Sludge flash evaporation drying equipment for coupling mechanical dehydration with waste heat flue gas

Abstract

The utility model provides sludge flash drying equipment for mechanically dewatering and coupling waste heat flue gas. The sludge flash drying equipment comprises a mechanical dewatering device and a flash drying device, the mechanical dehydration device comprises a first shell, a second shell and a third shell, the centrifugal barrel is arranged in the first shell; a sewage storage tank is formed between the first shell and the centrifugal cylinder; a plurality of drainage holes are formed in the cylinder wall of the centrifugal cylinder; the first driving device is used for driving the centrifugal barrel to rotate; the flash evaporation drying device comprises a second shell, wherein a flue gas inlet is formed in the side wall of the second shell; the centrifugal atomizing disc is arranged in the second shell; the centrifugal atomizing disc is arranged above the flue gas inlet; the second driving device is used for driving the centrifugal atomizing disc to rotate; and a discharge port at the lower end of the centrifugal cylinder is communicated with a feed port at the upper end of the flash drying device. According to the utility model, sludge centrifugal mechanical dehydration and waste heat flue gas flash evaporation drying are coupled, so that the device is particularly suitable for drying treatment of sludge with high water content of more than 90%, and is high in drying efficiency, lower in energy consumption and good in economical efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge treatment, and more specifically, relates to sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas. Background Art

[0002] With the advancement of urbanization and industrialization, my country has built large-scale sewage treatment plants. However, sludge treatment and disposal has been neglected, and the biggest bottleneck of sludge disposal is drying and reduction. According to statistics, there will be 3,882 urban sewage treatment plants in my country in 2023, with an annual sewage treatment capacity of 62.6 billion cubic meters, equivalent to about 71.25 million tons of wet sludge with a moisture content of 90%.

[0003] At present, the commonly used sludge treatment technologies in my country include sludge concentration technology, sludge dewatering technology, sludge anaerobic digestion technology, high-temperature aerobic fermentation technology and sludge thermal drying technology. Drying technology is an important link, and the main methods include natural drying, thermal drying and high-drying dehydration. The purpose of sludge thermal drying is to reduce the volume and weight of sludge by reducing the water content in the sludge, thereby reducing the transportation and disposal costs and improving the resource utilization rate of sludge. Combined with existing facilities, sludge can be treated and disposed of by a variety of combinations such as anaerobic digestion / aerobic fermentation + land utilization, drying incineration + building materials utilization, and cement kiln coordinated utilization. Among them, sludge drying and incineration technology, as a sludge harmless treatment technology, is one of the main sludge treatment methods in the world today because of its high efficiency, wide application and green environmental protection. Since the water content of sludge in sewage treatment plants is as high as 93%-98% after concentration, further treatment is required for better incineration and utilization. To efficiently incinerate sludge, drying pretreatment is the key to sludge treatment and disposal at present. Drying pretreatment can increase the solid content of sludge, increase its calorific value, and thus improve the sludge incineration efficiency.

[0004] In the prior art, Chinese patent CN205115263U discloses a sludge drying device using low-temperature flue gas, which uses low-temperature flue gas as a heating medium and can control the particle size of the ejected particles by adjusting the rotation speed of the atomizing disk to adapt to high-viscosity sludge. However, it only uses low-temperature flue gas to dry high-water sludge, which is difficult to adapt to sludge with particularly high water content (>90%). In order to effectively improve the sludge incineration efficiency, it is necessary to further reduce the sludge water content. Utility Model Content

[0005] The utility model aims to provide a sludge flash drying equipment with mechanical dehydration coupled with waste heat flue gas, which organically couples the centrifugal mechanical dehydration of sludge with the flash drying of waste heat flue gas, and is particularly suitable for drying sludge with a high moisture content of more than 90%. It has rapid heat and mass transfer, high drying efficiency, low energy consumption and good economy.

[0006] To achieve the above-mentioned purpose, the utility model provides a sludge flash drying device for mechanical dehydration coupled with waste heat flue gas, comprising a mechanical dehydration device and a flash drying device;

[0007] The mechanical dehydration device comprises:

[0008] A first shell, a side wall of which is provided with a sewage outlet;

[0009] A centrifugal cylinder is disposed in the first shell; a sewage storage tank is formed between the first shell and the centrifugal cylinder; a plurality of drainage holes are provided on the cylinder wall of the centrifugal cylinder; and,

[0010] A first driving device, used for driving the centrifugal cylinder to rotate;

[0011] The flash drying device comprises:

[0012] A second shell having a side wall provided with a smoke inlet;

[0013] A centrifugal atomizing disk is disposed in the second shell; the centrifugal atomizing disk is disposed above the smoke inlet; and,

[0014] A second driving device, used for driving the centrifugal atomizing disk to rotate;

[0015] The lower discharge port of the centrifugal cylinder is communicated with the upper feed port of the flash drying device.

[0016] Furthermore, the first driving device comprises:

[0017] A connecting rod, one end of which is connected to the centrifugal cylinder;

[0018] A first rotating shaft connected to the other end of the connecting rod; and

[0019] The first motor is used to drive the first rotating shaft to rotate.

[0020] Furthermore, the first driving device further includes a first belt, and the rotation shaft of the first motor and the first rotation shaft are transmitted through the first belt.

[0021] Furthermore, a conical sludge disperser is connected to the first rotating shaft.

[0022] Furthermore, the second driving device includes a second rotating shaft and a second motor for driving the second rotating shaft to rotate, and one end of the second rotating shaft is connected to the centrifugal atomizing disk.

[0023] Furthermore, the second rotating shaft is also connected to a lift fan for providing lift for the waste heat flue gas to move upward.

[0024] Furthermore, the second rotating shaft is also connected to a symmetrically arranged scraper, and the scraper abuts against the inner side wall of the second shell.

[0025] Furthermore, a plurality of spaced blades are provided on a connecting rod connecting two symmetrically arranged scrapers.

[0026] Furthermore, the second driving device also includes a second belt, and the rotation shaft of the second motor and the second rotation shaft are driven by the second belt.

[0027] Furthermore, it also includes:

[0028] A top cover, which is arranged above the mechanical dehydration device; the top cover is provided with a mounting hole for the first rotating shaft to pass through, and the top cover is also provided with an outlet for the dried sludge and waste heat flue gas;

[0029] a cyclone separator in communication with the discharge port;

[0030] an exhaust gas treatment device, which is connected to the upper exhaust port of the cyclone separator; and

[0031] The dry sludge storage bin is communicated with the lower sludge discharge port of the cyclone separator.

[0032] Furthermore, it also includes a sludge conveying device, and the sludge conveying device includes:

[0033] Wet sludge storage silos;

[0034] A feed hopper, used for receiving wet sludge discharged from the wet sludge storage bin;

[0035] An auger conveyor, whose feed port is connected to the discharge port of the feed hopper; the discharge port of the auger conveyor is connected to the feed port of the mechanical dehydration device; and,

[0036] The feeding motor is used to drive the auger conveyor to convey the wet sludge.

[0037] Furthermore, an air distributor is provided in the smoke inlet.

[0038] Furthermore, a base bracket is provided on the lower side of the second shell.

[0039] Furthermore, the base bracket is fixed to the ground by means of ground bolt nuts.

[0040] Compared with the prior art, the utility model has the following technical effects:

[0041] The utility model is a sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas, which includes a mechanical dehydration device and a flash drying device. The mechanical dehydration device can be used to pre-treat concentrated sludge with a high moisture content of more than 90% from a sewage treatment plant by centrifugal dehydration, and the moisture content of the concentrated sludge can be reduced to less than 60%. After that, the flash drying device can be used to further reduce the moisture content of the sludge to less than 25% to facilitate subsequent incineration disposal. The utility model organically couples sludge centrifugal mechanical dehydration and waste heat flue gas flash drying, and is particularly suitable for drying concentrated sludge with a high moisture content of more than 90%, and efficiently flash evaporating and drying it into dried sludge particles with a moisture content of less than 25%. During the flash drying reaction process, heat and mass transfer are rapid, the drying efficiency is high, the energy consumption is low, and the economy is good. The equipment is also easy to connect to existing sludge disposal facilities, and is very suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1 A schematic diagram of the overall structure of a sludge flash drying device for mechanical dehydration coupled with waste heat flue gas provided in an embodiment of the utility model;

[0044] Figure 2 for Figure 1 A schematic diagram of the top view of the structure of the medium sludge disperser;

[0045] Figure 3 for Figure 1 Schematic diagram of the top view of the connection between the middle connecting rod and the centrifugal cylinder.

[0046] Among them, the reference numerals in the figure are:

[0047] 1-wet sludge storage bin; 2-feeding motor; 3-feeding hopper; 4-auger conveyor; 5-top cover; 6-first motor; 7-first belt; 8-exhaust treatment device; 9-first rotating shaft; 10-cyclone separator; 11-sludge disperser; 12-sewage storage tank; 13-connecting rod; 14-centrifugal cylinder; 15-dry sludge storage bin; 16-sewage outlet; 17-flue gas inlet; 18-centrifugal atomizing disc; 19-scraper; 20-lift fan; 21-air distributor; 22-base bracket; 23-second rotating shaft; 24-second belt; 25-second motor; 26-ground bolt nut. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] In the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0050] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0051] It should be understood that the terms "length", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0052] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0053] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present invention, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0054] See also Figure 1-Figure 3 Now, a sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas provided by an embodiment of the utility model is described.

[0055] In one embodiment, a sludge flash drying device for mechanical dehydration coupled with waste heat flue gas of the utility model embodiment includes a mechanical dehydration device and a flash drying device.

[0056] The mechanical dehydration device includes a first housing, a centrifugal drum 14 and a first driving device. The side wall of the first housing is provided with a sewage outlet 16, the centrifugal drum 14 is arranged in the first housing, and a sewage storage tank 12 is formed between the first housing and the centrifugal drum 14; a plurality of drainage holes are provided on the wall of the centrifugal drum 14, and the drainage holes are evenly distributed on the centrifugal drum 14, and the drainage holes can be fine holes with a hole diameter of 0.2 to 0.5 mm. The first driving device is used to drive the centrifugal drum 14 to rotate.

[0057] The flash drying device comprises a second shell, a centrifugal atomizing disk 18 and a second driving device. A flue gas inlet 17 is provided on the side wall of the second shell, the centrifugal atomizing disk 18 is arranged in the second shell, and the centrifugal atomizing disk 18 is arranged above the flue gas inlet 17. The second driving device is used to drive the centrifugal atomizing disk 18 to rotate. The lower end discharge port of the centrifugal cylinder 14 is connected to the upper end feed port of the flash drying device.

[0058] When the sludge flash drying equipment of the mechanical dehydration coupled with waste heat flue gas of the embodiment of the utility model is in use, the concentrated sludge with a high moisture content of more than 90% enters the centrifugal drum 14 of the mechanical dehydration device. Through the high-speed rotation of the centrifugal drum 14, the concentrated sludge with a high moisture content can be pre-treated by centrifugal dehydration to reduce the moisture content of the concentrated sludge to less than 60%. Afterwards, the mechanically dehydrated sludge is discharged from the bottom of the centrifugal drum 14 into the flash drying device, and the centrifugal atomization disk 18 performs high-speed shear atomization on the mechanically dehydrated sludge. The atomized sludge exchanges heat with the waste heat flue gas entering from the flue gas inlet 17. Under the convection flash drying effect of the waste heat flue gas from the sludge incineration, the moisture content of the sludge is further reduced to less than 25%, so as to facilitate subsequent incineration disposal. The dry sludge after drying treatment is taken out from the top of the centrifugal drum 14 by the waste heat flue gas for subsequent sludge and flue gas separation treatment.

[0059] Furthermore, the first driving device of this embodiment includes a connecting rod 13, a first rotating shaft 9 and a first motor 6. One end of the connecting rod 13 is connected to the centrifugal cylinder 14; the first rotating shaft 9 is connected to the other end of the connecting rod 13, and the first motor 6 is used to drive the first rotating shaft 9 to rotate. In this embodiment, three connecting rods 13 are provided, all of which are connected to the centrifugal cylinder 14, and the angles between the two are 120 degrees. Figure 3 shown.

[0060] Furthermore, the first driving device of the present embodiment further comprises a first belt 7, and the shaft of the first motor 6 and the first shaft 9 are driven by the first belt 7. In this way, the first motor 6 and the first shaft 9 are driven by a belt. Compared with the hard connection method of direct connection, the belt drive connection method of the present embodiment can effectively absorb shock and vibration, thereby reducing mechanical vibration and operating noise, which is conducive to extending the service life of the equipment and improving the comfort of workers. In addition, the use of belt drive can achieve overload protection, facilitate the change of transmission ratio, have high design flexibility, and be easy to install and maintain.

[0061] Furthermore, the first rotating shaft 9 of this embodiment is connected to a conical sludge disperser 11, such as Figure 2 As shown, the sludge disperser 11 is a conical thin shell structure. The wet sludge coming from the top of the centrifugal drum 14 is evenly dispersed by the sludge disperser 11 onto the inner wall of the centrifugal drum 14, which is beneficial to the rapid dehydration of the wet sludge.

[0062] Furthermore, the second driving device of this embodiment includes a second rotating shaft 23 and a second motor 25 for driving the second rotating shaft 23 to rotate, and one end of the second rotating shaft 23 is connected to the centrifugal atomizing disk 18. The second rotating shaft 23 is driven to rotate by the second motor 25, and then the centrifugal atomizing disk 18 is driven to rotate, thereby realizing shear atomization of the sludge.

[0063] Furthermore, a lift fan 20 is connected to the second rotating shaft 23 of the present embodiment. The lift fan 20 is used to provide upward lift to the waste heat flue gas entering from the flue gas inlet 17, and to carry out the dried sludge particles through the upward moving waste heat flue gas.

[0064] Furthermore, the second rotating shaft 23 of this embodiment is also connected to a symmetrically arranged scraper 19, which abuts against the inner wall of the second shell, and is arranged above the smoke inlet 17. In this way, when the second rotating shaft 23 rotates, the scraper 19 can be driven to scrape off the sludge adhering to the inner wall of the second shell, thereby preventing the sludge from adhering to the inner wall of the second shell.

[0065] Furthermore, in this embodiment, a plurality of blades (not shown in the figure) arranged at intervals are provided on the connecting rod connected to the two symmetrically arranged scrapers 19, so that the large sludge particles falling from the second housing and the centrifugal atomizing disk 18 can be crushed by the blades, which is conducive to further drying of the sludge particles by the subsequent waste heat flue gas and carrying them out with the waste heat flue gas. The scrapers 19 and the connecting rods connecting the scrapers 19 can be arranged in a plurality of central symmetric arrangements.

[0066] Furthermore, the second driving device of the present embodiment further includes a second belt 24, and the shaft of the second motor 25 and the second shaft 23 are driven by the second belt 24. In this way, the second motor 25 and the second shaft 23 are driven by a belt. Compared with the hard connection method of direct connection, the belt drive connection method of the present embodiment can effectively absorb shock and vibration, thereby reducing mechanical vibration and operating noise, which is conducive to extending the service life of the equipment and improving the comfort of workers. In addition, the use of belt drive can achieve overload protection, facilitate the change of transmission ratio, have high design flexibility, and be easy to install and maintain.

[0067] Furthermore, the sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas of the present embodiment further includes a top cover 5, a cyclone separator 10, an exhaust gas treatment device 8 and a dry sludge storage bin 15. The top cover 5 is arranged above the mechanical dehydration device; a mounting hole for the first rotating shaft 9 to pass through is provided on the top cover 5, and an exhaust port for dried sludge and waste heat flue gas is also provided on the top cover 5; the cyclone separator 10 is connected to the exhaust port for dried sludge and waste heat flue gas; the exhaust gas treatment device 8 is connected to the upper exhaust port of the cyclone separator 10, for treating the separated waste heat flue gas; the dry sludge storage bin 15 is connected to the lower mud discharge port of the cyclone separator 10, for storing the separated dry sludge. The dehydrated dried sludge and waste heat flue gas are separated under the action of the cyclone separator 10 , and the waste heat flue gas is discharged to the tail gas treatment device 8 , while the dried sludge with a moisture content below 25% is stored in the dry sludge storage bin 15 after passing through the cyclone separator 10 .

[0068] Furthermore, a mechanical dehydration coupled waste heat flue gas sludge flash drying equipment of this embodiment also includes a sludge conveying device, which includes a wet sludge storage bin 1, a feed hopper 3, an auger conveyor 4 and a feed motor 2. The feed hopper 3 is used to receive the wet sludge discharged from the wet sludge storage bin 1; the feed port of the auger conveyor 4 is connected to the discharge port of the feed hopper 3; the discharge port of the auger conveyor 4 is connected to the feed port of the mechanical dehydration device; the feed motor 2 is used to drive the auger conveyor 4 to convey the wet sludge. Concentrated sludge with a high moisture content of more than 90% from the sewage treatment plant is stored in the wet sludge storage bin 1. When the sludge flash drying equipment is started, the concentrated sludge is directly sent to the sludge centrifugal mechanical dehydration device through the sludge conveying device for mechanical dehydration.

[0069] Furthermore, a blower 21 is provided in the flue gas inlet 17 of the present embodiment, so that the waste heat flue gas generated after the sludge incineration passes through the flue gas inlet 17 and the blower 21 and enters the waste heat flue gas flash drying device.

[0070] Furthermore, a base support 22 is provided on the lower side of the second housing of the present embodiment for supporting the entire device. Furthermore, the base support 22 is firmly fixed to the ground through a ground bolt nut 26 .

[0071] The specific working process of a sludge flash drying device for mechanical dehydration coupled with waste heat flue gas in this embodiment is as follows:

[0072] When the equipment is turned on, the first motor 6 drives the first rotating shaft 9, the sludge disperser 11, the connecting rod 13 and the centrifugal cylinder 14 to rotate through the first belt 7, and the second motor 25 drives the second rotating shaft 23, the lift fan 20, the centrifugal atomizing disk 18 and the scraper 19 to rotate through the second belt 24. Then, the concentrated sludge with a high moisture content of more than 90% directly enters the centrifugal cylinder 14 in the sludge centrifugal mechanical dewatering device from the outlet of the auger conveyor 4 through the sludge conveying device. During the descent process, the concentrated sludge first falls on the sludge disperser 11, and then the concentrated sludge is dispersed on the inner wall of the centrifugal cylinder 14. Under the centrifugal action of the centrifugal cylinder 14, part of the water in the concentrated sludge is thrown out, and enters the sewage storage tank 12 through the fine drainage holes on the wall of the centrifugal cylinder 14, and then is discharged through the sewage outlet 16 for purification. At the same time, the sludge after mechanical removal pretreatment moves downward along the inner wall of the centrifugal cylinder 14 under its own gravity until it contacts the centrifugal atomizing disk 18 and the scraper 19 in the waste heat flue gas flash drying device. At this time, the sludge moisture content has been reduced to below 60%. The sludge enters the centrifugal atomizing disk 18 and is atomized and cut into fine droplet particles by the centrifugal atomizing disk 18, and then fully contacts with the waste heat flue gas and flash evaporation and evaporation, and at the same time, under the lift provided by the lift fan 20, it moves upward until it reaches the top cover 5, and enters the cyclone separator 10 from the side discharge port of the top cover 5, and is separated into waste heat flue gas and dried sludge particles in the cyclone separator 10. The waste heat flue gas is discharged to the exhaust gas treatment device 8, and the dried sludge with a moisture content below 25% is separated by the cyclone separator 10 and stored in the dry sludge storage bin 15.

[0073] It should be noted that during the operation of the equipment, the sludge conveying device operates intermittently at intervals of 5 to 10 seconds, while the sludge centrifugal mechanical dehydration device and the waste heat flue gas flash drying device both maintain continuous operation. The purpose is to allow the dried sludge particles that have been flash dried to pass through the sludge disperser 11 to the upper cover 5 along with the waste heat flue gas during the intervals when the sludge conveying device is not in operation. In this process, the sludge disperser 11 acts as a particle separator, which can achieve control of the particle size of the dried sludge particles.

[0074] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A sludge flash drying equipment with mechanical dehydration coupled with waste heat flue gas, characterized in that: It includes mechanical dehydration device and flash drying device; The mechanical dehydration device comprises: A first shell, a side wall of which is provided with a sewage outlet; A centrifugal cylinder is disposed in the first shell; a sewage storage tank is formed between the first shell and the centrifugal cylinder; a plurality of drainage holes are provided on the cylinder wall of the centrifugal cylinder; and, A first driving device, used for driving the centrifugal cylinder to rotate; The flash drying device comprises: A second shell having a side wall provided with a smoke inlet; A centrifugal atomizing disk is disposed in the second shell; the centrifugal atomizing disk is disposed above the smoke inlet; and, A second driving device, used for driving the centrifugal atomizing disk to rotate; The lower discharge port of the centrifugal cylinder is communicated with the upper feed port of the flash drying device.

2. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas according to claim 1, characterized in that: The first driving device comprises: A connecting rod, one end of which is connected to the centrifugal cylinder; A first rotating shaft connected to the other end of the connecting rod; and The first motor is used to drive the first rotating shaft to rotate.

3. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas as claimed in claim 2, characterized in that: The first driving device further comprises a first belt, and the first rotating shaft and the first rotating shaft are driven by the first belt; and / or a conical sludge disperser is connected to the first rotating shaft.

4. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas according to claim 1, characterized in that: The second driving device includes a second rotating shaft and a second motor for driving the second rotating shaft to rotate, and one end of the second rotating shaft is connected to the centrifugal atomizing disk.

5. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas as claimed in claim 4, characterized in that: The second rotating shaft is also connected to a lift fan for providing lift for the waste heat flue gas to move upward; and / or the second rotating shaft is also connected to symmetrically arranged scrapers, which abut against the inner side wall of the second shell.

6. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas according to claim 4, characterized in that: The second driving device further comprises a second belt, and the rotation shaft of the second motor and the second rotation shaft are driven by the second belt.

7. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas as claimed in claim 2, characterized in that: Also includes: A top cover, which is arranged above the mechanical dehydration device; the top cover is provided with a mounting hole for the first rotating shaft to pass through, and the top cover is also provided with an outlet for the dried sludge and waste heat flue gas; a cyclone separator in communication with the discharge port; an exhaust gas treatment device, which is connected to the upper exhaust port of the cyclone separator; and The dry sludge storage bin is communicated with the lower sludge discharge port of the cyclone separator.

8. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas according to claim 1, characterized in that: It also includes a sludge conveying device, which includes: Wet sludge storage silos; A feed hopper, used for receiving wet sludge discharged from the wet sludge storage bin; An auger conveyor, whose feed port is connected to the discharge port of the feed hopper; the discharge port of the auger conveyor is connected to the feed port of the mechanical dehydration device; and, The feeding motor is used to drive the auger conveyor to convey the wet sludge.

9. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas according to claim 1, characterized in that: An air distributor is arranged in the smoke inlet.

10. The sludge flash drying equipment for mechanical dehydration coupled with waste heat flue gas according to any one of claims 1 to 9, characterized in that: A base bracket is provided on the lower side of the second shell.

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