CN105536277B - A kind of evaporating and concentrating process and device of the cellulose solvent NMMO aqueous solution - Google Patents
A kind of evaporating and concentrating process and device of the cellulose solvent NMMO aqueous solution Download PDFInfo
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- CN105536277B CN105536277B CN201610143820.5A CN201610143820A CN105536277B CN 105536277 B CN105536277 B CN 105536277B CN 201610143820 A CN201610143820 A CN 201610143820A CN 105536277 B CN105536277 B CN 105536277B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
- C07D295/22—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with hetero atoms directly attached to ring nitrogen atoms
- C07D295/24—Oxygen atoms
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The invention discloses a kind of evaporation concentration device of the cellulose solvent NMMO aqueous solution, its process characteristic is " series connection preheating, an effect charging, following current evaporation, dense effect connection heat ".Including 1st effective evaporator, 2nd effect evaporator, triple effect evaporator, four-effect evaporator, quintuple effect evaporator and one-level preheater, two level preheater, three-level preheater, level Four preheater, Pyatyi preheater that preheating of connecting only is fed for 1st effective evaporator.The invention also discloses a kind of using a kind of evaporating and concentrating process of the cellulose solvent NMMO aqueous solution of the evaporation concentration device of the cellulose solvent NMMO aqueous solution.The present invention can obtain the NMMO aqueous solution that concentration is 65%, steam-water ratio 0.215, and the NMMO aqueous solution that concentration is 85%, steam-water ratio 0.225, all lead over world level 0.23.
Description
Technical field
The invention belongs to the evaporation technology of the recycling design in solvent method experimental branch line and device field, specifically one
The evaporating and concentrating process and device of the kind cellulose solvent NMMO aqueous solution.
Background technology
Solvent method produces chemical fibre, is a kind of manufacturing technique method of Fresh fats, solvent for use is N-methylmorpholine-N-
The aqueous solution of oxide (NMMO).Concentration of this solution after separated and dissolved fiber is 15~20%, the reuse after concentration
Concentration requirement is 85% or 65%.The characteristics of NMMO aqueous solution be " boiling point liter " height, and high temperature, it is highly concentrated under, it may occur that decompose,
The country is still without first and then applicable vaporising device.There are Patent No. 200610027723.6, entitled " NMMO evaporation side
Method ", there is provided be the production of 2 single-effect vacuum evaporator combinations method, be still very backward production method.Certain domestic research
The method that institute proposed triple effect evaporation NMMO solution, but its energy consumption and the advanced need that can not meet modernization industry production completely
Will.It is said that the external device for having 6 effects evaporation NMMO, steam-water ratio can reach 0.23, but its technology is top-secret.Therefore, it is necessary to
Invent a kind of evaporation and concentration work for the cellulose solvent NMMO aqueous solution for saving, efficiently meeting modernization industry production needs
Skill and device.
The content of the invention
Higher boiling, labile feature are had according to the high concentration NMMO aqueous solution, and a kind of cellulose solvent NMMO is provided
The evaporating and concentrating process and device of the aqueous solution.The elevations of boiling point of NMMO at different concentrations and temperatures are known by experiment to advise
Rule：Under vacuum during concentration 91%, the elevation of boiling point is 54 degree, and during concentration 82.73%, the elevation of boiling point is 45 degree, concentration 65.94% it
When, the elevation of boiling point is 34 degree.During concentration 54.82%, the elevation of boiling point is 22 degree.Under normal pressure, when concentration is 25.27%, boiling point liter
A height of 5 degree, when concentration is 22.39%, the elevation of boiling point is only 3 degree；
The present invention utilizes elevation of boiling point rule of the NMMO solution under different temperatures, various concentrations, designs and " connects pre-
The process of heat, an effect charging, following current evaporation, dense effect connection ", makes whole materials all enter an effect after preheating, successively
Into two effects until n effect evaporations, concentration gradually rise, make feed liquid in preceding triple effect evaporation, the state risen all in low boiling,
Due to the elevation of boiling point, caused heat transfer temperature loss minimizes.So as to so that the evaporation effect number of the NMMO aqueous solution brings up to 4
Effect, five effects, six effects.6th effect of sextuple-effect evaporation low-temperature cooling water (being less than 20 DEG C) condensation indirect steam.For more highly concentrated
The NMMO aqueous solution of degree, boiling point are upgraded to 48 DEG C, design and are evaporated in dense effect, dense effect of the invention, are also not steamed using boiler
Vapour, but imitated from n-2 above (when n be three~six) or n-3 imitates a part of indirect steam of evaporator extraction (when n is four~six)
As thermal source.
The technological means that the present invention uses is as follows：
A kind of evaporation concentration device of the cellulose solvent NMMO aqueous solution, including be sequentially connected with 1st effective evaporator, two effect
Evaporator connects the one-level preheater preheated, two level preheater until n until n effect evaporators and only for 1st effective evaporator charging
Level preheater；Also include an effect circulating pump, two effects being connected respectively with 1st effective evaporator, 2nd effect evaporator until n effect evaporators
Circulating pump imitates circulating pump until n, wherein, one in n tri-, four, five, six,
Under working condition, the NMMO aqueous solution of pending low temperature, successively by n levels preheater, n-1 levels preheater until
After one-level preheater series connection pre-heating temperature elevation, evaporated into 1st effective evaporator, sequentially enter 2nd effect evaporator afterwards until n effect evaporations
Device evaporates, the NMMO aqueous solution after n effect evaporator discharge concentrations；Indirect steam caused by upper 1st effective evaporator enters next effect
The heater of evaporator, indirect steam caused by n effect evaporators enter condensing unit；The heating steam condensate (SC) of 1st effective evaporator
Into one-level preheater, the condensed water of one-level preheater discharge heats steam condensate (SC) together with 2nd effect evaporator and preheated into two level
Device, until the condensed water of n-1 levels preheater discharge enters n level preheaters together with the condensed water of n effect evaporator heating steam；N levels
The low temperature cold condensate discharge of preheater discharge is used for other purposes.
A kind of evaporation concentration device of cellulose solvent NMMO aqueous solution also includes being used for what n effect evaporators were connected
Evaporation and concentration obtains the concentrated evaporator of the high concentration NMMO aqueous solution, and concentrated evaporator is provided with dense effect circulating pump,
Under working condition, when n is four~six, imitates and steam through overrich from the NMMO aqueous solution after n effect evaporator discharge concentrations
Hair device obtains the high concentration NMMO aqueous solution, and the indirect steam for drawing a part of n-2 effects or n-3 effect evaporators evaporates into dense effect
Device, concentrated evaporator heating steam condensate (SC) enter n-1 level preheaters；When n is three, after triple effect evaporator discharge concentration
The NMMO aqueous solution obtains the high concentration NMMO aqueous solution by concentrated evaporator, and the indirect steam for drawing a part of 1st effective evaporator enters
Enter concentrated evaporator, concentrated evaporator heating steam condensate (SC) enters two level preheater.
The liquid barrier for being used for stopping high material casting liquid is provided with the steam chamber of each effect evaporator and concentrated evaporator and is used for
The silk screen efficiently separated to the mist in indirect steam；Each effect circulating pump and dense effect circulating pump are electromagnetic drive without sealing
Circulating pump or No leakage circulating pump, to reduce the loss of the NMMO aqueous solution to greatest extent.
The structure design of each effect evaporator and concentrated evaporator is cocurrent falling film evaporator or reverse-flow falling film evaporator, from
And heat transfer efficiency is improved, the liquid holdup of evaporator is reduced, shortens residence time of the solvent in evaporator, mitigates pyrolytic.
Preheaters at different levels are the plate type heat exchanger of full welded type.
The invention also discloses a kind of using a kind of cellulose of the evaporation concentration device of the cellulose solvent NMMO aqueous solution
The evaporating and concentrating process of the solvent NMMO aqueous solution, there is following processing step：
S1, series connection preheating：The NMMO aqueous solution of pending low temperature successively by n levels preheater, n-1 levels preheater until
Reach the high temperature close to boiling point after one-level preheater series connection pre-heating temperature elevation, wherein, one in n tri-, four, five, six；
S2, an effect charging：It will reach after preheating and fed close to the NMMO aqueous solution of the high temperature of boiling point from 1st effective evaporator；
S3, following current evaporation：Feed liquid is discharged into 2nd effect evaporator evaporation from an effect after 1st effective evaporator evaporates, until
Into n effect evaporator discharge feed liquids, the NMMO aqueous solution after being concentrated,
The discharge overfall respectively imitated is arranged at liquid level, is higher by the feed liquid of liquid level and overflow, passes through U-tube and aftereffect
Charging aperture connects, and balances the pressure difference between each effect evaporator with U-tube, and the liquid level of each effect is kept constant；
S4, dense effect connection heat：When n is four~six, imitates and steam through overrich from the NMMO aqueous solution after n effect evaporator discharge concentrations
Hair device obtains the high concentration NMMO aqueous solution, and concentrated evaporator draws a part of secondary steaming from n-2 effects above or n-3 effect evaporators
Vapour realizes the combined heat with preceding n effect vaporising devices, it is pre- that concentrated evaporator heating steam condensate (SC) enters n-1 levels as thermal source
Hot device；When n is three, high concentration NMMO is obtained by concentrated evaporator from the NMMO aqueous solution after triple effect evaporator discharge concentration
The aqueous solution, concentrated evaporator draw a part of indirect steam as thermal source from 1st effective evaporator above, realize and steamed with preceding triple effect
The combined heat of transmitting apparatus, concentrated evaporator heating steam condensate (SC) enter n-1 level preheaters.
It is 0.0024~0.006MPa that n, which imitates evaporator and the absolute pressure pressure of concentrated evaporator,.
Indirect steam caused by upper 1st effective evaporator enters the heater of lower 1st effective evaporator, and n is imitated two caused by evaporator
Secondary steam enters cooling device；The heating steam condensate (SC) of 1st effective evaporator enters one-level preheater, the discharge of one-level preheater
Condensed water enters two level preheater together with 2nd effect evaporator heating steam condensate (SC), until the condensed water of n-1 levels preheater discharge
Enter n level preheaters together with the condensed water of n effect evaporator heating steam；The low temperature cold condensate discharge of n levels preheater discharge makees him
With.
When n is three~five, the concentration of the NMMO aqueous solution after the concentration is 65%, the concentrated evaporator discharge
The concentration of the high concentration NMMO aqueous solution is 85%.
When n is six, the indirect steam of last evaporator passes through the sub-cooled water condensation less than 20 DEG C；When n be three,
4th, during one in five, circulating water condensing that the indirect steam of last evaporator passes through air cooling tower.
The point of the key of the present invention is " series connection preheating ".Series connection preheating is that the waste heat of all effect condensed waters is all used
The preheating of Yu Yixiao chargings, makes an effect reach a high temperature charging, the height into an effect feed liquid can be converted into the low temperature of condensed water by realizing
Wen Neng.The heating heat in an effect is reduced, increases heat of evaporation, an effect indirect steam amount is improved to greatest extent, after improving
The evaporation capacity respectively imitated, the quantity of raw steam is saved, reduces steam-water ratio.
The thermal source of series connection preheating is the heating steam condensate (SC) of each effect, if necessary can also be with condensed water, into some
Indirect steam, further to improve the temperature of an effect charging.
The heating steam condensate (SC) of 1st effective evaporator enters one-level preheater, and the condensed water of one-level preheater discharge is together with two
Effect evaporator heating steam condensate (SC) enters two level preheater, until the condensed water of n-1 levels preheater discharge imitates evaporator together with n
The condensed water of heating steam enters n level preheaters；The low temperature cold condensate discharge of n levels preheater discharge is used for other purposes.
It is design " following current evaporation " that the point of the key of the present invention, which also resides in,.Following current refers to the flow direction and indirect steam of material
Flow direction is consistent：One effect discharge enters the evaporation of two effects, until entering n effect evaporator discharge feed liquids." series connection preheating " makes an effect obtain most
The preheating of high-temperature, " following current evaporation " make each effect since imitating two all be boiling-point feeding, and two imitate the liter of each effect started
Warm is all " zero ", in the past the heat of the indirect steam of effect input, is completely used for evaporating moisture.
The point of the key of the present invention is that, avoids material in evaporation process while high temperature, highly concentrated situation occurs.NMMO
Material can decompose under highly concentrated, high temperature.The technological process of the present invention, it is low concentration under high temperature, is high concentration under low temperature, this
The reaction it is avoided that material is decomposed.
The point of key of the present invention is that, with parallel type falling film evaporator, or reverse-flow falling film evaporator is as each effect
The main equipment of vaporising device and concentrated evaporator.Because cocurrent falling film evaporation or countercurrent falling-film evaporation, have very high heat transfer
Coefficient, while there is minimum liquid holdup.Minimum liquid of holding can reduce residence time of the material in evaporator, reduce chemistry point
Solution, production circulating fund is reduced, because the price of NMMO solution is very high, evaporator reduces and holds liquid, it is possible to reduces and takes stream
Dynamic fund.
The point of key of the invention is that, increases concentrated evaporator, and dense effect is evaporated to vacuum evaporation, it is necessary to is maintained at
It is evaporated under 0.0024~0.006MPa absolute pressures.Concentrated evaporator from above n-2 effect (when n be three~six) or n-3 effect (when
N is four~six) evaporator draws a part of indirect steam as thermal source.The NMMO that discharge high concentration can be concentrated by evaporation is water-soluble
Liquid.
Compared with prior art, the present invention can obtain concentration as the 65% NMMO aqueous solution, steam-water ratio 0.215, and
Concentration is the 85% NMMO aqueous solution, steam-water ratio 0.225, all leads over world level 0.23.
The present invention can be in the evaporating and concentrating process and device of the recycling design in solvent method experimental branch line for the foregoing reasons
Field is widely popularized.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is that a kind of evaporation concentration device of the cellulose solvent NMMO aqueous solution (steam by " five effects " in embodiments of the invention 1
Hair, cocurrent falling liquid film device) structural representation.
Fig. 2 is a kind of evaporation concentration device of the cellulose solvent NMMO aqueous solution (" five effect connection in embodiments of the invention 2
Connect dense effect " evaporation, cocurrent falling liquid film device) structural representation.
Fig. 3 is that a kind of evaporation concentration device of the cellulose solvent NMMO aqueous solution (steam by " five effects " in embodiments of the invention 3
Hair, countercurrent falling-film device) structural representation.
Wherein, A is steam, and B is the low temperature NMMO aqueous solution that concentration is 15%, and C is condensed water, and D is that concentration is 65%
The NMMO aqueous solution, E are the NMMO aqueous solution that concentration is 85%
Embodiment
A kind of evaporation concentration device of the cellulose solvent NMMO aqueous solution, including be sequentially connected with 1st effective evaporator, two effect
Evaporator connects the one-level preheater preheated, two level preheater until n until n effect evaporators and only for 1st effective evaporator charging
Level preheater；Also include an effect circulating pump, two effects being connected respectively with 1st effective evaporator, 2nd effect evaporator until n effect evaporators
Circulating pump imitates circulating pump until n, wherein, one in n tri-, four, five, six,
Under working condition, the NMMO aqueous solution of pending low temperature, successively by n levels preheater, n-1 levels preheater until
After one-level preheater series connection pre-heating temperature elevation, evaporated into 1st effective evaporator, sequentially enter 2nd effect evaporator afterwards until n effect evaporations
Device evaporates, the NMMO aqueous solution after n effect evaporator discharge concentrations；Indirect steam caused by upper 1st effective evaporator enters next effect
The heater of evaporator, indirect steam caused by n effect evaporators enter condensing unit；The heating steam condensate (SC) of 1st effective evaporator
Into one-level preheater, the condensed water of one-level preheater discharge heats steam condensate (SC) together with 2nd effect evaporator and preheated into two level
Device, until the condensed water of n-1 levels preheater discharge enters n level preheaters together with the condensed water of n effect evaporator heating steam；N levels
The low temperature cold condensate discharge of preheater discharge is used for other purposes.
A kind of evaporation concentration device of cellulose solvent NMMO aqueous solution also includes being used for what n effect evaporators were connected
Evaporation and concentration obtains the concentrated evaporator of the high concentration NMMO aqueous solution, and concentrated evaporator is provided with dense effect circulating pump,
Under working condition, when n is four~six, imitates and steam through overrich from the NMMO aqueous solution after n effect evaporator discharge concentrations
Hair device obtains the high concentration NMMO aqueous solution, and the indirect steam for drawing a part of n-2 effects or n-3 effect evaporators evaporates into dense effect
Device, concentrated evaporator heating steam condensate (SC) enter n-1 level preheaters；When n is three, after triple effect evaporator discharge concentration
The NMMO aqueous solution obtains the high concentration NMMO aqueous solution by concentrated evaporator, and the indirect steam for drawing a part of 1st effective evaporator enters
Enter concentrated evaporator, concentrated evaporator heating steam condensate (SC) enters two level preheater.
The liquid barrier for being used for stopping high material casting liquid is provided with the steam chamber of each effect evaporator and concentrated evaporator and is used for
The silk screen efficiently separated to the mist in indirect steam；Each effect circulating pump and dense effect circulating pump are electromagnetic drive without sealing
Circulating pump or No leakage circulating pump.
The structure design of each effect evaporator and concentrated evaporator is cocurrent falling film evaporator or reverse-flow falling film evaporator.
Preheaters at different levels are the plate type heat exchanger of full welded type.
It is a kind of using a kind of cellulose solvent NMMO aqueous solution of the evaporation concentration device of the cellulose solvent NMMO aqueous solution
Evaporating and concentrating process, it is characterised in that there is following processing step：
S1, series connection preheating：The NMMO aqueous solution of pending low temperature successively by n levels preheater, n-1 levels preheater until
Reach the high temperature close to boiling point after one-level preheater series connection pre-heating temperature elevation, wherein, one in n tri-, four, five, six；
S2, an effect charging：It will reach after preheating and fed close to the NMMO aqueous solution of the high temperature of boiling point from 1st effective evaporator；
S3, following current evaporation：Feed liquid is discharged into 2nd effect evaporator evaporation from an effect after 1st effective evaporator evaporates, until
Into n effect evaporator discharge feed liquids, the NMMO aqueous solution after being concentrated,
The discharge overfall respectively imitated is arranged at liquid level, is higher by the feed liquid of liquid level and overflow, passes through U-tube and aftereffect
Charging aperture connects, and balances the pressure difference between each effect evaporator with U-tube, and the liquid level of each effect is kept constant；
S4, dense effect connection heat：When n is four~six, imitates and steam through overrich from the NMMO aqueous solution after n effect evaporator discharge concentrations
Hair device obtains the high concentration NMMO aqueous solution, and concentrated evaporator draws a part of secondary steaming from n-2 effects above or n-3 effect evaporators
Vapour realizes the combined heat with preceding n effect vaporising devices, it is pre- that concentrated evaporator heating steam condensate (SC) enters n-1 levels as thermal source
Hot device；When n is three, high concentration NMMO is obtained by concentrated evaporator from the NMMO aqueous solution after triple effect evaporator discharge concentration
The aqueous solution, concentrated evaporator draw a part of indirect steam as thermal source from 1st effective evaporator above, realize and steamed with preceding triple effect
The combined heat of transmitting apparatus, concentrated evaporator heating steam condensate (SC) enter n-1 level preheaters.
It is 0.0024~0.006MPa that n, which imitates evaporator and the absolute pressure pressure of concentrated evaporator,.
Indirect steam caused by upper 1st effective evaporator enters the heater of lower 1st effective evaporator, and n is imitated two caused by evaporator
Secondary steam enters condensing unit；The heating steam condensate (SC) of 1st effective evaporator enters one-level preheater, the discharge of one-level preheater
Condensed water enters two level preheater together with 2nd effect evaporator heating steam condensate (SC), until the condensed water of n-1 levels preheater discharge
Enter n level preheaters together with the condensed water of n effect evaporator heating steam；The low temperature cold condensate discharge of n levels preheater discharge makees him
With.
When n is three~five, the concentration of the NMMO aqueous solution after the concentration is 65%, the concentrated evaporator discharge
The concentration of the high concentration NMMO aqueous solution is 85%.
When n is six, the indirect steam of last evaporator passes through the sub-cooled water condensation less than 20 DEG C；When n be three,
4th, during one in five, circulating water condensing that the indirect steam of last evaporator passes through air cooling tower.
Embodiment 1
As shown in figure 1, " five effects " evaporation, cocurrent falling liquid film device include 1st effective evaporator 1,2nd effect evaporator 2, triple effect evaporation
Device 3, four-effect evaporator 4, quintuple effect evaporator 5 and one-level preheater 6, two level that preheating of connecting only is fed for 1st effective evaporator 1
Preheater 7, three-level preheater 8, level Four preheater 9, Pyatyi preheater 10；Also include with 1st effective evaporator 1,2nd effect evaporator 2,
The effect circulating pump 11, two that triple effect evaporator 3, four-effect evaporator 4, quintuple effect evaporator 5 connect imitates circulating pump 12, triple effect cycle pump
13rd, quadruple effect circulating pump 14, five imitates circulating pump 15,
Under working condition, pending concentration is the 15% low temperature NMMO aqueous solution, successively by Pyatyi preheater 10, four
Level preheater 9, three-level preheater 8, two level preheater 7 and one-level preheater 6 are connected after pre-heating temperature elevation, into 1st effective evaporator 1
Evaporation, sequentially enters 2nd effect evaporator 2, triple effect evaporator 3, four-effect evaporator 4, quintuple effect evaporator 5 and evaporates afterwards, is steamed from five effects
Send out the NMMO aqueous solution that the concentration of the discharge concentrate of device 5 is 65%；Indirect steam caused by 1st effective evaporator 1 enters two effects and evaporated
The heater of device 2, indirect steam caused by 2nd effect evaporator 2 enter the heater of triple effect evaporator 3, and triple effect evaporator 3 produces
Indirect steam enter the heater of four-effect evaporator 4, indirect steam caused by four-effect evaporator 4 enters quintuple effect evaporator 5
Heater；The heating steam condensate (SC) of 1st effective evaporator 1 enters one-level preheater 6, the condensed water that one-level preheater 6 is discharged together with
2nd effect evaporator 2 heats steam condensate (SC) and enters two level preheater 7；The condensed water that two level preheater 7 is discharged is together with triple effect evaporation
Device 3 heats steam condensate (SC) and enters three-level preheater 8；The condensed water that three-level preheater 8 is discharged heats together with four-effect evaporator 4 to be steamed
Vapour condensed water enters level Four preheater 9；The condensed water that level Four preheater 9 is discharged heats the condensation of steam together with quintuple effect evaporator 5
Water enters Pyatyi preheater 10；The low temperature cold condensate discharge that Pyatyi preheater 10 is discharged is used for other purposes.
1st effective evaporator 1,2nd effect evaporator 2, triple effect evaporator 3, four-effect evaporator 4, quintuple effect evaporator 5 steam chamber in
Provided with for stopping the liquid barrier of high material casting liquid and the silk screen for being efficiently separated to the mist in indirect steam；One effect
It is No leakage circulating pump that circulating pump 11, two, which imitates circulating pump 12, triple effect cycle pump 13, quadruple effect circulating pump 14, five and imitates circulating pump 15,.
1st effective evaporator 1,2nd effect evaporator 2, triple effect evaporator 3, four-effect evaporator 4, the structure design of quintuple effect evaporator 5
For cocurrent falling film evaporator.
One-level preheater 6, two level preheater 7, three-level preheater 8, level Four preheater 9, Pyatyi preheater 10 are full weldering
Connect the plate type heat exchanger of formula.
The indirect steam of quintuple effect evaporator 5 cools down into condenser 16, and condenser 16 is provided with cooling water inlet 17 and steamed
Vapour injector 18, the other end of steam jet ejector 18 connect with secondary condenser 19, and secondary condenser 19 is provided with water ejector 20, water
One end of injector 20 is connected by water ejector working barrel 21 with injector water tank 22, and the other end of water ejector 20 is direct
Connected with injector water tank 22, condenser 16 and secondary condenser 19 connect with water sealed tank 23.
Embodiment 2
As shown in Fig. 2 " five effects couple dense effect " evaporation, cocurrent falling liquid film device, with " five effects " evaporation, cocurrent in embodiment 1
The difference of falling liquid film device is, in addition to the concentrated evaporator 24 of concentrated evaporator 24 is provided with dense effect circulating pump 25,
The structure design of concentrated evaporator 24 is cocurrent falling film evaporator,
Under working condition, the NMMO aqueous solution that concentration is 65% obtains the NMMO water that concentration is 85% by concentrated evaporator
Solution, concentrated evaporator 24 draw a part of indirect steam as thermal source from triple effect evaporator 3 above, realize and join with first five effect
Heat supply is closed, concentrated evaporator 24 heats steam condensate (SC) and enters level Four preheater 9.
It is provided with the steam chamber of concentrated evaporator 24 and is used to stop the liquid barrier of high material casting liquid and for indirect steam
In the silk screen that is separated of mist, dense effect circulating pump 24 is No leakage circulating pump.
The indirect steam of concentrated evaporator 24 condenses into condenser 16.
Embodiment 3
As shown in figure 3, " five effects " evaporation, cocurrent falling liquid film device in " five effects " evaporation, countercurrent falling-film device, with embodiment 1
Difference be, 1st effective evaporator 1`, 2nd effect evaporator 2`, triple effect evaporator 3`, four-effect evaporator 4`, quintuple effect evaporator
5` structure design is reverse-flow falling film evaporator.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (9)
- A kind of 1. evaporation concentration device of the cellulose solvent NMMO aqueous solution, it is characterised in that：An effect including being sequentially connected with is steamed It is pre- that hair device, 2nd effect evaporator feed connect the one-level preheater preheated, two level until n effect evaporators and only for 1st effective evaporator Hot device is until n level preheaters；Also include respectively with 1st effective evaporator, 2nd effect evaporator until the effect that n effect evaporators are connected is followed Ring pump, two imitate circulating pumps until n effect circulating pumps, wherein, one in n tetra-, five, six,A kind of evaporation concentration device of cellulose solvent NMMO aqueous solution also includes being used to evaporate with what n effect evaporators were connected The concentrated evaporator of the high concentration NMMO aqueous solution is concentrated to give, concentrated evaporator is provided with dense effect circulating pump,Under working condition, the NMMO aqueous solution of pending low temperature, successively by n levels preheater, n-1 levels preheater until one-level After preheater series connection pre-heating temperature elevation, evaporated into 1st effective evaporator, sequentially enter 2nd effect evaporator afterwards until n effect evaporators steam Hair, the NMMO aqueous solution after n effect evaporator discharge concentrations；Indirect steam caused by upper 1st effective evaporator enters next effect and evaporated The heater of device, indirect steam caused by n effect evaporators enter condensing unit；The heating steam condensate (SC) of 1st effective evaporator enters One-level preheater, the condensed water of one-level preheater discharge enter two level preheater together with 2nd effect evaporator heating steam condensate (SC), Until the condensed water of n-1 levels preheater discharge enters n level preheaters together with the condensed water of n effect evaporator heating steam；N levels preheat The low temperature cold condensate discharge of device discharge is used for other purposes, passes through concentrated evaporator from the NMMO aqueous solution after n effect evaporator discharge concentrations The high concentration NMMO aqueous solution is obtained, the indirect steam for drawing a part of n-2 effects or n-3 effect evaporators enters concentrated evaporator, dense Effect evaporator heating steam condensate (SC) enters n-1 level preheaters.
- A kind of 2. evaporation concentration device of cellulose solvent NMMO aqueous solution according to claim 1, it is characterised in that：Respectively It is provided with the steam chamber of effect evaporator and concentrated evaporator and is used to stop the liquid barrier of high material casting liquid and for indirect steam In the silk screen that is efficiently separated of mist；Each effect circulating pump and dense effect circulating pump are electromagnetic drive without sealing circulating pump or nothing Leak circulating pump.
- A kind of 3. evaporation concentration device of cellulose solvent NMMO aqueous solution according to claim 1, it is characterised in that：Respectively The structure design for imitating evaporator and concentrated evaporator is cocurrent falling film evaporator.
- A kind of 4. evaporation concentration device of cellulose solvent NMMO aqueous solution according to claim 1, it is characterised in that：Respectively Level preheater is the plate type heat exchanger of full welded type.
- It is 5. a kind of using a kind of cellulose solvent NMMO aqueous solution of the evaporation concentration device of the cellulose solvent NMMO aqueous solution Evaporating and concentrating process, it is characterised in that there is following processing step：S1, series connection preheating：The NMMO aqueous solution of pending low temperature is successively by n levels preheater, n-1 levels preheater until one-level Reach the high temperature close to boiling point after preheater series connection pre-heating temperature elevation, wherein, one in n tetra-, five, six；S2, an effect charging：It will reach after preheating and fed close to the NMMO aqueous solution of the high temperature of boiling point from 1st effective evaporator；S3, following current evaporation：Feed liquid is discharged into 2nd effect evaporator evaporation from an effect after 1st effective evaporator evaporates, until entering N effect evaporator discharge feed liquids, the NMMO aqueous solution after being concentrated,The discharge overfall respectively imitated is arranged at liquid level, is higher by the feed liquid of liquid level and overflow, passes through the charging of U-tube and aftereffect Mouth connects, and balances the pressure difference between each effect evaporator with U-tube, and the liquid level of each effect is kept constant；S4, dense effect connection heat：From the NMMO aqueous solution after n effect evaporator discharge concentrations high concentration NMMO is obtained by concentrated evaporator The aqueous solution, concentrated evaporator draw a part of indirect steam and are used as thermal source from n-2 effects above or n-3 effect evaporators, realize and The combined heat of preceding n effects vaporising device, concentrated evaporator heating steam condensate (SC) enter n-1 level preheaters.
- A kind of 6. evaporating and concentrating process of cellulose solvent NMMO aqueous solution according to claim 5, it is characterised in that：n The absolute pressure pressure for imitating evaporator and concentrated evaporator is 0.0024~0.006MPa.
- A kind of 7. evaporating and concentrating process of cellulose solvent NMMO aqueous solution according to claim 5, it is characterised in that：On Indirect steam caused by 1st effective evaporator enters the heater of lower 1st effective evaporator, and indirect steam caused by n effect evaporators enters Condensing unit；The heating steam condensate (SC) of 1st effective evaporator enters one-level preheater, the condensed water of one-level preheater discharge together with 2nd effect evaporator heating steam condensate (SC) enters two level preheater, until the condensed water of n-1 levels preheater discharge is imitated together with n and evaporated The condensed water of device heating steam enters n level preheaters；The low temperature cold condensate discharge of n levels preheater discharge is used for other purposes.
- A kind of 8. evaporating and concentrating process of cellulose solvent NMMO aqueous solution according to claim 5, it is characterised in that：When When n is four~five, the concentration of the NMMO aqueous solution after the concentration is 65%, the high concentration NMMO of the concentrated evaporator discharge The concentration of the aqueous solution is 85%.
- A kind of 9. evaporating and concentrating process of cellulose solvent NMMO aqueous solution according to claim 5, it is characterised in that：When When n is six, the indirect steam of last evaporator passes through the sub-cooled water condensation less than 20 DEG C；One in n is four, five When, circulating water condensing that the indirect steam of last evaporator passes through air cooling tower.
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| CN106587471A (en) * | 2016-11-29 | 2017-04-26 | 国家开发投资公司 | Sea water desalting device and sea water desalting method |
| CN107008027B (en) * | 2017-05-22 | 2022-12-27 | 许达人 | Multi-effect evaporation concentration process, evaporation crystallization process and device for salt solution containing sulfuric acid and sulfuric acid |
| CN108096865A (en) * | 2018-01-29 | 2018-06-01 | 淮安天然丝纺织科技有限公司 | Lyocell long filament solvent multiple-effect evaporation retracting devices |
| DE102019116736B4 (en) * | 2019-06-20 | 2022-03-24 | List Technology Ag | Production process and apparatus for producing a dope from recycled fibers using the solvent process |
| CN113769424A (en) * | 2021-09-29 | 2021-12-10 | 重庆博张智能装备有限公司 | Four-effect counter-current falling film evaporation process |
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