Electromagnetic Induction Evaporation Concentrator

Abstract

The present invention belongs to the technical field of evaporation concentrators, and particularly relates to an electromagnetic induction evaporation concentrator, which includes an evaporation chamber, a separator, a first heating device and a second heating device. Both the first heating device and the second heating device include a magnetic conductive circular tube and an induction coil. The induction coil is wound around the magnetic conductive circular tube, and the induction coil is electrically connected to an alternating current induction power supply. The magnetic conductive circular tube of the first heating device is sleeved on the lower part of the evaporation chamber. The secondary steam outlet of the evaporation chamber is communicated with the steam inlet of the separator. The magnetic conductive circular tube of the second heating device is sleeved on the pipeline of the steam outlet of the separator. Beneficial effects: This electromagnetic induction evaporation concentrator omits the compressor, has a low cost, a wider application range, is more energy-efficient than MVR, has higher efficiency, is safe and reliable when evaporating and concentrating organic solvents, has no noise pollution problem, and the silica wool plays a role in sound absorption. It is convenient for replacement and maintenance and has a long service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of evaporation concentrators, and particularly relates to an electromagnetic induction evaporation concentrator. Background Art

[0002] Evaporation concentrators play a very crucial role in the production processes of industries such as traditional Chinese medicine, food, chemical engineering, seawater desalination, and zero liquid discharge of wastewater. In the development history of evaporation concentrators, the most primitive is scattered evaporation to vacuum concentration → single effect → double effect → triple effect → multi-effect → MVR evaporation concentration → heat pump evaporation concentration. From the development history of evaporation concentrators, all are for energy conservation, efficiency improvement, consumption reduction, and emission reduction. Especially, MVR evaporation concentration has obvious improvements in energy conservation, efficiency improvement, and automation.

[0003] For example, traditional evaporation concentrators use steam as the heat source to directly heat the liquid in the heat exchanger. Approximately one cubic meter of steam is required to evaporate one cubic meter of water. To protect the environment, the state has restricted the use of traditional boilers to burn steam and requires the use of natural gas. The cost of one cubic meter of steam is approximately between 350 yuan and 450 yuan; MVR evaporation concentration uses steam to preheat the equipment and the liquid to the evaporation temperature. The water is generally heated to between 95 degrees and 98 degrees. Secondary steam is generated in the evaporation chamber. At this time, the compressor starts to increase the temperature and pressure of the secondary steam in the evaporation chamber. The secondary steam with increased temperature and pressure by the compressor is sent to the shell side of the heater to exchange heat with the liquid in the tube side of the heater. Only a small amount of steam needs to be supplemented during the evaporation process. The cost of MVR evaporation per cubic meter of water is approximately between 32 yuan and 50 yuan. The operating cost of the MVR evaporation concentrator is about one-tenth of that of the traditional evaporation concentrator, with obvious energy conservation, and the floor area of the equipment can also be reduced by more than half.

[0004] However, the existing MVR evaporation concentrators still have the following disadvantages and deficiencies: 1. The one-time investment in equipment is relatively large (compared with traditional evaporators), which is difficult for customers to accept, and the competitive advantage is not obvious; 2. After the secondary steam is compressed by the compressor, its pressure and temperature increase and are sent to the heating chamber of the evaporator as heating steam. The compressor is the core component, and its cost accounts for about one-third of the entire system. Once there are mechanical or electrical failures, the entire system will be paralyzed, with a high failure frequency and a long maintenance and replacement cycle; 3. A large amount of steam is required to preheat the liquid and equipment before the system starts, and only a small amount of steam is required during operation. The steam cost is still relatively high, and it cannot be used in some steam-free enterprises; 4. The system runs with high noise, and the noise pollution is seriously harmful to the health of enterprise employees. Depending on the size and working conditions of the system, the noise is mostly above 95 decibels. Summary of the Invention

[0005] To solve the problems in the prior art that the one-time investment cost of the MVR evaporation concentrator is high, external steam is required, and due to the large volume of the compressor, inconvenient equipment maintenance, and high noise, the present invention provides an electromagnetic induction evaporation concentrator.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows. An electromagnetic induction evaporation concentrator includes an evaporation chamber, a separator, a first heating device, and a second heating device. Both the first heating device and the second heating device include a magnetic conductive circular tube and an induction coil. The induction coil is wound around the magnetic conductive circular tube, and the induction coil is electrically connected to an alternating current induction power supply. The magnetic conductive circular tube of the first heating device is sleeved on the lower part of the evaporation chamber, and the secondary steam outlet of the evaporation chamber is communicated with the steam inlet of the separator. The magnetic conductive circular tube of the second heating device is sleeved on the pipeline of the steam outlet of the separator.

[0007] Preferably, the material of the magnetic conductive circular tube is selected as stainless steel 410. Since most of the materials of the existing evaporation concentrators adopt stainless steel with low carbon content, duplex steel, and titanium materials, the magnetic conductivity is poor, resulting in low heating efficiency, large energy consumption loss, and increased equipment investment cost. The material of the magnetic conductive circular tube in this application is selected as stainless steel 410, which has a high carbon content. The magnetic conductive circular tube is sleeved at the place where the evaporation concentrator needs to be heated to solve this problem.

[0008] Preferably, the magnetic conductive circular tube is wrapped with silica cotton, and the silica cotton is located between the magnetic conductive circular tube and the induction coil. The induction coil is selected as a high-temperature cable, and the induction coil is wound and fixed by a high-temperature tape or an aluminum foil tape. The alternating current flowing through the induction coil generates an alternating magnetic field passing through the magnetic conductive circular tube, and this magnetic field causes the magnetic conductive circular tube to generate eddy currents for heating. The aluminum foil tape also has the function of preventing magnetic leakage and reducing energy loss; the silica cotton plays the role of heat preservation, heat insulation, and sound absorption, improving the safety and stability of the first heating device and the second heating device.

[0009] Preferably, both the first heating device and the second heating device are encapsulated by a stainless steel shell. The stainless steel is selected as 304 stainless steel with a thickness of 1 mm. Encapsulating with stainless steel effectively protects the first heating device and the second heating device, extends the service life of the first heating device and the second heating device, and beautifies the appearance.

[0010] Preferably, the shell is of a split structure, and the shell is fastened and fixed by a first bolt. The split structure of the shell is convenient for disassembly and is convenient for replacement and maintenance.

[0011] Preferably, the outer shell has a structure of two semi - circles. The outer shell of the first heating device is fixedly arranged at the lower part of the evaporation chamber through screws. The outer shell of the second heating device further includes flange plates at both ends. The flange plates are sleeved on the pipeline of the steam outlet of the separator, and the first bolt fixedly connects the outer shell to the flange plate. The structure of the outer shell is simple and reliable, and the manufacturing and assembly costs are relatively low.

[0012] Preferably, the magnetic - conducting circular tube has a split structure and is fastened and fixed by a second bolt. The material of the magnetic - conducting circular tube is made of stainless steel 410 with a thickness of 2 mm to 4 mm (high carbon content, good heating effect, meeting the requirements of the production environment). The split - type magnetic - conducting circular tube is convenient for disassembly, replacement and maintenance.

[0013] Preferably, the magnetic - conducting circular tube has a structure of two semi - circles. There are mating connection parts on the two semi - circular structures of the magnetic - conducting circular tube, and the second bolt locks and fixes the magnetic - conducting circular tube through the connection parts. The structure of the magnetic - conducting circular tube is simple and reliable, and the manufacturing and assembly costs are relatively low.

[0014] Furthermore, the electromagnetic induction evaporation concentrator further includes a heating chamber, a condensate tank, a raw material tank, a circulation pump, a stock solution pump and a vacuum pump. A pre - heating coil is arranged in the condensate tank. The stock solution pump is used to pump the stock solution in the raw material tank to the pre - heating coil. The inlet of the circulation pump is respectively communicated with the liquid outlet of the pre - heating coil and the circulation port of the evaporation chamber, and the outlet of the circulation pump is communicated with the tube side of the heating chamber. The shell side of the heating chamber is communicated with the steam outlet of the separator, and the second heating device is located between the heating chamber and the separator. The liquid outlet, vapor - liquid balance outlet and condensate outlet at the lower head of the heating chamber are located at the lower part of the heating chamber and are arranged in sequence from bottom to top. The liquid outlet and vapor - liquid balance outlet at the lower head of the heating chamber are both communicated with the evaporation chamber, and the condensate outlet of the heating chamber is communicated with the condensate tank. Both the heating chamber and the condensate tank are connected to the vacuum pump.

[0015] Furthermore, the electromagnetic induction evaporation concentrator further includes a concentrated liquid pump and a condensate pump. The concentrated liquid pump is connected to the discharge port of the evaporation chamber and is used to discharge the concentrated liquid in the evaporation chamber. The condensate pump is connected to the condensate outlet of the condensate tank and is used to discharge the condensate in the condensate tank.

[0016] The electromagnetic induction evaporation concentrator of the present invention has the following beneficial effects:

[0017] 1. Low cost: The cost of a single compressor for MVR ranges from hundreds of thousands to millions; the cost of the induction heat source of this electromagnetic induction evaporation concentrator is from one - tenth to one - hundredth of that of the compressor.

[0018] 2. Wider application range: The whole process of this electromagnetic induction evaporation concentrator does not require any steam source.

[0019] 3. Energy saving: The efficiency of the MVR evaporation and concentration compressor (Roots compressor) is generally only about 78%, while the efficiency of this electromagnetic induction evaporation concentrator is generally above 95% (it will infinitely approach 100% with the continuous improvement of the heating body material and the update of the induction power supply).

[0020] 4. Higher efficiency: The temperature rise of the MVR evaporation and concentration compressor (Roots compressor) is between 8 degrees and 18 degrees (the centrifugal compression can reach 25 degrees); while for this electromagnetic induction evaporation concentrator, the temperature rise of the induction evaporation and concentration from normal temperature to over 300 degrees only takes three to five minutes. With such a large temperature rise range, the heating area of the equipment can be relatively reduced, the cost investment of the equipment can be reduced, and the floor area can also be reduced, greatly improving the competitive advantage.

[0021] 5. When evaporating and concentrating organic solvents, it is safe and reliable: The secondary steam is also a flammable and explosive gas. When using MVR for evaporation and concentration, the gas enters the compressor cavity. Most compressors have two - or three - blade impellers. The impellers rotate at high speed, and there is mutual friction between the gas, the impellers, and the cavity, posing a safety hazard; this electromagnetic induction evaporation concentrator has no compressor and thus no safety hazard.

[0022] 6. This electromagnetic induction evaporation concentrator has no compressor and thus no noise pollution problem, and the silica cotton plays a role in sound absorption.

[0023] 7. Easy to replace and maintain, long service life: The existing MVR evaporation and concentration compressor is a core component, with high cost, high failure frequency, long maintenance cycle, large volume, and inconvenient maintenance and replacement; while for this electromagnetic induction evaporation concentrator, the induction heat source takes into account the maintenance and replacement issues during the design and processing. From the mechanical part to the electrical part, it is made in a flexible connection form, which is convenient for replacement. In order to reduce production costs and improve product quality, the heating part adopts a special cable structure, which does not generate heat itself, can withstand temperatures above 500°C, and has a service life of more than 5 years, with basically no maintenance cost in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is the schematic structural principle diagram of the electromagnetic induction evaporation concentrator of the present invention;

[0026] Figure 2 is Figure 1Schematic diagram of partial structural principles therein, where the raw material tank and the stock solution pump are not shown;

[0027] Figure 3 is Figure 1 schematic diagram of the structural principle of the evaporation chamber part therein;

[0028] Figure 4 is the explosion diagram of the first heating device of the electromagnetic induction evaporation concentrator of the present invention;

[0029] Figure 5 is the explosion diagram of the second heating device of the electromagnetic induction evaporation concentrator of the present invention;

[0030] In the figure: 1. Evaporation chamber, 2. Separator, 3. First heating device, 3-1. Magnetically conductive circular tube, 3-1-1. Connection part, 3-2. Induction coil, 3-3. Outer shell, 3-4. Second bolt, 4. Second heating device, 4-1. Flange, 5. Heating chamber, 6. Condensate tank, 6-1. Preheating coil, 7. Raw material tank, 8. Circulation pump, 9. Stock solution pump, 10. Concentrate pump, 11. Condensate pump, 12. Pipeline. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] Embodiment 1

[0033] Such as Figures 1 to 4As shown in the figure, an electromagnetic induction evaporation concentrator includes an evaporation chamber 1, a separator 2, a first heating device 3 and a second heating device 4. The first heating device 3 and the second heating device 4 both include a magnetic conduction circular tube 3-1 and an induction coil 3-2. The induction coil 3-2 is wound around the magnetic conduction circular tube 3-1. The induction coil 3-2 is electrically connected to an alternating current induction power supply, and the alternating current induction power supply provides an alternating current for the induction coil 3-2. The alternating current flowing through the induction coil 3-2 generates an alternating magnetic field passing through the magnetic conduction circular tube 3-1, and this magnetic field causes the magnetic conduction circular tube 3-1 to generate eddy currents for heating. The magnetic conduction circular tube 3-1 of the first heating device 3 is sleeved on the lower part of the evaporation chamber 1. The secondary steam outlet of the evaporation chamber 1 is communicated with the steam inlet of the separator 2. The separator 2 is a steam-liquid separator 2. The magnetic conduction circular tube 3-1 of the second heating device 4 is sleeved on the pipeline 12 at the steam outlet of the separator 2. The material of the magnetic conduction circular tube 3-1 is selected as stainless steel 410. The thickness of the stainless steel 410 in this embodiment is 2 mm to 4 mm. Because most of the materials of the existing evaporation concentrators adopt stainless steel, duplex steel and titanium materials with low carbon content and poor magnetic conductivity, the heating efficiency is low, the energy consumption loss is large, and the equipment investment cost is increased. The material of the magnetic conduction circular tube 3-1 of this application is selected as stainless steel 410, and the carbon content of the stainless steel 410 is high. The magnetic conduction circular tube is sleeved at the place where the evaporation concentrator needs to be heated to solve this problem.

[0034] This electromagnetic induction evaporation concentrator further includes a heating chamber 5, a condensate tank 6, a raw material tank 7, a circulation pump 8, a raw liquid pump 9, a vacuum pump, a concentrated liquid pump 10 and a condensate pump 11. A preheating coil 6-1 is arranged in the condensate tank 6. The raw liquid pump 9 is used to pump the raw liquid in the raw material tank 7 to the preheating coil 6-1. The inlet of the circulation pump 8 is respectively communicated with the outlet of the preheating coil 6-1 and the circulation port of the evaporation chamber 1. The outlet of the circulation pump 8 is communicated with the tube side of the heating chamber 5 through the upper head inlet of the heating chamber 5. The shell side of the heating chamber 5 is communicated with the steam outlet of the separator 2. The second heating device 4 is located between the heating chamber 5 and the separator 2. The outlet of the lower head of the heating chamber 5, the vapor-liquid balance outlet and the condensate outlet are located at the lower part of the heating chamber 5 and are arranged in sequence from bottom to top. The outlet of the lower head of the heating chamber 5 and the vapor-liquid balance outlet are both communicated with the evaporation chamber 1. The condensate outlet of the heating chamber 5 is communicated with the condensate tank 6. Both the heating chamber 5 and the condensate tank 6 are connected to a vacuum pump (not shown in the figure). The concentrated liquid pump 10 is connected to the outlet of the evaporation chamber 1 and is used to discharge the concentrated liquid in the evaporation chamber 1. The condensate pump 11 is connected to the condensate outlet of the condensate tank 6 and is used to discharge the condensate in the condensate tank 6.

[0035] As Figure 4 and Figure 5As shown, the magnetic conduction circular tube 3-1 is wrapped with silica cotton (not shown in the figure). The silica cotton is located between the magnetic conduction circular tube 3-1 and the induction coil 3-2. The induction coil 3-2 is made of high-temperature cable and is fixed by winding with high-temperature tape or aluminum foil tape (not shown in the figure). The aluminum foil tape also has the function of preventing magnetic leakage and reducing energy loss. The silica cotton plays a role in heat preservation, heat insulation and sound absorption, improving the safety and stability of the first heating device and the second heating device. The first heating device 3 and the second heating device 4 are both encapsulated by a stainless steel shell 3-3. The stainless steel selected is 304 stainless steel with a thickness of 1 mm, which effectively protects the first heating device 3 and the second heating device 4, extends the service life of the first heating device and the second heating device and beautifies the appearance.

[0036] For the convenience of disassembly, replacement and maintenance, the shell 3-3 is of a split structure and is fastened and fixed by a first bolt (not shown in the figure). Specifically, the shell 3-3 is in two semi-circular structures. The shell 3-3 of the first heating device 3 is fixedly arranged at the lower part of the evaporation chamber 1 by screws (not shown in the figure). The shell 3-3 of the second heating device 4 further includes flange plates 4-1 at both ends thereof. The flange plates 4-1 are sleeved on the pipeline 12 at the steam outlet of the separator 2. The first bolt fixedly connects the shell 3-3 to the flange plates 4-1. The magnetic conduction circular tube 3-1 is also of a split structure and is fastened and fixed by a second bolt 3-4. Specifically, the magnetic conduction circular tube 3-1 is in two semi-circular structures, and a mating connection part 3-1-1 is arranged on the two semi-circular structures of the magnetic conduction circular tube 3-1. The second bolt 3-4 locks and fixes the magnetic conduction circular tube 3-1 through the connection part 3-1-1.

[0037] The working principle is as follows:

[0038] First, the stock solution pump 9 extracts the stock solution from the raw material tank 7 to the preheating coil 6-1. Then, the circulating pump 8 extracts the preheated stock solution in the condensate tank 6 to the tube side of the heating chamber 5. At the same time, the first heating device 3 preheats the stock solution in the evaporation chamber 1. When it is heated to generate secondary steam (such as water at 90°C to 98°C), the vacuum pump evacuates the heating chamber 5, enabling the secondary steam to flow from the evaporation chamber 1, the separator 2 to the second heating device 4 in sequence. After the second heating device 4 reheats and boosts the pressure of the secondary steam, the secondary steam enters the shell side of the heating chamber 5. At this time, the secondary steam in the shell side of the heating chamber 5 exchanges heat with the stock solution in the tube side of the heating chamber 5, and the secondary steam in the shell side of the heating chamber 5 forms condensate. Meanwhile, the vacuum pump evacuates the condensate tank 6, and the condensate in the shell side of the heating chamber 5 flows from the condensate outlet of the heating chamber 5 into the condensate tank 6. The condensate with residual heat preheats the stock solution in the preheating coil 6-1. After the condensate preheats the stock solution in the preheating coil 6-1, the condensate pump 11 discharges the condensate in the condensate tank 6, achieving zero sewage discharge. Moreover, the temperature of the condensate that was originally to be discarded is fully utilized, recovering the latent heat and improving the thermal efficiency. The stock solution heated by the secondary steam in the tube side of the heating chamber 5 flows out from the liquid outlet of the lower head of the heating chamber 5 to the evaporation chamber 1. At the same time, the mixed vapor-liquid stock solution flows from the vapor-liquid equilibrium outlet of the heating chamber 5 to the evaporation chamber 1. At this time, the circulating pump 8 extracts the stock solution with a low concentration in the upper part of the evaporation chamber 1 to the tube side of the heating chamber 5 for circulation, maintaining the evaporation state of the stock solution, improving the evaporation efficiency, reducing energy consumption. The stock solution in the evaporation chamber 1 that reaches the set concentration value is discharged from the evaporation concentrator by the concentrated solution pump 10.

[0039] The working principles of the above-mentioned first heating device 3 and second heating device 4 are as follows: The high-frequency alternating current generated by the AC induction power supply passes through the induction coil 3-2 to generate an alternating magnetic field. The magnetic conduction circular tube 3-1 is placed therein to cut the alternating magnetic force lines, thereby generating an alternating current (i.e., eddy current) inside the magnetic conduction circular tube 3-1. The eddy current causes the atoms inside the object to move at high speed and randomly. The atoms collide and rub against each other to generate heat energy, thus achieving the effect of heating the magnetic conduction circular tube 3-1. That is, it is a heating method that converts electrical energy into magnetic energy, enabling the heated magnetic conduction circular tube 3-1 to sense the magnetic energy and generate heat. Since the induction coil 3-2 and the magnetic conduction circular tube 3-1 are completely closed at 360 degrees in physical space, the heating efficiency is particularly high, generally above 95%. In the traditional heating industry, the commonly used methods are resistance wire and quartz heating. For this traditional heating method, the thermal efficiency is relatively low. The resistance wire and quartz mainly generate heat by themselves after being energized and then transfer the heat to the barrel, thereby achieving the effect of heating the object. The heat utilization rate of this heating effect is at most about 50%. The other about 50% of the heat is dissipated into the air, and the power loss of the traditional resistance wire heating method is as high as more than 50%. Through electromagnetic induction heating, a magnetic field is generated by the current, causing the iron metal pipeline to generate heat by itself. Coupled with heat insulation materials, the heat dissipation of the pipeline is prevented, and the heat utilization rate is as high as more than 95%. The induction heat source of this electromagnetic induction evaporation concentrator replaces the compressor of the traditional evaporation concentrator to reheat and boost the pressure of the secondary steam from the evaporation chamber 1 to the heating chamber 5.

[0040] Since the temperature of the secondary steam is increased by at least 15 degrees or more by the second heating device 4 on the original basis, the secondary steam in the shell side of the heating chamber 5 exchanges heat with the original liquid in the tube side of the heating chamber 5. Due to the heat exchange with a temperature difference of more than 15 degrees between the vapor phase and the liquid phase, the secondary steam becomes condensate water in the shell side of the heating chamber 5 and flows into the condensate tank 6. The preheating coil 6-1 preheats the feed liquid, so that the heat loss of the entire system is small and more energy-efficient;

[0041] The first heating device 3 and the second heating device 4 of the present invention can also be used as the heat source of an extraction tank (static extraction, dynamic extraction, multi-functional extraction), a rising film evaporation concentrator (the material in the heater tube side enters from the bottom and exits from the top or enters and exits from the bottom), and a rectification device.

[0042] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An electromagnetic induction evaporation concentrator, characterized in that: It includes an evaporation chamber (1), a separator (2), a first heating device (3) and a second heating device (4). The first heating device (3) and the second heating device (4) both include a magnetic conductive circular tube (3-1) and an induction coil (3-2). The induction coil (3-2) is wound around the magnetic conductive circular tube (3-1), and the induction coil (3-2) is electrically connected to an alternating current induction power supply. The magnetic conductive circular tube (3-1) of the first heating device (3) is sleeved on the lower part of the evaporation chamber (1). The secondary steam outlet of the evaporation chamber (1) is communicated with the steam inlet of the separator (2). The magnetic conductive circular tube (3-1) of the second heating device (4) is sleeved on the pipeline (12) of the steam outlet of the separator (2). The first heating device (3) and the second heating device (4) are both encapsulated by a stainless steel outer shell (3-3). The outer shell (3-3) is of a split structure and is fastened and fixed by a first bolt. The outer shell (3-3) is in two semi-circular structures. The outer shell (3-3) of the first heating device (3) is fixedly arranged at the lower part of the evaporation chamber (1) by screws. The outer shell (3-3) of the second heating device (4) further includes flange plates (4-1) at both ends thereof. The flange plates (4-1) are sleeved on the pipeline (12) of the steam outlet of the separator (2), and the first bolt fixes and connects the outer shell (3-3) to the flange plates (4-1). The magnetic conductive circular tube (3-1) is of a split structure and is fastened and fixed by a second bolt (3-4). The magnetic conductive circular tube (3-1) is in two semi-circular structures. Matching connecting parts (3-1-1) are arranged on the two semi-circular structures of the magnetic conductive circular tube (3-1), and the second bolt (3-4) locks and fixes the magnetic conductive circular tube (3-1) through the connecting parts (3-1-1).

2. The electromagnetic induction evaporation concentrator according to claim 1, wherein: The material of the magnetic conductive circular tube (3-1) is selected as stainless steel 410.

3. The electromagnetic induction evaporation concentrator according to claim 2, characterized in that: The magnetic conductive circular tube (3-1) is wrapped with silica cotton. The silica cotton is located between the magnetic conductive circular tube (3-1) and the induction coil (3-2). The induction coil (3-2) is selected as a high-temperature cable, and the induction coil (3-2) is wound and fixed by a high-temperature tape or an aluminum foil tape.

4. The electromagnetic induction evaporation concentrator according to any one of claims 1 to 3, characterized in that: The electromagnetic induction evaporation concentrator further includes a heating chamber (5), a condensate tank (6), a raw material tank (7), a circulation pump (8), a stock solution pump (9) and a vacuum pump. A preheating coil (6-1) is arranged in the condensate tank (6). The stock solution pump (9) is used to pump the stock solution in the raw material tank (7) to the preheating coil (6-1). The inlet of the circulation pump (8) is respectively communicated with the liquid outlet of the preheating coil (6-1) and the circulation port of the evaporation chamber (1). The outlet of the circulation pump (8) is communicated with the tube side of the heating chamber (5). The shell side of the heating chamber (5) is communicated with the steam outlet of the separator (2). The second heating device (4) is located between the heating chamber (5) and the separator (2). The liquid outlet, the vapor-liquid balance outlet and the condensate outlet of the lower head of the heating chamber (5) are located at the lower part of the heating chamber (5) and are arranged in sequence from bottom to top. The liquid outlet and the vapor-liquid balance outlet of the lower head of the heating chamber (5) are both communicated with the evaporation chamber (1). The condensate outlet of the heating chamber (5) is communicated with the condensate tank (6). The heating chamber (5) and the condensate tank (6) are both connected to the vacuum pump.

5. The electromagnetic induction evaporation concentrator according to claim 4, characterized in that: The electromagnetic induction evaporation concentrator further includes a concentrated liquid pump (10) and a condensate pump (11). The concentrated liquid pump (10) is connected to the discharge port of the evaporation chamber (1) and is used to discharge the concentrated feed liquid in the evaporation chamber (1). The condensate pump (11) is connected to the condensate outlet of the condensate tank (6) and is used to discharge the condensate in the condensate tank (6).

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