Drying apparatus and drying system

Abstract

The application discloses a drying device and a drying system. The drying device comprises a shell, a heating device and a first heat exchange pipe. The shell has a feeding port for wet material and a discharging port for dry material. The heating device is used for heating the wet material. The first heat exchange pipe is used for heat exchange with the wet material. The first heat exchange pipe has a first steam inlet and a first condensate outlet. The first steam inlet is communicated with an inner space of the shell, and steam generated by the heated wet material enters the first heat exchange pipe. The first condensate outlet is communicated with an outer space of the shell, and water formed by condensation of the steam in the first heat exchange pipe is discharged out of the shell. Compared with the prior art, the application can realize recycling of the condensation heat of the steam generated by evaporation of the wet material.

Description

Technical Field

[0001] This invention relates to the field of wet material drying technology, and in particular to a drying device and drying system. Background Technology

[0002] Drying and dehydrating wet materials requires a large amount of energy to evaporate the moisture in the wet materials. The drying process will discharge a large amount of water vapor containing high condensation heat. The condensation heat in the discharged water vapor accounts for about 87% of the total heat of the discharged water vapor. However, current drying equipment cannot recover and utilize this part of the heat. Summary of the Invention

[0003] The purpose of this invention is to provide a drying device and drying system for recovering and utilizing the heat of condensation from the evaporation of wet materials.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention discloses a drying apparatus, comprising: The housing has a feed port for wet materials to enter and a discharge port for dry materials to exit; A heating device is used to heat the wet material; The first heat exchange tube is used for heat exchange with the wet material. The first heat exchange tube has a first steam inlet and a first condensate outlet. The first steam inlet is connected to the internal space of the shell, allowing steam generated by the heating of the wet material to enter the first heat exchange tube. The first condensate outlet is connected to the external space of the shell, allowing water formed by the condensation of the steam in the first heat exchange tube to be discharged from the shell.

[0005] Preferably, the heating device includes a second heat exchange tube for contacting and exchanging heat with the wet material, the second heat exchange tube having a second steam inlet and a second condensate outlet; the second steam inlet is connected to a steam generator; the second condensate outlet is connected to the external space of the shell and is used to discharge the water formed by the condensation of the steam from the shell.

[0006] Preferably, it further includes a material support plate installed inside the housing, the material support plate having a receiving end and an exit end, the wet material entering the material support plate from the receiving end and exiting the material support plate from the exit end; a plurality of heat exchange tubes for heating the wet material on the material support plate are arranged above the material support plate, the heat exchange tubes being either the first heat exchange tube or the second heat exchange tube.

[0007] Preferably, it further includes a unidirectional pushing assembly installed inside the housing, the unidirectional pushing assembly including a second driving device, a moving unit and a pushing plate; the second driving device is connected to the moving unit and is used to drive the moving unit to perform reciprocating linear motion; the upper part of the pushing plate is hinged to the moving unit, and the lower part of the pushing plate, on the side away from the departure end, is detachably abutted against the moving unit.

[0008] Preferably, the material receiving plate is a corrugated plate, the heat exchange tube is parallel to the extension direction of the troughs on the corrugated plate, and the receiving end and the departing end are located at the two ends of the troughs respectively.

[0009] Preferably, the device further includes a water collection tray installed inside the housing, the water collection tray being located below the material receiving plate and used to collect water droplets falling from the material receiving plate; the outlet of the water collection tray is connected to the external space of the housing and used to discharge the water collected by the water collection tray into the housing.

[0010] Preferably, fins are installed on the outer walls of both the first heat exchange tube and the second heat exchange tube.

[0011] Preferably, it further includes a first driving device for driving the heat exchange tube to rotate, the first driving device being connected to the heat exchange tube in a driving connection; the fins are spiral-shaped, so that when the heat exchange tube rotates, the fins push the wet material on the support plate, causing the wet material on the support plate to move from the receiving end to the leaving end.

[0012] Preferably, a plurality of heat exchange units are arranged from top to bottom inside the shell. Each heat exchange unit includes the material support plate and a plurality of heat exchange tubes above the material support plate. The wet material is fed from top to bottom between the plurality of heat exchange units.

[0013] The present invention also discloses a drying system, including the above-described drying equipment, and further comprising: A wet material supply system, which is connected to the feed port, is used to feed the wet material into the feed port; A condensate recovery system, connected to the first condensate outlet, is used to collect moisture from the wet material; A dry material collection system, which is connected to the discharge port, is used to collect the dry material obtained after processing by the drying equipment.

[0014] The present invention achieves the following technical effects compared to the prior art: In this invention, the steam generated by the heating of wet material condenses and releases heat within the first heat exchange tube, raising the temperature of the tube. The first heat exchange tube then exchanges heat with the wet material on its surface, thus achieving in-situ recovery and utilization of waste steam heat. Furthermore, the water formed by the condensation of steam within the first heat exchange tube can be recycled after being discharged from the shell, thereby conserving water resources. In addition, the direct condensation of steam within the shell saves on the purchase and operating costs of steam treatment equipment such as induced draft fans, dust collectors, and condensers, further reducing energy consumption. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the drying system in this embodiment; Figure 2 This is a front view of the drying equipment in this embodiment; Figure 3 for Figure 2 Side view of the middle structure; Figure 4 for Figure 2 Top view of the structure.

[0017] Among them, 1-receiving hopper, 2-wet material conveyor, 3-buffer hopper, 4-quantitative feeder; 5-Drying equipment, 5-1-Feeding port, 5-2-Discharge port, 5-3-Motor, 5-4-Reducer, 5-5-Drive gear, 5-6-Driven gear, 5-7-Lower heat exchange tube assembly, 5-8-Upper heat exchange tube assembly, 5-9-Outer bearing, 5-10-Positioning plate, 5-11-First water collection pipe, 5-12-Second water collection pipe, 5-13-Material support plate, 5-14-Isolation strip, 5-15-Water collection tray, 5-16-Secondary crossbeam of the support, 5-17-Main crossbeam of the support, 5-18-Column of the support, 5-19-Shell, 5-20-Insulation layer, 5-21-Push plate, 5-22-Sleeve, 5-23-Through rod, 5-24-Block rod, 5-25-Guide rail, 5-26-Connecting rod, 5-27-Piston rod; 6-Screw conveyor, 7-Airlock discharge valve, 8-Dry material conveyor, 9-Finished product buffer bin, 10-Steam generator, 11-Steam main pipe, 12-Steam distribution pipe, 13-First drain pipe, 14-First steam trap, 15-First flow meter, 16-First water collection tank, 17-First water pump, 18-Second drain pipe, 19-Second steam trap, 20-Second flow meter, 21-Second water collection tank, 22-Second water pump, 23-Water purification tank, 24-Steam regulating valve, 25-Third flow meter, 26-First pressure gauge, 27-First thermometer, 28-Second pressure gauge, 29-Second thermometer, 30-Third thermometer, 31-Fourth thermometer, 32-Fifth thermometer, 33-Sixth thermometer, 34-Electrical control cabinet, 35-Hydraulic station. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a drying device and drying system for recovering and utilizing the heat of condensation from the evaporation of wet materials.

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. In this embodiment, wet materials refer to powders, sludge, and granular materials containing a certain amount of moisture and requiring drying and dehydration, including high-salinity wastewater, municipal sludge, carbide slag, desulfurization gypsum, phosphogypsum, blast furnace slag, coal slime, coal powder, and tailings slime. The moisture content of the wet materials can be 1% to 100%. In this embodiment, the connection can be direct or indirect through an intermediate structure.

[0021] Reference Figures 2-4 This embodiment provides a drying device 5, including a shell 5-19, a heating device, and a first heat exchange tube. The shell 5-19 has a feed port 5-1 for wet material to enter and a discharge port 5-2 for dry material to exit. The heating device is used to heat the wet material. The first heat exchange tube is used for heat exchange with the wet material, and has a first steam inlet and a first condensate outlet. The first steam inlet communicates with the internal space of the shell 5-19, and steam generated by the heating of the wet material enters the first heat exchange tube. The first condensate outlet communicates with the external space of the shell 5-19, and is used to discharge water formed by the condensation of steam in the first heat exchange tube from the shell 5-19.

[0022] In operation, the drying equipment 5 generates steam from the heated wet material, which condenses and releases heat within the first heat exchange tube, raising its temperature. The first heat exchange tube then contacts the wet material on its surface for heat exchange, thus achieving in-situ recovery and utilization of waste steam heat. Furthermore, the water formed by the condensation of steam within the first heat exchange tube can be recycled after being discharged from the shell 5-19, thereby conserving water resources. Additionally, the direct condensation of steam within the shell 5-19 saves on the purchase and operating costs of steam treatment equipment such as induced draft fans, dust collectors, and condensers, further reducing energy consumption.

[0023] For the aforementioned drying equipment 5, the movement of the wet material inside the shell 5-19 from the feed port 5-1 to the discharge port 5-2 can be driven by gravity or by some driving device, as long as the first heat exchange tube can make heat exchange contact with the wet material during this process.

[0024] As one possible example, the heating device includes a second heat exchange tube for contacting and exchanging heat with the wet material. The second heat exchange tube has a second steam inlet and a second condensate outlet. The second steam inlet is connected to a steam generator 10. The second condensate outlet is connected to the external space of the housing 5-19 and is used to discharge water formed by the condensation of steam from the housing 5-19. However, the actual implementation is not limited to this. For example, the heating device may also be other types such as a resistance temperature detector (RTD) heating device or a circulating water heating device.

[0025] As one possible example, the drying equipment 5 also includes a receiving plate 5-13 installed within the housing 5-19, the receiving plate 5-13 having a receiving end and an exit end. Wet material enters the receiving plate 5-13 from the receiving end and exits from the exit end. Several heat exchange tubes, either a first heat exchange tube or a second heat exchange tube, are arranged above the receiving plate 5-13 for heating the wet material on it. Compared to the direct falling motion under gravity, the receiving plate 5-13's support of the wet material allows for a longer heat exchange time between the wet material and the heat exchange tubes. Furthermore, the evaporated water vapor released from the heated wet material flows to the lower surface of the receiving plate 5-13, condenses on the lower surface, and heats the receiving plate 5-13, thereby heating the wet material on it.

[0026] In this embodiment, the heat exchange tubes above the material support plate 5-13 include a lower heat exchange tube group 5-7 located on the lower layer and an upper heat exchange tube group 5-8 located on the upper layer. The vertical projection positions of the heat exchange tubes in the lower heat exchange tube group 5-7 are offset from the vertical projection positions of the heat exchange tubes in the upper heat exchange tube group 5-8.

[0027] In this embodiment, the ratio of the number of the first heat exchange tube to the number of the second heat exchange tube is between 1:1 and 4:1.

[0028] As one possible example, the drying equipment 5 also includes a unidirectional pushing assembly installed within the housing 5-19. The unidirectional pushing assembly includes a second drive device, a moving unit, and a pushing plate 5-21. The second drive device is connected to the moving unit and drives the moving unit to perform reciprocating linear motion. The upper part of the pushing plate 5-21 is hinged to the moving unit, and the lower part of the pushing plate 5-21, away from the exit end, is detachably abutted against the moving unit. When the moving unit moves towards the exit end, it abuts against the lower part of the pushing plate 5-21, pushing the wet material towards the exit end via the pushing plate 5-21. When the moving unit moves towards the receiving end, the wet material pushes the pushing plate 5-21 to rotate around the hinged position on the upper part of the pushing plate 5-21, causing the pushing plate 5-21 to avoid the wet material. At this time, the lower part of the pushing plate 5-21 no longer abuts against the moving unit. With the above structure, the unidirectional pushing of the wet material by the pushing plate 5-21 can be achieved. When the installation position of the pusher plate 5-21 is close enough to the heat exchange tube, the wet material on the heat exchange tube can also be scraped off through the pusher plate 5-21.

[0029] In this embodiment, since the unidirectional pushing component can provide the motion power for the wet material on the support plate 5-13, the support plate 5-13 can be horizontally arranged, that is, the wet material on the support plate 5-13 is not driven by gravity. Correspondingly, the heat exchange tube can also be horizontally arranged.

[0030] In this embodiment, the second driving device is a hydraulic cylinder, and the moving unit includes a through rod 5-23, a stop rod 5-24, a guide rail 5-25, a connecting rod 5-26, and a guide groove. A sleeve 5-22 is welded to the upper part of the pusher plate 5-21, and the through rod 5-23 passes through the sleeve 5-22 and can rotate relative to the sleeve 5-22. The through rod 5-23 and the stop rod 5-24 are horizontally arranged and both are fixed to the guide rail 5-25. The through rod 5-23 is located above the stop rod 5-24, and the stop rod 5-24 can be detachably abutted against the lower part of the pusher plate 5-21 away from the exit end. The piston rod 5-27 of the hydraulic cylinder is fixedly connected to the connecting rod 5-26, and the connecting rod 5-26 is fixedly connected to the stop rod 5-24, so that the moving unit can be driven to translate by the hydraulic cylinder. An end plate is fixed on the material support plate 5-13. The end plate is provided with a guide groove. The guide rail 5-25 passes through the guide groove to achieve a sliding connection between the guide rail 5-25 and the end plate.

[0031] As a possible example, the receiving plate 5-13 is a corrugated plate, with the heat exchange tubes extending parallel to the direction of the troughs on the corrugated plate. The receiving end and the exit end are located at opposite ends of the troughs. The troughs on the corrugated plate can guide the movement of the wet material, preventing it from falling off from locations other than the exit end.

[0032] As one possible example, the drying device 5 also includes a water collection tray 5-15 installed inside the housing 5-19. The water collection tray 5-15 is located below the material receiving plate 5-13 and is used to collect water droplets falling from the material receiving plate 5-13, preventing water droplets from falling onto the wet material below the material receiving plate 5-13. The outlet of the water collection tray 5-15 communicates with the external space of the housing 5-19 to discharge the collected condensate from the housing 5-19.

[0033] As a possible example, fins are installed on the outer walls of both the first and second heat exchange tubes to increase the heat exchange area with the wet material and improve the heat exchange efficiency.

[0034] As one possible example, the drying equipment 5 also includes a first drive device for driving the heat exchange tubes to rotate, the first drive device being connected to the heat exchange tubes via a drive mechanism. The fins are helical, so that when the heat exchange tubes rotate, the fins push the wet material on the receiving plate 5-13, causing the wet material on the receiving plate 5-13 to move from the receiving end to the leaving end. Simultaneously, the rotation of the fins can also disperse and agitate the wet material, improving heat exchange efficiency.

[0035] In this embodiment, the fin thickness is 0.5mm~3.0mm, the fin height is 5mm~20mm, and the fin pitch is 5mm~50mm. If the scheme of staggering the vertical projection positions of the heat exchange tubes in the lower heat exchange tube group 5-7 and the heat exchange tubes in the upper heat exchange tube group 5-8 is adopted, the center distance between adjacent heat exchange tubes is preferably the sum of the radii of two adjacent heat exchange tubes plus 2 to 3 times the fin height.

[0036] In this embodiment, the first driving device is a motor 5-3, which is connected to the heat exchange tubes via a reducer 5-4, a driving gear 5-5, and a driven gear 5-6. Specifically, the output shaft of the motor 5-3 is fixedly connected to the input shaft of the reducer 5-4, and the output shaft of the reducer 5-4 is coaxially fixedly connected to the driving gear 5-5. The driving gear 5-5 meshes with the driven gear 5-6, which is fixedly sleeved on the outside of the heat exchange tube. In the lower heat exchange tube group 5-7, the driven gears 5-6 on adjacent heat exchange tubes mesh with each other. In the upper heat exchange tube group 5-8, the driven gears 5-6 on adjacent heat exchange tubes mesh with each other. The driving gear 5-5 meshes with the driven gear 5-6 on the heat exchange tube at the end of the lower heat exchange tube group 5-7, and also meshes with the driven gear 5-6 on the heat exchange tube at the end of the upper heat exchange tube group 5-8. In order to achieve unidirectional material feeding from the heat pipes above the support plate 5-13, in this example, the fins on two adjacent heat exchange tubes in the same heat exchange tube group should rotate in opposite directions.

[0037] In this embodiment, the rotation speed of the heat exchange tube ranges from 5 rpm to 130 rpm.

[0038] In this embodiment, the first condensate outlet of the first heat exchange tube is rotatably connected to the inlet of the first water collecting pipe 5-11 via an external bearing 5-9. The external bearing 5-9 is located outside the first heat exchange tube and inside the first water collecting pipe 5-11. The second condensate outlet of the second heat exchange tube is rotatably connected to the inlet of the second water collecting pipe 5-12 via an external bearing 5-9. The external bearing 5-9 is located outside the second heat exchange tube and inside the second water collecting pipe 5-12. Condensate from the first heat exchange tube flows into the first water collecting pipe 5-11 and is guided to the outside of the housing 5-19. Condensate from the second heat exchange tube flows into the second water collecting pipe 5-12 and is guided to the outside of the housing 5-19.

[0039] As a possible example, multiple heat exchange units are arranged from top to bottom inside the shell 5-19. Each heat exchange unit includes a material support plate 5-13 and several heat exchange tubes above the material support plate 5-13. The wet material is dropped from top to bottom between the multiple heat exchange units to achieve multiple heat exchange.

[0040] In this embodiment, in the plumb direction, the receiving end and the departing end of the material receiving plate 5-13 are alternately arranged to achieve a serpentine drop of wet material, while also improving the space utilization rate within the shell 5-19. The number of first driving devices is the same as the number of heat exchange units, with each heat exchange unit corresponding to one first driving device.

[0041] As one possible example, a support frame fixed relative to the housing 5-19 is provided inside the housing 5-19. The support frame includes secondary crossbeams 5-16, main crossbeams 5-17, and support columns 5-18. Multiple support columns 5-18 are arranged in a rectangular array, with their lower ends passing downwards through the bottom of the housing 5-19 and resting on the ground. The main crossbeams 5-17 are simultaneously and vertically fixed to multiple support columns 5-18, and the two ends of the secondary crossbeams 5-16 are respectively and vertically fixed to two main crossbeams 5-17. Some components inside the housing 5-19 can be mounted on the support frame, thus indirectly mounted on the housing 5-19. Alternatively, those skilled in the art may choose to directly mount some components inside the housing 5-19 onto the housing 5-19, or onto other structures fixed relative to the housing 5-19.

[0042] In this embodiment, the feed port 5-1, the discharge port 5-2, the water collection tray 5-15, the motor 5-3, and the reducer 5-4 are all fixed on the bracket. A partition strip 5-14 is provided on the water collection tray 5-15. The lower end of the partition strip 5-14 is fixedly connected to the water collection tray 5-15, and the upper end of the partition strip 5-14 is fixedly connected to the material support plate 5-13 to support the material support plate 5-13.

[0043] As one possible example, the outer shell 5-19 is covered with an insulation layer 5-20 to achieve the effect of heat preservation.

[0044] As one possible example, a positioning plate 5-10, fixed relative to the housing 5-19, is provided inside the housing 5-19, and the positioning plate 5-10 is vertically arranged. Some components inside the housing 5-19 can be mounted on the positioning plate 5-10, thereby indirectly mounted on the housing 5-19. Alternatively, those skilled in the art may choose to directly mount some components inside the housing 5-19 onto the housing 5-19, or onto other structures fixed relative to the housing 5-19.

[0045] In this embodiment, both the first heat exchange tube and the second heat exchange tube are rotatably mounted on the positioning plate 5-10, and the hydraulic cylinder is fixed on the positioning plate 5-10.

[0046] Reference Figure 1 This embodiment also provides a drying system, including the aforementioned drying equipment 5, and further including a wet material supply system, a condensate recovery system, and a dry material collection system. The wet material supply system is connected to the feed port 5-1 and is used to feed wet material into the feed port 5-1. The condensate recovery system is connected to the first condensate outlet and is used to collect moisture from the wet material. The dry material collection system is connected to the discharge port 5-2 and is used to collect the dry material obtained after processing by the drying equipment 5.

[0047] Since the drying system has the aforementioned drying equipment 5, it also possesses the technical effects of the aforementioned drying equipment 5, which will not be elaborated here.

[0048] When the drying equipment 5 is selected with a water collection tray 5-15, the condensate recovery system is also connected to the water collection tray 5-15 to further collect moisture from the wet material.

[0049] When the heating device of the drying equipment 5 is the second heat exchange tube described above, as a possible example, the drying system also includes a steam supply system and a condensate circulation system. The steam supply system is connected to the second steam inlet and is used to supply high-temperature steam into the second heat exchange tube. The condensate circulation system is connected to both the second condensate outlet and the steam supply system to refill the condensed water in the second heat exchange tube into the steam supply system, thereby achieving the recycling of the water required by the heating device.

[0050] As one possible example, the wet material supply system includes a receiving hopper 1, a wet material conveyor 2, a buffer hopper 3, and a quantitative feeder 4 arranged sequentially along the conveying direction of the wet material. The receiving hopper 1 is located above the first end of the wet material conveyor 2, the buffer hopper 3 is located below the second end of the wet material conveyor 2, the outlet of the buffer hopper 3 is fixedly connected to the inlet of the quantitative feeder 4, and the outlet of the quantitative feeder 4 is fixedly connected to the feed port 5-1 of the housing 5-19.

[0051] As one possible example, the condensate recovery system includes a second drain pipe 18, a second steam trap 19, a second collection tank 21, a second water pump 22, and a water purification tank 23. The first inlet end of the second drain pipe 18 is fixedly connected to the outlet of the first collection pipe 5-11, the second inlet end of the second drain pipe 18 is connected to the outlet of the collection pan 5-15 via a pipe, the outlet end of the second drain pipe 18 is fixedly connected to the inlet of the second collection tank 21, the second steam trap 19 is installed on the second drain pipe 18, the outlet of the second collection tank 21 is fixedly connected to the inlet of the second water pump 22, and the outlet of the second water pump 22 is fixedly connected to the inlet of the water purification tank 23.

[0052] In this embodiment, a sixth thermometer 33 and a second flow meter 20 are also installed on the second drain pipe 18 to monitor the outlet water temperature and flow rate of the second drain pipe 18 in real time.

[0053] As a possible example, the dry material collection system includes a screw conveyor 6, an airlock discharge valve 7, a dry material conveyor 8, and a finished product buffer silo 9. The inlet of the screw conveyor 6 is fixedly connected to the outlet 5-2 of the casing 5-19, the outlet of the screw conveyor 6 is fixedly connected to the inlet of the airlock discharge valve 7, the outlet of the airlock discharge valve 7 is fixedly connected to the inlet of the dry material conveyor 8, and the outlet of the dry material conveyor 8 is fixedly connected to the inlet of the finished product buffer silo 9.

[0054] As a possible example, the steam supply system includes a steam generator 10, a steam regulating valve 24, a steam main pipe 11, and a steam distribution pipe 12. The outlet of the steam generator 10 is fixedly connected to the inlet of the steam main pipe 11. Multiple branch outlets of the steam main pipe 11 are fixedly connected to the inlets of multiple steam distribution pipes 12, and the outlets of the multiple steam distribution pipes 12 are fixedly connected to the second steam inlets of multiple second heat exchange tubes. The steam regulating valve 24 is installed on the steam main pipe 11.

[0055] In this embodiment, a third flow meter 25, a first pressure gauge 26 and a first temperature measuring instrument 27 are also installed on the steam pipe 11 to monitor the flow rate, pressure and temperature of the steam in the steam pipe 11 in real time.

[0056] As one possible example, the condensate circulation system includes a first drain pipe 13, a first steam trap 14, a first water collection tank 16, and a first water pump 17. The first end of the first drain pipe 13 is fixedly connected to the outlet of the second water collection pipe 5-12, and the second end of the first drain pipe 13 is fixedly connected to the inlet of the first water collection tank 16. The first steam trap 14 is installed on the first drain pipe 13. The outlet of the first water collection tank 16 is fixedly connected to the inlet of the first water pump 17, and the outlet of the first water pump 17 is fixedly connected to the inlet of the steam generator 10.

[0057] In this embodiment, a fifth thermometer 32 and a first flow meter 15 are also installed on the first drain pipe 13 to monitor the outlet water temperature and flow rate of the first drain pipe 13 in real time.

[0058] As a possible example, a second pressure gauge 28, a second temperature measuring instrument 29, a third temperature measuring instrument 30, and a fourth temperature measuring instrument 31 are also installed on the housing 5-19 of the drying equipment 5. The second pressure gauge is used to measure the pressure inside the housing 5-19, and the second temperature measuring instrument 29, the third temperature measuring instrument 30, and the fourth temperature measuring instrument 31 are used to measure the temperature of the upper, middle, and lower parts of the housing 5-19, respectively.

[0059] As a possible example, the drying system also includes an electrical control cabinet 34, which is electrically connected to the motor 5-3, the first thermometer 27, the second thermometer 29, the third thermometer 30, the fourth thermometer 31, the fifth thermometer 32, the sixth thermometer 33, the first flow meter 15, the second flow meter 20, the third flow meter 25, the first pressure gauge 26, the second pressure gauge 28, the first water pump 17, and the second water pump 22, respectively, for displaying temperature, pressure, flow rate and regulating the speed of the motor 5-3.

[0060] As one possible example, the drying system also includes a hydraulic station 35, which is connected to a hydraulic cylinder for supplying hydraulic oil to the hydraulic cylinder.

[0061] In this embodiment, the drying system operates as follows: The first step is heating. Steam generated from steam generator 10 passes through steam main pipe 11, steam regulating valve 24, third flow meter 25, first pressure gauge 26, first thermometer 27, and steam distribution pipe 12 before entering the second heat exchange tube. The second heat exchange tube heats up, causing the second thermometer 29, third thermometer 30, and fourth thermometer 31 in electrical control cabinet 34 to display the preset temperature, thus starting the second step of speed regulation.

[0062] The second step is speed adjustment. Simultaneously start motor 5-3 and adjust its speed to the set speed. The power output from motor 5-3 is transmitted to reducer 5-4, which drives the drive gear 5-5 to rotate. The drive gear 5-5 drives the driven gear 5-6 to rotate, and the driven gear 5-6 drives the heat exchange tube to rotate around its axis. Start hydraulic station 35, which simultaneously drives piston rod 5-27, connecting rod 5-26, guide rail 5-25, stop rod 5-24, through rod 5-23, sleeve 5-22, and push plate 5-21 to reciprocate. After the entire system is running stably, the feeding step begins.

[0063] The third step is feeding. Turn on the wet material conveyor 2 to transport the wet material into the buffer hopper 3, and then feed the wet material into the feed inlet of the drying equipment 5 through the quantitative feeder 4 to start the drying and dehydration process.

[0064] The fourth step is drying and dehydration. The wet material entering the drying equipment 5 first falls onto the uppermost heat exchange unit. In this heat exchange unit, on the one hand, the wet material passes sequentially through the upper heat exchange tube group 5-8 and the lower heat exchange tube group 5-7 before falling onto the material receiving plate 5-13; on the other hand, as the wet material falls, it is dispersed and agitated by the fins and propelled towards the exit end by the fins and the pusher plate 5-21. During this process, the wet material is heated and dehydrated by the first and second heat exchange tubes until it falls from the exit end to the next heat exchange unit.

[0065] The material falls repeatedly until it reaches the discharge port and is discharged from the drying equipment 5, completing the drying and dehydration process.

[0066] Steam entering the second heat exchange tube undergoes heat exchange with the wet material through the second heat exchange tube and fins. After heat exchange, the condensate obtained from the steam condensation enters the second water collection pipe 5-12, and then enters the first steam trap 14 through the first drain pipe 13. It then enters the first flow meter 15 through the pipeline, and from the first flow meter 15, it enters the first water collection tank 16 through the pipeline. Finally, it is pumped into the water supply pipe of the steam generator 10 by the first water pump 17, realizing recycling and completing the process of steam heat exchange and steam condensate recovery.

[0067] Part of the evaporated water vapor released from the wet material by heating enters the first heat exchange tube, while the other part flows to the lower side of the support plate 5-13, where it condenses on the inner wall of the first heat exchange tube and the lower surface of the support plate 5-13, respectively. The heat released by condensation is transferred to the wet material through the first heat exchange tube and the support plate 5-13. The condensate in the first heat exchange tube enters the first water collection pipe 5-11, and the condensate on the lower surface of the support plate 5-13 drips into the water collection pan 5-15. The water in the first water collection pipe 5-11 and the water collection pan 5-15 enters the second drain pipe 18, then flows into the second steam trap 19, then into the second flow meter 20, then into the second water collection pool 21, and finally is pumped into the water purification pool 23 by the second water pump 22 for further processing and utilization, thus completing the waste heat recovery of the evaporated water vapor from the wet material and the recycling of water resources.

[0068] Step 5: Product conveying and buffering. The dried material after drying and dehydration enters the screw conveyor from the discharge port 5-2 of the drying equipment 5, then is discharged into the dry material conveyor through the steam lock discharge valve, and finally is conveyed by the dry material conveyor into the dry material buffer bin for later use.

[0069] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as limiting the present invention.

Claims

1. A drying device, characterized in that, include: The housing has a feed port for wet materials to enter and a discharge port for dry materials to exit; A heating device is used to heat the wet material; The first heat exchange tube is used for heat exchange with the wet material. The first heat exchange tube has a first steam inlet and a first condensate outlet. The first steam inlet is connected to the internal space of the shell, allowing steam generated by the heating of the wet material to enter the first heat exchange tube. The first condensate outlet is connected to the external space of the shell, allowing water formed by the condensation of the steam in the first heat exchange tube to be discharged from the shell. The heating device includes a second heat exchange tube for contacting and exchanging heat with the wet material. The second heat exchange tube has a second steam inlet and a second condensate outlet. The second steam inlet is connected to a steam generator. The second condensate outlet is connected to the external space of the shell and is used to discharge the water formed by the condensation of the steam from the shell. It also includes a material support plate installed inside the housing, the material support plate having a receiving end and an exit end, the wet material entering the material support plate from the receiving end and exiting the material support plate from the exit end; a plurality of heat exchange tubes for heating the wet material on the material support plate are provided above the material support plate, the heat exchange tubes being either the first heat exchange tube or the second heat exchange tube; It also includes a one-way pushing assembly installed in the housing, the one-way pushing assembly including a second driving device, a moving unit and a pushing plate; the second driving device is connected to the moving unit and is used to drive the moving unit to perform reciprocating linear motion; the upper part of the pushing plate is hinged to the moving unit, and the lower part of the pushing plate on the side away from the departure end is detachably abutted against the moving unit. The housing contains multiple heat exchange units arranged from top to bottom. Each heat exchange unit includes a material support plate and several heat exchange tubes above the material support plate. The wet material is fed sequentially from top to bottom between the multiple heat exchange units.

2. The drying equipment according to claim 1, characterized in that, The material receiving plate is a corrugated plate, and the heat exchange tube is parallel to the extension direction of the troughs on the corrugated plate. The receiving end and the departing end are located at the two ends of the troughs, respectively.

3. The drying equipment according to claim 1, characterized in that, It also includes a water collection tray installed inside the housing, the water collection tray being located below the material receiving plate, for collecting water droplets falling from the material receiving plate; the water outlet of the water collection tray is connected to the external space of the housing, for discharging the water collected by the water collection tray from the housing.

4. The drying equipment according to claim 1, characterized in that, Fins are installed on the outer walls of both the first heat exchange tube and the second heat exchange tube.

5. The drying equipment according to claim 4, characterized in that, It also includes a first driving device for driving the heat exchange tube to rotate, the first driving device being connected to the heat exchange tube in a driving connection; the fins are spiral-shaped, so that when the heat exchange tube rotates, the fins push the wet material on the support plate, causing the wet material on the support plate to move from the receiving end to the leaving end.

6. A drying system, characterized in that, The drying apparatus, including any one of claims 1-5, further includes: A wet material supply system, which is connected to the feed port, is used to feed the wet material into the feed port; A condensate recovery system, connected to the first condensate outlet, is used to collect moisture from the wet material; A dry material collection system, which is connected to the discharge port, is used to collect the dry material obtained after processing by the drying equipment.

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