CN109879722A - Low-concentration ethanol recyclable device and method based on MVR - Google Patents

Abstract

A kind of low-concentration ethanol recyclable device and method based on MVR, it include with the Falling film heat transfer device (2) for being set as coupling with rectifying column (1) and to be set as the low-concentration ethanol recyclable device ontology of reboiler (8) coupled with rectifying column (1), it is set as the separator (3) for coupling with Falling film heat transfer device (2) and being used to extract steam, it is set as coupling with separator (3) and reboiler (8) respectively and being used to be promoted the compressor set of vapor (steam) temperature, rectification process is carried out by raw material of the low-concentration ethanol recyclable device ontology to low-concentration ethanol, obtain ethyl alcohol finished product, pass through separator (3) and compressor set, it heats up to the steam of rectification process, it is re-used as the heating source of rectifying column (1), therefore the matching of single column ethanol distillation and MVR evaporation technique is realized, improve the reuse ratio of thermal energy With the consumption for reducing thermal energy.

Description

Low-concentration ethanol recyclable device and method based on MVR

Technical field

The present invention relates to a kind of low-concentration ethanol recyclable device and method, especially a kind of low-concentration ethanol based on MVR Recyclable device and method.

Background technique

Low-concentration ethanol is recycled, to improve the yield of ethyl alcohol, therefore low-concentration ethanol recyclable device and method It is important rectifier unit and method, in existing low-concentration ethanol recyclable device and method, there are no a kind of based on MVR's Low-concentration ethanol recyclable device and method, to realize the matching of single column ethanol distillation and MVR evaporation technique.

Summary of the invention

Object of the invention is a kind of low-concentration ethanol recyclable device based on MVR,

Object of the invention is a kind of low-concentration ethanol recovery method based on MVR.

In order to overcome the technical drawbacks described above, the object of the present invention is to provide a kind of, and the low-concentration ethanol based on MVR recycles dress It sets and method, therefore realizes the matching of single column ethanol distillation and MVR evaporation technique, improve the reuse ratio of thermal energy and reduce The consumption of thermal energy.

In order to achieve the above objectives, the technical solution adopted by the present invention is that:

A kind of low-concentration ethanol recyclable device based on MVR includes with the Falling film heat transfer device for being set as coupling with rectifying column With the low-concentration ethanol recyclable device ontology of the reboiler for being set as coupling with rectifying column, be set as coupling simultaneously with Falling film heat transfer device And it is used to extract the separator of steam, is set as coupling with separator and reboiler respectively and being used to be promoted the pressure of vapor (steam) temperature Contracting unit.

Due to devising separator, compressor set and low-concentration ethanol recyclable device ontology, recycled by low-concentration ethanol Device noumenon carries out rectification process to the raw material of low-concentration ethanol, ethyl alcohol finished product is obtained, by separator and compressor set, to heat The condensate liquid of source condensation is flashed and is compressed heating, is re-used as the heating source of rectifying column, thus realize single column ethanol distillation with The matching of MVR evaporation technique improves the reuse ratio of thermal energy and reduces the consumption of thermal energy.

The present invention devises, separator, compressor set and low concentration in the way of promoting last row again and putting vapor (steam) temperature Alcohol recovering device ontology is coupled to each other.

The present invention devises, and is promoted by way of last row puts vapor (steam) temperature according to MVR separator and compressor set Couple with low-concentration ethanol recyclable device ontology.

The present invention devises, and compressor set is set as including a first compressor and a second compressor.

The present invention devises, and it also includes first circulation pump that low-concentration ethanol recyclable device ontology, which is set as, surge tank, is returned Flow pump, second circulation pump, vacuum pump, the first preheater, the second preheater, condensate water pot and condensate pump.

The present invention devises, and the head tank of low-concentration ethanol is set as through the first preheater and the second preheater and rectifying The input terminal oral area of tower couples, and the output end oral area of rectifying column is set as coupling by Falling film heat transfer device with the finished pot of ethyl alcohol, The fluid output port oral area of Falling film heat transfer device is set as coupling with the input terminal oral area of surge tank and the output port of surge tank Portion is set as coupling by reflux pump with the return port portion of rectifying column, the steam output end oral area of Falling film heat transfer device be set as with The first input end oral area of separator couples and the output port portion of separator is respectively set to through the first compressor and the Two compressors couple with the second input terminal oral area of reboiler, and the second output terminal oral area of reboiler is respectively set to first in advance The heat exchange input terminal oral area connection of the heat exchange input terminal oral area and the second preheater of hot device, the heat exchange of the second preheater are defeated Outlet oral area is set as coupling with the input terminal oral area of condensate water pot, and the first output end oral area of condensate water pot is set as and boils again The third input terminal oral area of device couples and the second output terminal oral area of condensate water pot is set as through condensate pump and separator The connection of the second input terminal oral area, the first input end oral area of reboiler is set as being connected to the saturated vapor of heat source and boiling again First output end oral area of device is set as coupling with the heating source of rectifying column, and first circulation pump is provided on Falling film heat transfer device simultaneously And second circulation pump and vacuum pump are respectively arranged on reboiler.

The present invention devises, and the first preheater and the second preheater are set as heat-exchangers of the plate type and the first preheater Material input oral area is set as coupling with the head tank of low-concentration ethanol, and the material output end oral area of the first preheater is set as Couple with the material input oral area of the second preheater, the material output end oral area of the second preheater is set as the object with rectifying column Expect the connection of input terminal oral area, the heat exchange input terminal oral area of the first preheater is set as joining with the output end oral area that second circulation pumps It connects and the heat exchange output end oral area of the first preheater is set as coupling with waste pipe, the heat exchange input of the second preheater Port part is set as coupling with the lower end output end oral area of reboiler and the heat exchange output end oral area of the second preheater is arranged To couple with the middle part input terminal oral area of condensate water pot.

The present invention devises, and rectifying column is set as the tower-like body of cylindricality and the state of rectifying column is set as air-distillation, The material input oral area that material input oral area and rectifying column are provided in the middle part of rectifying column is set as and the second preheater Connection, sets in the output end oral area that the top end part of rectifying column is respectively arranged with output end oral area and return port portion and rectifying column Be set to couple with Falling film heat transfer device, the return port portion of rectifying column is set as coupling with reflux pump, in the end portion of rectifying column Be not provided with plus heat-exchange tube and rectifying column plus heat-exchange tube input terminal oral area be set as coupling with reboiler, rectifying column Plus heat-exchange tube output end oral area be set as with second circulation pump couple.

The present invention devises, and the state of Falling film heat transfer device is set as negative pressure, and the upper end port portion of Falling film heat transfer device is set as Couple with the output end oral area of first circulation pump and the lower end port portion of Falling film heat transfer device is set as defeated with first circulation pump The connection of inbound port portion is provided with the input terminal oral area setting of input terminal oral area and Falling film heat transfer device in the upper end of Falling film heat transfer device To couple with rectifying column, the bottom of Falling film heat transfer device is provided with the liquid output of fluid output port oral area and Falling film heat transfer device Port part is set as coupling with surge tank, and the lower end of Falling film heat transfer device is provided with steam output end oral area and Falling film heat transfer device Steam output end oral area be set as coupling with separator.

The present invention devises, and first circulation pump is set as high-temperature pump and first circulation pump setting is devised in the present invention, Surge tank is set as cylindricality tank-like body, sets in the input terminal oral area that the upper end of surge tank is provided with input terminal oral area and surge tank It is set to and couples with Falling film heat transfer device, the bottom end of surge tank is provided with the output end oral area setting of output end oral area and surge tank To couple with reflux pump.

The present invention devises, and the input terminal oral area of reflux pump is set as coupling with surge tank and the input port of reflux pump Portion is respectively set to couple with the finished pot of rectifying column and ethyl alcohol.

The present invention devises, and separator is set as gas-liquid separator, and the middle part of separator is provided with first input end The first input end oral area of oral area and the second input terminal oral area and separator is set as coupling with Falling film heat transfer device, separator Second input terminal oral area is set as coupling with condensate pump, and the top of separator is provided with output end oral area and separator Output end oral area is set as coupling with the first compressor, and the bottom end of separator is provided with fluid output port oral area and separator Fluid output port oral area be set as with first circulation pump couple.

The present invention devises, and a first compressor and a second compressor is set as being in tandem connection and the first compressor Input terminal oral area is set as coupling with separator, and the output end oral area of the first compressor is set as the input terminal with the second compressor The output end oral area of oral area connection and the second compressor is set as coupling with reboiler.

The present invention devises, and the state of reboiler is set as normal pressure, and the upper end end port part of reboiler is set as and second The output end oral area of circulating pump couples and the lower end end port part of reboiler is set as the input terminal oral area pumped with second circulation Connection, is respectively arranged with the vacuum ports of vacuum end oral area and third input terminal oral area and reboiler in the middle part of reboiler Portion is set as coupling with vacuum pump, the third input terminal oral area of reboiler is set as coupling with condensate water pot, in the upper of reboiler The first input end oral area that end is respectively arranged with first input end oral area and the second input terminal oral area and reboiler be set as with The saturated vapor connection of heat source, the second input terminal oral area of reboiler are set as coupling with the second compressor, under reboiler The first output end oral area that end is respectively arranged with the first output end oral area and second output terminal oral area and reboiler be set as with Rectifying column couples, the second output terminal oral area of reboiler is set as coupling with the second preheater.

The present invention devises, and second circulation pump is set as high-temperature pump and the input port portion of second circulation pump is respectively set To couple with rectifying column and reboiler, the output end oral area of second circulation pump is set as coupling with reboiler.

The present invention devises, and vacuum pump is arranged on reboiler.

The present invention devises, and condensate water pot is set as cylindricality tank-like body, and the middle part of condensate water pot is provided with input terminal The input terminal oral area of oral area and condensate water pot is set as coupling with the second preheater, and the top of condensate water pot is provided with first First output end oral area of output end oral area and condensate water pot is set as coupling with reboiler, is arranged in the bottom end of condensate water pot There is the second output terminal oral area of second output terminal oral area and condensate water pot to be set as coupling with condensate pump.

The present invention devises, the input terminal oral area of condensate pump be set as coupling with condensate water pot and condensate pump it is defeated Outlet oral area is set as coupling with separator.

The present invention devises, and rectifying column, Falling film heat transfer device, first circulation pump, surge tank, reflux pump, reboiler, second follow Ring pump, vacuum pump, the first preheater, the second preheater, condensate water pot and condensate pump and separator, the first compressor and second Compressor is set as being distributed in the way of heating up again.

The present invention devises, and a kind of low-concentration ethanol recovery method based on MVR the steps include:

The alcohol vapour generated by rectifying column is converted into the Falling film heat transfer device of ethanol liquid, rectifying column is heated and keeps rectifying column Lower end temperature be 103-105 DEG C and rectifying column upper end temperature be 78.5-80.5 DEG C reboiler, changed from falling liquid film The separator that last row puts steam is extracted in hot device, puts the temperature that steam is heated and last row is kept to put steam to last row is extracted It is 108-110 DEG C, last row is put steam and is re-introduced into reboiler.

The present invention devises, and the steps include: that the raw material in the head tank of low-concentration ethanol enters in the first preheater, then It enters in the second preheater, carries out the pre-heat treatment in the first preheater and the second preheater, obtaining temperature is 65 DEG C -70 DEG C Raw material, rectifying column is injected by the material input oral area of rectifying column, temperature is 65 DEG C -75 DEG C of original in rectifying column Material is thermally formed alcohol vapour, and alcohol vapour is entered by the output end oral area of rectifying column and the input terminal oral area of Falling film heat transfer device Into Falling film heat transfer device, cooling processing is carried out in Falling film heat transfer device, keeping the temperature of Falling film heat transfer device is 72-74 DEG C and falling liquid film The vacuum degree of heat exchanger is set as -0.062MPa to -0.067MPa, alcohol vapour is formed ethanol liquid, ethanol liquid passes through The gentle input terminal oral area for rushing tank of the fluid output port oral area of Falling film heat transfer device is injected into surge tank, by reflux pump, ethyl alcohol A portion of liquid is injected into the finished pot of ethyl alcohol, and wherein another part injection of ethanol liquid is passed through rectifying column Return port portion is re-introduced into rectifying column, and the liquid and steam of Falling film heat transfer device pass through the steam output end mouth of Falling film heat transfer device The first input end oral area of portion and separator is injected into separator, and the last row of separator puts steam and passes through the first compressor and the Two compressors handle to obtain 108-110 DEG C of steam, and 108-110 DEG C of steam is injected by the second input terminal oral area of reboiler Into reboiler, the saturated vapor of heat source is injected into reboiler by the first input end oral area of reboiler, is formed heating and is steamed Vapour, heating steam by the first output end oral area of reboiler be injected into rectifying column add heat-exchange tube, keep under rectifying column The temperature of end is 103-105 DEG C and the temperature of the upper end of rectifying column is 78.5-80.5 DEG C, and heating steam passes through reboiler Second output terminal oral area is injected into the second preheater, and the liquid of rectifying column plus heat-exchange tube liquid and reboiler passes through the Two circulating pumps are injected separately into the neutralization of the first preheater and flow back into reboiler, and the liquid of the first preheater is arranged by waste pipe Out, the liquid of the second preheater is injected into condensate water pot, and the steam of condensate water pot passes through the third input terminal oral area of reboiler It is injected into reboiler, the liquid of condensate water pot is injected into separator by condensate pump, and first circulation is pumped Falling film heat transfer The liquid progress of device recycles in Falling film heat transfer device, and vacuum pump carries out extraction emptying to the on-condensible gas of reboiler.

The technical effects of the invention are that: MVR low-concentration ethanol rectification technique is a kind of single column ethanol distillation and MVR The combination of evaporation technique, the rectifying column top exit couple with evaporator, and ethyl alcohol rectifying pump evaporates the alcohol that top of tower comes out Heat source of the steam as evaporator, the ethanol liquid part being condensed are taken out as finished product, remaining flows back into essence by pump, pipeline Top of tower is evaporated, rectifying column working condition is air-distillation, and 103 DEG C of rectifying column bottom temperature, top is 78.5 DEG C warm, and evaporator operation state is Negative pressure, by vacuum and the cold formation negative pressure of tail, 72 DEG C of operating temperature, evaporator uses falling film type evaporation, evaporator outlet with point Couple from device import, the secondary steam and water that evaporator generates enter separator, are recycled to evaporation through pump, pipeline through separation liquid At the top of device, heat source of the alcohol vapour as evaporator in this technique, alcohol vapour is evaporated circulating water condensing, saves condensation Water, the secondary steam that evaporator generates are used as the heat source of rectifying column to save steam, separator outlet and level-one pressure after compression Contracting machine import connection, separator flash-off steam rise to 108 DEG C through two second compression of vapour compression machine, by temperature, again into rectifying column Device is boiled as rectifying column heat source, condensate water pot is entered after the charging of steam condensate (SC) preheating rectifying column, rectifying tower reboiler is drop Membrane type, the low-concentration ethanol from head tank are sent into rectifying column after waste water, the preheating of steam condensate (SC) two-stage, are separated through rectifying, Waste water send sewage treatment plant after tower bottom is discharged into level-one feed preheater, and the alcohol steam through rectifying concentration is from top of tower Outlet is discharged into falling film evaporator shell side, and alcohol vapour is condensed into liquid ethanol in evaporator and enters return tank, a part Send rectifying column top as reflux through pump, pipeline, a part takes a certain amount of as finished product, evaporator generation after pump on pipeline Secondary steam confuse condensed water and enter separator together, the water after separation is pumped up at the top of evaporator and recycles, secondary steaming Vapour sequentially enters level-one vapour compression machine, second level Pistonless compressor through pipeline, and compressed steam temperature rise is to 108 DEG C, into essence Evaporate heating source of the tower reboiler as rectifying column.After the steam condensate (SC) preheating material of reboiler through condensate water pot, condensate pump, Pipeline enters separator circulation utilization.

In the technical scheme, low-concentration ethanol refers to that concentration is the ethyl alcohol of 25o-80o.

In the technical scheme, it then promotes last row and puts the separator of vapor (steam) temperature, compressor set and low-concentration ethanol recycling Device noumenon is important technical characteristic, in the technical field of the low-concentration ethanol recyclable device based on MVR and method, is had new Newness, creativeness and practicability, term in the technical scheme are all that can be carried out with patent document in the art Explanation and understanding.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.

Fig. 1 is a kind of schematic diagram of low-concentration ethanol recyclable device based on MVR of the invention,

Rectifying column -1, first circulation pump -21, separator -3, the first compressor -4, the second compressor -5, delays Falling film heat transfer device -2 Rush tank -6, reflux pump -7, reboiler -8, second circulation pump -81, vacuum pump -82, the first preheater -9, the second preheater -91, Condensate water pot -92, condensate pump -93.

Specific embodiment

According to guidelines for examination, such as " having ", "comprising" and " comprising " term used in the present invention should understand that For the presence or addition for not allotting one or more of the other element or combinations thereof.

In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical", The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ", " third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.

As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments It can be combined with each other at conflict, in addition, unless stated otherwise, used equipment and material are equal in the following embodiments Be it is commercially available, such as do not clearly state treatment conditions, please refer to purchase product description or according to this field routine Method into.

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

A kind of low-concentration ethanol recyclable device based on MVR, Fig. 1 are one embodiment of the invention, are had in conjunction with attached drawing Body illustrates the present embodiment, includes rectifying column 1, Falling film heat transfer device 2, first circulation pump 21, separator 3, the first compressor 4, the Two compressors 5, surge tank 6, reflux pump 7, reboiler 8, second circulation pump 81, vacuum pump 82, the preheating of the first preheater 9, second Device 91, condensate water pot 92 and condensate pump 93,

The head tank of low-concentration ethanol is set as the input port by the first preheater 9 and the second preheater 91 and rectifying column 1 Portion's connection, the output end oral area of rectifying column 1 are set as coupling by Falling film heat transfer device 2 with the finished pot of ethyl alcohol, Falling film heat transfer device 2 Fluid output port oral area be set as coupling with the input terminal oral area of surge tank 6 and the output end oral area of surge tank 6 is set as Coupled by reflux pump 7 with the return port portion of rectifying column 1, the steam output end oral area of Falling film heat transfer device 2 is set as and separates The first input end oral area of device 3 couples and the output port portion of separator 3 is respectively set to through the first compressor 4 and second Compressor 5 couples with the second input terminal oral area of reboiler 8, and the second output terminal oral area of reboiler 8 is respectively set to and first The connection of the heat exchange input terminal oral area of the heat exchange input terminal oral area of preheater 9 and the second preheater 91, the second preheater 91 Heat exchange output end oral area is set as coupling with the input terminal oral area of condensate water pot 92, the first output end oral area of condensate water pot 92 It is set as coupling with the third input terminal oral area of reboiler 8 and the second output terminal oral area of condensate water pot 92 is set as by cold Condensate pump 93 couples with the second input terminal oral area of separator 3, and the first input end oral area of reboiler 8 is set as full with heat source It is set as coupling with the heating source of rectifying column 1 with the first output end oral area of vapor communication and reboiler 8, in Falling film heat transfer device It is provided with first circulation pump 21 on 2 and is respectively arranged with second circulation pump 81 and vacuum pump 82 on reboiler 8.

In the present embodiment, the first preheater 9 and the second preheater 91 are set as heat-exchangers of the plate type and the first preheating The material input oral area of device 9 is set as coupling with the head tank of low-concentration ethanol, the material output end oral area of the first preheater 9 Be set as coupling with the material input oral area of the second preheater 91, the material output end oral area of the second preheater 91 be set as with The material input oral area of rectifying column 1 couples, and the heat exchange input terminal oral area of the first preheater 9 is set as pumping 81 with second circulation The connection of output end oral area and the heat exchange output end oral area of the first preheater 9 be set as couple with waste pipe, second in advance The heat exchange input terminal oral area of hot device 91 is set as coupling with the lower end output end oral area of reboiler 8 and the second preheater 91 Heat exchange output end oral area is set as coupling with the middle part input terminal oral area of condensate water pot 92.

By the first preheater 9 and the second preheater 91, forms and 81 and are pumped to rectifying column 1, reboiler 8, second circulation The support tie point of condensate water pot 92 realizes the connection with rectifying column 1 by the second preheater 91, realizes and reboiler 8 Connection, realizes the connection with condensate water pot 92, by the first preheater 9, realizes the connection with second circulation pump 81, technology Purpose is: for realizing pre-add heat treatment to low-concentration ethanol raw material.

In the present embodiment, rectifying column 1 is set as the tower-like body of cylindricality and the state of rectifying column 1 is set as air-distillation, It is set as with second in advance in the material input oral area that the middle part of rectifying column 1 is provided with material input oral area and rectifying column 1 Hot device 91 couples, and is respectively arranged with the output of output end oral area and return port portion and rectifying column 1 in the top end part of rectifying column 1 Port part is set as coupling with Falling film heat transfer device 2, the return port portion of rectifying column 1 is set as coupling with reflux pump 7, in rectifying column 1 lower end, which is respectively arranged with, adds the input terminal oral area for adding heat-exchange tube of heat-exchange tube and rectifying column 1 to be set as and boil again The connection of device 8, rectifying column 1 plus the output end oral area of heat-exchange tube be set as pumping with second circulation and 81 couple.

By rectifying column 1, forms and the second preheater 91, Falling film heat transfer device 2, reflux pump 7, reboiler 8 and second are followed The support tie point of ring pump 81 realizes the connection with the second preheater 91 by rectifying column 1, realizes and Falling film heat transfer device 2 Connection, realizes the connection with reflux pump 7, realizes the connection with reboiler 8, realizes the connection with second circulation pump 81, Its technical purpose is: for realizing steam heat treatment to low-concentration ethanol raw material.

In the present embodiment, the state of Falling film heat transfer device 2 is set as negative pressure, the upper end port portion setting of Falling film heat transfer device 2 Output end oral area to pump 21 with first circulation couples and the lower end port portion of Falling film heat transfer device 2 is set as and first circulation pumps 21 input terminal oral area connection, is provided with the input terminal of input terminal oral area and Falling film heat transfer device 2 in the upper end of Falling film heat transfer device 2 Oral area is set as coupling with rectifying column 1, and the bottom of Falling film heat transfer device 2 is provided with fluid output port oral area and Falling film heat transfer device 2 fluid output port oral area is set as coupling with surge tank 6, and the lower end of Falling film heat transfer device 2 is provided with steam output end oral area And the steam output end oral area of Falling film heat transfer device 2 is set as coupling with separator 3.

By Falling film heat transfer device 2, forms and the support of first circulation pump 21, rectifying column 1, surge tank 6 and separator 3 is connected Contact, by Falling film heat transfer device 2, realize with first circulation pump 21 connection, realize the connection with rectifying column 1, realize with The connection of surge tank 6 realizes the connection with separator 3, and technical purpose is: realizing for the steam to low-concentration ethanol Fluidization processing.

In the present embodiment, first circulation pump 21 is set as high-temperature pump and first circulation pump 21 is arranged in Falling film heat transfer device On 2.

By first circulation pump 21, the support tie point to Falling film heat transfer device 2 is formd, by first circulation pump 21, is realized Connection with Falling film heat transfer device 2, technical purpose are: for carrying out Matter Transfer processing to Falling film heat transfer device 2.

In the present embodiment, surge tank 6 is set as cylindricality tank-like body, and the upper end of surge tank 6 is provided with input terminal oral area And the input terminal oral area of surge tank 6 is set as coupling with Falling film heat transfer device 2, and the bottom end of surge tank 6 is provided with output port The output end oral area of portion and surge tank 6 is set as coupling with reflux pump 7.

By surge tank 6, foring is realized the support tie point of Falling film heat transfer device 2 and reflux pump 7 by surge tank 6 With the connection of Falling film heat transfer device 2, the connection with reflux pump 7 is realized, technical purpose is: for storing up to liquid ethanol finished product It deposits.

In the present embodiment, the input terminal oral area of reflux pump 7 is set as coupling with surge tank 6 and the input of reflux pump 7 Port part is respectively set to couple with the finished pot of rectifying column 1 and ethyl alcohol.

By reflux pump 7, foring the support tie point to surge tank 6 and rectifying column 1 is realized and is delayed by reflux pump 7 The connection for rushing tank 6 realizes the connection with rectifying column 1, and technical purpose is: for the output to liquid ethanol finished product.

In the present embodiment, separator 3 is set as gas-liquid separator, and the middle part of separator 3 is provided with the first input The first input end oral area of port part and the second input terminal oral area and separator 3 is set as coupling with Falling film heat transfer device 2, separate Second input terminal oral area of device 3 is set as coupling with condensate pump 93, the top of separator 3 be provided with output end oral area and The output end oral area of separator 3 is set as coupling with the first compressor 4, and the bottom end of separator 3 is provided with fluid outlet port The fluid output port oral area of portion and separator 3 is set as coupling with first circulation pump 21.

By separator 3, forms and the 21, first compressor 4 and condensate pump 93 are pumped to Falling film heat transfer device 2, first circulation Support tie point the connection with Falling film heat transfer device 2 is realized by separator 3, realize with first circulation pump 21 connection, The connection with the first compressor 4 is realized, the connection with condensate pump 93 is realized, technical purpose is: for liquid Separating treatment is carried out with steam.

In the present embodiment, the first compressor 4 and the second compressor 5 are set as in tandem connection and the first compressor 4 input terminal oral area is set as coupling with separator 3, and the output end oral area of the first compressor 4 is set as and the second compressor 5 The output end oral area of the connection of input terminal oral area and the second compressor 5 is set as coupling with reboiler 8.

By the first compressor 4 and the second compressor 5, the support tie point to separator 3 and reboiler 8 is formd, by First compressor 4 and the second compressor 5, realize the connection with separator 3, realize the connection with reboiler 8, technology mesh Be: for steam carry out heating treatment.

In the present embodiment, the state of reboiler 8 is set as normal pressure, and the upper end end port part of reboiler 8 is set as and the The output end oral area of two circulating pumps 81 couples and the lower end end port part of reboiler 8 is set as the input with second circulation pump 81 Port part connection is respectively arranged with vacuum end oral area and third input terminal oral area and reboiler 8 in the middle part of reboiler 8 Vacuum end oral area is set as coupling with vacuum pump 82, the third input terminal oral area of reboiler 8 is set as coupling with condensate water pot 92, The first input of first input end oral area and the second input terminal oral area and reboiler 8 is respectively arranged in the upper end of reboiler 8 Port part is set as being connected to the saturated vapor of heat source, the second input terminal oral area of reboiler 8 is set as and the second compressor 5 It connects, is respectively arranged with the first defeated of the first output end oral area and second output terminal oral area and reboiler 8 in the lower end of reboiler 8 Outlet oral area is set as coupling with rectifying column 1, the second output terminal oral area of reboiler 8 is set as coupling with the second preheater 91.

By reboiler 8, form to rectifying column 1, the second preheater 91, the second compressor 5, second circulation pump 81, true The support tie point of sky pump 82 and condensate water pot 92 realizes the connection with rectifying column 1 by reboiler 8, realizes with second in advance The connection of hot device 91 realizes the connection with the second compressor 5, realize with second circulation pump 81 connection, realize with very The connection of sky pump 82, realizes the connection with condensate water pot 92, technical purpose is: for preheating to rectifying column 1 and second Device 91 provides heat gas.

In the present embodiment, second circulation pump 81 is set as the input port portion difference of high-temperature pump and second circulation pump 81 It is set as coupling with rectifying column 1 and reboiler 8, the output end oral area of second circulation pump 81 is set as coupling with reboiler 8.

By second circulation pump 81, the support tie point to rectifying column 1 and reboiler 8 is formd, pumps 81 by second circulation, The connection with rectifying column 1 is realized, the connection with reboiler 8 is realized, technical purpose is: for being carried out to reboiler 8 Matter Transfer processing.

In the present embodiment, vacuum pump 82 is arranged on reboiler 8.

By vacuum pump 82, the support tie point to reboiler 8 is formd, by vacuum pump 82, is realized and reboiler 8 Connection, technical purpose are: for carrying out Negative pressure to reboiler 8.

In the present embodiment, condensate water pot 92 is set as cylindricality tank-like body, is provided in the middle part of condensate water pot 92 defeated The input terminal oral area of inbound port portion and condensate water pot 92 is set as coupling with the second preheater 91, on the top of condensate water pot 92 The the first output end oral area for being provided with the first output end oral area and condensate water pot 92 is set as coupling with reboiler 8, is condensing The second output terminal oral area that the bottom end of water pot 92 is provided with second output terminal oral area and condensate water pot 92 is set as and condensed water 93 connection of pump.

By condensate water pot 92, the support tie point to the second preheater 91, reboiler 8 and condensate pump 93 is formd, By condensate water pot 92, the connection with the second preheater 91 is realized, the connection with reboiler 8 is realized, realized and condensed water The connection of pump 93, technical purpose are: for storing to liquid and steam.

In the present embodiment, the input terminal oral area of condensate pump 93 is set as coupling with condensate water pot 92 and condensate pump 93 output end oral area is set as coupling with separator 3.

By condensate pump 93, the support tie point to separator 3 and condensate water pot 92 is formd, by condensate pump 93, The connection with separator 3 is realized, the connection with condensate water pot 92 is realized, technical purpose is: for steam to be inputted Into separator 3.

In the present embodiment, rectifying column 1, Falling film heat transfer device 2, first circulation pump 21, surge tank 6, reflux pump 7, reboiler 8, it second circulation pump 81, vacuum pump 82, the first preheater 9, the second preheater 91, condensate water pot 92 and condensate pump 93 and separates Device 3, the first compressor 4 and the second compressor 5 are set as being distributed in the way of heating up again.

Second embodiment of the invention, separator 3, compressor set in the way of promoting last row again and putting vapor (steam) temperature It is coupled to each other with low-concentration ethanol recyclable device ontology.

In the present embodiment, it is promoted by way of last row puts vapor (steam) temperature according to MVR separator 3 and compressor set Couple with low-concentration ethanol recyclable device ontology.

In the present embodiment, compressor set is set as including the first compressor 4 and the second compressor 5.

In the present embodiment, low-concentration ethanol recyclable device ontology is set as also including that first circulation pumps 21, surge tank 6, reflux pump 7, second circulation pump 81, vacuum pump 82, the first preheater 9, the second preheater 91, condensate water pot 92 and condensate pump 93。

Second embodiment of the invention is based on one embodiment.

Below with reference to embodiment, the present invention is further described, following embodiment is intended to illustrate invention rather than to this Invention further limits.

A kind of low-concentration ethanol recovery method based on MVR, one of one embodiment of the invention the steps include:

Raw material in the head tank of low-concentration ethanol enters in the first preheater 9, enters back into the second preheater 91, The pre-heat treatment is carried out in one preheater 9 and the second preheater 91, the raw material that temperature is 65 DEG C -70 DEG C is obtained, passes through rectifying column 1 Material input oral area is injected into rectifying column 1, and the raw material that temperature is 65 DEG C -75 DEG C is thermally formed ethyl alcohol in rectifying column 1 and is steamed Vapour, alcohol vapour enter Falling film heat transfer device 2 by the output end oral area of rectifying column 1 and the input terminal oral area of Falling film heat transfer device 2 In, cooling processing is carried out in Falling film heat transfer device 2, keeping the temperature of Falling film heat transfer device 2 is 72-74 DEG C and Falling film heat transfer device 2 Vacuum degree is set as -0.062MPa to -0.067MPa, alcohol vapour is formed ethanol liquid, ethanol liquid passes through Falling film heat transfer The gentle input terminal oral area for rushing tank 6 of the fluid output port oral area of device 2 is injected into surge tank 6, by reflux pump 7, ethanol liquid A portion be injected into the finished pot of ethyl alcohol, wherein another part of ethanol liquid injection returning by rectifying column 1 Flow port portion is re-introduced into rectifying column 1, and the liquid and steam of Falling film heat transfer device 2 pass through the steam output end of Falling film heat transfer device 2 The first input end oral area of oral area and separator 3 is injected into separator 3, and the last row of separator 3 puts steam and passes through the first compression Machine 4 and the processing of the second compressor 5 obtain 108-110 DEG C of steam, the second input that 108-110 DEG C of steam passes through reboiler 8 Port part is injected into reboiler 8, and the saturated vapor of heat source is injected into reboiler 8 by the first input end oral area of reboiler 8 In, formed heating steam, heating steam by the first output end oral area of reboiler 8 be injected into rectifying column 1 add heat-exchange tube, The temperature for keeping the lower end of rectifying column 1 is 103-105 DEG C and the temperature of the upper end of rectifying column 1 is 78.5-80.5 DEG C, heating Steam is injected into the second preheater 91 by the second output terminal oral area of reboiler 8, rectifying column 1 plus heat-exchange tube liquid It is injected separately by second circulation pump 81 to the neutralization of the first preheater 9 and is flowed back into reboiler 8 with the liquid of reboiler 8, first The liquid of preheater 9 is discharged by waste pipe, and the liquid of the second preheater 91 is injected into condensate water pot 92, condensate water pot 92 Steam be injected into reboiler 8 by the third input terminal oral area of reboiler 8, the liquid of condensate water pot 92 passes through condensate pump 93 are injected into separator 3, and first circulation pump 21 carries out the liquid of Falling film heat transfer device 2 to recycle in Falling film heat transfer device 2, vacuum The on-condensible gas for pumping 82 pairs of reboilers 8 carries out extraction emptying.

The two of one embodiment of the invention, the steps include:

Raw material in the head tank of low-concentration ethanol enters in the first preheater 9, enters back into the second preheater 91, The pre-heat treatment is carried out in one preheater 9 and the second preheater 91, the raw material that temperature is 65 DEG C is obtained, passes through the material of rectifying column 1 Input terminal oral area is injected into rectifying column 1, and the raw material that temperature is 65 DEG C is thermally formed alcohol vapour in rectifying column 1, and ethyl alcohol steams Vapour is entered in Falling film heat transfer device 2 by the output end oral area of rectifying column 1 and the input terminal oral area of Falling film heat transfer device 2, in falling liquid film Carry out cooling processing in heat exchanger 2, the temperature for keeping Falling film heat transfer device 2 be 72 DEG C and the vacuum degree of Falling film heat transfer device 2 be set as- Alcohol vapour is formed ethanol liquid, the gentle punching of fluid output port oral area that ethanol liquid passes through Falling film heat transfer device 2 by 0.062MPa The input terminal oral area of tank 6 is injected into surge tank 6, by reflux pump 7, a portion of ethanol liquid be injected into ethyl alcohol at In product tank, wherein another part of ethanol liquid is injected and is re-introduced into rectifying column 1 by the return port portion of rectifying column 1, The liquid and steam of Falling film heat transfer device 2 pass through the steam output end oral area of Falling film heat transfer device 2 and the first input port of separator 3 Portion is injected into separator 3, and the last row of separator 3 puts steam and obtains 108 by the first compressor 4 and the processing of the second compressor 5 DEG C steam, 108 DEG C of steam is injected into reboiler 8 by the second input terminal oral area of reboiler 8, the saturated vapor of heat source It is injected into reboiler 8 by the first input end oral area of reboiler 8, forms heating steam, heating steam passes through reboiler 8 First output end oral area is injected into the heat-exchange tube that adds of rectifying column 1, and the temperature of the lower end of holding rectifying column 1 is 103 DEG C and essence The temperature for evaporating the upper end of tower 1 is 78.5 DEG C, heats steam by the second output terminal oral area of reboiler 8 and is injected into the second preheating In device 91, the liquid of rectifying column 1 plus heat-exchange tube liquid and reboiler 8 is injected separately by second circulation pump 81 to first The neutralization of preheater 9 flows back into reboiler 8, and the liquid of the first preheater 9 is discharged by waste pipe, the liquid of the second preheater 91 Body is injected into condensate water pot 92, and the steam of condensate water pot 92 is injected into reboiler 8 by the third input terminal oral area of reboiler 8 In, the liquid of condensate water pot 92 is injected into separator 3 by condensate pump 93, and first circulation pump 21 is Falling film heat transfer device 2 Liquid progress recycles in Falling film heat transfer device 2, and vacuum pump 82 carries out extraction emptying to the on-condensible gas of reboiler 8.

The three of one embodiment of the invention, the steps include:

Raw material in the head tank of low-concentration ethanol enters in the first preheater 9, enters back into the second preheater 91, The pre-heat treatment is carried out in one preheater 9 and the second preheater 91, the raw material that temperature is 70 DEG C is obtained, passes through the material of rectifying column 1 Input terminal oral area is injected into rectifying column 1, and the raw material that temperature is 75 DEG C is thermally formed alcohol vapour in rectifying column 1, and ethyl alcohol steams Vapour is entered in Falling film heat transfer device 2 by the output end oral area of rectifying column 1 and the input terminal oral area of Falling film heat transfer device 2, in falling liquid film Carry out cooling processing in heat exchanger 2, the temperature for keeping Falling film heat transfer device 2 be 74 DEG C and the vacuum degree of Falling film heat transfer device 2 be set as- Alcohol vapour is formed ethanol liquid, the gentle punching of fluid output port oral area that ethanol liquid passes through Falling film heat transfer device 2 by 0.067MPa The input terminal oral area of tank 6 is injected into surge tank 6, by reflux pump 7, a portion of ethanol liquid be injected into ethyl alcohol at In product tank, wherein another part of ethanol liquid is injected and is re-introduced into rectifying column 1 by the return port portion of rectifying column 1, The liquid and steam of Falling film heat transfer device 2 pass through the steam output end oral area of Falling film heat transfer device 2 and the first input port of separator 3 Portion is injected into separator 3, and the last row of separator 3 puts steam and obtains 110 by the first compressor 4 and the processing of the second compressor 5 DEG C steam, 110 DEG C of steam is injected into reboiler 8 by the second input terminal oral area of reboiler 8, and the saturation of heat source is steamed Vapour is injected into reboiler 8 by the first input end oral area of reboiler 8, forms heating steam, and heating steam passes through reboiler 8 The first output end oral area be injected into rectifying column 1 plus heat-exchange tube, keep the lower end of rectifying column 1 temperature be 105 DEG C and The temperature of the upper end of rectifying column 1 is 80.5 DEG C, and heating steam is injected into second in advance by the second output terminal oral area of reboiler 8 In hot device 91, the liquid of rectifying column 1 plus heat-exchange tube liquid and reboiler 8 pumps 81 by second circulation and is injected separately into the The neutralization of one preheater 9 flows back into reboiler 8, and the liquid of the first preheater 9 is discharged by waste pipe, the second preheater 91 Liquid is injected into condensate water pot 92, and the steam of condensate water pot 92 is injected by the third input terminal oral area of reboiler 8 to boil again In device 8, the liquid of condensate water pot 92 is injected into separator 3 by condensate pump 93, and first circulation pump 21 is Falling film heat transfer device 2 Liquid progress recycled in Falling film heat transfer device 2, vacuum pump 82 carries out extraction emptying to the on-condensible gas of reboiler 8.

The four of one embodiment of the invention, the steps include:

Raw material in the head tank of low-concentration ethanol enters in the first preheater 9, enters back into the second preheater 91, The pre-heat treatment is carried out in one preheater 9 and the second preheater 91, the raw material that temperature is 67.5 DEG C is obtained, passes through the object of rectifying column 1 Material input terminal oral area is injected into rectifying column 1, and the raw material that temperature is 67.5 DEG C is thermally formed alcohol vapour, second in rectifying column 1 Alcohol steam is entered in Falling film heat transfer device 2 by the output end oral area of rectifying column 1 and the input terminal oral area of Falling film heat transfer device 2, Cooling processing is carried out in Falling film heat transfer device 2, the temperature for keeping Falling film heat transfer device 2 is 73 DEG C and the vacuum degree of Falling film heat transfer device 2 is set It is set to -0.065MPa, alcohol vapour is formed ethanol liquid, ethanol liquid passes through the fluid output port oral area of Falling film heat transfer device 2 It is injected into surge tank 6 with the input terminal oral area of surge tank 6, by reflux pump 7, a portion of ethanol liquid is injected into second In the finished pot of alcohol, wherein another part of ethanol liquid is injected, rectifying is re-introduced by the return port portion of rectifying column 1 In tower 1, the liquid and steam of Falling film heat transfer device 2 are first defeated by the steam output end oral area of Falling film heat transfer device 2 and separator 3 Inbound port portion is injected into separator 3, and the last row of separator 3 is put steam and handled by the first compressor 4 and the second compressor 5 To 109 DEG C of steam, 109 DEG C of steam is injected into reboiler 8 by the second input terminal oral area of reboiler 8, and heat source is satisfied It is injected into reboiler 8 with steam by the first input end oral area of reboiler 8, forms heating steam, heating steam is by again First output end oral area of boiling device 8 is injected into the heat-exchange tube that adds of rectifying column 1, and the temperature of the lower end of holding rectifying column 1 is 104 DEG C and the temperature of upper end of rectifying column 1 be 79.5 DEG C, heating steam is injected into the by the second output terminal oral area of reboiler 8 In two preheaters 91, the liquid of rectifying column 1 plus heat-exchange tube liquid and reboiler 8 is injected separately by second circulation pump 81 It is flowed back into reboiler 8 to the neutralization of the first preheater 9, the liquid of the first preheater 9 is discharged by waste pipe, the second preheater 91 liquid is injected into condensate water pot 92, and the steam of condensate water pot 92 is injected by the third input terminal oral area of reboiler 8 In reboiler 8, the liquid of condensate water pot 92 is injected into separator 3 by condensate pump 93, and first circulation pump 21 changes falling liquid film The liquid progress of hot device 2 recycles in Falling film heat transfer device 2, and vacuum pump 82 carries out extraction emptying to the on-condensible gas of reboiler 8.

One of second embodiment of the invention is converted into the alcohol vapour generated by rectifying column 1 the drop of ethanol liquid Film heat exchanger 2 heats rectifying column 1 and keeps the temperature of the lower end of rectifying column 1 for 103-105 DEG C and the upper end of rectifying column 1 Temperature be 78.5-80.5 DEG C of reboiler 8, the separator 3 that last row puts steam is extracted from Falling film heat transfer device 2, to extracting tail It is 108-110 DEG C that discharge steam, which is heated and last row is kept to put the temperature of steam, and last row puts steam and is re-introduced into reboiler 8 In.

Second embodiment of the invention is based on one embodiment.

The two of second embodiment of the invention, are converted into the alcohol vapour generated by rectifying column 1 the drop of ethanol liquid Film heat exchanger 2 heats rectifying column 1 and keeps the temperature of the lower end of rectifying column 1 for 103 DEG C and the temperature of the upper end of rectifying column 1 Degree is 78.5 DEG C of reboiler 8, and the separator 3 that last row puts steam is extracted from Falling film heat transfer device 2, to extract last row put steam into It is 108 DEG C that row, which heats and last row is kept to put the temperature of steam, and last row is put steam and is re-introduced into reboiler 8.

The three of second embodiment of the invention, are converted into the alcohol vapour generated by rectifying column 1 the drop of ethanol liquid Film heat exchanger 2 heats rectifying column 1 and keeps the temperature of the lower end of rectifying column 1 for 105 DEG C and the temperature of the upper end of rectifying column 1 Degree is 80.5 DEG C of reboiler 8, and the separator 3 that last row puts steam is extracted from Falling film heat transfer device 2, to extract last row put steam into It is 110 DEG C that row, which heats and last row is kept to put the temperature of steam, and last row is put steam and is re-introduced into reboiler 8.

The four of second embodiment of the invention, are converted into the alcohol vapour generated by rectifying column 1 the drop of ethanol liquid Film heat exchanger 2 heats rectifying column 1 and keeps the temperature of the lower end of rectifying column 1 for 104 DEG C and the temperature of the upper end of rectifying column 1 Degree is 79.5 DEG C of reboiler 8, and the separator 3 that last row puts steam is extracted from Falling film heat transfer device 2, to extract last row put steam into It is 109 DEG C that row, which heats and last row is kept to put the temperature of steam, and last row is put steam and is re-introduced into reboiler 8.

The present invention has the following characteristics:

1, it due to devising separator 3, compressor set and low-concentration ethanol recyclable device ontology, is recycled and is filled by low-concentration ethanol It sets ontology and rectification process is carried out to the raw material of low-concentration ethanol, ethyl alcohol finished product is obtained, by separator 3 and compressor set, to essence The steam for evaporating processing heats up, and is re-used as the heating source of rectifying column 1, therefore realize single column ethanol distillation and MVR evaporation technique Matching, improving the reuse ratio of thermal energy and reduces the consumption of thermal energy.

2, due to devising the first compressor 4 and the second compressor 5, by unit of connecting, the steaming of rectification process is improved Vapour temperature rise effect.

3, pre- due to devising first circulation pump 21, surge tank 6, reflux pump 7, second circulation pump 81, vacuum pump 82, first Hot device 9, the second preheater 91, condensate water pot 92 and condensate pump 93 realize single tower distillation processing.

4, due to devising technical characteristic of the invention, in the effect of the independent and mutual set of technical characteristic, By experiments have shown that, performance indexes of the invention be existing performance indexes be at least 1.7 times, pass through assessment tool There is good market value.

It is filled there are also other with separator 3, compressor set and low-concentration ethanol recycling that promote last row again and put vapor (steam) temperature The technical characteristic for setting ontology connection is all one of the embodiment of the present invention, and each technical characteristic of embodiment described above can be with It is arbitrarily combined, to meet Patent Law, patent regulation and the requirement of guidelines for examination, no longer in above-described embodiment Each all possible combined embodiment of technical characteristic is all described.

Above-described embodiment is a kind of reality of the low-concentration ethanol recyclable device based on MVR and method provided by the present invention Existing form, other deformations of provided scheme, increase and perhaps reduce composition therein or step or incite somebody to action this according to the present invention Invention is all belonged to the scope of protection of the present invention for other technical fields close with the present invention.

Claims (10)

1. a kind of low-concentration ethanol recyclable device based on MVR, it is characterized in that: including to have to be set as joining with rectifying column (1) The Falling film heat transfer device (2) that connects and the low-concentration ethanol recyclable device ontology for being set as the reboiler (8) coupled with rectifying column (1), Be set as coupling with Falling film heat transfer device (2) and the separator (3) for extracting steam, be set as respectively with separator (3) and Reboiler (8) couples and the compressor set for promoting vapor (steam) temperature.

2. the low-concentration ethanol recyclable device according to claim 1 based on MVR, it is characterized in that: according to last row is promoted again The mode for putting vapor (steam) temperature is coupled to each other separator (3), compressor set and low-concentration ethanol recyclable device ontology.

3. the low-concentration ethanol recyclable device according to claim 2 based on MVR, it is characterized in that: being promoted according to by MVR The mode that last row puts vapor (steam) temperature couples separator (3) and compressor set with low-concentration ethanol recyclable device ontology.

4. the low-concentration ethanol recyclable device according to claim 1 based on MVR, it is characterized in that: compressor set is set as It include the first compressor (4) and the second compressor (5),

Or, low-concentration ethanol recyclable device ontology is set as also including first circulation pump (21), surge tank (6), reflux pump (7), second circulation pump (81), vacuum pump (82), the first preheater (9), the second preheater (91), condensate water pot (92) and condensation Water pump (93).

5. the low-concentration ethanol recyclable device according to claim 4 based on MVR, it is characterized in that: the original of low-concentration ethanol Batch can is set as coupling by the first preheater (9) and the second preheater (91) with the input terminal oral area of rectifying column (1), rectifying column (1) output end oral area is set as coupling by Falling film heat transfer device (2) with the finished pot of ethyl alcohol, the liquid of Falling film heat transfer device (2) Output end oral area is set as coupling with the input terminal oral area of surge tank (6) and the output end oral area of surge tank (6) is set as logical Reflux pump (7) is crossed to couple with the return port portion of rectifying column (1), the steam output end oral area of Falling film heat transfer device (2) be set as with The first input end oral area of separator (3) couples and the output port portion of separator (3) is respectively set to through the first compression Machine (4) and the second compressor (5) couple with the second input terminal oral area of reboiler (8), the second output terminal oral area of reboiler (8) It is respectively set to the heat exchange input terminal oral area with the heat exchange input terminal oral area of the first preheater (9) and the second preheater (91) Connection, the heat exchange output end oral area of the second preheater (91) is set as coupling with the input terminal oral area of condensate water pot (92), cold First output end oral area of condensate tank (92) is set as coupling with the third input terminal oral area of reboiler (8) and condensate water pot (92) second output terminal oral area is set as coupling by condensate pump (93) with the second input terminal oral area of separator (3), then The first input end oral area of boiling device (8) is set as being connected to the saturated vapor of heat source and the first output port of reboiler (8) Portion is set as coupling with the heating source of rectifying column (1), first circulation pump (21) is provided on Falling film heat transfer device (2) and again Second circulation pump (81) and vacuum pump (82) are respectively arranged in boiling device (8).

6. the low-concentration ethanol recyclable device according to claim 5 based on MVR, it is characterized in that: separator (3) is set as Gas-liquid separator is provided with first input end oral area and the second input terminal oral area and separator in the middle part of separator (3) (3) first input end oral area is set as coupling with Falling film heat transfer device (2), the second input terminal oral area of separator (3) is set as Couple with condensate pump (93), the top of separator (3) is provided with the output end oral area of output end oral area and separator (3) It is set as coupling with the first compressor (4), the bottom end of separator (3) is provided with fluid output port oral area and separator (3) Fluid output port oral area be set as with first circulation pump (21) couple,

Or, the first compressor (4) and the second compressor (5) are set as in tandem connection and the input of the first compressor (4) Port part is set as coupling with separator (3), and the output end oral area of the first compressor (4) is set as and the second compressor (5) The output end oral area of the connection of input terminal oral area and the second compressor (5) is set as coupling with reboiler (8).

7. the low-concentration ethanol recyclable device according to claim 5 based on MVR, it is characterized in that: the first preheater (9) and The material input oral area that second preheater (91) is set as heat-exchangers of the plate type and the first preheater (9) be set as with it is low dense The head tank connection of ethyl alcohol is spent, the material output end oral area of the first preheater (9) is set as the material with the second preheater (91) The connection of input terminal oral area, the material output end oral area of the second preheater (91) are set as and the material input mouth of rectifying column (1) Portion's connection, the output end oral area that the heat exchange input terminal oral area of the first preheater (9) is set as pumping (81) with second circulation couple And the heat exchange output end oral area of the first preheater (9) is set as coupling with waste pipe, and the heat of the second preheater (91) is handed over Change that input terminal oral area is set as coupling with the lower end output end oral area of reboiler (8) and the heat exchange of the second preheater (91) is defeated Outlet oral area is set as coupling with the middle part input terminal oral area of condensate water pot (92),

Or, rectifying column (1) is set as the tower-like body of cylindricality and the state of rectifying column (1) is set as air-distillation, in rectifying column (1) Middle part be provided with material input oral area and the material input oral area of rectifying column (1) is set as and the second preheater (91) Connection, is respectively arranged with the output end in output end oral area and return port portion and rectifying column (1) in the top end part of rectifying column (1) Oral area is set as coupling with Falling film heat transfer device (2), the return port portion of rectifying column (1) is set as coupling with reflux pump (7), in essence The lower end for evaporating tower (1) is respectively arranged with plus the input terminal oral area setting for adding heat-exchange tube of heat-exchange tube and rectifying column (1) To couple with reboiler (8), the output end oral area for adding heat-exchange tube of rectifying column (1) is set as and second circulation pumps (81) connection It connects,

Or, the state of Falling film heat transfer device (2) is set as negative pressure, the upper end port portion of Falling film heat transfer device (2) is set as following with first The output end oral area of ring pump (21) couples and the lower end port portion of Falling film heat transfer device (2) is set as and first circulation pumps (21) The connection of input terminal oral area, is provided with the input terminal of input terminal oral area and Falling film heat transfer device (2) in the upper end of Falling film heat transfer device (2) Oral area is set as coupling with rectifying column (1), and the bottom of Falling film heat transfer device (2) is provided with fluid output port oral area and falling liquid film changes The fluid output port oral area of hot device (2) is set as coupling with surge tank (6), and the lower end of Falling film heat transfer device (2) is provided with steam The steam output end oral area of output end oral area and Falling film heat transfer device (2) is set as coupling with separator (3),

Or, first circulation pump (21) is set as high-temperature pump and first circulation pump (21) setting is devised in the present invention, surge tank (6) it is set as cylindricality tank-like body, the upper end of surge tank (6) is provided with the input port of input terminal oral area and surge tank (6) Portion is set as coupling with Falling film heat transfer device (2), and the bottom end of surge tank (6) is provided with output end oral area and surge tank (6) Output end oral area is set as coupling with reflux pump (7),

Or, the input terminal oral area of reflux pump (7) is set as coupling with surge tank (6) and the input port part of reflux pump (7) It is not set as coupling with the finished pot of rectifying column (1) and ethyl alcohol,

Or, the state of reboiler (8) is set as normal pressure, the upper end end port part of reboiler (8) is set as pumping with second circulation (81) the lower end end port part of the connection of output end oral area and reboiler (8) is set as pumping the input terminal of (81) with second circulation Oral area connection, is respectively arranged with vacuum end oral area and third input terminal oral area and reboiler (8) in the middle part of reboiler (8) Vacuum end oral area be set as coupling with vacuum pump (82), the third input terminal oral area of reboiler (8) is set as and condensate water pot (92) couple, be respectively arranged with first input end oral area and the second input terminal oral area and reboiler in the upper end of reboiler (8) (8) first input end oral area is set as being connected to the saturated vapor of heat source, the second input terminal oral area of reboiler (8) is set as Couple with the second compressor (5), is respectively arranged with the first output end oral area and second output terminal oral area in the lower end of reboiler (8) And the first output end oral area of reboiler (8) is set as coupling with rectifying column (1), the second output terminal oral area of reboiler (8) It is set as coupling with the second preheater (91),

Or, second circulation pump (81) is set as high-temperature pump and the input port portion of second circulation pump (81) is respectively set to and essence Tower (1) and reboiler (8) connection are evaporated, the output end oral area of second circulation pump (81) is set as coupling with reboiler (8),

Or, vacuum pump (82) is arranged on reboiler (8),

Or, condensate water pot (92) is set as cylindricality tank-like body, input terminal oral area is provided with simultaneously in the middle part of condensate water pot (92) And the input terminal oral area of condensate water pot (92) is set as coupling with the second preheater (91), is arranged on the top of condensate water pot (92) There is the first output end oral area of the first output end oral area and condensate water pot (92) to be set as coupling with reboiler (8), is condensing The second output terminal oral area that the bottom end of water pot (92) is provided with second output terminal oral area and condensate water pot (92) be set as with it is cold Condensate pump (93) connection,

Or, the input terminal oral area of condensate pump (93) is set as coupling with condensate water pot (92) and the output of condensate pump (93) Port part is set as coupling with separator (3).

8. according to claim 1 to the low-concentration ethanol recyclable device described in any one of 7 based on MVR, it is characterized in that: Rectifying column (1), Falling film heat transfer device (2), first circulation pump (21), surge tank (6), reflux pump (7), reboiler (8), second circulation It pumps (81), vacuum pump (82), the first preheater (9), the second preheater (91), condensate water pot (92) and condensate pump (93) and divides It is set as being distributed in the way of heating up again from device (3), the first compressor (4) and the second compressor (5).

9. a kind of low-concentration ethanol recovery method based on MVR, it is characterized in that: the steps include:

The alcohol vapour generated by rectifying column (1) is converted into the Falling film heat transfer device (2) of ethanol liquid, rectifying column (1) is heated The temperature for keeping the lower end of rectifying column (1) is 103-105 DEG C and the temperature of the upper end of rectifying column (1) is 78.5-80.5 DEG C Reboiler (8), the separator (3) that last row puts steam is extracted from the Falling film heat transfer device (2), is added to extracting last row and putting steam Heat and keep last row put steam temperature be 108-110 DEG C, last row is put steam and is re-introduced into reboiler (8).

10. the low-concentration ethanol recovery method according to claim 9 based on MVR, it is characterized in that: the steps include:

Raw material in the head tank of low-concentration ethanol enters in the first preheater (9), enters back into in the second preheater (91), The pre-heat treatment is carried out in the first preheater (9) and the second preheater (91), is obtained the raw material that temperature is 65 DEG C -70 DEG C, is passed through The material input oral area of rectifying column (1) is injected into rectifying column (1), the raw material for being 65 DEG C -75 DEG C temperature in rectifying column (1) It is thermally formed alcohol vapour, alcohol vapour passes through the output end oral area of rectifying column (1) and the input terminal oral area of Falling film heat transfer device (2) It enters in Falling film heat transfer device (2), cooling processing is carried out in Falling film heat transfer device (2), the temperature of holding Falling film heat transfer device (2) is The vacuum degree of 72-74 DEG C and Falling film heat transfer device (2) is set as -0.062MPa to -0.067MPa, and alcohol vapour is formed ethanol Body, ethanol liquid are injected into buffering by the gentle input terminal oral area for rushing tank (6) of fluid output port oral area of Falling film heat transfer device (2) Tank (6) is injected into a portion of ethanol liquid in the finished pot of ethyl alcohol, by reflux pump (7) its of ethanol liquid Middle another part injection is re-introduced into rectifying column (1) by the return port portion of rectifying column (1), the liquid of Falling film heat transfer device (2) Body and steam are injected into point by the steam output end oral area of Falling film heat transfer device (2) and the first input end oral area of separator (3) From in device (3), the last row of separator (3) puts steam and obtains 108- by the first compressor (4) and the second compressor (5) processing 110 DEG C of steam, 108-110 DEG C of steam are injected into reboiler (8) by the second input terminal oral area of reboiler (8), heat The saturated vapor in source is injected into reboiler (8) by the first input end oral area of reboiler (8), forms heating steam, heating Steam is injected into the heat-exchange tube that adds of rectifying column (1) by the first output end oral area of reboiler (8), holding rectifying column (1) The temperature of lower end is 103-105 DEG C and the temperature of the upper end of rectifying column (1) is 78.5-80.5 DEG C, and heating steam is by again The second output terminal oral area of boiling device (8) is injected into the second preheater (91), rectifying column (1) plus heat-exchange tube liquid and again The liquid for boiling device (8) is injected separately into the first preheater (9) to neutralize by second circulation pump (81) to be flowed back into reboiler (8), The liquid of first preheater (9) is discharged by waste pipe, and the liquid of the second preheater (91) is injected into condensate water pot (92), The steam of condensate water pot (92) is injected into reboiler (8) by the third input terminal oral area of reboiler (8), condensate water pot (92) Liquid be injected into separator (3) by condensate pump (93), first circulation pump (21) the liquid of Falling film heat transfer device (2) into Row circulation, vacuum pump (82) in Falling film heat transfer device (2) carry out extraction emptying to the on-condensible gas of reboiler (8).