Modular horizontal evaporator

Abstract

The present application relates to a kind of modular horizontal evaporator, including shell, end plate being arranged in the two sides of shell and being arranged in the upper portion of shell feed inlet, steam inlet and being arranged in the lower portion of shell discharge port, condensate outlet;It also includes the core module being arranged in shell, core module includes core frame, drive shaft, multiple scrapers and multiple heat exchange plates, multiple heat exchange plates equidistantly fixed on core frame, multiple scrapers equidistantly fixed on drive shaft and are driven by drive shaft rotation, multiple scrapers are evenly distributed between multiple heat exchange plates;Drive shaft is rotationally arranged on core frame and keeps the relative position of core frame unchanged, and core module is fixed on end plate.The present application can realize the accurate control of the cooperation gap of scraper and heat exchange plate by the modular core setting, can realize the effect of anti-deposition, smooth discharge by the setting of double-blade scraper, and the present application also has the advantages of high heat exchange efficiency, convenient installation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of evaporation and concentration, and specifically to a modular horizontal 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:

[0005] 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.

[0006] 2) Low coverage of heat exchange plates by the scraper, resulting in uneven descaling: In existing equipment structures, scrapers are mostly fixedly mounted on the rotating shaft / drive shaft. Due to limitations in the connection of the heat exchange plates, some edge areas and corners of the heat exchange plates are difficult to be effectively covered by the scraper, forming cleaning blind spots. These blind spots become the main areas for scale deposition. As the operating time increases, the scale gradually thickens, leading to a significant decrease in local heat transfer efficiency, which in turn affects the overall evaporation effect of the equipment.

[0007] 3) Problem of material accumulation in the bottom silo and difficulty in discharge: Existing horizontal scraper evaporators suffer from severe material accumulation in the bottom silo, which easily clogs the discharge channel. This problem is particularly prominent in the treatment of liquids with high salt content, high viscosity, and a large amount of solids. The scraper length is only suitable for the surface range of the heat exchange plates and cannot extend to the salt deposition area at the bottom of the shell. This results in a scraper disturbance blind zone at the bottom of the shell, where solids in the liquid tend to deposit. The scraper disturbance cannot effectively disperse the solids accumulated at the bottom, causing the material to gradually compact and harden, eventually clogging the discharge port and seriously affecting the continuity of production.

[0008] 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

[0009] The present invention aims to provide a modular horizontal 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.

[0010] A modular horizontal evaporator includes a shell, end plates on both sides of the shell, a feed inlet and a steam inlet on the upper part of the shell, and a discharge outlet and a condensate outlet on the lower part of the shell. The improvement lies in that it further includes a core module disposed within the shell. The core module includes a core frame, a drive shaft, multiple scrapers, and multiple heat exchange plates. The multiple heat exchange plates are equidistantly fixed on the core frame, and the multiple scrapers are equidistantly fixed on the drive shaft and driven to rotate by the drive shaft. The multiple scrapers are evenly distributed among the multiple heat exchange plates. The drive shaft is rotatably mounted on the core frame and maintains a constant relative position to the core frame. The core module is fixedly mounted on the end plates.

[0011] 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.

[0012] Preferably, the end plate is provided with a core fixing flange, the bearing bracket base passes through the core fixing flange, and 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 the fixation and sealing between the core module and the end plate.

[0013] 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.

[0014] Preferably, a steam inlet sleeve is provided on the shell at the steam inlet. An external steam inlet pipe passes through the steam inlet sleeve and is connected to the main steam inlet pipe located above the core frame. Steam inlet sleeve and external steam inlet pipe are filled with steam inlet pipe sealing packing. The steam inlet sleeve and 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 flexible fixed connection and sealing between the steam inlet sleeve and external steam inlet pipe.

[0015] Preferably, a condensate sleeve is provided on the housing at the condensate outlet. An external condensate pipe passes through the condensate sleeve and is connected to the condensate main pipe located below the core frame. A condensate pipe sealing filler is filled between the condensate sleeve and the external condensate pipe. The condensate sleeve is fixedly connected to the condensate pipe sealing cap, and the condensate pipe sealing filler is pressed by the condensate pipe sealing cap to achieve a flexible fixed connection and seal between the condensate sleeve and the external condensate pipe.

[0016] Preferably, the scraper includes at least one single-sided blade body, which is divided into an upper blade body and a lower blade body. The upper blade body is the portion of the single-sided blade body near the drive shaft, and the lower blade body is the portion of the single-sided blade body away from the drive shaft. The width and length of the upper blade body are adapted to the spacing between adjacent heat exchange plates and the radius of the inscribed circle of the heat exchange plate, respectively. The length of the single-sided blade body does not exceed half the length of the heat exchange plate.

[0017] Preferably, the upper section of the blade has a straight blade shape, and the lower section of the blade has a slanted blade shape.

[0018] Preferably, the plurality of scrapers are installed symmetrically with respect to the radial cross-section at the axial center point of the drive shaft.

[0019] Preferably, the heat exchange plate has a steam inlet branch pipe at the top and a condensate branch pipe at the bottom, and a heat exchange shaft hole for the drive shaft to pass through at the center of the heat exchange plate.

[0020] Preferably, the heat exchange plate has a honeycomb bulging hollow plate structure.

[0021] Preferably, the core module further includes a steam inlet manifold, which is located above the core frame and is connected to the steam inlet branch pipes of the plurality of heat exchange plates.

[0022] Preferably, the core module further includes a condensate main pipe, which is located below the core frame and is connected to the condensate branch pipes of the plurality of heat exchange plates.

[0023] Preferably, a secondary steam outlet is provided at the top of the shell.

[0024] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0025] (1) Modular core design with precise and controllable fit clearance: The modular core design integrates the scraper, heat exchange plate, drive shaft and core frame into an independent modular component. The drive shaft is rotatably mounted 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-housing" and "heat exchange plate-core frame" in the prior art. Thus, the relative position of the scraper and the heat exchange plate is 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, so that the fit clearance between the scraper and the heat exchange plate is 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.

[0026] (2) Double-blade scraper, anti-deposition and smooth discharge: The upper section of the flat blade and the lower section of the oblique blade form a single-side blade of the double-blade scraper. The width of the upper blade is adapted to the spacing between the adjacent heat exchange plates, thereby realizing efficient circumferential agitation of the liquid between the heat exchange plates, promoting heat transfer between the liquid and the heat exchange plates, and thus improving the heat transfer coefficient and evaporation efficiency. The end face of the lower blade is inclined and extends as far as possible to the bottom area of ​​the shell. Driven by the drive shaft, the liquid at the bottom of the shell is axially agitated and the axial agitation is used to disperse the solids deposited at the bottom of the shell. At the same time, the lower blades on both sides of the discharge port push the sediment on both sides of the bottom of the shell to the discharge port for smooth discharge. This solves the problems of easy deposition, compaction and caking of solids and easy blockage of discharge channels in the treatment of high-salt and high-viscosity liquids, thereby ensuring the continuous and stable operation of the equipment without frequent shutdown for cleaning.

[0027] (3) The scraper is adapted to the heat exchange plate, and the coverage is without dead corners: The heat exchange plate adopts a rectangular honeycomb bulging hollow plate structure and is matched with the scraper adapted to the length of the heat exchange plate. The rotation diameter of the lower section of the scraper is equal to the length of the heat exchange plate. Combined with the circumferential equal angle setting of multiple single-sided scrapers and the staggered installation of adjacent scrapers, it can achieve a complete coverage cleaning of the surface of the heat exchange plate, thereby eliminating the cleaning blind spots at the edges, corners and the connection between the core frame and the heat exchange plate in the prior art, avoiding the local heat transfer efficiency decay caused by the deposition of scale in the blind spots, and thus ensuring the stable and efficient overall heat exchange performance of the heat exchange plate.

[0028] (4) Improved heat exchange efficiency and adaptability to complex solution treatment: The rectangular heat exchange plates are arranged in parallel and equidistant manner. Combined with the stirring of the scraper, the contact area and renewal rate between the liquid and the heat exchange plates can be effectively increased. The evaporation rate per unit area can reach 20~50 kg / m², and the heat transfer efficiency is significantly improved. At the same time, there is no need to pre-treat high-salt, high-viscosity, and easily scaled liquids with calcium and magnesium removal. It can be directly adapted to the deep concentration of various complex liquids such as landfill leachate and MVR mother liquor, thereby reducing the cost and operating expenses of supporting pretreatment equipment and making it more widely applicable.

[0029] (5) Convenient installation and maintenance, and reduced cost: The core module and horizontal 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 into the shell and fixed 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

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a side view of the structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the end plate structure in this invention;

[0033] Figure 4 This is a schematic diagram of the core module in this invention;

[0034] Figure 5 This is an exploded structural diagram of the core frame in this invention;

[0035] Figure 6 This is a schematic diagram of the heat exchange plate in this invention;

[0036] Figure 7 This is a schematic diagram of the scraper structure in this invention;

[0037] Figure 8 This is a schematic diagram of the connection structure between the core module and the end plate in this invention;

[0038] Figure 9 This is a schematic diagram of the steam inlet structure in this invention;

[0039] Figure 10 This is a schematic diagram of the exploded structure of the present invention;

[0040] Figure 11 This is a schematic diagram of another embodiment of the present invention;

[0041] The reference numerals in the attached drawings are as follows: 1. Shell; 2. Scraper; 201. Upper scraper body; 202. Lower scraper body; 3. Heat exchange plate; 31. Condensate branch pipe; 32. Steam inlet branch pipe; 33. Heat exchange shaft hole; 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 pressure. 7. Cover, 8. End plate, 9. Core fixing flange, 10. Drive shaft, 11. Bearing sealing assembly, 12. Motor, 13. Core support rail, 14. Condensate main pipe, 15. Condensate outlet, 16. Condensate pipe sealing gland, 17. Condensate pipe sealing packing, 18. Condensate sleeve, 19. End plate sealing gland, 10. End plate sealing packing, 10. Discharge port, 11. Secondary steam outlet, 12. Base, 13. Inlet. Detailed Implementation

[0042] 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.

[0043] Example 1:

[0044] Reference Figures 1 to 10 As shown, a modular horizontal evaporator includes a shell 1, end plates 7 on both sides of the shell 1, a feed inlet 19 and a steam inlet 6 on the upper part of the shell 1, and a discharge port 16 and a condensate outlet 13 on the lower part of the shell 1. The improvement lies in that it further includes a core module disposed within the shell 1. The core module includes a core frame 4, a drive shaft 8, multiple scrapers 2, and multiple heat exchange plates 3. The multiple heat exchange plates 3 are equidistantly fixed on the core frame 4, and the multiple scrapers 2 are equidistantly fixed on the drive shaft 8 and driven to rotate by the drive shaft 8. The multiple scrapers 2 are evenly distributed among the multiple heat exchange plates 3. The drive shaft 8 is rotatably mounted on the core frame 4 and maintains a constant relative position with the core frame 4. The core module is fixedly mounted on the end plates 7.

[0045] 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 scraper 2, heat exchange plate 3, core frame 4 and drive shaft 8 are integrated into a 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".

[0046] In this embodiment, the relative positions of the scraper 2 and the heat exchange plate 3 are precisely adjusted and locked using the core frame 4 as a unified reference. This eliminates the gap misalignment problem caused by processing errors and cumulative installation errors from the root, ensuring that the fit gap between the scraper 2 and the heat exchange plate 3 is stably controlled within the optimal range. This effectively avoids interference and scraping between the scraper 2 and the heat exchange plate 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.

[0047] The core module and horizontal 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.

[0048] Furthermore, refer to Figure 5 As 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.

[0049] 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.

[0050] 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.

[0051] 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. The discharge port 16 is located at the bottom center of the shell 1.

[0052] Furthermore, refer to Figure 1 , Figure 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.

[0053] Furthermore, the core frame 4 has multiple equally spaced embedding slots on its core side frame 41. The width of the embedding slots is adapted to the thickness of the heat exchange plate 3. The multiple heat exchange plates 3 are fixedly mounted on the core frame 4 at equal intervals through the multiple embedding slots.

[0054] Furthermore, the core side frame 41 is provided with 60mm equidistant and 4mm wide embedded grooves to ensure that the parallelism error of the heat exchange plate 3 is ≤0.1mm / m; the bearing bracket base 43 is welded at the center of the two core end frames 42, and the coaxiality error of the hole is ≤0.5mm.

[0055] 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.

[0056] Furthermore, refer to Figure 4 , Figure 5 As 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.

[0057] 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.

[0058] 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.

[0059] Furthermore, the cylindrical roller bearing is model NU336E with a rated dynamic load of 1800kN.

[0060] Furthermore, refer to Figure 1 , Figure 3 , Figure 8As shown, the end plate 7 is provided with a core fixing flange 71, and the bearing bracket base 43 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 fixation and sealing between the core module and the end plate 7.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] Furthermore, refer to Figure 1 , Figure 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.

[0065] 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.

[0066] 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, heat exchange plate 3, and 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, and drive shaft 8 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.

[0067] 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.

[0068] Furthermore, refer to Figure 1 , Figure 9 , Figure 10 As shown, a steam inlet sleeve 62 is provided on the shell 1 at the steam inlet 6. An external steam inlet pipe passes through the steam inlet sleeve 62 and is connected to the main steam inlet pipe 5 located above the core frame 4. A steam inlet pipe sealing filler 61 is filled between the steam inlet sleeve 62 and the external steam inlet pipe. 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 a flexible fixed connection and seal between the steam inlet sleeve 62 and the external steam inlet pipe.

[0069] 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.

[0070] Furthermore, the steam inlet sleeve 62 has dimensions of Φ315×8mm and is welded to the steam inlet 6.

[0071] 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.

[0072] Furthermore, refer to Figure 1 , Figure 10 As shown, a condensate sleeve 133 is provided on the housing 1 at the condensate outlet 13. An external condensate pipe passes through the condensate sleeve 133 and is connected to the condensate main pipe 12 located below the core frame 4. A condensate pipe sealing filler 132 is filled between the condensate sleeve 133 and the external condensate pipe. 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.

[0073] 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.

[0074] Furthermore, the condensate sleeve 133 has dimensions of Φ100×6mm and is welded to the condensate outlet 13.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] Furthermore, refer to Figure 7 As shown, the scraper 2 includes at least one single-sided blade body, which is divided into an upper blade body 201 and a lower blade body 202. The upper blade body 201 is the part of the single-sided blade body close to the drive shaft 8, and the lower blade body 202 is the part of the single-sided blade body away from the drive shaft 8. The width and length of the upper blade body 201 are adapted to the spacing between adjacent heat exchange plates 3 and the radius of the inscribed circle of the heat exchange plate 3, respectively. The length of the single-sided blade body does not exceed half the length of the heat exchange plate 3.

[0079] Furthermore, the number of single-sided blades can be one, i.e., the scraper 2 is a single-blade scraper; the number of single-sided blades can also be two, i.e., the scraper 2 is a two-blade straight scraper; the number of single-sided blades can also be three, and the three single-sided blades are arranged in a fan shape with an included angle of 120°, i.e., the scraper 2 is a three-blade fan-shaped scraper; of course, the number of single-sided blades can also be set according to actual needs.

[0080] Furthermore, the length of the single-sided blade is half the length of the heat exchange plate 3 to ensure that the scraper 2 covers the heat exchange plate to the maximum extent and has no blind spots.

[0081] Furthermore, the upper section of the blade 201 has a straight blade shape, and the lower section of the blade 202 has a slanted blade shape.

[0082] Furthermore, the length ratio of the upper section cutter body 201 to the lower section cutter body 202 is 2:1 to 5:1, and the axial inclination angle of the end face of the lower section cutter body 202 is 10° to 45°.

[0083] Furthermore, the single-sided blade body is made of duplex steel 2205. The upper blade body 201 has a length of 600mm and a width of 40mm, the lower blade body 202 has a length of 200mm, a width of 40mm, and an axial tilt angle of 30° on the end face. The scraper 2 is fixedly installed at equal intervals through the positioning holes on the drive shaft 8.

[0084] Furthermore, the plurality of scrapers 2 are symmetrically installed with respect to the radial cross-section at the axial center point of the drive shaft 8.

[0085] In this embodiment, the upper section 201 of the single-sided blade of the scraper 2 is used to circumferentially agitate the liquid between the heat exchange plates 3, and the lower section 202 of the single-sided blade of the scraper 2 is used to agitate the liquid at the bottom of the shell 1 to push the liquid, especially the sediment, to the discharge port 16 located in the middle of the shell 1, thereby reducing the deposition of solids at the bottom of the shell 1 and thus realizing the function of scraper 2 in assisting discharge.

[0086] In this embodiment, a double-blade single-sided blade is used, consisting of a straight upper blade 201 and an oblique lower blade 202. The width of the upper blade 201 is adapted to the spacing between adjacent heat exchange plates 3, thereby achieving efficient circumferential agitation of the liquid between the heat exchange plates 3. This promotes heat transfer between the liquid and the heat exchange plates 3, thereby improving the heat transfer coefficient and evaporation efficiency. The lower blade 202 has an inclined end face that extends as far as possible to the bottom area of ​​the shell 1. Driven by the drive shaft 8, it rotates to agitate the liquid at the bottom of the shell 1 and disperses the solids deposited at the bottom of the shell 1. At the same time, the lower blades 202 on both sides of the discharge port 16 push the sediment on both sides of the bottom of the shell 1 toward the discharge port 16. This solves the problems of easy deposition, compaction, and blockage of the discharge channel in the treatment of high-salt and high-viscosity liquids, thus ensuring the continuous and stable operation of the equipment without frequent shutdowns for cleaning.

[0087] In this embodiment, by setting the longest length of one side of the scraper 2 to half the length of the heat exchange plate 3, the length of the one side of the scraper 2 is adapted to the length of the heat exchange plate 3. When the drive shaft 8 drives the scraper 2 to rotate, the end rotation diameter of the one side of the scraper is adapted to the length of the heat exchange plate 3. Combined with the circumferential equal angle setting of multiple one side of the scrapers and the staggered installation of adjacent scrapers 2, it is possible to achieve comprehensive cleaning of the surface of the heat exchange plate 3, thereby eliminating the cleaning blind spots at the edges, corners and the connection between the core frame and the heat exchange plate in the prior art, avoiding the local heat transfer efficiency attenuation caused by scale deposition in the blind spots, and thus ensuring the stable and efficient overall heat exchange performance of the heat exchange plate 3.

[0088] Furthermore, refer to Figure 6 As shown, the heat exchange plate 3 has a steam inlet branch pipe 32 at the top and a condensate branch pipe 31 at the bottom. The heat exchange plate 3 has a heat exchange shaft hole 33 at the center for the drive shaft 8 to pass through.

[0089] Furthermore, the nominal diameter of the steam inlet branch pipe 32 is 45 mm, and the nominal diameter of the condensate branch pipe 31 is 25 mm.

[0090] Furthermore, the heat exchange plate 3 has a honeycomb bulging hollow plate structure.

[0091] Furthermore, the heat exchange plate 3 is rectangular, made of 1.5mm thick titanium material, with a length of 2400mm and a height of 1200mm. The thickness of the heat exchange plate 3 after expansion is 10mm, and the diameter of the heat exchange shaft hole 33 is 300mm.

[0092] In this embodiment, the rectangular heat exchange plates are arranged in parallel and equidistant positions. Combined with the agitation of the scraper, this effectively increases the contact area and renewal rate between the liquid and the heat exchange plates. The evaporation rate per unit area can reach 20-50 kg / m², significantly improving the heat transfer efficiency. Furthermore, it eliminates the need for pre-treatment to remove calcium and magnesium from high-salt, high-viscosity, and easily scaling liquids. It can be directly adapted for the deep concentration of various complex liquids such as landfill leachate and MVR mother liquor, thereby reducing the cost and operating expenses of the supporting pretreatment equipment and broadening its applicability.

[0093] Furthermore, refer to Figure 4 As shown, the core module also includes a steam inlet main pipe 5 and a condensate main pipe 12. The steam inlet main pipe 5 is located above the core frame 4 and is connected to the steam inlet branch pipes 32 of the multiple heat exchange plates 3. The condensate main pipe 12 is located below the core frame 4 and is connected to the condensate branch pipes 31 of the multiple heat exchange plates 3.

[0094] Furthermore, the steam inlet main pipe 5 is made of DN200 titanium pipe and is welded to the steam inlet branch pipe 32 of the heat exchange plate 3; the condensate main pipe 12 is made of DN50 titanium pipe and is welded to the condensate branch pipe 31 of the heat exchange plate 3.

[0095] In this embodiment, multiple scrapers 2 and heat exchange plates 3 are alternately and equidistantly arranged in the core frame 4. The multiple scrapers 2 rotate with the drive shaft 8. The bearing sealing assembly 9 fixes both ends of the drive shaft 8 to the bearing bracket base 43 on the core end frame 42, thereby enabling the drive shaft 8 to rotate on the core frame 4 and maintain a fixed relative position with the core frame 4. The steam inlet main pipe 5 is connected to the steam inlet branch pipes 32 of each heat exchange plate 3, and the condensate main pipe 12 is connected to each heat exchange plate. The condensate branch pipe 31 of 3 is connected, thereby realizing the transformation from two independent fixing systems of "drive shaft-shell end plate" and "heat exchange plate-core frame" into one independent fixing system of "drive shaft-core frame". That is, the core frame 4, drive shaft 8, scraper 2 and heat exchange plate 3, as well as steam inlet main pipe 5 and condensate main pipe 12 are integrated into one unit. In other words, the core frame 4, drive shaft 8, scraper 2 and heat exchange plate 3, as well as steam inlet main pipe 5 and condensate main pipe 12 are integrated into an independent module, an independent core module applied to the evaporator.

[0096] Furthermore, refer to Figure 1 As shown, a secondary steam outlet 17 is provided at the top of the shell 1.

[0097] 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. The lower section of the cutter body creates a strong axial agitation of the liquid material in the bottom chamber of the shell. The solid content in the bottom chamber of the shell is in the range of 20% to 30%, with no compaction or caking. The discharge port is unobstructed, and no blockage problem occurred during operation.

[0098] The modular horizontal evaporator of this embodiment effectively solves the technical defects of existing evaporators, such as difficulty in gap control, blind spots in coverage, and easy sedimentation in the bottom chamber, through modular core design, optimized scraper structure and flexible sealing scheme. It shows significant advantages of high efficiency, stability and low consumption in the treatment of complex liquids with high salt and high viscosity. It can be widely used in the deep concentration process of landfill leachate, MVR mother liquor, chemical high salt wastewater and other fields.

[0099] Comparative example:

[0100] 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.

[0101] This comparative example uses a conventional horizontal scraped evaporator with 1200mm×1200mm square heat exchange plates and two-blade straight scrapers with a blade rotation diameter of 1000mm, meaning that the scraper partially covers the heat exchange plate when rotating. This comparative example has a non-modular core structure, meaning that the evaporator's heat exchange plates are fixed to the core frame, the scraper is fixed to the drive shaft, and the drive shaft is fixed to the end plate of the shell.

[0102] 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:

[0103] Table 1. Operational results of the comparative example and Example 1

[0104]

[0105] Example 2:

[0106] Reference Figure 11 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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 modular horizontal evaporator, comprising a shell (1), end plates (7) disposed on both sides of the shell (1), a feed inlet (19) and a steam inlet (6) disposed on the upper part of the shell (1), and a discharge outlet (16) and a condensate outlet (13) disposed on the lower part of the shell (1); characterized in that: It also includes a core module disposed within the housing (1). The core module includes a core frame (4), a drive shaft (8), multiple scrapers (2), and multiple heat exchange plates (3). The multiple heat exchange plates (3) are equidistantly fixed on the core frame (4). The multiple scrapers (2) are equidistantly fixed on the drive shaft (8) and are driven to rotate by the drive shaft (8). The multiple scrapers (2) are evenly distributed among the multiple heat exchange plates (3). The drive shaft (8) is rotatably disposed on the core frame (4) and maintains a constant relative position with the core frame (4). The core module is fixed on the end plate (7). A bearing bracket base (43) is provided on the core end frame (42) of the core frame (4). 3) A bearing sealing assembly (9) is fixedly installed in the core. 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) and maintains a constant relative position with the core frame (4). The end plate (7) is provided with a core fixing flange (71). The bearing bracket base (43) 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) cooperates with the end plate sealing cover (14) to fix and seal the bearing bracket base (43) and the end plate (7), thereby realizing the fixation and sealing between the core module and the end plate (7). The scraper (2) includes at least one single-sided blade body, which is divided into an upper blade body (201) and a lower blade body (202). The upper blade body (201) is the part of the single-sided blade body close to the drive shaft (8), and the lower blade body (202) is the part of the single-sided blade body away from the drive shaft (8). The width and length of the upper blade body (201) are adapted to the distance between adjacent heat exchange plates (3) and the radius of the inscribed circle of the heat exchange plate (3), respectively. The length of the single-sided blade body does not exceed half the length of the heat exchange plate (3). The blade shape of the upper blade body (201) is a straight blade shape, and the blade shape of the lower blade body (202) is a slanted blade shape.

2. A modular horizontal evaporator according to claim 1, characterized in that: The housing (1) has a core support rail (11) inside along the length of the housing (1), and the core support rail (11) is adapted to the core frame (4) to support the core module.

3. A modular horizontal evaporator according to claim 1, characterized in that: The housing (1) is provided with a steam inlet sleeve (62) 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) located above the core frame (4). 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.

4. A modular horizontal evaporator according to claim 1, characterized in that: A condensate sleeve (133) is provided on the housing (1) at the condensate outlet (13). An external condensate pipe passes through the condensate sleeve (133) and is connected to the condensate main pipe (12) located below the core frame (4). A condensate pipe sealing filler (132) is filled between the condensate sleeve (133) and the external condensate pipe. 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 sealing between the condensate sleeve (133) and the external condensate pipe.

5. A modular horizontal evaporator according to claim 1, characterized in that: Multiple scrapers (2) are installed symmetrically with respect to the radial cross section at the axial center point of the drive shaft (8).

6. A modular horizontal evaporator according to claim 1, characterized in that: The heat exchange plate (3) is provided with a steam inlet branch pipe (32) at the top and a condensate branch pipe (31) at the bottom. A heat exchange shaft hole (33) is provided at the center of the heat exchange plate (3) for the drive shaft (8) to pass through.

7. A modular horizontal evaporator according to claim 1, characterized in that: The heat exchange plate (3) has a honeycomb bulging hollow plate structure.

8. A modular horizontal evaporator according to claim 1, characterized in that: The core module also includes a steam inlet manifold (5), which is located above the core frame (4) and is connected to the steam inlet branch pipes (32) of the multiple heat exchange plates (3).

9. A modular horizontal evaporator according to claim 1, characterized in that: The core module also includes a condensate main pipe (12), which is located below the core frame (4) and is connected to the condensate branch pipes (31) of the multiple heat exchange plates (3).

10. A modular horizontal evaporator according to claim 1, characterized in that: The top of the shell (1) is provided with a secondary steam outlet (17).

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