CN101852559B - System for recovering both heat and pure water and application method thereof - Google Patents
System for recovering both heat and pure water and application method thereof Download PDFInfo
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- CN101852559B CN101852559B CN2010101823756A CN201010182375A CN101852559B CN 101852559 B CN101852559 B CN 101852559B CN 2010101823756 A CN2010101823756 A CN 2010101823756A CN 201010182375 A CN201010182375 A CN 201010182375A CN 101852559 B CN101852559 B CN 101852559B
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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
- 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
- Y02W10/33—Wastewater or sewage treatment systems using renewable energies using wind energy
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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
- 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 discloses a system for recovering both heat and pure water and an application method thereof. The system comprises a hot solution storage tank, a low temperature solution collection tank, a plurality of membrane components, a heat and pure water collection and storage tank and a circulating cooling water storage tank. The method comprises the following steps of: (1) allowing hot solution to enter the hot solution storage tank and storing the hot solution; (2) delivering the hot solution stored in the hot solution storage tank into the low temperature solution collection tank to be collected through tube passes of the membrane components; (3) feeding the cold water in the circulating cooling water storage tank into the heat and pure water collection and storage tank through shell passes of the membrane components; and (4) performing the steps (2) and (3) simultaneously to recover both the heat and the pure water. In the invention, the latent heat transfer of the vapor with the vapor mass transfer function between membranes is used as a beneficial enhanced mode for heat exchange between cold fluid and hot fluid. Meanwhile, the recovery of the pure water is realized, and the heat exchange efficiency of the system is high due to the latent heat transfer function of the vapor; and because the membrane material belongs to organic high molecular materials and can provide a huge contact area so as to ensure small volume and weight of the device and better energy conservation of the system.
Description
Technical field
The invention belongs to energy-saving and emission-reduction, energy source use and film distillation technology application, relate to the heat and mass transfer process in heat and water yield recovery method and the film distillation technology, the method and apparatus of particularly a kind of heat and the dual recovery of pure water.
Background technology
Energy-saving and emission-reduction and sustainable development are one of major issues that faces in Chinese national economy and the social development.In its implementation process; Energy restructuring is actively pushed forward in an important behave exactly; Greatly develop regenerative resource, advance scientific research, exploitation and the construction of wind energy, solar energy, geothermal energy, water power, biogas, biomass utilization and regenerative resource and architecture-integral.Scientific and technical innovation is carried forward vigorously in another important behave exactly, strengthens energy conservation, improves efficiency of energy utilization, reduces energy waste and environmental pollution.China is the fastest country of new and renewable sources of energy growth rate, especially ranks first in the world aspect utilizing at solar water.Simultaneously, China is again the lower country of efficiency of energy utilization, and the overall efficiency of energy utilization of China is about 33%, and lower by 10% than developed country, the per GDP energy consumption is more than 2 times of world average level, so energy-saving potential is huge.
In the commercial production, exist a large amount of waste heats, spent hot water's solution, these residual heat resources and water resource could realize discharged at lower temperature or make other purposes after need passing through further heat recovery and water yield recovery.For the recycling of waste heat, traditional measure is to carry out exchange heat through metallic recuperator to obtain; And for useless water reuse,, adopt different processes to handle according to the difference of water quality and the difference of water system, such as employing leave standstill, methods such as chemicals, filtration.All be to carry out through independent technology or flow process to the recovery of heat with to the recovery of water resource in the traditional handicraft, device volume and weight are bigger, and system is more complicated also.Therefore, in traditional handicraft often on the problem that reclaims the heat and the water yield selection one of which perhaps will reclaim heat and the recycle-water resource is carried out the recovery that technological design realizes heat and water resource respectively as serial flow as emphasis.
Because spent hot water, remaining hot water in the industry belong to low-grade heat source; Need adopt the metallic recuperator of the little temperature difference for the recovery of its heat, therefore, the heat exchange area of heat exchanger is generally bigger; Heat exchange area means that greatly heat exchanger volume and weight are big, mean that also the initial cost of heat exchanger is big.Simultaneously, the heat exchanger of the little temperature difference makes that the organic efficiency of heat also can not be very high.Secondly, owing to adopt separate technology, make that the equipment of system is numerous, the tediously long complicacy of technological process for the recovery of heat and the recovery of water resource.
In recent years, along with the development of high-molecular organic material and film preparation technology, film distillation technology just more and more receives people's attention as an emerging solution-treated mode.The basic principle of film distillation technology is to make steam diffuse to low temperature side from high temperature side through the impetus of the steam pressure difference of film both sides solution (steam pressure of film both sides is pressure decisions of nonfluid self by the pairing vapour pressure decision of the temperature of its fluid).According to the difference of the steam condensing mode that is diffused into the film cold side, can be divided into direct contact membranes distillation (DCMD), air gap film distillation (AGMD), gas and sweep the distillation of formula film (SGMD) and pressure reducing film distillation (VMD).In these four kinds of film distillation modes, in the direct contact type film distillation in the type of flow of cold and hot fluid and the traditional recuperative heat exchanger type of flow of cold and hot fluid quite similar.Different is, in the recuperative heat exchanger, the heat between the cold and hot fluid transmits with the form of heat conduction through partition, and cold and hot fluid itself is not mixed mutually or contact; And in the distillation of direct contact type film; Heat transmission between the cold and hot fluid is except passing through the heat conduction of membranous wall face; Also the diffusion through steam is transmitted the latent heat of steam from hot side direction cold side, and the transfer mode of this latent heat has improved the exchange heat between the cold and hot fluid greatly.In traditional direct contact type film still-process; Because the target of technology is the volatile solute of obtaining in the solution; Therefore the membrane mass transfer of striding of steam is its unique realization target; Based on this target, must the thermal conductivity factor of membrane material be limited to some extent, the membrane material that promptly must adopt low thermal conductivity is to guarantee necessary membrane flux.Simultaneously, in a lot of technologies, also must cool off to realize the recovery of pure matter (steam) for the latent heat transmission that the mass transfer of steam is entrained.
Patent " the hyperfiltration sea water desalinating unit of band the heat recovery " (patent No.: 200620100026.4) proposed a kind of hyperfiltration sea water desalinating unit with heat recovery; The type of its application is a reverse osmosis unit; Reverse osmosis unit and distillation device have the difference of essence; The motive force of its infiltration water is the pressure differential of the solution of reverse osmosis membrane both sides; And the mass transfer force of steam is the temperature difference of film both sides water in the film distillation, and the two has the difference of essence this point, adopts traditional dividing wall type heat exchanger to carry out for the recovery of heat in this patent.200820075402.8) and patent " a kind of heat reclamation type pressure reducing film distillation assembly apparatus and the method " (patent No.: 200810053905.X) announced a kind of heat reclamation type pressure reducing film distillation assembly apparatus and method patent " a kind of heat reclamation type pressure reducing film distillation assembly apparatus " (patent No.:; Steam reclaims condensation heat at the condensing mode of inlet side in this patent employing pressure reducing film distillation method, and latent heat heat recovery mode is to adopt the mode of heat exchanger tube to carry out.And what adopted among the present invention is that the mode of direct contact type film distillation reclaims intermembranous heat conduction amount and latent heat amount, reclaims pure water simultaneously.Patent " a kind of energy-saving pressure-reduction distillation device and the method " (patent No.: 200910170615.8) announced a kind of pressure reducing film distillation (VMD) device and method that can effectively carry out heat recovery.Similar with above-mentioned patent 200810053905.X, this patent adopts the latent heat of the method recycle-water steam of gas-liquid heat-exchange to the pressure reducing film distillation process.Patent " heat recuperating membrane distillation apparatus and the system " (patent No.: 200910170615.8) announced a kind of contactor assembly that is used for separating distillate from feedstock solution; This patent is the latent heat recovery in the film transmittance process of striding to steam for the recovery of heat; The form of cooling heat exchanger is adopted in the recovery of heat, and this patent is consistent with choosing of conventional film distillation for choosing of membrane material.
The present application at home and abroad of direct contact type film distillation is mainly in fields such as solution concentration, solute purification, wastewater treatments.Application aims is that the volatile component in the hot side solution is separated through the diffusion of fenestra or reclaims.That is to say that striding membrane mass transfer is the main goal in research of direct contact type film distillation, and strides the heat loss that the film heat transfer is regarded as the film still-process.And in the present invention the film of striding that is regarded as heat loss in the film distillation is conducted heat as the useful heat conduction pattern in the heat recovery, and with in the film still-process because the entrained latent heat transfer mode of steam effect of mass transmitting is converted into the latent heat transfer mode of heat recovery.Simultaneously, because the effect of mass transmitting of steam realizes the recovery of pure water at the film cold side.Therefore, the present invention is intended to utilize the heat transfer of film still-process and mass transport process to realize the heat of used heat and waste heat solution and the dual recovery of the water yield.
As stated; Direct contact type film still-process is applied to the dual removal process of heat and water resource; Because the entrained latent heat transfer function of mass transfer of the steam in the film still-process; With the exchange heat that improves cold fluid and hot fluid greatly, improve the Btu utilization efficient in spent hot water, the remaining hot water; Simultaneously, be distilled water after the condensation side condensation owing to pass through the steam of membranous wall face, so water quality is very pure.In addition, in the film distillation, membrane module can be realized the flexible configuration of water treatment scale very easily through the mode of serial or parallel connection, and therefore, the equipment of system is simple, flexible operation.This shows, design a kind of dual retracting device of caloic and have very important practical applications meaning for the target for energy-saving and emission-reduction of realizing the recovery of heat recovery and water resource based on direct contact type film still-process.
Summary of the invention
The objective of the invention is to film distillation technology is incorporated in the system of heat and the dual recovery of pure water, the latent heat transmission in the film distillation is incorporated into (latent heat recovery) in the heat recovering process, the latent heat transmission will improve the exchange heat of cold fluid and hot fluid greatly; The intermembranous conduction process that is regarded as " thermal loss " in the film distillation technology also is incorporated into (sensible heat recovery) in the basic heat recovering process.Simultaneously, because the transfer function of intermembranous steam makes steam from the transmission of hot side direction cold side, realized the recovery of pure water.According to the energy-saving and emission-reduction demand that in the basic principle of film distillation technology and the industry heat recovery and water resource is reclaimed, the method and apparatus of a kind of heat and the dual recovery of pure water has been proposed.It is high that this method and apparatus has exchange heat efficient, and system is simple, the equipment flexible configuration, and utilization efficiency of heat energy is high, can realize the dual recovery of heat and water resource.
For achieving the above object; The present invention intends and solving through following technical scheme: a kind of system that is used for heat and the dual recovery of pure water, and this system comprises hot solution storage tank, cryogenic fluid collector, several membrane modules, heat and pure water collection storage tank and recirculated cooling water storage tank; Said several membrane module one ends are provided with hot solution storage tank and heat and pure water collection storage tank, and the other end is provided with cryogenic fluid collector and recirculated cooling water storage tank; Said membrane module adopts the version of hollow-fibre membrane, forms the liquid form of tube side and two kinds of solution of shell side, and the tube side two ends are respectively arranged with tube side import and tube side outlet, and the shell side two ends are respectively arranged with shell side import and shell side outlet; Said several membrane modules connect with the mode of series, parallel or series-parallel connection, and wherein tube side is communicated with hot solution storage tank and cryogenic fluid collector, and shell side is communicated with heat and pure water collection storage tank and recirculated cooling water storage tank.
Said hot solution storage tank is provided with hot solution along separate routes; Said hot solution makes the tube side import of each membrane module all be communicated with the hot solution storage tank along separate routes.
Said recirculated cooling water storage tank is provided with cooling water along separate routes; Said cooling water makes the shell side import of each membrane module all be communicated with the recirculated cooling water storage tank along separate routes.
Said a kind of application process that is used for the system of heat and the dual recovery of pure water, according to following steps: (1) makes hot solution get into hot solution storage tank and storage; The hot solution of (2) storing in the hot solution storage tank is compiled through the tube side import entering cryogenic fluid collector of membrane module; (3) cold water in the recirculated cooling water storage tank gets into the heat and pure water collection storage tank through the shell side import of membrane module; (4) carry out step (2) and step (3) simultaneously, accomplish heat and the dual recovery of pure water.
Described membrane material can adopt the membrane material of different thermal conductivity factors.If the requirement of system recoveries heat is greater than the requirement of reclaiming pure water, membrane material adopts the high membrane material of thermal conductivity factor; If the requirement of system recoveries pure water is greater than the requirement of reclaiming heat, membrane material adopts the low membrane material of thermal conductivity factor.
The used membrane material of described film distillation assembly is selective permeation membrane material or the surperficial membrane materials through the hydrophobicity enhancement process of film such as polythene material (PE) membrane material, polypropylene material (PP) membrane material, polytetrafluoroethylene (PTFE) membrane material, Kynoar (PVDF) membrane material.
The present invention is incorporated into the caloic transmittance process in the film distillation in the dual removal process of heat and pure water; Utilize in the film distillation technology the intermembranous heat conduction that is regarded as " thermal loss " as the citation form that heat transmits, utilize the useful enhancement mode of the transmission of the entrained steam latent heat of intermembranous steam effect of mass transmitting as the cold fluid and hot fluid exchange heat.Simultaneously, because the effect of mass transmitting of steam has realized the recovery of pure water.Because membrane material belongs to the organic polymer polymeric material, membrane module can provide huge contact area, therefore can reduce the volume and weight of system greatly; Also because membrane module can be simply, combination fast, can differently connect and parallelly connected mode is expanded to what the heat recovery and the water yield reclaimed demand along with system to system; Can be applicable in industry or the life for the recovery of the heat and the water yield.Because the latent heat transfer function of steam, the exchange heat efficient of system is higher.The volume and weight of device is littler simultaneously, and system is more energy-conservation.
Description of drawings
Fig. 1 is a structure principle chart of the present invention; Fig. 2 is a membrane module structure sketch map among the present invention; Fig. 3 is the membrane material microcosmic heat and mass sketch map of heat and the dual recovery of pure water among the present invention.
Wherein: 1 be the hot solution storage tank, 2 for the cryogenic fluid collector, 3 for the recirculated cooling water storage tank, 4 for the heat and pure water collection storage tank, 5 for membrane module, 6 for film, 7 for the tube side import, 8 for tube side outlet, 9 for shell side import, 10 be that shell side exports.
The specific embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are done further explain.
At first,, quote the appellation of the shell-and-tube exchanger in the thermal technology field, flow process in the pipe in the membrane module is called tube side, the outer flow process of membrane module pipe is called shell side in order to narrate conveniently.
With reference to Fig. 1, at first be that film distillation technology is in traditional application for the choosing of membrane material; The membrane flux of steam is the key factor of evaluated for film material; For membrane material to choose with low thermal conductivity be main foundation because only in this way could make through " conductive heat loss " of membranous wall face for a short time, the film temperature difference is big; The driving force of steam is big, makes membrane flux increase.Film distillation technology is applied in the system of heat recovery and water yield recovery; Because it is all useful for heat recovery to stride the sensible heat transfer (intermembranous heat conduction) and the latent heat transmission (latent heat that the steam mass transfer carries) of film; Therefore; The scope that the thermal conductivity factor of membrane material is selected is more wide in range, can select flexibly the requirement of heat recovery and water yield recovery according to system for use in carrying.Therefore, from application point of view, the research range to membrane material has also been widened in the dual recovery that film distillation technology is applied to the heat and the water yield.
Secondly, adopt the heat and the water yield recovery system of film distillation technology that the two-way fluid flow is arranged, the one tunnel is the hot solution flow process, and one the tunnel is the cold fluid flow process.The cold fluid flow process provides heat recovery the required temperature difference for system on the one hand, becomes the carrier that heat recovery and pure water reclaim on the other hand.The flow path of hot fluid is followed successively by, used heat, remaining hot water solution, and hot solution storage tank 1, membrane module tube side (according to design requirement, membrane module can series, parallel or the connection in series-parallel combination) finally collects in cryogenic fluid collector 2.The flow path of cold fluid is followed successively by, recirculated cooling water storage tank 3, and the membrane module shell side, the heat and the pure water that reclaim the most at last collect in heat and the pure water storage tank 4.Wherein, In order to increase the temperature difference of the cold fluid and hot fluid in the membrane module; Improve exchange heat and pure water membrane flux; In the hot solution flow process, increased hot fluid along separate routes directly the flow direction respectively organize membrane module the tube side inlet in case with on the fluid of group membrane module outlet mix, simultaneously, in the cold fluid flow process, increased cold fluid along separate routes directly the flow direction respectively organize membrane module the shell side inlet in case with on the fluid of group membrane module shell side outlet mix.The temperature difference of hot fluid shunt and cold fluid introducing along separate routes can increasing cold fluid and hot fluid, purpose is for exchange heat that improves membrane module and pure water flux.In order to make that the temperature difference is even in the membrane module, tube side fluid and shell-side fluid in the system are counter-flow arrangement.
The description that is the present invention for heat and dual recovery method of pure water and device shown in Figure 1.Get in the hot solution storage tank from the spent hot water in industry or the life, remaining hot water solution; Get into the tube side import of the 1st group of membrane module successively, the hot fluid in membrane module in the tube side is after the cold fluid of shell side carries out the mass transfer of heat transmission and steam, and the solution temperature in the tube side reduces; Flow reduces; Get in tube side of next group membrane module and proceed heat transmission and steam mass transfer, so go down, after getting into n and organizing the membrane module tube side and carry out the mass transfer of heat transmission and steam; Flow at last in the cryogenic fluid collector 2; This moment, the temperature and the flow of solution reduced, and had not had the value of further heat recovery in theory, and cryogenic fluid is finally discharged and got into next procedure links.As previously mentioned, in order to strengthen the temperature of fluid in the tube side, from hot solution storage tank 1, drawn a shunt flow process, the tube side import solution with each group membrane module mixes respectively, with temperature that improves tube side solution and the tube side flow that replenishes because of effect of mass transmitting was reduced.
In order to reclaim heat and pure water, in the system of cold flow journey, must prepare a certain amount of recirculated cooling water, be used for membrane module carries out heat and pure water at shell side recovery.The flow process of shell-side fluid is such in the membrane module; Cooling water in the recirculated cooling water storage tank 3 gets into the shell side of n group membrane module successively, and this moment, cooling water temperature was minimum, in shell side, accepted the mass transfer of heat and steam of tube side solution after; Get into the mass transfer of proceeding exchange heat and steam in the shell side of last group of membrane module; So go down, after getting into the 1st group of membrane module shell side and carrying out exchange heat and steam mass transfer, flow at last in heat and the water yield collecting box 4.As previously mentioned, in order to reduce the temperature of fluid in the shell side, from the recirculated cooling water storage tank, drawn a flow process along separate routes, the shell side import solution with each group membrane module mixes respectively, improves the temperature difference of cold fluid and hot fluid with the temperature that reduces shell side solution.
Membrane material used in the membrane module is selective permeation membrane material or the surperficial membrane materials through the hydrophobicity enhancement process of film such as polyethylene (PE) membrane material, polypropylene (PP) membrane material, polytetrafluoroethylene (PTFE) membrane material or Kynoar (PVDF) membrane material.
Reclaim scale and production capacity for different heats and pure water, can make up extension realization through series connection and the parallel way that film distills assembly, and can adjust through the shunt of hot solution shunt and recirculated cooling water.
Principle of the present invention is: get in the hot solution storage tank 1 from the spent hot water in industry or the life, remaining hot water solution; Get into the tube side import of the 1st group of membrane module successively, the hot fluid in membrane module in the tube side is after the cold fluid of shell side carries out the mass transfer of heat transmission and steam, and the solution temperature in the tube side reduces; Flow reduces; Fluid in the tube side gets in tube side of next group membrane module and proceeds heat transmission and steam mass transfer, so goes down, get into n organize carry out heat transmission and steam mass transfer in the membrane module tube side after; Flow at last in the cryogenic fluid collector 2; This moment, the temperature and the flow of solution reduced, and had not had the value of further heat recovery in theory, and cryogenic fluid is finally discharged and got into next procedure links.As previously mentioned, in order to strengthen the temperature of fluid in the tube side, from the hot solution storage tank, drawn a shunt flow process, the tube side import solution with each group membrane module mixes respectively, with temperature that improves tube side solution and the tube side flow that replenishes because of effect of mass transmitting was reduced.
In order to reclaim heat and pure water, in the cold fluid flow process, prepare a certain amount of recirculated cooling water, be used for membrane module carries out heat and pure water at shell side recovery.Cooling water in the recirculated cooling water storage tank 3 gets into the shell side of n group membrane module successively; This moment, cooling water temperature was minimum; After in shell side, having accepted the mass transfer of heat and steam of tube side solution, get into the mass transfer of proceeding exchange heat and steam in the shell side of last group of membrane module, so go down; After getting into the 1st group of membrane module shell side and carrying out exchange heat and steam mass transfer; Flow at last in heat and the water yield collecting box 4, this moment, the temperature of shell-side fluid raise, and had not had the possibility of the exchange heat proceeded in theory.As previously mentioned, in order to reduce the temperature of fluid in the shell side, from the recirculated cooling water storage tank, drawn a flow process along separate routes, the shell side import solution with each group membrane module mixes respectively, improves the temperature difference of cold fluid and hot fluid with the temperature that reduces shell side solution.
Heat transmission in the membrane material of the present invention and steam mass transport process can be explained with the micro-structure diagram of Fig. 3.Fig. 3 is the sectional drawing of membrane material; The left side of membrane material is a hot solution in the diagram, and the right side is a cold soln, and membrane material is made up of the hydrophobic micropore material; Wherein the aperture of micropore is very little; Suitable with the mean free path of steam, the such structure and the hydrophobicity of membrane material have guaranteed to have only steam could pass through fenestra, and liquid solution can not be passed through.Steam is the saturation vapour pressure of the pairing steam of the temperature difference of film both sides solution through the motive force of membrane material, rather than the pressure differential of the film both sides aqueous solution, and the method for this point and counter-infiltration solution separating has the difference of essence.As shown in Figure 3, intermembranous diabatic process is made up of two parts, and a part is through the heat conduction amount between membranous wall, and another part is that this two parts heat has constituted the way of recycling of heat jointly owing to the entrained latent heat transmission of steam effect of mass transmitting.Intermembranous effect of mass transmitting is embodied in because the effect of the saturated vapour pressure of film both sides steam, and steam transmits from hot side direction cold side, and finally under the cold side condensation, has realized the recovery of the water yield.
What deserves to be mentioned is that in the application of conventional film distillation, the heat conduction between membranous wall is regarded as " thermal loss " always and becomes the unfavorable factor that influences membrane flux, make the membrane material of low thermal conductivity become the inevitable choice that the film distillation is used thus.The present invention is used for intermembranous heat conduction this " thermal loss " in the conventional film distillation the basic heat transfer mode of heat recovery; And utilize the schedule of reinforcement of the entrained latent heat transmission of steam mass transfer in the film distillation as heat recovery; Simultaneously; Utilize the way of recycling of the effect of mass transmitting of steam, reach the dual recovery of the heat and the water yield as pure water.Thus, can reclaim the flexible selection that requires the to carry out membrane material selection of high thermal conductivity coefficient membrane material (especially to) according to concrete heat or the water yield.
In order to verify the effect of native system to heat and the dual recovery of pure water; Hollow fiber film assembly to as shown in Figure 2 is tested, and membrane material has been selected Kynoar (PVDF) film for use, and membrane module is the hollow fiber film assembly form; Wherein the thermal conductivity factor of membrane material is lower, has only 0.14W/ (mK).Experiment parameter is: the inlet temperature of the tube side aqueous solution is 64～78 ℃, and the temperature of shell side water is 37 ℃; Tube side is identical with the flow of shell side solution, and its scope is 40-140L/h; The structural parameters of pvdf membrane material and membrane module are shown in table 1, table 2.
Table 1PVDF film tube material parameter
Table 2 hollow fiber film assembly parameter
Resultof the test shows, though the thermal conductivity factor of membrane material has only 0.14W/ (mK), compares very for a short time with the thermal conductivity factor of metal material 40W/ (mK), and effective contact area of solution is very big in the membrane module, can remedy because the little shortcoming of thermal conductivity factor.In test, the mass transfer amount of the total heat transfer of membrane module, sensible heat, latent heat and steam all increases and increases along with pipe side-entrance temperature, and basic retention wire sexual intercourse.In the temperature range of experiment, be about 2 times of sensible heat heat transfer amount through the latent heat heat output of membranous wall face, total heat transfer and mass transfer amount increase along with the increase of flow in the membrane module, the also increase of transmission while of latent heat and sensible heat.Simultaneously, through comparing with the metallic recuperator of the similar structures of identical heat exchange area, the volume of membrane module has only 1/7th of metal heat exchanger, and equipment is simple, and volume is little, and is in light weight.
| Average pore size/μ m | Porosity | Internal diameter/mm | Wall thickness/mm | External diameter/mm | Thermal conductivity factor/Wm 1K1 |
| 0.16 | 85% | 0.8 | 0.15 | 1.1 | 0.14 |
| External diameter/mm | Internal diameter/mm | Effective length/mm | Film pipe/root | Membrane area/m2 |
| 50 | 42 | 400 | 600 | 0.6 |
More than the thermal conductivity factor of used membrane material is very low in the test, and intermembranous steam mass transfer flux is bigger, and this mode can be applied to the water yield is reclaimed demanding occasion.If adopt the high membrane material of thermal conductivity factor, intermembranous heat conduction meeting is strengthened greatly, and membrane flux can descend to some extent, and this mode is fit to be applied to the occasion of having relatively high expectations for heat recovery.Certainly, must be for the design and the optimization of membrane module according to applied background and industrial requirements.
[0034] therefore, the method and apparatus of the dual recovery of the heat that is carried out among the present invention and the water yield is fully feasible.Above content is to combine concrete preferred implementation to further explain that the present invention did; Can not assert that the specific embodiment of the present invention only limits to this; Those of ordinary skill for technical field under the present invention; Under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to the present invention and confirm scope of patent protection by claims of being submitted to.
Claims (5)
1. system that is used for heat and the dual recovery of pure water, it is characterized in that: this system comprises hot solution storage tank, cryogenic fluid collector, several membrane modules, heat and pure water collection storage tank and recirculated cooling water storage tank; Said several membrane module one ends are provided with hot solution storage tank and heat and pure water collection storage tank, and the other end is provided with cryogenic fluid collector and recirculated cooling water storage tank; Said membrane module adopts the version of hollow-fibre membrane, forms the liquid form of tube side and two kinds of solution of shell side, and the tube side two ends are respectively arranged with tube side import and tube side outlet, and the shell side two ends are respectively arranged with shell side import and shell side outlet; Said several membrane modules connect with the mode of series, parallel or series-parallel connection, and wherein tube side is communicated with hot solution storage tank and cryogenic fluid collector, and shell side is communicated with heat and pure water collection storage tank and recirculated cooling water storage tank; Said membrane module can be according to reclaiming the different membrane materials that adopt different thermal conductivity factors that require to heat and pure water, if the i.e. requirement of system recoveries heat greater than the requirement of reclaiming pure water, membrane material adopts the high membrane material of thermal conductivity factor; If the requirement of system recoveries pure water is greater than the requirement of reclaiming heat, membrane material adopts the low membrane material of thermal conductivity factor.
2. a kind of according to claim 1 system that is used for heat and the dual recovery of pure water is characterized in that: said hot solution storage tank is provided with hot solution along separate routes; Said hot solution makes the tube side import of each membrane module all be communicated with the hot solution storage tank along separate routes.
3. a kind of according to claim 1 system that is used for heat and the dual recovery of pure water is characterized in that: said recirculated cooling water storage tank is provided with cooling water along separate routes; Said cooling water makes the shell side import of each membrane module all be communicated with the recirculated cooling water storage tank along separate routes.
4. like claim 1,2 or 3 said a kind of application processes that are used for the system of heat and the dual recovery of pure water, it is characterized in that, according to following steps:
(1) make hot solution get into hot solution storage tank and storage;
The hot solution of (2) storing in the hot solution storage tank is compiled through the tube side import entering cryogenic fluid collector of membrane module;
(3) cold water in the recirculated cooling water storage tank gets into the heat and pure water collection storage tank through the shell side import of membrane module;
(4) carry out step (2) and step (3) simultaneously, accomplish heat and the dual recovery of pure water.
5. a kind of according to claim 1 system that is used for heat and the dual recovery of pure water is characterized in that:
Described membrane material is polythene material membrane material, polypropylene material membrane material, polytetrafluoroethylene (PTFE) membrane material or PVDF membrane material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101823756A CN101852559B (en) | 2010-05-27 | 2010-05-27 | System for recovering both heat and pure water and application method thereof |
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| CN2010101823756A CN101852559B (en) | 2010-05-27 | 2010-05-27 | System for recovering both heat and pure water and application method thereof |
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| CN101852559B true CN101852559B (en) | 2012-03-28 |
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| SG11202003500UA (en) * | 2017-10-25 | 2020-05-28 | Memsift Innovations Pte Ltd | Membrane water treatment system and method thereof |
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| US7608188B2 (en) * | 2004-12-03 | 2009-10-27 | Board Of Regents Of The Nevada System Of Higher Education | Vacuum enhanced direct contact membrane distillation |
| US8083942B2 (en) * | 2004-12-06 | 2011-12-27 | Board of Regents of the Nevada System of Higher Education, on Behalf of the Universary of Nevada, Reno | Systems and methods for purification of liquids |
| US7608185B2 (en) * | 2007-12-18 | 2009-10-27 | Hamilton Sundstrand Corporation | Hollow fiber membrane modules for use in distillation systems |
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