CN105347413B - A kind of board-like hydrophobic polymer economic benefits and social benefits MVR systems and Waste water concentrating method - Google Patents
A kind of board-like hydrophobic polymer economic benefits and social benefits MVR systems and Waste water concentrating method Download PDFInfo
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- CN105347413B CN105347413B CN201510845941.XA CN201510845941A CN105347413B CN 105347413 B CN105347413 B CN 105347413B CN 201510845941 A CN201510845941 A CN 201510845941A CN 105347413 B CN105347413 B CN 105347413B
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Abstract
The invention discloses a kind of board-like hydrophobic polymer economic benefits and social benefits MVR systems.An effect MVR evaporators and two effect MVR evaporators in economic benefits and social benefits MVR systems are a reactor, and plate type evaporator is separated into an effect evaporation element and an effect condensing unit, and the plate in plate-type evaporator is hydrophobic polymer film.The thickness of the hydrophobic polymer film is 15~60 μm；Contact angle 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 thermal conductivity factor is 0.2~0.35W/ (mK).Using the polymer film as heat-transfer surface base material, more heat-transfer surfaces can be placed in finite volume, thermal resistance caused by polymer film is only suitable with the thermal resistance of 0.75 1.5mm 316L stainless steels under the thickness, 23 DEG C of Low Temperature Difference heat exchange can be achieved, reduce heat supplement, mitigate MVR installation weights, the presence of the flexible groups such as C N keys in polymer film is utilized simultaneously, cause to decuple the coefficient of thermal expansion of stainless steel, coming off for dirty layer can be accelerated, reduce heat transfer temperature loss.
Description
Technical field
The present invention relates to a kind of board-like hydrophobic polymer economic benefits and social benefits MVR systems and Waste water concentrating method, belong to water process skill
Art field.
Background technology
MVR is mechanical vapor recompression technology (Mechanical Vapor Recompression) abbreviation, substantially former
Reason is exactly to be compressed to evaporating to obtain steam from evaporation element and improve heat content, is reused as thermal source.Using MVR
The benefit of technology is：Evaporation one in MVR systems is imitated equivalent to 20 to 30 effects in multiple-effect evaporation, good economy performance, operating cost
Only 30% or so of traditional multi-effect evaporator；It is good without external steam, unit independence；Using low-temperature evaporation technology, evaporation
55-60 DEG C of temperature, also lower more than 10 DEG C than the top temperature in low-temperature multi-effect vaporising device, scaling amount is further reduced.
Current MVR systems, still have that energy consumption is higher, heat-transfer surface ant-scaling corrosion resistance is poor, can not realize dirt
The problems such as water zero discharge, smaller water process amount, meanwhile, vapour compression machine energy consumption is higher and cost is high needs further improvement.
Such as the plate-type evaporator used in current MVR systems more using S316L stainless steels as heat-transfer surface base material, on the one hand by
It is thicker in stainless steel plate, cause thermal resistance big, heat loss is more；On the other hand, in order to realize dropwise condensation, generally in stainless base steel
The surface smear high polymer coating of material, add the risk of coating shedding.For another example, in current multiple-effect MVR systems, an effect
The recovery of concentrate and the recovery of two effect concentrates are independent, and water process amount is small.
The content of the invention
It is an object of the invention to provide a kind of board-like hydrophobic polymer economic benefits and social benefits MVR systems and Waste water concentrating method, this pair
Imitate in MVR systems, use plate-type evaporator in the MVR evaporation elements, the plate in the plate-type evaporator is hydrophobicity
Polymer, it is significantly reduced the heat required supplementation with and heat transfer temperature loss.
A kind of economic benefits and social benefits function of mechanical steam recompression system provided by the invention, it includes raw material fluid reservoir, supercharging device, preheating
Device, an effect flow mixing device, an effect MVR devices, two effect flow mixing devices, two effect MVR devices, concentrate recycling can and condensing hot air furnace dress
Put；
The supercharging device includes booster pump and two effect circulating pumps between raw material pump, an effect circulating pump, effect；
The one effect MVR devices include an effect MVR evaporators and compressor；The one effect MVR evaporators are a reactor,
Plate type evaporator is separated into an effect evaporation element and an effect condensing unit, and the plate in the plate-type evaporator gathers for hydrophobicity
Compound film；The steaming that steam (vapor) outlet on the one effect evaporation element passes through the pipeline provided with compressor and described one effect condensing unit
Vapour entrance is connected；
The two effect MVR devices include two effect MVR evaporators and compressor；The two effects MVR evaporators are a reactor,
Plate type evaporator is separated into two effect evaporation elements and two effect condensing units, and the plate in the plate-type evaporator gathers for hydrophobicity
Compound film；The steaming that steam (vapor) outlet on the two effects evaporation element passes through the pipeline provided with compressor and described two effect condensing units
Vapour entrance is connected；
The condensate water recovery device includes fluid reservoir and condensing hot air furnace tank；
The raw material fluid reservoir is connected by the pipeline provided with the raw material pump with the charging aperture of the preheater；It is described
The discharging opening of preheater is connected with described one effect flow mixing device；The one effect flow mixing device passes through the pipe provided with described one effect circulating pump
Road is connected with the charging aperture of described one effect evaporation element, and the discharging opening of the effect evaporation element and described one effect flow mixing device
It is connected；The one effect flow mixing device provided with the pipeline of booster pump between the effect with described two effect flow mixing devices by being connected；It is described
Two effect flow mixing devices are connected by the pipeline provided with described two effect circulating pumps with the charging aperture of described two effect evaporation elements, and described
The discharging openings of two effect evaporation elements are divided into 2 branch roads, and 1 branch road is imitated flow mixing devices with described two and is connected, another 1 branch road with it is described
Concentrate recycling can is connected；
It is described one effect condensing unit condensation-water drain and it is described two effect condensing unit condensation-water drain with the storage
Flow container is connected；The fluid reservoir is connected with the condensing hot air furnace tank.
Preferably, in above-mentioned vapor recompression system, the thickness of the hydrophobic polymer film can be 15~60 μm.
Preferably, in above-mentioned vapor recompression system, the contact angle of the 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, thermal conductivity factor can be 0.2~0.35W/ (mK)；Meet that the hydrophobic polymer film of above-mentioned condition can be used, including but not
It is limited to：Polycarbonate membrane (PC films), polyether-ether-ketone film (PEEK films), PPSU film (PPSU films), PS membrane (PSU films) or poly- four
Fluoride film (PTFE film), relevant parameter is as shown in table 1.
The relevant parameter for the hydrophobic polymer film base material that table 1, the present invention use
Preferably, in above-mentioned vapor recompression system, the plate-type evaporator can be plug-in type detachable panel evaporator；
The plate-type evaporator is made up of 1~10 diaphragm that can individually dismount group；Each the specification of the diaphragm group can be：Long 0.3
~0.8m, wide 0.15~0.3m, high 0.8~1.2m；Each diaphragm group can be superimposed by 30~60 hydrophobic polymer film diaphragms
Form.
Preferably, in above-mentioned vapor recompression system, liquid distributor, the cloth liquid are additionally provided with above the plate-type evaporator
Device can be overflow-type liquid distributor.The equipment Allocation Mode of plate-type evaporator and overflow-type liquid distributor, fountain is loaded if can save
Liquid distributor and caused additional energy (1kW/m3), while drop shock tube wall in shell-and-tube evaporator can be avoided to cause liquid film
Destruction, solution film forming rate is high in evaporation element.
Preferably, in above-mentioned vapor recompression system, the effect flow mixing device can be that adjustable type one imitates flow mixing device, such as three
Through-flow control valve, the feed liquid of evaporation element is imitated to entering described one effect evaporation element and described two by described one effect flow mixing device
Ratio be controlled, so as to adjust one, two effect solution treating capacities.
Preferably, in above-mentioned vapor recompression system, the two effects MVR devices also include flash vessel and centrifuge；It is described
The steam (vapor) outlet and discharging opening of two effect evaporation elements are same outlet, and the charging aperture of the flash vessel is connected with the outlet；Institute
The steam (vapor) outlet for stating flash vessel is connected with the compressor；The discharging opening of described flash vessel is connected with the centrifuge；
The outlet of the centrifuge is divided into 2 branch roads, is connected wherein 1 branch road imitates flow mixing devices with described two, in addition 1 branch road and institute
Concentrate recycling can is stated to be connected.On the one hand the setting of the flash vessel can improve evaporation capacity, two effects on the other hand can be avoided to steam
Solution in bill member separates out crystal due to supersaturation, reduces the risk of fouling；The setting of the centrifuge can be achieved to knot
The pressure type of brilliant salinity expels to be reclaimed with moisture 100%.
Preferably, in above-mentioned vapor recompression system, the fluid reservoir also passes through the pipe provided with condensed water pumpback magnetic valve
Road is connected with the charging aperture of described one effect evaporation element., can be by being steamed to described one effect by the condensed water pumpback magnetic valve
Condensed water is supplemented in bill member, prevent the too high caused boiling point elevation of solution concentration in an effect evaporation element (BPE values are excessive).
Preferably, in above-mentioned vapor recompression system, the compressor can be centrifugal fan (axial flow blower), contribute to
Energy consumption is reduced, and reduce shower water to reduce the implementation link of steam superheat.
Inorganic salts waste water is carried out using any of the above-described kind of vapor recompression system invention further provides a kind of
The method of concentration, comprises the following steps：
(1) the waste water material liquid being stored in raw material liquid storage tank is delivered in preheater in the presence of raw material pump；Through
The feed liquid for crossing preheating enters an effect flow mixing device, and an effect evaporation element is entered in the presence of an effect circulating pump and is evaporated；Evaporation
Enter an effect condensing unit after obtained raise steam；In the evaporation process, feed liquid and institute in the effect evaporation element
The steam stated in an effect condensing unit is exchanged heat by the hydrophobic polymer film in plate-type evaporator；
(2) feed liquid after described one effect evaporation element is concentrated by evaporation is divided into 2 strands, is designated as A respectively by an effect flow mixing device
Stock and B stocks；A-share feed liquid is back in an effect evaporation element in the presence of an effect booster pump and participation evaporation, B is mixed with material liquid
Stock material liquid is entered in two effect evaporation elements by booster pump between effect and two effect flow mixing devices to be evaporated；Evaporate obtained raise steam
(preferably being boosted to using axial fan close to saturation) enters two effect condensing units afterwards；In the evaporation process, two effect
Feed liquid in evaporation element passes through the hydrophobic polymer film in plate-type evaporator with the steam in described two effect condensing units
Heat exchange；The obtained condensed water that exchanges heat is recovered in condensing hot air furnace tank by fluid reservoir；
(3) feed liquid after described two effect evaporation elements are concentrated by evaporation is divided into 2 strands, is designated as C respectively by two effect flow mixing devices
Stock and D stocks；C stock materials liquid is back in two effect evaporation elements in the presence of two effect booster pumps with being flowed out out of an effect evaporation element
Feed liquid mixing participate in evaporation, D stock material liquid be concentrated liquid recycling can recovery；The obtained condensed water that exchanges heat is recovered by fluid reservoir
Into condensing hot air furnace tank.
Preferably, in above-mentioned method, the condensed water in the fluid reservoir as described in solenoid valve control enters described one effect and evaporated
In the circulation line of unit so that the total dissolved solidss content value into the feed liquid in an effect evaporation element is 0~3.5%, but
It is not 0.
Preferably, in above-mentioned method, the effect flow mixing device is that adjustable type one imitates flow mixing device, controls the body of A-share and B stocks
Product ratio is (1~5)：1, more preferably 3：1.
Preferably, in above-mentioned method, the evaporating temperature in the control one effect evaporation element can be 54~57 DEG C.
Preferably, in above-mentioned method, in the 1st effective evaporator, the heat transfer temperature difference of the hydrophobic polymer film both sides
It can be 1.1~3.1 DEG C.
Preferably, in above-mentioned method, the system including an effect evaporation element, two effect evaporation elements and preheater is total
Heat exchange area can be 190~250m2。
Preferably, in above-mentioned method, the mass concentration of the inorganic salts waste water can be 1%~15%；The waste water can
To contain Cr, SQ42-、Na+、Ca2+Waste water (such as sodium-chloride water solution, potassium chloride of the high concentration dissolubility inorganic salts of plasma
The aqueous solution, calcium chloride water, aqueous ammonium nitrate solution etc.).
The present invention has the advantages that：
(1) present invention replaces traditional S316L stainless steels as heat-transfer surface base material, 25- by using board-like polymer film
50 μm of thickness can place more heat-transfer surfaces in limited volume, under the thickness thermal resistance caused by polymer film only with
The thermal resistance of 0.75-1.5mm 316L stainless steels is suitable, and 2-3 DEG C of Low Temperature Difference heat exchange can be achieved, reduce the heat required supplementation with, and
Can greatly mitigate the weight of MVR devices, while using the presence of the flexible groups such as C-N keys in polymer film, caused by ten times
In the coefficient of thermal expansion of stainless steel, coming off for dirty layer can be accelerated, reduce heat transfer temperature loss.
(2) present invention can realize that dropwise condensation or part drop-wise are cold by using hydrophobic polymer film in condensation side
It is solidifying, and reduce the diameter that comes off of condensation side condensing droplet, strengthen condensation heat transfer effect, avoid traditional dropwise condensation realization side
The risk of the common coating shedding of method (metal surface smearing high polymer).
(3) present invention, can be to carrying out by using adjustable one effect flow mixing device from the solution of an effect evaporation element outflow
Reallocation, so as to adjust one, two effect solution treating capacities.
(4) present invention is provided with a flash vessel in two effect MVR devices, can lift evaporation capacity, while treatment fluid only exists
Be in hypersaturated state in flash vessel, the solutes content for the treatment of fluid is not up to saturation solubility in evaporation element, can avoid due to
Supersaturation and separate out crystal, so as to reduce the risk of two effect evaporation element foulings；In plant maintenance, the later stage is only needed to flash vessel
Cleaning, maintenance cost can be reduced and extend the service life of high-polymer membrane；A centrifugation is provided with flash vessel liquid outlet
Machine, it can be achieved to expel the pressure type for crystallizing salinity and moisture 100% reclaim.
(5) present invention uses plate evaporation unit (tradition is tubular type) and overflow-type liquid distributor in one, two effect MVR devices
Equipment Allocation Mode, load fountain liquid distributor and caused additional energy (1kW/m3) if can save, while pipe can be avoided
Drop hits tube wall and destroyed to caused by liquid film in shell-type evaporator, and solution film forming rate is high in evaporation element.
(6) present invention uses the removable diaphragm group of plug-in type in one, two effect MVR devices, need to only be directed to the diaphragm of damage
Group is changed, and can reduce later maintenance expense, and the layout type of plug-in type is advantageous to the replacing and maintenance in later stage.
(7) present invention replaces traditional compressor in one, two effect MVR devices using axial flow blower, helps to reduce energy consumption, and
Reducing shower water reduces the implementation link of steam superheat, so as to simplify the complexity of equipment and reduce cost.
(8) present invention is provided with condensed water pumpback magnetic valve between fluid reservoir and an effect MVR device circulation lines, can follow
When ring concentrate concentration is higher, to an effect evaporation element supplement condensed water, eliminate because concentration rise causes boiling point elevation
(BPE) the excessive risk of value.
(9) sodium-chloride water solution is concentrated using system and method for the present invention, energy consumption is low (to be filled compared with conventional metals MVR
Put (30kWh/m3) save more than 70%).
Brief description of the drawings
Fig. 1 is economic benefits and social benefits MVR system flow schematic diagrames of the present invention.
Fig. 2 is evaporator as a whole topology layout figure.
Fig. 3 is the diaphragm group schematic layout pattern in plug-in type detachable panel evaporator.
Fig. 4 is overflow-type liquid distributor fundamental diagram.
Fig. 5 is the layout (part) of overflow-type liquid distributor and polymer film at the top of evaporator.
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 relation of solutes content (by taking NaCl as an example) in solution in the total heat exchange area of system and an effect evaporation element
Figure.
Fig. 8 is system unit processing energy consumption, the graph of a relation of the total heat exchange area of system and polymer film both sides heat transfer temperature difference.
Each mark is as follows in Fig. 1：
1 raw material liquid storage tank, 2-1 raw materials pump, 2-2 mono- imitate circulating pump, 2-3 effect between booster pump, 2-4 bis- imitate circulating pump,
3 preheaters, 4-1 mono- imitate 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- imitate evaporation element, 5-4 mono- imitates centrifugal fan, 6-1 bis- imitates condensing unit, 6-2 bis- imitates hydrophobic polymer
Film, 6-3 bis- imitate evaporation element, 6-4 bis- imitates centrifugal fan, 6-5 flash vessels, 7-1 centrifuges, 7-2 concentrates reclaim
Tank, 8-1 fluid reservoirs, 8-2 vavuum pumps, 8-3 condensed water pumpbacks magnetic valve, 9 condensing hot air furnace tanks.
Embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
Material used, reagent etc., unless otherwise specified, are commercially obtained in following embodiments.
With reference to Figure of description, the present invention will be further described, but the invention is not limited in following examples.
Embodiment 1, board-like polymer economic benefits and social benefits MVR systems
As shown in figure 1, economic benefits and social benefits MVR systems of the present invention, it include raw material fluid reservoir (1), supercharging device, preheater (3), can
Adjustable type one imitates flow mixing device (three way flow control valve) (4-1), an effect MVR devices, two effect flow mixing devices (4-2), two effect MVR dresses
Put, concentrate recycling can (7-2) and condensate water recovery device；Supercharging device include raw material pump (2-1), one effect circulating pump (2-2),
Booster pump (2-3) and two effect circulating pumps (2-4) between effect；Preheater is provided with charging aperture, discharging opening, condensation water inlet and condensed water
Outlet；One effect MVR devices include an effect MVR evaporators and centrifugal fan (5-4)；One effect MVR evaporators are a reactor, quilt
Plug-in type detachable panel evaporator is separated into an effect evaporation element (5-3) and an effect condensing unit (5-1), in plate type heat exchanger
Plate be hydrophobic polymer film (5-2)；The top of plug-in type detachable panel evaporator is provided with an effect overflow-type liquid distributor,
As shown in Fig. 2 evaporator as a whole topology layout figures；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 one on one effect evaporation element (5-3)
The steam inlet of effect condensing unit (5-1) is connected by the pipeline provided with centrifugal fan (5-4)；Two effect MVR devices include
Two effect MVR evaporators, centrifugal fan (6-4) and flash vessel (6-5)；Two effect MVR evaporators are a reactor, can by plug-in type
Dismounting plate-type evaporator is separated into two effect evaporation elements (6-3) and two and imitates condensing units (6-1), and the plate in plate-type evaporator is
Hydrophobic polymer film (6-2), the top of plug-in type detachable panel evaporator is provided with an effect overflow-type liquid distributor, as Fig. 2 steams
Shown in Fa Qi integral structure layouts figure；Two effect evaporation elements (6-3) are provided with charging aperture and discharging opening；Two effect condensing unit (6-
1) steam inlet and condensation-water drain are provided with；The steam (vapor) outlet of two effect evaporation elements (6-3) and two imitates condensing units (6-1)
Steam inlet is connected by the pipeline provided with centrifugal fan (6-4)；(6-5) is provided with charging aperture, steam (vapor) outlet on flash vessel
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 raw material pump (2-1) with the charging aperture of preheater (3), the discharging of preheater (3)
Mouth is connected with an effect flow mixing device (4-1)；One effect flow mixing device (4-1) passes through the pipeline provided with an effect circulating pump (2-2) and an effect
The charging aperture of evaporation element (5-3) is connected, and the discharging opening of an effect evaporation element (5-3) is connected with an effect flow mixing device (4-1)
It is logical；One effect flow mixing device (4-1) is connected with two effect flow mixing devices (4-2) by the pipeline of booster pump (2-3) between setting effectively；Two effects are mixed
Stream device (4-2) is connected by the pipeline provided with two effect circulating pumps (2-4) with the charging aperture of two effect evaporation elements (6-3), 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) and from
Core type blower fan (6-4) is connected, and the discharging opening of flash vessel (6-5) is connected with centrifuge (7-1), and centrifuge (7-1) is divided into 2
Branch road, 1 branch road are connected with two effect flow mixing devices (4-2), and another 1 branch road is connected with concentrate recycling can (7-2)；One effect
The condensation-water drain of the condensation-water drain of condensing unit (5-1) and two effect condensing units (6-1) is connected with fluid reservoir (8-1)
It is logical；The outlet of fluid reservoir (8-1) is divided into 3 branch roads, and the 1st branch road is connected with the condensation water inlet of preheater (3), preheater
(3) condensation-water drain is connected with condensing hot air furnace tank (9), and the 2nd branch road is connected with a vavuum pump (8-2), the 3rd branch
Road is connected by the pipeline provided with condensed water pumpback magnetic valve with the charging aperture of an effect evaporation element (5-3).
In above-mentioned 1st effective evaporator and 2nd effect evaporator, structural representation such as Fig. 3 of plug-in type detachable panel evaporator
Shown, it is made up of 10 diaphragm groups, and each diaphragm group can be dismantled individually, and the specification of each diaphragm group is：Long 700mm, width
300mm, high 1400mm, each diaphragm group are formed by stacking that (this example uses modified polyetheretherketonefiber film, that is, changes by 80 polymer films
Property PEEK films, are made, the film component contains 50% polyureas by method of electrostatic spinning), the parameter of the polymer film is as follows：Thermal conductivity
For 0.25W/ (mK), water absorption rate 0.21%, CET (20 DEG C) be 44.1 μm/(m DEG C), CET (20 DEG C) be 39.2 μm/
(m DEG C), fusing point are 358 DEG C, glass transition temperature is 143 DEG C, specific heat is 2J/g DEG C, contact angle is 145.7 °.Molten
Liquid load is under 0.145kg/ (ms) experiment condition, and when solution film forming rate is 0.47 ± 0.03, average overall heat-transfer coefficient can
Up to 1570 ± 181W/ (m2·K)；When solution film forming rate is 1, the average overall heat-transfer coefficient of theory is up to 3375W/ (m2·K).Meanwhile
In cutting in connecting cover plate at the top of diaphragm, ensure that during spray feed liquid can uniform flow, every diaphragm both sides are by ring
Oxygen tree fat seals, and ensure that the sealing effectiveness and isolation effect of an effect evaporation element and an effect condensing unit.At elementary membrane
Manage feed liquid 0.26m3/(m2D) calculate, single diaphragm group can handle 20.4m daily3Feed liquid.
The dismantled and assembled diaphragm group number of plug-in type in an effect MVR devices in the present embodiment is 10, but in actual device
During production, it can need to be changed according to feed liquid treating capacity, meanwhile, the size of single diaphragm group and the size of every diaphragm
It is changed, it all should cover among scope of the presently claimed invention.
In the present embodiment overflow-type liquid distributor fundamental diagram as shown in figure 4, evaporator at the top of overflow-type liquid distributor with
The layout of hydrophobic polymer film is as shown in Figure 5.Plate evaporation unit and overflow-type liquid distributor it can be seen from Fig. 4 and Fig. 5
Be equipped with, avoid damage of the conventional tubular evaporation element to liquid film, while save and extra fountain liquid distributor is set
Caused energy consumption.
An adjustable effect flow mixing device (three way flow control valve) is concretely entitled used by the present embodiment
" three way flow control valve ", the three way flow control valve disclosed in Application No. 01109412.5, its structure are as follows：The control valve
Include the hollow cylindrical shell of a both ends open.One first and second be respectively supported in the end of housing first and second
Valve chamber, the first valve chamber have first refrigerant discharge hole and first aperture, and the second valve chamber has one second refrigeration
Agent discharge orifice and a refrigerant access aperture, and second aperture therebetween.First and second valvings distinguish axle
To be movably disposed in two valve chambers with control the first and second apertures opening ratios.Actuation means are arranged on two valves
It is used to control two valvings between room and two valve chambers is interconnected.Can be to entering described one by the three-way control valve
The ratio of the feed liquid of effect evaporation element and the two effects evaporation element is controlled, so as to adjust one, two effect solution treating capacities.
When in use, technological process is as follows for above-mentioned MVR devices：
Material liquid in raw material liquid storage pump (1) enters in preheater (3) in the presence of raw material pump (2), the temperature of material liquid
Degree rise.Feed liquid after heating enters an effect evaporation element by an effect circulating pump (2-2), passes through the polymer of evaporator surface
Film (5-2) is exchanged heat with the steam in an effect condensing unit (5-1), and feed liquid absorbs evaporation after heat is warming up to boiling point and forms steaming
Vapour, condensation heat release in an effect condensing unit (5-1) is delivered to after centrifugal fan (5-4) boosting.In one effect evaporation element (5-3)
Concentrate through one effect flow mixing device (4-1) shunting, after being mixed mostly as circulation fluid with material liquid, into one imitate evaporation element
Sprayed in (5-3), fraction enters in two effect evaporation elements (6-3) by booster pump (2-3) between effect passes through evaporator table
The polymer film (6-2) in face is exchanged heat with the steam in two effect condensing units (6-1), and feed liquid is in two effect evaporation elements (6-3)
Middle heat absorption is warming up to close to boiling point, and into flash vessel (6-5) part flash-off of steam, steam boosts through centrifugal fan (6-4)
After deliver to condensation heat release in two effect condensing units (6-1).After steam condensation generation condensed water in one or two effect condensing units, enter
Fixed gas is removed in fluid reservoir (8-1), after heat is reclaimed by preheater (3), into condensing hot air furnace tank (9).Flash vessel
Unevaporated feed liquid is defeated through two effect flow mixing devices (4-2) and an effect flow mixing device after centrifuge (7-1) removes crystal in (6-5)
Two effect evaporation elements (6-3), which are gone successively to, after the feed liquid mixing sent participates in evaporation.
The control of embodiment 2, feed liquid total dissolved solidss content
When being concentrated using the economic benefits and social benefits MVR systems in embodiment 1 to feed liquid, the BPE values of feed liquid are that boiling point elevation value exists
In the range of 0-2.1 DEG C.Rise law (inference of Raoult's law, calculating formula according to solution boiling point
Wherein, Δ T is boiling point liter, K；R is gas constant, and for vapor, R is 0.462kJ/ (kgK)；T0To be pure molten
The boiling temperature of agent, K；γ0It is neat solvent in T0When molal latent heat of vaporization, kJ/kg；For solute in weak solution
Molar fraction increment.
Because what is calculated is boiling point liter relative to pure solution herein, therefore it can regard as and be added to the neat solvent that concentration is 0
The molar fraction increment of solute, i.e. soluteWith the molar fraction (x of solute2) in the same size.),
The initial calculation condition set by the present invention, T0For 328K (55 DEG C), γ0For 2595.84kJ/kg, quality in solution
Concentration is the molar concentration x of 13.89% sodium chloride2For 0.047, it can be calculated, the sodium chloride solution in an effect evaporation element
Mean boiling point rise be no more than 0.95 DEG C, two effect evaporation elements in sodium chloride solution mean boiling points rise be no more than 1.15 DEG C,
Therefore think the i.e. boiling point elevation value of BPE values of feed liquid in the range of 0-2.1 DEG C.
Therefore, the model in 0-3.5% need to be controlled into total dissolved solidss content (TDS) value in feed liquid in 1st effective evaporator
In enclosing.
It can be realized by the following method during specific implementation：
By one effect flow mixing device control to adjust one, two effect feed liquids allocation proportions, if while TDS instrument detect in system
Feed liquid TDS values are too high, and condensed water pumpback magnetic valve (8-3) can be controlled by output signal to the circulation pipe in an effect MVR devices
Road carries out moisturizing, so as to complete dilution before feed liquid enters an effect evaporation element (5-3).
Embodiment 3, one imitates the relation of circulation pump power and solution temperature rise size in an effect evaporation element
Illustrated so that Solute mass fraction is 5% NaCl solution as an example, as shown in fig. 6, effect circulating pump (2-2) work(
Consumption reduces with the raising of effect evaporation element (5-3) interior solution temperature rise, and reason is that temperature rise is higher, required circulation solution
Amount is fewer；Meanwhile during 1.5-2.5 DEG C of temperature rise, pump work declines more obvious, therefore more suitable limit of temperature rise should be 2.5-
5.5℃；From Fig. 3 it can also be seen that in effect evaporation element (5-3) solution the evaporating temperature (evaporating temperature of three curves in figure
Respectively 50 DEG C, 60 DEG C and 70 DEG C) pump work is had no significant effect.
The relation of solutes content in the total heat exchange area of embodiment 4, system and an effect evaporation element
Illustrated so that Solute mass fraction is 5% NaCl solution as an example, as shown in fig. 7, comprises an effect evaporation element
The total heat exchange area of system including (5-3), two effect evaporation elements (6-3) and preheater (3), with an effect evaporation element (5-3)
The increase of the NaCl meltages of concentrate and reduce, that is, the cycles of concentration for improving solute in effect evaporation element (5-3) is advantageous to
Heat exchange area is reduced, this is mainly due to an effect MVR device solution treating capacity far above two effect MVR devices；Meanwhile improve an effect
The evaporating temperature of solution can reduce the total heat exchange area of system in evaporation element (5-3), help to reduce using and dropping for material
Low cost, but add the risk of polymer surfaces fouling.
Pass between embodiment 5, system unit processing energy consumption, the total heat exchange area of system and polymer film both sides heat transfer temperature difference
System
Illustrated so that Solute mass fraction is 5% NaCl solution as an example, as shown in figure 8, with polymer film both sides
The reduction of heat transfer temperature difference, the energy consumption of system unit processing area reduces, but total heat exchange area of system raises, and therefore, reduces
The heat transfer temperature difference of polymer film both sides contributes to the reduction of system unit processing energy consumption, but can increase to the total heat exchange area of system
Demand, balance how is found between operating cost and a construction cost, it is more crucial in system design process.
Embodiment 6, on reduce energy consumption
This example is to handle air quantity (22454m3/ h) and blast (1800Pa) exemplified by illustrate, blower fan from Zibo pass
The 4-72-8D-1450 type blower fans of beneficial ventilation equipment Co., Ltd, parameter are as shown in table 2.
Centrifugal blower (4-72-8D-1450 types) parameter that table 2, suggestion are used instead
Known by table 2, maximum fan shaft power is 18.5kW, and stoste amount treating capacity is 2.41m3/ h, then unit volume raw material
Liquid processing energy consumption is up to 7.68kWh/m3, and the unit for other energy consumption equipments (feed pump, vavuum pump, circulating pump) selected
Volume material liquid processing energy consumption sum is no more than 1kWh/m3, i.e., MVR systems it is total unit volume material liquid processing energy consumption do not surpass
Cross 8.68kWh/m3, compared with conventional metals MVR devices (30kWh/m3) save more than 70%.
Embodiment 7, using economic benefits and social benefits MVR systems of the present invention 5% sodium chloride (NaCl) feed liquid is concentrated
Knot is evaporated to ammonium chloride (NaCl) solution that mass concentration is 5% using the economic benefits and social benefits MVR systems in embodiment 1
Crystalline substance, process regulation are as follows：
1) it is 3 to control to adjust one, two allocation proportions for imitating feed liquids using an effect flow mixing device：1, if while TDS instrument detection
It is too high to go out feed liquid TDS values in system, condensed water pumpback magnetic valve (8-3) can be controlled by output signal in an effect MVR devices
Circulation line carry out moisturizing, so as to which 5% sodium chloride is diluted in into 3.5% before feed liquid enters effect evaporation element (5-3)
Below.
2) evaporating temperature of the sodium chloride feed liquid in an effect evaporation element is 55 DEG C, model of the temperature rise control at 2.5-5.5 DEG C
In enclosing.
3) heat transfer temperature difference of polymer film both sides is 0~0.95 DEG C, and the total heat exchange area of system is 784m2。
4) the 4-72-8D-1450 type blower fans of Zibo Chuan Yi ventilation equipment Co., Ltd are selected as compressor.
In the present embodiment, under above-mentioned process conditions, 1m is handled3Brackish water needs to consume 8.68 degree of electric energy, produces simultaneously
Condensed water 0.93t.In the present embodiment, after brine strength is concentrated into 64%, separates and separate out through centrifuge, in caused condensed water
Contained salinity is no more than 0.05wt%.
Above example only not limits technical scheme described in the invention to illustrate the present invention；Therefore, although
This specification is with reference to the above embodiments to present invention has been detailed description, but one of ordinary skill in the art should
Work as understanding, still technical scheme can be modified or equivalent substitution, without departing from technical solution of the present invention
Objective and scope, it all should cover among scope of the presently claimed invention.
Claims (6)
1. a kind of economic benefits and social benefits function of mechanical steam recompression system, it include raw material fluid reservoir, supercharging device, preheater, an effect flow mixing device,
One effect MVR devices, two effect flow mixing devices, two effect MVR devices, concentrate recycling can and condensate water recovery device；
The supercharging device includes booster pump and two effect circulating pumps between raw material pump, an effect circulating pump, effect；
The one effect MVR devices include an effect MVR evaporators and compressor；The one effect MVR evaporators are a reactor, by plate
Formula evaporator is separated into an effect evaporation element and an effect condensing unit, and the plate in the plate-type evaporator is hydrophobic polymer
Film；Steam (vapor) outlet on the one effect evaporation element is entered by the steam of the pipeline provided with compressor and described one effect condensing unit
Mouth is connected；
The two effect MVR devices include two effect MVR evaporators and compressor；The two effects MVR evaporators are a reactor, by plate
Formula evaporator is separated into two effect evaporation elements and two effect condensing units, and the plate in the plate-type evaporator is hydrophobic polymer
Film；Steam (vapor) outlet on the two effects evaporation element is entered by the steam of the pipeline provided with compressor and described two effect condensing units
Mouth is connected；
In the one effect MVR devices and the two effects MVR devices, the thickness of the hydrophobic polymer film is 15~60 μm；Institute
The contact angle for stating hydrophobic polymer film is 110 °~150 °, and water absorption rate is 0.0042%~0.41%, 20 DEG C of thermal coefficient of expansions
For 44.1~100 μm/(m DEG C), 100 DEG C of thermal coefficient of expansions are 39.2~140 μm/(m DEG C), and fusing point is 330~340 DEG C,
Glass transition temperature is 140~220 DEG C, and thermal conductivity factor is 0.2~0.35W/ (mK)；
In the one effect MVR devices and the two effects MVR devices, the hydrophobic polymer film is polycarbonate membrane, polyethers ether
Ketone film, PPSU film, PS membrane or poly tetrafluoroethylene；
The condensate water recovery device includes fluid reservoir and condensing hot air furnace tank；
The raw material fluid reservoir is connected by the pipeline provided with the raw material pump with the charging aperture of the preheater；The preheating
The discharging opening of device is connected with described one effect flow mixing device；It is described one effect flow mixing device by provided with described one effect circulating pump pipeline with
The charging aperture of the one effect evaporation element is connected, and the discharging opening of the effect evaporation element is connected with described one effect flow mixing device
It is logical；The one effect flow mixing device provided with the pipeline of booster pump between the effect with described two effect flow mixing devices by being connected；Two effect
Flow mixing device is connected by the pipeline provided with described two effect circulating pumps with the charging aperture of described two effect evaporation elements, and two effect
The discharging opening of evaporation element is divided into 2 branch roads, and 1 branch road is connected with described two effect flow mixing devices, another 1 branch road and the concentration
Liquid recycling can is connected；
It is described one effect condensing unit condensation-water drain and it is described two effect condensing unit condensation-water drain with the fluid reservoir
It is connected；The fluid reservoir is connected with the condensing hot air furnace tank；
The one effect flow mixing device is that adjustable type one imitates flow mixing device, to entering described one effect evaporation element and the two effects evaporation element
The ratio of feed liquid be controlled；
The two effects MVR devices also include flash vessel and centrifuge；It is described two effect evaporation element steam (vapor) outlet and discharging opening be
Same outlet, the charging aperture of the flash vessel are connected with the outlet；The steam (vapor) outlet of the flash vessel and the compressor phase
Connection；The discharging opening of described flash vessel is connected with the centrifuge；The outlet of the centrifuge is divided into 2 branch roads, wherein 1
Individual branch road is connected with described two effect flow mixing devices, and 1 branch road is connected with the concentrate recycling can in addition.
2. vapor recompression system according to claim 1, it is characterised in that：The one effect MVR devices and two effect
In MVR devices, the plate-type evaporator is plug-in type detachable panel evaporator；The plate-type evaporator can be single by 1~10
The diaphragm group solely dismounted is formed；Each the specification of the diaphragm group is：Long 500~1500mm, wide 200~600mm, high by 1000~
3000mm；Each diaphragm group is formed by stacking by 50~100 hydrophobic polymer film diaphragms；
Liquid distributor is additionally provided with above the plate-type evaporator, the liquid distributor is overflow-type liquid distributor.
3. vapor recompression system according to claim 1 or 2, it is characterised in that：The fluid reservoir is also by provided with cold
The pipeline of condensate pumpback magnetic valve connects with the charging aperture of described one effect evaporation element；
In the one effect MVR devices and the two effects MVR devices, the compressor is centrifugal fan.
4. a kind of method that any vapor recompression system is concentrated to inorganic salts waste water in 1-3 using claim,
Comprise the following steps：
(1) the waste water material liquid being stored in raw material liquid storage tank is delivered in preheater in the presence of raw material pump；By pre-
The feed liquid of heat enters an effect mixed flow device, and an effect evaporation element is entered in the presence of an effect circulating pump and is evaporated；Evaporate
Enter an effect condensing unit after the raise steam arrived；In the evaporation process, it is described one effect evaporation element in feed liquid with it is described
Steam in one effect condensing unit is exchanged heat by the hydrophobic polymer film in plate-type evaporator；
(2) described one effect evaporation element be concentrated by evaporation after feed liquid by one effect flow mixing device, be divided into 2 strands, be designated as respectively A-share and
B stocks；A-share feed liquid is back in an effect evaporation element in the presence of an effect circulating pump and participation evaporation, B stock materials is mixed with material liquid
Liquid sequentially enters two effect evaporation elements after imitating flow mixing devices by booster pump between effect and two and flash vessel is evaporated；What evaporation obtained
Enter two effect condensing units after raise steam；In the evaporation process, feed liquid and described two effects in the two effects evaporation element
Steam in condensing unit is exchanged heat by the hydrophobic polymer film in plate-type evaporator；The obtained condensed water that exchanges heat passes through liquid storage
Tank is recovered in condensing hot air furnace tank；
(3) feed liquid after described two effect evaporation elements are concentrated by evaporation is divided into 2 strands, is designated as C stocks and D stocks respectively by centrifuge；
C stock materials liquid is back in two effect evaporation elements in the presence of two effect circulating pumps and mixed with the feed liquid flowed out out of an effect evaporation element
Close and participate in evaporation, D stock material liquid is concentrated the recovery of liquid recycling can；The obtained condensed water that exchanges heat is recovered to condensed water by fluid reservoir
In recycling can.
5. according to the method for claim 4, it is characterised in that：Condensed water in the fluid reservoir as described in solenoid valve control enters
In the circulation line of the one effect evaporation element so that be into the total dissolved solidss content value of feed liquid in an effect evaporation element
0~3.5%, but be not 0；The one effect flow mixing device is that adjustable type one imitates flow mixing device, control A-share and the volume ratio of B stocks be (1~
5)：1.
6. the method according to claim 4 or 5, it is characterised in that：Control the evaporating temperature in the effect evaporation element
For 54~57 DEG C；In the 1st effective evaporator, the heat transfer temperature difference of the hydrophobic polymer film both sides is 1.1~3.1 DEG C；It is described
Total heat exchange area of economic benefits and social benefits function of mechanical steam recompression system is 190~250m2。
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|---|---|---|---|---|
| CN102989181A (en) * | 2012-12-17 | 2013-03-27 | 李锦龙 | Compound type monomer multi-effect steam mechanical recompression evaporator |
| CN103446776A (en) * | 2013-07-24 | 2013-12-18 | 深圳市捷晶能源科技有限公司 | Sodium bichromate concentration and crystallization equipment and technology |
| CN104027993A (en) * | 2014-07-03 | 2014-09-10 | 北京欧泰克能源环保工程技术股份有限公司 | Mechanical steam recompressing evaporation system and energy saving method |
| JP2014188399A (en) * | 2013-03-26 | 2014-10-06 | Ihi Corp | Seawater desalination system and method |
| CN205381975U (en) * | 2015-11-26 | 2016-07-13 | 清华大学 | Board -like hydrophobic polymer economic benefits and social benefits MVR system |
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Patent Citations (5)
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|---|---|---|---|---|
| CN102989181A (en) * | 2012-12-17 | 2013-03-27 | 李锦龙 | Compound type monomer multi-effect steam mechanical recompression evaporator |
| JP2014188399A (en) * | 2013-03-26 | 2014-10-06 | Ihi Corp | Seawater desalination system and method |
| CN103446776A (en) * | 2013-07-24 | 2013-12-18 | 深圳市捷晶能源科技有限公司 | Sodium bichromate concentration and crystallization equipment and technology |
| CN104027993A (en) * | 2014-07-03 | 2014-09-10 | 北京欧泰克能源环保工程技术股份有限公司 | Mechanical steam recompressing evaporation system and energy saving method |
| CN205381975U (en) * | 2015-11-26 | 2016-07-13 | 清华大学 | Board -like hydrophobic polymer economic benefits and social benefits MVR system |
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