CN214880336U

CN214880336U - Low-temperature disc type evaporation system

Info

Publication number: CN214880336U
Application number: CN202121136952.8U
Authority: CN
Inventors: 路建伟; 刘威; 张扬洋
Original assignee: Kunshan Wsd Environmental Protection Equipment Co ltd
Current assignee: Kunshan Wsd Environmental Protection Equipment Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-11-26
Anticipated expiration: 2031-05-26

Abstract

The invention provides a low-temperature disc evaporation system, which comprises: a vacuum evaporation tank, wherein an evaporation chamber is formed inside the vacuum evaporation tank; the evaporation disc is arranged in the evaporation chamber and the inside of the evaporation disc is hollow; a scraper for scraping off evaporation residues formed on the surface of the evaporation tray; the hollow shaft drives the evaporation disc to rotate, and the hollow shaft is communicated with the inside of the evaporation disc so as to be introduced with a heat source; the stock solution supply device is used for spraying stock solution to be evaporated to the surface of the evaporation disc; stock solution pressure relief device, it is right to be used for vacuum evaporation jar decompression, stock solution pressure relief device includes decompression mechanism and the liquid storage pot through pipeline circulation series connection, decompression mechanism passes through the pipeline and is connected with vacuum evaporation jar. So set up, but greatly reduced stoste required temperature of evaporation improves evaporation efficiency by a wide margin, has saved evaporation system's energy consumption moreover, when reinforcing evaporation efficiency greatly reduced the running cost of this system.

Description

Low-temperature disc type evaporation system

Technical Field

The invention relates to the technical field of evaporation, in particular to a low-temperature disc type evaporation system.

Background

The disc evaporation technology is an efficient and environment-friendly energy-saving technology, and can be widely applied to the industrial production fields of chemical industry, seawater desalination, sewage treatment and the like. Take sewage treatment as an example, after steam evaporation, can follow and draw out the distilled water that accords with emission standard from the sewage, this distilled water can directly discharge, and remaining evaporation residue is collected again and is carried out centralized processing and can the greatly reduced sewage treatment cost of enterprise. In addition, the disc type evaporation has the advantages of large heat exchange area, high evaporation efficiency, timely collection of evaporation residues and the like, so that the disc type evaporation is favored by users.

The conventional disc type evaporation device generally supplies heat by directly using an external steam heat source, and the evaporation temperature is high, the efficiency is low, the energy consumption is high, so that the energy consumption of an evaporation system is high, and the operation cost of the system is high. And the steam generated by the surface evaporation of the sewage is not effectively recycled, so that the energy waste is caused.

Therefore, it is necessary to design a low-temperature disc evaporation system to solve the above problems.

Disclosure of Invention

The invention aims to provide a low-temperature disc type evaporation system with low energy consumption and high evaporation efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme: a cryogenic disc vaporization system, comprising:

a vacuum evaporation tank, wherein an evaporation chamber is formed inside the vacuum evaporation tank;

the evaporation disc is arranged in the evaporation chamber and the inside of the evaporation disc is hollow;

a scraper for scraping off evaporation residues formed on the surface of the evaporation tray;

the hollow shaft drives the evaporation disc to rotate, and the hollow shaft is communicated with the inside of the evaporation disc so as to be introduced with a heat source;

the stock solution supply device is used for spraying stock solution to be evaporated to the surface of the evaporation disc;

stock solution pressure relief device, it is right to be used for vacuum evaporation jar decompression, stock solution pressure relief device includes decompression mechanism and the liquid storage pot through pipeline circulation series connection, decompression mechanism passes through the pipeline and is connected with vacuum evaporation jar.

As a further improved technical scheme of the invention, the pressure reducing mechanism comprises a centrifugal pump and an ejector, the centrifugal pump is provided with a water inlet end and a water outlet end, the ejector is provided with a water inlet end, a gas suction end and a water outlet end, the water inlet end of the centrifugal pump is connected with the lower part of the liquid storage tank, the water outlet end of the centrifugal pump is connected with the water inlet end of the ejector, the water outlet end of the ejector is connected with the upper part of the liquid storage tank, and the gas suction end of the ejector is connected with the vacuum evaporation tank.

As a further improved technical scheme, the system also comprises a first heat exchanger, wherein the first heat exchanger is arranged between the vacuum evaporation tank and the liquid storage pressure reducing device so as to cool steam generated by evaporation of stock solution, and the liquid storage tank is used for collecting distilled water generated by cooling of the steam.

As a further improved technical scheme of the invention, the steam-purifying device further comprises a spiral separator for purifying steam generated by the vacuum evaporation tank, wherein the spiral separator is arranged between the vacuum evaporation tank and the first heat exchanger, and the first heat exchanger is a plate heat exchanger.

The invention further comprises a circulating cooling device for cooling the distilled water in the liquid storage tank, wherein the circulating cooling device comprises a distilled water pump and a second heat exchanger, and the distilled water is pumped into the second heat exchanger from the bottom of the liquid storage tank and flows back from the upper part of the liquid storage tank after heat exchange.

As a further improved technical scheme of the invention, the second heat exchanger is a plate heat exchanger.

As a further improved technical scheme of the invention, the heat source is steam, and the heat source supply device comprises a steam inlet pipeline, a steam pressure gauge arranged on the steam inlet pipeline and a steam inlet valve.

The invention further provides a further improved technical scheme, which further comprises a material discharging device, wherein the material discharging device comprises a machine barrel with a collecting port and a discharging port, a screw driving mechanism and a discharging port sealing device, the collecting port is used for collecting evaporation residues falling from an evaporation disc, the discharging port sealing device comprises a sealing plug and an elastic abutting mechanism, the sealing plug is arranged on the outer side of the discharging port and seals the discharging port, and the elastic abutting mechanism abuts against the sealing plug towards the discharging port.

As a further improved technical scheme of the invention, the elastic abutting mechanism is an air cylinder, and the sealing plug is arranged at the end part of a piston rod of the air cylinder; the end, facing the discharge port, of the sealing plug is provided with a conical surface, and the discharge port is provided with an inverted conical surface matched with the conical surface of the sealing plug.

As a further improved technical scheme of the invention, the stock solution supply device comprises a solution inlet pipeline, a solution inlet pump and a stock solution spray head; the low-temperature disc type evaporation system further comprises a stock solution circulating device, wherein the stock solution circulating device comprises a stock solution recovery tank and a stock solution circulating tank which are connected through a pipeline, the stock solution recovery tank is positioned below the evaporation disc to collect redundant stock solution on the evaporation disc, the stock solution circulating tank is connected with the liquid inlet pump, and the stock solution is sucked into the stock solution circulating tank by the negative pressure of the vacuum evaporation tank and is pumped into the stock solution nozzle through the liquid inlet pump.

According to the technical scheme, the liquid storage and pressure reduction device is arranged to reduce the pressure of the vacuum evaporation tank and provide negative pressure for the vacuum evaporation tank, so that on one hand, the temperature required by the evaporation process is reduced, the steam consumption is further reduced, and the energy consumption of the low-temperature disc type evaporation system is saved, on the other hand, the negative pressure environment can provide suction for the supply of the stock solution, the power required by the supply of the stock solution is reduced, and the running cost of the system is reduced while the evaporation efficiency is enhanced.

Drawings

Fig. 1 is a schematic structural diagram of a low-temperature tray evaporation system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the circulation of the feed solution in the low temperature tray vaporization system according to one embodiment of the present invention.

Fig. 3 is a connection diagram of the centrifugal pump and the ejector in fig. 1.

Fig. 4 is a schematic structural view of the material discharge apparatus of fig. 2.

FIG. 5 is a schematic structural view of a material discharge apparatus according to another embodiment

FIG. 6 is a diagram showing the position relationship between the scraper and the raw liquid nozzle on one side of the evaporation pan according to an embodiment of the present invention.

FIG. 7 is a diagram showing the positional relationship between the doctor blade and the raw liquid spray head on the other side of the evaporation pan in FIG. 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, a cryogenic disc vaporization system includes: the device comprises a vacuum evaporation tank 1, an evaporation tray 2, a scraper 3, a hollow shaft 4, a stock solution supply device 10, a heat source supply device and a liquid storage and pressure reduction device. An evaporation chamber is formed in the vacuum evaporation tank 1, and the evaporation tray 2 is arranged in the evaporation chamber and is hollow inside. The hollow shaft 4 is horizontally arranged in the vacuum evaporation tank 1, two ends of the hollow shaft 4 penetrate out of the vacuum evaporation tank 1, and the hollow shaft 4 is driven by the speed reducer 41 and drives the evaporation disc 2 to rotate. In this embodiment, the number of the evaporation pan 2 is plural, the plural evaporation pan 2 are arranged along the axial direction of the hollow shaft 4, and the hollow shaft 4 is communicated with the inside of the evaporation pan 2.

The heat source supply means communicates with the hollow shaft 4 and the evaporation pan 2 to supply a heat source thereto. In this embodiment, the heat source is preferably steam, and the steam is converted into a mixture of steam and distilled water after heat exchange through the hollow shaft 4 and the evaporation pan 2, and is discharged from the other end of the hollow shaft 4. The heat source supply device comprises a steam flow meter 11, a steam pressure gauge 12, a steam pressure reducing valve 13, a steam inlet valve 14, a steam pressure gauge 15 and a flange stop valve 16 which are arranged in sequence. The amount of steam and the steam pressure introduced into the hollow shaft 4 are adjusted by the steam flow meter 11 and the steam pressure reducing valve 13, and the heat stability is maintained. Furthermore, in order to ensure the stability of the steam entering the hollow shaft 4 and the evaporation pan 2, a drain valve 17 is further provided at the front end of the steam inlet valve 14 to separate the condensed water in the steam. In other embodiments, other heat exchange media can be selected as the heat source.

Referring to fig. 1 and 3, the liquid storage and pressure reduction device includes a centrifugal pump 301, an ejector 302, and a liquid storage tank 30. The centrifugal pump 301 and the ejector 302 constitute a decompression mechanism for decompressing the vacuum evaporation tank 1. The centrifugal pump 301 has a water inlet end 3011 and a water outlet end 3012, the water inlet end 3011 is connected to the lower portion of the liquid storage tank 30, and the water outlet end 3012 is connected to the ejector 302. Specifically, the ejector 302 has a water inlet port 3021, a suction port 3022, and a water outlet port 3023. The water outlet end 3012 of the centrifugal pump 301 is connected with the water inlet end 3021 of the ejector 302, and the water outlet end 3023 of the ejector 302 is connected with the upper part of the liquid storage tank 30.

A first heat exchanger 5 is further arranged between the liquid storage pressure reducing device and the vacuum evaporation tank 1 to cool steam generated by evaporation of the stock solution, and the suction end 3022 of the ejector 302 is connected with a distilled water outlet of the first heat exchanger 5. The liquid storage tank 30 is communicated with the vacuum evaporation tank 1 through a centrifugal pump 301 and an ejector 302, and is used for providing working liquid required by the ejector 302 on one hand and collecting vapor obtained by evaporation on the other hand. The steam is sucked into the first heat exchanger 5 for cooling under the action of the centrifugal pump 301 and the ejector 302, so as to form a steam and distilled water mixture, and then enters the liquid storage tank 30 through the suction end 3022 and the water outlet end 3012 of the ejector 302.

During the evaporation process, the ejector 302 continuously extracts steam from the vacuum evaporation tank 1 through the pipeline under the action of the centrifugal pump 301, so that a negative pressure state can be formed in the vacuum evaporation tank 1. Preferably, the pressure in the vacuum evaporator 1 is from-90 kPa to-100 kPa, and in this pressure range, the temperature required for evaporation of the stock solution is only from 35 ℃ to 40 ℃. Therefore, the "low temperature" in the low temperature tray evaporation system of the present invention does not mean that the temperature in the vacuum evaporation tank 1 is low at the time of evaporation, but means that the temperature required for evaporation is low. Preferably, the pressure in the vacuum evaporator 1 is set to-96 Kpa, and the temperature required for evaporating the stock solution is 37 ℃. So set up, greatly reduced the required temperature of stoste evaporation, and then improved evaporation efficiency. A multi-point level sensor is arranged in the liquid storage tank 30 and is used for monitoring the distilled water amount in the liquid storage tank 30.

The stock solution supply device 10 is used for spraying stock solution to be evaporated to the surface of the evaporation tray 2, and the stock solution on the surface of the evaporation tray 2 is evaporated by heat to generate steam and evaporation residues. The scraper 3 is used to scrape off evaporation residue formed on the surface of the evaporation pan 2. Specifically, the raw liquid supply device 10 includes a liquid inlet pump 101, a liquid inlet pipeline 102, and a raw liquid spray head 103. Both sides of the evaporation pan 2 are provided with a stock solution spray head 103 and a scraper 3.

Referring to fig. 4 and 5, in the present embodiment, the raw liquid spray head 103 is disposed near the axis of the evaporation pan 2, and the scraper 3 and the raw liquid spray head 103 are both disposed at the lower half portion of the evaporation pan 2 and are disposed at the left and right sides of the evaporation pan 2. Specifically, the axis of the evaporation pan 2 is taken as the origin, a transverse line passing through the axis is taken as a transverse axis, a longitudinal line passing through the axis is taken as a longitudinal axis, the transverse axis and the longitudinal axis divide the evaporation pan 2 into four quadrants, the evaporation pan 2 rotates counterclockwise when viewed from one side of the evaporation pan 2, the stock solution spray head 103 is located in the fourth quadrant, and the scraper 3 is located in the third quadrant; when viewed from the other side of the evaporation pan 2, the evaporation pan 2 rotates clockwise, the stock solution ejection head 103 is located in the third quadrant, and the doctor blade 3 is located in the fourth quadrant. During evaporation, the evaporation disc 2 is driven by the hollow shaft 4 to rotate at a slow speed, the stock solution is continuously sprayed on the disc surfaces on the two sides of the evaporation disc 2 to evaporate and generate evaporation residues, and the scraper 3 scrapes the evaporation residues.

Referring to fig. 1 to 3, preferably, the low-temperature tray evaporation system further includes a raw liquid circulation device 20, the raw liquid circulation device 20 includes a raw liquid recovery tank 201 and a raw liquid circulation tank 202 connected by a pipeline, the raw liquid recovery tank 202 is located below the evaporation pan 2 to collect excess raw liquid on the evaporation pan 2, and the raw liquid circulation tank 201 is connected to the liquid inlet pump 101, that is, the raw liquid recovery tank 201, the raw liquid circulation tank 202, the liquid inlet pump 101, the liquid inlet pipeline 102 and the raw liquid spray head 103 form a raw liquid circulation loop.

Referring to fig. 1, the cryogenic disc vaporization system further includes a spiral separator 71. The vapor evaporated from the stock solution in the vacuum evaporation tank 1 carries part of the liquid and solid impurities, the mixture firstly enters the spiral separator 71, when the mixture contacts with the spiral blade of the spiral separator 71, the liquid and solid impurities in the mixture attach to the surface of the spiral blade and flow down along the surface of the spiral blade, the vapor therein spirally upwards and gradually separates out, and the purification of the vapor is completed in the spiral separator 71. The spiral separator 71 is also externally connected with a defoaming device 9, the defoaming device 9 is used for providing defoaming agent into the spiral separator 71, and a defoaming agent inlet valve 91 is also arranged between the defoaming device 9 and the spiral separator 71.

When the vacuum evaporation tank works, a certain amount of water is firstly stored in the liquid storage tank 30, the centrifugal pump 301 starts to continuously operate, the water in the liquid storage tank 30 is continuously pumped to the ejector 302, the ejector 302 continuously pumps the air in the vacuum evaporation tank 1 away, after a certain time, the vacuum evaporation tank 1 reaches a set negative pressure value, the steam valve 16 and the raw liquid valve 21 are opened, and the speed reducer 41 is started to drive the hollow shaft 4 and the evaporation disc 2 to rotate.

On one hand, after passing through a steam pressure reducing valve 13 from a pipeline, steam enters the hollow shaft 4 and enters the evaporation disc 2 for evaporation of stock solution; the initial steam is divided into the hollow shaft 4 and the evaporation disc 2, and the other part is converted into hot water through a drain valve 17 and enters a steam discharge liquid storage tank 60; the steam used by the hollow shaft 4 and the evaporation disc 2 is converted into hot water by the steam outlet valve 19 and the drain valve 18 and also enters the steam discharge liquid storage tank 60; the pump 601 continuously discharges hot water.

On the other hand, the stock solution enters the stock solution circulating tank 20 through the solution inlet pipeline 102 under the action of suction force generated by negative pressure in the vacuum evaporation tank 1, and simultaneously the solution inlet pump 101 starts to operate continuously, so that the stock solution is pumped to the stock solution spray head 103 and then sprayed to the disc surface of the evaporation disc 2 for evaporation; the steam generated by the evaporation of the stock solution enters the spiral separator 71, the impurities and the stock solution droplets in the steam are separated by the separation effect of the steam, the purified steam enters the first heat exchanger 5 for heat exchange, the temperature of the steam after heat exchange is reduced to be distilled water, and the distilled water is continuously pumped into the liquid storage tank 30 by the centrifugal pump 301. Normal-temperature water serving as a heat exchange medium is continuously introduced into the first heat exchanger 5, and the normal-temperature water absorbs heat of the steam and then flows out.

In order to further cool the hot water in the liquid storage tank 30 to ensure the stable operation of the centrifugal pump 301, a circulating cooling device is arranged to further cool the distilled water. The circulating cooling device comprises a distilled water extracting pump 304 and a second heat exchanger 6. The distilled water pumping pump 304 is started to pump the distilled water in the liquid storage tank 30 to the second heat exchanger 6; normal-temperature water serving as a heat exchange medium is continuously introduced into the second heat exchanger 6, and the normal-temperature water absorbs the heat of the distilled water and then flows out of the second heat exchanger 6; the distilled water is reduced in temperature after heat exchange and flows back to the liquid storage tank 30. In addition, the storage tank 30 is further provided with a drain pump 305 for periodically draining the distilled water after the temperature of the storage tank 30 is reduced, and the drain port of the storage tank 30 is lower than the outlet for pumping out the distilled water by the distilled water pumping pump 304. In this embodiment, the temperature of the distilled water finally discharged after the steam generated by the evaporation of the stock solution is cooled by the first heat exchanger 5 and the second heat exchanger 6 is 40 ℃ to 50 ℃.

In this embodiment, the first heat exchanger 5 and the second heat exchanger 6 are preferably plate heat exchangers, and the second heat exchanger 6 is disposed outside the liquid storage tank 30, so that the installation and the maintenance are convenient. In other embodiments, the second heat exchanger may also be a coil heat exchanger located in the liquid storage tank, and of course, the heat exchange medium introduced into the second heat exchanger may also be selected as another heat exchange medium, and is not limited to normal-temperature water. In this embodiment, the heat exchange media in the first heat exchanger 5 and the second heat exchanger 6 both adopt normal temperature water, and normal temperature water is more easily obtained than other heat exchange media, and does not produce any pollution, and the recovery is also more convenient.

Referring to fig. 1 and 2, the low temperature tray evaporation system further includes a material discharging device 40 for discharging the evaporation residue scraped off by the scraper 3 out of the vacuum evaporation tank 1. Referring to fig. 6, the material discharge device 40 includes a cylinder 401 having a collection port 4011 and a discharge port 4012, a screw 402, a screw driving mechanism 403, and a discharge port sealing device. The collection port 4011 is connected with the tank body of the vacuum evaporation tank 1 in a sealing way and is used for collecting evaporation residues falling from the evaporation tray 2. Referring to fig. 4, preferably, a guide plate 11 is further disposed between the collection port 4011 and the canister body of the vacuum evaporation canister 1, the guide plate 11 is disposed obliquely below the scraper 3, and a lower end of the guide plate 11 is connected to the collection port 4011 to guide the evaporation residue scraped off by the scraper 3 into the collection port 4011.

The discharge port 4012 is located outside the vacuum evaporation can 1, and is used for discharging the evaporation residue out of the vacuum evaporation can 1. The cylinder 401 is substantially cylindrical and extends in the direction of arrangement of the evaporation pan 2, and the screw 402 is provided inside the cylinder 401. The barrel 401 is divided into a collecting section and an extruding section in the axial direction of the screw 402. The collecting port 4011 is opened at the collecting section and is arranged corresponding to the scraper 3.

The utility model discloses in, collect mouthful 4011 and be a continuous rectangular shape opening, the evaporation residue that a plurality of scrapers 3 scraped is collected by this collection mouthful 4011. In other embodiments, as shown in fig. 7, a plurality of collecting ports 4011 'may be provided at intervals, and a plurality of collecting ports 4012' correspond to the plurality of blades 3, respectively. The rear end of the cylinder 401 (the front end in the screw extrusion direction) is an extrusion section, and the discharge port 4012 is located at the end of the extrusion section. The extruded section of barrel 401 is a full cylinder whose wall cooperates with screw 402 for providing radially inward pressure and axially forward thrust to the evaporative residue.

The outlet port sealing means serves to dynamically seal the outlet port 4012. Specifically, as shown in fig. 6, the discharge port sealing device includes a sealing plug 404 and an elastic pressing mechanism 405, the sealing plug 404 is disposed outside the discharge port 4012 and seals the discharge port 4012, the elastic pressing mechanism 405 presses the sealing plug 404 toward the discharge port 4012, and when the screw 402 discharges the evaporation residue, the thrust of the evaporation residue on the sealing plug 404 is greater than the acting force of the elastic pressing mechanism 405 on the sealing plug 404.

Preferably, the elastic pressing mechanism 405 is an air cylinder, and the sealing plug 404 is disposed at an end of a piston rod of the air cylinder. Preferably, the end of the sealing plug 404 facing the outlet 4012 is provided with a tapered surface 4041, and the outlet 4012 is provided with an inverted conical surface matching the tapered surface 4041 of the sealing plug 404. In this embodiment, the sealing plug 404 is made of an elastic material, preferably a rubber material, so as to increase the sealing property.

In summary, the low-temperature disc evaporation system of the present invention has the following advantages:

1. the first heat exchanger is communicated with the vacuum evaporation tank, so that the steam generated by evaporation is cooled, and the collection is convenient; the vacuum evaporation tank is further decompressed through the decompression mechanism, negative pressure is provided for the vacuum evaporation tank, the temperature required in the evaporation process is reduced, the steam consumption is further reduced, the energy consumption of the low-temperature disc type evaporation system is saved, in addition, the negative pressure environment can provide suction for the supply of stock solution, the power required by the supply of part of the stock solution is saved, the evaporation efficiency is enhanced, and the operation cost of the system is reduced;

2. the second heat exchanger is communicated with the liquid storage tank, so that distilled water generated by evaporation of the stock solution is further cooled, on one hand, the operation of the pressure reducing mechanism is stable, the influence on the operation and the service life of a centrifugal pump and an ejector due to overhigh distilled water temperature is prevented, on the other hand, the outlet water temperature of the low-temperature disc type evaporation system meets the discharge or reuse standard, and after the temperature is reduced, the distilled water discharge and storage device can adopt a conventional device without adopting a high-temperature resistant device, so that the cost of equipment is saved, the operation safety of the system is improved, and an operator is prevented from being scalded;

3. the evaporation tray is arranged, so that the heat exchange area of the stock solution during evaporation is increased, the evaporation efficiency is high, evaporation residues can be timely collected through the scraper, evaporation can be continuously performed, and the influence of accumulation of the evaporation residues on the heat exchange efficiency is prevented;

4. through setting up the material eduction gear who adapts to vacuum environment, in time discharge the vacuum evaporation jar with the evaporation residue when guaranteeing vacuum evaporation jar in vacuum evaporation jar for low temperature disc evaporation system sustainable operation further improves the evaporation efficiency of this system and the handling capacity of stoste.

The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the technical field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the technical field should understand that the technical personnel in the technical field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.

Claims

1. A cryogenic disc vaporization system comprising:

2. The system of claim 1, wherein the pressure reducing mechanism comprises a centrifugal pump having a water inlet end and a water outlet end, and an ejector having a water inlet end, a suction end, and a water outlet end, the water inlet end of the centrifugal pump being connected to the lower portion of the reservoir, the water outlet end of the centrifugal pump being connected to the water inlet end of the ejector, the water outlet end of the ejector being connected to the upper portion of the reservoir, the suction end of the ejector being connected to the vacuum evaporation tank.

3. The system according to claim 1, further comprising a first heat exchanger disposed between the vacuum evaporation tank and the liquid storage and pressure reduction device for cooling the steam generated by evaporation of the stock solution, wherein the liquid storage tank is used for collecting the distilled water generated by cooling the steam.

4. A cryogenic disc vaporization system according to claim 3 further comprising a spiral separator for purifying vapor produced by the vacuum vaporization tank, the spiral separator being disposed between the vacuum vaporization tank and the first heat exchanger, the first heat exchanger being a plate heat exchanger.

5. The low-temperature disc evaporation system according to claim 1, further comprising a circulating cooling device for cooling the distilled water in the liquid storage tank, wherein the circulating cooling device comprises a distilled water pump and a second heat exchanger, and the distilled water is pumped into the second heat exchanger from the bottom of the liquid storage tank and flows back from the upper part of the liquid storage tank after heat exchange.

6. A cryogenic disc vaporization system according to claim 5 wherein the second heat exchanger is a plate heat exchanger.

7. The system according to claim 1, wherein the heat source is steam, and the heat source supply device comprises a steam inlet pipeline, a steam pressure gauge arranged on the steam inlet pipeline, and a steam inlet valve.

8. A cryogenic disc vaporization system according to claim 1, further comprising a material removal device comprising a barrel having a collection port for collecting evaporative residue falling from the evaporative disc and a discharge port, a screw drive mechanism, and a discharge port seal, the discharge port seal comprising a sealing plug disposed outside the discharge port and sealing the discharge port, and an elastic biasing mechanism biasing the sealing plug toward the discharge port.

9. The system according to claim 8, wherein the elastic pressing mechanism is a cylinder, and the sealing plug is arranged at the end of a piston rod of the cylinder; the end, facing the discharge port, of the sealing plug is provided with a conical surface, and the discharge port is provided with an inverted conical surface matched with the conical surface of the sealing plug.

10. The system of claim 1, wherein the raw liquid supply device comprises a liquid inlet pipeline, a liquid inlet pump and a raw liquid spray head; the low-temperature disc type evaporation system further comprises a stock solution circulating device, wherein the stock solution circulating device comprises a stock solution recovery tank and a stock solution circulating tank which are connected through a pipeline, the stock solution recovery tank is positioned below the evaporation disc to collect redundant stock solution on the evaporation disc, the stock solution circulating tank is connected with the liquid inlet pump, and the stock solution is sucked into the stock solution circulating tank by the negative pressure of the vacuum evaporation tank and is pumped into the stock solution nozzle through the liquid inlet pump.