CN105000612B - Mechanical vapor recompression system of concentrated organic waste water and method - Google Patents

Mechanical vapor recompression system of concentrated organic waste water and method Download PDF

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CN105000612B
CN105000612B CN201510434691.0A CN201510434691A CN105000612B CN 105000612 B CN105000612 B CN 105000612B CN 201510434691 A CN201510434691 A CN 201510434691A CN 105000612 B CN105000612 B CN 105000612B
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concentration
steam
organic wastewater
evaporimeter
gas
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CN105000612A (en
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罗晓
梅拥军
刘雪奇
韦勇强
周洪
王航
管明
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Chengdu Newave Aerochemical Co., Ltd.
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CHENGDU NEWAVE AEROCHEMICAL Co Ltd
Second Research Institute of CAAC
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Abstract

The invention discloses a mechanical vapor recompression system of concentrated organic waste water and an application method of the mechanical vapor recompression system, and relates to the technical field of energy conservation and emission reduction. A second-stage evaporating unit is added outside a heat exchange pipe of an existing MVR evaporator, secondary heat exchange is conducted on the evaporator through an outer heating source, and therefore the ethanol concentration of a concentrated solution concentrated through MVR is further improved, the energy utilization efficiency is improved, and the waste water volume and energy consumption in the reconcentration process are lowered. Due to an added rectifying tower and an added condensation device, the utilization efficiency of the outer heating source is fully improved, the ethanol concentration in vapor can be reduced, and convenience is provided for making the waste water meet the emission requirements. The procedures are simple, operation is convenient, and a cooling water system can be omitted.

Description

A kind of function of mechanical steam recompression system and method for concentration organic wastewater
Technical field
The invention belongs to chemical field, and in particular to a kind of system of function of mechanical steam recompression concentrating low-concentration organic wastewater and Method.
Background technology
Containing organic matters such as substantial amounts of carbohydrate, fat, albumen, celluloses in organic wastewater, if directly discharged, Oxygen in water can be caused to reduce, affect fish and other hydrobiological growths.Water soluble organic substance, such as low-molecular-weight have Machine alcohol, particularly dihydroxylic alcohols, as good freezing point depressing agent the deicing of the vehicles and equipment, anti-icing, antifreeze is usually used in, can The organic containing alcohol waste water of substantial amounts of low concentration can be produced at short notice, and the average COD of this kind of waste water is more than 20000mg/L.Contain There is the organic wastewater of low-concentration organic, if directly discharge can serious harm ecological environment.
In order to protect existing ecological environment, both at home and abroad as where manage such low-concentration organic waste water spy carried out it is substantial amounts of Research, mainly there is now biochemical process and concentration method.Due to waste water COD fluctuation greatly, it is larger to the activity influence of aerobic bacteria, so as to Constrain the application of biochemical process.And conventional physically or chemically means improve the biodegradability of difficult biochemistry organic wastewater, often need Want a large amount of reagents to add, or need the input of big energy, the reaction time is longer, and effect is not notable, cause COD to cut down difficult, The present situation that water environment goes from bad to worse.By being evaporated concentration to low-concentration organic waste water, most of water evaporation simultaneously can be realized The concentration method that utility is reclaimed, is a kind of effective method for processing organic wastewater.
The evaporating concentrating method of traditional multi-effect distillation can realize the recovery of organic matter, but use effect due to there is steam The deficiency such as rate is low and operating cost is high, can consume substantial amounts of energy consumption when processing low-concentration organic waste water, and technological process is complicated.
Function of mechanical steam recompression is the Low Temperature Steam that evaporimeter is produced to be compressed using mechanically operated compressor do Work(, making the temperature raising of steam becomes high-temperature steam, again returns to former evaporimeter, makes full use of the latent heat of high-temperature steam, replaces External steam, so as to reach energy-conservation purpose, is now widely used in the industries such as process, the desalinization of brine waste as thermal source.
Energy consumption in order to save evaporation process, can be organic to low concentration using function of mechanical steam recompression (MVR) system Waste water is evaporated concentration, to improve waste water in organic concentration.But due to the waste water of containing water-soluble organic matter, the water for containing Soluble organism can cause the waste water solution elevation of boiling point, and boiling point differs greatly after concentration, carry out from energy consumption and cost of investment comprehensive Close and consider, such as organic wastewater containing alcohols, using function of mechanical steam recompression (MVR) system to low concentration containing alcohol waste water Be evaporated concentration, to improve waste water in determining alcohol.But because boiling point differs greatly after containing alcohol Waste water concentrating, from energy consumption and throwing Money cost is considered, and single MVR systems can only obtain the alcohol solution that determining alcohol is about 60%, and due to binary Alcohol may together be taken out of in evaporation process by vapor so that the alcohol containing higher concentration in the condensed water that system is produced, nothing Method reaches emission request.
CN 203483884U are related to a kind of function of mechanical steam recompression with the combined caprolactam aqueous solution of multiple-effect evaporation Enrichment facility, is made up of MVR evaporations and multiple-effect evaporation.The device takes MVR technologies to remove a large amount of water in solution, by interior acyl Amine is carried out being concentrated into after finite concentration and enters back into two effects or triple effect evaporation technique realizes concentrating again for caprolactam, is steamed using multiple-effect The indirect steam that a upper effect is produced during sending out adds vapours as next effect, improves efficiency of utilization, has saved energy consumption, Reduce the consumption of steam consumption and cooling water.Although the device can improve the concentration of caprolactam, in MVR systems, The concentration of caprolactam can only achieve 50%~55%, and follow-up multiple-effect evaporation still needs greater energy consumption.
CN 103224260A are related to a kind of concentration using MVR and add rectification method to administer and reclaim low concentration DMAc, DMF waste water Method.First waste water is recycled into concentration tower after Mechanical Vapor Compression is to the secondary steam high pressure for concentrating tower top dense The evaporimeter of contracting tower is heated to the tower reactor of concentration tower, so as to DMAc, DMF that waste water is realized in concentration tower are concentrated.The party Low concentration DMAc, DMF wastewater degradation is difficult, solvent is lost in although solving for method, reclaims the difficult problems such as energy consumption is big, realizes the zero of waste water Discharge and the recovery of raw materials for production, but DMAc, the DMF in waste water can only be concentrated into 30~50% after MVR is processed, follow-up rectifying Operation also needs to the water of evaporation 50%~70%, and energy consumption is higher needed for distillation operation.
CN 203577339U provide a kind of function of mechanical steam recompression type evaporation concentration device, including the steaming for flash distillation Tank, vapour compression machine and heat exchanger are sent out, the steam (vapor) outlet of evaporator is connected with the steam inlet of compressor by pipeline, vapour pressure The steam (vapor) outlet of contracting machine and the steam inlet of First Heat Exchanger are connected by pipeline.In the device, because First Heat Exchanger is in The low level of evaporator, the pressure for the treatment of fluid is more than the pressure for the treatment of fluid in evaporator in First Heat Exchanger, and treatment fluid is changed from first Hot device is transported to pressure after evaporator and diminishes, and evaporating temperature is reduced, so as to realize flash distillation.Although the device is realized using power supply The concentration of waste water, does not require the use of the heat transfer mediums such as freon, reduces cost, but mainly for the treatment of salt-containing organic wastewater, it is right In the organic wastewater effect on driving birds is not good that process organic matter is easily taken out of with steam.
Although function of mechanical steam recompression system has the advantages that reducing energy consumption, reduces fresh steam consumption, its operating cost It is closely related with the boiling point of material with energy consumption, especially in concentrating low-concentration containing alcohol waste water, due to containing alcohol waste water boiling point rise compared with Height, temperature difference loss is big, can cause the evaporation and concentration of MVR systems than reducing, the determining alcohol being unfavorable in raising system concentrate.Together When, because during evaporation containing alcohol wastewater from chemical industry, the dihydroxylic alcohols in waste water is easily taken out of by water vapour, makes the condensed water after evaporation In contain more dihydroxylic alcohols, therefore emission request cannot be met.Base of the present invention in the original advantage for retaining existing MVR systems On plinth, the organic concentration in concentrate is further increased, the concentration of condensation Organic substance in water is greatly reduced, while can also profit It is system additional heat with other thermals source, advantageously reduces energy consumption.
The content of the invention
Present invention aim at the system and method that a kind of employing mechanical vapor recompression technology concentrates organic wastewater is provided, The system can both effectively improve the organic concentration in processed waste water, reduce the energy consumption of follow-up distillation operation, can drop again Organic concentration in the condensed water that low system is produced.The present invention is produced in waste water evaporation process using MVR evaporation processes Indirect steam and external heat source carry out heating evaporation to organic wastewater, improve evaporation capacity and the organic concentration in concentrate, drop The energy consumption of low re-enrichment process, improves waste water treatment efficiency.
For achieving the above object, the technical solution used in the present invention is as follows:
It is a kind of concentration organic wastewater function of mechanical steam recompression system, including evaporimeter 4, gas-liquid separator 7, rectifying column 8, Vapour compression machine 10, waterwater entrance 1, elevator pump A2, elevator pump B11, discharging by pump 12, heat exchanger 3, the evaporimeter 4 by Two independent one-level evaporation elements 5 and dual evaporation unit 6 are constituted, the outlet of the one-level evaporation element and vapour compression machine Adjacent by pipeline, dual evaporation unit connects external thermal source;The gas-liquid separator top is connected with rectifying column 8, rectifying column 8 Top is provided with condensing unit 9, and condensing unit is connected respectively with rectifying column top and vapour compression machine;The gas-liquid separator bottom Portion is connected respectively with elevator pump B11 and discharging by pump 12, and discharging is by pump other end connection concentration liquid storage tank 13, elevator pump The B11 other ends connect one-level evaporation element entrance;Waterwater entrance 1 is connected by elevator pump A2 with heat exchanger one end, and heat exchanger is another One end connects one-level evaporation element entrance;The dual evaporation unit is connected with gas-liquid separator, one-level evaporation element with heat exchange Device is connected.
Further, heat exchanger can be shell-and-tube in a kind of function of mechanical steam recompression system of concentration organic wastewater Heat exchanger, plate type heat exchanger, coil exchanger, preferably shell-and-tube heat exchanger.
Further, it is described it is a kind of concentration organic wastewater function of mechanical steam recompression system in dual evaporation unit tube side It is connection, shell side is independent.
Present invention also offers a kind of function of mechanical steam recompression systematic difference method of concentration organic wastewater, including it is as follows Step:
S1, by initial organic wastewater in heat exchanger 3 with after evaporimeter one-level evaporation element 5 exchanges heat produce high temperature Condensed water is exchanged heat, and improves the wastewater temperature that initial organic wastewater is entered before evaporimeter, and high-temperature condensation water becomes after being exchanged heat Into a condensed water;
Organic wastewater after S2, the heat exchange of step S1 high-temperature condensation water has with the part from gas-liquid separator containing high concentration The concentrate of machine thing is entered in the evaporimeter comprising two evaporation elements from the top of evaporimeter 4, first in one-level evaporation element 5 The indirect steam heat exchange produced with vapour compression machine 10, then exchanged heat with external thermal source in dual evaporation unit 6, after heat exchange Gas-liquid mixture carry out gas-liquid separation in gas-liquid separator 7, isolate the primary steam containing partial organic substances and contain There is the concentrate of high-enriched organics, partly the concentrate containing high-enriched organics is back to evaporimeter top and pending liquid Evaporimeter is entered after mixing, the remaining concentrate containing high-enriched organics is entered in concentration liquid storage tank 13;
The primary steam that S3, gas-liquid separator separates go out is condensed the partial condensation of device 9 Jing after rectifying column 8 in rectifying tower top Backflow, the partial organic substances in primary steam are changed into liquid and return in gas-liquid separator, and remaining primary steam enters steam Compressor 10, indirect steam is become Jing after Mechanical Vapor Compression acting heats up, and indirect steam returns to the one-level of evaporimeter and steams Bill unit becomes high-temperature condensation water after exchanging heat to the initial organic wastewater into evaporimeter, high-temperature condensation water is organic with initial Waste water becomes a condensed water after being exchanged heat.
Further, initial organic wastewater is entered heat exchanger by elevator pump A2 in S1;Partly have containing high concentration in S3 The concentrate of machine thing is back to evaporimeter top by elevator pump B11.
Further, the medium of the external thermal source with compressed by vapour compression machine after steam will not mix in evaporimeter Close;After organic matter in the primary steam is separated in rectifying column, steam is distillated the condensing unit partial condensation of tower top Backflow, after the organic concentration in primary steam is reduced, into vapour compression machine.
Further, condensing unit includes condenser, or by cooling water, pending organic wastewater or other Low Temperature Liquids Body, takes away heat in primary steam, allows part primary steam to be changed into liquid, in returning to rectifying column.
Further, condensing unit is by way of to the pending organic wastewater of spread in the primary steam at the top of rectifying column To condense primary steam.
Further, the tube side of dual evaporation unit is connection, and shell side is independent, and organic wastewater is carried out into tube side Evaporation, indirect steam and external thermal source respectively enter thermal source when shell side evaporates as waste water.
Further, what described external heat source was provided in dual evaporation unit adds the temperature of thermal medium, than entering two The wastewater temperature of level evaporation element is high more than 1 DEG C.
Further, temperature described plus that thermal medium is produced is preferably higher by 2 than the wastewater temperature into dual evaporation unit It is~12 DEG C, more preferably high 5~10 DEG C.
Further, water soluble organic substance contained in described organic wastewater can cause its aqueous solution elevation of boiling point.
Further, water soluble organic substance contained in described initial organic wastewater including but not limited to ethylene glycol, Propane diols, the water-soluble alcohols material of diethylene glycol (DEG) class, benzamide type, alcamines material.
Further, the concentration of described initial organic waste Organic substance in water is 1~20%, preferably 5~15%.
Further, the concentration of organic matter is 45%~85% in the concentrate containing high-enriched organics, preferably For 55~75%.
The present invention has superiority as described below:
1st, present device is compact, and floor space is little, and flow process is simple, easy to operate.
2nd, the present invention is provided with dual evaporation unit in evaporimeter, except being produced using MVR in one-level evaporation element Indirect steam latent heat beyond, external thermal source also continues to heat low-concentration organic waste water in dual evaporation unit, makes Organic concentration in the concentrate produced after waste water evaporation brings up to 60~75% from 40~50%, reduces and subsequently concentrates again The wastewater flow rate and energy consumption of process;By arranging dual evaporation unit in MVR evaporimeters, it is possible to use the waste heat of other channels is System additional heat, is conducive to saving energy consumption.
3rd, the present invention increased rectifying section and condensing unit on existing MVR gas-liquid separators, reduce the generation of MVR systems Condensed water in organic concentration.
4th, the present invention can also be condensed by adding initial organic wastewater at the top of rectifying section to primary steam, not only be dropped Determining alcohol in low primary steam, improves waste water treatment efficiency, and need not consume cooling water, advantageously reduces energy consumption.
Description of the drawings
Fig. 1 is the process chart of the present invention.
In figure:1:Waterwater entrance;2nd, elevator pump A;3rd, heat exchanger;4th, evaporimeter;5th, one-level evaporation element;6th, dual evaporation Unit;7th, gas-liquid separator;8th, rectifying column 9, condensing unit;10th, vapour compression machine;11st, elevator pump B;12nd, discharging passes through pump; 13rd, liquid storage tank is concentrated.
Specific embodiment
To better illustrate the present invention, the present invention can be explained in more detail by the following examples.The present invention is not It is confined to the following examples.
A kind of function of mechanical steam recompression system of the concentrating low-concentration wastewater from chemical industry with reference to described in accompanying drawing 1,
It is a kind of concentration organic wastewater function of mechanical steam recompression system, including evaporimeter 4, gas-liquid separator 7, rectifying column 8, Vapour compression machine 10, waterwater entrance 1, elevator pump A2, elevator pump B11, discharging by pump 12, heat exchanger 3, the evaporimeter 4 by Two independent one-level evaporation elements 5 and dual evaporation unit 6 are constituted, the outlet of the one-level evaporation element and vapour compression machine Adjacent by pipeline, dual evaporation unit connects external thermal source;The gas-liquid separator top is connected with rectifying column 8, rectifying column 8 Top is provided with condensing unit 9, and condensing unit is connected respectively with rectifying column top and vapour compression machine;The gas-liquid separator bottom Portion is connected respectively with elevator pump B11 and discharging by pump 12, and discharging is by pump other end connection concentration liquid storage tank 13, elevator pump The B11 other ends connect one-level evaporation element entrance;Waterwater entrance 1 is connected by elevator pump A2 with heat exchanger one end, and heat exchanger is another One end connects one-level evaporation element entrance;The dual evaporation unit is connected with gas-liquid separator, one-level evaporation element with heat exchange Device is connected, and initial organic wastewater enters heat exchanger by elevator pump A2;Concentrate of the part containing high-enriched organics is by carrying Rise pump B11 and be back to evaporimeter top.
Further, heat exchanger described in Fig. 1 can be shell-and-tube heat exchanger, plate type heat exchanger, coil exchanger, it is excellent Elect shell-and-tube heat exchanger as.
Further, the tube side of dual evaporation unit described in Fig. 1 is connection, and shell side is independent, and organic wastewater enters Enter tube side to be evaporated, indirect steam and external thermal source respectively enter thermal source when shell side evaporates as waste water.
Further, the medium of the external thermal source with compressed by vapour compression machine after steam will not mix in evaporimeter Close;After organic matter in the primary steam is separated in rectifying column, steam is distillated the condensing unit partial condensation of tower top Backflow, after the organic concentration in primary steam is reduced, into vapour compression machine.
Further, condensing unit can include condenser, it is also possible to by cooling water, pending organic wastewater or other Cryogenic liquid, takes away heat in primary steam, allows part primary steam to be changed into liquid, in returning to rectifying column;Can also pass through The mode of the pending organic wastewater of spread is condensing primary steam in the primary steam at the top of rectifying column.
A kind of function of mechanical steam recompression system of the concentrating low-concentration wastewater from chemical industry with reference to described in accompanying drawing 1, methods described exists Comprise the steps of when processing low concentration propane diols waste water:
The first step, enters the boosted pump A2 of pending propane diols waste water that concentration is 5% heat exchanger 3 and high temperature is cold first Solidifying water is exchanged heat;
Second step, the waste water after heat exchange and the concentration waste water containing high concentration propane diols from the part of gas-liquid separator 7 It is secondary with what vapour compression machine 10 was produced in one-level evaporation element 5 after mixing in the one-level evaporation element 5 of evaporimeter 4 Evaporate after steam heat-exchanging, produce PG concentration and be about 30~60% gas and liquid mixtures, gas and liquid mixture is in dual evaporation unit 6 In exchange heat the concentration of laggard step evaporation with external thermal source, the gas-liquid mixture produced after evaporation enters promoting the circulation of qi into gas-liquid separator 7 Liquid is separated, and isolates the concentrate that PG concentration is 45%~80% and the primary steam that PG concentration is 1%~13%, Partial concentration liquid is back to after evaporimeter top mixes with pending liquid by elevator pump B11 and enters evaporimeter, remaining concentrate Entered in concentration liquid storage tank 13 by pump 12 by discharging;
3rd step, PG concentration is that 1%~13% primary steam Jing rectifying columns 8 are separated and condensing unit 9 is condensed back After stream, the most of propane diols in steam is changed into liquid and returns in gas-liquid separator, and propane diols is dense in remaining primary steam Degree can be reduced to 1%, into vapour compression machine 10, Jing after Mechanical Vapor Compression acting heats up indirect steam, secondary steaming be become Vapour returns to the one-level evaporation element 4 pairs of evaporimeter and exchanges heat into the propane diols waste water in evaporimeter, evaporates waste water, and two Secondary steam becomes high-temperature condensation water, and high-temperature condensation water carries out becoming once to condense after heat exchange with initial pending propane diols waste water Water.
A kind of function of mechanical steam recompression system of the concentrating low-concentration wastewater from chemical industry with reference to described in accompanying drawing 1, methods described exists Comprise the steps of when processing low concentration diethylene glycol (DEG) waste water:
The first step, enters heat exchanger 3 and high temperature by the boosted pump A2 of pending diethylene glycol (DEG) waste water that concentration is 15% first Condensed water is exchanged heat;
Second step, the waste water after heat exchange and the concentration waste water containing high concentration diethylene glycol (DEG) from the part of gas-liquid separator 7 It is secondary with what vapour compression machine 10 was produced in one-level evaporation element 5 after mixing in the one-level evaporation element 5 of evaporimeter 4 Evaporate after steam heat-exchanging, produce diethylene glycol (DEG) concentration and be about 45%-55% gas and liquid mixtures, gas and liquid mixture is in dual evaporation unit With the laggard step evaporation concentration of external thermal source heat exchange in 6, the gas-liquid mixture produced after evaporation enters promoting the circulation of qi into gas-liquid separator 7 Liquid is separated, and isolates the concentrate that diethylene glycol (DEG) concentration is 65%~80% and the primary steam that diethylene glycol (DEG) concentration is 5%~13%, Partial concentration liquid is back to after evaporimeter top mixes with pending liquid by elevator pump B11 and enters evaporimeter, remaining concentrate Entered in concentration liquid storage tank 13 by pump 12 by discharging;
3rd step, diethylene glycol (DEG) concentration is that 5%~13% primary steam Jing rectifying columns 8 are separated and condensing unit 9 is condensed back After stream, the most of diethylene glycol (DEG) in steam is changed into liquid and returns in gas-liquid separator, and diethylene glycol (DEG) is dense in remaining primary steam Degree can be reduced to 1%, into vapour compression machine 10, Jing after Mechanical Vapor Compression acting heats up indirect steam, secondary steaming be become Vapour returns to the one-level evaporation element 4 pairs of evaporimeter and exchanges heat into the diethylene glycol (DEG) waste water in evaporimeter, evaporates waste water, and two Secondary steam becomes high-temperature condensation water, and high-temperature condensation water carries out becoming once to condense after heat exchange with initial pending diethylene glycol (DEG) waste water Water.
A kind of function of mechanical steam recompression system of the concentrating low-concentration wastewater from chemical industry with reference to described in accompanying drawing 1, methods described exists Comprise the steps of when processing low concentration Glycol Wastewater:
The first step, enters heat exchanger 3 and high temperature by the boosted pump A2 of pending Glycol Wastewater that concentration is 20% first Condensed water is exchanged heat;
Second step, the waste water after heat exchange and the concentration waste water containing high concentration ethylene glycol from the part of gas-liquid separator 7 It is secondary with what vapour compression machine 10 was produced in one-level evaporation element 5 after mixing in the one-level evaporation element 5 of evaporimeter 4 Evaporate after steam heat-exchanging, produce glycol concentration and be about 40%-60% gas and liquid mixtures, gas and liquid mixture is in dual evaporation unit With the laggard step evaporation concentration of external thermal source heat exchange in 6, the gas-liquid mixture produced after evaporation enters promoting the circulation of qi into gas-liquid separator 7 Liquid is separated, and isolates the concentrate that glycol concentration is 55%~75% and the primary steam that glycol concentration is 4%~10%, Partial concentration liquid is back to after evaporimeter top mixes with pending liquid by elevator pump B11 and enters evaporimeter, remaining concentrate Entered in concentration liquid storage tank 13 by pump 12 by discharging;
3rd step, glycol concentration is that 4%~10% primary steam Jing rectifying columns 8 are separated and condensing unit 9 is condensed back After stream, the most of ethylene glycol in steam is changed into liquid and returns in gas-liquid separator, and ethylene glycol is dense in remaining primary steam Degree can be reduced to 1%, into vapour compression machine 10, Jing after Mechanical Vapor Compression acting heats up indirect steam, secondary steaming be become Vapour returns to the one-level evaporation element 4 pairs of evaporimeter and exchanges heat into the Glycol Wastewater in evaporimeter, evaporates waste water, and two Secondary steam becomes high-temperature condensation water, and high-temperature condensation water carries out becoming once to condense after heat exchange with initial pending Glycol Wastewater Water.
Part not in the detailed description of the invention is same as the prior art or can be realized using prior art.
Patent of the present invention is not limited to above-mentioned disclosed embodiment, and all belong to the embodiment in this spirit and scope All changes and improvement are within protection scope of the present invention.

Claims (13)

1. it is a kind of concentration organic wastewater function of mechanical steam recompression systematic difference method, it is characterised in that:The concentration is organic The function of mechanical steam recompression system of waste water include evaporimeter (4), gas-liquid separator (7), rectifying column (8), vapour compression machine (10), , by pump (12), heat exchanger (3), the evaporimeter (4) is by two for waterwater entrance (1), elevator pump A (2), elevator pump B (11), discharging Individual independent one-level evaporation element (5) and dual evaporation unit (6) are constituted, and the one-level evaporation element goes out with vapour compression machine Mouth is connected by pipeline, and dual evaporation unit connects external thermal source;The gas-liquid separator top is connected with rectifying column (8), essence Evaporate tower (8) top and be provided with condensing unit (9), condensing unit is connected respectively with rectifying column top and vapour compression machine;The gas Liquid/gas separator bottom is connected respectively with elevator pump B (11) and discharging by pump, and discharging is by pump other end connection concentration liquid storage tank (13), elevator pump B (11) other end connection one-level evaporation element entrance;Waterwater entrance (1) is by elevator pump A (2) and heat exchanger One end is connected, heat exchanger other end connection one-level evaporation element entrance;The dual evaporation unit is connected with gas-liquid separator, and one Level evaporation element is connected with heat exchanger;
The application process comprises the steps:
S1, by initial organic wastewater in heat exchanger (3) with through evaporimeter one-level evaporation element (5) heat exchange after produce high temperature Condensed water is exchanged heat, and improves the wastewater temperature that initial organic wastewater is entered before evaporimeter, and high-temperature condensation water becomes after being exchanged heat Into a condensed water;
S2, step S1 high-temperature condensation water heat exchange after organic wastewater with contain high-enriched organics from the part of gas-liquid separator Concentrate enter in the evaporimeter comprising two evaporation elements from evaporimeter (4) top, first in one-level evaporation element (5) The indirect steam heat exchange produced with vapour compression machine (10), then exchanged heat with external thermal source in dual evaporation unit (6), change Gas-liquid mixture after heat is entered in gas-liquid separator (7) and carries out gas-liquid separation, isolates the once steaming containing partial organic substances Vapour and the concentrate containing high-enriched organics, partly the concentrate containing high-enriched organics be back to evaporimeter top and treat Evaporimeter is entered after treatment fluid mixing, the remaining concentrate containing high-enriched organics is entered in concentration liquid storage tank (13);
The primary steam that S3, gas-liquid separator separates go out is condensed device (9) partial condensation Jing after rectifying column (8) in rectifying tower top Backflow, the partial organic substances in primary steam are changed into liquid and return in gas-liquid separator, and remaining primary steam enters steam Compressor (10), Jing after Mechanical Vapor Compression acting heats up indirect steam is become, and indirect steam returns to the one-level of evaporimeter Evaporation element becomes high-temperature condensation water after exchanging heat to the initial organic wastewater into evaporimeter, high-temperature condensation water has with initially Machine waste water becomes a condensed water after being exchanged heat.
2. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 1, its feature It is:The heat exchanger is shell-and-tube heat exchanger, plate type heat exchanger or coil exchanger.
3. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 1, its feature It is:Initial organic wastewater enters heat exchanger by elevator pump A (2) in S1;Concentration of the part containing high-enriched organics in S3 Liquid is back to evaporimeter top by elevator pump B (11).
4. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 1, its feature It is:The medium of the external thermal source with compressed by vapour compression machine after steam will not mix in evaporimeter;It is described once After organic matter in steam is separated in rectifying column, steam be distillated tower top condensing unit partial condensation backflow, once steam After organic concentration in vapour is reduced, into vapour compression machine.
5. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 4, its feature It is:Condensing unit includes condenser, or by cooling water, pending organic wastewater or other cryogenic liquids, takes away and once steam Heat in vapour, allows part primary steam to be changed into liquid, in returning to rectifying column.
6. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 4, its feature It is:Condensing unit to condense by way of the pending organic wastewater of spread in the primary steam at the top of rectifying column once steaming Vapour.
7. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 1, its feature It is:The tube side of dual evaporation unit is connection, and shell side is independent, and organic wastewater is evaporated into tube side, secondary steaming Vapour and external thermal source respectively enter thermal source when shell side evaporates as waste water.
8. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 7, its feature It is:The temperature that described external thermal source is provided in dual evaporation unit plus thermal medium is produced, than into dual evaporation list The wastewater temperature of unit is high more than 1 DEG C.
9. the function of mechanical steam recompression systematic difference method of a kind of concentration organic wastewater as claimed in claim 8, its feature It is:The temperature that described plus thermal medium is produced is higher 2~12 DEG C than the wastewater temperature into dual evaporation unit.
10. the function of mechanical steam recompression systematic difference side of a kind of concentration organic wastewater as described in one of claim 1~9 Method, it is characterised in that:Contained water soluble organic substance can cause its aqueous solution elevation of boiling point in described initial organic wastewater.
A kind of 11. function of mechanical steam recompression systematic difference methods of concentration organic wastewater as claimed in claim 10, it is special Levy and be:Contained water soluble organic substance is including but not limited to ethylene glycol, propane diols, second two in described initial organic wastewater The water-soluble alcohols material of alcohols, benzamide type, alcamines material.
A kind of function of mechanical steam recompression systematic difference side of the 12. concentration organic wastewaters as described in one of claim 1~9 Method, it is characterised in that:The concentration of described initial organic waste Organic substance in water is 1~20%.
A kind of 13. function of mechanical steam recompression systematic difference methods of concentration organic wastewater as claimed in claim 12, it is special Levy and be:The concentration of organic matter is 45%~85% in the concentrate containing high-enriched organics.
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