Copper acid waste liquid circulating concentration and recovery equipment and use method thereof

Abstract

The invention relates to the technical field of concentration and recovery equipment, and particularly discloses copper acid waste liquid circulating concentration and recovery equipment and a use method thereof.The copper acid waste liquid circulating concentration and recovery equipment comprises an evaporator body, a liquid outlet pipe, a liquid inlet pipe, a motor, a gearbox, a circulating assembly and a stirring assembly; the liquid inlet pipe is arranged on the upper portion of the other side of the evaporator body. The gearbox is arranged on the top of the evaporator body. The motor is arranged at the top of the gearbox, the gearbox is provided with a first output shaft and a second output shaft, the first output shaft is connected with an output shaft of the motor, the first output shaft is provided with a first gear, and the second output shaft is provided with a second gear. According to the invention, the evaporation and concentration efficiency of high-concentration materials or materials concentrated to high concentration can be improved, the energy consumption of the equipment is reduced, and the interior of the equipment is convenient to clean.

Description

Technical Field

[0001] The invention relates to the technical field of concentration and recovery equipment, and in particular to a copper acid waste liquid circulation concentration and recovery equipment and a use method thereof. Background Art

[0002] Low-temperature vacuum evaporation equipment is a high-efficiency and energy-saving equipment that performs evaporation operations under low-temperature vacuum conditions. It is widely used in industrial wastewater treatment, pharmaceuticals, food processing, chemical manufacturing and other fields.

[0003] The existing technology still has the following areas for improvement: low-temperature vacuum evaporation equipment on the market has low heating efficiency and low evaporation and concentration efficiency when processing high-concentration materials or after the materials are concentrated to high concentrations. The equipment has a complex structure, is not easy to clean after use, and generally has high energy consumption. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a copper acid waste liquid circulation concentration recovery equipment and a use method thereof, which can improve the evaporation concentration efficiency of high-concentration materials or materials after being concentrated to high concentrations, reduce equipment energy consumption, and facilitate cleaning of the inside of the equipment.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A copper acid waste liquid circulation concentration recovery device, comprising an evaporator body, a liquid outlet pipe, a liquid inlet pipe, a motor, a gearbox, a circulation component and a stirring component, wherein the liquid outlet pipe is arranged at the lower part of one side of the evaporator body, the liquid inlet pipe is arranged at the upper part of the other side of the evaporator body, and the gearbox is arranged at the top of the evaporator body;

[0007] The motor is arranged on the top of the gearbox, and the gearbox is provided with a first output shaft and a second output shaft, the first output shaft is connected to the output shaft of the motor, a first gear is arranged on the first output shaft, and a second gear is arranged on the second output shaft, the first gear meshes with the second gear, and the number of teeth of the first gear is greater than that of the second gear;

[0008] The stirring assembly includes a stirring rod, a heating wire, a connecting plate and a cleaning scraper, wherein the stirring rod is provided in multiple groups, and the multiple groups of stirring rods are arranged on the first output shaft, the heating wire is wound around the stirring rod, the cleaning scraper is fixedly connected to the connecting plate, and the stirring rod is connected to the connecting plate through a telescopic assembly;

[0009] The circulation component includes a heat exchange tube, an air outlet pipe, a return pipe, a vacuum tube, and a one-way valve. The heat exchange tube is arranged inside the liquid inlet pipe, the heat exchange tube connects the air outlet pipe and the return pipe, the vacuum tube connects the return pipe and the evaporator body, and the one-way valve is arranged on the vacuum tube.

[0010] Preferably, the telescopic assembly includes a storage cavity and a limiting groove, the storage cavity and the limiting groove are provided on the stirring rod, the limiting groove is opened on the side of the stirring rod close to the connecting plate, and the storage cavity is opened on the side of the limiting groove away from the connecting plate.

[0011] Preferably, the telescopic assembly also includes a support rod and a spring, the support rod is arranged inside the storage cavity, one side of the support rod is fixedly connected to the connecting plate, the spring is arranged inside the limiting groove, and the spring is sleeved on the support rod.

[0012] Preferably, the support rod is slidably connected to the storage cavity and the limiting groove.

[0013] Preferably, one side of the spring is fixedly connected to the limiting groove, and the other side of the spring is fixedly connected to the connecting plate.

[0014] Preferably, a vacuum fan is provided in the vacuum tube, and the vacuum fan is located above the one-way valve.

[0015] Preferably, the second output shaft is connected to the vacuum fan.

[0016] Preferably, each group of stirring rods is distributed in a circular array, and multiple groups of stirring rods are evenly distributed.

[0017] Preferably, the heat exchange tube is arranged in a spiral shape.

[0018] A method for using a copper acid waste liquid circulation concentration recovery device, including the following method of use:

[0019] S1: The keto acid waste liquid is introduced into the evaporator body from the liquid inlet pipe, and the keto acid waste liquid is preheated in the liquid inlet pipe by the hot gas in the heat exchange pipe;

[0020] S2: Start the motor, open the one-way valve, rotate the first output shaft, and quickly rotate the second output shaft through the gearbox. The rotation of the first output shaft drives the stirring rod, the heating wire, the connecting plate and the cleaning scraper to stir and mix the ketoacid waste liquid. The heating wire on the stirring rod heats the ketoacid waste liquid. At the same time, the rotation of the second output shaft drives the vacuum fan to rotate to evacuate the inside of the evaporator body, so that the ketoacid waste liquid is vacuum evaporated and concentrated to obtain copper concentrate;

[0021] S3: The copper concentrate is discharged through the liquid outlet pipe and then recovered. The hot gas generated by the evaporation of the ketoacid waste liquid is passed into the reflux pipe through the vacuum pipe, and then into the heat exchange pipe through the reflux pipe. The hot gas exchanges heat with the ketoacid waste liquid in the liquid inlet pipe, and the ketoacid waste liquid is preheated and then discharged through the gas outlet pipe.

[0022] When it is necessary to clean the inside of the evaporator body:

[0023] S4: Pass water into the interior of the evaporator body from the liquid inlet pipe, start the motor and increase the speed of the motor so that the speed of the first output shaft is greater than the speed during stirring and mixing. The rotation of the first output shaft drives the stirring rod, the heating wire connecting plate and the cleaning scraper to rotate. The increase in the speed of the first output shaft increases the centrifugal force generated when the first output shaft rotates. The centrifugal force drives the spring in the limit groove to extend. The spring drives the connecting plate, the cleaning scraper and the support rod to extend along the limit groove, so that the cleaning scraper contacts the inner wall of the evaporator body to clean the inner wall of the evaporator body.

[0024] The beneficial effects of the present invention are:

[0025] (1) By setting a motor, a gearbox, a first output shaft and a second output shaft, the technical effect that can be achieved is that the gearbox is provided with a first output shaft and a second output shaft, the first output shaft is connected to the output shaft of the motor, the first output shaft is provided with a first gear, the second output shaft is provided with a second gear, the first gear meshes with the second gear, the number of teeth of the first gear is greater than that of the second gear, when the motor is started, the rotation speed of the first output shaft is the same as the rotation speed set by the motor, and the rotation speed of the second output shaft is greater than the rotation speed set by the motor, thereby ensuring that the stirring function and the vacuum pumping function of the equipment can operate normally at the same time, using one motor can provide kinetic energy for the stirring function and the vacuum pumping function of the equipment at the same time, reducing the energy consumption of the overall use of the equipment, and being more energy-saving.

[0026] (2) By arranging the motor, the first output shaft, the stirring assembly and the telescopic assembly, the technical effect that can be achieved is that the heating wire is wound around the stirring rod, so that the waste liquid can be stirred and heated at the same time, the fluidity of the waste liquid can be improved, the waste liquid can be prevented from being deposited and scaled, and the heating efficiency of high-concentration waste liquid or waste liquid concentrated to a high concentration can be ensured, and the evaporation concentration efficiency can be improved. The motor, the first output shaft, the stirring rod, the telescopic assembly, the connecting plate and the cleaning scraper cooperate with each other, and the stirring function and the cleaning function can be achieved by adjusting the speed of the motor. There is no need to set up an additional power device of the cleaning structure, which saves energy and facilitates cleaning of the equipment. When the motor sets the stirring speed, the first output shaft rotates to drive the connecting plate and the cleaning scraper to rotate, which can play the function of auxiliary stirring. When the equipment needs to be cleaned, the speed of the motor is increased, and the centrifugal force increases when the first output shaft rotates. The centrifugal force drives the spring in the limit groove to extend, and the spring drives the connecting plate, the cleaning scraper and the support rod to extend along the limit groove, so that the cleaning scraper contacts the inner wall of the evaporator body to clean the inner wall of the evaporator body.

[0027] (3) By setting up a circulation component, the technical effect that can be achieved is that the hot gas generated by the evaporation of the waste liquid passes through the vacuum tube and the reflux tube into the heat exchange tube, which is convenient for the hot gas to exchange heat with the waste liquid in the liquid inlet tube, preheat the waste liquid, reduce the time required for subsequent heating inside the evaporator body, and improve the evaporation concentration efficiency. The heat exchange tube is arranged in a spiral shape to increase the gas-liquid heat exchange area, improve the heat exchange efficiency, and improve the preheating effect of the waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0029] Figure 1 A perspective view of the present invention;

[0030] Figure 2 is an internal structure diagram of the evaporator body of the present invention;

[0031] Figure 3 is a structural diagram of the stirring assembly in the present invention;

[0032] Figure 4 A top view of the stirring assembly of the present invention;

[0033] Figure 5 It is a structural diagram of the telescopic component and part of the stirring component in the present invention;

[0034] Figure 6 It is a cross-sectional view of the telescopic assembly and part of the stirring assembly in the present invention;

[0035] Figure 7 is a schematic diagram of the telescopic assembly of the present invention after being extended;

[0036] Figure 8 It is a structural diagram of some circulation components in the present invention;

[0037] Fig. 9 It is a structural diagram of the vacuum tube and the one-way valve in the present invention;

[0038] Fig.10 It is a structural diagram of the vacuum tube and the vacuum fan in the present invention;

[0039] Fig.11 It is a structural diagram of the vacuum tube, the vacuum fan and the second output shaft in the present invention;

[0040] Description of main component symbols:

[0041] In the figure: 1. Evaporator body; 2. Liquid outlet pipe; 3. Liquid inlet pipe; 301. Heat exchange pipe; 4. Air outlet pipe; 5. Reflux pipe; 6. Motor; 7. Gearbox; 8. First output shaft; 9. Stirring rod; 901. Storage chamber; 902. Support rod; 903. Limiting groove; 904. Spring; 10. Heating wire; 11. Connecting plate; 1101. Cleaning scraper; 12. Vacuum tube; 1201. Vacuum fan; 1202. Second output shaft; 13. One-way valve. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are clearly and completely described below in combination with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present application, it should be understood that the orientation or position relationship indicated by "inside" or "outside" is based on the orientation or position described in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, specific orientation structure and operation, and therefore cannot be understood as a limitation on the present application.

[0044] Reference Figures 1 to 11 The present invention discloses a copper acid waste liquid circulation concentration recovery device, comprising an evaporator body 1, a liquid outlet pipe 2, a liquid inlet pipe 3, a motor 6, a gearbox 7, a circulation component and a stirring component, wherein the liquid outlet pipe 2 is arranged at the lower part of one side of the evaporator body 1, the liquid inlet pipe 3 is arranged at the upper part of the other side of the evaporator body 1, and the gearbox 7 is arranged at the top of the evaporator body 1;

[0045] The motor 6 is arranged on the top of the gearbox 7, and the gearbox 7 is provided with a first output shaft 8 and a second output shaft 1202. The first output shaft 8 is connected with the output shaft of the motor 6, and a first gear is arranged on the first output shaft 8, and a second gear is arranged on the second output shaft 1202. The first gear meshes with the second gear, and the number of teeth of the first gear is greater than that of the second gear. When the motor 6 is started, the rotation speed of the first output shaft 8 is the same as the rotation speed set for the motor 6, and the rotation speed of the second output shaft 1202 is greater than the rotation speed set for the motor 6, so as to ensure that the stirring function and the vacuuming function of the equipment can operate normally at the same time. Using one motor 6 can provide kinetic energy for the stirring function and the vacuuming function of the equipment at the same time, thereby reducing the energy consumption of the overall use of the equipment and being more energy-saving.

[0046] The stirring assembly includes a stirring rod 9, a heating wire 10, a connecting plate 11 and a cleaning scraper 1101. The stirring rod 9 is provided with multiple groups, and the multiple groups of stirring rods 9 are arranged on the first output shaft 8. The heating wire 10 is wound around the stirring rod 9, so as to facilitate stirring the material while heating the waste liquid, which is ketoacid waste liquid in this example, to improve the fluidity of the waste liquid, prevent the waste liquid from sedimentation and scaling, and ensure the heating efficiency of high-concentration waste liquid or waste liquid concentrated to high concentration, and improve the evaporation concentration efficiency. The cleaning scraper 1101 is fixedly connected to the connecting plate 11, and the stirring rod 9 is connected to the connecting plate 11 through a telescopic assembly;

[0047] The circulation component includes a heat exchange tube 301, an air outlet pipe 4, a return pipe 5, a vacuum tube 12, and a one-way valve 13. The heat exchange tube 301 is arranged inside the liquid inlet pipe 3. The heat exchange tube 301 connects the air outlet pipe 4 and the return pipe 5. The vacuum tube 12 connects the return pipe 5 and the evaporator body 1. The one-way valve 13 is arranged on the vacuum tube 12. The hot gas generated by the evaporation of the waste liquid passes through the vacuum tube 12 and the return pipe 5 into the heat exchange tube 301, which is convenient for the hot gas to exchange heat with the waste liquid in the liquid inlet pipe 3, preheat the waste liquid, reduce the time required for subsequent heating inside the evaporator body 1, and improve the evaporation concentration efficiency.

[0048] Reference Figures 5 to 7 The telescopic assembly includes a storage cavity 901 and a limiting groove 903. The storage cavity 901 and the limiting groove 903 are opened on the stirring rod 9. The limiting groove 903 is opened on the side of the stirring rod 9 close to the connecting plate 11, and the storage cavity 901 is opened on the side of the limiting groove 903 away from the connecting plate 11.

[0049] Reference Figures 5 to 7The telescopic assembly also includes a support rod 902 and a spring 904. The support rod 902 is arranged inside the storage cavity 901, one side of the support rod 902 is fixedly connected to the connecting plate 11, and the spring 904 is arranged inside the limiting groove 903, and the spring 904 is sleeved on the support rod 902; the support rod 902 is slidably connected to the storage cavity 901 and the limiting groove 903; one side of the spring 904 is fixedly connected to the limiting groove 903, and the other side of the spring 904 is fixedly connected to the connecting plate 11.

[0050] By matching the motor 6, the first output shaft 8, the stirring rod 9, the telescopic component, the connecting plate 11 and the cleaning scraper 1101, the stirring function and the cleaning function can be achieved by adjusting the rotation speed of the motor 6. There is no need to additionally set up a power device for the cleaning structure, which saves energy and facilitates cleaning of the equipment. When the motor 6 sets the stirring speed, the first output shaft 8 rotates to drive the connecting plate 11 and the cleaning scraper 1101 to rotate, which can play an auxiliary stirring function. When the equipment needs to be cleaned, the rotation speed of the motor 6 is increased, and the centrifugal force is increased when the first output shaft 8 rotates. The centrifugal force drives the spring 904 in the limit groove 903 to extend, and the spring 904 drives the connecting plate 11, the cleaning scraper 1101 and the support rod 902 to extend along the limit groove 903, so that the cleaning scraper 1101 contacts the inner wall of the evaporator body 1 to clean the inner wall of the evaporator body 1.

[0051] Reference Figures 2 to 4 as well as Figures 8 to 11 A vacuum fan 1201 is provided in the vacuum tube 12, and the vacuum fan 1201 is located above the one-way valve 13; the second output shaft 1202 is connected to the vacuum fan 1201; each group of stirring rods 9 is distributed in a circular array, and multiple groups of stirring rods 9 are evenly arranged; the heat exchange tube 301 is arranged in a spiral shape, which increases the gas-liquid heat exchange area, improves the heat exchange efficiency, and enhances the preheating effect of the waste liquid.

[0052] A method for using a copper acid waste liquid circulation concentration recovery device, including the following method of use:

[0053] S1: The keto acid waste liquid is introduced into the evaporator body 1 from the liquid inlet pipe 3, and the keto acid waste liquid is preheated in the liquid inlet pipe 3 by the hot gas in the heat exchange pipe 301;

[0054] S2: Start the motor 6, open the one-way valve 13, rotate the first output shaft 8, and quickly rotate the second output shaft 1202 via the gearbox 7. The first output shaft 8 rotates to drive the stirring rod 9, the heating wire 10, the connecting plate 11 and the cleaning scraper 1101 to rotate to stir and mix the keto-acid waste liquid. The heating wire 10 on the stirring rod 9 heats the keto-acid waste liquid. At the same time, the second output shaft 1202 rotates to drive the vacuum fan 1201 to rotate to evacuate the inside of the evaporator body 1, so that the keto-acid waste liquid is vacuum evaporated and concentrated to obtain a copper concentrate.

[0055] S3: The copper concentrate is discharged through the liquid outlet pipe 2 and then recovered. The hot gas generated by the evaporation of the ketoacid waste liquid is passed into the reflux pipe 5 through the vacuum pipe 12, and then into the heat exchange pipe 301 through the reflux pipe 5. The hot gas exchanges heat with the ketoacid waste liquid in the liquid inlet pipe 3, and the ketoacid waste liquid is preheated and then discharged through the gas outlet pipe 4.

[0056] When it is necessary to clean the inside of the evaporator body 1:

[0057] S4: water is introduced into the evaporator body 1 from the liquid inlet pipe 3, the motor 6 is started and the speed of the motor 6 is increased, so that the speed of the first output shaft 8 is greater than the speed during stirring and mixing, and the first output shaft 8 rotates to drive the stirring rod 9, the heating wire 10, the connecting plate 11 and the cleaning scraper 1101 to rotate. The increase in the speed of the first output shaft 8 increases the centrifugal force generated when the first output shaft 8 rotates, and the centrifugal force drives the spring 904 in the limiting groove 903 to extend, and the spring 904 drives the connecting plate 11, the cleaning scraper 1101 and the support rod 902 to extend along the limiting groove 903, so that the cleaning scraper 1101 contacts the inner wall of the evaporator body 1, and cleans the inner wall of the evaporator body 1.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A copper acid waste liquid circulation concentration recovery device, characterized in that: The evaporator comprises an evaporator body (1), a liquid outlet pipe (2), a liquid inlet pipe (3), a motor (6), a gearbox (7), a circulation component and a stirring component, wherein the liquid outlet pipe (2) is arranged at the lower part of one side of the evaporator body (1), the liquid inlet pipe (3) is arranged at the upper part of the other side of the evaporator body (1), and the gearbox (7) is arranged at the top of the evaporator body (1); The motor (6) is arranged on the top of the gearbox (7), and the gearbox (7) is provided with a first output shaft (8) and a second output shaft (1202), the first output shaft (8) is connected to the output shaft of the motor (6), a first gear is arranged on the first output shaft (8), and a second gear is arranged on the second output shaft (1202), the first gear meshes with the second gear, and the number of teeth of the first gear is greater than that of the second gear; The stirring assembly comprises a stirring rod (9), a heating wire (10), a connecting plate (11) and a cleaning scraper (1101); the stirring rod (9) is provided in multiple groups, the multiple groups of stirring rods (9) are arranged on the first output shaft (8), the heating wire (10) is wound around the stirring rod (9), the cleaning scraper (1101) is fixedly connected to the connecting plate (11), and the stirring rod (9) is connected to the connecting plate (11) via a telescopic assembly; The circulation component comprises a heat exchange tube (301), an air outlet pipe (4), a return pipe (5), a vacuum tube (12), and a one-way valve (13); the heat exchange tube (301) is arranged inside the liquid inlet pipe (3); the heat exchange tube (301) is connected to the air outlet pipe (4) and the return pipe (5); the vacuum tube (12) is connected to the return pipe (5) and the evaporator body (1); and the one-way valve (13) is arranged on the vacuum tube (12).

2. The copper acid waste liquid circulation concentration and recovery equipment according to claim 1 is characterized in that: The telescopic assembly comprises a storage cavity (901) and a limiting groove (903); the storage cavity (901) and the limiting groove (903) are provided on the stirring rod (9); the limiting groove (903) is provided on a side of the stirring rod (9) close to the connecting plate (11); and the storage cavity (901) is provided on a side of the limiting groove (903) away from the connecting plate (11).

3. The copper acid waste liquid circulation concentration and recovery equipment according to claim 2 is characterized in that: The telescopic assembly also includes a support rod (902) and a spring (904); the support rod (902) is arranged inside the storage cavity (901); one side of the support rod (902) is fixedly connected to the connecting plate (11); the spring (904) is arranged inside the limiting groove (903); and the spring (904) is sleeved on the support rod (902).

4. The copper acid waste liquid circulation concentration and recovery equipment according to claim 3 is characterized in that: The support rod (902) is slidably connected to the storage cavity (901) and the limiting groove (903).

5. The copper acid waste liquid circulation concentration and recovery equipment according to claim 3 is characterized in that: One side of the spring (904) is fixedly connected to the limiting groove (903), and the other side of the spring (904) is fixedly connected to the connecting plate (11).

6. The copper acid waste liquid circulation concentration and recovery equipment according to claim 1 is characterized in that: A vacuum fan (1201) is arranged in the vacuum tube (12), and the vacuum fan (1201) is located above the one-way valve (13).

7. The copper acid waste liquid circulation concentration and recovery equipment according to claim 6 is characterized in that: The second output shaft (1202) is connected to the vacuum fan (1201).

8. The copper acid waste liquid circulation concentration and recovery equipment according to claim 1 is characterized in that: Each group of stirring rods (9) is distributed in a circular array, and multiple groups of stirring rods (9) are evenly distributed.

9. The copper acid waste liquid circulation concentration and recovery equipment according to claim 1 is characterized in that: The heat exchange tube (301) is arranged in a spiral shape.

10. A method for using a copper acid waste liquid circulation concentration recovery device, applied to a copper acid waste liquid circulation concentration recovery device according to any one of claims 1 to 9, characterized in that: Including usage as follows: S1: introducing keto acid waste liquid into the evaporator body (1) from the liquid inlet pipe (3), and the keto acid waste liquid is preheated in the liquid inlet pipe (3) by the hot air in the heat exchange pipe (301); S2: starting the motor (6), opening the one-way valve (13), rotating the first output shaft (8), and rapidly rotating the second output shaft (1202) via the gearbox (7). The first output shaft (8) rotates to drive the stirring rod (9), the heating wire (10), the connecting plate (11) and the cleaning scraper (1101) to rotate to stir and mix the ketoacid waste liquid. The heating wire (10) on the stirring rod (9) heats the ketoacid waste liquid. At the same time, the second output shaft (1202) rotates to drive the vacuum fan (1201) to rotate to evacuate the interior of the evaporator body (1), so that the ketoacid waste liquid is vacuum evaporated and concentrated to obtain a copper concentrate. S3: The copper concentrate is discharged through the liquid outlet pipe (2) and then recovered. The hot gas generated by the evaporation of the ketoacid waste liquid is passed into the reflux pipe (5) through the vacuum pipe (12), and then passed into the heat exchange pipe (301) through the reflux pipe (5). The hot gas exchanges heat with the ketoacid waste liquid in the liquid inlet pipe (3), and the ketoacid waste liquid is preheated and then discharged through the gas outlet pipe (4); When it is necessary to clean the inside of the evaporator body (1): S4: water is introduced into the interior of the evaporator body (1) from the liquid inlet pipe (3), the motor (6) is started and the rotation speed of the motor (6) is increased so that the rotation speed of the first output shaft (8) is greater than the rotation speed during stirring and mixing. The first output shaft (8) rotates to drive the stirring rod (9), the heating wire (10), the connecting plate (11) and the cleaning scraper (1101) to rotate. The increase in the rotation speed of the first output shaft (8) increases the centrifugal force generated when the first output shaft (8) rotates. The centrifugal force drives the spring (904) in the limiting groove (903) to extend. The spring (904) drives the connecting plate (11), the cleaning scraper (1101) and the support rod (902) to extend along the limiting groove (903), so that the cleaning scraper (1101) contacts the inner wall of the evaporator body (1) to clean the inner wall of the evaporator body (1).

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