Horizontal scraper evaporator

Abstract

The invention relates to a horizontal scraper evaporator which comprises a shell and end plates arranged on the two sides of the shell. The device further comprises a core module arranged in the shell, the core module comprises a core frame and a driving shaft, the driving shaft is rotationally arranged on the core frame, the relative position of the driving shaft and the core frame is kept unchanged, the two ends of the core module are arranged on the end plates, and the two ends of the core module are connected with the end plates. And the two ends of the core body module are flexibly and fixedly connected and sealed with the end plates. Through the arrangement of the modular core body, the fit clearance between the scraper and the heat exchange plate can be accurately controlled, and meanwhile, the device has the beneficial effects of being high in operation stability and convenient and fast to install and maintain.

Description

Technical Field

[0001] This invention relates to the field of evaporation and concentration, and specifically to a horizontal scraped evaporator. Background Technology

[0002] In the field of evaporation and concentration in industrial production, the treatment of high-salt, high-viscosity, and easily scale-forming liquids has always been a technical challenge. These liquids have complex compositions, high mineralization, and often contain large amounts of calcium and magnesium ions, suspended particles, and viscous substances. During evaporation, they readily form a fouling layer on the heat exchange surfaces. When using traditional evaporation equipment, such as shell-and-tube evaporators and falling film evaporators, to treat high-salt, high-viscosity, and easily scale-forming liquids, the evaporators are prone to scaling and clogging. Therefore, scraped-plate evaporators with mechanical descaling capabilities have gradually become the core equipment for treating such complex liquids.

[0003] Traditional scraper evaporators mostly adopt a vertical structure, such as Chinese utility model patent 2019209347735. Their core design involves a central shaft driving a scraper to rotate within the vertical cylinder, scraping the material into a thin liquid film for evaporation. However, this vertical structure has several technical drawbacks: 1) Limited heat exchange area: The diameter and height of the vertical heating cylinder are constrained by mechanical strength and the rotational stability of the scraper, making it impossible to simply expand the heat transfer area. The heat transfer area of ​​a typical single unit generally does not exceed 50㎡, which is insufficient to meet the processing capacity requirements of large-scale industrial production; 2) Strict film distribution requirements: The material must be evenly sprayed onto the vertical heating wall through a top distributor. Fluctuations in the feed rate or blockage of the distributor can easily lead to excessively thick or thin liquid films, or even dry walls, reducing evaporation efficiency and potentially causing decomposition or coking of heat-sensitive materials; 3) Severe solid deposition at the bottom: In a vertical structure, the liquid settles naturally, and solids such as salts tend to accumulate in the bottom hopper, making discharge difficult and severely impacting production continuity.

[0004] To address the aforementioned problems of vertical scraped plate evaporators, the industry has gradually developed horizontal scraped plate evaporation / crystallization equipment, as exemplified by patents / patent applications CN201510444140.2, CN200920210579.9, CN201910766712.7, and CN111803981A. This type of evaporator utilizes multiple parallel heat exchange plates within a horizontal shell, with rotating scrapers positioned between the plates. The scrapers are fixed to a central shaft, and bearing seats are mounted on end plates on both sides of the shell. Engineering practice has shown that this type of horizontal scraped plate evaporator exhibits the following key technical defects during production and use: 1) The clearance between the heat exchange plate and the scraper is difficult to control, leading to mechanical scraping problems during equipment operation: In existing technology, the scraper of the horizontal scraper evaporator is fixed to the drive shaft, which is fixed to the shell end plate, while the heat exchange plates are fixed to the core frame, forming two completely independent fixing systems: "drive shaft-shell end plate" and "heat exchange plate-core frame". Due to machining errors and cumulative installation errors, the relative positions of the two systems are difficult to coordinate precisely, resulting in an unstable control of the clearance between the scraper and the heat exchange plate. In actual installation, problems often occur where the clearance is too large (incomplete scale removal, scale deposition) or too small (interference and scraping between the scraper and the plate during operation). In some cases, after the shell end plate is installed, it may be found that the internal scraper has made a hard collision with the heat exchange plate, requiring disassembly and reinstallation, which seriously affects the equipment assembly efficiency and operational safety.

[0005] 2) Problem of uncontrolled clearance due to thermal deformation: In the existing technology, the horizontal scraper evaporator does not consider the impact of thermal deformation during equipment operation and lacks effective measures to absorb thermal deformation. Because the traditional structure uses two independent fixing systems and the heat exchange plate and pipeline are rigidly connected, the thermal deformation of the heat exchange core and drive shaft cannot be matched in a coordinated manner. Due to the difference in the thermal expansion coefficient of the materials, the drive shaft, heat exchange plate, shell and core frame will produce different degrees of expansion and contraction deformation after the temperature rises. When thermal deformation occurs, the relative position of the scraper and the heat exchange plate will shift uncontrollably, resulting in changes in the clearance between the scraper and the heat exchange plate, and even the scraper rubbing against the heat exchange plate, which seriously affects the safe and stable operation of the evaporator.

[0006] In summary, both vertical and horizontal scraped evaporators in the existing technology have certain technical defects in terms of gap control, heat deformation absorption, and operational stability, and cannot fully meet the needs of efficient and stable evaporation treatment of various complex liquids in the industrial field. Summary of the Invention

[0007] The present invention aims to provide a horizontal scraped evaporator to overcome the shortcomings of the prior art. The technical problem to be solved by the present invention is achieved through the following technical solution.

[0008] A horizontal scraped evaporator includes a shell and end plates disposed on both sides of the shell; the improvement is that it further includes a core module disposed within the shell, the core module including a core frame and a drive shaft, the drive shaft being rotatably disposed on the core frame and maintaining a constant relative position with the core frame, the two ends of the core module being disposed on the end plates, and the two ends of the core module being flexibly fixedly connected and sealed to the end plates.

[0009] Preferably, the core end frame of the core frame is provided with a bearing bracket base, and a bearing sealing assembly is fixedly installed in the bearing bracket base. The drive shaft passes through the bearing sealing assembly and is rotatably mounted on the core frame through the bearing sealing assembly, maintaining a constant relative position with the core frame.

[0010] Preferably, one end of the drive shaft passes through the bearing sealing assembly and then extends out of the housing, and is connected to the motor via a coupling.

[0011] Preferably, the end plate is provided with a core fixing flange, and the bearing bracket base on the core end frame of the core frame passes through the core fixing flange. The space between the bearing bracket base and the core fixing flange is filled with end plate sealing filler. The core fixing flange and the end plate sealing cap cooperate to fix and seal the bearing bracket base and the end plate, thereby realizing a flexible fixed connection and sealing between the core module and the end plate.

[0012] Preferably, a core support rail is provided inside the housing along the length of the housing, and the core support rail is adapted to the core frame to support the core module.

[0013] Preferably, the upper part of the shell is provided with a steam inlet and a steam inlet sleeve is provided at the steam inlet. The external steam inlet pipe passes through the steam inlet sleeve and is connected to the main steam inlet pipe. The space between the steam inlet sleeve and the external steam inlet pipe is filled with steam inlet pipe sealing packing. The steam inlet sleeve and the steam inlet pipe sealing cap are fixedly connected, and the steam inlet pipe sealing packing is pressed by the steam inlet pipe sealing cap to achieve a flexible fixed connection and seal between the steam inlet sleeve and the external steam inlet pipe.

[0014] Preferably, the steam inlet manifold is located above the core frame, and the steam inlet manifold is used to divert the high-temperature steam introduced through the external steam inlet pipe to each heat exchange plate.

[0015] Preferably, the lower part of the housing is provided with a condensate outlet and a condensate sleeve is provided at the condensate outlet. The external condensate pipe passes through the condensate sleeve and is connected to the condensate main pipe. The space between the condensate sleeve and the external condensate pipe is filled with condensate pipe sealing packing. The condensate sleeve and the condensate pipe sealing cap are fixedly connected, and the condensate pipe sealing cap presses the condensate pipe sealing packing to achieve a flexible fixed connection and seal between the condensate sleeve and the external condensate pipe.

[0016] Preferably, the condensate manifold is located below the core frame, and the condensate manifold is used to collect the condensate formed by the steam condensation in each heat exchange plate into the external condensate pipe.

[0017] Preferably, the core frame includes two mutually symmetrical core side frames and two mutually symmetrical core end frames, and the two core end frames are provided with bearing bracket bases.

[0018] Compared with the prior art, the present invention has at least the following beneficial technical effects: (1) Modular core design with precise and controllable gap: The modular core design integrates the drive shaft and the core frame into one unit, forming an independent modular component. The drive shaft is rotated on the core frame and the drive shaft and the core frame are relatively fixed, which changes the two independent fixing systems of "drive shaft-shell" and "heat exchange plate-core frame" in the prior art. This allows the relative position of the scraper on the drive shaft and the heat exchange plate on the core frame to be precisely adjusted and locked with the core frame as a unified reference. This eliminates the gap misalignment problem caused by processing error and cumulative installation error from the root, and makes the gap between the scraper and the heat exchange plate stably controlled within the optimal range. This effectively avoids interference and scraping between the scraper and the heat exchange plate during operation, effectively improves the safety and stability of equipment operation, and also effectively reduces the difficulty of on-site assembly and the cost of reassembly and debugging.

[0019] (2) Flexible sealing to absorb errors and deformation: The drive shaft is mounted on the core frame, making them integrated into a single module to replace the two separate fixing systems in the prior art. When the core frame and drive shaft deform due to heat, their different deformations are controlled by the integrated structure, thus reducing the impact on the adjusted gap between the scraper and the heat exchange plate. The deformation caused by the heat deformation of the drive shaft is absorbed by the end plate sealing gland and end plate sealing packing. The steam pipe sealing gland and steam inlet pipe sealing packing, condensate pipe sealing gland and condensate pipe sealing packing are used to absorb the offset between the external steam inlet pipe and the steam inlet sleeve, and between the external condensate pipe and the condensate sleeve caused by the thermal deformation of the core frame. The flexible sealing assembly composed of the end plate sealing gland and end plate sealing packing, the steam inlet pipe sealing gland and steam inlet pipe sealing packing, and the condensate pipe sealing gland and condensate pipe sealing packing can also effectively compensate for processing errors and cumulative installation errors during installation, thereby improving the convenience of equipment installation and enhancing the stability of equipment operation.

[0020] (3) Convenient installation and maintenance, and reduced cost: The core module and horizontal scraper evaporator of the present invention can be prefabricated, gap adjusted and performance tested in the factory. On the production site, the core module is hoisted and pushed into the shell for fixation by the core support rail, which simplifies the assembly process and shortens the installation cycle. During the later maintenance, the core module can be pulled out for inspection and repair without disassembling the shell and pipeline system, which reduces the maintenance difficulty. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the end plate structure in this invention; Figure 4 This is a schematic diagram of the core module in this invention; Figure 5 This is an exploded structural diagram of the core frame in this invention; Figure 6 This is a schematic diagram of the connection structure between the core module and the end plate in this invention; Figure 7 This is a schematic diagram of the steam inlet structure in this invention; Figure 8 This is a schematic diagram of the exploded structure of the present invention; Figure 9 This is a schematic diagram of another embodiment of the present invention; The reference numerals in the attached figures are as follows: 1. Shell, 2. Scraper, 3. Heat exchange plate, 4. Core frame, 41. Core side frame, 42. Core end frame, 43. Bearing bracket base, 5. Steam inlet main pipe, 6. Steam inlet, 61. Steam inlet pipe sealing packing, 62. Steam inlet sleeve, 63. Steam inlet pipe sealing gland, 7. End plate, 71. Core fixing flange, 8. Drive shaft, 9. Bearing sealing assembly, 10. Motor, 11. Core support rail, 12. Condensate main pipe, 13. Condensate outlet, 131. Condensate pipe sealing gland, 132. Condensate pipe sealing packing, 133. Condensate sleeve, 14. End plate sealing gland, 15. End plate sealing packing, 16. Discharge port, 17. Secondary steam outlet, 18. Base, 19. Feed port. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1: Reference Figures 1 to 8As shown, a horizontal scraped evaporator includes a shell 1 and end plates 7 disposed on both sides of the shell 1; the improvement is that it also includes a core module disposed inside the shell 1, the core module including a core frame 4 and a drive shaft 8, the drive shaft 8 being rotatably disposed on the core frame 4 and maintaining a constant relative position with the core frame 4, the two ends of the core module being disposed on the end plates 7, and the two ends of the core module being flexibly fixedly connected and sealed with the end plates.

[0024] In this embodiment, by rotating the drive shaft 8 onto the core frame 4 while keeping the relative position of the drive shaft 8 and the core frame 4 unchanged, that is, by rotating the drive shaft 8 onto the core frame 4 and keeping the two relatively fixed, the core frame 4 and the drive shaft 8 are integrated into one unit, forming an independent modular component. This changes the two independent fixing systems of "drive shaft-housing" and "heat exchange plate-core frame" in the prior art into a single fixing system of "drive shaft-core frame".

[0025] In this embodiment, the relative positions of the multiple scrapers 2 on the drive shaft 8 and the multiple heat exchange plates 3 on the core frame 4 are precisely adjusted and locked using the core frame 4 as a unified reference. This eliminates the gap misalignment problem caused by machining errors and cumulative installation errors at the source, ensuring that the fit gap between the scrapers 2 and the heat exchange plates 3 is stably controlled within the optimal range. This effectively avoids interference and scraping between the scrapers 2 and the heat exchange plates 3 during operation, effectively improving the safety and stability of equipment operation. At the same time, it can also effectively reduce the difficulty of on-site assembly and reduce the cost of reassembly and debugging.

[0026] In this embodiment, the drive shaft 8 is mounted on the core frame 4, making the two integrated into one unit to form an independent modular component, replacing the two separate fixing systems in the prior art. When the core frame 4 and the drive shaft 8 deform due to heat, their different deformations are coordinated by the limitation of their integrated structure, thereby reducing the impact on the already adjusted gap between the scraper and the heat exchange plate.

[0027] The core module and horizontal scraper evaporator of this embodiment can be prefabricated, gap adjusted and performance tested in the factory. On the production site, the core module is hoisted and pushed into the shell 1 for fixation by the core support rail 11, which simplifies the assembly process and shortens the installation cycle. During later maintenance, the core module can be pulled out for inspection and repair without disassembling the shell and piping system, which reduces the difficulty of maintenance.

[0028] Furthermore, refer to Figure 5As shown, the core frame 4 includes two mutually symmetrical core side frames 41 and two mutually symmetrical core end frames 42, and the two core end frames 42 are provided with bearing bracket bases 43.

[0029] The core side frame 41 is used to support, position and install the heat exchange plate 3. The core end frame 42 is used to fix the two core side frames 41. A bearing bracket base 43 is provided at the center of the core end frame 42. The core side frames 41 and the core end frame 42 are fixed together by bolts to form a core frame structure.

[0030] Furthermore, the core frame 4 is made of 100-type square steel welded together, including two core side frames 41 with a length of 5800mm and a height of 2000mm and two core end frames 42 with a length of 2600mm and a height of 1900mm. The core side frames 41 and the core end frames 42 are connected by M20 bolts.

[0031] Furthermore, the shell 1 is a horizontal cylindrical structure made of carbon steel-titanium composite plate. The base material is carbon steel with a thickness of 10mm, and the inner lining titanium plate has a thickness of 2mm. The shell 1 has a diameter of 3000mm, a length of 6000mm, and PN16 standard flanges at both ends. A discharge port 16 is provided at the middle of the bottom of the shell 1.

[0032] Furthermore, refer to Figure 1 , 2 As shown, the bottom of the housing 1 is provided with two sets of bases 18, the height of the bases 18 is 300mm, and the horizontal error of the entire horizontal evaporator is ensured to be ≤0.2mm / m.

[0033] Furthermore, the core frame 4 has multiple equidistant or non-equidistant embedding slots on its core side frame 41. The width of the embedding slots is adapted to the thickness of the heat exchange plates 3. The multiple heat exchange plates 3 are fixedly mounted on the core frame 4 through the multiple embedding slots at equal or non-equidistant intervals. Even further, the core side frame 41 has equidistant 60mm wide embedding slots to ensure that the parallelism error of the heat exchange plates 3 is ≤0.1mm / m; the bearing bracket base 43 is welded at the center of the two core end frames 42, with a hole coaxiality error ≤0.5mm.

[0034] In this embodiment, by setting multiple equally spaced embedding slots on the core side frame 41 and making the width of the embedding slots match the thickness of the heat exchange plate 3, the positioning and fixing of the multiple heat exchange plates 3 on the core frame 4 are realized, thereby ensuring the parallelism and spacing consistency of the multiple heat exchange plates 3.

[0035] Furthermore, refer to Figure 4 , 5As shown, a bearing bracket base 43 is provided on the core end frame 42 of the core frame 4. A bearing sealing assembly 9 is fixedly installed in the bearing bracket base 43. The drive shaft 8 passes through the bearing sealing assembly 9 and is rotatably mounted on the core frame 4 through the bearing sealing assembly 9, maintaining a constant relative position with the core frame 4.

[0036] Furthermore, the drive shaft 8 is made of 2205 duplex steel, with a shaft diameter of 250mm and a length of 6800mm. The shaft surface is heat-treated to a hardness of HRC28~32 and nitrided to a thickness of 0.3~0.5mm.

[0037] Furthermore, the bearing sealing assembly 9 includes a cylindrical roller bearing for supporting the drive shaft 8 and providing rotational support for the drive shaft 8, and a combined seal consisting of an O-ring and a labyrinth seal. In this embodiment, the bearing sealing assembly 9 seals the drive shaft 8 and the bearing housing base 43, and the core fixing flange on the end plate 7, in conjunction with the end plate sealing packing 15 and the end plate sealing gland 14, seals the bearing housing base 43 and the end plate 7, thereby completing the sealing at both ends of the drive shaft 8.

[0038] Furthermore, the cylindrical roller bearing is model NU336E with a rated dynamic load of 1800kN.

[0039] Furthermore, refer to Figure 1 , 3 As shown in Figure 6, the end plate 7 is provided with a core fixing flange 71. The bearing bracket base 43 on the core end frame 42 of the core frame 4 passes through the core fixing flange 71. The bearing bracket base 43 and the core fixing flange 71 are filled with end plate sealing filler 15. The core fixing flange 71 and the end plate sealing cover 14 cooperate to fix and seal the bearing bracket base 43 and the end plate 7, thereby realizing the flexible fixed connection and sealing between the core module and the end plate 7.

[0040] Furthermore, one end of the drive shaft 8 passes through the bearing sealing assembly 9 and extends out of the housing 1, and is connected to the motor 10 via a coupling. Even further, the motor 10 is a 75kW variable frequency motor equipped with a PLC variable frequency control system, and the speed of the motor 10 can be steplessly adjusted within the range of 0~60rpm.

[0041] Furthermore, the end plate 7 includes a left end plate and a right end plate, both made of 20mm thick 316L carbon steel-titanium composite plate with a titanium plate layer thickness of 2mm; the end plate 7 has a hole in the center for mounting the bearing bracket base 43 and a DN600 core fixing flange 71 welded thereon; the end plate 7 is connected to the housing 1 by flanges and M24 high-strength bolts, and PTFE gaskets are installed between the flange faces for sealing.

[0042] Furthermore, the end plate sealing packing 15 can be made of carbon fiber impregnated PTFE packing, flexible graphite packing, aramid fiber packing or asbestos packing, with a cross-sectional size of 15×15mm; the end plate sealing gland 14 is a carbon steel forging, which is connected to the core fixing flange 71 by M20 bolts, thereby tightening the packing and ensuring uniform pressure on the sealing surface, with a tightening torque of 45N·m.

[0043] Furthermore, refer to Figure 1 , 2 As shown, a core support rail 11 is provided inside the housing 1 along the length direction of the housing 1. The core support rail 11 is adapted to the core frame 4 to support the core module.

[0044] Furthermore, the core support rail 11 consists of two 100mm angle steels welded along the length of the housing 1. The spacing between the two angle steels is adapted to the core frame 4 to support the weight of the core module.

[0045] In this embodiment, the core support rail 11 serves two purposes: firstly, it bears the weight of the core module, such as the core frame 4 and the drive shaft 8; secondly, by bearing the weight of the core module, it prevents the weight of the core frame 4, heat exchange plate 3, drive shaft 8, etc., from affecting the drive shaft 8, bearing sealing assembly 9, bearing bracket base 43, and core fixing flange 71, thereby ensuring the levelness of the drive shaft 8 and the coaxiality of related components, thus protecting the drive shaft 8; thirdly, the core support rail 11 can serve as a track, providing guidance and sliding support during the assembly of the core module and the housing 1, thereby facilitating the assembly, disassembly, and maintenance of the equipment.

[0046] During assembly, the core module is pushed into the housing 1 along the core support rail 11, and the core side frame 41 of the core module is positioned and fixed to the core support rail 11 with bolts. The bearing bracket base 43 and the bearing sealing assembly 9 on both sides of the core module pass through the core fixing flange 71 of the end plate 7. The bearing bracket base 43 and the core fixing flange 71 are filled with end plate sealing filler 15, and then the end plate sealing filler 15 is pressed and compacted by the end plate sealing cover 14. Finally, the end plate sealing cover 14 and the core fixing flange 71 are fixed with bolts, thereby realizing the flexible fixed connection and sealing between the core module and the end plate 7.

[0047] Furthermore, refer to Figure 1 , 7 As shown in Figure 8, the upper part of the shell 1 is provided with a steam inlet 6 and a steam inlet sleeve 62 is provided at the steam inlet 6. The external steam inlet pipe passes through the steam inlet sleeve 62 and is connected to the steam inlet main pipe 5. The steam inlet sleeve 62 and the external steam inlet pipe are filled with steam inlet pipe sealing filler 61. The steam inlet sleeve 62 is fixedly connected to the steam inlet pipe sealing cap 63 and the steam inlet pipe sealing filler 61 is pressed by the steam inlet pipe sealing cap 63 to achieve flexible fixed connection and sealing between the steam inlet sleeve 62 and the external steam inlet pipe.

[0048] Furthermore, the main steam inlet pipe 5 is fixedly connected to the external steam inlet pipe via a flange, and the steam inlet sleeve 62 is fixedly connected to the steam inlet pipe sealing cap 63 via a flange.

[0049] Furthermore, the steam inlet sleeve 62 has dimensions of Φ315×8mm and is welded to the steam inlet 6.

[0050] Furthermore, the steam inlet manifold 5 is located above the core frame 4, and the steam inlet manifold is used to divert the high-temperature steam introduced through the external steam inlet pipe to each heat exchange plate 3.

[0051] In this embodiment, the steam inlet pipe sealing packing 61 and the steam inlet pipe sealing gland 63 achieve flexible fixed connection and sealing between the steam inlet sleeve 62 and the external steam inlet pipe, thereby achieving flexible fixed connection and sealing between the steam inlet main pipe 5 and the system steam inlet pipeline, and subsequently achieving flexible fixed connection and sealing between the core module and the system steam inlet pipeline.

[0052] Furthermore, refer to Figure 1 , 8As shown, the lower part of the housing 1 is provided with a condensate outlet 13 and a condensate sleeve 133 is provided at the condensate outlet 13. The external condensate pipe passes through the condensate sleeve 133 and is connected to the condensate main pipe 12. The space between the condensate sleeve 133 and the external condensate pipe is filled with condensate pipe sealing filler 132. The condensate sleeve 133 is fixedly connected to the condensate pipe sealing cap 131 and the condensate pipe sealing filler 132 is pressed by the condensate pipe sealing cap 131 to achieve a flexible fixed connection and seal between the condensate sleeve 133 and the external condensate pipe.

[0053] Furthermore, the condensate main pipe 12 is fixedly connected to the external condensate pipe through a flange, and the condensate sleeve 133 is fixedly connected to the condensate pipe sealing cap 131 through a flange.

[0054] Furthermore, the condensate sleeve 133 has dimensions of Φ100×6mm and is welded to the condensate outlet 13.

[0055] Furthermore, the condensate manifold 12 is located below the core frame, and the condensate manifold 12 is used to collect the condensate formed by the steam condensation in each heat exchange plate 3 into the external condensate pipe.

[0056] Furthermore, the steam inlet pipe sealing packing 61 and the condensate pipe sealing packing 132 can both be made of carbon fiber impregnated PTFE packing, flexible graphite packing, aramid fiber packing or asbestos packing, with a cross-sectional dimension of 15×15mm; the steam inlet pipe sealing gland 63 and the condensate pipe sealing gland 131 are both carbon steel forgings, which are connected to the steam inlet sleeve 62 and the condensate sleeve 133 respectively by M12 bolts, thereby ensuring uniform sealing surface clamping force and a clamping torque of 30N·m.

[0057] Furthermore, the steam inlet manifold 5 is made of DN200 titanium tubing, and the condensate manifold 12 is made of DN50 titanium tubing.

[0058] In this embodiment, the condensate pipe sealing packing 132 and the condensate pipe sealing cap 131 achieve flexible fixed connection and sealing between the condensate sleeve 133 and the external condensate pipe, thereby achieving flexible fixed connection and sealing between the condensate main pipe 12 and the system condensate pipeline, and subsequently achieving flexible fixed connection and sealing between the core module and the system condensate pipeline.

[0059] In this embodiment, the end plate sealing cap 14, the end plate sealing packing 15, the steam inlet pipe sealing cap 63, the steam inlet pipe sealing packing 61, the condensate pipe sealing cap 131, and the condensate pipe sealing packing 132 all constitute a flexible sealing assembly. On the one hand, it realizes flexible fixed connection and sealing, and on the other hand, it can compensate for the processing error, cumulative installation error and thermal deformation of the equipment components, especially the various errors and deformations between the core frame 4 and the drive shaft 8, thereby ensuring that the gap between the scraper 2 and the heat exchange plate 3 is within a stable and reasonable range.

[0060] The operational results of this embodiment are as follows: The treated substance is landfill leachate, with a feed COD of 8000~12000 mg / L, a salt content of 5%~8%, and a viscosity of 50~100 mPa·s at 25℃; the feed rate is 12 m³ / h, and the liquid level submerges the heat exchange plate; the heating steam temperature is approximately 105℃, the liquid evaporation temperature is 95℃, and the motor speed is 35 rpm; the measured evaporation rate is 10~11 m³ / h, the evaporation rate per unit area is 35 kg / (m²·h), the concentration factor can reach 8~10 times, and the concentrated liquid COD is 64000~120000 mg / L. After the evaporator has been running continuously for three months, disassembly and inspection showed that the clearance between the scraper and the heat exchange plate remained at the factory condition, with no interference or scratch marks.

[0061] The horizontal scraped evaporator of this embodiment effectively solves the technical defects of existing evaporators, such as difficulty in gap control, thermal deformation, and poor operational stability, through modular core design and flexible sealing and plugging scheme. It exhibits significant advantages of high efficiency, stability, and low consumption in the treatment of complex liquids with high salt and high viscosity, and can be widely used in deep concentration processes in fields such as landfill leachate, MVR mother liquor, and high-salt chemical wastewater.

[0062] Comparative example: The feed liquid treated by the comparative evaporator is the same as that in Example 1, which is a landfill leachate with a feed COD of 8000~12000 mg / L, a salt content of 5%~8%, and a viscosity of 50~100 mPa·s at 25°C.

[0063] This comparative example uses a conventional horizontal scraped evaporator with 1200mm×1200mm square heat exchange plates. This comparative example has a non-modular core structure, that is, the heat exchange plates of the evaporator are fixed on the core frame, the scraper is fixed on the drive shaft, and the drive shaft is fixed on the end plate of the shell.

[0064] The installation, manufacturing, and actual operating performance of the evaporator were compared with those of Example 1. The specific results are shown in the table below: Table 1. Operational results of the comparative example and Example 1

[0065] Example 2: Reference Figure 9 As shown, the difference between this embodiment and embodiment 1 is that the shell 1 in this embodiment adopts an elliptical cylindrical structure with a height of 4000mm and a length of 6000mm, and the outer wall of the shell 1 is provided with circumferential reinforcing ribs.

[0066] Compared with Example 1, this example has a larger gas phase separation space, and is therefore suitable for applications that are prone to foaming and have relatively high requirements for secondary steam condensate discharge indicators.

[0067] It should be noted that the above detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0070] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0071] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0072] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A horizontal scraped-surface evaporator comprising a housing (1), end plates (7) arranged on both sides of the housing (1); characterized in that: Also include the core module in the shell (1), the core module includes the core frame (4), the drive shaft (8), the drive shaft (8) rotation is provided on the core frame (4) and keeps the relative position of the core frame (4) unchanged, both ends of the core module are provided on the end plate (7), and the both ends of the core module are fixedly connected and sealed between the end plate (7).

2. A horizontal scraped surface evaporator according to claim 1, characterized in that: The core end frame (42) of the core frame (4) is provided with a bearing frame base (43), the bearing seal assembly (9) is fixedly installed in the bearing frame base (43), and the drive shaft (8) is provided in the bearing seal assembly (9) and is rotatably provided on the core frame (4) through the bearing seal assembly (9) and keeps the relative position of the core frame (4) unchanged.

3. A horizontal scraped surface evaporator according to claim 2, characterized in that: One end of the drive shaft (8) is provided in the bearing seal assembly (9) and extends out of the shell (1) and is connected with the motor (10) through the shaft coupling.

4. A horizontal scraped surface evaporator as claimed in claim 1, wherein: The end plate (7) is provided with a core fixing flange (71), the bearing frame base (43) on the core end frame (42) of the core frame (4) is provided in the core fixing flange (71), the bearing frame base (43) and the core fixing flange (71) are filled with the end plate sealing packing (15), and the core fixing flange (71) is matched with the end plate sealing gland (14) to fix and seal the bearing frame base (43) and the end plate (7), so that the flexible fixed connection and sealing between the core module and the end plate (7) are realized.

5. A horizontal scraped surface evaporator as claimed in claim 1, wherein: The core support rail (11) is matched with the core frame (4) to bear the core module.

6. A horizontal scraped surface evaporator as claimed in claim 1, wherein: The shell (1) is provided with a steam inlet (6) at the upper portion, and a steam inlet sleeve (62) is arranged at the steam inlet (6), an external steam inlet pipe is connected with the steam inlet manifold (5) through the steam inlet sleeve (62), the steam inlet sleeve (62) and the external steam inlet pipe are filled with steam inlet pipe sealing packing (61), the steam inlet sleeve (62) is fixedly connected with the steam inlet pipe sealing gland (63) and is pressed tightly by the steam inlet pipe sealing packing (61) through the steam inlet pipe sealing gland (63), so that the flexible fixed connection and sealing between the steam inlet sleeve (62) and the external steam inlet pipe are realized.

7. A horizontal scraped surface evaporator according to claim 6, characterized in that: The steam inlet manifold (5) is located above the core frame (4), and the steam inlet manifold (5) is used for distributing high-temperature steam introduced through the external steam inlet pipe into each heat exchange plate (3).

8. A horizontal scraped surface evaporator as claimed in claim 1, wherein: The lower part of the shell (1) is provided with a condensate outlet (13) and a condensate sleeve (133) at the condensate outlet (13), an external condensate pipe is connected with a condensate main pipe (12) after passing through the condensate sleeve (133), the condensate sleeve (133) and the external condensate pipe are filled with a condensate pipe sealing filler (132), the condensate sleeve (133) is fixedly connected with a condensate pipe sealing gland (131) and the condensate pipe sealing filler (132) is compressed by the condensate pipe sealing gland (131) to achieve flexible fixed connection and sealing between the condensate sleeve (133) and the external condensate pipe.

9. A horizontal scraped surface evaporator according to claim 8, characterized in that: The condensate main pipe (12) is located below the core frame (4) and is used for converging the condensate in each heat exchange plate (3) into an external condensate pipe.

10. A horizontal scraped surface evaporator as claimed in claim 1, characterized in that: The core frame (4) comprises two mutually symmetrical core side frames (41) and two mutually symmetrical core end frames (42), and the two core end frames (42) are provided with bearing frame bases (43).

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