High viscosity material rotary film distribution evaporation device based on porous interception plate and evaporation method

Abstract

The application discloses a kind of high viscosity material rotary film distribution evaporation device and evaporation method based on porous interception plate, it is related to evaporation equipment technical field, wherein high viscosity material rotary film distribution evaporation device based on porous interception plate includes evaporation cylinder body, and rotating film distribution assembly and heating assembly are equipped in evaporation cylinder body, heating assembly is used to heat inside evaporation cylinder body, and material inlet is equipped on evaporation cylinder body;Rotating film distribution assembly includes rotary drive device, and the output shaft of rotary drive device is connected with rotating transmission shaft, and rotating transmission shaft is fixed on a plurality of porous interception plates, and a plurality of interception holes are equipped on each porous interception plate, material from material inlet can be transported to porous interception plate, and rotary drive device is electrically connected with control device.The application utilizes rotary drive device to drive porous interception plate to rotate, and the thickness of material on porous interception plate can be controlled by controlling the rotation speed of porous interception plate, to realize the uniform distribution of material, prevent local accumulation.

Description

Technical Field

[0001] This invention relates to the field of evaporation equipment technology, and in particular to a rotary film evaporation device and evaporation method for high-viscosity materials based on a porous retaining plate. Background Technology

[0002] High-viscosity materials are widely used in petrochemical, biopharmaceutical, and new materials industries, and their evaporation and concentration processes are key steps in industrial production. Compared to low-viscosity materials, high-viscosity materials, due to their poor flowability, high heat transfer resistance, and high surface tension, are prone to problems such as uneven film distribution, localized liquid accumulation, and low heat transfer efficiency during evaporation. The materials also tend to adhere to and coke on the surfaces of equipment internals, leading to short equipment operating cycles and high maintenance costs. This has become a core technological bottleneck restricting the efficient processing of high-viscosity materials.

[0003] Currently, industrial evaporation devices for high-viscosity materials mainly consist of thin-film evaporators and falling-film evaporators. However, existing equipment still has many insurmountable shortcomings. In the film distribution stage, traditional devices mostly use fixed dispersion discs or a single rotating scraper structure. Fixed dispersion discs rely solely on the gravity of the material for film distribution, which cannot adapt to the rheological characteristics of high-viscosity materials, easily resulting in excessively thick film and localized accumulation. Although rotating scrapers can force film distribution, the friction between the scraper and the inner wall of the equipment can easily cause component wear, and it is difficult to achieve uniform material distribution, thus failing to fully expand the evaporation contact area.

[0004] Therefore, there is an urgent need in the field for a rotary film evaporation device and evaporation method for high-viscosity materials based on a porous retaining plate to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a rotary film evaporation device and evaporation method for high-viscosity materials based on a porous retaining plate, so as to solve the problems existing in the prior art and enable the material to be evenly distributed on the porous retaining plate.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention discloses a rotary film evaporation device for high-viscosity materials based on a porous retaining plate, comprising an evaporation cylinder, wherein a rotary film-laying assembly and a heating assembly are provided inside the evaporation cylinder, the heating assembly is used to heat the interior of the evaporation cylinder, and a material inlet is provided on the evaporation cylinder; The rotating film assembly includes a rotating drive device, the output shaft of which is connected to a rotating transmission shaft. Several porous retaining plates are fixed on the rotating transmission shaft. Each porous retaining plate is provided with multiple retaining holes. Material entering from the material inlet can be conveyed to the porous retaining plate. The rotating drive device is electrically connected to a control device.

[0007] Preferably, the porous retaining plate has a conical structure, and the diameter of the porous retaining plate gradually increases from top to bottom.

[0008] Preferably, the evaporation cylinder is provided with an annular distributor, the upper end of the annular distributor is connected to the material inlet, the lower end of the annular distributor has a plurality of first distribution ports evenly distributed around its circumference, and the inner wall of the annular distributor has a plurality of second distribution ports evenly distributed around its circumference.

[0009] Preferably, the first uniformly distributed opening is a straight tube structure or a tapered tube structure.

[0010] Preferably, the heating assembly includes a heat exchange tube filled with a heat exchange medium, and both ends of the heat exchange tube are connected to a circulation pipeline, on which a circulation heating device is provided.

[0011] Preferably, the heat exchange tubes are arranged in a spiral pattern.

[0012] Preferably, the side wall of the rotary drive shaft is provided with a plurality of stirring blades.

[0013] Preferably, the outer wall of the evaporator cylinder is provided with a heat insulation layer.

[0014] Preferably, the inner wall of the evaporation cylinder is provided with a laser sensor, a temperature sensor and a liquid level sensor, and the laser sensor, the temperature sensor and the liquid level sensor are all electrically connected to the control device.

[0015] This invention discloses an evaporation method for a rotary film evaporator for high-viscosity materials based on a porous retaining plate. The method, based on the aforementioned rotary film evaporator for high-viscosity materials based on a porous retaining plate, includes the following steps: The material enters the evaporator cylinder through the material inlet. After entering the evaporator cylinder, the material first enters the annular distributor. The material in the annular distributor is evenly distributed onto the porous retaining plates below through the first and second distribution ports. Driven by the rotary drive device, the rotary drive device drives each porous retaining plate to rotate through the rotary transmission shaft. Part of the material on the porous retaining plates flows downward through the retaining holes, while the other part flows downward from the edge of the porous retaining plates. During this period, the heating component heats the inside of the evaporator cylinder, and the stirring blades stir the material inside the evaporator cylinder. Finally, the gas evaporated from the material is discharged from the exhaust port of the evaporator cylinder, and the concentrated material is discharged from the material outlet.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention utilizes a rotary drive device to rotate a porous retaining plate via a rotary transmission shaft. Under the influence of centrifugal force and the guiding effect of the retaining holes, the material on the porous retaining plate is evenly spread across its surface, preventing localized material accumulation. Furthermore, the thickness of the material on the porous retaining plate can be adjusted by controlling the rotation speed of the rotary drive device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an external schematic diagram of the evaporation cylinder in the rotary film evaporator for high-viscosity materials based on a porous retaining plate, as described in Embodiment 1. Figure 2 This is a schematic diagram of the interior of the evaporation cylinder in the rotary film evaporator for high-viscosity materials based on a porous retaining plate, as described in Embodiment 1. Figure 3 This is a schematic diagram of the rotating film-coating assembly in the rotating film-coating evaporator for high-viscosity materials based on a porous retaining plate, as described in Embodiment 1. Figure 4 This is a schematic diagram of the annular distributor in the rotary film evaporator for high-viscosity materials based on a porous retaining plate, as described in Embodiment 1. Figure 5 This is a front view of the annular distributor in the high-viscosity material rotary film evaporator based on a porous retaining plate in Embodiment 1. Figure 6 This is a schematic diagram of the heat exchange tube structure in the high-viscosity material rotary film evaporation device based on a porous retaining plate in Embodiment 1. In the diagram: 1-Evaporation cylinder; 101-Material inlet; 102-Exhaust port; 103-Material outlet; 104-Motor mounting port; 105-Cylinder mounting bracket; 2-Rotating film distribution assembly; 201-Rotating drive device; 202-Rotating transmission shaft; 203-Perforated intercepting plate; 204-Intercepting hole; 205-Stirring blade; 206-Connecting flange; 3-Heating assembly; 301-Heat exchange tube; 4-Annular distributor; 401-First distribution port; 402-Second distribution port. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a rotary film evaporation device and evaporation method for high-viscosity materials based on a porous retaining plate, so as to solve the problems existing in the prior art and enable the material to be evenly distributed on the porous retaining plate.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 like Figures 1-6 As shown, this embodiment provides a rotary film evaporation device for high-viscosity materials based on a porous retaining plate, including an evaporation cylinder 1. The evaporation cylinder 1 contains a rotary film-laying assembly 2 and a heating assembly 3, which heats the interior of the evaporation cylinder 1. The evaporation cylinder 1 is a cylindrical container with a polished inner wall and no structural dead corners. The evaporation cylinder 1 has a material inlet 101 and an exhaust port 102. The material inlet 101 is connected to a material source via a pipeline, and a flow control valve is installed at the material inlet 101 to control the flow rate of the delivered material. The evaporated gas from the material inside the evaporation cylinder 1 can be discharged through the exhaust port 102. A material outlet 103 is located at the bottom of the evaporation cylinder 1, from which the concentrated material after evaporation can be discharged. A cylinder mounting bracket 105 is provided on each side of the outer wall of the evaporation cylinder 1 for fixing the evaporation cylinder 1.

[0023] The rotating film assembly 2 includes a rotating drive device 201, which can be an existing rotary motor. To facilitate the installation of the rotating drive device 201, a motor mounting port 104 is provided at the top of the evaporator cylinder 1. A connecting flange 206 is provided on the rotary motor, allowing the rotary motor to be connected to the motor mounting port 104 via the flange. The output shaft of the rotating drive device 201 can be connected to a rotating transmission shaft 202 via a coupling. The rotating transmission shaft 202 extends into the evaporator cylinder 1. Several porous retaining plates 203 are fixed to the rotating transmission shaft 202; typically, 2-4 porous retaining plates 203 are provided. Each porous retaining plate 203 has multiple retaining holes 204, with a diameter of 10mm-30mm. The retaining holes 204 are arranged in multiple rings from the inside to the outside, centered on the rotary drive shaft 202. Each ring has 8-24 retaining holes 204, for a total of 4-6 rings. If the hole diameter is too small, the liquid will not be able to pass through the porous retaining plate 203 due to surface tension, affecting the film formation. If the hole diameter is too large, excessive dripping will occur, preventing the formation of a more uniform liquid film, thus affecting the overall heat and mass transfer effect. The material entering through the material inlet 101 can be conveyed to the porous retaining plate 203, thereby utilizing the porous retaining plate 203 to form a film. The rotary drive device 201 is electrically connected to a control device, which can remotely control the rotary drive device 201. The control device can be an existing computer or other control terminal.

[0024] In actual use, the material to be evaporated enters through the material inlet 101 and flows onto the porous retaining plate 203. The porous retaining plate 203 rotates under the action of the rotary drive device 201. The material on the porous retaining plate 203 is evenly spread on its surface under the action of centrifugal force and the retaining holes 204. The thickness of the material on the surface of the porous retaining plate 203 can be adjusted by adjusting the rotation speed of the rotary drive device 201. The heating component 3 provides the heat required for evaporation. The gas evaporated from the material is discharged from the exhaust port 102, while the concentrated material after evaporation is discharged from the material outlet 103, thus completing the evaporation process.

[0025] In this embodiment, from Figures 2-3 As can be seen, the porous retaining plate 203 has a conical structure (or umbrella-shaped structure), and its diameter gradually increases from top to bottom. Under the impact of falling material, the porous retaining plate 203 can form a relatively uniform liquid film. The inclined sidewalls of the porous retaining plate 203 promote liquid film flow, and the retaining holes 204 on its surface facilitate the conversion of the liquid into different flow states. Specifically, Figure 2The angle between the inclined surface of the porous retaining plate 203 and the horizontal plane is 30°-40°. If the inclination angle is too small, the liquid film flow rate on the porous retaining plate 203 will decrease, which will cause backflow and is not conducive to the heat and mass transfer effect of the material. If the inclination angle is too large, the liquid film flow rate will increase, making it even more difficult to complete the heat and mass transfer effect of the material.

[0026] In this embodiment, as Figures 4-5 As shown, an annular distributor 4 is provided inside the evaporator cylinder 1. The annular distributor 4 has an annular inner cavity. The upper end of the annular distributor 4 is connected to the material inlet 101 through a distribution input pipe. The material input at the material inlet enters the annular inner cavity through the distribution input pipe. Multiple first distribution ports 401 are evenly distributed around the lower circumference of the annular distributor 4. The diameter of each first distribution port 401 is 1 / 16 to 1 / 14 of the inner diameter of the annular distributor 4, and the number of first distribution ports 401 is 16 to 20. Multiple rectangular second distribution ports 402 are evenly distributed around the inner circumference of the annular distributor 4, and the area of ​​each second distribution port 402 is 40% to 60% of the area of ​​the inner wall of the annular distributor 4.

[0027] In actual use, the material flowing into the annular distributor 4 will flow out through the first uniform distribution port 401 and the second uniform distribution port 402. The material flowing out from the first uniform distribution port 401 will fall to the edge of the annular distributor 4 below, and the material flowing out from the second uniform distribution port 402 will fall to the vicinity of the middle of the annular distributor 4 below, thereby achieving uniform distribution of the material.

[0028] In this embodiment, the first evenly distributed port 401 is a straight pipe structure or a tapered pipe structure. Figure 5 The first uniformly distributed nozzle 401 is a vertically arranged straight pipe structure. The tapered pipe structure is a variable diameter pipe with a diameter that gradually increases from top to bottom, thereby increasing the spraying range of the first uniformly distributed nozzle 401. The cone angle of the tapered pipe structure ranges from 0° to 30°.

[0029] In this embodiment, the heating assembly 3 includes a heat exchange tube 301 filled with a heat exchange medium, which includes, but is not limited to, hot water or heat transfer oil. Both ends of the heat exchange tube 301 are connected to a circulation pipeline, which is equipped with a circulation heating device. The low-temperature heat exchange medium flowing out of the heat exchange tube 301 flows into the circulation heating device under the transport action of the circulation pipeline. The circulation heating device heats the heat exchange medium to increase its temperature. Then, the high-temperature heat exchange medium flows back into the heat exchange tube 301 through the circulation pipeline, thereby providing heat to the evaporator cylinder 1.

[0030] The circulating heating equipment includes heaters (including but not limited to boilers) and reboilers connected in series. Of course, those skilled in the art can also use other devices capable of heating hot water, and are not limited to this one.

[0031] In this embodiment, the heat exchange tubes 301 are spirally distributed. Specifically, the heat exchange tubes 301 are spirally distributed at equal intervals around the rotating drive shaft 202, and are adapted to the dynamic stirring trajectory of the stirring blades 205 to enhance the dynamic heat exchange effect of highly viscous materials. The two ends of the heat exchange tubes 301 are detachably connected to the heat exchange inlet and outlet on the evaporation cylinder 1, specifically through flanges or quick-connect fittings. The pitch of the heat exchange tubes 301 is 70mm-150mm; in actual use, it can be adjusted according to the material's dynamic viscosity μ (within 10). -3 -10 5 Variations within the mPa·s range, with reverse coupling to set the helical pitch: When handling high viscosity or high heat transfer load conditions, a small-pitch heat exchanger tube 301 is used, significantly increasing the heat transfer area per unit length and enhancing turbulence; when handling low viscosity or low heat transfer load conditions, a large-pitch heat exchanger tube 301 is used to reduce pressure drop and flow resistance. This achieves a relationship between the heat transfer area A and the material viscosity μ according to A∝μ. (-0.2～-0.5) Power-law adaptive matching takes into account the high-efficiency and low-consumption heat exchange requirements of materials with different viscosities.

[0032] In this embodiment, as Figures 2-3 As shown, multiple stirring blades 205 are provided on the side wall of the rotary drive shaft 202, and the stirring blades 205 have a plate-like structure. Each stirring blade 205 is arranged in 2-4 layers along the axial direction of the rotary drive shaft 202, and 3-6 stirring blades 205 are evenly distributed in each layer along the circumference. The radial gap between the outer edge of the stirring blade 205 and the heat exchange tube 301 is 5mm-10mm.

[0033] In this embodiment, the outer wall of the evaporation cylinder 1 is provided with a heat insulation layer, which is made of rock wool. A stainless steel protective layer is provided on the outside of the heat insulation layer to fix it. The heat insulation layer is used to keep the evaporation cylinder 1 warm, reduce heat loss, and thus improve the evaporation efficiency of the material.

[0034] In this embodiment, a laser sensor, a temperature sensor, and a liquid level sensor are provided on the inner wall of the evaporation cylinder 1. The laser sensor is used to detect the thickness of the material film on the porous retaining plate 203, the temperature sensor is used to detect the temperature inside the evaporation cylinder 1, and the liquid level sensor is used to detect the liquid level inside the evaporation cylinder 1. It is necessary to ensure that the liquid level inside the evaporation cylinder 1 is higher than the highest stirring blade 205 and lower than the lowest porous retaining plate 203. In addition, a vibration sensor can be provided on the rotary drive device 201 to detect the vibration state of the rotary drive device 201 during use. The laser sensor, temperature sensor, liquid level sensor, and vibration sensor are all electrically connected to the control device, so that the relevant detection data can be transmitted to the control device. Based on the detection data, the control device then controls the operation of the rotary drive device 201.

[0035] Specifically, if the liquid level sensor detects that the liquid level inside the evaporation cylinder 1 is too high or too low, the control device receives the detection signal and then controls the flow control valve to reduce or increase the amount of material input.

[0036] If the laser sensor detects that the material thickness on the porous retaining plate 203 is too high or too low, the control device receives the detection signal and then adjusts the rotation of the rotary drive device 201 to increase or decrease the rotation speed of the porous retaining plate 203.

[0037] Example 2 This embodiment provides an evaporation method for a rotary film evaporator for high-viscosity materials based on a porous retaining plate, which is based on the rotary film evaporator for high-viscosity materials based on a porous retaining plate disclosed in Embodiment 1, and includes the following steps: The material enters through the material inlet 101 of the evaporator cylinder 1. After entering the evaporator cylinder 1, the material first enters the annular distributor 4. The material in the annular distributor 4 is evenly distributed onto the porous retaining plate 203 below through the first uniform distribution port 401 and the second uniform distribution port 402. Driven by the rotary drive device 201, the rotary drive device 201 drives each porous retaining plate 203 to rotate through the rotary transmission shaft 202 at a rotation speed of 20 r / min-50 r / min. Under the centrifugal force and the guiding effect of the conical plate surface of the porous retaining plate 203, the material is evenly spread along the surface of the porous retaining plate 203 to form a dynamic film with controllable thickness, significantly increasing the contact area between the material and the porous retaining plate 203 and inhibiting local accumulation. Some of the material on the porous retaining plate 203 flows downward through the retaining holes 204, while another part of the material flows downward from the edge of the porous retaining plate 203. During this period, the heating component 3 heats the interior of the evaporation cylinder 1, and the stirring blades 205 stir the material inside the evaporation cylinder 1. The plate-shaped stirring blades 205 form a forced circulation, disturbing and breaking up material agglomerates, disrupting the heat transfer boundary layer, and forming a dynamic heat exchange linkage with the spiral heat exchange tubes 301, greatly promoting the heat transfer of highly viscous materials. Finally, the gas evaporated from the material is discharged from the exhaust port 102 of the evaporation cylinder 1. The exhaust port 102 can be connected to a gas collection container through an exhaust pipe. Furthermore, a condenser can be installed on the exhaust pipe to cool the gas, thereby facilitating the re-collection of the gas. The concentrated material is discharged from the material outlet 103.

[0038] Example 3 This embodiment provides a specific example of a rotary film evaporation device for high-viscosity materials based on a porous retaining plate.

[0039] In the laboratory, deionized water was used to verify the enhanced evaporation performance of the rotary film evaporator for high-viscosity materials based on a porous retaining plate in Example 1. The temperature of the heat exchange inlet (i.e., the inlet of heat exchange tube 301) was maintained at 80°C, the mass flow rate of deionized water at the material inlet 101 was controlled at 0.008 kg / s, the diameter of the first uniform distribution port 401 was 1 / 15 of the inner diameter of the annular distributor 4, there were 18 such ports 401, and they were evenly distributed. The first uniform distribution port 401 was a straight pipe structure. The inclination angle of the porous retaining plate 203 was 30°, there were 3 such plates, the diameter of the retaining holes 204 on the porous retaining plate 203 was 10 mm, there were 10 holes per revolution, and a total of 5 revolutions. The rotation speed of the rotary drive device 201 was 25 r / min.

[0040] In this embodiment, compared with a traditional evaporator, the amount of deionized water evaporated by the high-viscosity material rotary film evaporation device based on a porous retaining plate is increased by about 3.69 times.

[0041] Example 4 This embodiment provides a specific example of a rotary film evaporation device for high-viscosity materials based on a porous retaining plate.

[0042] To verify the enhanced evaporation performance of the device of the present invention for high-viscosity materials, a new experimental platform was constructed. The high-viscosity material used was polypropylene melt with a viscosity of 800 mPa·s and a temperature of 180℃. The diameter of the evaporation cylinder 1 is 1200 mm, and the effective height of the evaporation cylinder 1 is 3500 mm. The inner wall is mirror-polished. The top is provided with an exhaust port 102 connected to the condenser, the bottom is provided with a material outlet 103, and the side is provided with a heat exchange inlet (connected to the inlet of the heat exchanger) and a heat exchange outlet (connected to the outlet of the heat exchanger). An annular distributor is coaxially arranged in the upper part of the evaporation cylinder 1. The outer diameter of the annular distributor is 1000 mm. Twenty-four first distribution ports 401 are opened in the circumferential direction at the lower end of the annular distributor. The aperture of the first distribution port 401 is 25 mm. The first distribution port 401 is a conical tube structure with a cone angle of 30° to avoid polymer material sticking. In the rotating membrane assembly 2, the rotating drive device 201 has a power of 15kW and a speed range of 0-100r / min. The porous retaining plate 203 has three layers and is made of 316L stainless steel. The inclination angle of the porous retaining plate 203 is 35°, the maximum diameter of the porous retaining plate 203 is 600mm, the diameter of the retaining holes 204 is 10mm, 10 retaining holes 204 are evenly distributed in each ring, and the total number of rings of retaining holes 204 is 7. The stirring blades 205 have a total of four layers and are made of Hastelloy. Each layer of stirring blades 205 has 4 blades evenly distributed circumferentially, and the radial gap between the outer edge of the stirring blades 205 and the inner wall of the heat exchange tube 301 is 8mm. The heat exchange tube 301 is made of 316L stainless steel, with a diameter of 57mm and a wall thickness of 3mm. It is spirally distributed at equal intervals around the rotating drive shaft 202 with a pitch of 120mm. The two ends of the heat exchange tube 301 are connected to the heat exchange inlet and heat exchange outlet through flanges. The heat exchange medium is heat transfer oil with a working temperature of 220℃.

[0043] Under the operating conditions of the rotary film evaporator for high-viscosity materials based on a porous retaining plate in this embodiment, the temperature at the material outlet 103 steadily decreased from 68°C under traditional evaporator conditions to 62°C, achieving a polypropylene monomer removal rate of 95.8%. The temperature drop is positively correlated with the removal rate: since polymerization is an exothermic process, the faster the evaporation rate, the more thorough the monomer removal, and the more significant the outlet temperature technical indicators. This invention improves upon existing evaporators by 12%. Simultaneously, the unit energy consumption of the device is reduced by 18%, and the continuous operating cycle is extended by 60%, fundamentally solving the common problems of difficult film application, easy coking, and frequent maintenance during monomer removal from polymer melts.

[0044] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0047] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0048] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0049] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0050] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0051] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0052] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A rotary film evaporation device for high-viscosity materials based on a porous retaining plate, characterized in that: It includes an evaporation cylinder (1), which is provided with a rotating film-making assembly (2) and a heating assembly (3). The heating assembly (3) is used to heat the inside of the evaporation cylinder (1). The evaporation cylinder (1) is provided with a material inlet (101). The rotating film assembly (2) includes a rotating drive device (201), the output shaft of which is connected to a rotating transmission shaft (202). Several porous retaining plates (203) are fixed on the rotating transmission shaft (202). Each porous retaining plate (203) is provided with multiple retaining holes (204). Material entering from the material inlet (101) can be transported to the porous retaining plate (203). The rotating drive device (201) is electrically connected to a control device.

2. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 1, characterized in that: The porous retaining plate (203) has a conical structure, and the diameter of the porous retaining plate (203) gradually increases from top to bottom.

3. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 1, characterized in that: The evaporation cylinder (1) is provided with an annular distributor (4). The upper end of the annular distributor (4) is connected to the material inlet (101). The lower end of the annular distributor (4) is evenly distributed with a plurality of first distribution ports (401). The inner wall of the annular distributor (4) is evenly distributed with a plurality of second distribution ports (402).

4. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 3, characterized in that: The first uniformly distributed port (401) is a straight pipe structure or a tapered pipe structure.

5. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 1, characterized in that: The heating component (3) includes a heat exchange tube (301), which is filled with a heat exchange medium. Both ends of the heat exchange tube (301) are connected to a circulation pipeline, and a circulation heating device is provided on the circulation pipeline.

6. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 5, characterized in that: The heat exchange tubes (301) are arranged in a spiral pattern.

7. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 1, characterized in that: The side wall of the rotary drive shaft (202) is provided with multiple stirring blades (205).

8. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 1, characterized in that: The outer wall of the evaporator cylinder (1) is provided with a heat insulation layer.

9. The rotary film evaporator for high-viscosity materials based on a porous retaining plate according to claim 1, characterized in that: The inner wall of the evaporation cylinder (1) is provided with a laser sensor, a temperature sensor and a liquid level sensor, and the laser sensor, the temperature sensor and the liquid level sensor are all electrically connected to the control device.

10. An evaporation method for a rotary film evaporator for high-viscosity materials based on a porous retaining plate, characterized in that, The rotary film evaporator for high-viscosity materials based on a porous retaining plate, according to any one of claims 1-9, comprises the following steps: The material enters through the material inlet (101) of the evaporator (1). After entering the evaporator (1), the material first enters the annular distributor (4). The material in the annular distributor (4) is evenly distributed on the porous retaining plate (203) below through the first uniform distribution port (401) and the second uniform distribution port (402). Driven by the rotary drive device (201), the rotary drive device (201) drives each porous retaining plate (203) to rotate through the rotary transmission shaft (202). Part of the material on the porous retaining plate (203) will flow downward through the retaining hole (204), and another part of the material will flow downward from the edge of the porous retaining plate (203). During this period, the heating component (3) heats the inside of the evaporator (1), and the stirring blade (205) stirs the material in the evaporator (1). Finally, the gas evaporated from the material will be discharged from the exhaust port (102) of the evaporator (1), and the concentrated material will be discharged from the material outlet (103).

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