CN212039073U

CN212039073U - Corrosion-resistant vacuum distillation device

Info

Publication number: CN212039073U
Application number: CN201922368153.2U
Authority: CN
Inventors: 廖辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-12-01
Anticipated expiration: 2029-12-25

Abstract

The utility model discloses a corrosion-resistant vacuum distillation device, include: the distillation retort has the functions of heating and evaporation and comprises a heating cavity and an evaporation cavity, and is provided with an interface which is directly communicated from the outside of the distillation retort to the inside of the evaporation cavity and is respectively a waste liquid inlet, an exhaust port and a kettle residue discharge port; and the condensation recovery device is used for sucking air and evaporation gas generated by heating the waste liquid from the interior of the distillation retort and creating a reduced pressure environment for the distillation retort. The beneficial effects of the utility model are that, just considering current waste liquid treatment device processing technology complicacy at the beginning of the design, producing derivatives such as mud, the problem that treatment cost is high is integrated retort and heater as an organic whole, has simplified process flow, has reduced the shared space of equipment, has still saved the medicament use expense, and is more economical and efficient, environmental protection and energy saving.

Description

Corrosion-resistant vacuum distillation device

Technical Field

The utility model relates to an evaporation splitter of corrosivity waste liquid, concretely relates to corrosion-resistant vacuum distillation plant.

Background

In the industrial waste liquid treatment process, a plurality of waste liquids with strong corrosiveness are generated.

For example, in the metal surface treatment industry, a large amount of phosphoric acid, sulfuric acid, is used. A large amount of acidic waste liquid is generated in links such as cleaning, and a large amount of chemicals are required to be added in the traditional water treatment process for neutralization, flocculation, precipitation and filter pressing to become solid waste. The use of chemicals increases the investment of treatment cost, and the complex process flow requires a large field and construction cost.

For example, a large amount of valuable metal elements exist in the electroplating waste liquid, and if the effective components are too low, the valuable metal elements are difficult to be recovered, so that the waste of resources is caused.

For example, the biological treatment process of the high-salt-content waste liquid is basically the same as the common biological treatment process, and mainly comprises a regulating tank, an aeration tank, a secondary sedimentation tank, sludge reflux, residual sludge dehydration, nutrient salt adding and the like.

The treatment method for certain corrosive waste liquid needs a means of chemical adding reaction or biological removal, the treatment process is complex, sludge and other derivatives are generated, the burden of enterprises is increased, and the environment is damaged. Therefore, the environmental protection industry is in urgent need of an integrated water treatment device which is highly integrated, economical and efficient, does not need to invest a large amount of site construction cost and has no complex process flow architecture.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a high integration, economy is high-efficient, the simple decompression distillation plant of process flow.

In order to achieve the above purpose, the technical solution of the present invention is as follows:

a corrosion resistant reduced pressure distillation apparatus comprising: the distillation retort has the functions of heating and evaporation and comprises a heating cavity and an evaporation cavity, wherein the heating cavity and the evaporation cavity are mutually independent in the distillation retort, the heating cavity provides a heat source for the evaporation cavity, the distillation retort is provided with an interface which is directly communicated from the outside of the distillation retort to the inside of the evaporation cavity, and the interface is respectively a waste liquid inlet which is positioned at the top of the distillation retort and close to the side surface, an exhaust port which is far away from the waste liquid inlet and is also positioned at the top of the distillation retort, and a still residue discharge port which is arranged at the bottom of the distillation retort; and the condensation recovery device is used for sucking air and evaporation gas generated by heating the waste liquid from the inside of the distillation retort, and creating a reduced pressure environment for the distillation retort while condensing and recovering the evaporation gas.

The beneficial effects of the utility model are that, compare with current waste liquid treatment device, the vacuum distillation device among this technical scheme just considers current waste liquid treatment device processing technology complicated just before the design, produces derivatives such as mud, the problem that the treatment cost is high, integrate retort and heater as an organic whole, simplified process flow, reduced the shared space of equipment, still saved the medicament use expense to when having realized that vacuum distillation device is satisfying practical requirement among this technical scheme, more economical and efficient, environmental protection and energy saving.

On the basis of the technical scheme, the following improvements can be made:

furthermore, the evaporation cavity is completely arranged in the heating cavity, and effective heating spaces are formed in the heating cavity except the space occupied by the evaporation cavity. The technical scheme of wrapping the evaporation cavity inside the evaporation cavity enables the evaporation cavity to be heated in all directions, the heating uniformity is excellent, and the heat energy is utilized more fully.

Further, still include agitating unit, agitating unit divide into install in the agitator motor at retort top with stretch into the evaporation intracavity and with the stirring portion that agitator motor directly links, stirring portion is in by (mixing) shaft and dislocation arrangement epaxial doctor-bar is constituteed, stirring portion is in stir the waste liquid of boiling under agitator motor's the drive, on the one hand evaporation with higher speed, on the other hand prevents the evaporation intracavity wall scale deposit. The arrangement of the stirring device in the distillation retort effectively solves the problems that the evaporation speed is low when the concentration of the waste liquid is high, and the dirt on the wall of the distillation retort is difficult to clean, and the maintenance period of the distillation retort is greatly prolonged.

Further, agitator motor is the inverter motor who has the converter, and when the viscosity of waste liquid is different, or when waste liquid concentration increases, through the converter adjustment agitating unit's stirring speed to the needs of the different viscosity waste liquids of adaptation stirring. The viscosity of different waste liquids is different, and along with the evaporation phenomenon in the distillation retort is continuously gone on, the concentration of waste liquid is also changing step by step, and the speed that needs the stirring will also be different for the change of viscosity and concentration, and the configuration of converter will adjust as required the frequency of agitator motor to the suitable stirring speed that the adaptation is required to the liquid of present state.

Further, the evaporation chamber material is clad steel plate, clad steel plate both sides are corrosion-resistant steel and ordinary steel respectively, the inside and waste liquid contact part of evaporation chamber do corrosion-resistant steel, the evaporation chamber outside is close to one side in heating chamber is ordinary steel. The composite steel plate can meet the requirement of distilling highly corrosive waste liquid, and the magnetic conductivity of the cavity of the evaporation cavity is kept, so that the double purposes are achieved. The application of the composite steel plate makes the treatment of the waste liquid with certain corrosiveness by adopting a direct reduced pressure distillation mode possible. In addition, the evaporation chamber material can also be made according to different resistant materials of different waste liquid selections, for example: the phosphoric acid sulfuric acid waste liquid can be made of a stainless steel material (SUS904L) and a common steel composite plate in the acid making industry, and when the phosphoric acid sulfuric acid waste liquid is evaporated and concentrated, the concentrated solution reaches a certain concentration, so that the waste acid can be recycled.

Further, the heating mode of retort is electromagnetic induction heating, the heating chamber outside is equipped with electromagnetic induction heater, electromagnetic induction heater utilizes the electromagnetic induction heating principle and ordinary steel magnetic conductivity, for the evaporation of evaporation intracavity waste liquid provides the heat source. The use of the electromagnetic induction heater is beneficial to reducing the configuration of a supply pipeline of the distillation retort, and the distillation retort can be heated only by electric energy.

Furthermore, the heat source of retort is the steam that is only used for the heating the side that the heating chamber outside is close to the top surface is equipped with the heating steam entry, is equipped with the heating steam export near the side of bottom surface, steam is followed the heating steam entry gets into the heating chamber provides the omnidirectional heating environment for putting the evaporation chamber in the heating chamber, follows at last the heating steam export flows to accomplish heating process. Steam heating is another relatively clean heating mode for heating the distillation tank, and compared with the electromagnetic induction heating, the steam heating has the defects that a pipe needs to be arranged, the heating power is difficult to adjust, and the steam heating is more suitable for users with waste heat recycling.

Further, the condensation recovery apparatus includes: the condenser is used for cooling evaporation gas generated by heating and evaporating the waste liquid by utilizing external circulating cooling water; a vapor-liquid separator for separating liquid condensed by the condenser and evaporated gas which is not condensed; the vacuum pump is used for providing power for the evaporated gas and the air to enter the condenser and creating a reduced pressure environment for the inside of the evaporation cavity; a distilled water receiving barrel for collecting the liquid separated from the vapor-liquid separator; the connecting pipe is used for connecting the condenser, the vapor-liquid separator, the vacuum pump, the distilled water containing barrel and the distillation retort; and the control valve is arranged on the connecting pipe and used for controlling the flow direction of the evaporation gas and the liquid. The evaporation separation of the waste liquid is carried out in the reduced pressure environment, the boiling point of the waste liquid can be effectively reduced, and compared with the evaporation separation under normal pressure, the corrosion of the waste liquid to an evaporation cavity can be reduced, and more energy is saved.

Further, condensation recovery unit still includes steam filter, steam filter is used for filtering macromolecular material and impurity in the produced low temperature vapor of waste liquid low temperature evaporation to protection condenser and rear end mechanism. The arrangement of the steam filter is beneficial to removing harmful substances in the steam, so that the distilled water can reach the environmental protection standard.

Furthermore, the vacuum distillation device also comprises an automatic control unit, a temperature sensor and a pressure sensor are arranged on the distillation tank, a control valve on the connecting pipe is an electric control valve, the temperature sensor, the pressure sensor, the electromagnetic induction heater, the stirring motor, the condenser, the vacuum pump and the electric control valve are all provided with control leads and connected with the automatic control unit, the temperature sensor and the pressure sensor respectively transmit a temperature signal and a pressure signal in the distillation tank to the automatic control unit, the automatic control unit judges whether the temperature or the pressure in the distillation tank exceeds a preset range according to the received temperature signal, if the temperature or the pressure in the distillation tank exceeds the preset range, a frequency modulation working instruction is issued to the electromagnetic induction heater or the stirring motor, or an opening degree instruction of a regulating valve is issued to the electric control valve, thereby realizing the automatic control of the reduced pressure distillation device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the working flow of the vacuum distillation apparatus of the present invention.

Fig. 2 is a schematic structural diagram 1 of the distillation tank of the present invention.

Fig. 3 is a schematic structural diagram 2 of the distillation tank of the present invention.

Fig. 4 is a schematic structural diagram 3 of the distillation tank of the present invention.

The corresponding part names indicated by the numbers in the figures are as follows:

a distillation tank 1; a heating chamber 11; a heating steam inlet 111; a heating steam outlet 112; an evaporation chamber 12; corrosion-resistant steel 121; a common steel material 122; a waste liquid inlet 13; an exhaust port 14; a kettle residue outlet 15; a stirring device 16; a stirring motor 161; a stirring section 162; a stirring shaft 1621; a wiper 1622; an electromagnetic induction heater 17; a temperature sensor 18; a pressure sensor 19; a condensation recovery device 2; a condenser 21; a vapor-liquid separator 22; a vacuum pump 23; a distilled water storage tub 24; a connecting pipe 25; a control valve 26; a vapor filter 27; an automatic control unit 3.

Detailed Description

To facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In order to realize the utility model discloses a purpose, the utility model provides a technical scheme does:

as shown in fig. 1, a corrosion-resistant vacuum distillation apparatus includes: the distillation retort 1 has the functions of heating and evaporation and comprises a heating cavity 11 and an evaporation cavity 12, the heating cavity 11 and the evaporation cavity 12 are mutually independent in the distillation retort 1, the heating cavity 11 provides a heat source for the evaporation cavity 12, the distillation retort 1 is provided with an interface which is directly communicated from the outside of the distillation retort to the inside of the evaporation cavity, and the interface is respectively a waste liquid inlet 13 which is positioned at the top of the distillation retort and close to the side surface, an exhaust port 14 which is far away from the waste liquid inlet and is also positioned at the top of the distillation retort, and a still residue discharge port 15 which is arranged at the bottom of; and the condensation recovery device 2 is used for sucking air and evaporation gas generated by heating waste liquid from the interior of the distillation retort 1, condensing and recovering the evaporation gas and creating a reduced-pressure environment for the distillation retort 1. When the inside of the evaporation cavity 12 is in a reduced pressure environment, the waste liquid external supply pipeline sucks waste liquid into the evaporation cavity 12 through the waste liquid inlet 13 to complete the supply action of the waste liquid. The reduced pressure distillation device in the technical scheme aims to solve the problems that the existing waste liquid treatment device is complex in treatment process, generates derivatives such as sludge and is high in treatment cost, integrates a distillation tank and a heater into a whole, simplifies the process flow, reduces the occupied space of equipment, saves the medicament use cost, meets the practical requirement, and is economical and efficient.

In some embodiments, as shown in fig. 2, the evaporation chamber 12 is completely located in the heating chamber 11, and the heating chamber 11 is an effective heating space except for the space occupied by the evaporation chamber 12. The technical scheme of wrapping the evaporation cavity 12 in the evaporation cavity 11 enables the evaporation cavity 12 to be heated in all directions, the heating uniformity is good, and the heat energy is utilized more fully.

In a preferred embodiment, as shown in fig. 2, the distillation tank 1 further includes a stirring device 16, the stirring device 16 is divided into a stirring motor 161 installed at the top of the distillation tank and a stirring portion 162 extending into the evaporation cavity and directly connected to the stirring motor, the stirring portion 162 is composed of a stirring shaft 1621 and blades 1622 arranged on the stirring shaft in a staggered manner, and the stirring portion 162 is driven by the stirring motor 161 to stir the boiling waste liquid, so as to accelerate evaporation and prevent scaling on the inner wall of the evaporation cavity 12. Particularly, after the continuous evaporation of waste liquid in retort 1, agitating unit 16 stirs in inside always, and the concentration of corrosive substance constantly increases in the waste liquid, reaches predetermined concentration after, abolishes the decompression environment in retort 1, and agitator motor 161 rotates, and (mixing) shaft 1621 drives thick liquid after the scraper 1622 will concentrating in the cavity outside residue discharge port 15 passes through residue discharge device. The arrangement of the stirring device 16 in the distillation retort 1 effectively improves the problems of slow evaporation speed and difficult cleaning of dirt on the cavity wall when the concentration of the waste liquid is high, and greatly prolongs the maintenance period of the distillation retort 1.

In another preferred embodiment, as also shown in fig. 2, the stirring motor 161 is an inverter motor with an inverter, and when the viscosity of the waste liquid is different or the concentration of the waste liquid is increased, the stirring speed of the stirring device 16 is adjusted by the inverter to meet the requirement of stirring the waste liquid with different viscosity. The viscosity of different waste liquids is different, and along with the continuous progress of evaporation phenomenon in retort 1, the concentration of waste liquid is also changing gradually, and the speed that the viscosity and the change of concentration will lead to required stirring also has different, and the configuration of converter will adjust the frequency of agitator motor 161 as required to the suitable stirring speed that the adaptation is required to the liquid of present state.

In another preferred embodiment, as shown in fig. 2, the evaporation cavity 12 is made of a clad steel plate, the two sides of the clad steel plate are made of corrosion-resistant steel 121 and ordinary steel 122, respectively, the portion of the inside of the evaporation cavity 12 contacting the waste liquid is made of corrosion-resistant steel 121, and the side of the outside of the evaporation cavity 12 close to the heating cavity 11 is made of ordinary steel 122. The arrangement of the composite steel plate can meet the requirement of distilling the highly corrosive waste liquid, and the magnetic conductivity of the cavity of the evaporation cavity 12 is kept, so that the double purposes are achieved. The application of the composite steel plate makes the treatment of the waste liquid with certain corrosiveness by adopting a direct reduced pressure distillation mode possible. In addition, the evaporation cavity 12 can be made of different resistant materials according to different waste liquids, for example: the phosphoric acid sulfuric acid waste liquid can be made of a stainless steel material (SUS904L) and a common steel composite plate in the acid making industry, and when the phosphoric acid sulfuric acid waste liquid is evaporated and concentrated, the concentrated solution reaches a certain concentration, so that the waste acid can be recycled.

In still another preferred embodiment, as shown in fig. 3, the heating mode of the distillation retort 1 is electromagnetic induction heating, an electromagnetic induction heater 17 is arranged outside the heating cavity, and the electromagnetic induction heater 17 provides a heat source for evaporating the waste liquid in the evaporation cavity 12 by utilizing the electromagnetic induction heating principle and the magnetic conductivity of common steel. The electromagnetic induction heater 17 comprises an electromagnetic heating coil and an electromagnetic heating module, and under the electromagnetic induction action of the electromagnetic heating coil and the electromagnetic heating module, the common steel 122 on the magnetic conduction layer of the evaporation cavity 12 generates heat, so that the waste liquid in the evaporation cavity is heated. The use of the electromagnetic induction heater 17 is beneficial to reducing the configuration of the supply pipeline of the distillation retort 1, and the distillation retort 1 can be heated only by electric energy.

Corresponding to the electromagnetic induction heating, as shown in fig. 4, the heat source of the distillation retort 1 is steam only used for heating, a heating steam inlet 111 is arranged on the side surface, close to the top surface, outside the heating cavity 12, a heating steam outlet 112 is arranged on the side surface, close to the bottom surface, steam enters the heating cavity 11 from the heating steam inlet 111, an omnibearing heating environment is provided for the evaporation cavity 12 arranged in the heating cavity 11, and condensed water formed after the heat exchange of the steam and the composite material of the evaporation cavity 12 and low-temperature steam which is not condensed are discharged through the heating steam outlet 112, so that the heating process is completed. Steam heating is another relatively clean heating method for heating the distillation tank 1, and compared with electromagnetic induction heating, the steam heating has the disadvantages that piping is needed, the heating power is difficult to adjust, and the steam heating is more suitable for users with waste heat recycling.

In practical application, as shown in fig. 1, the condensation recovery apparatus 2 includes: the condenser 21 cools the evaporation gas generated by heating and evaporating the waste liquid by utilizing the condenser 21 which is externally connected with circulating cooling water and enters the tubular heat exchange, thereby condensing the evaporation gas into distilled liquid; a vapor-liquid separator for separating the liquid condensed by the condenser 21 and the evaporated gas which has not been condensed; the vacuum pump 23 is used for providing power for the evaporated gas and air to enter the condenser 21 and creating a reduced pressure environment for the interior of the evaporation cavity 12, when the reduced pressure environment needs to be created for the distillation operation in the evaporation cavity 12, the waste liquid inlet 13 and the kettle residue outlet 15 are both in a closed state, and the vacuum pump 23 continuously operates so as to maintain the reduced pressure environment of the evaporation cavity 12; a distilled water receiving tub 24 for collecting the liquid separated from the vapor-liquid separator 22; a connection pipe 25 for connecting the condenser 21, the vapor-liquid separator 22, the vacuum pump 23, the distilled water storage tub 24 and the distillation tank 1; and a control valve 26 provided on the connection pipe 25 for controlling the flow direction of the evaporation gas and the liquid. Carry out the vaporization separation of waste liquid in the decompression environment, can effectively reduce the boiling point of waste liquid, compare with vaporization separation under the ordinary pressure, can not only reduce the corruption of waste liquid to the evaporation chamber, also more energy-conserving, if: when the vacuum degree reaches (-90) (-80) kPa (relative to one atmosphere), the evaporation temperature of the waste liquid is only about 50 ℃.

In a preferred embodiment, as shown in fig. 1, the condensation and recovery device 2 further comprises a vapor filter 27, wherein the vapor filter 27 is used for filtering macromolecular substances and impurities in low-temperature vapor generated by low-temperature evaporation of the waste liquid, and only the filtered evaporation gas can enter the next step to protect the condenser 21 and the back-end device. The arrangement of the steam filter 27 is helpful for removing harmful substances in the steam, so that the distilled liquid formed by evaporation and condensation reaches the environmental standard.

In still other embodiments, as shown in fig. 1, the vacuum distillation apparatus further includes an automatic control unit 3, the distillation tank 1 is provided with a temperature sensor 18 and a pressure sensor 19, the control valve 26 on the connection pipe 25 is an electric control valve, the temperature sensor 18, the pressure sensor 19, the electromagnetic induction heater 17, the stirring motor 161, the condenser 21, the vacuum pump 23, the electric control valve 26 are all provided with control wires to be connected with the automatic control unit 3, the temperature sensor 18 and the pressure sensor 19 respectively transmit a temperature signal and a pressure signal in the distillation tank 1 to the automatic control unit 3, the automatic control unit 3 determines whether the temperature or the pressure in the distillation tank 1 exceeds a predetermined range according to the received temperature signal, if the temperature or the pressure exceeds the predetermined range, a frequency modulation operation command is issued to the electromagnetic induction heater 17 or the stirring motor 16, or an opening command of an adjusting valve is issued to the electric control, thereby realizing the automatic control of the reduced pressure distillation device.

The above embodiments are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. A corrosion-resistant, reduced pressure distillation apparatus, comprising:

the distillation retort has the functions of heating and evaporation and comprises a heating cavity and an evaporation cavity, wherein the heating cavity and the evaporation cavity are mutually independent in the distillation retort, the heating cavity provides a heat source for the evaporation cavity, the distillation retort is provided with an interface which is directly communicated from the outside of the distillation retort to the inside of the evaporation cavity, and the interface is respectively a waste liquid inlet which is positioned at the top of the distillation retort and close to the side surface, an exhaust port which is far away from the waste liquid inlet and is also positioned at the top of the distillation retort, and a still residue discharge port which is arranged at the bottom of the distillation retort;

and the condensation recovery device is used for sucking air and evaporation gas generated by heating the waste liquid from the inside of the distillation retort, and creating a reduced pressure environment for the distillation retort while condensing and recovering the evaporation gas.

2. A corrosion resistant reduced pressure distillation apparatus according to claim 1, wherein the evaporation chamber is completely disposed within the heating chamber, and the heating chamber is an effective heating space except for a space occupied by the evaporation chamber.

3. The corrosion-resistant reduced pressure distillation device according to claim 2, wherein the distillation tank further comprises a stirring device, the stirring device comprises a stirring motor installed at the top of the distillation tank and a stirring part extending into the evaporation cavity and directly connected with the stirring motor, the stirring part comprises a stirring shaft and scraping pieces arranged on the stirring shaft in a staggered manner, and the stirring part is driven by the stirring motor to stir the boiling waste liquid, so that evaporation is accelerated, and scaling on the inner wall of the evaporation cavity is prevented.

4. The apparatus according to claim 3, wherein the stirring motor is an inverter motor with an inverter.

5. The corrosion-resistant reduced pressure distillation apparatus according to claim 4, wherein the evaporation cavity is made of a composite steel plate, two sides of the composite steel plate are made of corrosion-resistant steel and ordinary steel, the part of the inside of the evaporation cavity, which is in contact with the waste liquid, is made of the corrosion-resistant steel, and one side of the outside of the evaporation cavity, which is close to the heating cavity, is made of the ordinary steel.

6. The corrosion-resistant reduced pressure distillation apparatus according to claim 5, wherein the distillation tank is heated by electromagnetic induction heating, an electromagnetic induction heater is arranged outside the heating chamber, and the electromagnetic induction heater provides a heat source for evaporation of the waste liquid in the evaporation chamber by using an electromagnetic induction heating principle and the magnetic conductivity of the common steel.

7. A corrosion resistant, reduced pressure distillation apparatus according to claim 5, wherein the heat source of said retort is steam for heating only, and wherein a heating steam inlet is provided on the side of the exterior of said heating chamber adjacent to the top surface and a heating steam outlet is provided on the side adjacent to the bottom surface, said steam entering said heating chamber through said heating steam inlet providing an omni-directional heating environment for the evaporation chamber disposed within the heating chamber and finally exiting through said heating steam outlet, thereby completing the heating process.

8. The corrosion-resistant, reduced pressure distillation apparatus of claim 1, wherein the condensate recovery device comprises:

the condenser is used for cooling evaporation gas generated by heating and evaporating the waste liquid by utilizing external circulating cooling water;

a vapor-liquid separator for separating liquid condensed by the condenser and evaporated gas which is not condensed;

the vacuum pump is used for providing power for the evaporated gas and the air to enter the condenser and creating a reduced pressure environment for the inside of the evaporation cavity;

a distilled water receiving barrel for collecting the liquid separated from the vapor-liquid separator;

the connecting pipe is used for connecting the condenser, the vapor-liquid separator, the vacuum pump, the distilled water containing barrel and the distillation retort;

and the control valve is arranged on the connecting pipe and used for controlling the flow direction of the evaporation gas and the liquid.

9. The corrosion-resistant vacuum distillation apparatus according to claim 8, wherein the condensation recovery apparatus further comprises a steam filter for filtering macromolecular substances and impurities in the low-temperature water vapor generated by low-temperature evaporation of the waste liquid to protect the condenser and the rear-end mechanism.

10. The corrosion-resistant vacuum distillation apparatus according to claim 8 or 9, further comprising an automatic control unit, wherein the distillation tank is provided with a temperature sensor and a pressure sensor, the control valve on the connecting pipe is an electric control valve, and the temperature sensor, the pressure sensor, the electromagnetic induction heater, the stirring motor, the condenser, the vacuum pump and the electric control valve are all provided with control wires and connected with the automatic control unit.