Wastewater drying system and drying device thereof

Abstract

Embodiments of the present invention provide a wastewater drying system comprising: a drying tray configured to rotate about an axis parallel to a horizontal direction, the drying tray comprising at least one heating surface extending perpendicular to the axis; the heat source is configured to generate heat energy and heat the drying tray; a dispensing nozzle comprising at least one opening configured to dispense concentrated wastewater to a heating surface of the drying tray; and the scraping element is arranged facing the heating surface and is configured to remove sludge which is formed by solidification due to heating on the heating surface of the drying disc. The embodiment of the invention further provides a wastewater drying system comprising the drying device.

Description

Technical Field

[0001] The embodiments of the present invention relate to a wastewater drying system and a drying device thereof, and in particular to a wastewater drying system and a drying device thereof having a vertical drying plate. Background Art

[0002] As environmental regulations become increasingly stringent, manufacturers are required to upgrade their in-plant water treatment equipment to reduce the total amount of wastewater discharged or even completely avoid wastewater discharge. On the other hand, in order to reduce greenhouse gas emissions and achieve the goal of reducing carbon footprint, manufacturers are also expected to abandon traditional fossil fuels as energy and use renewable electricity for the above water treatment procedures.

[0003] Although traditional distillation equipment can reduce the concentration of sewage, it is quite energy-consuming. The higher the boiling point of wastewater, the more energy is needed to evaporate it. However, if the boiling point and pressure of wastewater are not increased in order to reduce energy consumption, the boiling liquid will be vaporized in the pipeline in advance, generating water mist and crystal particles, which will then cause the crystal particles to block the pipeline and affect the distillation efficiency.

[0004] Mechanical Vapor Recompression System (MVR System) provides a solution for traditional distillation equipment, which recycles the heat energy from the steam compressor to produce more steam to reduce energy demand. Manufacturers can use MVR system to treat or recycle industrial high-concentration wastewater (such as nitrate nitrogen) at a lower cost, or use MVR system to desalinate seawater to provide increasingly scarce water resources.

[0005] After the wastewater is treated by the MVR system, it needs to be further dried by a dryer to turn the saturated wastewater into sludge before it can be landfilled or reused. The dryers commonly used in the industry currently usually include a barrel tank with a single drum inside. After the wastewater enters the barrel tank, the drum uses heat energy to dry it into sludge. However, due to the huge size of such drums, they occupy an area about the size of a standard container. If additional heating equipment, barrel tanks and other devices are added to maintain the operation of the dryer, the entire system will occupy a very large area. In an era of increasingly scarce land resources, it is not practical. In addition, using a drum to directly heat the wastewater consumes a lot of energy, which is not conducive to reducing carbon dioxide emissions. Summary of the invention

[0006] In view of the defects of traditional dryers, the embodiments of the present invention propose a new wastewater drying system and a drying device thereof, which, compared with traditional dryers, have the advantages of low energy consumption, small footprint and environmental friendliness.

[0007] According to one embodiment of the present invention, a drying device includes: a drying plate configured to rotate around an axis parallel to a horizontal direction, the drying plate including at least one heating surface extending perpendicular to the axis; a heat source configured to generate thermal energy and heat the drying plate; a distribution nozzle including at least one opening, the opening configured to distribute concentrated wastewater to the heating surface of the drying plate; and a scraping element disposed relative to the heating surface and configured to remove sludge solidified by heating on the heating surface of the drying plate.

[0008] According to one embodiment of the present invention, the wastewater drying system using the above-mentioned drying device further comprises a flash drum, which is fluidically connected to the drying device. The flash drum is configured to receive wastewater and perform a first drying process on the wastewater, and the drying device is configured to receive concentrated wastewater from the flash drum and perform a second drying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] By combining the following description and referring to the accompanying drawings, various aspects of the embodiments of the present invention can be better understood. It should be noted that various structures are not drawn to scale, and some dimensions may be exaggerated or reduced for the sake of clarity.

[0010] Figure 1 A schematic diagram showing a wastewater drying system according to some embodiments of the present invention.

[0011] Figure 2 A schematic diagram showing a flash drum and its connecting pipelines according to some embodiments of the present invention.

[0012] Figure 3 Schematic diagram showing a drying device according to some embodiments of the present invention Figure 1 .

[0013] Figure 4 Schematic diagram showing a drying device according to some embodiments of the present invention Figure 2 .

[0014] Figure 5 Schematic diagram showing a drying device according to some embodiments of the present invention Figure 3 .

[0015] Figure 6 A schematic diagram showing the relative relationship of a drying plate, a dispensing nozzle and a scraping element according to some embodiments of the present invention.

[0016] Figure 7 An exploded view of the structure of a drying plate according to some embodiments of the present invention is shown.

[0017] Figure 8 Schematic diagram showing a drying device according to some embodiments of the present invention Figure 4 . DETAILED DESCRIPTION

[0018] A number of embodiments or examples for implementing different features of the provided subject matter will be described below. To simplify the present disclosure, specific components and configurations will be described, but this is only an example and should not be considered as limiting.

[0019] In addition, the spatial relative terms used herein (e.g., "lower", "below", "above", "above...", etc.) are for convenience of description and are based on the orientation shown in the drawings. Unless otherwise expressly stated, these terms should not be considered limiting. Those skilled in the art should understand that these terms cover different orientations of the device in use or operation.

[0020] In addition, the terms "first", "second", and "third" etc. used herein are merely used to distinguish different components, parts, regions, layers or sections, and should not be construed as indicating their order or importance.

[0021] The terms "approximately", "substantially", "substantially" and "about" used herein indicate that some deviation or error is allowed. When used with an event or state, these terms indicate the exact occurrence or very close occurrence of the event or state.

[0022] As used herein, the terms "pipeline", "tube", "flow channel" and "conduit" are used interchangeably and refer to any type, size or structure of conduits commonly used in the art for transporting liquid and / or gaseous materials and combinations thereof.

[0023] Figure 1 A schematic diagram of a wastewater drying system 1 according to some embodiments of the present invention is shown. The wastewater drying system 1 includes a wastewater source 21, a gas compressor 22, a heat recycling device 23, a washing tower 24, a buffer tank 25, a storage tank 26, a flash drum 30 and one or more drying devices 40. The components of the wastewater drying system 1 can be increased or decreased as needed, and are not limited to Figure 1 The embodiment shown.

[0024] The wastewater source 21 is configured as a device for providing treated wastewater W1 through a pipeline 101. For example, the wastewater source 21 can be a mechanical vapor recompression system (Mechanical Vapor Recompression System) disclosed in Taiwan Invention Patent Application No. 112112254, filed on March 30, 2023, and the entire contents of the above application are incorporated by reference into the present disclosure. Wastewater can be taken out from the distilled gas-water separation barrel of the mechanical vapor recompression system and introduced into the wastewater drying system 1 for a drying procedure. In one embodiment, the wastewater W1 from the wastewater source 21 is in a saturated state and has a first pressure and a first temperature. The first pressure is greater than the gas pressure inside the flash barrel 30, and the first temperature is higher than the temperature of the waste liquid contained inside the flash barrel 30.

[0025] The flash drum 30 is configured to perform a first drying process on the wastewater W1 from the wastewater source 21 to reduce the water content of the wastewater W1. Figure 2 In one embodiment, the flash drum 30 includes a drum body 31, a filter assembly 33, a guide pipe 34, and a liquid level measurement module 37. The drum body 31 generally has a hollow cylindrical structure, including a top wall 310, a bottom wall 311, and a side wall 312. The wastewater inlet 35 is arranged on the top wall 310, the wastewater outlet 36 is arranged on the bottom wall 311, and the steam outlet 32 ​​is arranged on the side wall 312.

[0026] The filter assembly 33 is configured to filter the steam formed by the wastewater inside the barrel body 31. In one embodiment, the filter assembly 33 is arranged inside the barrel body 31 and is located below the steam outlet 32. In one embodiment, the steam outlet 32 ​​is arranged on the side wall 312, close to the upper area of ​​the top wall 310. Therefore, the steam outlet 32 ​​is located between the top wall 310 and the filter assembly 33. The filter assembly 33 may include a plurality of mesh plates, such as mesh plates 331 and 332, which are arranged in the barrel body 31 and are located below the wastewater inlet 35. The mesh plates 331 and 332 each have an annular structure, and their outer periphery abuts against the inner wall surface of the barrel body 31. The mesh plates 331 and 332 also include perforations that allow fluid to pass through, wherein the perforations in the adjacently arranged mesh plates 331 and 332 are staggered with each other.

[0027] The liquid level measurement module 37 is configured to measure the amount of wastewater inside the barrel body 31 to facilitate the operation and control of the wastewater drying system 1. In one embodiment, the liquid level measurement module 37 includes a tube 371, a lower connecting line 372, an upper connecting line 373, an extension line 374, and a detector 375. The tube 371 is arranged adjacent to the barrel body 31 and is located outside the interior of the barrel body 31 for storing wastewater. In some embodiments, the tube 371 is a hollow structure and extends along the height direction of the barrel body 31. In some embodiments, the height of the tube 371 is slightly less than the height of the barrel body 31. The lower connecting line 372 extends in a horizontal direction perpendicular to the longitudinal direction of the tube 371 and is connected to an area near the bottom wall 311 on the side wall 312 of the barrel body 31. The upper connecting line 373 extends in a horizontal direction perpendicular to the longitudinal direction of the tube 371 and is connected to an area near the top wall 310 on the side wall 312 of the barrel body 31. The extension pipeline 374 extends upward from the intersection of the tube 371 and the upper connecting pipeline 373 , and the detector 375 is arranged at the upper end of the extension pipeline 374 .

[0028] When wastewater is stored in the barrel body 31, a portion of the wastewater flows into the tube 371 through the lower connecting line 372. According to the principle of communicating vessels, when the wastewater settles, it is balanced to the same liquid level in the barrel body 31 and the tube 371 regardless of the shape and volume of the barrel body 31 and the tube 371. In addition, if additional liquid is added to the barrel body 31, the liquid will reach a new equal liquid level in the barrel body 31 and the tube 371 again. Through the above working principle, the detector 375 can emit a detection signal 376 to the upper surface of the wastewater located in the tube 371 in the length direction of the tube 371, and analyze the instantaneous wastewater inventory by detecting the echo signal 377 reflected by the wastewater located in the tube 371. In one embodiment, the supply of wastewater from the wastewater source 21 to the flash drum 30 is not continuous, but is determined according to the wastewater inventory in the flash drum 30. Since the water content of the wastewater in the flash drum 30 decreases over time and the wastewater inventory is directly related to the water content of the wastewater, it is possible to determine whether wastewater needs to be supplied to the flash drum 30 from the wastewater source 21 by detecting the wastewater inventory in the flash drum 30 .

[0029] refer to Figure 1 The guide pipe 34 is configured to guide wastewater from outside the barrel body 31 into the barrel body 31, and supply the wastewater to the lower area of ​​the barrel body 31 through the nozzle 341 located below the filter assembly 33. In one embodiment, one end of the guide pipe 34 is located outside the barrel body 31. The guide pipe 34 extends in a vertical direction, passes through the wastewater inlet 35 and the through hole defined in the center of the grid plates 331 and 332, and terminates at the nozzle 341 at its lower end.

[0030] In one embodiment, the flash drum 30 has a working state of a second air pressure, wherein the second air pressure is lower than the first pressure of the wastewater W1. Due to the pressure difference between the first pressure and the first air pressure, after the wastewater W1 enters the flash drum 30, the water contained therein will be instantly converted into a large amount of steam L1 due to its lower boiling point. The steam L1 moves upward, passes through the filter assembly 33, and then is discharged from the flash drum 30 through the steam outlet 32. Therefore, the water content of the preliminary concentrated wastewater W2 stored in the flash drum 30 will be further reduced, so as to facilitate the drying device 40 located downstream for performing the second drying process, and reduce the energy consumption required for its operation.

[0031] In one embodiment, before the preliminary concentrated wastewater W2 is supplied to the drying device 40 for the second drying process, the wastewater drying system 1 further performs a cyclic drying process on the preliminary concentrated wastewater W2 to further reduce its water content. An example of the cyclic drying process is as follows:

[0032] In one embodiment, Figure 1 As shown, the preliminary concentrated wastewater W2 from the flash drum 30 will be sent to the heat recycling device 23 through the pipeline 107, the three-way valve 122 and the pipeline 105. At the same time, the steam L1 of the flash drum 30 discharged from the steam outlet 32 ​​will be sent to the gas compressor 22 through the pipeline 102 for pressurization, and the pressurized high-temperature steam L2 will be sent to the heat recycling device 23 through the pipeline 103. The high-temperature steam L2 and the preliminary concentrated wastewater W2 are heat exchanged in the heat recycling device 23, so that the preliminary concentrated wastewater W2 has an elevated temperature by utilizing the heat energy of the high-temperature steam L2. The elevated temperature is higher than the temperature of the waste liquid contained in the flash drum 30. Then, the preliminary concentrated wastewater W3 with the elevated temperature will be returned to the barrel body 31 through the circulation pipeline 106, the three-way valve 121 and the guide pipe 34. When the preliminary concentrated wastewater W3 with the elevated temperature enters the barrel body 31 , part of the water therein will evaporate into steam L1 to further reduce the water content of the wastewater stored in the barrel body 31 .

[0033] When the above-mentioned cyclic drying process is executed, the three-way valve 121 and the three-way valve 122 are controlled to stop supplying the wastewater W1 from the wastewater source 21 and stop supplying the wastewater to the buffer tank 25. The above-mentioned cyclic drying process can be set to execute a specific time through the program. When the specific time is completed, the three-way valve 122 will be controlled to guide the concentrated wastewater W4 with a water content lower than the threshold to be sent to the buffer tank 25 through the pipeline 108. The concentrated wastewater W4 will be stationary in the buffer tank 25 for a predetermined period of time, and will be sent to the drying device 40 through the pipeline 109 for the second drying process when the drying device 40 is running. On the other hand, when the above-mentioned cyclic drying process is executed, the high-temperature steam L2 passing through the heat recycling device 23 will be converted into a composite gas flow L3 containing steam and condensed water. The composite gas flow L3 will be further sent to the washing tower 24 through the pipeline 104 for cleaning to remove impurities therein, wherein the steam in the composite gas flow L3 can be discharged from the exhaust port 241 to avoid air pollution. In an exemplary embodiment, the scrubber 24 may be used to remove soluble gases, solid particles, liquid particulate matter, harmful gases, organic solvents, acidic and alkaline gases, dust, and other substances.

[0034] It should be understood that the preliminary concentrated wastewater W2 may also be supplied to the drying device 40 for a second drying process (may pass through the buffer tank 25 or not) without passing through the above-mentioned cyclic drying process.

[0035] The drying device 40 is configured to perform a second drying process on the concentrated wastewater W4. Figure 3 , Figure 4 According to some embodiments of the present disclosure, the drying device 40 includes a housing 41, a frame 42, a plurality of rotating pipes (for example, a plurality of rotating pipes 431 and a plurality of rotating pipes 432), a plurality of drying plates 45, a plurality of distribution nozzles 46, a plurality of scraper modules 47 and a collection module 48.

[0036] The housing 41 is configured to accommodate the rotating pipes 431, 432, the drying plate 45, the dispensing nozzle 46, the scraper module 47 and the collecting module 48 of the drying device 40, so as to reduce or avoid the dust from escaping during the drying process. In one embodiment, the housing 41 includes an upper cover 411 and a housing body 412. One side of the upper cover 411 is pivotally mounted on the housing body 412, and can move between a closed position and an open position. The upper cover 411 may include a window 413 to facilitate the operator to observe the internal operation of the drying device 40.

[0037] The plurality of rotating pipes 431 and the plurality of rotating pipes 432 are configured to drive the drying plate 45 to rotate. In an embodiment in which the drying plate 45 is heated by a heat medium in a fluid state, the plurality of rotating pipes 431 and the plurality of rotating pipes 432 are each a hollow tubular structure to allow the heat medium to pass through and be transferred to the drying plate 45. In one embodiment, the plurality of rotating pipes 431 and the plurality of rotating pipes 432 are arranged along an axis R parallel to a horizontal direction, and their long axis direction extends along the axis R. In one embodiment, two rotating pipes 431 are arranged on the left and right sides of the frame 42 in a manner that they can rotate around the axis R, and are located outside the housing 41. A sprocket turntable 444 may be arranged on the outside of the two rotating pipes 431, and the power generated by the driving motor 443 is transmitted to the rotating pipe 432 through the sprocket turntable 442 arranged below and the chain 441 connected between the sprocket turntable 444 and the sprocket turntable 442, so as to drive it to rotate around the axis R.

[0038] Figure 5 The connection relationship between the rotating pipe 431, the rotating pipe 432 and the drying plate 45 is shown. In one embodiment, two of the plurality of rotating pipes 432 ( Figure 5 Only one of them is shown) is connected between the rotating pipe 431 and one drying plate 45, and the remaining rotating pipes 431 are connected between two adjacent drying plates 45. The heat medium (e.g., heat transfer oil) from the heat source 50 passes through the rotating pipe 431 and the rotating pipe 432 in sequence and then enters the hollow structure 450 of the drying plate 45, and then passes through the rotating pipe 432 to enter the hollow structure 450 of the next drying plate 45. In one embodiment, as Figure 4 As shown, the two hot medium passage openings 51, 52 are respectively connected to the outer sides of the two rotating pipes 431 to receive the hot medium from the heat source 50 or to transmit the hot medium to the heat source 50. However, it should be understood that the present application is not limited thereto. In an embodiment where the drying plate 45 is heated by an electronic heating element disposed inside the drying plate 45, the above-mentioned heat source 50 and the two hot medium passage openings 51, 52 can be omitted, and the rotating pipes 431 and 432 can be solid structures.

[0039] Continue to refer Figure 5 In one embodiment, the drying device 40 includes five drying plates 45. The drying plates 45 are arranged at intervals along the axis R and are spaced a certain distance apart from each other. Figure 6 As shown in FIG. 4 , the drying plate 45 is a circular plate with a certain thickness. The two heating surfaces 451 of the drying plate 45 extend perpendicularly to the axis R. Figure 7As shown, the drying plate 45 includes a first shell portion 452, a second shell portion 453 and a partition plate 454. Two heating surfaces 451 are respectively located on the outer sides of the first shell portion 452 and the second shell portion 453. The second shell portion 453 has a vertical annular side wall extending toward the first shell portion 452. The first shell portion 452 is connected to the side wall of the second shell portion 453 to define a hollow structure 450 of the drying plate 45. The partition plate 454 is disposed in the hollow structure 450 and extends parallel to the heating surface 451 of the drying plate 45. The outer periphery of the partition plate 454 is connected to the side wall of the first shell portion 452, wherein the first surface 4541 of the partition plate 454 faces the second shell portion 453, and the second surface 4542 faces the second shell portion 453. The first guide structure 4543 is formed on the first surface 4541, and the second guide structure 4544 is formed on the second surface 4542. In an exemplary embodiment, the first guide structure 4543 and the second guide structure 4544 each have a spiral structure extending around the center C to define a flow channel extending radially outward from the center of the hollow structure 450 in the two spaces.

[0040] In one embodiment, a through hole 4545 is formed on the partition plate 454 adjacent to the outer periphery of the partition plate 454 to allow the heat medium and air to flow from the space adjacent to the first housing portion 452 to the space adjacent to the second housing portion 453. Through the configuration of the through hole 4545, when the through hole 4545 of the drying plate 45 rotates to the upper area, the air in the hollow structure 450 can be discharged in the direction of the heat medium flow to allow the heat medium to completely fill the hollow structure 450.

[0041] During operation, the heat medium enters the space of the hollow structure 450 adjacent to the first shell part 452 through the heat medium inlet 4521 formed at the center of the first shell part 452, and the heat medium in the space is guided by the first guide structure 4543 to fill the entire space. Then, the heat medium flows to the space of the hollow structure 450 adjacent to the second shell part 453 through the through hole 4545, and the heat medium in the space is guided by the second guide structure 4544 to fill the entire space. Subsequently, the heat medium leaves the hollow structure 450 through the heat medium outlet 4531 formed at the center of the second shell part 453. Since the heat medium can fully heat the entire heating surface 451 of the drying plate 45, the dehydration efficiency can be improved.

[0042] Reference again Figure 5 Two elongated dispensing nozzles 46 are respectively disposed adjacent to the upper regions of the two heating surfaces 451 of each drying plate 45. Figure 6 As shown, the dispensing nozzle 46 includes a plurality of openings 461. The openings 461 are configured to distribute the concentrated wastewater W4 (see Figure 1) is distributed to the heating surface 451 of the drying plate 45. There can be a plurality of openings 461, which are arranged along the long axis direction L of the long strip distribution nozzle 46. The openings 461 can have a shape selected from the group consisting of a circle, an ellipse and a polygon. In one embodiment, each opening 461 extends a certain length in the long axis direction L and has a long strip structure.

[0043] The scraper module 47 is configured to remove the sludge that is heated and solidified on the heated surface 451 of the drying plate 45. Figure 5 As shown, the scraper module 47 includes two brackets 471, two scraping elements 472 and an elastic element 473. The two brackets 471 are fixed to the frame 42, respectively arranged relative to the two heating surfaces 451, and used to support the two scraping elements 472. The elastic element 473 is connected between the lower ends of the two scraping elements 472 to apply pressure to the two scraping elements 472 so that the two scraping elements 472 are respectively pressed against the two heating surfaces 451. In one embodiment, as Figure 6 As shown, the two scraping elements 472 are arranged obliquely relative to the horizontal direction to facilitate the sludge removed from the two heating surfaces 451 to slide to the collection module 48 ( Figure 4 ) and then discharged.

[0044] Continue to refer Figure 6 In one embodiment, two distribution nozzles 46 are arranged above the two scraping elements 472, and the concentrated wastewater (not shown) applied on the two heating surfaces 451 by the distribution nozzles 46. Figure 6 4 (shown in FIG. 4 ) moves to the two scraping elements 472 as the drying plate 45 rotates in the rotation direction R1, and is removed by the two scraping elements 472. In another embodiment, the two dispensing nozzles 46 and the two scraping elements 472 are both arranged relative to the lower area of ​​the two heating surfaces 451 of the drying plate 45, but the two dispensing nozzles 46 are arranged upstream of the two scraping elements 472 in the rotation direction R1. With this configuration, the residence time of the concentrated wastewater on the two heating surfaces 451 is extended to further reduce the water content of the concentrated wastewater.

[0045] Reference again Figure 4 , the collecting module 48 is configured to collect the sludge removed from the drying plate 45. In one embodiment, the collecting module 48 includes an elongated slot 481, a driving rod 483, and a driving motor 484. The elongated slot 481 extends parallel to the axis R, and has an upper opening arranged relative to the scraping element 472 to collect the sludge removed from the drying plate 45 by the scraping element 472. The elongated slot 481 also has a sludge outlet 482, adjacent to one end of the elongated slot 481, for discharging the collected sludge. The driving rod 483 extends in the elongated slot 481, and one end thereof is connected to the driving motor 484. Figure 8 As shown, the driving rod 483 may have a spiral outer pattern, and when the driving motor 484 drives it to rotate, the sludge in the elongated groove 481 will be moved to the sludge outlet 482 for discharge. Figure 1 The sludge W6 discharged from the drying device 40 can be discharged into the storage tank 26 through the pipeline 110 for storage, or directly discharged into the container bag for storage.

[0046] In one embodiment, the drying device 40 further includes a tray 49, which is configured to collect the wastewater W7 that flows down from the heating surface of the drying plate 45 or the dispensing nozzle 46 without solidification. In one embodiment, the tray 49 is fluidly connected to the buffer tank 25 through a pipeline 111, and the wastewater W7 is mixed with the concentrated wastewater W4 from the flash drum and then sent to the drying device 40 again for the drying process. With this configuration, the wastewater can be fully dried by the drying device 40.

[0047] In one embodiment, the drying device 40 further includes a pipeline 112, which is fluidically connected to the washing tower 24 via a pump (not shown). During the wastewater drying process, dust or waste gas generated by the wastewater drying in the drying device 40 will be pumped to the washing tower 24 via the pipeline 112 for cleaning and then discharged to avoid air pollution.

[0048] The embodiments of the present application provide a wastewater drying system and a drying device thereof. In the wastewater drying system, wastewater from a wastewater source can first be subjected to a first drying process in a flash drum, and then discharged into a drying device for a second drying process. Since the flash drum fully utilizes the energy of high pressure and high temperature of the wastewater to dry it, the power consumption required for the drying process can be reduced. In embodiments in which the flash drum is combined with devices such as a gas compressor and a heat recycling device, the wastewater in the flash drum can further utilize the thermal energy of steam to perform a cyclic drying process, greatly reducing the water content of the wastewater discharged into the drying device, thereby further reducing the power consumption required for the drying process.

[0049] On the other hand, the drying plate of the drying device is arranged vertically (i.e., perpendicular to the axis of rotation). Compared with the traditional horizontal drum, the vertical drying plate of the present application can dry the sewage in a relatively small space. In an embodiment where both sides of the drying plate are used to perform the drying process and multiple drying plates are arranged in parallel, the amount of sewage that can be processed by ten drying plates per unit time is equivalent to the amount of sewage that can be processed by a traditional single drum in the same unit time. Due to the advantage of the small size of the drying plate, the gas compressor, heat recycling device, washing tower, buffer tank, storage tank, flash drum, two drying devices, heat source, related pipelines and control equipment of the wastewater drying system using the drying plate of the present application can be accommodated in an area of ​​the size of a standard container at the same time, thereby greatly reducing the land area required to set up the wastewater drying system.

[0050] In general, compared with the process of using a traditional dryer to directly dry wastewater supplied from a wastewater source, the wastewater drying system of the present application has technical advantages such as low energy consumption, small footprint, and environmental friendliness.

[0051] The above-mentioned structures of several embodiments are summarized so that those skilled in the art can better understand various aspects of the embodiments of the present application. It should be understood by those skilled in the art that other processes and structures can be designed or modified according to the content of the present application to achieve the same purpose and / or achieve the same advantages of the embodiments mentioned herein. It should also be recognized by those skilled in the art that these equivalent constructions should not deviate from the spirit and scope of the embodiments of the present application, and various changes, substitutions and modifications can be made to the contents of this article without departing from the spirit and scope of the embodiments of the present application.

[0052] Description of the accompanying drawings

[0053] 1: Wastewater drying system\

[0054] 21: Sources of wastewater

[0055] 22: Gas compressor

[0056] 23: Heat recycling device

[0057] 24: Scrubber

[0058] 25: Buffer tank

[0059] 26: Storage slot

[0060] 30: Flash Tank

[0061] 31: Barrel body

[0062] 32: Steam outlet

[0063] 33: Filtering components

[0064] 34: Guide tube

[0065] 35: Wastewater inlet

[0066] 36: Wastewater outlet

[0067] 37: Liquid level measurement module

[0068] 40: Drying device

[0069] 41: Shell

[0070] 42: Rack

[0071] 45: Drying plate

[0072] 46: Dispensing nozzle

[0073] 47: Scraper module

[0074] 48: Collection Module

[0075] 49: Tray

[0076] 50: Heat source

[0077] 51: Hot medium channel opening

[0078] 52: Hot medium channel opening

[0079] 101,102,103,104,105,107,108,109,110,111,112: pipeline

[0080] 106: Circulation pipeline

[0081] 241: Exhaust port

[0082] 121,122: Three-way valve

[0083] 310: Top wall

[0084] 311: Bottom wall

[0085] 312: Sidewall

[0086] 331: Grid Panel

[0087] 332: Grid Panel

[0088] 341: Nozzle

[0089] 371: Tube

[0090] 372: Lower connecting pipeline

[0091] 373: Upper connection pipeline

[0092] 374: Extended pipeline

[0093] 375: Detector

[0094] 376: Detection signal

[0095] 377: Echo signal

[0096] 411: Upper cover

[0097] 412: Shell body

[0098] 413: Window

[0099] 431: Rotating Pipe

[0100] 432: Rotating Pipe

[0101] 441: Chain

[0102] 442: Sprocket turntable

[0103] 443: Drive motor

[0104] 444: Sprocket turntable

[0105] 450: Hollow structure

[0106] 451: Heating Surface

[0107] 452: First shell part

[0108] 453: Second shell

[0109] 454: Spacer

[0110] 461: Opening

[0111] 471: Bracket

[0112] 472: Scraping element

[0113] 473: Elastic element

[0114] 481: Long slot

[0115] 482: Sludge outlet

[0116] 483: Driving rod

[0117] 484: Drive motor

[0118] 4521: Hot media inlet

[0119] 4531: Hot medium outlet

[0120] 4541: First surface

[0121] 4542: Second surface

[0122] 4543: First guide structure

[0123] 4544: Second guide structure

[0124] 4545: Through hole

[0125] C: Center

[0126] L: Long axis

[0127] L1: Steam

[0128] L2: High temperature steam

[0129] L3: Composite airflow

[0130] R: Axis

[0131] R1: Rotation direction

[0132] W1, W2, W3, W7: Wastewater

[0133] W2: Preliminary concentrated wastewater

[0134] W4: Concentrated wastewater

Claims

1. A drying device, characterized in that: include: a drying plate configured to rotate about an axis parallel to the horizontal direction, the drying plate including at least one heating surface extending perpendicular to the axis; a heat source configured to generate thermal energy and heat the drying plate; a dispensing nozzle including at least one opening configured to dispense concentrated wastewater onto the heated surface of the drying tray; as well as A scraping element is disposed opposite to the heating surface and is configured to remove sludge solidified by heating on the heating surface of the drying plate.

2. The drying device according to claim 1, characterized in that: The drying plate is a circular plate with a certain thickness and comprises two heating surfaces extending perpendicularly to the axis. The drying device comprises two dispensing nozzles respectively arranged on the two heating surfaces and two scraping elements respectively arranged on the two heating surfaces.

3. The drying device according to claim 1, characterized in that: The invention further comprises a rotating pipe connected to the drying plate, wherein the rotating pipe extends along the axis, wherein the drying plate is a hollow structure, and the heat source provides heating liquid to the interior of the drying plate through the rotating pipe to heat the heating surface.

4. The drying device according to claim 3, characterized in that: The invention comprises a plurality of drying plates and a plurality of rotating pipes, wherein the plurality of drying plates are arranged at intervals along the axis and are spaced apart from each other by a certain distance, and the plurality of rotating pipes connect the plurality of drying plates to supply the heating liquid from the heat source to each of the drying plates in sequence.

5. The drying device according to claim 3, characterized in that: The hollow structure of the drying plate further comprises a partition plate parallel to the heating surface, and the first flow channel and the second flow channel are defined by the partition plate in the hollow structure, wherein the partition plate comprises a through hole connecting the first flow channel and the second flow channel.

6. The drying device according to claim 1, characterized in that: The invention further comprises an elastic element connected to the scraping element and configured to apply pressure to the scraping element so that the scraping element is pressed against the heating surface.

7. The drying device according to any one of claims 1 to 6, characterized in that: The distribution nozzle includes a plurality of openings facing the heating surface and configured to supply the concentrated wastewater to the heating surface, the openings having a shape selected from the group consisting of a circle, an ellipse, a polygon, and a strip.

8. The drying device according to any one of claims 1 to 6, characterized in that: The dispensing nozzle is arranged upstream in the direction of rotation of the drying disc relative to the scraper element.

9. The drying device according to any one of claims 1 to 6, characterized in that: The invention further comprises a tray disposed below the drying tray, wherein the tray is configured to recover the concentrated wastewater that is not solidified from the heating surface.

10. A wastewater drying system, characterized in that: include: The drying device according to any one of claims 1 to 9; as well as A flash drum is fluidically connected to the drying device, the flash drum is configured to receive wastewater and convert the wastewater into the concentrated wastewater through a first drying process, and the drying device is configured to receive the concentrated wastewater from the flash drum and convert the concentrated wastewater into the sludge through a second drying process.

11. The wastewater drying system according to claim 10, characterized in that: The flash drum has a first air pressure, the wastewater has a second air pressure, and after the wastewater enters the flash drum, due to the difference between the first air pressure and the second air pressure, it is converted into steam and the wastewater is preliminarily concentrated in the flash drum; a gas compressor fluidly connected to the flash drum and configured to pressurize steam from the flash drum to form pressurized steam; a heat recycling device configured to receive the pressurized steam from the gas compressor and the preliminary concentrated wastewater from the flash drum, wherein the pressurized steam and the preliminary concentrated wastewater are heat-exchanged in the heat recycling device; as well as A circulation pipeline fluidly connects the heat recycling device and the flash drum, and introduces the heated preliminary concentrated wastewater from the heat recycling device into the flash drum, where the preliminary concentrated wastewater is converted into the concentrated wastewater.

12. The wastewater drying system according to claim 11, characterized in that: The invention further comprises a washing tower, which is fluidly connected to the heat recovery device to receive and clean the pressurized steam from the gas compressor or the condensed water converted from the pressurized steam from the gas compressor.

13. The wastewater drying system according to claim 12, characterized in that: The scrubber is further fluidly connected to the drying device to receive and clean the exhaust gas from the drying device.

14. The wastewater drying system according to claim 10, characterized in that: The invention further comprises a buffer tank, wherein the buffer tank is fluidically connected between the flash drum and the drying device, wherein the concentrated wastewater from the flash drum is temporarily stored in the buffer tank and distributed to the distribution nozzle of the drying device.

15. The wastewater drying system according to claim 10, characterized in that: The flash drum further comprises: A barrel of main body; a filter assembly disposed in the upper area of ​​the barrel body, the filter assembly comprising a plurality of mesh plates stacked in sequence, each of the plurality of mesh plates comprising a plurality of perforations, and the perforations of two adjacent mesh plates being arranged alternately; and A steam outlet is arranged above the filter assembly, and the steam in the barrel body first passes through the filter assembly and then leaves the flash barrel through the steam outlet.

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