CN102512835A - Multi-effect plate type rising film countercurrent evaporation concentration device and method thereof - Google Patents
Multi-effect plate type rising film countercurrent evaporation concentration device and method thereof Download PDFInfo
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Abstract
The present invention relates to the technical fields of a multi-effect evaporation concentration process and equipment, and specifically to a multi-effect plate type rising film countercurrent evaporation concentration device and a method thereof. The device comprises a plate type heat exchanger structure and a flash evaporation tank structure. The device is characterized in that the device comprises five groups of plate type rising film countercurrent evaporation devices, wherein the five groups of the plate type rising film countercurrent evaporation devices form a series connection; each group of the plate type rising film countercurrent evaporation device comprises a plate type heat exchanger, a flash evaporation tank, and a pump; each group of the plate type rising film countercurrent evaporation device is in the sealed negative pressure system condition; the pressure inside each group of the device is increased along with the increase of the raw material liquid concentration. The raw materials are subjected to heat exchange through the plate type heat exchanger, and then are separated from the solvent through the flash evaporation separator. The heat exchange treatments are sequentially performed until the material enters the fifth group of the flash evaporation tank. The heat-exchanged steam and the steam discharged from the outlet of the fifth group of the flash evaporation tank are introduced into the outlet pipe. With the present invention, the heat energy of the secondary steam after separation is completely utilized; the reverse heat exchange of the heat exchanger and the designed negative pressure and temperature condition limit the generation of the vaporization phenomenon of the material liquid in the heating process so as to reduce the scaling possibility.
Description
[technical field]
The present invention relates to multiple-effect evaporation concentration technology and equipment technical field, board-like film countercurrent evaporation enrichment facility and the method for rising of a kind of specifically multiple-effect.
[background technology]
At present, evaporating and concentrating process generally adopts shell-and-tube heat exchanger or plate type heat exchanger, and shell-and-tube heat exchanger is because it is bulky: the package unit height is from two of tens meters to tens meters needs and above operating platform; Be restricted in many aspects: like requirement of material rerum natura, process conditions etc.So most shell-and-tube heat exchangers generally can only be accomplished the triple effect design, heat exchange efficiency is low excessively, and therefore the plate type heat exchanger replaces gradually.
Domestic patent CN1864783A discloses a kind of multi-effect distilling method for desalt and condensation and device is and the immediate domestic prior art of the present invention; A kind of multiple-effect is provided in open file, and has carried out the technology of evaporation and concentration step by step; This process using the purpose of countercurrent flow be that the crystallization that reduces in the heat transfer process is separated out, still, this design does not have the step of flash separation in the multiple-effect heat transfer process; In heat exchanger, can there be a large amount of vaporization phenomenons; Can cause great damage to equipment, in addition, can reduce the intensification thickening efficiency.In addition, its equipment has adopted plate type heat exchanger, yet but wherein heat exchanger plates is not carried out concrete design, lacks flashing apparatus, under normal pressure, concentrates, and all can cause very big influence to concentration technology.
[summary of the invention]
The objective of the invention is to solve the phenomenon that easy and crystalline is separated out when concentrating heat-sensitive substance in the prior art, provide a kind of multiple-effect board-like film countercurrent evaporation enrichment facility and the method for rising.
For realizing that above-mentioned purpose designs the board-like film countercurrent evaporation enrichment facility that rises of a kind of multiple-effect; Comprise plate type heat exchanger structure, flash tank structure; It is characterized in that comprising the board-like film counter flow evaporation plants that rise of five groups of series connection, every group of board-like film counter flow evaporation plant that rises comprises a plate type heat exchanger, a flash tank, a pump, is connected pipeline between the medium channel outlet of plate type heat exchanger and the import of flash tank; The steam channel outlet of plate type heat exchanger connects the steam (vapor) outlet pipeline
Second group to the 5th group: be connected between the outlet of flash tank bottom and pump inlet between pipeline, pump discharge and last one group plate type heat exchanger medium channel import and be connected pipeline; The steam (vapor) outlet pipeline gathers between back and vacuum tank import and is connected the steam (vapor) outlet pipeline, vacuum tank export with the vavuum pump import between be connected pipeline;
First group to the 4th group: be connected pipeline between the plate type heat exchanger steam channel import of next group of roof door and its of flash tank;
First group: the steam channel import of plate type heat exchanger is connected with extraneous jet chimney, and the outlet at bottom of flash tank connects discharge pipe;
The 5th group: be connected the steam (vapor) outlet pipeline between the roof door of flash tank and plate-type condenser import, be connected pipeline between plate-type condenser outlet and vacuum tank import, the feed pipe of described material liquid is connected with the medium channel import of plate type heat exchanger;
Plate type heat exchanger in first group is an effect plate type heat exchanger; Plate type heat exchanger in second group is two effect plate type heat exchangers; Plate type heat exchanger in the 3rd group is the triple effect plate type heat exchanger; Plate type heat exchanger in the 4th group is the quadruple effect plate type heat exchanger, and the plate type heat exchanger in the 5th group is five to imitate plate type heat exchangers.
Described baffle heater heat exchanger channels draw ratio is 156～170; Heat exchanger plates is herringbone corrugated plating, 30 ° of ripple angles, ripple degree of depth 3.85mm, normal pitch 12.6mm; Effective heating intensity 1200mm, steam angle bore dia 200mm, the steam (vapor) outlet diameter is 200mm.
Described flash tank; Import is at 1/3rd places of tank body from jar end height overall; At the tank body inner top barrier type liquid foam catcher is set, the tank body inner bottom part is provided with liquid level sensor, and said liquid level sensor monitoring liquid level is controlled at tank body from jar end height overall 300～900mm place.
But described extraneous jet chimney and is imitated heat exchangers in series between plate type heat exchanger, but heat exchangers in series on described the 5th group of tank connected steam (vapor) outlet pipeline of flash distillation.
Described feed pipe and five is imitated one or more heat exchangers of can connecting between plate type heat exchanger, and the steam channel of heat exchanger and one or more described first group to the 5th group steam (vapor) outlet pipeline are connected in series.
The buffer tank of can connecting on the described discharge pipe, the buffer tank outlet at bottom connects pump.
One or more in valve, thermometric instrument, the manometer can be set on the described pipeline.
The present invention also comprises the board-like film countercurrent evaporation method for concentration that rises of a kind of multiple-effect; It is characterized in that each the group device in this method all is under the airtight negative pressure system condition; Absolute pressure is between 0.005Mpa～0.06MPa; Control then descends to the 5th group equipment vacuum evaporating temperature that raises in gradient from first group in gradient, the control liquid level at flash tank from jar end height overall 300～600mm place
Raw material is imitated the plate type heat exchanger heat exchange through five; And then the process flash separator separates with solvent; Raw material through separating gets into the quadruple effect plate type heat exchanger;, raise 2～9 ℃ through the plate-type heat-exchange actuator temperature until the 5th group of flash tank like above-mentioned method heat exchange evaporation and concentration step by step at every turn, produce concentrate from first group flash tank outlet at bottom; The steam trend that heat exchange is used is opposite with the raw material trend; One imitate heat exchanger the heat steam that comes from the outside; Raw material is through flash separation after the Steam Heating, and steam gets into two from flash drum overhead and imitates plate type heat exchanger and raw material heat exchange, and heat exchange step by step like this is up to the 5th group flash tank; Get into vacuum tank through first group to the 4th group steam of heat exchange and the steam of the 5th group of flash drum overhead outlet, vacuum tank connects vavuum pump and vacuumizes.
The initial temperature of described charging is 45 ℃, and the employing electrical heating that is lower than 45 ℃ is preheated to 45 ℃.
Butterfly valve solves because the solute that vaporization produces is separated out phenomenon through in pipeline, adding in the described method.
Described control is to regulate the flow of heat exchanger exit steam from first group of method to the 5th group equipment vacuum.
The present invention compares with prior art; Made full use of the heat energy that separates the back indirect steam; Reduced the energy consumption of equipment; The reverse heat-exchange of heat exchanger and the negative pressure of design and temperature conditions restriction feed liquid is at the vaporization phenomenon (vapor-liquid separation) that heating process produces, reduce greatly or avoided the heat exchanger plates surface scale maybe, the method that the pressure in the equipment in the equipment improves along with the raising of material concentration has solved in the common process gluconic acid sodium salt problem of crystallization very easily in concentration process.
[description of drawings]
Fig. 1 is the equipment flowsheet of the embodiment of the invention;
Among the figure: 1. an effect plate type heat exchanger 2,4,6,8,10 is flash tank 3. 2 and imitates plate type heat exchangers 5. triple effect plate type heat exchangers 7. quadruple effect plate type heat exchangers 9. 5 effect plate type heat exchangers 11. extraneous steam inlet 12. material liquid imports 13. vavuum pumps 14. vacuum tanks 15. buffer tanks 16. discharge pipes.
[specific embodiment]
In conjunction with accompanying drawing the present invention is further specified, the manufacturing technology of this device is very clearly concerning this professional people.
Adopt the material stoste of hot method evaporation and concentration to needs: organic solution, inorganic solution, gluconic acid sodium salt (lactone) solution, steel plant wastewater concentrate, fruit juice, dairy products, zymotic fluid, brine waste, industrial wastewater, toxic liquid waste incineration prerequisite are dense, desalinization or the like.
Usually solutes content is less in the original feed liquid body, takes out moisture through evaporation and reaches the high concentration solute liquid purpose of concentration extraction, otherwise or from solution, isolate solute and obtain required distilled water.
Technological process:
Each group device all is under the airtight negative pressure system condition; Absolute pressure is between 0.005Mpa～0.06MPa; Control then descends to the 5th group equipment vacuum evaporating temperature that raises in gradient from first group in gradient, the control liquid level at flash tank from jar end height overall 300～600mm place.Wherein:
The raw material liq flow process:
Rare raw material feed liquid is imported by the outside---gets into five and imitates plate type heat exchanger------circulating pump---quadruple effect plate type heat exchanger---quadruple effect flash tank---circulating pump---triple effect plate type heat exchanger---triple effect flash tank---circulating pump---------circulating pump---------rear pump---output---finished product materials output that one imitates flash tank that one imitates plate type heat exchanger that two imitate flash tank that two imitate plate type heat exchanger that five imitate flash tank
The heating steam flow process:
Health steam (boiler steam) - Plate heat exchanger into the first effect - into the first generation of secondary steam flash tank efficiency - efficiency plate heat exchanger into the second - the second flash tank generates two effective secondary steam - plate heat exchanger efficiency into the third - the third generation of secondary steam flash tank efficiency - efficiency plate heat exchanger into the fourth - the fourth generation of secondary steam flash tank efficiency - into the fifth efficiency plate heat exchanger - effective flash tank into the fifth generation of secondary steam - into the plate condenser cooling generated condensate - into the first vacuum balance tank - condensate pump - discharge.
Embodiment 1:
Gluconic acid sodium salt stoste concentrates: 45 degrees centigrade of temperature, Baume degrees 16, the five effect unit vacuum absolute pressure 0.0123MPa when the mother liquor that oxidizing process generates gets into this unit the 5th effect, 50 degrees centigrade of evaporating temperatures; The mother liquor temperature is that 50 degrees centigrade, Baume degrees are brought up to about 18～19, the quadruple effect unit vacuum absolute pressure 0.018MPa, 57 degrees centigrade of evaporating temperatures when getting into the quadruple effect evaporation element behind the dehydration by evaporation; The mother liquor temperature is that 57 degrees centigrade, Baume degrees are brought up to about 21, the triple effect unit vacuum absolute pressure 0.024MPa, 64 degrees centigrade of evaporating temperatures when getting into the triple effect evaporation unit behind the dehydration by evaporation; Through getting into second temperature of mother liquor when imitating evaporation element behind the dehydration by evaporation is that 64 degrees centigrade, Baume degrees are brought up to about 24, the second effect unit vacuum absolute pressure 0.033MPa, 72 degrees centigrade of evaporating temperatures; Through getting into first temperature of mother liquor when imitating evaporation element behind the dehydration by evaporation is that 72 degrees centigrade, Baume degrees are brought up to about 27, the first effect unit vacuum absolute pressures 0.047,80 degrees centigrade of evaporating temperatures; First imitates mother liquor Baume degrees that vacuum separation goes out brings up to approximately 30, and 80 degrees centigrade of temperature, concentration are about 80%, and the parameter that has reached finished fluid is exported by positive displacement pump.
Embodiment 2:
Glucose lactone stoste concentrates: original concentration about 17% when the mother liquor that fermentation method generates gets into this unit; Temperature is about 30～35 degrees centigrade; Be promoted to month 40 degrees centigrade of entering the 5th effects through plate-type condenser, condensed water heat exchanger temperature after heating like series connection; The 5th effect unit vacuum absolute pressure is controlled at 0.01MPa, 46 degrees centigrade of evaporating temperatures; The mother liquor temperature is 46 degrees centigrade when getting into the quadruple effect evaporation element behind the process dehydration by evaporation, quadruple effect unit vacuum absolute pressure 0.015MPa, 53 degrees centigrade of evaporating temperatures; The mother liquor temperature is 53 degrees centigrade when getting into the triple effect evaporation unit behind the process dehydration by evaporation, triple effect unit vacuum absolute pressure 0.02MPa, 60 degrees centigrade of evaporating temperatures; The mother liquor temperature is 60 degrees centigrade when imitating evaporation element through entering behind the dehydration by evaporation second, the second effect unit vacuum absolute pressure 0.03MPa, 69 degrees centigrade of evaporating temperatures; The mother liquor temperature is 69 degrees centigrade when imitating evaporation element through entering behind the dehydration by evaporation first, the first effect unit vacuum absolute pressure 0.04,75 degrees centigrade of evaporating temperatures; First imitate mother liquid concentration that vacuum separation goes out bring up to about 70～80%, 75 degrees centigrade of temperature, the parameter that has reached finished fluid is exported by positive displacement pump.
Main points:
(1) to take to rise film reverse-flow for the plate type heat exchanger flow process, and heat transfer coefficient is higher, uniform distribution of temperature field, and cloth liquid is even, the dry plate phenomenon can not occur.The best draw ratio of plate type heat exchanger heat exchanger channels is between 156～170.
(2) through the heat exchanger plates technical parameter of selecting after the assay optimization many times be: herringbone corrugated, angle 130 degree, degree of depth 3.85mm; Normal pitch 12.6mm; The effective heated length 1200mm of heating plate face, material is stainless 316L, steam angle bore dia 200mm.
(3) plate type heat exchanger indirect steam outlet diameter 200mm; Butterfly valve is housed as the choke valve purposes; Regulate the pressure differential that material liquid is exported by thermal process and indirect steam; Control the pressure of material liquid, make it not occur to produce solute and separate out phenomenon, avoid occurring forming the adverse consequences that fouling causes heat exchange efficiency decline and even equipment failure because of solute implantation heat exchanger plates surface because of vaporization in heating process.
(4) plate type heat exchanger mother liquor outlet takes level to connect with flash tank, and getting into the flash tank height is upwards to be a position of the total Senior Three branch of tank body from pot bottom, and the garden tangent line gets into outside tank body.Upper space guarantees the required enough dischargeable capacitys of vapor-liquid separation, and is provided with grating type liquid foam trap in the gas outlet, top, and bottom liquid storage height should be controlled at 300～600mm automatically through liquid level sensor.
(5) material liquid and heating source adverse current be except having improved advantage such as heat transfer efficiency, because material liquid is along with the also corresponding raising process of raising temperature of concentration has solved in the common process gluconic acid sodium salt in the concentration process difficult problem of crystallization very easily.
The heating steam technical process: 105～110 degrees centigrade of saturated vapor (boiler generation) temperature get into first as thermal source and imitate plate type heat exchanger and add hot mother liquor and generate the indirect steam temperature via flash tank and get into second as thermal source and imitate evaporation element for about 80 degrees centigrade, and second imitates mother liquor is heated and generates indirect steam and remove to heat the triple effect mother liquor.Same process is imitated evaporation element until the 5th successively.Each indirect steam temperature of imitating degree centigrade is: first imitates 80 degrees centigrade, and second imitates 72 degrees centigrade, 64 degrees centigrade of triple effects, and 57 degrees centigrade of quadruple effects, the 5th imitates 50 degrees centigrade.The indirect steam entering plate-type condenser that the 5th effect generates is cooled to condensed water entering vacuum compensator and compiles, by condensate pump vacuum breaker removal system.The condensed water of first effect to the quadruple effect compiles after discharged by condensate pump by getting into the vacuum compensator behind the plate type heat exchanger preheating material liquid.
Principle:
All heating, evaporation, the condensation process processes of this device are all carried out under the system condition of closure, and the fluctuations of vacuum that causes influencing technological operation is unallowed, design and also fully taken into account these problems when making.
The raw material liq that needs to concentrate is imitated heater (plate type heat exchanger) by the outside through the 5th of this unit of pipeline entering; Feed liquid is taken over from the bottom and is got into heater; By can be after the opposite side thermal source steam indirect with the form that rises film flowing from bottom to top at a high speed in the passage between heating plates; The motive force of working fluid comes from liquid and is heated the back by lift that the temperature difference produced; Moment disengaging heater gets into the 5th effect flash tank with liquid form and under the effect of gravity, is separated into two-phase fluid (absolute pressure is less than the pressure in the heater runner in the flash tank) behind the heat energy that the raw material liq absorption is enough in the heat exchanger runner; Rise for the steam component (the 5th imitate be this unit last imitate steam and no longer get into next and imitate as thermal source, other each imitate and then get into the heater of next effect) get into plate type heat exchanger and be condensed into water and converge and get into the vacuum compensator and have the condensate pump of dividing into to export continuously.The 5th imitate the flash tank separate and subside the circulating pump that is provided with via the bottom of feed liquid bottom inlet being heated from bottom to top of transporting to the quadruple effect heater; Feed liquid is heated the back at heater and rises film and get into the quadruple effect flash tank and be separated into two-phase fluid (jar in heater have pressure reduction), and same steam component breaks away from tank body and gets into next effect heater (the 5th effect) removes to heat opposite side in this effect heater as thermal source material.In like manner, it is like this for other each process water between imitating.Each imitates steam and after passing out energy, has also reduced the temperature of self and be phase-changed into condensed water and imitate bottom condensing water conduit output of the hot side of heater through each, and each heater cold water output channel gathers in state (vacuum is produced by the vacuum pump system) lower link of negative pressure to be recycled after pipe gets into the vacuum compensator.And the feed liquid for being higher than back one-level concentration of the heavy phase that gets into flash tank to be liquid descend deposition gets into the upper level heater again and accepts heating.An effect is mobile backward by last effect as the steam that heats thermal source, and material liquid is then imitated to last effect mobile by back one, and each imitates the process more than continuous and repetition constant basis.Owing in heater, presetted the pressure and temperature process conditions; In the heating process generation vaporization phenomenon (vapor-liquid separation) appears so controlled feed liquid; Select heat-exchanger ripple plate structure parameter to help the surface simultaneously, so reduce greatly or avoided the heat exchanger plates surface scale maybe from clear effect.First imitate heater thermal source from external steam or other thermals source, and other thermal source of respectively imitating heater to be isolated steam by the previous stage flash tank provide, realized so that a thermal source is repeatedly utilized to have reached purpose of energy saving.To imitate the heat energy consumed be 1/N to N in theory; According to design of the present invention can accomplish 5～10 imitate and more than; It is many more energy-conservation more to imitate number; And " multiple-effect package " etc. can be accomplished 3 to imitate also be difficult under identical material and process conditions, so only infers according to imitating the number theory, and efficient of the present invention method has than before improved several times.。Last is imitated the steam entering plate-type condenser that separates generation and is condensed into liquids recovery.Thermal source steam is from a preceding effect effect process backward, and feed liquid then is to be imitated to last effect by back one to advance.
The vacuum of system is generated by water ring vacuum pump in advance; Each is imitated and brings into operation in the closed system that has generated; When then imitating heat exchanger to last effect heating steam condensation by each, the vacuum during work clasped; The stable of evaporating temperature confirmed in the control of vacuum, guarantees the completeness that the flash tank vapour-liquid is discrete simultaneously.
Imitate the sudden strain of a muscle separation through each and steam a jar bottom material automatic control of liquid system, can guarantee respectively to imitate the equilibrium heating of heater and then the balance distribution that evaporation capacity is respectively imitated in assurance.
Five imitate the board-like film adverse current flash evaporation vacuum complexes that rise: require to manufacture and design to gluconic acid sodium salt, glucolactone dilute liquid concentration technology, 5 five imitate the board-like operation of passing through to concentrate at the food chemical industry workshop that rises film adverse current flash distillation vacuum technology, and per hour evaporated water is 5 tons; Consume about 1.1 tons of steam; Energy Efficiency Ratio is 1: 4.5, and the existing equipment of same purpose can only accomplish that 2～3 imitate, and evaporates 5 tons of water need consume 3 tons of steam; This unit is per hour practiced thrift about 2 tons of steam; Finished product requisite quality and stable, the energy-saving and water-saving effect is remarkable, reduces about 2/3～3/4 thermal pollution discharge capacity.
Claims (10)
1. board-like film countercurrent evaporation enrichment facility that rises of multiple-effect; Comprise plate type heat exchanger structure, flash tank structure; It is characterized in that comprising the board-like film counter flow evaporation plants that rise of five groups of series connection, every group of board-like film counter flow evaporation plant that rises comprises a plate type heat exchanger, a flash tank, a pump, is connected pipeline between the medium channel outlet of plate type heat exchanger and the import of flash tank; The steam channel outlet of plate type heat exchanger connects the steam (vapor) outlet pipeline
Second group to the 5th group: be connected between the outlet of flash tank bottom and pump inlet between pipeline, pump discharge and last one group plate type heat exchanger medium channel import and be connected pipeline; The steam (vapor) outlet pipeline gathers between back and vacuum tank import and is connected the steam (vapor) outlet pipeline, vacuum tank export with the vavuum pump import between be connected pipeline;
First group to the 4th group: be connected pipeline between the plate type heat exchanger steam channel import of next group of roof door and its of flash tank;
First group: the steam channel import of plate type heat exchanger is connected with extraneous jet chimney, and the outlet at bottom of flash tank connects discharge pipe;
The 5th group: be connected the steam (vapor) outlet pipeline between the roof door of flash tank and plate-type condenser import, be connected pipeline between plate-type condenser outlet and vacuum tank import, the feed pipe of described material liquid is connected with the medium channel import of plate type heat exchanger;
Plate type heat exchanger in first group is an effect plate type heat exchanger; Plate type heat exchanger in second group is two effect plate type heat exchangers; Plate type heat exchanger in the 3rd group is the triple effect plate type heat exchanger; Plate type heat exchanger in the 4th group is the quadruple effect plate type heat exchanger, and the plate type heat exchanger in the 5th group is five to imitate plate type heat exchangers.
2. the board-like film countercurrent evaporation enrichment facility that rises of a kind of multiple-effect as claimed in claim 1; It is characterized in that described baffle heater heat exchanger channels draw ratio is 156～170; Heat exchanger plates is herringbone corrugated plating, 30 ° of ripple angles, ripple degree of depth 3.85mm, normal pitch 12.6mm; Effective heating intensity 1200mm, steam angle bore dia 200mm, the steam (vapor) outlet diameter is 200mm.
3. the board-like film countercurrent evaporation enrichment facility that rises of a kind of multiple-effect as claimed in claim 1; It is characterized in that described flash tank; Import is at 1/3rd places of tank body from jar end height overall; At the tank body inner top barrier type liquid foam catcher is set, the tank body inner bottom part is provided with liquid level sensor, and said liquid level sensor monitoring liquid level is controlled at tank body from jar end height overall 300～900mm place.
4. the board-like film countercurrent evaporation enrichment facility that rises of a kind of multiple-effect as claimed in claim 1; But it is characterized in that heat exchangers in series between a described extraneous jet chimney and an effect plate type heat exchanger, but heat exchangers in series on described the 5th group of tank connected steam (vapor) outlet pipeline of flash distillation.
5. the board-like film countercurrent evaporation enrichment facility that rises of a kind of multiple-effect as claimed in claim 1; It is characterized in that one or more heat exchangers of can connecting between described feed pipe and five effect plate type heat exchangers, the steam channel of heat exchanger and one or more described first group to the 5th group steam (vapor) outlet pipeline are connected in series.
6. the board-like film countercurrent evaporation enrichment facility that rises of a kind of multiple-effect as claimed in claim 1 is characterized in that the buffer tank of can connecting on the described discharge pipe, and the buffer tank outlet at bottom connects pump.
7. like the board-like film countercurrent evaporation enrichment facility that rises of arbitrary described multiple-effect in the claim 1～6, it is characterized in that on described pipeline, can being provided with one or more in valve, thermometric instrument, the manometer.
8. board-like film countercurrent evaporation method for concentration that rises of multiple-effect; It is characterized in that each the group device in this method all is under the airtight negative pressure system condition; Absolute pressure is between 0.005Mpa～O.06MPa; Control then descends to the 5th group equipment vacuum evaporating temperature that raises in gradient from first group in gradient, the control liquid level at flash tank from jar end height overall 300～600mm place
Raw material is imitated the plate type heat exchanger heat exchange through five; And then the process flash separator separates with solvent; Raw material through separating gets into the quadruple effect plate type heat exchanger;, raise 2～9 ℃ through the plate-type heat-exchange actuator temperature until the 5th group of flash tank like above-mentioned method heat exchange evaporation and concentration step by step at every turn, produce concentrate from first group flash tank outlet at bottom; The steam trend that heat exchange is used is opposite with the raw material trend; One imitate heat exchanger the heat steam that comes from the outside; Raw material is through flash separation after the Steam Heating, and steam gets into two from flash drum overhead and imitates plate type heat exchanger and raw material heat exchange, and heat exchange step by step like this is up to the 5th group flash tank; Get into vacuum tank through first group to the 4th group steam of heat exchange and the steam of the 5th group of flash drum overhead outlet, vacuum tank connects vavuum pump and vacuumizes.
9. the board-like film countercurrent evaporation method for concentration that rises of a kind of multiple-effect as claimed in claim 8 is characterized in that the initial temperature of described charging is 45 ℃, and the employing electrical heating that is lower than 45 ℃ is preheated to 45 ℃.
10. the board-like film countercurrent evaporation method for concentration that rises of a kind of multiple-effect as claimed in claim 8 is characterized in that butterfly valve solves because the solute that vaporization produces is separated out phenomenon through in pipeline, adding in the described method.
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