger tube in first order film distillation composition element, 23 is the heat exchanger tube in third level film distillation composition element, 24 is the heat exchanger tube in certain one-level film distillation composition element in the middle of flow process, and its material liquid outlet is provided with shunt valve 53,25 for the heat exchanger tube in final stage film distillation composition element.31 hydrophobic membrane, 32 hydrophobic membrane, 33 of distilling in composition element for second level film of distilling in composition element for first order film are the hydrophobic membrane in third level film distillation composition element, 34 is the hydrophobic membrane in certain one-level film distillation composition element in the middle of flow process, and 35 is the hydrophobic membrane in final stage film distillation composition element.41 is the film distillation product water communicating pipe between the first order and second level film distillation composition element, 42 is the film distillation product water communicating pipe between the second level and third level film distillation composition element, 43 is the film distillation product water communicating pipe between the third level and fourth stage film distillation composition element, 44 is that water communicating pipe is produced in the film distillation between in certain two-stage film distillation composition element in the middle of flow process, and 45 distill product water communicating pipe for final stage film distillation composition element and the film producing between water pump.50 is gas-liquid separation container, and 51 produce water discharge pipe for the distillation of device film, and 52 for device concentrated water drainage goes out pipe, 53 bypasses, and the former water of A, B produces water, the dense water of C.
The specific embodiment
The multiple-effect membrane distillation method that the present invention proposes, according to actual needs, can arrange Using Multistage Membranes distillation composition element, but at least need two-stage.Multiple-effect distillation device process flow diagram according to the present invention describes below.Fig. 1, Fig. 2 are all multiple-effect distillation device process flow diagrams of the present invention, and the pipeline of the two connects slightly different.
As shown in Figure 1, from circulating-heating tank 3 feed liquid out, temperature is 60 to 95 ℃, through water circulating pump 5, send in the hydrophobic membrane stream in first order film distillation composition element 11, the hydrophobic membrane of flowing through from top to bottom stream 31, under the suction function of first order film distillation composition element 11 shell sides, the distillation of generation film, the steam evaporating sees through the fenestra of hydrophobic membrane, enter first order film distillation composition element shell side, then contact with heat exchanger tube 21 tube walls, feed liquid in heating heat exchanger tube, self is condensed steam, discharge the heat of transformation, become the distillation of first order film and produce water.Unevaporated feed liquid in hydrophobic membrane stream, be evaporated and lower the temperature after 5 to 20 ℃, in first order film distillation composition element 11, flow through heat exchanger tube 21 from bottom to top, because its temperature is lower than the steam temperature outside the heat exchanger tube of par height and position, thereby heat absorption intensification, then, flow out first order film distillation composition element 11.By film distillation composition element of the present invention, design, the feed temperature flowing out from first order film distillation composition element, only, slightly lower than the inlet temperature that enters first order film distillation composition element, temperature difference is 5 to 10 ℃.
The feed liquid flowing out from first order film distillation composition element 11 heat exchanger tubes 21, continue to enter in the hydrophobic membrane stream in second level film distillation composition element 12, equally, the hydrophobic membrane of flowing through from top to bottom stream, under the suction function of second level film distillation composition element 12 shell sides, the distillation of generation film, the steam evaporating sees through the fenestra of hydrophobic membrane, enter second level film distillation composition element shell side, then contact with heat exchanger tube tube wall, the feed liquid in heating heat exchanger tube, self is condensed steam, discharge the heat of transformation, become second level film distillation and produce water.Unevaporated feed liquid in hydrophobic membrane stream, be evaporated and lower the temperature after 5 to 20 ℃, in second level film distillation composition element 12, flow through heat exchanger tube from bottom to top, because its temperature is lower than the steam temperature outside the heat exchanger tube of par height and position, thereby heat absorption intensification, then, flow out second level film distillation composition element, enter third level film distillation composition element.The feed temperature flowing out from second level film distillation composition element, only, slightly lower than the inlet temperature that enters second level film distillation composition element, temperature difference is 5 to 10 ℃.
Carry out step by step thus, feed liquid is lowered the temperature step by step, and is concentrated.
Former water A produces after the waste heat of water through external heat exchanger 2 absorbing film distillations, directly supplements heat exchanger tube 25 entrances that enter final stage film distillation composition element 15.
Film distillation in first order film distillation composition element 11 is produced water by entering second level film distillation composition element 12 shell sides communicating pipe 41, film distillation in second level film distillation composition element 12 is produced water by entering third level film distillation composition element 13 shell sides communicating pipe 42, by that analogy, finally enter in final stage film distillation composition element 15, by water producing pipe 45, after external heat exchanger 2 and former water heat exchange, through gas-liquid separation container 50, by producing water pump 8, extract out again, by gas-liquid separation container 50, connect respectively water producing pipe 51, produce water pump 8 and vavuum pump 9.In every grade of film distillation composition element, the import liquid level of producing water communicating pipe all will be higher than the outlet liquid level of producing water communicating pipe, the water producing pipe setting of similar low-temperature multi-effect vaporising device.By producing import and export liquid level difference and the vavuum pump 9 of water communicating pipe in every grade of film distillation composition element, realize the vacuum step of film distillation composition element shell sides at different levels and control.
According to actual needs, Using Multistage Membranes distillation composition element can be set, but at least need two-stage, can by suitable progression, arrange for 2 to 50 grades, can take into account and obtain high water generation ratio and high flux of membrane distillation.
Because feed liquid pipeline transport path is longer, need to distill the one or more booster water pumps of the suitable position configuration of composition element inter-stage, booster water pump 6 and 7 as shown in FIG. at film.
In order to improve general arrangement effect, can be in certain suitable one-level film distillation composition element 14 material liquid outlet position, bypass 53 is set, make the feed liquid of part higher temperature directly return to circulating-heating tank 3, another part feed liquid still enters next stage film distillation composition element, and feed liquid is further concentrated.At final stage film distillation composition element 15, the feed liquid after film distillation, part, as dense water C, by dense water pipe 52 discharge systems, after another part feed liquid and the new former water hybrid cooling supplementing, enters heat exchanger tube 25.
As shown in Figure 2, just method of attachment and Fig. 1 of pipeline slightly distinguish.From circulating-heating tank 3 60 to 95 ℃ of feed liquids out, through water circulating pump 5, send in the hydrophobic membrane stream in first order film distillation composition element 11, the distillation of generation film, unevaporated feed liquid in hydrophobic membrane stream, be evaporated and lower the temperature after 5 to 20 ℃, directly enter in the hydrophobic membrane pipeline of second level film distillation composition element 12, proceed film distillation, unevaporated feed liquid in hydrophobic membrane stream, again be evaporated and lower the temperature after 5 to 20 ℃, get back in first order film distillation composition element, as cooling liquid, flow through heat exchanger tube from bottom to top, after heat absorption heats up, enter in third level film distillation composition element hydrophobic membrane stream, proceed film distillation.Like this, from first order film distillation composition element, in its heat exchanger tube, cooling liquid, from next stage film distillation composition element, is compared and is had lower temperature with Fig. 1 pipeline connecting method, thereby have better cooling effect; From third level film distillation composition element, the feed liquid in its hydrophobic membrane stream, is heated by the steam of front two-stage higher temperature, compares and has higher temperature, thereby have better evaporation with Fig. 1 pipeline connecting method.Be Fig. 2 pipeline connecting method compared to Figure 1, can make to evaporate between feed liquid and cooling feed liquid and there is larger temperature difference.
In final stage film distillation composition element, unevaporated feed liquid in hydrophobic membrane stream, is divided into three tunnels, and one goes out as concentrated water drainage, and it two enters heat exchanger tube at the corresponding levels as cooling liquid, and it three returns to the heat exchanger tube of upper level as cooling liquid.
Remainder in Fig. 2 is identical with Fig. 1.
In distillation device of the present invention, the hot water that running water, seawater, the cooling system of feed liquid through heating discharged or the chemical products solution that needs to concentrate or desalinate processing.
The content not describing in the embodiment of the present invention is prior art, therefore, no longer repeat.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a decompression multiple-effect distillation device, is characterized in that, comprises Using Multistage Membranes distillation composition element, water circulating pump, vavuum pump, circulating-heating tank, heat exchanger, product water pump, gas-liquid separation container and tube connector each other; The hydrophobic membrane of vertical stream from top to bottom and the heat exchanger tube of vertical stream are from bottom to top set in this film distillation composition element; Between each film distillation composition element, be provided with feed liquid tube connector and produce water communicating pipe.
2. decompression multiple-effect distillation device according to claim 1, is characterized in that, described water circulating pump is arranged on the feed liquid tube connector between circulating-heating tank delivery port and first order film distillation composition element water inlet; Between circulating-heating tank water inlet and final stage film distillation composition element heat exchanger tube delivery port, be provided with feed liquid tube connector;
This final stage film distillation composition element is connected water communicating pipe by film distillation product with external heat exchanger tube pass; External heat exchanger shell pass import is connected with raw water tubes, and shell side outlet is connected by tube connector and the import of final stage film distillation composition element heat exchanger tube; Final stage film distillation composition element is provided with concentrated water drainage outlet connection concentrated water drainage and goes out pipe;
Described gas-liquid separation container is connected with vavuum pump with external heat exchanger shell pass outlet by feed liquid tube connector respectively, and is provided with product mouth of a river junctional membrane distillation product water discharge pipe, and this film distillation is produced water discharge pipe and is provided with product water pump.
3. decompression multiple-effect distillation device according to claim 1, is characterized in that: described Using Multistage Membranes distillation composition element is 2 to 50.
4. decompression multiple-effect distillation device according to claim 1, is characterized in that: the liquid level of importing and exporting product water communicating pipe in described every one-level film distillation composition element shell side exists difference in height.
5. decompression multiple-effect distillation device according to claim 1, is characterized in that: describedly every three, to the feed liquid tube connector between Pyatyi film distillation composition element, a booster pump is set.
6. decompression multiple-effect distillation device according to claim 1, is characterized in that: the described the reciprocal the 2nd or 3 grades of films distillation composition element material liquid outlet positions a bypass is set.
7. a decompression multiple-effect membrane distillation technique method, is characterized in that: comprise when feed liquid flows through the hydrophobic membrane stream in film distillation composition element, under the suction function of shell side, film distillation occurs; The steam evaporating enters shell side, contacts with heat exchanger tube tube wall, discharges the heat of transformation and is condensed, and becomes film distillation and produces water; Unevaporated feed liquid in hydrophobic membrane stream, is evaporated after cooling, flows through heat exchanger tube, and heat absorption heats up, and then enters the hydrophobic membrane stream of next stage film distillation composition element; Carry out step by step thus, make feed liquid concentrated rear discharge step by step.
8. decompression multiple-effect membrane distillation method according to claim 7, is characterized in that: also comprise that former water produces after the waste heat of water through external heat exchanger absorbing film distillation, directly supplements the heat exchange tube inlet that enters final stage film distillation composition element.
9. decompression multiple-effect membrane distillation method according to claim 7, is characterized in that: water is produced in the film distillation in described film distillation composition elements at different levels, by being communicated with successively communicating pipe, finally by producing water pump, extracts out; In every grade of film distillation composition element, produce import and export liquid level difference and the vavuum pump of water communicating pipe, realize the vacuum degree control of film distillation composition element shell sides at different levels; In described every one-level film distillation composition element, unevaporated feed liquid in hydrophobic membrane stream, being evaporated cooling extent is 5 to 20 ℃.
10. decompression multiple-effect membrane distillation method according to claim 7, is characterized in that: described feed liquid is the former water through heating, and this former water is the hot water of running water, seawater, cooling system discharge or needs chemical products solution concentrated or that desalination is processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410479625.0A CN104190259A (en) | 2014-09-19 | 2014-09-19 | Multi-effect decompression membrane distillation method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410479625.0A CN104190259A (en) | 2014-09-19 | 2014-09-19 | Multi-effect decompression membrane distillation method and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104190259A true CN104190259A (en) | 2014-12-10 |
Family
ID=52075711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410479625.0A Pending CN104190259A (en) | 2014-09-19 | 2014-09-19 | Multi-effect decompression membrane distillation method and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104190259A (en) |
Cited By (5)
| 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 |
| CN108067100A (en) * | 2017-12-29 | 2018-05-25 | 北京中科瑞升资源环境技术有限公司 | Rolled film distillation equipment and use its membrane distillation system |
| CN110496538A (en) * | 2019-09-12 | 2019-11-26 | 兰州理工大学 | A kind of efficient membrane component for desulfurization wastewater processing |
| CN110500910A (en) * | 2019-08-26 | 2019-11-26 | 华北电力大学 | A kind of caloic decoupling heat exchanger and its caloic decoupling method |
| CN111111451A (en) * | 2020-01-17 | 2020-05-08 | 吕剑阳 | Reduced pressure multi-effect membrane distillation method and device thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101632902A (en) * | 2008-07-21 | 2010-01-27 | 天津海之凰科技有限公司 | Energy-saving vacuum membrane distillation component device and vacuum membrane distillation method |
| CN101632901A (en) * | 2008-07-21 | 2010-01-27 | 天津海之凰科技有限公司 | Heat-recovery vacuum membrane distillation component device and vacuum membrane distillation method |
| CN101773784A (en) * | 2009-01-08 | 2010-07-14 | 天津海之凰科技有限公司 | Vacuum membrane distillation device and method thereof |
| CN201760233U (en) * | 2010-08-27 | 2011-03-16 | 天津海之凰科技有限公司 | Multi-stage pressure-reducing membrane distillation component unit device and membrane distillation device employing same |
| CN102371120A (en) * | 2010-08-27 | 2012-03-14 | 天津海之凰科技有限公司 | Multistage vacuum membrane distillation (VMD) module unit device as well as MD device and method thereof |
| CN102861512A (en) * | 2011-07-07 | 2013-01-09 | 天津海之凰科技有限公司 | Coupling type membrane distillation assembly device and method |
| CN103387308A (en) * | 2013-08-13 | 2013-11-13 | 国家海洋局天津海水淡化与综合利用研究所 | Multi-effect membrane distillation-multistage flash evaporation seawater desalination system |
-
2014
- 2014-09-19 CN CN201410479625.0A patent/CN104190259A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101632902A (en) * | 2008-07-21 | 2010-01-27 | 天津海之凰科技有限公司 | Energy-saving vacuum membrane distillation component device and vacuum membrane distillation method |
| CN101632901A (en) * | 2008-07-21 | 2010-01-27 | 天津海之凰科技有限公司 | Heat-recovery vacuum membrane distillation component device and vacuum membrane distillation method |
| CN101773784A (en) * | 2009-01-08 | 2010-07-14 | 天津海之凰科技有限公司 | Vacuum membrane distillation device and method thereof |
| CN201760233U (en) * | 2010-08-27 | 2011-03-16 | 天津海之凰科技有限公司 | Multi-stage pressure-reducing membrane distillation component unit device and membrane distillation device employing same |
| CN102371120A (en) * | 2010-08-27 | 2012-03-14 | 天津海之凰科技有限公司 | Multistage vacuum membrane distillation (VMD) module unit device as well as MD device and method thereof |
| CN102861512A (en) * | 2011-07-07 | 2013-01-09 | 天津海之凰科技有限公司 | Coupling type membrane distillation assembly device and method |
| CN103387308A (en) * | 2013-08-13 | 2013-11-13 | 国家海洋局天津海水淡化与综合利用研究所 | Multi-effect membrane distillation-multistage flash evaporation seawater desalination system |
Cited By (6)
| 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 |
| CN108067100A (en) * | 2017-12-29 | 2018-05-25 | 北京中科瑞升资源环境技术有限公司 | Rolled film distillation equipment and use its membrane distillation system |
| CN110500910A (en) * | 2019-08-26 | 2019-11-26 | 华北电力大学 | A kind of caloic decoupling heat exchanger and its caloic decoupling method |
| CN110500910B (en) * | 2019-08-26 | 2023-09-15 | 华北电力大学 | Thermal mass decoupling method of thermal mass decoupling heat exchanger |
| CN110496538A (en) * | 2019-09-12 | 2019-11-26 | 兰州理工大学 | A kind of efficient membrane component for desulfurization wastewater processing |
| CN111111451A (en) * | 2020-01-17 | 2020-05-08 | 吕剑阳 | Reduced pressure multi-effect membrane distillation method and device thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103387308B (en) | Multi-effect membrane distillation-multistage flash evaporation seawater desalination system | |
| CN104190258B (en) | Liquid gap multiple-effect membrane distillation technique and device thereof | |
| CN100584765C (en) | Natural vacuum low temperature distillation sea water desalination method and device | |
| CN103449548B (en) | Marine heat pipe type seawater desalination device | |
| CN102642883B (en) | System for desalinating seawater by waste heat from power plant | |
| CN102381796B (en) | Solar photovoltaic photothermal integrated device for seawater desalination | |
| CN104190260B (en) | Decompression combination air gap membrane distillation method and device thereof | |
| CN101920169B (en) | Membrane evaporating and concentrating method and device | |
| CN104190259A (en) | Multi-effect decompression membrane distillation method and device thereof | |
| CN201201907Y (en) | Natural vacuum low temperature distillation sea water desalting apparatus | |
| CN201587871U (en) | Multi-stage vacuum distillation sea water desalinating device | |
| CN102225787A (en) | Composite solar seawater desalination device and method | |
| CN102329035B (en) | Fresh water collecting and supplying system | |
| CN107434327A (en) | The hotting mask coupling seawater desalination system of Water Sproading more than a kind of waste heat overbottom pressure | |
| CN201834781U (en) | Single-stage vacuum distillation seawater desalination device | |
| CN205035108U (en) | A light water condenser for sea water desalination device | |
| CN104803532A (en) | Seawater desalting device adopting membrane type humidification and dehumidification and seawater desalting method | |
| CN202080914U (en) | Composite solar seawater desalting device | |
| CN103316588A (en) | Multiple-effect membrane distillation device and method | |
| CN201660457U (en) | Novel multiple-effect distilled sea water desalination device | |
| CN111111451B (en) | Reduced pressure multi-effect membrane distillation method and device thereof | |
| CN102107119A (en) | Multiple-effect membrane distillation device and method | |
| CN102949936A (en) | Efficient coupling membrane distillation assembly device and method thereof | |
| CN104724776A (en) | Device and method for mixing secondary steam into pressurized water in pressurized evaporation | |
| CN101874983B (en) | Method and device for evaporation concentration of depressurized membrane |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141210 |