CN206508573U - A kind of function of mechanical steam recompression evaporation and crystallization system of high-salt wastewater - Google Patents

A kind of function of mechanical steam recompression evaporation and crystallization system of high-salt wastewater Download PDF

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Publication number
CN206508573U
CN206508573U CN201720181674.5U CN201720181674U CN206508573U CN 206508573 U CN206508573 U CN 206508573U CN 201720181674 U CN201720181674 U CN 201720181674U CN 206508573 U CN206508573 U CN 206508573U
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outlet
steam
gas
liquid
forced
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姜伟立
陆嘉昂
公彦猛
常闻捷
刘树洋
周海云
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CHANGZHOU ZHONGYUAN ENGINEERING TECHNOLOGY Co.,Ltd.
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Jiangsu Provincial Academy of Environmental Science
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Abstract

The utility model discloses a kind of function of mechanical steam recompression evaporation and crystallization system of high-salt wastewater, including head tank, the first preheater, the second preheater, MVR evaporators, gas-liquid separator, compressor, first circulation pump, condensate drum, forced-circulation evaporator, second circulation pump, crystallizer, centrifuge and steam generator.By reasonably designing and connecting between these equipment, making full use of for the indirect steam in the function of mechanical steam recompression evaporative crystallization technique of high-salt wastewater is realized, with cost is low, continuity is good, good energy-conserving effect, the high advantage of crystal salt quality.

Description

A kind of function of mechanical steam recompression evaporation and crystallization system of high-salt wastewater
Technical field
The utility model is related to wastewater processing technology, more particularly to a kind of evaporation of the function of mechanical steam recompression of high-salt wastewater Crystal system and method.
Background technology
High-salt wastewater is except containing organic contamination beyond the region of objective existence, also containing substantial amounts of inorganic salts, such as Cl-、SO4 2-、Na+、Ca2+Deng. Handled using conventional biologic treating technique during high-salt wastewater, generally require and such waste water is diluted, can caused greatly Water resource waste.And multiple-effect evaporation technique is used, not only consume substantial amounts of steam, it is also desirable to consume substantial amounts of cooling water to two Secondary steam is cooled down, and a large amount of latent heat of so low-grade indirect steam are wasted, and also increase cooling water Expense.
Function of mechanical steam recompression (Mechanical Vapor Recompression, MVR) technology, is to steam both at home and abroad at present The most advanced technology most saved in hair field.Its principle be the indirect steam that will be produced in evaporation process through overcompression, make its temperature, Pressure rises, and enthalpy increase, the steam so after overcompression can be directly used as the heating source of material.It is enhanced heat energy Indirect steam returns to vaporization chamber and heated, to reach the potential for recycling indirect steam, outside raw so as to not need Steam, the purpose of evaporation and concentration is realized by evaporator self-loopa.
It is general although having been disclosed for many continuous evaporative crystallization systems using mechanical vapor recompression technology now It is used for the heat supply of evaporator all over only vapour compression machine, and does not often have heat supply to crystalline portion, this is easily caused crystallization effect It is bad, the problems such as crystal grain is too small.Publication No. CN103007553A patent provides a kind of function of mechanical steam recompression continuous steaming Crystal system and method are sent out, the process employs two Mechanical Vapor Compressions, respectively to the secondary steaming of evaporator and crystallizer Vapour is compressed, but two Mechanical Vapor Compression equipment costs are high, complex process.In addition, being pressed again using mechanical vapour at present The processing method generally existing operating cost that contracting technology carries out high-salt wastewater evaporative crystallization is high, the low defect of crystal salt quality.
Utility model content
The purpose of this utility model is a kind of with low cost, process stabilizing of offer, beneficial to consecutive production, and crystallizes The function of mechanical steam recompression evaporation and crystallization system of the high high-salt wastewater of salt quality.
A kind of function of mechanical steam recompression evaporation and crystallization system of high-salt wastewater described in the utility model, it is characterised in that Including head tank, the first preheater, the second preheater, MVR evaporators, gas-liquid separator, compressor, first circulation pump, condensation Flow container, forced-circulation evaporator, second circulation pump, crystallizer, centrifuge and steam generator;
The head tank, the first preheater, the second preheater and MVR evaporators are sequentially connected by pipeline;
The entrance of the gas-liquid mixture outlet connection gas-liquid separator of the MVR evaporators, the concentrate of MVR evaporators goes out The concentrated solution outlet of mouth and gas-liquid separator is connected by threeway with the entrance of first circulation pump, and the outlet of first circulation pump passes through Threeway connects the concentrate import of MVR evaporators and the concentrate import of forced-circulation evaporator respectively;
The concentrated solution outlet of the forced-circulation evaporator connects the entrance of crystallizer, the mother liquor outlet connection of crystallizer the The entrance of two circulating pumps, the concentrate import of the outlet connection forced-circulation evaporator of second circulation pump;The magma of crystallizer goes out The entrance of mouth connection centrifuge, the mother liquor outlet of centrifuge is connected to the concentrate import of forced-circulation evaporator;
The steam (vapor) outlet of the gas-liquid separator and the steam (vapor) outlet of crystallizer connect the entrance of compressor, compressor respectively Outlet respectively connection MVR evaporators and forced-circulation evaporator steam inlet;
The condensate outlet of the MVR evaporators and the condensate outlet of forced-circulation evaporator pass through threeway and condensate liquid Not solidifying steam in the entrance connection of tank, condensate drum, which enters after the first preheater, discharges, and the condensate liquid in condensate drum enters Discharged after second preheater;
The steam inlet of the MVR evaporators is also associated with steam generator.
Above-mentioned first preheater and the second preheater are heat exchanger.
The utility model system sets the first preheater and the second preheater, indirect steam before the MVR evaporators It is cooled in MVR evaporators and forced-circulation evaporator and forms condensate liquid and do not coagulate steam, condensate liquid and not solidifying steam is drained into The steam that do not coagulate condensed in liquid case, condensation liquid case is preheated into the first preheater to feed liquid, the condensate liquid in condensation liquid case Material is preheated again into the second heat exchanger, heat, energy-conserving and environment-protective is made full use of.
In the utility model system, the effect of described MVR evaporators is to evaporate high-salt wastewater feed liquid, is produced substantial amounts of Gas-liquid mixture and concentrate.The effect of gas-liquid separator is that the gas-liquid mixture for producing MVR evaporators carries out gas-liquid separation, Obtain concentrate and indirect steam.
In order to improve the quality of crystal salt, the utility model system is provided with forced-circulation evaporator, crystallizer and circulation Pump, wherein, forced-circulation evaporator continues concentrate to evaporate, and produces the concentrate containing crystal salt;Crystallizer is crystal salt Growth stable condition is provided, while by the isolated magma of the concentrate containing crystal salt, mother liquor and indirect steam.It is above-mentioned The growth for being set to crystal provides stable condition, can grow that particle is larger and uniform crystal, be suitable for continuously grasping Make.
The indirect steam of the gas-liquid separator and crystallizer is after being compressed into superheated steam, temperature, pressure rise, heat Enthalpy increase, continuation is used as MVR evaporators and the thermal source of forced-circulation evaporator, environmental protection and energy saving.
The MVR evaporators are divided into upper and lower two regions, and upper area sets heat-exchanging tube bundle, and lower area is mixed for gas-liquid Close in room, mixing chamber and be provided with baffle plate.
Further, upper area sets heat-exchanging tube bundle, and material produces gas-liquid mixture and concentration by Secondary-steam heating Liquid, while indirect steam is cooled to form condensate liquid;Lower area is that baffle plate is set in gas-liquid mixed room, mixing chamber, for gas The initial gross separation of liquid.
Set in order to further improve gas-liquid separation efficiency, in the gas-liquid separator hydraulic barrier, wire mesh demister and Sintered metal filter.It is preferred that, the filtering accuracy of the wire mesh demister is 100~200 μm, sintered metal filter used Filtering accuracy be 30~50 μm, gas-liquid separation efficiency can reach more than 98%.
In order to further improve, wire mesh demister is set in gas-liquid separation efficiency, the crystallizer.It is preferred that, the silk screen The filtering accuracy of demister is 100~200 μm, and gas-liquid separation efficiency can reach more than 95%.
The MVR evaporators and gas-liquid separator are equipped with liquid level gauge, and the concentrated solution outlet of bottom, which is equipped with, to be automatically adjusted Valve, controls the liquid level of MVR evaporators and gas-liquid separator respectively.
The outlet of the first circulation pump is directly connected with the concentrate import of MVR evaporators, the first circulation pump Automatic regulating valve is provided between outlet and the concentrate import of forced-circulation evaporator.
The system also includes raw material pump, is placed between head tank and the first preheater.
The system also includes condensate pump, is placed between condensate drum and the second preheater.
The system also includes salt pump, is placed between crystallizer and centrifuge.
The system also includes mother liquor tank and mother liquor pump, is placed between centrifuge and forced-circulation evaporator.
The system also includes clean water tank and clarified water pump, and then clean water tank connection clarified water pump is connected with steam generator.
The method that the function of mechanical steam recompression evaporative crystallization of high-salt wastewater is carried out using said system, including:
The high-salt wastewater being stored in head tank is warming up to 80~90 DEG C after the first preheater and the heating of the second preheater, Into MVR evaporators, it is concentrated by evaporation repeatedly, obtains gas-liquid mixture and concentrate, wherein gas-liquid mixture enters gas Gas-liquid separation is carried out in liquid/gas separator, concentrate and indirect steam are obtained in gas-liquid separator;
The concentrate that MVR evaporators and gas-liquid separator are produced introduces MVR evaporators through first circulation pump to be continued to evaporate, Because MVR evaporators and gas-liquid separator bottom are provided with liquid level gauge and control valve, certain concentrate liquid level can be maintained, when When concentrate is reached close to the predetermined value of saturated concentration, the automatic valve between first circulation pump and forced-circulation evaporator is opened Door, will close to the concentrate of saturation by first circulation pump introduce forced-circulation evaporator be concentrated by evaporation again, it is laggard Enter crystallizer, in a crystallizer isolated mother liquor, magma and indirect steam, wherein mother liquor returns to pressure through second circulation pump and followed Continue to evaporate in ring evaporator, magma is entered to introduce centrifuge, the crystal salt after centrifugation reclaimed, obtained mother liquor is again Continue to evaporate into forced-circulation evaporator;
By the indirect steam of gas-liquid separator and crystallizer by being again introduced into MVR evaporators and pressure after compressor compresses Circulating evaporator is heated;
By the condensate liquid being cooled into forced-circulation evaporator and MVR evaporators and do not coagulate steam and import condensate drum, Wherein, steam is not coagulated respectively to preheat feed liquid into the second preheater into the first preheater, condensate liquid;
When initial system boot and not enough vapor (steam) temperature, start steam generator supplement live steam.
Method of the present utility model is by high-salt wastewater after two-stage is preheated, to be circulated in feeding MVR evaporators It is concentrated by evaporation, and the isolated concentrate and indirect steam close to saturation in gas-liquid separator.By close to the concentration of saturation Liquid is delivered in forced-circulation evaporator and is further concentrated by evaporation, and isolated magma, mother liquor and secondary steaming in a crystallizer Vapour.Magma is delivered to centrifuge and carries out centrifugal treating, crystal salt and mother liquor is respectively obtained, mother liquor is repeated to enter and forced after converging It is concentrated by evaporation in circulating evaporator.Indirect steam isolated twice is compressed as thermal source jointly, MVR steamings are re-introduced into Device and forced-circulation evaporator are sent out, the utilization of its latent heat is realized.
Beneficial effect:Evaporation and crystallization system and side using high-salt wastewater function of mechanical steam recompression described in the utility model Method, has the advantages that:(1) the utility model only need a Mechanical Vapor Compression can think MVR evaporators and Forced-circulation evaporator provides indirect steam as heat source, and construction cost is relatively low;(2) energy of indirect steam is adequately achieved Amount is reclaimed, and the indirect steam that evaporation and crystallization are produced is sent to MVR evaporators and forced-circulation evaporator as heating after compression Steam is used, and is saved very much;(3) two-stage preheater is provided with, indirect steam is utilized respectively and condenses the condensate liquid to be formed and do not coagulate Steam is preheated to high-salt wastewater charging, can further saved, while eliminating the cooling system of indirect steam as thermal source System;(4) the utility model sets forced-circulation evaporator, crystallizer and circulating pump, and stable bar is provided for the growth of crystal Part, can grow that particle is larger and uniform crystal, so that crystalline quality is stabilized control.In summary, this practicality is new The evaporation and crystallization system and method for the high-salt wastewater function of mechanical steam recompression that type is provided, rational technology are with low cost, and technique is steady Fixed, beneficial to consecutive production, the quality of crystal salt is high, while having reached good energy-saving effect.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model system.
In figure:1st, head tank;2nd, raw material pump;3rd, the first preheater;4th, the second preheater;5th, MVR evaporators;6th, gas-liquid point From device;7th, compressor;8th, first circulation pump;9th, condensate pump;10th, condensate drum;11st, forced-circulation evaporator;12nd, second follow Ring pump;13rd, crystallizer;14th, salt pump is gone out;15th, centrifuge;16th, mother liquor tank;17th, mother liquor pump;18th, clean water tank;19th, clarified water pump; 20th, steam generator;21st, vavuum pump.
Embodiment
The utility model is explained in detail with reference to specific embodiment.
Embodiment 1
A kind of function of mechanical steam recompression evaporation and crystallization system of high-salt wastewater:
Including head tank 1, raw material pump 2, the first preheater 3, the second preheater 4, MVR evaporators 5, gas-liquid separator 6, pressure Contracting machine 7, first circulation pump 8, condensate pump 9, condensate drum 10, forced-circulation evaporator 11, second circulation pump 12, crystallizer 13rd, salt pump 14, centrifuge 15, mother liquor tank 16, mother liquor pump 17, clean water tank 18, clarified water pump 19, steam generator 20 and vavuum pump are gone out 21;
The entrance of the connection raw material of head tank 1 pump 2, the outlet of raw material pump 2 is sequentially connected the first preheater 3 by pipeline With the second preheater 4, the liquor inlet of the material liquid outlet connection MVR evaporators 5 of the second preheater 4;
The entrance of the gas-liquid mixture outlet connection gas-liquid separator 6 of the MVR evaporators 5, the concentrate of MVR evaporators 5 Outlet and the outlet of the concentrate of gas-liquid separator 6 be connected by threeway with the entrance of first circulation pump 8, first circulation pump 8 Outlet connects the concentrate import of MVR evaporators 5 and the concentrate import of forced-circulation evaporator 11 respectively by threeway;Its In, the outlet of the concentrate of MVR evaporators 5 and the outlet of the concentrate of gas-liquid separator 6 be provided with liquid level gauge and automatic valve V1 and V2, is provided with automatic valve V4 between first circulation pump 8 and forced-circulation evaporator 11;
The concentrated solution outlet of the forced-circulation evaporator 11 connects the entrance of crystallizer 13, the mother liquor outlet of crystallizer 13 Connect the entrance of second circulation pump 12, the concentrate import of the outlet connection forced-circulation evaporator 11 of second circulation pump 12, knot The magma outlet of brilliant device 13 connects out the entrance of salt pump 14, goes out the entrance of the outlet connection centrifuge 15 of salt pump 14;
The mother liquor outlet of the centrifuge 15 connects the entrance of mother liquor tank 16, the outlet connection mother liquor pump 17 of mother liquor tank 16 Entrance, the concentrate import of the outlet connection forced-circulation evaporator 11 of mother liquor pump 17;
The steam (vapor) outlet of the gas-liquid separator 6 and the steam (vapor) outlet of crystallizer 13 connect the entrance of compressor 7 respectively, pressure The outlet of contracting machine 7 connects the steam inlet of MVR evaporators 5 and the steam inlet of forced-circulation evaporator 11 respectively;
The condensate outlet of the MVR evaporators 5 and the condensate outlet of forced-circulation evaporator 11 by threeway with it is cold The steam that do not coagulate in the entrance connection of lime set tank 10, condensate drum 10 enters the first preheater 3, is extracted out by vavuum pump 21, cold Condensate liquid in lime set tank 10 is discharged after condensate pump 9 enters the second heat exchanger 4;
The clean water tank 18 connects clarified water pump 19, the outlet connection steam generator 20 of clarified water pump 19, steam generator 20 Outlet connection MVR evaporators 5 steam inlet;Valve V3 is provided between steam generator 20 and MVR evaporators 5.
In addition, above-mentioned 5 points of MVR evaporators are upper and lower two regions, upper area sets heat-exchanging tube bundle, and lower area is Baffle plate is provided with gas-liquid mixed room, mixing chamber;Hydraulic barrier, wire mesh demister and sintering are set in above-mentioned gas-liquid separator 6 Metallic filter, wherein, the filtering accuracy of wire mesh demister is 100~200 μm, the filtering accuracy of sintered metal filter used For 30~50 μm, gas-liquid separation efficiency can reach more than 98%;Wire mesh demister is set in above-mentioned crystallizer 13, and filtering accuracy is 100~200 μm, gas-liquid separation efficiency can reach more than 95%.
Embodiment 2
The method that the function of mechanical steam recompression evaporative crystallization of high-salt wastewater is carried out using system described in embodiment, including:
High-salt wastewater in head tank 1 is delivered to the first preheater 3 by raw material pump 2, with not coagulating in the first preheater 3 Steam carries out heat exchange heating, and the second preheater 4 is entered back into afterwards and carries out heat exchange heating with condensate liquid, in the heat exchange of condensate liquid 80~90 DEG C are warming up under effect;
Hot material liquid after heating enters MVR evaporators 5, the indirect steam after being compressed in MVR evaporators 5 with compressor 7 Exchanged heat, reach that evaporating temperature forms substantial amounts of gas-liquid mixture and concentrate, wherein gas-liquid mixture enters gas-liquid separation Gas-liquid separation is carried out in device 6, concentrate and indirect steam are obtained in gas-liquid separator 6;
The bottom concentrate of MVR evaporators 5 and gas-liquid separator 6 enters MVR evaporators 5 by first circulation pump 8 to be continued Evaporation;The bottom of MVR evaporators 5 and gas-liquid separator 6 is provided with liquid level gauge and automatic valve V1 and V2, can automatic regulating valve Door V1 and V2 aperture maintains the liquid level in MVR evaporators 5 and gas-liquid separator 6;When concentrate is reached close to saturated concentration Predetermined value, open automatic valve V4 forced-circulation evaporator 11 will be introduced by first circulation pump 8 close to the concentrate of saturation It is concentrated by evaporation again, obtains magma, mother liquor and indirect steam into the Crystallization Separation of crystallizer 13 afterwards;
The indirect steam of gas-liquid separator 6 and crystallizer 13 is introduced into compressor 7, superheated steam is compressed into, is re-fed into MVR Evaporator 5 and forced-circulation evaporator 11 are recycled as heating energy source;Indirect steam is in MVR evaporators 5 and forced circulation The condensate liquid and not solidifying steam that evaporator 11 is cooled into are exported to condensate drum 10, and the wherein condensed liquid pump 9 of condensate liquid is conveyed To the second preheater 4 as heating energy source, steam is not coagulated and is delivered to 3 pairs of the first preheater as heating energy source, and passes through vacuum Pump 21 is extracted out;
Magma is centrifuged by going out salt pump 14 into centrifuge 15, and the crystal salt after centrifugation is reclaimed, and obtained mother liquor enters Mother liquor tank 16, is delivered to forced-circulation evaporator 11 by mother liquor pump 17 and is evaporated concentration again, then returns to crystallizer 13 Proceed Crystallization Separation;
When initial start and not enough vapor (steam) temperature, start clarified water pump 19, steam generator 20 and automatic valve V3 and mended Fill live steam.
Using such scheme, this technique carries out MVR PROCESS FOR TREATMENTs to high-salt wastewater, needed for isolating salt, present treatment technique Condition is low, can continuously produce, increase substantially production efficiency, significantly reduce production cost.

Claims (7)

1. the function of mechanical steam recompression evaporation and crystallization system of a kind of high-salt wastewater, it is characterised in that including head tank (1), first It is preheater (3), the second preheater (4), MVR evaporators (5), gas-liquid separator (6), compressor (7), first circulation pump (8), cold Lime set tank (10), forced-circulation evaporator (11), second circulation pump (12), crystallizer (13), centrifuge (15) and steam generation Device (20);
The head tank (1), the first preheater (3), the second preheater (4) and MVR evaporators (5) are sequentially connected by pipeline;
The MVR evaporators (5) gas-liquid mixture outlet connection gas-liquid separator (6) entrance, MVR evaporators (5) it is dense Contracting liquid is exported and the concentrated solution outlet of gas-liquid separator (6) is connected by threeway with the entrance of first circulation pump (8), first circulation The outlet of pump (8) connects the concentrate import of MVR evaporators (5) and the concentration of forced-circulation evaporator (11) by threeway respectively Liquid import;
The entrance of the concentrated solution outlet connection crystallizer (13) of the forced-circulation evaporator (11), the mother liquor of crystallizer (13) goes out The entrance of mouth connection second circulation pump (12), the concentrate of the outlet connection forced-circulation evaporator (11) of second circulation pump (12) Import;The entrance of the magma outlet connection centrifuge (15) of crystallizer (13), the mother liquor outlet of centrifuge (15) is connected to pressure The concentrate import of circulating evaporator (11);
The steam (vapor) outlet of the gas-liquid separator (6) and the steam (vapor) outlet of crystallizer (13) connect the entrance of compressor (7) respectively, The outlet of compressor (7) connects the steam inlet of MVR evaporators (5) and the steam inlet of forced-circulation evaporator (11) respectively;
The condensate outlet of the MVR evaporators (5) and the condensate outlet of forced-circulation evaporator (11) by threeway with it is cold The steam that do not coagulate in the entrance connection of lime set tank (10), condensate drum (10) is discharged afterwards into the first preheater (3), condensate drum (10) condensate liquid in is discharged afterwards into the second preheater (4);
The steam inlet of the MVR evaporators (5) is also associated with steam generator (20).
2. evaporation and crystallization system according to claim 1, it is characterised in that the MVR evaporators (5) are divided into upper and lower two Individual region, upper area sets heat-exchanging tube bundle, and lower area is to be provided with baffle plate in gas-liquid mixed room, mixing chamber.
3. evaporation and crystallization system according to claim 1, it is characterised in that baffling is set in the gas-liquid separator (6) Baffle plate, wire mesh demister and sintered metal filter.
4. evaporation and crystallization system according to claim 3, it is characterised in that the filtering accuracy of the wire mesh demister is 100~200 μm, the filtering accuracy of sintered metal filter used is 30~50 μm.
5. evaporation and crystallization system according to claim 1, it is characterised in that silk screen foam removal is set in the crystallizer (13) Device, filtering accuracy is 100~200 μm.
6. evaporation and crystallization system according to claim 1, it is characterised in that the MVR evaporators (5) and gas-liquid separator (6) liquid level gauge is equipped with, the concentrated solution outlet of bottom is equipped with automatic regulating valve, MVR evaporators (5) and gas-liquid point is controlled respectively From the liquid level of device (6).
7. evaporation and crystallization system according to claim 1, it is characterised in that the outlet of the first circulation pump (8) and MVR The concentrate import of evaporator (5) is directly connected, and the outlet of the first circulation pump (8) is dense with forced-circulation evaporator (11) Automatic regulating valve is provided between contracting liquid import.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106669207A (en) * 2017-02-27 2017-05-17 江苏省环境科学研究院 MVR (mechanical vapor recompression) evaporation crystallization system and method for high-salinity wastewater
CN109319996A (en) * 2018-10-29 2019-02-12 泰兴锦汇化工有限公司 A kind of processing method of high-COD waste water with high salt
CN110372052A (en) * 2019-07-09 2019-10-25 中国航发哈尔滨东安发动机有限公司 A kind of isolated island formula miniature gas turbine vapor recompression system and control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106669207A (en) * 2017-02-27 2017-05-17 江苏省环境科学研究院 MVR (mechanical vapor recompression) evaporation crystallization system and method for high-salinity wastewater
CN109319996A (en) * 2018-10-29 2019-02-12 泰兴锦汇化工有限公司 A kind of processing method of high-COD waste water with high salt
CN110372052A (en) * 2019-07-09 2019-10-25 中国航发哈尔滨东安发动机有限公司 A kind of isolated island formula miniature gas turbine vapor recompression system and control method
CN110372052B (en) * 2019-07-09 2021-09-24 中国航发哈尔滨东安发动机有限公司 Island type micro gas turbine steam recompression system and control method

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