CN103272395B - MVR (mechanical vapor recompression) vaporization system - Google Patents
MVR (mechanical vapor recompression) vaporization system Download PDFInfo
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Abstract
The invention relates to a vaporization system and provides an MVR vaporization system. An evaporator adopts a horizontal tube evaporator for which a closed inner chamber is formed by surrounding of a casing, wherein the inner chamber is divided into an evaporation chamber, a distribution cavity and a recovery cavity by two tube plates; a condensation tube bundle is horizontally arranged in the evaporation chamber and communicates the distribution cavity and the recovery cavity; a film distribution device is located above the condensation tube bundle, a concentrated solution outlet is formed in the bottom of an evaporation chamber, and condensed water outlets are formed in the bottoms of the distribution cavity and the recovery cavity; and a steam inlet pipe for communicating the outside and the distribution cavity and a steam outlet pipe for communicating the outside and the evaporation chamber are arranged, and a demister is arranged in the steam outlet pipe. on the basis that the conventional advantages are inherited, the MVR vaporization system reduces the construction cost, can achieve miniaturization, and is suitable for sewage treatment and raw material recovery in the fields of food and beverage, medicine and the like.
Description
Technical field
The present invention relates to vapo(u)rization system, especially a kind of MVR vapo(u)rization system.
Background technology
In industrial production, there is a large amount of evaporation operation, especially in fields such as chemical industry, pharmacy, papermaking, sewage disposal, desalinizations.In current large-scale industrial production, evaporation operation adopts tube-type down-flow evaporator to form multi-effect evaporation system conventionally, take high-temperature steam as thermal source, carries out the explosive evaporation of indirect thermal source heating.Tube-type down-flow evaporator, is divided into vertical pipe type falling film evaporator and transverse tube type falling film evaporator according to its structure.Multi-effect evaporation system, is that a plurality of evaporator series are used, and each evaporimeter is called an effect, and life steam is passed into the first single-effect evaporator, makes the solution boiling generation indirect steam that is heated; Using the indirect steam of the first single-effect evaporator as heating steam, introduce the second single-effect evaporator; In like manner, the indirect steam that the second single-effect evaporator produces can be used as again the heating steam of third effect evaporator, by that analogy.Multi-effect evaporation system, has reused heat energy, and can show lands reduces the consumption of raw steam, greatly reduces costs.
But multi-effect evaporation system, duration of work need to continue the raw steam of supply to the first single-effect evaporator, and raw steam consumption is still larger.Therefore, in order further to reduce the consumption of raw steam, later 1990s has been developed MVR vapo(u)rization system, and MVR is the english abbreviation of mechanical steam recompression technology, and English full name is Mechanical Vapor Recompression.Compare with traditional vapo(u)rization system, MVR vapo(u)rization system utilizes vapour compression machine to compress indirect steam, the raising of indirect steam temperature, pressure raising, the heat content of low-temperature level are increased, then as heating steam, send into evaporimeter and replace raw steam, realize recycling of steam.Therefore, MVR vapo(u)rization system is without giving birth to steam except starting, few to raw steam consumption, steam supply, water supply capacity are required extremely low, public work is supporting few, and corresponding floor space is little, total investment of engineering is few, energy consumption is low, operating cost is low, and under vapour compression machine, negative pressure system effect, negative pressure low-temperature evaporation in vaporization chamber, evaporation efficiency is high, is particularly suitable for heat sensitive material.MVR technology, except forming monomer M VR vapo(u)rization system, also can form multiple-effect MVR vapo(u)rization system, as the vapo(u)rization system of the patent of invention of number of patent application is 201210112034.0, denomination of invention is highly salt containing organic waste water processing method and treating apparatus thereof.
But MVR vapo(u)rization system, the indirect steam doing work through vapour compression machine of usining replaces raw steam as heating steam, the fluctuation of vapour compression machine inlet pressure can cause the fluctuation of its outlet pressure, the fluctuation of its outlet pressure can further aggravate the fluctuation of its inlet pressure again, and then cause the unstable of system operation, therefore MVR vapo(u)rization system requires continuing of indirect steam supply and stable, to guarantee the stable of vapour compression machine inlet pressure, and then guarantees the stable of system works.Limited by the problems referred to above, current MVR vapo(u)rization system cannot adopt transverse tube type falling film evaporator and can only adopt vertical pipe type falling film evaporator.
Concretely, vertical pipe type falling film evaporator, be generally cylindrical tube and longitudinally arrange, in cylindrical shell, by upper and lower two tube sheets, be divided into the cloth film chamber at top, heating clamber between the Ji Bu Moshihe separation chamber, separation chamber of bottom, in heating clamber, longitudinally arrange that some heating tubes form heating tube bundle, heating tube is fixedly mounted on respectively on upper and lower two tube sheets up and down, cloth film chamber is communicated with separation chamber through heating tube, on the corresponding barrel of heating clamber, steam inlet tube and condensation-water drain are set, cloth film indoor location distributor and filming device, on the corresponding barrel in separation chamber, steam outlet pipe and concentrated solution outlet are set.In MVR vapo(u)rization system, vapour compression machine outlet is steam inlet tube connection, the entrance steam outlet pipe connection with vertical pipe type falling film evaporator through secondary steam pipe with vertical pipe type falling film evaporator through heating steam pipe, and negative pressure system is communicated with separation chamber through negative pressure line.During work, enter the feed liquid of cloth film chamber under the effect of distributor and filming device, uniform distribution enters each heating tube and gravity nature film forming in heating tube; Heating steam enters heating clamber by steam inlet and the tube wall by heating tube heats feed liquid liquid film, and condensed water is discharged by condensation-water drain; After liquid film absorbs amount of heat, temperature improves rapidly, realizes explosive evaporation; The steam that evaporation produces accumulates one high velocity vapor stream under upper and lower negative pressure differential pressure action, and vapor stream pulls liquid film to enter separation chamber with high speed; In separation chamber, the feed liquid dilatation flash distillation after being heated, residual liquid is the concentrate of feed liquid, is pure solvent after indirect steam condensation.Because liquid film has high flowing velocity, evaporation efficiency is high, and under the guide effect of air-flow, indirect steam can enter separation chamber and fast through the buffering of separation chamber, therefore can guarantee that indirect steam continues, stable supply; Secondly, in heating clamber, heating steam is positioned at outside heating tube, is conducive to the diffusion of heating steam, and reducing heating steam supply fluctuation is also that double evaporation-cooling is produced the impact causing on evaporation process, so vertical pipe type falling film evaporator can be applicable to MVR vapo(u)rization system.
And transverse tube type falling film evaporator, lateral arrangement, comprise housing, two tube sheets, condensation tube bank and film-distributing device, tube sheet is fixed in housing, by two tube sheets and housing middle part, surround and form vaporization chamber, condensation tube bank along housing shaft to horizontally disposed in vaporization chamber, the two ends of condensation tube bank are fixed through corresponding tube sheet respectively, and by condensation, restrained the both sides that are communicated with vaporization chamber, film-distributing device is arranged in vaporization chamber and is positioned at the top of condensation tube bank; The bottom of vaporization chamber corresponding housing is provided with concentrated solution outlet, at a side pipe plate top or vaporization chamber corresponding housing top be provided with indirect steam outlet.In the vaporization chamber of transverse tube type falling film evaporator, heating steam is positioned at condenser pipe, liquid film is positioned at condenser pipe outer wall, while therefore working, affected by condensation tube bank, though there is certain movement tendency in indirect steam and feed liquid, the concrete comparatively complexity that flows of each time point, and the mobile existence of indirect steam and feed liquid influences each other, so there is fluctuation in the supply of indirect steam; Simultaneously, the work of MVR vapo(u)rization system vapour compression machine becomes periodically, while especially adopting lobed rotor compressor, and the further fluctuation of aggravation indirect steam supply of the periodicity of vapour compression machine, and then make the transverse tube type falling film evaporator cannot be for MVR vapo(u)rization system.
But the MVR vapo(u)rization system of existing employing vertical pipe type falling film evaporator, feed liquid is in vertical pipe type falling film evaporator, in the double action current downflow of deadweight, vapor stream, very high speed, for guaranteeing high efficiency, heating tube length is conventionally longer, also just cause the longitudinally highly larger of vertical pipe type falling film evaporator, so self and supporting pipeline cost are higher, and limited by vertical pipe type falling film evaporator, the miniaturization of system be cannot realize, and transportation inconvenience, maintenance difficulty caused; Secondly, in order to guarantee the steady operation of evaporimeter, require liquid film must be evenly, stable, can not be in heating tube dry film or disconnected film, so to distributor and filming device require highly, further caused the high cost of vertical pipe type falling film evaporator; They are three years old; the characteristic of vertical pipe type falling film evaporator and design feature; cause the very easily fouling of its heating tube; after heating tube fouling, affect the obstruction that heat exchange even causes heating tube; therefore need to shut down to carry out scale removal cleaning; simultaneously also determine that vertical pipe type falling film evaporator is unfavorable for evaporating highly concentrated solution, especially have under the condition that crystalline solid separates out.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of convenient transportation, maintenance is convenient and be subject to scale effect little and can realize the MVR vapo(u)rization system of miniaturization.
The technical solution adopted for the present invention to solve the technical problems is: MVR vapo(u)rization system, comprises evaporimeter, vapour compression machine, heating steam pipe, secondary steam pipe, negative pressure system and negative pressure line; Described evaporimeter adopts transverse tube type falling film evaporator, and described transverse tube type falling film evaporator comprises housing, two tube sheets, condensation tube bank and film-distributing device; By described housing, surrounding the inner chamber forming is airtight cavity, described tube sheet is fixed in housing inner chamber, along housing shaft, to described housing inner chamber, by two tube sheets, be divided into distribution cavity, recycling cavity and the vaporization chamber between distribution cavity and recycling cavity, described distribution cavity, recycling cavity and vaporization chamber are the airtight cavity of mutually isolating; Described condensation tube bank along housing shaft to horizontally disposed in vaporization chamber, and the two ends of described condensation tube bank fix through corresponding tube sheet respectively, are communicated with distribution cavity and the recycling cavity of vaporization chamber both sides by condensation tube bank; Described film-distributing device is arranged in vaporization chamber and is positioned at the top of condensation tube bank, and the bottom of described vaporization chamber corresponding housing is provided with concentrated solution outlet, and the bottom of described distribution cavity and recycling cavity corresponding housing is respectively arranged with condensation-water drain; Be provided with the steam outlet pipe that is communicated with the outside steam inlet tube with distribution cavity of transverse tube type falling film evaporator, is communicated with transverse tube type falling film evaporator outside and vaporization chamber, in described steam outlet pipe, be provided with demister.
Further, be provided with indirect steam collector in described vaporization chamber, described indirect steam collector is along housing shaft to acting on whole vaporization chamber, and described steam outlet pipe is communicated with vaporization chamber through indirect steam collector.As a kind of preferred, described indirect steam collector is in the form of slot, Open Side Down and be arranged at the middle and lower part of vaporization chamber for described groove shape indirect steam collector, and the condenser pipe of described condensation tube bank is arranged in respectively top, both sides or top and the both sides of indirect steam collector.As a kind of preferred, described indirect steam collector section is inverted U-shaped and consists of straight tube, both sides side plate, and described straight tube bottom is opening vertically, and described side plate is fixed on respectively edge of opening vertically; Straight tube and the steam outlet pipe of described indirect steam collector are one-body molded, and described indirect steam collector is supported by corresponding tube sheet away from the other end of steam outlet pipe.
As a kind of preferred, the condenser pipe of described condensation tube bank arranges by row by row, and stagger in the about condenser pipe of adjacent lines, the condenser pipe of adjacent column staggers up and down, the tube pitch in the tube pitch in each row between adjacent condenser pipe and each row between adjacent condenser pipe be all greater than condenser pipe caliber, be less than or equal to the condenser pipe caliber of twice.
Further, be provided with at least two transverse tube type falling film evaporators, through heating steam pipe, the steam inlet tube with top transverse tube type falling film evaporator is connected in described vapour compression machine outlet, described vapour compression machine entrance is communicated with end transverse tube type falling film evaporator steam outlet pipe through secondary steam pipe, and on adjacent transverse tube type falling film evaporator, the steam outlet pipe of an effect is communicated with the steam inlet tube of next effect.
Further, be provided with airtight connection chamber, described connection chamber is connected with the vaporization chamber of end transverse tube type falling film evaporator through the steam outlet pipe of end transverse tube type falling film evaporator; Be provided with and be communicated with the inside and outside indirect steam outlet of connection chamber, fixed gas outlet, described connection chamber is connected, through indirect steam outlet, with secondary steam pipe, is connected with negative pressure line through fixed gas outlet; In each transverse tube type falling film evaporator beyond top transverse tube type falling film evaporator, be provided with breather pipe, by breather pipe, be communicated with vaporization chamber and the distribution cavity of corresponding transverse tube type falling film evaporator.
Further, be provided with the level difference controller of controlling breather pipe break-make.As a kind of preferred, described level difference controller consists of the U-shaped pipe being communicated with breather pipe, and the U-shaped opening upwards of described U-shaped pipe.
Further, described housing consists of isometrical shell ring and the end plate that is detachably fixedly installed in shell ring two ends, in described shell ring, be installed with two back-up rings, described tube sheet is removably fixed in housing through corresponding back-up ring respectively, and described tube sheet is all positioned at the axial outside of corresponding back-up ring, described condenser pipe two ends are detachably fixedly installed in respectively corresponding tube sheet.
The invention has the beneficial effects as follows: adopt transverse tube type falling film evaporator to replace existing vertical pipe type falling film evaporator, heating steam is positioned at condenser pipe, and feed liquid liquid film is positioned at outside condenser pipe, is therefore subject to scale effect little, and fouling is positioned at outside pipe easy to clean; Secondly, feed liquid from top to bottom flows at different horizontal condenser pipe outer walls, and flowing velocity is low, and film forming difficulty is low, is difficult for dry film or disconnected film, therefore low to film-distributing device requirement, can effectively reduce cost; They are three years old, heat exchange efficiency and condensation section length are irrelevant, and be also condensation tube bank arrangement mode and longitudinally highly relevant with feed liquid stroke, therefore no matter horizontal still longitudinal size is all less than existing, further reduced overall cost, and it is all very convenient that transportation, maintenance, pipeline are connected, and for the miniaturization of MVR vapo(u)rization system provides may.
Accompanying drawing explanation
Fig. 1 is the axial cross-sectional schematic of the transverse tube type falling film evaporator of MVR vapo(u)rization system of the present invention;
Fig. 2 is the radially cross-sectional schematic of the transverse tube type falling film evaporator of MVR vapo(u)rization system of the present invention;
Fig. 3 is the system schematic of embodiment;
Fig. 4 is the condenser pipe scheme of installation of the transverse tube type falling film evaporator of MVR vapo(u)rization system of the present invention;
Fig. 5 is the spray equipment scheme of installation of the transverse tube type falling film evaporator of MVR vapo(u)rization system of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
MVR vapo(u)rization system of the present invention, comprises evaporimeter, vapour compression machine 212, heating steam pipe 213, secondary steam pipe 211, negative pressure system 221 and negative pressure line 222; Described evaporimeter adopts transverse tube type falling film evaporator 100, and described transverse tube type falling film evaporator 100 comprises housing 111, two tube sheets 112, condensation tube bank 120 and film-distributing device 160; By described housing 111, surrounding the inner chamber forming is airtight cavity, described tube sheet 112 is fixed in housing 111 inner chambers, along axial described housing 111 inner chambers of housing 111, by two tube sheets 112, be divided into distribution cavity 151, recycling cavity 153 and the vaporization chamber 152 between distribution cavity 151 and recycling cavity 153, described distribution cavity 151, recycling cavity 153 and vaporization chamber 152 are the airtight cavity of mutually isolating; Described condensation tube bank 120 is axially horizontally disposed in vaporization chamber 152 along housing 111, and the two ends of described condensation tube bank 120 are fixing through corresponding tube sheet 112 respectively, is communicated with distribution cavity 151 and the recycling cavity 153 of vaporization chamber 152 both sides by condensation tube bank 120; Described film-distributing device 160 is arranged in vaporization chamber 152 and is positioned at the top of condensation tube bank 120, the bottom of described vaporization chamber 152 corresponding housing 111 is provided with concentrated solution outlet 142, and the bottom of described distribution cavity 151 and recycling cavity 153 corresponding housing 111 is respectively arranged with condensation-water drain 141; Be provided with the steam outlet pipe 132 that is communicated with the outside steam inlet tube 131 with distribution cavity 151 of transverse tube type falling film evaporator 100, is communicated with transverse tube type falling film evaporator 100 outsides and vaporization chamber 152, in described steam outlet pipe 132, be provided with demister 134.
During work, feed liquid is sent into vaporization chamber 152 through film-distributing device 160, and from top to bottom flows along each condenser pipe 121 outer walls of condensation tube bank 120, natural film forming under Action of Gravity Field; Heating steam enters distribution cavity 151 by steam inlet tube 131, and enters each condenser pipe 121 through distribution cavity 151, and heating steam and feed liquid liquid film are through condenser pipe 121 tube wall heat exchange, and after heating steam heat exchange, condensation forms condensed water; Condensed water enters recycling cavity 153 and distribution cavity 151 along condenser pipe 121, and is discharged by the condensation-water drain 141 in two chambeies; In vaporization chamber 152, after liquid film absorbs amount of heat, temperature improves rapidly, and the evaporation of negative pressure low-temperature boiling, finally flow to vaporization chamber 152 bottoms flash distillation under suction function, and residual liquid is the concentrate of feed liquid and is discharged by concentrated solution outlet 142; The indirect steam that evaporation produces is under the effect of vapour compression machine 212, by steam outlet pipe 132, extracted out, through vapour compression machine 212 compressions, the raising of indirect steam temperature, pressure raising, the heat content of low-temperature level are increased, then as heating steam, again send into, realize recycling of steam.
Above-mentioned transverse tube type falling film evaporator 100, surrounds by housing 111 and tube sheet 112 distribution cavity 151, vaporization chamber 152 and the recycling cavity 153 that forms airtight and mutual isolation.Indirect steam enters after distribution cavity 151, through each condenser pipe 121, enter recycling cavity 153, affected by heat exchange condensation, air pressure in recycling cavity 153 is less than distribution cavity 151 internal gas pressures, and under differential pressure action, heating steam continues to enter condenser pipe 121, therefore only need to control the draught head between recycling cavity 153 and distribution cavity 151, can realize the control to the interior heating steam flow of condenser pipe 121, flow velocity, and to the maintaining of draught head, only need supply and the consumption of balance heating steam.Therefore, the control in conjunction with to film-distributing device 160 liquid supply pressures, flow, can realize the control to evaporation process, and it is low to control difficulty.Secondly, by the cushioning effect of distribution cavity 151 and recycling cavity 153, reduce the fluctuation of heating steam supply.Therefore, above-mentioned transverse tube type falling film evaporator 100 can guarantee the stable of evaporation process, also can continue, the stable indirect steam that provides, and meets the requirement of MVR vapo(u)rization system.
And adopting above-mentioned transverse tube type falling film evaporator 100 to replace existing vertical pipe type falling film evaporator, heating steam is positioned at condenser pipe 121, and feed liquid liquid film is positioned at outside condenser pipe 121, is therefore subject to scale effect little, and fouling is positioned at outside pipe, easy to clean; Secondly, feed liquid from top to bottom flows at different horizontal condenser pipe 121 outer walls, and flowing velocity is low, and film forming difficulty is low, is difficult for dry film or disconnected film, therefore film-distributing device 160 is required lowly, can effectively reduce cost; They are three years old, heat exchange efficiency and condenser pipe 121 length are irrelevant, and be also that 120 arrangement modes and longitudinally highly relevant are restrained in condensation with feed liquid stroke, therefore no matter horizontal still longitudinal size is all less than existing, further reduced overall cost, and it is all very convenient that transportation, maintenance, pipeline are connected, and for the miniaturization of MVR vapo(u)rization system provides may.
Therefore, in sum, MVR vapo(u)rization system of the present invention, its operation principle is same as the prior art, also be that the indirect steam that evaporimeter produces is sent into vapour compression machine through steam outlet pipe and secondary steam pipe, indirect steam is sent into evaporimeter through heating steam pipe and steam inlet tube again through vapour compression machine compression, realizes recycling of steam; And by adopting transverse tube type falling film evaporator 100, reduced overall cost, facilitate transportation, maintenance and pipeline to connect, and can realize miniaturization.Further, MVR vapo(u)rization system of the present invention is compared with existing system, its fundamental difference is the difference of evaporimeter, also be MVR vapo(u)rization system of the present invention, except transverse tube type falling film evaporator 100, all existing parts be can adopt, and can according to actual needs, monomer vapo(u)rization system or parallel system, train be formed, arrangement form is versatile and flexible, can effectively promote applying of MVR vapo(u)rization system.
Further, in described vaporization chamber 152, be provided with indirect steam collector 133, described indirect steam collector 133 is along housing 111 axial action in whole vaporization chamber 152, and described steam outlet pipe 132 is communicated with vaporization chamber 152 through indirect steam collector 133.Vapour compression machine is communicated with indirect steam collector 133 through steam outlet pipe 132, indirect steam collector 133 acts on whole vaporization chamber 152 vertically, the indirect steam that evaporation produces is under the effect of vapour compression machine 212, through indirect steam collector 133, collect, then by steam outlet pipe 132, extracted out, can be at the certain pressure reduction of the interior formation of vaporization chamber 152, and by pressure reduction, force to form indirect steam and flow, by indirect steam flow further guarantee indirect steam supply continually and steadily.
The version of above-mentioned indirect steam collector 133, setting position can be all arbitrarily, as long as can be at the stable indirect steam stream of the interior formation of vaporization chamber 152, as square, trapezoidal draft hood or tube bank etc.Specifically, take square draft hood as example, can be, condensation tube bank be arranged at vaporization chamber middle part, and draft hood is symmetricly set in condensation tube bank both sides and opening is restrained towards condensation; The tube bank of take is example, can be, restrains on the tube wall of each pipe all array bleed through hole or groove, and each pipe inserts respectively gap between the pipe of condensation tube bank 120.As a kind of preferred, described indirect steam collector 133 is in the form of slot, Open Side Down and be arranged at the middle and lower part of vaporization chamber 152 for described groove shape indirect steam collector 133, and the condenser pipe 121 of described condensation tube bank 120 is arranged in respectively top, both sides or top and the both sides of indirect steam collector 133.The version of groove shape indirect steam collector 133 can be arbitrarily, straight tube as V-shaped in section, bend pipe etc.
Indirect steam collector 133 is arranged at the middle and lower part of vaporization chamber 152, for condensation tube bank 120 provides the larger space that arranges, from space, for what improve condensation tube bank 120, longitudinally highly provides possibility; Simultaneously, can be in the upper and lower Negative Pressure Difference of the interior formation of vaporization chamber 152, effect by upper and lower Negative Pressure Difference guarantees that indirect steam flows in vaporization chamber 152 from top to bottom, and then pull feed liquid to flow downward by indirect steam stream, the feed liquid that guarantees bottom condenser pipe 121 is supplemented, strengthening is the thickness evenness of liquid film everywhere longitudinally, from feed liquid supplement for improve condensation restrain 120 possibility is longitudinally highly provided.Secondly, indirect steam collector 133 is arranged at the middle and lower part of vaporization chamber 152, and enough vapor flow spaces can be provided, to facilitate the collection of 133 pairs of indirect steams of indirect steam collector.
The setting position of steam outlet pipe 132 can be arbitrarily, but its version should adapt with the version of indirect steam collector 133, and the above-mentioned square draft hood of take is example, and steam outlet pipe should have an outlet and two entrances; Meanwhile, the setting of steam outlet pipe 132 should not affect the installation of condensation tube bank 120.For simplified structure, in example as shown in the figure, as shown in Figure 1 and Figure 2, described indirect steam collector 133 sections are inverted U-shaped and consist of straight tube, both sides side plate, and described straight tube bottom is opening vertically, and described side plate is fixed on respectively edge of opening vertically; The straight tube of described indirect steam collector 133 and steam outlet pipe 132 are one-body molded, and described indirect steam collector 133 is supported by corresponding tube sheet 112 away from the other end of steam outlet pipe 132.Above-mentioned indirect steam collector 133 can directly be fixed on corresponding tube sheet 112 by welding, flange etc. away from the other end of steam outlet pipe 132, but in example as shown in the figure, for example easy disassembly, at described indirect steam collector 133, away from the other end of steam outlet pipe 132, baffle plate is set, and inserts and in the jack on corresponding tube sheet, realize the support to indirect steam collector 133 by the spindle nose on baffle plate.
Be with above-mentioned section that inverted U-shaped indirect steam collector 133 adapts, in example as shown in the figure, as shown in Figure 1 and Figure 2, the section of described condensation tube bank 120 is inverted concave, described indirect steam collector 133 is positioned at inverted concave opening, and the condenser pipe 121 of described condensation tube bank 120 is arranged respectively top and the both sides with indirect steam collector 133.The arrangement form of this condensation tube bank 120, has had the advantage that condenser pipe 121 is arranged in respectively top and the both sides of indirect steam collector 133 concurrently, can guarantee that condensation tube bank 120 longitudinally avoid the increase of transverse tube type falling film evaporator 100 longitudinal sizes in height.For convenience of representing, in Fig. 1, only draw a condenser pipe 121.
The arrangement mode of the condenser pipe 121 of condensation tube bank 120 can have various ways, but as a kind of preferred, adopt staggered mode, also the condenser pipe 121 that is described condensation tube bank 120 arranges by row by row, and stagger in condenser pipe 121 left and right of adjacent lines, the condenser pipe 121 of adjacent column staggers up and down, the tube pitch in the tube pitch in each row between adjacent condenser pipe 121 and each row between adjacent condenser pipe 121 be all greater than condenser pipe 121 caliber, be less than or equal to condenser pipe 121 calibers of twice.Now, each condenser pipe 121 is all between adjacent four condenser pipes 121, liquid film on each condenser pipe 121 flows downward on the condenser pipe 121 of adjacent lower floor and adjacent lower floor, from top to bottom, each stock material liquid is separated, converge, spread, so guarantee thickness of liquid film evenly and feed concentration evenly; And by the continuous variation flowing to, reduce the addition of air-flow to feed liquid flowing velocity, avoid under feed liquid Rapid Flow until bottom, especially, when forcing indirect steam stream to flow, can guarantee good evaporation effect from heat exchange stroke, flow velocity, uniformity from top to bottom.Meanwhile, this arrangement mode, effectively increases the density of arranging of condenser pipe 121, increases heat exchange area.Consider arrange density and scale effect, in example as shown in the figure, as shown in Figure 2, the tube pitch in the tube pitch in each row between adjacent condenser pipe 121 and each row between adjacent condenser pipe 121 is condenser pipe 121 calibers of 1.57 times.
MVR vapo(u)rization system of the present invention according to actual needs, can be monomer vapo(u)rization system or parallel system, train.Above-mentioned monomer vapo(u)rization system, a transverse tube type falling film evaporator 100 is only set, through heating steam pipe 213, the steam inlet tube 131 with transverse tube type falling film evaporator 100 is connected in described vapour compression machine 212 outlets, and through secondary steam pipe 211, the steam outlet pipe 132 with transverse tube type falling film evaporator 100 is connected described vapour compression machine 212 entrances; Parallel system, at least two transverse tube type falling film evaporators 100 are set, through heating steam pipe 213, the steam inlet tube 131 with each transverse tube type falling film evaporator 100 is connected in described vapour compression machine 212 outlets, and through secondary steam pipe 211, the steam outlet pipe 132 with each transverse tube type falling film evaporator 100 is connected described vapour compression machine 212 entrances; Train, also form multi-effect evaporation system, be provided with at least two transverse tube type falling film evaporators 100, through heating steam pipe 213, the steam inlet tube 131 with top transverse tube type falling film evaporator 100 is connected in described vapour compression machine 212 outlets, described vapour compression machine 212 entrances are communicated with end transverse tube type falling film evaporator 100 steam outlet pipes 132 through secondary steam pipe 211, and on adjacent transverse tube type falling film evaporator 100, the steam outlet pipe 132 of an effect is communicated with the steam inlet tube 131 of next effect.
Multi-effect evaporation system, according to feed liquid and the popular difference of indirect steam, is divided into again and flow process, countercurrent flow, cross-flow flow process and advection flow process.Concretely, and flow process, feed liquid and indirect steam be in the same way successively by each single-effect evaporator, and front effect pressure is higher than aftereffect, feed liquid pumping or borrow pressure reduction to flow; Countercurrent flow, feed liquid is contrary with indirect steam flow direction, need feed liquid be delivered to the last effect that pressure is higher with pump; And cross-flow flow process is and the combination of flow process and countercurrent flow; In advection flow process, indirect steam successively by each effect, but feed liquid every effect pass in and out separately.Multi-effect evaporation system is respectively imitated the type of attachment of the concentrated solution outlet 142 of transverse tube type falling film evaporator 100 and the liquid feeding pipeline of film-distributing device 160 and the flow process that system adopts adapts, take and flow process is example, the film-distributing device 160 of top transverse tube type falling film evaporator 100 is by feed liquid liquid feeding pipeline 241 supply original liquids, beyond top transverse tube type falling film evaporator 100, the film-distributing device 160 of each transverse tube type falling film evaporator 100 is connected with concentrated solution outlet 142 liquid feeding pipeline 242 through between effect of an adjacent upper effect, usings adjacent upper one concentrate of imitating as feed liquid.
Above-mentioned top transverse tube type falling film evaporator 100 along first transverse tube type falling film evaporator 100 of steam transport path, is often called the first single-effect evaporator in multi-effect evaporation system; End transverse tube type falling film evaporator 100 is along the last transverse tube type falling film evaporator 100 of steam transport path, take as the triple effect evaporation system of figure be example, end evaporimeter is also third effect evaporator.
Example as shown in the figure, be a set of system for island desalinization, as shown in Figure 3, it comprises three transverse tube type falling film evaporators 100, and the triple effect MVR vapo(u)rization system of employing in series flow process, the type of attachment of its steam pipework and feed liquid pipeline is as mentioned above.Because desalinization is to concentrated concentration no requirement (NR), and only require fresh water, be also condensed water output, therefore according to actual used water needs, its effect number is freely-increased/decreased.
In multiple-effect MVR vapo(u)rization system, fixed gas in the main extraction system of negative pressure system, the effect of extracting is little, can imitate transverse tube type falling film evaporator 100 vavuum pump is set separately for each, a vavuum pump also can be only set and extract and respectively imitate transverse tube type falling film evaporator 100 respectively.Negative pressure system 221 can directly act on the vaporization chamber 152 of each transverse tube type falling film evaporator 100; Also can be, transverse tube type falling film evaporator 100 arranges connection chamber endways, negative pressure system 221 acts on end transverse tube type falling film evaporator 100 through connection chamber, transverse tube type falling film evaporator 100 beyond end transverse tube type falling film evaporator 100, negative pressure system 221 acts on the vaporization chamber 152 of a upper effect transverse tube type falling film evaporator 100 through the distribution cavity of adjacent next effect transverse tube type falling film evaporator 100.But for each effect transverse tube type falling film evaporator 100, arrange separately, can increase energy consumption, and increase steam loss; And a vavuum pump is only set and extracts respectively, respectively imitate transverse tube type falling film evaporator 100, pipeline connects more complicated, and controls more difficult to the pressure reduction of each effect transverse tube type falling film evaporator 100.
In example as shown in the figure, as shown in Figure 1, be provided with airtight connection chamber 154, described connection chamber 154 is connected with the vaporization chamber 152 of end transverse tube type falling film evaporator 100 through the steam outlet pipe 132 of end transverse tube type falling film evaporator 100; Be provided with and be communicated with the inside and outside indirect steam outlet 135 of connection chamber 154, fixed gas outlet 143, described connection chamber 154 is connected, through indirect steam outlet 135, with secondary steam pipe 211, is connected with negative pressure line 222 through fixed gas outlet 143; In each transverse tube type falling film evaporator 100 beyond top transverse tube type falling film evaporator 100, be provided with breather pipe 171, by breather pipe 171, be communicated with vaporization chamber 152 and the distribution cavity 151 of corresponding transverse tube type falling film evaporator 100.
By the setting of breather pipe 171, the vaporization chamber 152 of next effect transverse tube type falling film evaporator 100 is imitated vaporization chamber 152 connections of transverse tube type falling film evaporator 100 successively through the steam outlet pipe 132 the same of this effect breather pipe 171, distribution cavity 151, steam inlet tube 131 and a upper effect, thereby the vaporization chamber 152 that system is respectively imitated transverse tube type falling film evaporator 100 is interconnected, makes it possible to realize the effect to each transverse tube type falling film evaporator 100 by a set of negative pressure system; Meanwhile, by the vapour lock of breather pipe 171, negative pressure system is reduced successively by end to top to the effect of each transverse tube type falling film evaporator 100, the vacuum that guarantees each transverse tube type falling film evaporator 100 by end to top improve successively, boiling point reduces successively.
By the setting of connection chamber 154, negative pressure system 221 is connected with fixed gas outlet 143 through negative pressure line 222, vapour compression machine 212 is connected with indirect steam outlet 135 through secondary steam pipe 211, facilitate the separated of indirect steam, fixed gas and extract, the main fixed gas that extracts of negative pressure system 221, and vapour compression machine 212 extracts indirect steam, avoid the loss of indirect steam, and easy to connect.Secondly, negative pressure system 221 acts on its vaporization chamber 152 through the steam outlet pipe 132 of each transverse tube type falling film evaporator 100, the vaporization chamber 152 that directly acts on each transverse tube type falling film evaporator 100 with negative pressure system 221 is compared, and is more conducive to the stable of the interior indirect steam stream of vaporization chamber 152.
In system work process, at the interior meeting of connection chamber 154 coagulating small quantities condensed water, especially at the work initial stage, when system temperature is lower.Therefore, in order to guarantee the normal operation of system, facilitate the discharge of condensed water in connection chamber 154, described connection chamber 154 bottoms are provided with condensation-water drain 141.
The shape of above-mentioned transverse tube type falling film evaporator 100 can be arbitrarily, as square, spherical, cylindricality etc.; System arrangement form, according to actual site requirements, can arrange, horizontally disposed etc. up and down.In example as shown in the figure, as shown in Figure 1, described steam inlet tube 131 and steam outlet pipe 132 are arranged at respectively the axial two ends of transverse tube type falling film evaporator 100, and beyond top transverse tube type falling film evaporator 100, the steam inlet tube 131 of each transverse tube type falling film evaporator 100 consists of the steam outlet pipe 132 of an adjacent upper effect transverse tube type falling film evaporator 100.Owing to being directly connected between adjacent transverse tube type falling film evaporator 100, therefore, compact conformation, takes up an area littlely, and between effect, pipeline is easy to connect, and indirect steam thermal loss is little.Secondly, 151 pairs of indirect steams of distribution cavity by adjacent next effect transverse tube type falling film evaporator 100 play cushioning effect, reduce the fluctuation of respectively imitating indirect steam supply, excessive for fear of distribution cavity 151 internal gas pressures, guarantee the safety of producing, the top of distribution cavity 151 corresponding housing 111 is provided with relief port 144.Its three, can easily realize the quick-replaceable of transverse tube type falling film evaporator 100, guarantee quick reparation and the continuous running of system, when especially it is as fresh water production equipment, quick reparation and the continuous running of system, particularly crucial.
Further, in order better controlling in multiple-effect MVR vapo(u)rization system, respectively to imitate the pressure reduction between transverse tube type falling film evaporator 100, to be provided with the level difference controller of controlling breather pipe 171 break-makes.By the control to breather pipe 171 break-makes, realize the control of negative pressure system 221 to its effect degree, and then realize the control of pressure reduction between effect.Level difference controller can adopt controller initiatively, as manual, electrically operated valve etc.; Also can adopt passive adaptive controller, as bend pipes such as U-shaped pipes.
In example as shown in the figure, as shown in Figure 1, described level difference controller consists of the U-shaped pipe 172 being communicated with breather pipe 171, and the U-shaped opening upwards of described U-shaped pipe 172.During work, steam condenses in U-shaped pipe 172, and by the effect of U-shaped pipe 172 interior condensed waters, guarantees the Negative Pressure Difference of UXing Guanliang side cavity.Under stable working condition, the quantity of U-shaped pipe 172 interior condensed waters, relevant with the running parameter of evaporimeter.When working condition is unstable, the variation of the interior condensed water quantity of U-shaped pipe 172, can cause the variation of pressure reduction, and the variation of pressure reduction can cause the variation of air-flow velocity, flow, the pressure reduction air-flow that diminishes slows down, and is conducive to steam condensation, and it is anxious that pressure reduction becomes atmosphere rheology, be conducive to air-flow and take condensed water out of, so U-shaped pipe 172 can carry out self adaptation adjustment to pressure reduction simultaneously.
In order further to facilitate the maintenance of transverse tube type falling film evaporator 100, described housing 111 consists of isometrical shell ring 111a and the end plate 111b that is detachably fixedly installed in shell ring 111a two ends, in described shell ring 111a, be installed with two back-up ring 111c, described tube sheet 112 is removably fixed in housing 111 through corresponding back-up ring 111c respectively, and described tube sheet 112 is all positioned at the axial outside of corresponding back-up ring 111c, described condenser pipe 121 two ends are detachably fixedly installed in respectively corresponding tube sheet 112.Therefore, between shell ring 111a and end plate 111b, all detachable between tube sheet 112 and condenser pipe 121, and then each parts are keeped in repair and replaced, maintenance cost is low, speed is fast, especially the conveniently removing to condenser pipe 121 outer foulings.In example as shown in the figure, as Figure 1 and Figure 4, between shell ring 111a and end plate 111b, be all bolted between tube sheet 112 and back-up ring 111c, shell ring 111a and back-up ring 111c are welded and fixed; And cushion rubber 122 is set, and cushion rubber 122 sections are spill, by spill, are stuck on tube sheet 122, and condenser pipe 121 two ends are respectively through cushion rubber 122, and the strain by cushion rubber 122 is fixedly installed in the through hole of corresponding tube sheet 112 condenser pipe 121 expanded joints.
In order further to make compact conformation and to simplify pipeline, connect, in example as shown in the figure, as shown in Figure 1, be provided with the single-ended closed cylinder 113 isometrical with transverse tube type falling film evaporator 100, described cylinder 113 is connected and is surrounded and form connection chamber 154 with adjacent end plate 111b by cylinder 113 through flange with end transverse tube type falling film evaporator 100.
The film-distributing device 160 of system can adopt existing structure arbitrarily, as the device consisting of filming device and distributor.In example as shown in the figure, as shown in Figure 1, shown in Figure 5, adopt spray film-distributing device, and adapt with the distribution of condensation tube bank 120, spray film-distributing device consists of two row spray equipments, and as shown in Figure 2, two row spray equipments lay respectively at the adjacent outside of the top of indirect steam collector 133 top condenser pipes 121, cloth liquid is distributed and adapt with the evaporation capacity of each condensation tube bank 120, be also that the top cloth liquid of indirect steam collector 133 is few and both sides cloth liquid is many.In order to guarantee the liquid supply pressure of spray, each is imitated on the liquid feeding pipeline of film-distributing device 160 and is provided with feedstock pump 243.By the setting of feedstock pump 243, can effectively control the quantity delivered of feed liquid and supply with pressure, to ensure the feed liquid supply of each effect and the coupling of steam supply; And concentrate, without differential driving, can strengthen the flexibility of system layout, setting, control.
In order to facilitate maintenance and the replacing of spray equipment, as shown in Figure 5, described film-distributing device 160 adopts the spray film-distributing device consisting of spray equipment, and described spray equipment comprises feed liquid inlet pipe 161, compresses plug screw 164, joint 165, inner tube 162, spray head 163; In described joint 165, be provided with up big and down small step through-hole and be arranged on housing 111, described inner tube 162 is passed the step through-hole of joint 165 and inserts in housing 111, described spray head 163 external diameters are less than the minimum diameter of step through-hole and are installed on inner tube 162 bottoms, and described inner tube 162 tops are provided with the defining flange 167 that contacts spacing cooperation with the step of step through-hole; Described feed liquid inlet pipe 161 is positioned at outside housing 111, the step through-hole bottom interior and described feed liquid inlet pipe 161 that joint 165 is inserted in the bottom of described feed liquid inlet pipe 161 is provided with the press flange 166 that contacts spacing cooperation with defining flange 167, described inner tube 162 tops arrange internal thread, to inner tube 162 is mentioned to taking-up by screw rod; Between described defining flange 167 and press flange 166 and between defining flange 167 and the step of step through-hole, be respectively arranged with seal washer 168, described compression plug screw 164 and joint 165 threaded engagement, described compression plug screw 164 bottoms act on press flange 166 and act on defining flange 167 through press flange 166.This version, can not dismantle under the prerequisite of housing 111, realizes maintenance and the replacing of spray equipment.
Same as the prior art, MVR vapo(u)rization system of the present invention, is provided with the device that condensed water, concentrate waste heat are reclaimed equally.Concrete, as shown in Figure 3, the concentrated solution outlet 142 of end transverse tube type falling film evaporator 100 is connected with First Heat Exchanger 271 through concentrate recovery tube 251, and the condensation-water drain 141 in each chamber is connected with the second heat exchanger 272 through condensed water recovery tube 261; First feed liquid enters First Heat Exchanger 271 with concentrate heat exchange by mother tube 231, then by the first tube connector 232, enters the second heat exchanger 272 with condensed water heat exchange, realizes waste heat recovery.For fear of at extreme environment, the too low use that affects system of feed liquid preheat temperature, the use of safeguards system under the environment such as extreme weather, is also provided with electrical auxiliary heater 273, feed liquid, after the second heat exchanger 272 preheatings, enters electrical auxiliary heater 273 preheatings by the second tube connector 233; After electrical auxiliary heater 273 preheatings, by feed liquid liquid feeding pipeline 241, send into top transverse tube type falling film evaporator 100 and also first imitate transverse tube type falling film evaporator 100.Because example is as shown in the figure for desalinization, therefore, concentrate through First Heat Exchanger 271 heat exchange is discharged through concentrate delivery pipe 252, is pumped to water storage device standby through the condensed water of the second heat exchanger 272 heat exchange through drip pipe 262 by supply-water pump 263.
In native system, also there are various instrument, comprise the fluid level controller in each chamber and the flowmeter of Pressure gauge, condensed water and concentrate, the thermometer that steam, feed temperature are measured, all identical with existing horizontal tube falling film evaporation system.
Claims (10)
1.MVR vapo(u)rization system, comprises evaporimeter, vapour compression machine (212), heating steam pipe (213), secondary steam pipe (211), negative pressure system (221) and negative pressure line (222); It is characterized in that:
Described evaporimeter adopts transverse tube type falling film evaporator (100), and described transverse tube type falling film evaporator (100) comprises housing (111), two tube sheets (112), condensation tube bank (120) and film-distributing device (160); By described housing (111), surrounding the inner chamber forming is airtight cavity, described tube sheet (112) is fixed in housing (111) inner chamber, along the axial described housing of housing (111) (111) inner chamber, by two tube sheets (112), be divided into distribution cavity (151), recycling cavity (153) and be positioned at distribution cavity (151) and recycling cavity (153) between vaporization chamber (152), described distribution cavity (151), recycling cavity (153) and vaporization chamber (152) are the mutual airtight cavity of isolation;
Described condensation tube bank (120) is axially horizontally disposed in vaporization chamber (152) along housing (111), and the two ends of described condensation tube bank (120) are fixing through corresponding tube sheet (112) respectively, by condensation tube bank (120), be communicated with distribution cavity (151) and the recycling cavity (153) of vaporization chamber (152) both sides; Described film-distributing device (160) is arranged in vaporization chamber (152) and is positioned at the top of condensation tube bank (120), the bottom of described vaporization chamber (152) corresponding housing (111) is provided with concentrated solution outlet (142), and the bottom of described distribution cavity (151) and recycling cavity (153) corresponding housing (111) is respectively arranged with condensation-water drain (141);
Be provided with the steam outlet pipe (132) that is communicated with the outside steam inlet tube (131) with distribution cavity (151) of transverse tube type falling film evaporator (100), is communicated with transverse tube type falling film evaporator (100) outside and vaporization chamber (152), in described steam outlet pipe (132), be provided with demister (134).
2. MVR vapo(u)rization system as claimed in claim 1, it is characterized in that: in described vaporization chamber (152), be provided with indirect steam collector (133), described indirect steam collector (133) is along housing (111) axial action in whole vaporization chamber (152), and described steam outlet pipe (132) is communicated with vaporization chamber (152) through indirect steam collector (133).
3. MVR vapo(u)rization system as claimed in claim 2, it is characterized in that: described indirect steam collector (133) is in the form of slot, Open Side Down and be arranged at the middle and lower part of vaporization chamber (152) for described groove shape indirect steam collector (133), and the condenser pipe (121) of described condensation tube bank (120) is arranged in respectively top, both sides or top and the both sides of indirect steam collector (133).
4. MVR vapo(u)rization system as claimed in claim 3, is characterized in that: described indirect steam collector (133) section is inverted U-shaped and consists of straight tube, both sides side plate, and described straight tube bottom is opening vertically, and described side plate is fixed on respectively edge of opening vertically; The straight tube of described indirect steam collector (133) and steam outlet pipe (132) are one-body molded, and described indirect steam collector (133) is supported by corresponding tube sheet (112) away from the other end of steam outlet pipe (132).
5. MVR vapo(u)rization system as claimed in claim 1, it is characterized in that: the condenser pipe (121) of described condensation tube bank (120) arranges by row by row, and stagger in the about condenser pipe of adjacent lines (121), the condenser pipe (121) of adjacent column staggers up and down, the tube pitch in the tube pitch in each row between adjacent condenser pipe (121) and each row between adjacent condenser pipe (121) be all greater than condenser pipe (121) caliber, be less than or equal to condenser pipe (121) caliber of twice.
6. as claim 1, 2, 3, MVR vapo(u)rization system described in 4 or 5, it is characterized in that: be provided with at least two transverse tube type falling film evaporators (100), through heating steam pipe (213), the steam inlet tube (131) with top transverse tube type falling film evaporator (100) is connected in described vapour compression machine (212) outlet, described vapour compression machine (212) entrance is communicated with end transverse tube type falling film evaporator (100) steam outlet pipe (132) through secondary steam pipe (211), the steam outlet pipe (132) of the upper effect of adjacent transverse tube type falling film evaporator (100) is communicated with the steam inlet tube (131) of next effect.
7. MVR vapo(u)rization system as claimed in claim 6, it is characterized in that: be provided with airtight connection chamber (154), described connection chamber (154) is connected through the steam outlet pipe (132) of end transverse tube type falling film evaporator (100) and the vaporization chamber (152) of end transverse tube type falling film evaporator (100); Be provided with and be communicated with the inside and outside indirect steam outlet (135) of connection chamber (154), fixed gas outlet (143), described connection chamber (154) is connected, through indirect steam outlet (135) same secondary steam pipe (211), is connected through fixed gas outlet (143) same negative pressure line (222); In top transverse tube type falling film evaporator (100) each transverse tube type falling film evaporator (100) in addition, be provided with breather pipe (171), by breather pipe (171), be communicated with vaporization chamber (152) and the distribution cavity (151) of corresponding transverse tube type falling film evaporator (100).
8. MVR vapo(u)rization system as claimed in claim 7, is characterized in that: be provided with the level difference controller of controlling breather pipe (171) break-make.
9. MVR vapo(u)rization system as claimed in claim 8, is characterized in that: described level difference controller consists of the U-shaped pipe (172) being communicated with breather pipe (171), and the U-shaped opening upwards of described U-shaped pipe (172).
10. MVR vapo(u)rization system as claimed in claim 1, it is characterized in that: described housing (111) consists of isometrical shell ring (111a) and the end plate (111b) that is detachably fixedly installed in shell ring (111a) two ends, in described shell ring (111a), be installed with two back-up rings (111c), described tube sheet (112) is respectively in corresponding back-up ring (111c) is removably fixed in housing (111), and described tube sheet (112) is all positioned at the axial outside of corresponding back-up ring (111c), described condenser pipe (121) two ends are detachably fixedly installed in respectively corresponding tube sheet (112).
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| CN112221169A (en) * | 2019-07-15 | 2021-01-15 | 合众思(北京)环境工程有限公司 | MVR evaporation crystallization system |
| PL3932509T3 (en) | 2020-06-30 | 2023-04-24 | Aquafair Ab | Mechanical vapor recompression (mvr) liquid purification system |
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| LU81168A1 (en) * | 1979-04-19 | 1980-12-16 | Laguilharre Sa | IMPROVEMENT IN MECHANICAL VAPOR RECOMPRESSION EVAPORATORS |
| US5409576A (en) * | 1993-07-16 | 1995-04-25 | Tleimat; Badawi | Rotating evaporator device for the distillation or concentration of liquids |
| US8172988B2 (en) * | 2008-10-17 | 2012-05-08 | Distillation Technologies, Llc | Distillation system with vertically oriented rotating plates |
| CN102616973B (en) * | 2012-04-17 | 2013-12-04 | 常州光辉生物科技有限公司 | Method and device for processing high-saline organic wastewater |
| CN102743890A (en) * | 2012-08-03 | 2012-10-24 | 赵建安 | Improved heating power vapor recompression process and special heating power vapor recompression system for same |
| CN203291538U (en) * | 2013-06-17 | 2013-11-20 | 四川东联新能源科技有限公司 | MVR (mechanical vapor recompression) evaporation system |
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