CN205381975U - Board -like hydrophobic polymer economic benefits and social benefits MVR system - Google Patents
Board -like hydrophobic polymer economic benefits and social benefits MVR system Download PDFInfo
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- CN205381975U CN205381975U CN201520964138.3U CN201520964138U CN205381975U CN 205381975 U CN205381975 U CN 205381975U CN 201520964138 U CN201520964138 U CN 201520964138U CN 205381975 U CN205381975 U CN 205381975U
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Abstract
The utility model discloses a board -like hydrophobic polymer economic benefits and social benefits MVR system. The MVR evaporimeter is imitated in these economic benefits and social benefits MVR system no. 1 and two effect MVR evaporimeters are a reactor, is separated into one by plate type evaporator and imitates an evaporation unit and an effect condensation unit, and the slab among the plate type evaporator is the hydrophobic polymer membrane. Regard this polymer film as the heat -transfer surface substrate, can place more heat -transfer surfaces in limited volume, only the thermal resistance with 0.75 -1.5mm 316L stainless steel is suitable for the thermal resistance that the thick polymer film down of this membrane produced, can realize 2 -3's DEG C the poor heat transfer of low temperature, it supplyes to reduce the heat, alleviate the MVR installation weight, utilize the existence of flexible group such as C -N key among the polymer film simultaneously, cause ten coefficient of thermal expansions that times as much as that of the stainless steel, can accelerate droing of dirt layer, reduce the loss of the heat transfer difference in temperature.
Description
Technical field
This utility model relates to a kind of board-like hydrophobic polymer economic benefits and social benefits MVR system, belongs to water-treatment technology field.
Background technology
MVR is the abbreviation of mechanical vapor recompression technology (MechanicalVaporRecompression), and ultimate principle obtains steam and is compressed to from evaporation element evaporation and improves heat content exactly, as thermal source carry out again with.The benefit of employing MVR technology is: evaporation one effect in MVR system is equivalent to 20 to 30 effects in multiple-effect evaporation, good economy performance, and operating cost is only about the 30% of tradition multi-effect evaporator；Without external steam, unit independence is good；Adopting low-temperature evaporation technology, evaporating temperature 55-60 DEG C, also lower more than 10 DEG C than the top temperature in low-temperature multi-effect vaporising device, scaling amount reduces further.
, still there is the problems such as energy consumption is higher, heat-transfer surface ant-scaling corrosion resistance is poor, cannot realize sewage zero-discharge, water treating capacity is less in current MVR system, meanwhile, vapour compression machine energy consumption is higher and cost is high needs further improvement.Such as, the plate-type evaporator many employings S316L rustless steel used in current MVR system, as heat-transfer surface base material, on the one hand owing to stainless steel plate is thicker, causes that thermal resistance is big, and heat loss is many；On the other hand, in order to realize dropwise condensation, generally in the surface smear high polymer coating of stainless steel substrate, add the risk of coating shedding.For another example, in current multiple-effect MVR system, the recovery with two effect concentrated solutions of reclaiming of an effect concentrated solution are independent, and water treating capacity is little.
Utility model content
The purpose of this utility model is to provide a kind of board-like hydrophobic polymer economic benefits and social benefits MVR system and Waste water concentrating method, in this economic benefits and social benefits MVR system, described MVR evaporation element adopts plate-type evaporator, plate in described plate-type evaporator is hydrophobic polymer, is significantly reduced the heat and heat transfer temperature loss that require supplementation with.
The board-like hydrophobic polymer economic benefits and social benefits MVR system of one provided by the invention, it includes raw material fluid reservoir, pressurizer, preheater, an effect flow mixing device, an effect MVR device, two effect flow mixing devices, two effect MVR devices, concentrated solution recycling can and condensate water recovery device；
Described pressurizer includes booster pump and two effect circulating pumps between raw material pump, an effect circulating pump, effect；
A described effect MVR device includes effect MVR vaporizer and a compressor；A described effect MVR vaporizer is a reactor, and plate type vaporizer is separated into an effect evaporation element and an effect condensing unit, and the plate in described plate-type evaporator is hydrophobic polymer film；Steam (vapor) outlet on a described effect evaporation element is connected with described one steam inlet imitating condensing unit by being provided with the pipeline of compressor；
Described two effect MVR devices include two effect MVR vaporizer and compressors；Described two effect MVR vaporizers are a reactor, and plate type vaporizer is separated into two effect evaporation elements and two effect condensing units, and the plate in described plate-type evaporator is hydrophobic polymer film；Steam (vapor) outlet on described two effect evaporation elements is connected with described two steam inlets imitating condensing unit by being provided with the pipeline of compressor；
Described condensate water recovery device includes fluid reservoir and condensing hot air furnace tank；
The charging aperture of described raw material fluid reservoir pipeline and described preheater by being provided with described raw material pump is connected；The discharging opening of described preheater is imitated flow mixing device with described one and is connected；A described effect flow mixing device is connected with described one charging aperture imitating evaporation element by being provided with the pipeline of a described effect circulating pump, and the discharging opening of a described effect evaporation element is imitated flow mixing device with described one and is connected；A described effect flow mixing device passes through to be provided with between described effect, and the pipeline of booster pump is connected with described two effect flow mixing devices；Described two effect flow mixing devices are connected with described two charging apertures imitating evaporation element by being provided with the pipeline of described two effect circulating pumps, and described two effect evaporation elements discharging opening be divided into 2 branch roads, 1 branch road is imitated flow mixing device with described two and is connected, and another 1 branch road is connected with described concentrated solution recycling can；
The condensation-water drain of a described effect condensing unit is all connected with described fluid reservoir with described two condensation-water drains imitating condensing unit；Described fluid reservoir is connected with described condensing hot air furnace tank.
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, the thickness of described hydrophobic polymer film can be 15～60 μm.
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, the contact angle of described hydrophobic polymer film can be 110 °～150 °, water absorption rate can be 0.0042%～0.41%, thermal coefficient of expansion (20 DEG C) can be 44.1～100 μm/(m DEG C), thermal coefficient of expansion (100 DEG C) can be 39.2～140 μm/(m DEG C), fusing point can be 330～340 DEG C, glass transition temperature can be 140～220 DEG C, and heat conductivity can be 0.2～0.35W/ (m K)；The hydrophobic polymer film meeting above-mentioned condition can use, include but not limited to: polycarbonate membrane (PC film), polyether-ether-ketone film (PEEK film), Polyphenylene Sulfone film (PPSU film), polysulfone membrane (PSU film) or poly tetrafluoroethylene (PTFE film), relevant parameter is as shown in table 1.
The relevant parameter of the hydrophobic polymer film base material that table 1, this utility model adopt
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, described plate-type evaporator can be plug-in type detachable panel vaporizer；Described plate-type evaporator is become by 1～10 diaphragm fabric that can individually dismount；The specification of each described diaphragm group can be: long 0.3～0.8m, wide 0.15～0.3m, high 0.8～1.2m；Each diaphragm group can be formed by stacking by 30～60 hydrophobic polymer film diaphragms.
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, described plate-type evaporator be also arranged above liquid distributor, described liquid distributor can be overflow-type liquid distributor.The equipment Allocation Mode of plate-type evaporator and overflow-type liquid distributor, if the additional energy (1kW/m loading fountain liquid distributor and produce can be saved3), the destruction that in shell-and-tube evaporator, liquid film is caused by droplet impact tube wall can be avoided simultaneously, in evaporation element, solution film forming rate is high.
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, a described effect flow mixing device can imitate flow mixing device for adjustable type one, such as three way flow control valve, it is controlled by described one ratio imitating the flow mixing device feed liquid to entering a described effect evaporation element and described two effect evaporation elements, thus regulating one, two effect solution-treated amounts.
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, described two effect MVR devices also include flash vessel and centrifuge；Steam (vapor) outlet and the discharging opening of described two effect evaporation elements are same outlet, and the charging aperture of described flash vessel is connected with this outlet；The steam (vapor) outlet of described flash vessel is connected with described compressor；The discharging opening of described flash vessel is connected with described centrifuge；The outlet of described centrifuge is divided into 2 branch roads, and wherein 1 branch road is connected with described two effect flow mixing devices, and other 1 branch road is connected with described concentrated solution recycling can.Arranging of described flash vessel can improve evaporation capacity on the one hand, the solution in two effect evaporation elements can be avoided due to supersaturation on the other hand to precipitate out crystal, reduce the risk of fouling；The setting of described centrifuge can realize the pressure type of crystallization salinity is expelled and moisture 100% reclaims.
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, described fluid reservoir is connected with described one charging aperture imitating evaporation element also by the pipeline being provided with condensed water pumpback electromagnetic valve.By this condensed water pumpback electromagnetic valve, can pass through to imitate to described one evaporation element supplements condensed water, it is prevented that the too high boiling point elevation (BPE value is excessive) caused of solution concentration in an effect evaporation element.
Preferably, in above-mentioned board-like hydrophobic polymer economic benefits and social benefits MVR system, described compressor can be centrifugal fan (axial flow blower), contributes to reducing energy consumption, and reduces the enforcement link of shower water reduction steam superheat.
This utility model has the advantages that
(1) this utility model is by adopting board-like polymeric film to replace traditional S316L rustless steel as heat-transfer surface base material, the thickness of 25-50 μm can place more heat-transfer surface in limited volume, the thermal resistance that under this thickness, polymeric film produces is only suitable with the stainless thermal resistance of 0.75-1.5mm316L, the Low Temperature Difference heat exchange of 2-3 DEG C can be realized, reduce the heat required supplementation with, and can greatly alleviate the weight of MVR device, utilize the existence of the flexible group such as C-N key in polymeric film simultaneously, that causes decuples stainless coefficient of thermal expansion, coming off of dirt layer can be accelerated, reduce heat transfer temperature loss.
(2) this utility model is by adopting hydrophobic polymer film, dropwise condensation or part dropwise condensation can be realized in condensation side, and reduce the diameter that comes off of condensation side condensing droplet, strengthen condensation heat transfer effect, it is to avoid traditional dropwise condensation realizes the risk of method (high polymer is smeared in metal surface) common coating shedding.
(3) this utility model is by adopting an adjustable effect flow mixing device, can the solution that imitate evaporation element outflow from one be reallocated, thus regulating one, two effect solution-treated amounts.
(4) this utility model is imitated in MVR device two and is provided with a flash vessel, evaporation capacity can be promoted, treatment fluid is only in hypersaturated state in flash vessel simultaneously, in evaporation element, the solutes content for the treatment of fluid is not up to saturation solubility, can avoid precipitating out crystal due to supersaturation, thus reducing the risk of two effect evaporation element foulings；In plant maintenance, the later stage only needs flash vessel is cleaned, it is possible to decrease the service life of maintenance cost and prolongation high-polymer membrane；It is provided with a desk centrifuge, it may be achieved the pressure type of crystallization salinity is expelled and moisture 100% reclaims at flash vessel liquid outlet.
(5) this utility model imitates, one, two, the equipment Allocation Mode adopting plate evaporation unit (tradition is tubular type) and overflow-type liquid distributor in MVR device, if the additional energy (1kW/m3) loading fountain liquid distributor and produce can be saved, can avoiding the destruction that in shell-and-tube evaporator, liquid film is caused by droplet impact tube wall, in evaporation element, solution film forming rate is high simultaneously.
(6) this utility model is imitated MVR device one, two and is adopted the removable diaphragm group of plug-in type, only need to be replaced for the diaphragm group damaged, it is possible to decrease later maintenance expense, and the layout type of plug-in type is conducive to replacing and the maintenance in later stage.
(7) this utility model one, two imitate MVR devices adopt axial flow blowers replace traditional compressor, contribute to reduce energy consumption, and reduce shower water reduce steam superheat enforcement link, thus simplifying the complexity of equipment and reducing cost.
(8) this utility model is provided with condensed water pumpback electromagnetic valve between fluid reservoir and an effect MVR device circulation line, can when circulating concentrated solution concentration and being higher, imitate evaporation element to one and supplement condensed water, eliminate owing to concentration raises the risk causing boiling point elevation (BPE) value excessive.
(9) adopt this utility model system that sodium-chloride water solution is concentrated, low (relatively conventional metals MVR device (the 30kW h/m of energy consumption3) energy-conservation more than 70%).
Accompanying drawing explanation
Fig. 1 is this utility model economic benefits and social benefits MVR system flow schematic diagram.
Tu2Shi vaporizer integral structure layout figure.
Fig. 3 is the diaphragm group schematic layout pattern in plug-in type detachable panel vaporizer.
Fig. 4 is overflow-type liquid distributor fundamental diagram.
Fig. 5 is the layout (locally) of vaporizer top overflow-type liquid distributor and polymeric film.
Fig. 6 is an effect circulating pump power consumption and the graph of a relation of solution temperature rise in an effect evaporation element.
Fig. 7 is the graph of a relation of solutes content (for NaCl) in solution in the total heat exchange area of system and an effect evaporation element.
Fig. 8 is the graph of a relation that system unit processes energy consumption, the total heat exchange area of system and polymeric film both sides heat transfer temperature difference.
In Fig. 1, each labelling is as follows:
1 material liquid storage tank, 2-1 raw material pump, 2-2 mono-imitates circulating pump, booster pump between 2-3 effect, 2-4 bis-imitates circulating pump, 3 preheaters, 4-1 mono-imitates flow mixing device, 4-2 bis-imitates flow mixing device, 5-1 mono-imitates condensing unit, 5-2 mono-imitates hydrophobic polymer film, 5-3 mono-imitates evaporation element, 5-4 mono-imitates centrifugal fan, 6-1 bis-imitates condensing unit, 6-2 bis-imitates hydrophobic polymer film, 6-3 bis-imitates evaporation element, 6-4 bis-imitates centrifugal fan, 6-5 flash vessel, 7-1 centrifuge, 7-2 concentrated solution recycling can, 8-1 fluid reservoir, 8-2 vacuum pump, 8-3 condensed water pumpback electromagnetic valve, 9 condensing hot air furnace tanks.
Detailed description of the invention
The experimental technique used in following embodiment if no special instructions, is conventional method.
Material used in following embodiment, reagent etc., if no special instructions, all commercially obtain.
Below in conjunction with Figure of description, the utility model is described in further detail, but this utility model is not limited to following example.
Embodiment 1, board-like polymer economic benefits and social benefits MVR system
As shown in Figure 1, economic benefits and social benefits MVR system of the present invention, it includes raw material fluid reservoir (1), pressurizer, preheater (3), adjustable effect flow mixing device (three way flow control valve) (4-1), an effect MVR device, two effects flow mixing device (4-2), two effect MVR devices, concentrated solution recycling can (7-2) and condensate water recovery device；Pressurizer includes booster pump (2-3) and two effects circulating pump (2-4) between raw material pump (2-1), effect circulating pump (2-2), effect；Preheater is provided with charging aperture, discharging opening, condensed water import and condensation-water drain；One effect MVR device includes an effect MVR vaporizer and centrifugal fan (5-4)；One effect MVR vaporizer is a reactor, is separated into an effect evaporation element (5-3) and effect condensing unit (5-1) by plug-in type detachable panel vaporizer, and the plate in plate type heat exchanger is hydrophobic polymer film (5-2)；Plug-in type detachable panel vaporizer be arranged over an effect overflow-type liquid distributor, as shown in Fig. 2 vaporizer integral structure layout figure；One effect evaporation element (5-3) is provided with charging aperture, discharging opening and steam (vapor) outlet；One effect condensing unit (5-1) is provided with steam inlet and condensation-water drain；Steam (vapor) outlet and the steam inlet of effect condensing unit (5-1) in one effect evaporation element (5-3) are connected by being provided with the pipeline of centrifugal fan (5-4)；Two effect MVR devices include two effect MVR vaporizers, centrifugal fan (6-4) and flash vessel (6-5)；Two effect MVR vaporizers are a reactor, two effect evaporation elements (6-3) and two effects condensing unit (6-1) it are separated into by plug-in type detachable panel vaporizer, plate in plate-type evaporator is hydrophobic polymer film (6-2), plug-in type detachable panel vaporizer be arranged over an effect overflow-type liquid distributor, as shown in Fig. 2 vaporizer integral structure layout figure；Two effects evaporation element (6-3) are provided with charging aperture and discharging opening；Two effects condensing unit (6-1) are provided with steam inlet and condensation-water drain；The steam (vapor) outlet of two effects evaporation element (6-3) and the steam inlet of two effects condensing unit (6-1) are connected by being provided with the pipeline of centrifugal fan (6-4)；On flash vessel, (6-5) is provided with charging aperture, steam (vapor) outlet and discharging opening；Condensate water recovery device includes fluid reservoir (8-1) and condensing hot air furnace tank (9).
Raw material fluid reservoir (1) is connected by the charging aperture of raw material pump (2-1) with preheater (3), and the discharging opening of preheater (3) and effect flow mixing device (4-1) are connected；The charging aperture of one effect flow mixing device (4-1) pipeline and effect evaporation element (5-3) by being provided with an effect circulating pump (2-2) is connected, and the discharging opening of effect evaporation element (5-3) and effect flow mixing device (4-1) are connected；One effect flow mixing device (4-1) is imitated flow mixing device (4-2) and is connected by the pipeline of booster pump (2-3) between setting effectively with two；The charging aperture of two effects flow mixing device (4-2) pipeline and two effects evaporation element (6-3) by being provided with two effect circulating pumps (2-4) is connected, and two effect evaporation element (6-3) discharging opening be connected with the charging aperture of flash vessel (6-5), the steam (vapor) outlet of flash vessel (6-5) is connected with centrifugal fan (6-4), the discharging opening of flash vessel (6-5) is connected with centrifuge (7-1), centrifuge (7-1) is divided into 2 branch roads, 1 branch road is connected with two effects flow mixing device (4-2), another 1 branch road is connected with concentrated solution recycling can (7-2)；The condensation-water drain of one effect condensing unit (5-1) and the condensation-water drain of two effects condensing unit (5-2) are all connected with fluid reservoir (8-1)；The outlet of fluid reservoir (8-1) is divided into 3 branch roads, 1st branch road is connected with the condensed water import of preheater (3), the condensation-water drain of preheater (3) is connected with condensing hot air furnace tank (9), 2nd branch road and a vacuum pump (8-2) are connected, and the 3rd branch road is connected by the pipeline and a charging aperture imitating evaporation element (5-3) being provided with condensed water pumpback electromagnetic valve.
nullIn above-mentioned 1st effective evaporator and 2nd effect evaporator，The structural representation of plug-in type detachable panel vaporizer is as shown in Figure 3，It is become by 10 diaphragm fabric，Each diaphragm group can individually be dismantled，The specification of each diaphragm group is: long 700mm、Wide 300mm、High 1400mm，Each diaphragm group is formed by stacking (this example employing modified polyetheretherketonefiber film by 80 polymeric films，I.e. modified PE EK film，Prepared by method of electrostatic spinning，This film component contains the polyureas of 50%)，The parameter of this polymeric film is as follows: thermal conductivity is 0.25W/ (m K)、Water absorption rate is 0.21%、CET (20 DEG C) is 44.1 μm/(m DEG C)、CET (20 DEG C) is 39.2 μm/(m DEG C)、Fusing point is 358 DEG C、Glass transition temperature is 143 DEG C、Specific heat is 2J/g DEG C、Contact angle is 145.7 °.Under the experiment condition that solution load is 0.145kg/ (m s), when solution film forming rate is 0.47 ± 0.03, average overall heat-transfer coefficient is up to 1570 ± 181W/ (m2·K)；When solution film forming rate is 1, theoretical average overall heat-transfer coefficient is up to 3375W/ (m2·K).Meanwhile, connect cutting on cover plate at diaphragm top, it is ensured that in spray process feed liquid can uniform flow, every diaphragm both sides are sealed by epoxy resin, it is ensured that an effect evaporation element and the sealing effectiveness imitating condensing unit and an isolation effect.Feed liquid 0.26m is processed according to unit membrane3/(m2D) calculating, single diaphragm group can process 20.4m every day3Feed liquid.
The dismantled and assembled diaphragm group number of plug-in type in an effect MVR device in the present embodiment is 10, but when actual device produces, can need to be changed according to feed liquid treating capacity, simultaneously, the size of single diaphragm group and the size of every diaphragm all can be changed, and it all should be encompassed in the middle of scope of the presently claimed invention.
In the present embodiment, the fundamental diagram of overflow-type liquid distributor is as shown in Figure 4, and the layout of vaporizer top overflow-type liquid distributor and hydrophobic polymer film is as shown in Figure 5.By Fig. 4 and Fig. 5 it can be seen that being equipped with of plate evaporation unit and overflow-type liquid distributor, it is to avoid the damage to liquid film of the conventional tubular evaporation element, save simultaneously and the energy consumption that fountain liquid distributor produces additionally is set.
Adjustable effect flow mixing device (three way flow control valve) the concretely denomination of invention that the present embodiment adopts is " three way flow control valve ", application number is the three way flow control valve disclosed in 01109412.5, and its structure is as follows: this control valve includes the hollow cylindrical shell of a both ends open.It is respectively supported at first and second valve chambers in housing the first and second end, first valve chamber has first refrigerant discharge hole and first aperture, second valve chamber has a second refrigerant discharge orifice and a cold-producing medium access aperture and second aperture therebetween.First and second valvings are axially movably placed in two valve chambers respectively to control the opening ratios in the first and second apertures.Activate device and be arranged between two valve chambers for controlling two valvings and making two valve chambers be interconnected.The ratio of the feed liquid entering a described effect evaporation element and described two effect evaporation elements can be controlled by this three-way control valve, thus regulating one, two effect solution-treated amounts.
In use, technological process is as follows for above-mentioned MVR device:
Material liquid in raw material liquid storage pump (1) enters in preheater (3) under the effect of raw material pump (2), and the temperature of material liquid raises.Feed liquid after intensification enters an effect evaporation element by effect circulating pump (2-2), heat exchange is carried out with the steam in effect condensing unit (5-1) by the polymeric film (5-2) of evaporator surface, feed liquid absorbs evaporation after heat is warming up to boiling point and forms steam, and condensation heat release in an effect condensing unit (5-1) is delivered in formula blower fan (5-4) compression by centrifugation.Concentrated solution in one effect evaporation element (5-3) imitates flow mixing device (4-1) shunting through one, after mixing with material liquid mostly as circulation fluid, enter in effect evaporation element (5-3) and spray, fraction booster pump (2-3) through between effect enters in two effect evaporation elements (6-3) and carries out heat exchange by the polymeric film (6-2) of evaporator surface with the steam in two effects condensing unit (6-1), feed liquid is imitated heat absorption in evaporation element (6-3) two and is warming up to close to boiling point, enter flash vessel (6-5) part flash-off of steam, condensation heat release in two effect condensing units (6-1) delivered to by steam formula blower fan (6-4) by centrifugation.Steam condensation in one or two effect condensing units enters and removes fixed gas in fluid reservoir (8-1) after generating condensed water, after reclaiming heat through preheater (3), enters condensing hot air furnace tank (9).After unevaporated feed liquid machine by centrifugation (7-1) removes crystal in flash vessel (6-5), imitate after flow mixing device (4-2) feed liquid next with an effect flow mixing device conveying mixes through two and go successively to two effect evaporation elements (6-3) participation evaporations.
Embodiment 2, feed liquid total dissolved solidss content control
When adopting the economic benefits and social benefits MVR system in embodiment 1 that feed liquid is concentrated, the BPE value of feed liquid and boiling point elevation value are within the scope of 0-2.1 DEG C.According to solution boiling point rising law (inference of Raoult's law, calculating formula
Wherein, Δ T is boiling point liter, K；R is gas constant, and for steam, R is 0.462kJ/ (kg K)；T0For the boiling temperature of neat solvent, K；γ0For neat solvent at T0Time molal latent heat of vaporization, kJ/kg；For the molar fraction increment of solute in weak solution.
It is the boiling point liter relative to pure solution due to what calculate herein, therefore can regard as and add solute, i.e. the molar fraction increment of solute to the neat solvent that concentration is 0Molar fraction (x with solute2) in the same size.),
The initial calculation condition set by the present invention, T0For 328K (55 DEG C), γ0For 2595.84kJ/kg, in solution, mass concentration is the molar concentration x of the sodium chloride of 13.89%2It is 0.047, can be calculated, the mean boiling point of the sodium chloride solution in one effect evaporation element rises less than 0.95 DEG C, and the mean boiling points of the sodium chloride solution in two effect evaporation elements rise less than 1.15 DEG C, therefore thinks that the BPE value of feed liquid and boiling point elevation value are within the scope of 0-2.1 DEG C.
Therefore, total dissolved solidss content (TDS) value entered in 1st effective evaporator in feed liquid need to control in the scope of 0-3.5%.
Can realize by the following method when being embodied as:
By an allocation proportion imitating flow mixing device control and regulation one, two effect feed liquid, if TDS instrument detects that in system, feed liquid TDS value is too high simultaneously, condensed water pumpback electromagnetic valve (8-3) can being controlled by output signal and a circulation line imitated in MVR device is carried out moisturizing, diluting thus entering front the completing of effect evaporation element (5-3) in feed liquid.
Embodiment 3, one imitates circulation pump power and the relation of solution temperature rise size in an effect evaporation element
Illustrate for the NaCl solution that Solute mass fraction is 5%, as shown in Figure 6, one effect circulating pump (2-2) power consumption reduces along with a raising imitating evaporation element (5-3) interior solution temperature rise, and reason is that temperature rise is more high, and required circulation solution amount is more few；Meanwhile, during temperature rise 1.5-2.5 DEG C, pump merit declines comparatively obvious, and the limit of temperature rise being therefore comparatively suitable for should be 2.5-5.5 DEG C；It can also be seen that from Fig. 3 pump merit is had no significant effect by the evaporating temperature (in figure the evaporating temperature of three curves respectively 50 DEG C, 60 DEG C and 70 DEG C) of solution an effect evaporation element (5-3).
The relation of solutes content in the total heat exchange area of embodiment 4, system and an effect evaporation element
Illustrate for the NaCl solution that Solute mass fraction is 5%, as shown in Figure 7, include the total heat exchange area of system of an effect evaporation element (5-3), two effects evaporation element (6-3) and preheater (3), reduce with an increase imitating the NaCl meltage of concentrated solution in evaporation element (5-3), namely improving the cycles of concentration of solute in effect evaporation element (5-3) and advantageously reduce heat exchange area, this imitates MVR device solution-treated amount mainly due to one and imitates MVR device far above two；Meanwhile, improving the evaporating temperature of solution in effect evaporation element (5-3) and can reduce the total heat exchange area of system, what contribute to minimizing material uses and reduces cost, but adds the risk of polymer surfaces fouling.
Embodiment 5, system unit process energy consumption, relation between the total heat exchange area of system and polymeric film both sides heat transfer temperature difference
Illustrate for the NaCl solution that Solute mass fraction is 5%, as shown in Figure 8, reduction along with polymeric film both sides heat transfer temperature difference, the energy consumption of system unit processing area reduces, but total heat exchange area of system raises, therefore, the heat transfer temperature difference reducing polymeric film both sides contributes to the reduction of system unit process energy consumption, but the demand to the total heat exchange area of system can be increased, how between operating cost and a construction cost, to find balance, relatively crucial in system design process.
Embodiment 6, about reduce energy consumption
This example is to process air quantity (22454m3/ h) and blast (1800Pa) illustrate for example, the 4-72-8D-1450 type blower fan of company limited of Chuan Yi ventilation installation, Zibo selected by blower fan, and parameter is as shown in table 2.
Centrifugal blower (4-72-8D-1450 type) parameter that table 2, suggestion are used instead
Being known by table 2, maximum fan shaft power is 18.5kW, and stock solution amount treating capacity is 2.41m3/ h, then unit volume material liquid processes energy consumption and is up to 7.68kW h/m3, and the unit volume material liquid of other energy consumption equipment selected (feed pump, vacuum pump, circulating pump) processes energy consumption sum less than 1kW h/m3, the unit volume material liquid that namely MVR system is total processes energy consumption less than 8.68kW h/m3, relatively conventional metals MVR device (30kW h/m3) energy-conservation more than 70%.
Embodiment 7, utilize this utility model economic benefits and social benefits MVR system to 5% sodium chloride (NaCl) feed liquid concentrate
Utilizing the economic benefits and social benefits MVR system in embodiment 1 that ammonium chloride (NaCl) solution that mass concentration is 5% is evaporated crystallization, process regulation is as follows:
1) allocation proportion utilizing effect flow mixing device control and regulation one, a two effect feed liquid is 3:1, if TDS instrument detects that in system, feed liquid TDS value is too high simultaneously, condensed water pumpback electromagnetic valve (8-3) can be controlled by output signal and a circulation line imitated in MVR device is carried out moisturizing, thus entering effect evaporation element (5-3) front sodium chloride by 5% in feed liquid to be diluted in less than 3.5%.
2) evaporating temperature of the sodium chloride feed liquid in an effect evaporation element is 55 DEG C, and temperature rise control is in the scope of 2.5-5.5 DEG C.
3) heat transfer temperature difference of polymeric film both sides is 0～0.95 DEG C, and the total heat exchange area of system is 784m2。
4) select the 4-72-8D-1450 type blower fan of company limited of Chuan Yi ventilation installation, Zibo as compressor.
In the present embodiment, under above-mentioned process conditions, process 1m3Brackish water needs to consume electric energy 8.68 degree, produces condensed water 0.93t simultaneously.In the present embodiment, after brine strength is concentrated into 64%, machine separates and precipitates out by centrifugation, and in produced condensed water, contained salinity is less than 0.05wt%.
Above example is only in order to illustrate this utility model and and unrestricted technical scheme described in the invention；Therefore, although this specification with reference to the above embodiments to present invention has been detailed description, but it will be understood by those within the art that, still technical scheme can be modified or equivalent replacement, without deviating from objective and the scope of technical solution of the present invention, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (9)
1. a board-like hydrophobic polymer economic benefits and social benefits MVR system, it includes raw material fluid reservoir, pressurizer, preheater, an effect flow mixing device, an effect MVR device, two effect flow mixing devices, two effect MVR devices, concentrated solution recycling can and condensate water recovery device；
Described pressurizer includes booster pump and two effect circulating pumps between raw material pump, an effect circulating pump, effect；
A described effect MVR device includes effect MVR vaporizer and a compressor；A described effect MVR vaporizer is a reactor, and plate type vaporizer is separated into an effect evaporation element and an effect condensing unit, and the plate in described plate-type evaporator is hydrophobic polymer film；Steam (vapor) outlet on a described effect evaporation element is connected with described one steam inlet imitating condensing unit by being provided with the pipeline of compressor；
Described two effect MVR devices include two effect MVR vaporizer and compressors；Described two effect MVR vaporizers are a reactor, and plate type vaporizer is separated into two effect evaporation elements and two effect condensing units, and the plate in described plate-type evaporator is hydrophobic polymer film；Steam (vapor) outlet on described two effect evaporation elements is connected with described two steam inlets imitating condensing unit by being provided with the pipeline of compressor；
Described condensate water recovery device includes fluid reservoir and condensing hot air furnace tank；
The charging aperture of described raw material fluid reservoir pipeline and described preheater by being provided with described raw material pump is connected；The discharging opening of described preheater is imitated flow mixing device with described one and is connected；A described effect flow mixing device is connected with described one charging aperture imitating evaporation element by being provided with the pipeline of a described effect circulating pump, and the discharging opening of a described effect evaporation element is imitated flow mixing device with described one and is connected；A described effect flow mixing device passes through to be provided with between described effect, and the pipeline of booster pump is connected with described two effect flow mixing devices；Described two effect flow mixing devices are connected with described two charging apertures imitating evaporation element by being provided with the pipeline of described two effect circulating pumps, and described two effect evaporation elements discharging opening be divided into 2 branch roads, 1 branch road is imitated flow mixing device with described two and is connected, and another 1 branch road is connected with described concentrated solution recycling can；
The condensation-water drain of a described effect condensing unit is all connected with described fluid reservoir with described two condensation-water drains imitating condensing unit；Described fluid reservoir is connected with described condensing hot air furnace tank.
2. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1, it is characterised in that: the thickness of described hydrophobic polymer film is 15～60 μm；The contact angle of described hydrophobic polymer film is 110 °～150 °, water absorption rate is 0.0042%～0.41%, 20 DEG C of thermal coefficient of expansions are 44.1～100 μm/(m DEG C), 100 DEG C of thermal coefficient of expansions are 39.2～140 μm/(m DEG C), fusing point is 330～340 DEG C, glass transition temperature is 140～220 DEG C, and heat conductivity is 0.2～0.35W/ (m K).
3. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1 and 2, it is characterised in that: described hydrophobic polymer film is polycarbonate membrane, polyether-ether-ketone film, Polyphenylene Sulfone film, polysulfone membrane or poly tetrafluoroethylene.
4. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1 and 2, it is characterised in that: described plate-type evaporator is plug-in type detachable panel vaporizer；Described plate-type evaporator is become by 1～10 diaphragm fabric that can individually dismount；The specification of each described diaphragm group is: long 500～1500mm, wide 200～600mm, high 1000～3000mm；Each diaphragm group is formed by stacking by 50～100 hydrophobic polymer film diaphragms.
5. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1 and 2, it is characterised in that: described plate-type evaporator be also arranged above liquid distributor, described liquid distributor is overflow-type liquid distributor.
6. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1 and 2, it is characterised in that: a described effect flow mixing device is that adjustable type one imitates flow mixing device, and the ratio of the feed liquid entering a described effect evaporation element and described two effect evaporation elements is controlled.
7. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1 and 2, it is characterised in that: described two effect MVR devices also include flash vessel and centrifuge；Steam (vapor) outlet and the discharging opening of described two effect evaporation elements are same outlet, and the charging aperture of described flash vessel is connected with this outlet；The steam (vapor) outlet of described flash vessel is connected with described compressor；The discharging opening of described flash vessel is connected with described centrifuge；The outlet of described centrifuge is divided into 2 branch roads, and wherein 1 branch road is connected with described two effect flow mixing devices, and other 1 branch road is connected with described concentrated solution recycling can.
8. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1 and 2, it is characterised in that: described fluid reservoir connects with described one charging aperture imitating evaporation element also by the pipeline being provided with condensed water pumpback electromagnetic valve.
9. board-like hydrophobic polymer economic benefits and social benefits MVR system according to claim 1 and 2, it is characterised in that: described compressor is centrifugal fan.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105347413A (en) * | 2015-11-26 | 2016-02-24 | 清华大学 | Plate-type hydrophobic polymer double-effect MVR (Mechanical Vapor Recompression) system and wastewater concentration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105347413A (en) * | 2015-11-26 | 2016-02-24 | 清华大学 | Plate-type hydrophobic polymer double-effect MVR (Mechanical Vapor Recompression) system and wastewater concentration method |
| CN105347413B (en) * | 2015-11-26 | 2017-12-19 | 清华大学 | A kind of board-like hydrophobic polymer economic benefits and social benefits MVR systems and Waste water concentrating method |
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