CN105435480A - Vacuum push-pull alcohol concentration system - Google Patents
Vacuum push-pull alcohol concentration system Download PDFInfo
- Publication number
- CN105435480A CN105435480A CN201511003385.8A CN201511003385A CN105435480A CN 105435480 A CN105435480 A CN 105435480A CN 201511003385 A CN201511003385 A CN 201511003385A CN 105435480 A CN105435480 A CN 105435480A
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- communicated
- concentration
- heater
- sheet frame
- alcohol concentration
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/78—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by condensation or crystallisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides a vacuum push-pull alcohol concentration system. The vacuum push-pull alcohol concentration system comprises a refrigeration compressor, a double-tube sheet heater, a concentration evaporating pot, a sheet frame condenser, a vacuum pump with a large water ring, an afterheat preheater and a vacuum pump with a small water ring, wherein the refrigeration compressor is communicated with the double-tube sheet heater; the double-tube sheet heater is communicated with the concentration evaporating pot; the concentration evaporating pot is divided into two branches which are respectively communicated with the sheet frame condenser and the vacuum pump with the large water ring; the sheet frame condenser is communicated with the afterheat preheater; the afterheat preheater is communicated with the vacuum pump with the small water ring. The vacuum push-pull alcohol concentration system is a novel vacuum push-pull concentration device which is capable of heating to-be-concentrated solution through a heat exchanger by use of a hot end of the refrigeration compressor and condensing and concentrating secondary steam by use of a cold end of the refrigeration compressor. The vacuum push-pull alcohol concentration system has safety in alcohol solution concentration, is a better selection for enterprises incapable of using gas-fired boilers, is slightly inferior to MVR in the aspect of energy conservation and has cost approximate to common double-effect concentration.
Description
Technical field
The present invention relates to alcohol and concentrate field, refer to that a kind of vacuum recommends alcohol concentration systems especially.
Background technology
The development of liquid concentration process-intensive is maked rapid progress, and has single-action, economic benefits and social benefits, heat pump economic benefits and social benefits, MVR etc.
Wherein at present the most energy-conservation is use MVR technology, be utilize vapo(u)rization system self to produce indirect steam through compressor compressed action, the heat content of lifting indirect steam, circulates to a power-saving technology of vapo(u)rization system heat supply.
Usual MVR mode has use centrifugal blower, centrifugal compressor and lobed rotor compressor.Any mode is all adopt mechanical system indirect steam to be compressed to the temperature improving steam.There is the situation such as friction, collision of machinery in this process, this brings certain potential safety hazard for the concentrated of ethanolic solution unavoidably.Therefore, MVR technology is not too applicable to ethanol concentration technology.
Another kind of ethanol concentration technology is the method adopting Boiler Steam heating.Current domestic conventional be that single-action concentrates, although economic benefits and social benefits save the steam of 50% than single-action, the ethanol yield concentrated due to economic benefits and social benefits ethanol is lower, so domestic there be limited evidence currently of uses ethanol economic benefits and social benefits concentrator.The invention that latest domestic is released is a kind of method for concentration adopting economic benefits and social benefits to combine " spraying mass transfer formula freezer condenser " " a kind of closed circuit economic benefits and social benefits alcohol concentrates unit ".Its advantage is that safely, efficiently whole unit is almost without discharge, and therefore the ethanol rate of recovery is very high, but this technique is also the method for concentration adopting Boiler Steam.Close down coal-burning boiler for without boiler or due to Environmental Factors, must the enterprise of choice for use gas fired-boiler be difficult to accept, because greatly will strengthen cost, coal-fired steam cost is less than 200 yuan/ton, and combustion gas wants about 400 yuan.Phasing out coal-burning boiler from environmental protection overall situation is a trend.
Summary of the invention
The present invention proposes a kind of vacuum and recommends alcohol concentration systems, solves the problems of the prior art.
Technical scheme of the present invention is achieved in that
A kind of vacuum recommends alcohol concentration systems, described vacuum is recommended alcohol concentration systems and is comprised refrigeration compressor, double tubesheet heater, concentration and evaporation tank, sheet frame condenser, large water ring vacuum pump, waste heat preheater and little water ring vacuum pump, and described refrigeration compressor is communicated with described double tubesheet heater; Described double tubesheet heater is communicated with described concentration and evaporation tank; Described concentration and evaporation tank separates two branch roads and is communicated with sheet frame condenser and large water ring vacuum pump respectively; Described sheet frame condenser is communicated with described waste heat preheater; Described waste heat preheater is communicated with described little water ring vacuum pump.
The present invention is the one application of heat pump techniques.Utilize compressor to heat solution to be concentrated to the heat that refrigerant compression produces through heat exchanger, concentrate evaporates in evaporator, the condenser of indirect steam through being low-temperature receiver with compressor cold junction of generation, carrys out cooling down discharge condensed water and reaches concentrated object.
This be a kind of utilize refrigeration compressor heat, cold junction recommend effect under concentrator, it is applicable to the ethanol concentration technology without boiler enterprise.
Refrigeration machine operation principle: the high temperature that refrigerant compression produces by compressor is by condenser (radiator) radiating and cooling, refrigerant after cooling to be released further decrease temperature and pressure through expansion valve, absorb heat to evaporimeter, obtain cold junction heat energy Posterior circle and obtain higher heat energy to compressor compresses.
Heat balance principle of the present invention is the same with general refrigerating system, just different for object difference address.Its heater is called condenser concerning general refrigerating system, and its condenser is called evaporimeter concerning general refrigerating system.Refrigeration system is as a rule single use refrigeration end or heats end, and the present invention is refrigeration end and heats end and use simultaneously.Adopt hot junction heated solution, cold junction condensed steam, concentrates under pushing away, drawing effect.
As preferred version of the present invention, described sheet frame condenser comprises four ports, is respectively the first port, the second port, the 3rd port and the 4th port; Described waste heat preheater comprises first end, the second end, the 3rd end and the 4th end; Described concentration and evaporation tank is connected with the second port of described sheet frame condenser; The other end of described double tubesheet heater is connected with the first port of described sheet frame condenser.
As preferred version of the present invention, be communicated with the pipe fitting of described double tubesheet heater and described concentration and evaporation tank, one end is from double tubesheet heater, and the other end inserts the inside of described concentration and evaporation tank, and the end of the described pipe fitting other end is provided with mouth spray.
As preferred version of the present invention, in the middle of described concentration and evaporation tank and described large water ring vacuum pump, be provided with one first check valve.
As preferred version of the present invention, described double tubesheet heater side is provided with a branch road and connects an expansion valve, and the other end of described expansion valve is connected with the 3rd port of described sheet frame condenser.
As preferred version of the present invention, described double tubesheet heater is communicated with a Pump for giving-out, and in addition, described Pump for giving-out is connected with a densitometer, and the described densitometric other end is connected to the lower end of described concentration and evaporation tank; Meanwhile, described Pump for giving-out connects one second check valve, and the other end of described second check valve connects a concentrate storage tank.
As preferred version of the present invention, described waste heat preheater first end is communicated with the 4th port of described sheet frame condenser; Second end of described waste heat preheater is communicated with a pneumatic operated valve; Described waste heat preheater the 3rd end is communicated with a thin liquid storage tank; Described waste heat preheater the 4th end is communicated with a gas-liquid separator.
As preferred version of the present invention, the other end of described pneumatic operated valve is communicated with a feed liquor cooling shower nozzle, and it is inner that described feed liquor cooling shower nozzle is located at described concentration and evaporation tank.
As preferred version of the present invention, described gas-liquid separator is connected with a condensed water storage tank, and meanwhile, described gas-liquid separator is connected with a little water ring vacuum pump.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is overall system structure schematic diagram of the present invention.
In figure, refrigeration compressor 1, double tubesheet heater 2, concentration and evaporation tank 3, sheet frame condenser 4, large water ring vacuum pump 5, waste heat preheater 6, little water ring vacuum pump 7, expansion valve 21, mouth spray 31, pressure transmitter 32, pneumatic operated valve 33, feed liquor cooling shower nozzle 34, densitometer 35, Pump for giving-out 36, second check valve 37, concentrate storage tank 38, first check valve 39, first port 41, second port 42, 3rd port 43, 4th port 44, thin liquid storage tank 61, gas-liquid separator 62, condensed water storage tank 63, first end 64, second end 65, 3rd end 66, 4th end 67.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of vacuum recommends alcohol concentration systems, comprise refrigeration compressor 1, double tubesheet heater 2, concentration and evaporation tank 3, sheet frame condenser 4, large water ring vacuum pump 5, waste heat preheater 6 and little water ring vacuum pump 7, refrigeration compressor 1 is communicated with double tubesheet heater 2; Double tubesheet heater 2 is communicated with concentration and evaporation tank 3; Concentration and evaporation tank 3 separates two branch roads and is communicated with sheet frame condenser 4 and large water ring vacuum pump 5 respectively; Sheet frame condenser 4 is communicated with waste heat preheater 6; Waste heat preheater 6 is communicated with little water ring vacuum pump 7.
Sheet frame condenser 4 comprises four ports, is respectively the first port 41, second port 42, the 3rd port 43 and the 4th port 44; Waste heat preheater 6 comprises first end 64, second end 65, the 3rd end 66 and the 4th end 67; Concentration and evaporation tank 3 is connected with the second port 42 of sheet frame condenser 4; The other end of double tubesheet heater 2 is connected with the first port 41 of sheet frame condenser 4.
Be communicated with the pipe fitting of double tubesheet heater 2 and concentration and evaporation tank 3, one end is from double tubesheet heater, and the other end inserts the inside of described concentration and evaporation tank 3, and the end of the pipe fitting other end is provided with mouth spray.
One first check valve 39 is provided with in the middle of concentration and evaporation tank 3 and described large water ring vacuum pump.Double tubesheet heater 2 side is provided with a branch road and connects an expansion valve 21, and the other end of expansion valve is connected with the 3rd port 43 of sheet frame condenser 4.
Double tubesheet heater 2 is communicated with a Pump for giving-out 36, and in addition, Pump for giving-out 36 is connected with a densitometer 35, and the other end of densitometer 35 is connected to the lower end of concentration and evaporation tank 3; Meanwhile, the other end that Pump for giving-out 36 connects one second check valve 37, second check valve connects a concentrate storage tank 38.Waste heat preheater 6 first end is communicated with the 4th port 44 of sheet frame condenser 4; Second end 65 of waste heat preheater 6 is communicated with a pneumatic operated valve 33; Waste heat preheater the 3rd end 66 is communicated with a thin liquid storage tank 61; Waste heat preheater 6 the 4th end 67 is communicated with a gas-liquid separator 62.The other end of pneumatic operated valve 33 is communicated with a feed liquor cooling shower nozzle 34, and it is inner that feed liquor cooling shower nozzle 34 is located at concentration and evaporation tank 3.Gas-liquid separator 62 is connected with a condensed water storage tank 63, and meanwhile, gas-liquid separator is connected with a little water ring vacuum pump 7.
Operation principle of the present invention is as follows:
(1) heat
Refrigerant enters compressor 1 at middle temperature low pressure refrigerant entrance, and after being compressed, its temperature raises, and enters double tubesheet heater 2 through HTHP refrigerant inlet.Cryogenic fluid enters in double tubesheet heater 2 at cryogenic fluid entrance, after being heated from taphole out, sprays in the evaporation and concentration tank 3 of vacuum through mouth spray by HTHP refrigerant.Refrigerant after heat exchange cooling therefrom warm high pressure refrigerant exit discharge and arrive expansion valve 21.
(2) evaporate
Bumping evaporation immediately in the solution of high temperature sprays into high vacuum concentration and evaporation tank 3 from mouth spray 31, indirect steam is discharged from steam (vapor) outlet, unevaporated solution falls at the bottom of evaporator and flows back to double tubesheet heater 2 through concentration tank circulation pipe, is recycled heating through cryogenic fluid entrance.The liquid level of concentration tank 3 controls the unlatching of inlet pneumatic operated valve 33 under the signal function of pressure transmitter 32, and when low liquid level, fluid infusion opened by pneumatic operated valve 33.
(3) condensation
Heated solution after the refrigerant of HTHP enters double tubesheet heater 2 and cool self, become the refrigerant of middle temperature high pressure, expansion valve 21 is flowed through by middle temperature high pressure refrigerant exit, undergoes rapid expansion decrease temperature and pressure, refrigerant after expansion enters in sheet frame condenser 4 through low-temp low-pressure refrigerant inlet, refrigerant intensification therefrom warm low pressure refrigerant outlet circulation inflow compressor after heat exchange.The indirect steam of concentration and evaporation tank 3 enters in sheet frame condenser 4 through steam inlet under the draft effect of little water ring vacuum pump 7, indirect steam is caught a cold and is condensed into condensed water and discharge from condensation-water drain, and the condensed water of high temperature is sent in waste heat preheater 6 and heats new liquid.
(4) vacuum
Vacuum of the present invention is recommended concentrated unit whole system and is run under vacuum conditions, and born by the large water ring vacuum pump 5 of relatively high power when starting, directly connect concentration and evaporation tank 3 through the first check valve 39, system on-condensible gas is discharged by exhaust outlet.Close large water ring vacuum pump 5 when system reaches setting vacuum, only need low power little water ring vacuum pump 7 to continue to maintain operation, on-condensible gas enters little water ring pump through outlet and discharges.
After after running, the indirect steam of concentration and evaporation tank 3 enters sheet frame condenser 4, alcohol gas chance is cold becomes condensate liquid, volume there occurs fierce contraction, the saturated alcohol vapour of 3.0 cubic metres becomes the ethanol liquid of 0.0011 cubic metre in the environment of-0.08Mpa, Volume Changes nearly 3000 times, therefore can maintain the high vacuum of system when continuous condensation.Little water ring vacuum pump 7 now only play a part arrange on-condensible gas, if because also exist in system 1% on-condensible gas, the coefficient of heat transfer of system will reduce by 60%.
(5) preheating
Indirect steam is after sheet frame condenser condenses becomes liquid, condensate liquid still has higher temperature, the condensate liquid of high temperature enters in waste heat heat retrieving apparatus 6 by the condensation-water drain of sheet frame condenser 4, solution in thin liquid storage tank 61 enters in waste heat preheater 6, from hot solution outlet flow toward concentration and evaporation tank after being heated through cold soln entrance under the suction of concentration tank 3 high vacuum.Condensed water, after gas-liquid separator 62 is separated, flows directly in condensed water storage tank 63 when 10 meters of drops, discharges if inadequate 10 meters of drops need add pump.Condensate liquid achieves UTILIZATION OF VESIDUAL HEAT IN by preheater, improves the capacity usage ratio of system on the one hand, makes condensate liquid excessively cold on the other hand, reduces the volatilization of ethanol.
(6) fluid
The circulation pipe of concentration and evaporation tank 3 has been installed densitometer 35, when reaching setting concentration, densitometer sends signal Pump for giving-out 36 and starts, concentrate is thrown in concentrate storage tank 38, when concentration closes Pump for giving-out 36 automatically lower than during setting value, the second check valve 37 automatic blocking under system suction function.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a vacuum recommends alcohol concentration systems, it is characterized in that, described vacuum is recommended alcohol concentration systems and is comprised refrigeration compressor, double tubesheet heater, concentration and evaporation tank, sheet frame condenser, large water ring vacuum pump, waste heat preheater and little water ring vacuum pump, and described refrigeration compressor is communicated with described double tubesheet heater; Described double tubesheet heater is communicated with described concentration and evaporation tank; Described concentration and evaporation tank separates two branch roads and is communicated with sheet frame condenser and large water ring vacuum pump respectively; Described sheet frame condenser is communicated with described waste heat preheater; Described waste heat preheater is communicated with described little water ring vacuum pump.
2. a kind of vacuum according to claim 1 recommends alcohol concentration systems, it is characterized in that, described sheet frame condenser comprises four ports, is respectively the first port, the second port, the 3rd port and the 4th port; Described waste heat preheater comprises first end, the second end, the 3rd end and the 4th end; Described concentration and evaporation tank is connected with the second port of described sheet frame condenser; The other end of described double tubesheet heater is connected with the first port of described sheet frame condenser.
3. a kind of vacuum according to claim 1 recommends alcohol concentration systems, it is characterized in that, be communicated with the pipe fitting of described double tubesheet heater and described concentration and evaporation tank, one end is from double tubesheet heater, the other end inserts the inside of described concentration and evaporation tank, and the end of the described pipe fitting other end is provided with mouth spray.
4. a kind of vacuum according to claim 1 recommends alcohol concentration systems, it is characterized in that, is provided with one first check valve in the middle of described concentration and evaporation tank and described large water ring vacuum pump.
5. a kind of vacuum according to claim 2 recommends alcohol concentration systems, it is characterized in that, described double tubesheet heater side is provided with a branch road and connects an expansion valve, and the other end of described expansion valve is connected with the 3rd port of described sheet frame condenser.
6. a kind of vacuum according to claim 1 recommends alcohol concentration systems, it is characterized in that, described double tubesheet heater is communicated with a Pump for giving-out, in addition, described Pump for giving-out is connected with a densitometer, and the described densitometric other end is connected to the lower end of described concentration and evaporation tank; Meanwhile, described Pump for giving-out connects one second check valve, and the other end of described second check valve connects a concentrate storage tank.
7. a kind of vacuum according to claim 2 recommends alcohol concentration systems, it is characterized in that, described waste heat preheater first end is communicated with the 4th port of described sheet frame condenser; Second end of described waste heat preheater is communicated with a pneumatic operated valve; Described waste heat preheater the 3rd end is communicated with a thin liquid storage tank; Described waste heat preheater the 4th end is communicated with a gas-liquid separator.
8. a kind of vacuum according to claim 7 recommends alcohol concentration systems, it is characterized in that, the other end of described pneumatic operated valve is communicated with a feed liquor cooling shower nozzle, and it is inner that described feed liquor cooling shower nozzle is located at described concentration and evaporation tank.
9. a kind of vacuum according to claim 7 recommends alcohol concentration systems, it is characterized in that, described gas-liquid separator is connected with a condensed water storage tank, and meanwhile, described gas-liquid separator is connected with a little water ring vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003385.8A CN105435480B (en) | 2015-12-25 | 2015-12-25 | Vacuum recommends alcohol concentration systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003385.8A CN105435480B (en) | 2015-12-25 | 2015-12-25 | Vacuum recommends alcohol concentration systems |
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| Publication Number | Publication Date |
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| CN105435480A true CN105435480A (en) | 2016-03-30 |
| CN105435480B CN105435480B (en) | 2017-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201511003385.8A Active CN105435480B (en) | 2015-12-25 | 2015-12-25 | Vacuum recommends alcohol concentration systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106268268A (en) * | 2016-08-26 | 2017-01-04 | 江苏中圣高科技产业有限公司 | A kind of ammonifying more also produces desulfurizer and the method for liquid sulfur dioxide |
| CN110624265A (en) * | 2019-10-28 | 2019-12-31 | 刘小江 | Multistage heating and thermal cycle negative pressure evaporation type solution concentration device |
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| CN103566613A (en) * | 2012-08-06 | 2014-02-12 | 南通醋酸纤维有限公司 | Rectification device and process for low-concentration organic solvent aqueous liquor recycling heat pump |
| EP2733437A1 (en) * | 2012-11-20 | 2014-05-21 | Panasonic Corporation | Heat pump water heater |
| CN203861933U (en) * | 2014-06-17 | 2014-10-08 | 黄华 | Heat-pump vacuum-concentration drying device |
| CN105056554A (en) * | 2015-07-22 | 2015-11-18 | 上海远跃制药机械有限公司 | Closed-loop heat-pump evaporation unit |
| CN205252562U (en) * | 2015-12-25 | 2016-05-25 | 佛山德众制药机械有限公司 | Pure concentrated system is recommended in vacuum |
-
2015
- 2015-12-25 CN CN201511003385.8A patent/CN105435480B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103566613A (en) * | 2012-08-06 | 2014-02-12 | 南通醋酸纤维有限公司 | Rectification device and process for low-concentration organic solvent aqueous liquor recycling heat pump |
| EP2733437A1 (en) * | 2012-11-20 | 2014-05-21 | Panasonic Corporation | Heat pump water heater |
| CN203861933U (en) * | 2014-06-17 | 2014-10-08 | 黄华 | Heat-pump vacuum-concentration drying device |
| CN105056554A (en) * | 2015-07-22 | 2015-11-18 | 上海远跃制药机械有限公司 | Closed-loop heat-pump evaporation unit |
| CN205252562U (en) * | 2015-12-25 | 2016-05-25 | 佛山德众制药机械有限公司 | Pure concentrated system is recommended in vacuum |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106268268A (en) * | 2016-08-26 | 2017-01-04 | 江苏中圣高科技产业有限公司 | A kind of ammonifying more also produces desulfurizer and the method for liquid sulfur dioxide |
| CN110624265A (en) * | 2019-10-28 | 2019-12-31 | 刘小江 | Multistage heating and thermal cycle negative pressure evaporation type solution concentration device |
| CN110624265B (en) * | 2019-10-28 | 2024-06-07 | 黄国和 | Multistage heating and thermal cycle negative pressure evaporation type solution concentration device |
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| Publication number | Publication date |
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| CN105435480B (en) | 2017-07-11 |
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