Wiped film evaporator and gas-liquid separation method

Abstract

Disclosed are a wiped film evaporator and a gas-liquid separation method. The wiped film evaporator comprises a cylinder body and a rotor, and a top support assembly of the rotor comprises a plurality of vertical plates and a plurality of layers of baffles arranged between the plurality of vertical plates; the plurality of layers of baffles are alternately staggered. The wiped film evaporator and the gas-liquid separation method make more liquid droplets be settled and improve the purity and quality of steam through the plurality of settling channels separated by the plurality of vertical plates and the zigzag flow path formed by the staggered arrangement of the plurality of layers of baffles.

Description

Technical Field

[0001] This invention relates to the technical field of chemical equipment, and in particular to a scraped film evaporator and a gas-liquid separation method. Background Technology

[0002] A scraped film evaporator is a type of thin-film evaporator used in the evaporation and purification of high-viscosity, heat-sensitive, and solid-containing materials in industries such as chemical, pharmaceutical, and food processing.

[0003] A typical scraped-film evaporator consists of a cylinder and a rotor housed within the cylinder. The rotor includes a central shaft, support assemblies connected to both ends of the shaft, and several scrapers or blades. One end of the shaft is also connected to a drive motor, which drives the shaft to rotate. This causes the scrapers or blades to continuously and evenly press the material onto the inner wall of the cylinder, forming a thin film on the inner wall. Under the high temperature of the cylinder's sidewalls, the liquid in the material vaporizes into steam, which is then discharged. In this process, the material fed into the cylinder is a high-viscosity, heat-sensitive solute or solvent. The liquid phase remaining after evaporation is a concentrated liquid, and the vaporized steam (gas phase) is a purified solvent, constituting the steam product.

[0004] In the existing technology, the primary evaporation steam at the top is not pure enough and contains impurities such as mist, which makes the purified steam not pure enough and causes the quality of the exported steam product to decline. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of low steam purity and low quality in the existing technology of scraped film evaporators, and to provide a scraped film evaporator and a gas-liquid separation method.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A scraped film evaporator includes a cylindrical body and a rotor disposed within the cylindrical body. The rotor includes a rotating shaft and a top support assembly located at the top of the rotating shaft. The top support assembly includes a plurality of vertical plates radially distributed from the rotating shaft along the inner wall of the cylindrical body and extending along the axial direction of the rotating shaft, and a multi-layer baffle disposed between the plurality of vertical plates. The multi-layer baffles are arranged at intervals and staggered to form a tortuous upward flow path for steam.

[0008] In this design, the scraped film evaporator enhances the structural strength of the top support assembly through several vertical plates, increasing the steam contact area and allowing for greater droplet condensation. These vertical plates divide the top space of the cylinder into multiple steam settling channels, improving the uniformity of steam distribution and enhancing droplet settling efficiency and steam product quality. Within each settling channel, multiple layers of baffles, arranged in a staggered pattern, create a tortuous upward flow path for the steam, extending the flow time and allowing more droplets to settle, be recovered, and re-evaporated, thus improving steam purity and quality. Furthermore, the multiple layers of baffles in different settling channels can be arranged in different alternating staggered patterns, resulting in varying airflow velocities as the rotor rotates, further enhancing turbulence and improving settling efficiency and steam quality.

[0009] Preferably, the multi-layer baffle includes a first baffle located on one side of the rotating shaft and a second baffle located on one side of the inner wall of the cylinder. The first baffle and the second baffle are both arranged along the cross-section of the rotating shaft and are alternately staggered along the axial direction of the rotating shaft to form a tortuous upward flow path for steam.

[0010] In this scheme, both the first and second baffles are arranged with cross sections along the axis of rotation, forming a tortuous flow path for the steam that first flows horizontally and then rises axially. The long flow path is beneficial to the settling effect, and the two baffles are arranged in a regular direction with a simple structure.

[0011] Preferably, both the first baffle and the second baffle are annular baffles that penetrate vertically through each of the vertical plates and are fixedly connected to each of the vertical plates.

[0012] In this design, the first and second baffles are annular baffles that pass vertically through each vertical plate and are fixedly connected to each vertical plate. Thus, the first and second baffles are integral annular baffles, which have a simple structure and enhance the overall structural strength.

[0013] Preferably, along the radial direction from the pivot to the inner wall of the cylinder, the first baffle includes a first body and a first bent portion connected in sequence, and the second baffle includes a second bent portion and a second body connected in sequence.

[0014] The first body and the second body are arranged along the cross-section, the first bent portion is inclined downward and the second bent portion is inclined upward.

[0015] In this design, the aforementioned inclined arrangement prevents steam from passing through, as it is blocked by two bends, making it easier for droplets to collect. Furthermore, the inclined arrangement creates a curved flow channel between the first and second baffles, rather than a straight transverse channel, which helps to extend the flow path. With this inclined arrangement, droplets easily collect on the inner wall of the cylinder, where they are scraped and flow downwards, then evaporate again, effectively recycling the droplets.

[0016] Preferably, the multi-layer baffle includes a first baffle located on one side of the rotating shaft and a second baffle located on one side of the inner wall of the cylinder. The first baffle and the second baffle are both inclined in the same direction to the cross-section of the rotating shaft and are arranged alternately and staggered along the axial direction of the rotating shaft.

[0017] In this scheme, the above-mentioned inclined arrangement is adopted, and the surfaces of the two baffles form a spiral structure relative to the vertical plate, rather than a completely horizontal surface. This makes it easier for the steam to contact the baffles when it passes horizontally between the first and second baffles, condensing the droplets and forming eddies. This prolongs the residence time of the steam in the settling channel, thereby improving the settling effect.

[0018] Preferably, along the direction of steam rise, an annular collecting dish is provided at the initial end of the top support assembly along the inner wall of the cylinder, with the opening of the collecting dish facing the inner wall of the cylinder;

[0019] The radial outer edge of the second baffle at the initial end of the top support assembly is positioned above the collection tray, so that droplets collected on the second baffle fall into the collection tray.

[0020] In this design, a collection tray collects and gathers droplets condensed on the baffle surface, removing vaporous mist generated on the surface of the steam material. The collected droplets flow down the inner wall of the cylinder and are evaporated again. The collection tray intercepts droplets in the steam, while the non-condensable steam rises and enters downstream equipment of the evaporator for gas-liquid separation, preventing impure droplets from flowing into downstream equipment and thus protecting it. The collected droplets flow back to the evaporation section, achieving a re-evaporation cycle and continuously removing impurities from the droplets, thereby improving steam quality. In existing technologies using wire mesh demisters, droplets or impurities in the feed easily clog the wire mesh, making cleaning difficult. Therefore, compared to existing technologies, this scraped film evaporator uses a collection tray, which also removes vaporous mist, avoids impurity clogging, and is easy to clean.

[0021] Preferably, the collecting tray is connected to the vertical plate; along a direction opposite to the rising direction of the steam, an annular distribution ring is connected below the collecting tray, the distribution ring including a bent section extending obliquely towards the inner wall of the cylinder and fitting with the inner wall of the cylinder with a clearance, the opening of the collecting tray is located above the bent section, so that droplets drip from the opening of the collecting tray onto the surface of the bent section, the bent section being used to throw the droplets onto the inner wall of the cylinder when rotating with the rotating shaft.

[0022] In this design, the collecting tray is connected to the vertical plate, and the distribution ring is connected to the collecting tray, allowing both the distribution ring and the collecting tray to rotate with the rotor. The annular distribution ring collects droplets falling from the collecting tray and droplets that accumulate on the inner wall of the cylinder and then drip. As the distribution ring rotates with the rotor, the collected droplets are thrown onto the inner wall of the cylinder, distributing evenly across its circumferential inner surface. This promotes uniform droplet distribution and improves the quality of the evaporated liquid. The bent section is inclined inwards to collect droplets from both the collecting tray and the inner wall of the cylinder; the gap fit between the bent section and the inner wall prevents the distribution ring from scratching the inner wall during rotation.

[0023] Preferably, the bent segment extends downward or horizontally.

[0024] In this design, the bending section extends in the aforementioned direction, allowing the droplets to flow smoothly out of the bending section.

[0025] Preferably, the rotor further includes an intermediate support assembly located in the middle section of the shaft and a bottom support assembly located at the bottom of the shaft;

[0026] The intermediate support assembly includes a plurality of intermediate support rings stacked along the axial direction. Each of the plurality of intermediate support rings includes an outer ring, an inner ring, and a radial connecting rod connecting the outer ring and the inner ring. The rotating shaft passes through the inner ring.

[0027] The rotor also includes a tie rod that passes through each of the outer rings and is connected to the top support assembly and the bottom support assembly.

[0028] In this design, the aforementioned intermediate support rings and radial connecting rods form a hollow structure, reducing the overall weight. This is particularly beneficial for large-capacity rotor structures, as it lowers rotor rotation resistance and improves production efficiency. A shaft passes through the inner ring, and tie rods penetrate each outer ring, connecting to the top and bottom support components. This strengthens the rotor's structural strength and increases rigidity on both the inner and outer sides. Steam passing through the hollow structure and contacting the intermediate support rings facilitates the condensation and settling of entrained liquid droplets.

[0029] Preferably, a plurality of heating sections are attached to the outer wall of the cylinder, each of the plurality of heating sections including a coil structure spirally wound on the outer wall of the cylinder, and an externally input heat-conducting medium flows through the coil structure.

[0030] In this design, the material inside the cylinder is heated by a heating section on the outer wall of the cylinder, evaporating low-boiling-point substances. Multiple heating sections can use the same or different heat transfer media, and different sections can generate the same or different heating temperatures to better adapt to the heating needs of different materials or to accommodate changes in the flow of the thin film on the inner wall of the cylinder, thereby improving evaporation efficiency and the quality of the steam product. A coil structure is employed, resulting in high heat transfer efficiency.

[0031] Preferably, the ratio of the total length of the plurality of heating sections along the axial direction of the cylinder to the diameter of the cylinder is in the range of 3 to 7.

[0032] In this solution, the above settings ensure that the heating section effectively heats the material, and the material will not be insufficiently heated due to the cylinder diameter being too large or the total length of the heating section being too short.

[0033] Preferably, the coil structure includes an inner coil and an outer coil, and is configured such that one outer coil is stacked between two adjacent inner coils to eliminate the gap between the two adjacent inner coils; the inner coils and the outer coils in different heating sections are filled with heat-conducting media of the same or different temperatures.

[0034] In this design, the double-coil structure increases the heat conduction area and improves heat transfer efficiency, while avoiding the need to extend the cylinder length. Furthermore, the increased heat conduction area enhances heat output, allowing the thin film on the inner wall of the cylinder to evaporate more fully, thus improving steam quality.

[0035] Preferably, the bottom end of the rotating shaft is connected to a bearing and a bearing sleeve that mates with the bearing. The scraped film evaporator also includes an external pipe located outside the cylinder, the external pipe having an input end and an output end. The output end is connected to the inner cavity of the bearing sleeve. The input end is connected to a lubricating fluid supply source near the bottom of the cylinder. The lubricating fluid supply source is located above the bearing sleeve. The lubricating fluid supply source stores a lubricating fluid that is different from the product gas evaporated by the scraped film evaporator.

[0036] In this design, the scraped film evaporator utilizes a lubricant supply source different from the product gas to provide lubricant for the bearings. This avoids product waste and increases product yield; it also shortens the lubricant supply pipeline, reducing lubrication supply costs. Positioning the lubricant supply source above the bearing sleeve allows the lubricant to flow directly to the bearing sleeve under its own weight, achieving self-lubrication without requiring an additional power source to drive the lubricant flow, further reducing equipment costs.

[0037] Preferably, the lubricant supply source includes a liquid collection tray disposed on the inner wall of the cylinder, the liquid collection tray being used to collect liquid on the inner wall of the cylinder as lubricant for the bearing sleeve;

[0038] And / or, the lubricant supply source includes a lubricant storage container located outside the cylinder.

[0039] In this solution, when the liquid collection tray on the inner wall of the cylinder is used as the lubricant supply source, the liquid on the inner wall of the cylinder can be fully utilized as the lubricant. This eliminates the need for additional lubricant and avoids the consumption of product gas, thus preventing product gas waste and reducing lubrication costs. When the lubricant storage container on the outside of the cylinder is used as the lubricant supply source, the appropriate dedicated lubricant can be supplied according to the required lubrication effect, instead of product gas or the liquid on the inner wall of the cylinder, thereby improving the lubrication effect. By using two different types of lubricant supply sources, different types of lubricant supply sources can be flexibly selected according to different operating conditions.

[0040] Preferably, the bearing sleeve is connected to the cylinder through a plurality of bearing supports; at least one of the plurality of bearing supports is a bearing support tube with a hollow inner hole, and the output end is connected to the inner cavity of the bearing sleeve through the bearing support tube; the position of the lubricant supply source is higher than the position of the bearing support tube.

[0041] In this design, the bearing sleeve is fixedly connected to the cylinder through several bearing support components, thereby improving the support strength. The bearing support components adopt bearing support tubes with hollow inner holes, which can both support the bearing and transfer lubricating fluid from external pipelines to the bearing sleeve, integrating two different functions. No additional lubricating fluid delivery pipeline is required inside the cylinder, simplifying the lubricating fluid delivery structure.

[0042] Preferably, there are multiple bearing support tubes, which are radially distributed along the circumference of the bearing sleeve, and one or more external pipes are respectively connected to the bearing support tubes at different positions along the circumference.

[0043] In this design, the bearing support pipes are connected to bearing support pipes at different locations along the circumference via one or more external pipes. When one bearing support pipe becomes blocked, other bearing support pipes can deliver lubricating fluid, ensuring unobstructed flow. Furthermore, the lubricating fluid supplies the bearing from different directions, which is beneficial for lubrication uniformity and efficiency.

[0044] Preferably, the scraped film evaporator further includes a flange assembly and a discharge cylinder connected to the bottom of the cylinder body. The flange assembly includes an upper flange and a lower flange. The upper flange is clamped on the bottom outer surface of the cylinder body, and the lower flange is clamped on the top outer surface of the discharge cylinder.

[0045] The output end is connected to the bearing support pipe through an output through hole provided on the upper flange, an output through hole provided on the lower flange, or an output through hole provided between the upper flange and the lower flange.

[0046] In this design, compared to bearing assemblies directly connected to the cylinder, this scraped film evaporator enhances the connection strength between the cylinder and the discharge cylinder through flange assemblies, resulting in a more stable structure. External pipes are connected to the flange assemblies, utilizing the high strength of the flange assemblies to support the external pipes, further ensuring structural stability. The flange assemblies feature a split structure, facilitating removal from the cylinder for bearing assembly replacement and maintenance.

[0047] Preferably, the lubricant supply source includes a liquid collection tray disposed on the inner wall of the cylinder, the liquid collection tray being used to collect liquid on the inner wall of the cylinder as lubricant for the bearing sleeve;

[0048] The input end is connected to the liquid receiving tray through an input through hole provided on the upper flange, and the output through hole is provided on the lower flange or between the upper flange and the lower flange.

[0049] In this scheme, the liquid collection tray is connected to the input end through the input through hole of the upper flange. The input end of the external pipeline is fixed by the structural strength of the upper flange. The good structural strength ensures that the liquid collected by the liquid collection tray is output stably.

[0050] A gas-liquid separation method includes the following steps:

[0051] Provide scraped film evaporators;

[0052] The material to be separated is fed into the cylinder of the scraped film evaporator and distributed to the inner wall of the cylinder.

[0053] The rotor of the scraped film evaporator is driven to rotate, which in turn drives the scraper on the rotor to cut the material to be separated on the inner wall of the cylinder, forming a thin film containing a liquid mixture;

[0054] The film is heated to separate vapor and concentrated solvent from the film;

[0055] The top space of the cylinder is divided into multiple channels extending along the axial direction of the cylinder;

[0056] Each of the multiple channels is separated into a settling channel by multiple layers of baffles arranged at staggered intervals.

[0057] The steam is heated, causing it to rise and pass through the settling channels and the multi-layered baffles in each settling channel, so that the heavy liquid components in the steam condense into droplets, yielding the remaining light component steam product.

[0058] In this scheme, the gas-liquid separation method achieves the evaporation and separation of materials through the above steps. In particular, by heating the steam and passing it through multiple settling channels and multiple baffles in each settling channel, the steam flow rate is slowed down, so that more heavy liquid components in the steam can be condensed into droplets, thereby improving the settling effect and the purity of the steam product.

[0059] Preferably, the ratio of the diameter of the cylinder to the number of the settling channels is in the range of 0.16 to 0.3.

[0060] In this scheme, the above ratio range is adopted so that the number of settling channels is adapted to the diameter of the cylinder, which is conducive to ensuring the settling effect and the quality of steam products.

[0061] Preferably, the number of settlement channels ranges from 4 to 12.

[0062] In this scheme, using the aforementioned number of settlement channels is beneficial to improving the settlement effect.

[0063] Preferably, the gas-liquid separation method further includes: controlling the total output Q of the steam product so that the flow rate V of the steam product meets the following condition: V is in the range of 3.2~5.1 m / s;

[0064] Where V=Q / S, S=π×A×H, S is the cross-sectional area of ​​the settling channel, A is the radial distance between the two baffles on the same horizontal plane inside the cylinder, H is the axial distance between two adjacent baffles, and π is the constant of pi.

[0065] The total output of the steam product is related to the feed rate of the material to be separated, the working pressure inside the cylinder, the heating temperature, and the rotational speed of the rotor.

[0066] In this scheme, the gas-liquid separation method controls the total output Q of the steam product to meet the above conditions, so that the steam can maintain its fluidity and be fully settled in the settling channel, removing the heavy liquid components in the steam and improving the purity of the steam product.

[0067] Preferably, the step of feeding the material to be separated into the cylinder of the scraped film evaporator includes: feeding the material to be separated into the cylinder at different positions along the circumference of the cylinder.

[0068] In this scheme, the above steps improve the distribution efficiency and uniformity of materials, and also increase the feed rate, thereby improving the efficiency and flow rate of steam generation.

[0069] Preferably, the gas-liquid separation method further includes controlling the rotational speed of the rotor and the heating temperature of the cylinder, so that the thickness of the film is controlled within the range of 1 mm to 3 mm.

[0070] In this scheme, the above steps ensure that the film thickness is neither too thick nor too thin, keeping it within a range that allows for rapid evaporation, which is beneficial for improving steam quality. Furthermore, compared to adjusting the film thickness by adjusting the distance between the scraper and the inner wall of the cylinder, this method is easier to implement and simpler to operate.

[0071] Preferably, the gas-liquid separation method further includes setting the heating temperature of the cylinder to gradually increase or decrease along the flow direction of the film on the inner wall of the cylinder.

[0072] In this scheme, the above steps generate a temperature gradient on the cylinder, which better adapts to the changes in heat requirements during the separation of different materials, ensuring that the film at every position in the flow direction can be rapidly evaporated, improving evaporation efficiency, and thus increasing the output of steam products.

[0073] Preferably, the scraped film evaporator is a scraped film evaporator as described above.

[0074] In this scheme, the gas-liquid separation method uses the aforementioned scraped film evaporator, which is beneficial to improving the sedimentation effect, thereby improving the purity and quality of the steam.

[0075] The positive and progressive effects of this invention are as follows: The scraped film evaporator and gas-liquid separation method enhance the structural strength of the top support assembly through several vertical plates, increasing the steam contact area and allowing more droplets to condense. The vertical plates divide the top space of the cylinder into multiple steam settling channels, which improves the uniformity of steam distribution, increases the efficiency of droplet settling, and enhances the quality of the steam product. Within each settling channel, multiple layers of baffles, arranged in a staggered pattern, create a tortuous upward flow path for the steam, extending the flow time and allowing more droplets to settle, be recovered, and re-evaporated, thus improving the purity and quality of the steam. Furthermore, the multiple layers of baffles in different settling channels can be arranged in different alternating staggered patterns, so that after the rotor rotates, the steam follows different tortuous flow paths in different settling channels, generating airflows with different velocities, better turbulence, and further improving the settling effect and steam quality. Attached Figure Description

[0076] Figure 1 This is a half-sectional schematic diagram of the scraped film evaporator of Embodiment 1 of the present invention.

[0077] Figure 2 This is a three-dimensional structural diagram of the scraped film evaporator of Embodiment 1 of the present invention after the drive motor at the top of the cylinder is removed.

[0078] Figure 3 for Figure 2 A schematic diagram of the half-section structure.

[0079] Figure 4 This is a schematic diagram of the rotor structure of Embodiment 1 of the present invention.

[0080] Figure 5 This is a schematic diagram of the top support assembly inside the cylinder according to Embodiments 1 and 2 of the present invention.

[0081] Figure 6 This is a partial structural diagram of the top support assembly within the cylinder according to Embodiment 1 of the present invention.

[0082] Figure 7 This is a schematic diagram of the structure of the intermediate support ring in Embodiment 1 of the present invention.

[0083] Figure 8 This is a schematic diagram of the heating section of Embodiment 1 of the present invention (view 1). The heating section in the figure omits the coil structure in the middle part.

[0084] Figure 9 This is a schematic diagram of the heating section of Embodiment 1 of the present invention (view 2). The heating section in the figure omits the coil structure in the middle part.

[0085] Figure 10This is a half-sectional view of a scraped film evaporator according to another embodiment of the present invention after removing the drive motor at the top of the cylinder. The heating section in the figure adopts a half-tube structure.

[0086] Figure 11 This is a half-sectional view of a scraped film evaporator according to another embodiment of the present invention after removing the drive motor at the top of the cylinder. The heating section in the figure adopts a jacket structure.

[0087] Figure 12 for Figure 1 A schematic diagram of the structure of local C.

[0088] Figure 13 To and Figure 12 Correspondingly, a half-sectional diagram of bearing lubrication is shown when a liquid collection pan is used as the lubricant supply source.

[0089] Figure 14 To and Figure 12 Correspondingly, a schematic diagram of the bearing lubrication structure when the external lubricant storage container of the cylinder is used as the lubricant supply source.

[0090] Figure 15 To and Figure 14 Correspondingly, a half-sectional diagram of bearing lubrication is shown when the lubricant storage container outside the cylinder is used as the lubricant supply source.

[0091] Figure 16 This is a schematic diagram of the internal structure of the external pipe in Embodiment 1 of the present invention.

[0092] Explanation of reference numerals in the attached figures:

[0093] Scraped film evaporator 100, cylinder 200;

[0094] Feed pipe 201, steam outlet 202, heating section 210, coil structure 220, inner coil 221, outer coil 222, input pipe 230, input main pipe 2301, input branch pipe 2302, output pipe 240, output main pipe 2401, output branch pipe 2402, half pipe 250, jacket 260;

[0095] Rotor 300, shaft 310, main body 311, connecting part 312, disc-shaped part 3121, mating part 3122, top support assembly 320, vertical plate 3201, baffle 3202, first baffle 3203, first body 32031, second bending part 32032, second baffle 3204, second body 32041, second bending part 32042, collecting plate 3205, distribution ring 3206, bending section 3207, ring body 3208, settling channel 321, intermediate support assembly 330, intermediate support ring 3300, outer ring 3301, inner ring 3302, radial connecting rod 3303, bottom support assembly 340, tie rod 350, scraper 360;

[0096] Bearing 400, bearing sleeve 401, bearing support tube 402, bearing support component 403, lubricating fluid supply source 500, liquid collection tray 510, lubricating fluid storage container 520, external pipe 600, filter 601, valve 602, sight glass 603, impeller 604, sensor 605, input end 606, input through hole 6061, output end 607, output through hole 6071;

[0097] Discharge cylinder 700, discharge port 710;

[0098] Drive motor 800, flange assembly 900, upper flange 901, lower flange 902, annular connector 903, steam rising direction B, droplet 10, tortuous flow path 20. Detailed Implementation

[0099] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0100] Example 1

[0101] This embodiment provides a scraped film evaporator 100, combined with... Figures 1-5 As shown, the scraped film evaporator 100 includes a cylindrical body 200 and a rotor 300 disposed within the cylindrical body 200. The rotor 300 includes a rotating shaft 310, a top support assembly 320 located at the top of the rotating shaft 310, an intermediate support assembly 330 located in the middle section of the rotating shaft 310, and a bottom support assembly 340 located at the bottom of the rotating shaft 310. The top support assembly 320 includes a plurality of vertical plates 3201 radially distributed from the rotating shaft 310 toward the inner wall of the cylindrical body 200 and extending along the axial direction of the rotating shaft 310, and a multi-layer baffle 3202 disposed between the plurality of vertical plates 3201; the multi-layer baffle 3202 are arranged at intervals and staggered to form a tortuous upward flow path for steam.

[0102] Specifically, in this embodiment, the cylinder 200 is a closed circular cylinder. A feed pipe 201 and a steam outlet 202 are located at the top of the cylinder 200, and a discharge cylinder 700 is connected to the bottom of the cylinder 200. The bottom of the discharge cylinder 700 has a discharge port 710. The middle section of the cylinder 200 is a heating section 210, and its outer wall is provided with a coil structure 220. A heat-conducting medium flows through the coil, and the heat from the heat-conducting medium is transferred to the material inside the cylinder 200, heating the material. In this embodiment, the top support assembly 320 of the rotor 300 includes eight vertical plates 3201 and five layers of baffles 3202. The vertical plates 3201 are approximately square flat plates extending roughly vertically (in the same direction as the rising steam direction B). Each vertical plate 3201 is welded to the rotating shaft 310 on the side closest to the center of the cylinder 200. The eight vertical plates 3201 are radially distributed from the rotating shaft 310 towards the inner wall of the cylinder 200 and extend axially along the rotating shaft 310 towards the top cover of the cylinder 200, dividing the top space of the cylinder 200 into eight settling channels 321. The baffles 3202 are annular flat plates that penetrate each vertical plate 3201 horizontally and are welded to each vertical plate 3201 as a single unit. The baffles 3202 and the vertical plates 3201 are perpendicular to each other. The surface area of ​​each annular baffle 3202 only occupies a portion of the total cross-section of the cylinder 200 from the inner wall of the cylinder 200 to the rotating shaft 310, that is, the annular baffles 3202 do not extend completely from the inner wall of the cylinder 200 to the rotating shaft 310. In two adjacent layers of baffles 3202, one layer of baffle 3202 is located near the inner wall of the cylinder 200 and radially spaced from the rotating shaft 310, while the other layer of baffle 3202 is connected to the rotating shaft 310 and radially spaced from the inner wall of the cylinder 200. This creates a radially staggered arrangement of adjacent layers of baffles 3202, and the five layers of baffles 3202 are vertically spaced, forming a staggered arrangement that creates a tortuous upward flow path for steam. Eight vertical plates 3201 divide each annular baffle 3202 into multiple fan-shaped sections. Within each settling channel 321, five vertically arranged fan-shaped sections are staggered, forming a smaller, tortuous upward flow path for steam. The intermediate support assembly 330 of the rotor 300 is connected to several scrapers 360 along its circumferential outer edge, and the scrapers 360 are positioned relative to the inner wall of the cylinder 200. One end (e.g., the top end) of the rotating shaft 310 passes through the cylinder 200 and is connected to the drive motor 800 located outside the cylinder 200.

[0103] When the scraped film evaporator 100 is working, the fluid material to be separated and purified is input from the feed pipe 201 and enters the inner cavity of the cylinder 200. It flows downward along the inner wall of the cylinder 200. In the middle section, the material is scraped into a thin film by the scraper 360 and heated and evaporated at the same time. The concentrated liquid left after evaporation is discharged from the bottom outlet 710, while the vaporized steam rises and passes through the settling channels 321 separated by multiple vertical plates 3201 at the top support component 320. In each settling channel 321, the steam flows in the tortuous flow path 20 formed by multiple baffles 3202. The heavy liquid components in the steam condense into droplets 10 on the surfaces of the baffles 3202, vertical plates 3201, etc., which separates the heavy liquid components entrained in the steam and produces a settling effect, thereby purifying the steam. The purified steam product flows out from the steam outlet 202 and enters the downstream equipment.

[0104] The scraped film evaporator 100 enhances the structural strength of the top support assembly 320 through several vertical plates 3201, increasing the steam contact area and allowing more droplets 10 to condense. The vertical plates 3201 divide the top space of the cylinder 200 into multiple steam settling channels 321, improving the uniformity of steam distribution and increasing the efficiency of droplet 10 settling and the quality of the steam product. Within each settling channel 321, multiple layers of baffles 3202, arranged at staggered intervals, create a tortuous upward flow path for the steam, extending the flow time and allowing more droplets 10 to settle, be recovered, and re-evaporated, thus improving the purity and quality of the steam. Simultaneously, the high-speed rotation of the rotor 300 causes the multiple layers of baffles 3202 within each settling channel 321 to turbulently flow the steam, further increasing droplet 10 condensation and accelerating settling efficiency. Furthermore, the multi-layer baffles 3202 in different settling channels 321 can be arranged in different alternating staggered positions so that after the rotor 300 rotates, the steam passes through different tortuous flow paths 20 in different settling channels 321, generating airflows with different flow rates, which better turbulence and further improves the settling effect and steam quality.

[0105] Among them, such as Figure 5 As shown, the multi-layer baffle 3202 includes a first baffle 3203 located on one side of the rotating shaft 310 and a second baffle 3204 located on one side of the inner wall of the cylinder 200. The first baffle 3203 and the second baffle 3204 are both arranged along the cross-section of the rotating shaft 310 (the cross-section is a plane perpendicular to the rotating shaft), and are arranged alternately and staggered along the axial direction of the rotating shaft 310 to form a tortuous upward flow path for steam.

[0106] It should be noted that in other embodiments, the number of vertical plates 3201 and the number of baffles 3202 can be increased or decreased as needed, and are not limited to the numbers described in this embodiment. The shape of the baffles 3202 can also be other shapes that can form a tortuous flow path. There are various ways to arrange the multi-layer baffles 3202 to form a tortuous flow path, and it is not limited to the horizontal staggered arrangement of this embodiment. For example, in other embodiments, the multi-layer baffles 3202 can also be arranged in an inclined, alternating, staggered manner. However, compared with other arrangements, in this embodiment, the first baffle 3203 and the second baffle 3204 are both arranged along the cross-section of the rotating shaft 310, forming a horizontal arrangement, which creates a tortuous flow path for the steam that first flows horizontally and then rises axially. This arrangement is more regular and the structure is simple; moreover, the flow path is long, which is beneficial to the settling effect.

[0107] In this embodiment, both the first baffle 3203 and the second baffle 3204 are annular baffles 3202 that vertically penetrate each vertical plate 3201 and are fixedly connected to each vertical plate 3201. The first baffle 3203 and the second baffle 3204 are integral annular baffles 3202, which have a simple structure and enhance the overall structural strength. In other embodiments, the first baffle 3203 and the second baffle 3204 can also be non-annular baffles. For example, in the multiple settlement channels 321 separated by the vertical plates 3201, the baffles in different settlement channels 321 are independent fan-shaped baffles, not integral annular baffles. The multi-layered baffles 3202 in different settlement channels 321 can also be arranged at different heights. For example, the baffles 3202 in the first settlement channel 321 and the baffles 3202 in the second settlement channel 321 are staggered in the height direction and are not at the same height. The multi-layer baffles 3202 within different settlement channels 321 can also be arranged in different alternating staggered configurations. For example, the multi-layer baffles 3202 in the first settlement channel 321 can be arranged in a horizontally alternating staggered configuration, while the multi-layer baffles 3202 in the second settlement channel 321 can be arranged in an inclined alternating staggered configuration. Furthermore, the number of baffles 3202 and the shape of each baffle 3202 can be adjusted accordingly based on the requirements of the settlement effect.

[0108] In other embodiments, the baffle 3202 can also be configured such that a plurality of first baffles 3203 surrounding the rotating shaft 310 are inclined to the vertical plate 3201; or a plurality of second baffles 3204 surrounding the rotating shaft 310 are inclined to the vertical plate 3201. Preferably, the plurality of first baffles 3203 and the plurality of second baffles 3204 can also be inclined to the vertical plate 3201 in the same direction, that is, the plurality of first baffles 3203 and the plurality of second baffles 3204 are inclined to the cross section of the rotating shaft 310 in the same direction, and the plurality of first baffles 3203 and the plurality of second baffles 3204 are arranged alternately and staggered along the axial direction of the rotating shaft 310. With this inclined arrangement, the surfaces of the two baffles 3202 form a spiral structure relative to the vertical plate 3201, rather than a completely horizontal surface. The two spiral structures are like the spiral blades of an electric fan, which makes it easier for the steam to come into contact with the baffles 3202 when the steam passes horizontally between the first baffle 3203 and the second baffle 3204, condensing the droplets 10 and forming vortices. This prolongs the residence time of the steam in the settling channel 321, thereby improving the settling effect.

[0109] like Figure 5 and Figure 6 As shown, in this embodiment, along the radial direction from the rotating shaft 310 to the inner wall of the cylinder 200, the first baffle 3203 includes a first body 32031 and a first bent portion 32032 connected in sequence, and the second baffle 3204 includes a second bent portion 32042 and a second body 32041 connected in sequence. The first body 32031 and the second body 32041 are arranged along the cross-section of the rotating shaft 310, that is, in a horizontal direction. The first bent portion 32032 is inclined downward, that is, inclined towards the bottom of the rotor 300; the second bent portion 32042 is inclined upward, that is, inclined towards the top of the rotor 300. With such an inclined arrangement, when steam passes through, the steam is blocked by the two bent portions, making it easier to collect the droplets 10; and the inclined arrangement forms a curved flow channel between the first baffle 3203 and the second baffle 3204, rather than a horizontally straight flow channel, which is beneficial to extending the flow path. With the inclined setting in the above direction, the droplets 10 easily gather on the inner wall of the cylinder 200, are scraped and flow downward on the inner wall of the cylinder 200, and are then evaporated again, so that the droplets 10 are effectively recycled.

[0110] like Figure 5 and Figure 6As shown, along the steam rising direction B, an annular collecting dish 3205 is provided at the initial end of the top support assembly 320 along the inner wall of the cylinder 200. The collecting dish 3205 is an open dish with an overall circular shape and an L-shaped cross-section, with its opening facing the inner wall and top of the cylinder 200. The radial outer edge of the second baffle 3204 at the initial end of the top support assembly 320 is located above the collecting dish 3205, allowing the droplets 10 collected on the second baffle 3204 to fall into the collecting dish 3205. The collecting dish 3205 concentrates the droplets 10 condensed on the surface of the baffle 3202, removing vaporous foam generated on the surface of the steam material. The collected droplets 10 flow down the inner wall of the cylinder 200 and are evaporated again. The collecting tray 3205 intercepts the liquid droplets 10 in the steam. The non-condensable steam rises and enters the downstream equipment of the evaporator, where gas-liquid separation occurs, preventing impure liquid droplets 10 from flowing into the downstream equipment and thus protecting it. The liquid droplets 10 collect and flow back to the evaporation section, achieving re-evaporation and circulation, continuously removing impurities from the liquid droplets 10, thereby improving the quality of the steam. In existing technologies using wire mesh demisters, liquid droplets 10 or impurities in the feed can easily clog the wire mesh, making it difficult to clean. Therefore, compared to existing technologies, this scraped film evaporator 100 uses a collecting tray 3205, which can also remove steam droplets, avoid impurity clogging, and is easy to clean.

[0111] like Figure 6 As shown, the collecting tray 3205 is connected to the vertical plate 3201. Along a direction opposite to the steam rising direction B, an annular distribution ring 3206 is connected below the collecting tray 3205. The distribution ring 3206 includes a ring body 3208 and a bent section 3207 extending obliquely towards the inner wall of the cylinder 200 and clearance-fitting the inner wall of the cylinder 200. The opening of the collecting tray 3205 is located above the bent section 3207, allowing droplets 10 to drip from the opening of the collecting tray 3205 onto the surface of the bent section 3207. The bent section 3207 is used to throw the droplets 10 onto the inner wall of the cylinder 200 when rotating with the rotating shaft 310. In this structure, the distribution ring 3206 and the collecting tray 3205 can rotate with the rotor 300. The annular distribution ring 3206 collects droplets 10 dripping from the collection tray 3205 and droplets 10 that collect on the inner wall of the cylinder 200 and then drip. As the distribution ring 3206 rotates with the rotor 300, the collected droplets 10 are thrown onto the inner wall of the cylinder 200, evenly distributed on the circumferential inner wall of the cylinder 200, which is beneficial to the uniformity of the droplet distribution and thus improves the quality after evaporation. The bent section 3207 is inclined towards the inner wall, which allows it to collect droplets 10 dripping from the collection tray 3205 and the inner wall of the cylinder 200; the bent section 3207 is clearance-fitted with the inner wall of the cylinder 200, so that the distribution ring 3206 will not scratch the inner wall when it is rotated.

[0112] like Figure 6As shown, in this embodiment, the bent section 3207 extends downward in order to better distribute the droplets 10. This is a preferred arrangement, allowing the droplets 10 to flow smoothly out of the bent section 3207. In other embodiments, the bent section 3207 can also extend horizontally, or even be slightly tilted upward when the rotor 300 is rotating at high speed.

[0113] like Figure 4 and Figure 7 As shown, the specific structure of the intermediate support assembly 330 is as follows: The intermediate support assembly 330 includes several intermediate support rings 3300 stacked axially. Each intermediate support ring 3300 is a ring-shaped structural component, which includes an outer ring 3301, an inner ring 3302, and a radial connecting rod 3303 connecting the outer ring 3301 and the inner ring 3302. The rotating shaft 310 passes through the inner ring 3302. At the same time, the rotor 300 also includes a tie rod 350 that passes through each outer ring 3301 and is connected to the top support assembly 320 and the bottom support assembly 340. The tie rod 350 and the rotating shaft 310 connect the multiple intermediate support rings 3300 in series at the outer ring 3301 and the inner ring 3302 of the intermediate support rings 3300, thereby forming a stable hollow structure, through which steam can rise. Each intermediate support ring 3300 has several scrapers 360 connected circumferentially at its outer ring 3301. When the rotor 300 rotates, each scraper 360 continuously scrapes the material flowing along the inner wall of the cylinder 200 into a thin film. This intermediate support ring 3300, with its hollow structure formed between the radial connecting rods 3303, reduces the overall weight. Especially for large-capacity rotor structures, this intermediate support ring 3300 structure reduces the resistance to rotor rotation, thus improving production efficiency. A rotating shaft 310 passes through the inner ring 3302, and a tie rod 350 passes through each outer ring 3301, connecting to the top support assembly 320 and the bottom support assembly 340. This strengthens the structural strength of the rotor 300 both internally and externally, improving its rigidity. Steam passes through the hollow structure and contacts each layer of intermediate support rings 3300, which helps to condense and settle the liquid droplets 10 entrained in the steam.

[0114] like Figure 2 and Figure 3As shown, multiple heating sections 210 are attached to the outer wall of the cylinder 200. Specifically, in this embodiment, the middle section of the cylinder 200 has three heating sections 210. Each heating section 210 includes a coil structure 220 spirally wound on the outer wall of the cylinder 200, and an externally input heat-conducting medium flows through the coil structure 220. The heating sections 210 on the outer wall of the cylinder 200 can heat the material inside the cylinder 200, evaporating low-boiling-point substances in the material. The multiple heating sections 210 can use the same or different heat-conducting media, and different heating sections 210 can produce the same or different heating temperatures to better adapt to the heating needs of different materials or to adapt to changes in the flow of the thin film on the inner wall of the cylinder 200, thereby improving evaporation efficiency and the quality of the steam product. The use of the coil structure 220 results in high heat transfer efficiency.

[0115] The ratio of the total length of the multiple heating sections 210 along the axial direction of the cylinder 200 to the diameter of the cylinder 200 is in the range of 3 to 7, so as to ensure that the heating sections 210 effectively heat the material and that the material is not insufficiently heated because the diameter of the cylinder 200 is too large and the total length of the heating sections 210 is too short.

[0116] like Figure 8 and Figure 9 As shown, the coil structure 220 in this embodiment adopts a double coil structure 220, including an inner coil 221 and an outer coil 222. One outer coil 222 is stacked between two adjacent inner coils 221 to eliminate the gap between the two adjacent inner coils 221. This double coil structure 220 increases the heat conduction area, improves the heat conduction efficiency, and avoids extending the length of the cylinder 200. Furthermore, due to the increased heat conduction area, the heat output is increased, allowing the thin film on the inner wall of the cylinder 200 to evaporate more fully, thereby improving the quality of the steam. Depending on the heating effect requirements, the inner coil 221 and outer coil 222 of different heating sections 210 can be filled with heat conduction media of the same or different temperatures. When the temperatures are different, the temperature can be a gradually changing temperature gradient. The heat conduction media flowing in the inner coil 221 and outer coil 222 of different heating sections 210 can be of the same material or different materials, both of which can achieve different temperature changes.

[0117] like Figure 1 and Figure 9As shown in this embodiment, each heating section 210 is provided with an input pipe 230 and an output pipe 240 for the inflow or outflow of heat-conducting medium. Each input pipe 230 includes an input main pipe 2301 and two input branch pipes 2302, which are respectively connected to the inner coil 221 and the outer coil 222. Each output pipe 240 includes an output main pipe 2401 and two output branch pipes 2402, which are respectively connected to the inner coil 221 and the outer coil 222. In this way, the inner coil 221 and the outer coil 222 are circulated with heat-conducting medium of the same material. The delivery efficiency can be improved by using an input main pipe 2301 and an output main pipe 2401.

[0118] In other embodiments, depending on the required heating effect, the heating section 210 may also adopt a heating structure different from the coil structure 220, or when the coil structure 220 is used, other coil structures 220 may also be used, for example, Figure 10 The heating section 210 shown adopts a half-tube 250 structure. The half-tubes 250 are not stacked with each other, but are spirally wound on the outer wall of the cylinder 200. Figure 11 The heating section 210 shown adopts a jacket 260 structure. The jacket 260 is attached to the outer wall of the cylinder 200. There are many small grid spaces inside the jacket 260, through which a heat-conducting medium flows. These heating structures can all achieve the heating function.

[0119] like Figure 1 and Figures 12-15As shown, the bottom end of the rotating shaft 310 is connected to a bearing 400 and a bearing sleeve 401 that mates with the bearing 400. The scraped film evaporator 100 also includes an external pipe 600 located outside the cylinder 200. The external pipe 600 is located near the bottom of the cylinder 200 and includes an input end 606 and an output end 607. The output end 607 is connected to the inner cavity of the bearing sleeve 401. The input end 606 is connected to a lubricating fluid supply source 500 near the bottom of the cylinder 200. The lubricating fluid supply source 500 is located higher than the bearing sleeve 401. In the prior art, a container is usually set at the top of the scraped film evaporator 100 to collect the evaporated and purified product gas. After cooling, a solution is formed, and part of the solution formed from the product gas is transported through a long supply pipeline to the bearing 400 at the bottom of the cylinder 200 as the lubricating fluid for the bearing 400; or an external additional lubricating fluid is used to lubricate the bearing 400. However, in this embodiment, the lubricant supply source 500 stores a lubricant different from the product gas evaporated by the scraped film evaporator 100, avoiding product waste and improving product yield; it also shortens the lubricant supply pipeline and reduces lubrication supply costs. Positioning the lubricant supply source 500 above the bearing sleeve 401 allows the lubricant to flow to the bearing sleeve 401 under its own weight, achieving self-lubrication without requiring an additional power source, further reducing equipment costs.

[0120] Specifically, Figure 12 and Figure 13 One form of the lubricant supply source 500 is shown. The lubricant supply source 500 includes a collection tray 510 located on the inner wall of the cylinder 200. Since the fluid materials to be separated and purified are usually viscous liquids, the concentrated liquid left after evaporation by the scraped film evaporator, or the droplets condensed on the inner wall of the cylinder 200 by the evaporated gas, have a certain lubricating effect. Therefore, the collection tray 510 can collect the liquid condensed on the inner wall of the cylinder 200 to serve as lubricant for the bearing sleeve 401. When the material processed by the scraped film evaporator 100 is a solvent with lubricating properties, and the bearing 400 does not have high requirements for lubricant, the solvent can be used as a lubricant. This method fully utilizes the liquid on the inner wall of the cylinder 200 as a lubricant, eliminating the need for additional lubricant and avoiding the consumption of product gas, thus avoiding waste of product gas and reducing lubrication costs.

[0121] Figure 14 and Figure 15 Another form of the lubricant supply source 500 is shown, which includes a lubricant storage container 520 disposed outside the cylinder 200. This lubricant storage container 520 can be a small-capacity lubricant bottle. Using this lubricant supply method, the lubricant storage container 520 can store dedicated lubricant, rather than product gas or droplets 10 on the inner wall of the cylinder 200, thus improving lubrication performance.

[0122] The two types of lubricant supply sources 500 mentioned above can be used individually or two different lubricant supply sources 500 can be configured simultaneously on the same equipment to flexibly select different types of lubricant supply sources 500 according to different working conditions.

[0123] like Figure 12 , Figure 14 and Figure 15 As shown, in this embodiment, the external pipe 600 is provided with a filter 601, a valve 602, and a sight glass 603 sequentially from the input end 606 to the output end 607. The filter 601 can filter impurities in the lubricating fluid, the valve 602 can regulate the flow rate of the lubricating fluid, and the inner cavity of the sight glass 603 is filled with the lubricating fluid transported through the external pipe 600. The sight glass 603 has a transparent observation window for observing the flow state of the lubricating fluid, so that the operator can take timely action to ensure good lubrication effect. Specifically, the inner cavity of the sight glass 603 is provided with an impeller 604, which is driven to rotate by the dripping lubricating fluid. The operator can more intuitively understand the flow state of the lubricating fluid by observing the rotation state of the impeller 604 (whether it is stationary or rotating at a certain speed). The sight glass 603 is also equipped with a sensor 605, which is electrically connected to the external control unit. The sensor 605 can monitor the rotation of the impeller 604 and transmit the rotation status signal to the external control unit, thereby monitoring the flow status of the lubricating fluid in real time. This allows the external control unit to take timely measures (such as alarm or flow regulation via valve 602) to ensure that the droplets 10 continue to fall and reduce the risk of operational failure.

[0124] like Figure 13 and Figure 15 As shown, the bearing sleeve 401 is connected to the cylinder 200 via several bearing support members 403. Among the bearing support members 403 is at least one bearing support tube 402 with a hollow inner hole. The output end 607 is connected to the inner cavity of the bearing sleeve 401 via the bearing support tube 402. The lubricant supply source 500 is positioned higher than the bearing support tube 402. The bearing sleeve 401 is fixedly connected to the cylinder 200 via the several bearing support members 403, improving the support strength. The bearing support member 403 uses a bearing support tube 402 with a hollow inner hole, enabling it to both support the bearing 400 and transfer lubricant from the external pipe 600 to the bearing sleeve 401, integrating two different functions. No additional lubricant delivery pipeline is needed within the cylinder 200, simplifying the lubricant delivery structure.

[0125] In this embodiment, there are multiple bearing support tubes 402, radially distributed around the circumference of the bearing sleeve 401. Each bearing support tube 402 is inclined, allowing the lubricant to flow to the bearing 400 by its own weight without auxiliary driving force, thus achieving self-lubrication. One or more external pipes 600 are connected to the bearing support tubes 402 at different positions along the circumference. This connection ensures that if one bearing support tube 402 is blocked, other tubes can still deliver lubricant, guaranteeing unobstructed flow. Furthermore, the lubricant supplies lubrication to the bearing 400 from different directions, improving lubrication uniformity and efficiency.

[0126] like Figure 1 and Figures 12-15 As shown, the scraped film evaporator 100 also includes a flange assembly 900 and a discharge cylinder 700 connected to the bottom of the cylinder 200. The flange assembly 900 includes an upper flange 901 and a lower flange 902. The upper flange 901 is clamped to the outer surface of the bottom of the cylinder 200, and the lower flange 902 is clamped to the outer surface of the top of the discharge cylinder 700. The external pipe 600 is connected to the flange assembly 900. Compared to the bearing 400 assembly being directly connected to the cylinder 200, the scraped film evaporator 100 enhances the connection strength between the cylinder 200 and the discharge cylinder 700 through the flange assembly 900, resulting in a more stable structure. Connecting the external pipe 600 to the flange assembly 900 utilizes the high strength of the flange assembly 900 to support the external pipe 600, ensuring structural stability. The flange assembly 900 adopts a split structure, facilitating removal from the cylinder 200 for replacement and maintenance of the bearing 400 assembly.

[0127] Figure 12 and Figure 13 The diagram illustrates the connection between the external pipe 600 and the flange assembly 900 when the collection tray 510 is used as the lubricant supply source 500. The input end 606 of the external pipe 600 is connected to the collection tray 510 through an input through-hole 6061 on the upper flange 901. An intermediate annular connector 903 is sandwiched and connected between the upper flange 901 and the lower flange 902. The output end 607 of the external pipe 600 is connected to the bearing support pipe 402 through an output through-hole 6071 on the annular connector 903. In this configuration, the collection tray 510 is connected to the input end 606 through the input through-hole 6061 of the upper flange 901. The structural strength of the upper flange 901 secures the input end 606 of the external pipe 600, ensuring good structural strength and stable output of the collected droplets 10 from the collection tray 510.

[0128] Figure 14 and Figure 15The diagram illustrates the connection method between the external pipe 600 and the flange assembly 900 when the lubricant storage container 520 outside the cylinder 200 is used as the lubricant supply source 500. The input end 606 of the external pipe 600 is connected to the lubricant storage container 520, and the output end 607 of the external pipe 600 is connected to the bearing support pipe 402 through the output through hole 6071 provided in the annular connector 903.

[0129] It should be noted that the flange assembly 900 can have different structural forms. In other embodiments, there may be no intermediate connecting piece between the upper flange 901 and the lower flange 902. Correspondingly, the output through hole 6071, which connects the output end 607 of the external pipe 600 to the bearing support pipe 402, can be located on the upper flange 901, the lower flange 902, or other structures between the upper flange 901 and the lower flange 902. When the liquid receiving tray 510 is used as the lubricating fluid supply source 500, the input through hole 6061, which connects the input end 606 of the external pipe 600 to the liquid receiving tray 510, can also be located at other positions in the cylinder 200.

[0130] like Figure 4 and Figure 13 As shown, in order to protect the rotating shaft 310, reduce the impact of bearing 400 wear on the lifespan of the rotating shaft 310, and facilitate the replacement and maintenance of the bearing 400, the rotating shaft 310 in this embodiment adopts a split structure design. It includes a main body portion 311 penetrating the cylinder 200 and a connecting portion 312 detachably connected to the bottom end of the main body portion 311. The connecting portion 312 includes a disc-shaped portion 3121 that mates with the bottom end face of the main body portion 311 and a mating portion 3122 that connects to the disc-shaped portion 3121. The bearing sleeve 401 is attached to the mating portion 3122. In other embodiments, the rotating shaft 310 may also adopt a one-piece structure, but the rotating shaft 310 in this embodiment adopts a detachably connected split structure, which can improve the service life of the rotating shaft 310 and facilitate replacement or other maintenance needs. When it is necessary to replace the connecting part 312 of the rotating shaft 310, replace the bearing 400, or check the lubrication status, the flange assembly 900 can be disassembled to separate the discharge cylinder 700 from the cylinder body 200. Then, the connecting part 312 of the rotating shaft 310 can be separated from the main body 311. This way, only the connecting part 312 needs to be replaced, instead of replacing the entire rotating shaft 310, saving costs and making maintenance more convenient. The outer diameter of the disc-shaped portion 3121 of the connecting part 312 is larger than the outer diameter of the mating portion 3122. This design allows the bearing 400 to be a smaller bearing 400, eliminating the need for a large bearing 400 and saving on bearing 400 costs and lubricant usage.

[0131] Example 2

[0132] This embodiment provides a gas-liquid separation method, which includes the following steps:

[0133] Provide 100 wiped film evaporators;

[0134] The material to be separated is fed into the cylinder 200 of the scraped film evaporator 100 and distributed to the inner wall of the cylinder 200; the material to be separated is, for example, a viscous substance such as waste solvent.

[0135] The rotor 300 of the scraped film evaporator 100 is driven to rotate, which drives the scraper 360 on the rotor 300 to cut the material to be separated on the inner wall of the cylinder 200, forming a thin film containing liquid mixture.

[0136] Heating the membrane to separate vapor and concentrated solvent from the membrane. The concentrated solvent is typically a high-viscosity, heavy-component solvent that can be a useful substance that can be reused or a residual waste.

[0137] The top space of the cylinder 200 is divided into multiple channels extending along the axial direction; specifically, the scraped film evaporator 100 used in this embodiment is the scraped film evaporator 100 as in Embodiment 1, and the top space is divided into eight channels extending along the axial direction by eight vertical plates 3201 as in Embodiment 1.

[0138] Each of the multiple channels is separated into a settling channel 321 by a staggered arrangement of multiple layers of baffles 3202; as described in Example 1, five layers of baffles 3202 are arranged in a staggered arrangement to separate the eight channels into eight settling channels 321.

[0139] Steam is heated, causing it to rise and pass through settling channels 321 and multiple baffles 3202 within each settling channel 321, causing the heavy liquid components in the steam to condense into droplets 10, yielding the remaining light component steam product. The light component steam product is typically a low-viscosity, light gaseous substance.

[0140] This gas-liquid separation method achieves material evaporation and separation through the above steps. In particular, by heating the steam and passing it through multiple settling channels 321 and multiple baffles 3202 in each settling channel 321, the steam flow rate is slowed down, allowing more heavy liquid components in the steam to be condensed into droplets 10, thereby improving the settling effect and the purity of the steam product.

[0141] Preferably, when the channel is divided into settling channels 321 by the multi-layer baffles 3202, the number of settling channels 321 satisfies the following condition: the ratio of the diameter of the cylinder 200 to the number of settling channels 321 is in the range of 0.16 to 0.3. Using this ratio range makes the number of settling channels 321 compatible with the diameter of the cylinder 200, which is beneficial to ensuring the settling effect and the quality of steam products.

[0142] More preferably, the number of settlement channels 321 is designed to be controlled within the range of 4 to 12, which can ensure a better settlement effect.

[0143] The gas-liquid separation method further includes controlling the total output Q of the steam product so that the steam product flow velocity V meets the following condition: V ranges from 3.2 to 5.1 m / s. Where V = Q / S, S = π × A × H, and S is the cross-sectional area of ​​the settling channel 321. Figure 5 As shown, A is the radial distance between two baffles 3202 on the same horizontal plane inside the cylinder 200, H is the axial distance between two adjacent baffles 3202, and π is the constant of pi. The total output of steam products is related to the feed rate of the material to be separated, the working pressure inside the cylinder 200, the heating temperature, and the rotational speed of the rotor 300. That is, adjusting the feed rate of the material to be separated, the working pressure inside the cylinder 200, the heating temperature, and the rotational speed of the rotor 300 can control the total output of steam products to meet the above conditions. This allows the steam to maintain its fluidity and be fully settled in the settling channel 321, removing the heavy liquid components from the steam and improving the purity of the steam products.

[0144] Specifically, the step of feeding the material to be separated into the cylinder 200 of the scraped film evaporator 100 includes feeding the material to be separated into the cylinder 200 at different positions along the circumference. This step can improve the distribution efficiency and uniformity of the material, as well as increase the feed rate, thereby improving the efficiency and flow rate of steam generation.

[0145] Furthermore, this gas-liquid separation method also includes controlling the rotational speed of the rotor 300 and the heating temperature of the cylinder 200, so that the thickness of the film is controlled within the range of 1mm to 3mm. For example, depending on the material and viscosity of different materials to be separated, the rotor 300 is controlled to rotate at a speed of 100-500 rpm and the heating temperature is controlled, so that the scraper 360 scrapes the material to be separated into a film with a thickness of 1mm-3mm. Through this step, the thickness of the film is ensured to be neither too thick nor too thin, so that the thickness of the film is controlled within the range that allows for rapid evaporation, which is beneficial to improving the quality of the steam. Moreover, compared with adjusting the distance between the scraper 360 and the inner wall of the cylinder 200 to adjust the film thickness, this method is easier to implement and simpler to operate.

[0146] Furthermore, the gas-liquid separation method also includes setting the heating temperature of the cylinder 200 to gradually increase or decrease along the flow direction of the thin film on the inner wall of the cylinder 200. For example, three heating sections 210 are attached to the outer wall of the cylinder 200, and each heating section 210 has a coil structure on its outer wall. The inlet of each coil is located at the lower position of the heating section, and the outlet of the coil is located at the higher position of the heating section. Along the flow direction of the film on the inner wall of the cylinder 200 (i.e., from top to bottom), in the first heating section 210 at the top, the heat-conducting medium enters from the coil inlet at a lower position with an inlet temperature of 180°C. The heat-conducting medium flows upward in the coil and exits from the coil outlet at a higher position with an outlet temperature of 160°C. Therefore, the temperature range of this first heating section 210 is 180°C-160°C. Similarly, the temperature range of the heat-conducting medium in the second heating section 210 is 200°C-180°C, and the temperature range of the heat-conducting medium in the third heating section 210 at the bottom is 220°C-200°C. The temperature range of the three heating sections 210 on the outer wall of the cylinder 200 gradually increases, forming a temperature gradient that gradually increases from top to bottom. Because the hot spot of the remaining concentrate after evaporation will rise after the film is heated, requiring more heat for effective separation, the heating method with a gradually increasing temperature gradient ensures that the film at every position in the flow direction can be rapidly evaporated and effectively separated. Of course, the temperature gradient can be gradually reduced for different materials to be separated. In other embodiments, the heating temperature of the cylinder can be kept constant along the flow direction. However, compared to keeping the temperature constant, this step uses a gradually changing temperature gradient, which can better adapt to the changes in heat requirements during the separation of different materials. It has wider adaptability and ensures that the film at every position in the flow direction can be rapidly evaporated and effectively separated, thereby improving evaporation efficiency and thus increasing the output of steam products.

[0147] In this embodiment, the scraped-film evaporator 100 used to implement the gas-liquid separation method is the scraped-film evaporator 100 as in Example 1, which is beneficial for improving the settling effect and thus improving the purity and quality of the steam. However, it should be noted that there are many types of scraped-film evaporators 100, and their specific structure and configuration can be adjusted as needed when applying the above-described gas-liquid separation method. Therefore, the gas-liquid separation method of this embodiment is not limited to the scraped-film evaporator 100 of Example 1, but can also be other types of scraped-film evaporators 100 capable of implementing the above-described method steps.

[0148] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A scraped film evaporator, comprising a cylindrical body (200) and a rotor (300) disposed within the cylindrical body (200), the rotor (300) including a rotating shaft (310) and a top support assembly (320) located at the top of the rotating shaft (310), characterized in that, The top support assembly (320) includes a plurality of vertical plates (3201) that are radially distributed from the rotating shaft (310) to the inner wall of the cylinder (200) and extend along the axial direction of the rotating shaft (310), and a multi-layer baffle (3202) disposed between the plurality of vertical plates (3201); the multi-layer baffle (3202) are arranged at intervals and staggered to form a flow path for steam to rise in a tortuous manner.

2. The scraped film evaporator as described in claim 1, characterized in that, The multi-layer baffle (3202) includes a first baffle (3203) located on one side of the rotating shaft (310) and a second baffle (3204) located on one side of the inner wall of the cylinder (200). The first baffle (3203) and the second baffle (3204) are both arranged along the cross-section of the rotating shaft (310) and are arranged alternately and staggered along the axial direction of the rotating shaft (310) to form a tortuous upward flow path for steam.

3. The scraped film evaporator as described in claim 2, characterized in that, The first baffle (3203) and the second baffle (3204) are both annular baffles that penetrate vertically through each of the vertical plates (3201) and are fixedly connected to each of the vertical plates (3201).

4. The scraped film evaporator as described in claim 2, characterized in that, Along the radial direction from the pivot (310) to the inner wall of the cylinder (200), the first baffle (3203) includes a first body (32031) and a first bent portion (32032) connected in sequence, and the second baffle (3204) includes a second bent portion (32042) and a second body (32041) connected in sequence. The first body (32031) and the second body (32041) are arranged along the cross-section, the first bent portion (32032) is inclined downward, and the second bent portion (32042) is inclined upward.

5. The scraped film evaporator as described in claim 1, characterized in that, The multi-layer baffle (3202) includes a first baffle (3203) located on one side of the rotating shaft (310) and a second baffle (3204) located on one side of the inner wall of the cylinder (200). The first baffle (3203) and the second baffle (3204) are both inclined in the same direction to the cross section of the rotating shaft (310) and are arranged alternately and staggered along the axial direction of the rotating shaft (310).

6. The scraped film evaporator as described in claim 2 or 5, characterized in that, Along the direction of steam rise, an annular collecting dish (3205) is provided at the initial end of the top support assembly (320) along the inner wall of the cylinder (200), and the opening of the collecting dish (3205) faces the inner wall of the cylinder (200); The radial outer edge of the second baffle (3204) at the initial end of the top support assembly (320) is positioned above the collection tray (3205) so that droplets (10) collected on the second baffle (3204) fall into the collection tray (3205).

7. The scraped film evaporator as described in claim 6, characterized in that, The collecting tray (3205) is connected to the vertical plate (3201); along the direction opposite to the rising direction of the steam, an annular distribution ring (3206) is connected below the collecting tray (3205). The distribution ring (3206) includes a bent section (3207) that extends obliquely toward the inner wall of the cylinder (200) and is in clearance fit with the inner wall of the cylinder (200). The opening of the collecting tray (3205) is located above the bent section (3207) so that the droplets (10) drip from the opening of the collecting tray (3205) onto the surface of the bent section (3207). The bent section (3207) is used to throw the droplets (10) onto the inner wall of the cylinder (200) when it rotates with the rotating shaft (310).

8. The scraped film evaporator as described in claim 7, characterized in that, The bending segment (3207) extends downward or horizontally.

9. The scraped film evaporator as described in claim 1, characterized in that, The rotor (300) also includes an intermediate support assembly (330) located in the middle section of the shaft (310) and a bottom support assembly (340) located at the bottom of the shaft (310). The intermediate support assembly (330) includes a plurality of intermediate support rings (3300) stacked along the axial direction. Each of the plurality of intermediate support rings (3300) includes an outer ring (3301), an inner ring (3302), and a radial connecting rod (3303) connecting the outer ring (3301) and the inner ring (3302). The rotating shaft (310) passes through the inner ring (3302). The rotor (300) also includes a tie rod (350) that runs through each of the outer rings (3301) and is connected to the top support assembly (320) and the bottom support assembly (340).

10. The scraped film evaporator as claimed in claim 1, characterized in that, Multiple heating sections (210) are attached to the outer wall of the cylinder (200). Each of the multiple heating sections (210) includes a coil structure (220) spirally wound on the outer wall of the cylinder (200). An externally input heat-conducting medium flows through the coil structure (220).

11. The scraped-film evaporator as described in claim 10, characterized in that, The ratio of the total length of the plurality of heating sections (210) along the axial direction of the cylinder (200) to the diameter of the cylinder (200) is in the range of 3 to 7.

12. The scraped film evaporator as described in claim 10, characterized in that, The coil structure (220) includes an inner coil (221) and an outer coil (222), and is configured such that one coil of the outer coil (222) is stacked between two adjacent coils of the inner coil (221) to eliminate the gap between two adjacent coils of the inner coil (221); The inner coil (221) and outer coil (222) of the different heating sections (210) are filled with heat-conducting media of the same or different temperatures.

13. The scraped film evaporator as described in claim 1, characterized in that, The bottom end of the rotating shaft (310) is connected to a bearing (400) and a bearing sleeve (401) that cooperates with the bearing (400). The scraped film evaporator also includes an external pipe (600) located outside the cylinder (200). The external pipe (600) includes an input end (606) and an output end (607). The output end (607) is connected to the inner cavity of the bearing sleeve (401). The input end (606) is connected to a lubricating fluid supply source (500) near the bottom of the cylinder (200). The lubricating fluid supply source (500) is located higher than the bearing sleeve (401). The lubricating fluid supply source (500) stores a lubricating fluid that is different from the product gas evaporated by the scraped film evaporator.

14. The scraped film evaporator as described in claim 13, characterized in that, The lubricant supply source (500) includes a liquid collection tray (510) provided on the inner wall of the cylinder (200), the liquid collection tray (510) is used to collect the liquid on the inner wall of the cylinder (200) as the lubricant for the bearing sleeve (401); And / or, the lubricant supply source (500) includes a lubricant storage container (520) disposed outside the cylinder (200).

15. The scraped-film evaporator as described in claim 13, characterized in that, The bearing sleeve (401) is connected to the cylinder (200) through a plurality of bearing supports (403); At least one of the bearing supports (403) is a bearing support tube (402) with a hollow inner hole, and the output end (607) is connected to the inner cavity of the bearing sleeve (401) through the bearing support tube (402); the position of the lubricant supply source (500) is higher than the position of the bearing support tube (402).

16. The scraped film evaporator as described in claim 15, characterized in that, The number of bearing support tubes (402) is multiple, and they are radially distributed in the circumferential direction of the bearing sleeve (401). One or more of the external pipes (600) are respectively connected to the bearing support tubes (402) at different positions in the circumferential direction.

17. The scraped-film evaporator as described in claim 15, characterized in that, The scraped film evaporator also includes a flange assembly (900) and a discharge cylinder (700) connected to the bottom of the cylinder (200). The flange assembly (900) includes an upper flange (901) and a lower flange (902). The upper flange (901) is clamped on the bottom outer surface of the cylinder (200), and the lower flange (902) is clamped on the top outer surface of the discharge cylinder (700). The output end (607) is connected to the bearing support tube (402) through an output through hole (6071) provided on the upper flange (901), an output through hole (6071) provided on the lower flange (902), or an output through hole (6071) provided between the upper flange (901) and the lower flange (902).

18. The scraped film evaporator as described in claim 17, characterized in that, The lubricant supply source (500) includes a liquid collection tray (510) provided on the inner wall of the cylinder (200), the liquid collection tray (510) is used to collect the liquid on the inner wall of the cylinder (200) as the lubricant for the bearing sleeve (401); The input end (606) is connected to the liquid receiving tray (510) through the input through hole (6061) provided on the upper flange (901), and the output through hole (6071) is provided on the lower flange (902) or between the upper flange (901) and the lower flange (902).

19. A gas-liquid separation method, comprising the following steps: Provide scraped film evaporators; The material to be separated is fed into the cylinder (200) of the scraped film evaporator and distributed to the inner wall of the cylinder (200); The rotor (300) of the scraped film evaporator is driven to rotate, which drives the scraper (360) on the rotor (300) to cut the material to be separated on the inner wall of the cylinder (200) to form a thin film containing liquid mixture; The film is heated to separate vapor and concentrated solvent from the film; The top space of the cylinder (200) is divided into a plurality of channels extending along the axial direction of the cylinder (200); Each of the multiple channels is separated into a settling channel (321) by staggered arrangement of multiple baffles (3202). The steam is heated so that it rises and passes through the settling channel (321) and the multi-layer baffle (3202) in each of the settling channels (321) to cause the heavy component liquid in the steam to condense into droplets (10) to obtain the remaining light component steam product in the steam.

20. The gas-liquid separation method as described in claim 19, characterized in that, The ratio of the diameter of the cylinder (200) to the number of the settling channels (321) is in the range of 0.16 to 0.

3.

21. The gas-liquid separation method as described in claim 20, characterized in that, The number of the settling channels (321) ranges from 4 to 12.

22. The gas-liquid separation method as described in claim 19, characterized in that, The gas-liquid separation method further includes: controlling the total output Q of the steam product so that the flow rate V of the steam product meets the following condition: V is in the range of 3.2~5.1 m / s; Wherein, V=Q / S, S=π×A×H, S is the cross-sectional area of ​​the settling channel (321), A is the radial distance between the two baffles (3202) on the same horizontal plane inside the cylinder (200), H is the axial distance between two adjacent baffles (3202), and π is the constant of pi. The total output of the steam product is related to the feed amount of the material to be separated, the working pressure inside the cylinder (200), the heating temperature, and the rotational speed of the rotor (300).

23. The gas-liquid separation method as described in claim 19, characterized in that, The step of feeding the material to be separated into the cylinder (200) of the scraped film evaporator includes: The material to be separated is fed into the cylinder (200) at different positions along the circumference.

24. The gas-liquid separation method as described in claim 19, characterized in that, The gas-liquid separation method further includes: The rotational speed of the rotor (300) and the heating temperature of the cylinder (200) are controlled so that the thickness of the film is controlled within the range of 1 mm to 3 mm.

25. The gas-liquid separation method as described in claim 19, characterized in that, The gas-liquid separation method further includes: The heating temperature of the cylinder (200) is set to gradually increase or decrease along the flow direction of the film on the inner wall of the cylinder (200).

26. The gas-liquid separation method as described in claim 19, characterized in that, The scraped film evaporator is the scraped film evaporator as described in any one of claims 1-18.

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