Wet material auxiliary drying equipment
By designing a wet material auxiliary drying equipment that combines a spiral circulation conveyor, exhaust gas discharge pipe and hot air duct, efficient drying of wet material and purification of exhaust gas is achieved, solving the problems of low drying efficiency of wet material and insufficient heat energy utilization in the prior art, and reducing production costs.
Patent Information
- Application Number
- CN202422071969.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-26
AI Technical Summary
During the existing sand processing process, the drying efficiency of wet materials is low, the heat energy utilization is insufficient, and the cost of the exhaust gas purification system is high, resulting in an increase in processing costs.
Design a wet material auxiliary drying equipment, using a combination of spiral circulation conveyor, exhaust gas discharge pipe and hot air duct, pre-drying the wet material through the hot air duct, and use the exhaust gas discharge pipe to dry the heat in the exhaust gas for wet material. At the same time, use the wet material to purify the exhaust gas, reducing dependence on conventional air purification systems.
It improves the drying efficiency and thermal energy utilization rate of wet materials, reduces the cost of exhaust gas purification, reduces the demand for high-cost air purification systems, and reduces production costs.
Smart Images
Figure CN223138225U_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of sand processing, and specifically relates to a wet material auxiliary drying device. Background Art
[0002] During the sand production process, wet materials need to be dried. In the prior art, the wet materials are placed in a hopper, and the screw conveyor at the bottom of the hopper transports the wet materials to a drum dryer. One end of the drum of the dryer is connected to a hot blast stove, and the hot air from the hot blast stove directly enters the dryer to contact the rolling sand for drying. Then the dried sand is discharged from the discharge port of the dryer, and the hot air tail gas and moisture need to be treated through a complete set of air purification systems, including adsorption towers, desorption towers, atomizers, dust collectors, flocculation precipitation devices, etc. The dust collector generally uses a bag filter, and generally 300 - 500 are required for the whole system, costing at least 200,000 - 300,000. This leads to an increase in the sand processing cost, and the existing wet material drying system for sand processing has insufficient utilization of the heat energy of the hot blast stove, reducing the sand drying efficiency. Summary of the Invention
[0003] In view of the above problems, the present invention provides a wet material auxiliary drying device, which can fully utilize waste heat to dry wet sand materials, and at the same time can purify the tail gas of the hot blast stove. It can not only improve the heat energy utilization rate, but also greatly reduce the tail gas purification cost, with good energy-saving effects.
[0004] To achieve the above object, the technical solution adopted by the present invention is:
[0005] A wet material auxiliary drying device includes a box body for containing wet sand materials. Inside the box body, from top to bottom, there are: a screw circulation conveyor, a tail gas discharge pipe, a hot air pipe, and a screen; a screw conveyor is provided at the bottom outlet of the box body; exhaust holes are provided at the bottom of the tail gas discharge pipe; blanking cylinders inserted into the wet materials are distributed at the bottom of the screw circulation conveyor; one end of the hot air pipe is connected to a hot air source; the inlet of the tail gas discharge pipe is connected to the pipe for discharging the tail gas of the hot air source.
[0006] Compared with the prior art, the beneficial effects of the present invention are:
[0007] This device is used in the pre-drying process of the wet sand material drying system. It can perform auxiliary drying before the wet materials enter the dryer, removing a part of the moisture in advance. It not only has high drying efficiency, but also has high utilization efficiency of the waste heat of the hot air. It does not need to use a conventional complete set of high-cost air purification systems to purify the tail gas. The tail gas can not only be purified through the wet materials, but also play a role in drying the wet materials, greatly reducing the processing cost of the wet materials.
[0008] The blanking cylinder is inserted into the sand, located between adjacent tail gas discharge pipes. Due to the obstruction of the tail gas discharge pipes, the sand directly above the tail gas discharge pipes descends slowly, while the sand between adjacent tail gas discharge pipes dries quickly, has a high downward flow frequency, and forms a high local cavity frequency. Therefore, wet material can quickly fall from the first blanking cylinder into the local cavity to fill it, thus making full use of the characteristics of high drying speed and high flow speed in this area and improving the drying efficiency of the wet material. The second blanking cylinder is located above the required lowest sand surface and directly above the tail gas discharge pipes. When the sand surface descends, the wet material in the second blanking cylinder will fill this position, thereby ensuring the overall height of the sand surface remains stable. Only when the sand surface height is stable can a stable efficiency of tail gas purification be achieved.
[0009] While the tail gas enters the wet sand through the tail gas discharge pipes and is absorbed and purified, the tail gas will rise and enter the spiral circulation conveyor through the blanking cylinder, drying the sand circulating in the spiral circulation conveyor and improving the drying effect.
[0010] As a further improvement of the above solution, the hot air discharged from the hot air source enters the hot air pipe, heats the hot air pipe, then enters other equipment that requires heat energy through a pipeline, and finally enters the dust collector for primary filtration, and then returns to the tail gas discharge pipe through a pipeline and is directly discharged into the wet sand to complete absorption and purification.
[0011] The technical effect of the above improvement is: making full use of the hot air from the hot air source to dry the sand, improving the heat energy utilization efficiency, and at the same time filtering and purifying the tail gas through the sand, achieving mutual utilization, improving the sand drying efficiency while reducing the production cost.
[0012] As a further improvement of the above solution, the input end of the tail gas discharge pipe is branched and connected with a shunt pipe, and an adjustment valve is arranged on the shunt pipe; the blanking cylinders are interconnected through the shunt pipe.
[0013] The technical effect of the above improvement is: the waste heat tail gas can directly enter the blanking cylinder through the shunt pipe, then rise and enter the spiral circulation conveyor to dry the sand circulating in the spiral circulation conveyor; the flow rate of the waste heat tail gas entering the shunt pipe can be adjusted through the adjustment valve.
[0014] As a further improvement of the above solution, blanking cylinders are distributed at the bottom of the spiral circulation conveyor; the blanking cylinders include a first blanking cylinder and a second blanking cylinder; the length of the first blanking cylinder is greater than that of the second blanking cylinder; the first blanking cylinder is located between adjacent tail gas discharge pipes; the second blanking cylinder is located directly above the tail gas discharge pipes.
[0015] The technical effects of the above improvements are as follows: The first blanking cylinder is inserted into the sand, located between adjacent tail gas discharge pipes. The sand directly above the tail gas discharge pipes descends slowly due to the obstruction of the tail gas discharge pipes, while the sand between adjacent tail gas discharge pipes dries quickly, has a high downward flow frequency, and forms a high local cavity frequency. Therefore, the wet material can quickly fall from the first blanking cylinder into the local cavity to fill it, thus making full use of the characteristics of high drying speed and high flow speed in this area to improve the drying efficiency of the wet material. The second blanking cylinder is located above the required lowest sand surface and directly above the tail gas discharge pipes. When the sand surface drops, the wet material in the second blanking cylinder will fill this position, thereby ensuring the overall height of the sand surface remains stable. Only when the sand surface height is stable can the stable efficiency of tail gas purification be achieved.
[0016] As a further improvement of the above solution, the upper end of the box body is open, and the bottom is in the shape of a conical hopper.
[0017] The technical effects of the above improvements are as follows: The open upper end of the box body facilitates the discharge of the purified tail gas, and the conical hopper is used to collect the sand into the screw conveyor.
[0018] As a further improvement of the above solution, the tail gas discharge pipe is composed of multiple pipes arranged side by side to form a frame structure, and one end extends out through the side wall of the box body.
[0019] The technical effects of the above improvements are as follows: Increase the number of tail gas discharge pipes to improve the tail gas purification efficiency and thermal energy utilization rate.
[0020] As a further improvement of the above solution, the hot air pipe is composed of multiple pipes arranged side by side to form a frame structure, one end is connected to the hot air source, and the other end extends out from the side wall of the box body.
[0021] The technical effects of the above improvements are as follows: Improve the drying efficiency of the hot air pipe and the thermal energy utilization rate.
[0022] As a further improvement of the above solution, the tail gas discharge pipes and the hot air pipes are distributed in a crisscross pattern.
[0023] The technical effects of the above improvements are as follows: Improve the thermal energy utilization rate, and at the same time play a better supporting role for the sand, making the sand stay longer and having a better drying effect.
[0024] As a further improvement of the above solution, an annular heat dissipation plate is arranged axially on the hot air pipe.
[0025] The technical effects of the above improvements are as follows: Further improve the heat dissipation effect of the hot air pipe.
[0026] As a further improvement of the above solution, the spiral conveyor includes two conveying troughs arranged side by side, and a spiral conveyor shaft is arranged in the conveying trough; communication ports communicating with each other are opened at both ends of the two conveying troughs; the conveying directions of the two spiral conveyor shafts are different; a feed hopper is arranged above one of the conveying troughs.
[0027] The technical effect of the above improvement is that the sand circulates in the two conveying troughs and is filled into the empty blanking cylinder at any time.
[0028] As a further improvement of the above solution, a vibrator is arranged on the side of the screen.
[0029] The technical effect of the above improvement is that controlling the vibration of the screen through the vibrator can promote the flow of sand and prevent the sand from being blocked. Brief Description of the Drawings
[0030] Figure 1 It is a schematic structural diagram of the first embodiment of the device.
[0031] Figure 2 It is a schematic structural diagram of the second embodiment of the device.
[0032] Figure 3 It is a schematic structural diagram of the third embodiment of the device.
[0033] Figure 4 It is a bottom view of the tail gas discharge pipe.
[0034] Figure 5 It is a schematic structural diagram of the hot air pipe.
[0035] Figure 6 It is a diagram showing the positional distribution relationship between the tail gas discharge pipe and the hot air pipe.
[0036] Figure 7 It is a schematic structural diagram of the spiral conveyor.
[0037] In the figure: 1, hot air source; 2, conveyor; 4, shunt pipe; 5, regulating valve; 31, spiral conveyor; 32, feed hopper; 33, box body; 34, first blanking cylinder; 35, second blanking cylinder; 36, tail gas discharge pipe; 37, hot air pipe; 38, screen; 39, vibrator; 41, dust collector; 311, conveying trough; 312, spiral conveyor shaft; 313, communication port; 314, gear; 361, exhaust hole; 371, heat dissipation plate. Detailed Embodiments
[0038] In order to enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below in conjunction with embodiments. The description of this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present invention.
[0039] Example 1:
[0040] As Figure 1 、 4 shown in FIG. -7, the specific solution of this embodiment is: a wet material auxiliary drying device, including a box body 33 for containing wet materials. Inside the box body 33, from top to bottom, there are: a spiral circulation conveyor 31, an exhaust gas discharge pipe 36, a hot air pipe 37, and a screen 38; a spiral conveyor 2 is arranged at the bottom outlet of the box body 33; an exhaust hole 361 is arranged at the bottom of the exhaust gas discharge pipe 36; the bottom of the spiral circulation conveyor 31 is distributed with blanking cylinders inserted into the wet materials; one end of the hot air pipe 37 is connected to a hot air source 1; the inlet of the exhaust gas discharge pipe 36 is connected to a pipeline of hot air exhaust gas.
[0041] Specifically, the upper end of the box body 33 is open, the lower end is in the shape of a hopper, and a spiral conveyor 2 is designed at the bottom outlet; the box body 33 is used to contain wet sand; the wet materials first enter the spiral circulation conveyor 31 from the feed hopper 32, and the spiral circulation conveyor 31 evenly conveys the sand into the box body 33; a layer of hot air pipes 37 is distributed inside the box body 33. The hot air pipes 37 are formed by arranging multiple pipes side by side to form a frame structure, with one end connected to the hot air source 1 and the other end extending out from the side wall of the box body 33; heat dissipation plates 371 can be added to the hot air pipes 37 to improve the heat dissipation effect; a layer of exhaust gas discharge pipes 36 is distributed above the hot air pipes 37; the exhaust gas discharge pipes 36 are formed by arranging multiple pipes side by side to form a frame structure, with one end extending out through the side wall of the box body 33; exhaust holes 361 are evenly distributed at the bottom of the exhaust gas discharge pipes 36, which are used to discharge high-temperature exhaust gas into the wet sand to dry the sand and purify the exhaust gas at the same time; the exhaust gas discharge pipes 36 and the hot air pipes 37 are installed in a criss-cross manner; among them, the hot air source 1 can be a hot blast stove or the exhaust gas of a rear dryer.
[0042] As Figure 1 shown, above the exhaust gas discharge pipe 36 is the spiral circulation conveyor 31; the structure of the spiral circulation conveyor 31 is basically the same as that of the double spiral conveyor 2; the spiral circulation conveyor 31 includes two conveying troughs 311 arranged side by side, and a spiral conveyor shaft 312 is arranged inside the conveying troughs 311; communication ports 313 that communicate with each other are opened at both ends of the two conveying troughs 311; the conveying directions of the two spiral conveyor shafts 312 are different; a feed hopper 32 is arranged above one of the conveying troughs 311; one end of one of the spiral conveyor shafts 312 is connected to a motor, and the other end of the spiral conveyor shaft 312 is driven by a gear 314.
[0043] The wet material enters one of the conveying troughs 311 from the feed hopper 32, is conveyed to the end along with the spiral conveyor shaft 312, and then enters another conveying trough 311 through the communication port 313 at the end. The spiral conveyor shaft 312 in this conveying trough 311 has the opposite conveying direction, conveys the wet material to the other end, then passes through the communication port 313 at this end, and enters the previous conveying trough 311, so that the wet material circulates and flows in the spiral circulating conveyor 31. When the sand in one of the blanking cylinders at the bottom of the conveying trough 311 falls, the wet material in the spiral circulating conveyor 31 immediately fills the blanking cylinder;
[0044] The number of spiral circulating conveyors 31 is determined according to the area size of the upper port of the box body 33. Generally, 2 - 3 are used to achieve the effect of evenly discharging the wet material; the bottom of the conveying trough 311 of the spiral circulating conveyor 31 is distributed with blanking cylinders, and the blanking cylinders are inserted into the wet material.
[0045] In the present invention, the combination of the spiral circulating conveyor 31, the blanking cylinder, the tail gas discharge pipe 36, and the hot air pipe 37 has the following technical effects:
[0046] The hot air pipe 37 directly introduces the hot air from the hot air source 1 to dry the wet material in the box body 33; the hot air enters the dryer at the rear end of the hot air pipe 37 for secondary utilization; then it returns to the tail gas discharge pipe 36 for tertiary utilization; at the same time, the tail gas discharge pipe 36 can not only directly dry the sand by using the waste heat of the tail gas, but also absorb and purify the tail gas by using the wet sand material; the moisture in the sand has a good absorption effect on the particulate matter in the tail gas, and the gaps between the sands form a honeycomb structure that has a blocking and filtering effect on the tail gas; after the wet material absorbs enough particulate matter in the tail gas, it descends to the bottom of the box body 33 as the sand flows, and the new wet material falls down to absorb the tail gas newly, continuously, which has a good effect on the purification treatment of the tail gas.
[0047] The sand directly above the tail gas discharge pipe 36 has a slow descending speed due to the blockage of the tail gas discharge pipe 36, while the sand between adjacent tail gas discharge pipes 36 has a fast drying speed, a high downward flow frequency, and a high frequency of forming local cavities. Therefore, the wet material can quickly fall from the first blanking cylinder 34 into the local cavity to fill it, so as to make full use of the characteristics of high drying speed and high flow speed in this part, and improve the drying efficiency of the wet material; at the same time, the flowing wet material is used to purify the tail gas.
[0048] While the tail gas enters the wet sand material through the tail gas discharge pipe 36 and is absorbed and purified, the tail gas will rise and enter the spiral circulating conveyor 31 from the blanking cylinder, and dry the sand circulating in the spiral circulating conveyor 31 to improve the drying effect.
[0049] A layer of screen 38 is provided below the hot air duct 37, and a vibrator 39 can be installed on the screen 38; when the moisture in the wet material is reduced to a certain extent, the cohesion between the sands decreases, and they will fall into the screw conveyor 2 from the screen 38; the vibrator 39 can further promote the falling speed of the sands and prevent the sands from clogging.
[0050] Embodiment 2:
[0051] As Figure 2 shown, on the basis of the above embodiment, the input end of the tail gas discharge pipe 36 is branched and connected with a shunt pipe 4, and a regulating valve 5 is arranged on the shunt pipe 4; the blanking cylinders are interconnected through the shunt pipe 4.
[0052] The waste heat tail gas can directly enter the blanking cylinder through the shunt pipe 4, and then rise into the screw circulation conveyor 31 to dry the sands circulating in the screw circulation conveyor 31; the flow rate of the waste heat tail gas entering the shunt pipe 4 can be adjusted through the regulating valve 5.
[0053] Embodiment 3:
[0054] As Figure 3 shown, on the basis of the above embodiment, the blanking cylinder includes a first blanking cylinder 34 and a second blanking cylinder 35; the length of the first blanking cylinder 34 is greater than that of the second blanking cylinder 35; the first blanking cylinder 34 is located between adjacent tail gas discharge pipes 36; the second blanking cylinder 35 is located directly above the tail gas discharge pipe 36.
[0055] The first blanking cylinder 34 is inserted into the sand. Since the sand directly above the tail gas discharge pipe 36 is blocked by the tail gas discharge pipe 36, its falling speed is slow, while the sand between adjacent tail gas discharge pipes 36 has a high drying speed, a high downward flow frequency, and a high local cavity formation frequency. Therefore, the wet material can quickly fall from the first blanking cylinder 34 into the local cavity to fill it, thus making full use of the characteristics of high drying speed and high flow speed in this part and improving the drying efficiency of the wet material; the second blanking cylinder 35 is located above the required lowest sand surface and directly above the tail gas discharge pipe 36. When the sand surface drops, the wet material in the second blanking cylinder 35 will fill this position, thus ensuring that the overall height of the sand surface remains stable. Only when the sand surface height is stable can the stable efficiency of tail gas purification be achieved.
[0056] The working principle of the present invention:
[0057] The wet sand material first enters the screw circulation conveyor 31 from the feed hopper 32 and circulates in the screw circulation conveyor 31; when the sand in one of the blanking cylinders falls, the wet material in the screw circulation conveyor 31 will immediately fill into this blanking cylinder to ensure that the sand can quickly fill each blanking cylinder, achieving uniform distribution while improving the drying efficiency of the sand;
[0058] The first blanking cylinder 34 is inserted into the sand, located between adjacent tail gas discharge pipes 36. The sand directly above the tail gas discharge pipes 36 descends slowly due to the obstruction of the tail gas discharge pipes 36, while the sand between adjacent tail gas discharge pipes 36 dries quickly, has a high downward flow frequency, and forms a high local cavity frequency. Therefore, wet material can quickly fall from the first blanking cylinder 34 into the local cavity to fill it, thus making full use of the characteristics of high drying speed and high flow speed in this part to improve the drying efficiency of the wet material; The second blanking cylinder 35 is located above the required lowest sand surface and directly above the tail gas discharge pipes 36. When the sand surface drops, the wet material in the second blanking cylinder 35 will fill this position, thus ensuring the overall height of the sand surface remains stable. Only when the sand surface height is stable can the stable efficiency of tail gas purification be achieved.
[0059] While the tail gas enters the wet sand material through the tail gas discharge pipes 36 and is absorbed and purified, the tail gas will rise and enter the spiral circulation conveyor 31 through the blanking cylinder, drying the sand circulating in the spiral circulation conveyor 31 to improve the drying effect.
[0060] The hot air pipe 37 dries the sand. The tail gas discharge pipes 36 are discharged into the wet material from the exhaust holes 361 at the bottom. While the wet material purifies the tail gas, the wet material absorbs the waste heat of the tail gas for drying; The purpose of the tail gas discharge pipes 36 being located above the hot air pipe 37 is to ensure that the tail gas can contact the wet material to improve the purification effect; As the moisture in the sand decreases, the fluidity of the sand increases, and finally it falls into the spiral conveyor 2 from the screen 38;
[0061] This equipment is used for the pre-drying process in the sand wet material drying system. Through this equipment, about 65 - 75% of the moisture in the wet material can be removed.
[0062] The conveying process of the hot air:
[0063] The hot air discharged from the hot air source 1 enters the hot air pipe 37 and heats the hot air pipe 37; The hot air then enters other equipment through the pipeline, such as being reused in a dryer, then enters the dust collector 41 for primary filtration, and then returns to the tail gas discharge pipes 36 through the pipeline and is directly discharged into the wet sand material to complete absorption and purification.
[0064] This equipment is used for the pre-drying process in the sand drying process, which can reduce the pressure of the bag filter equipment at the back end of the sand drying system by 90%. The cost of the dust removal equipment can be greatly reduced, the service life can be extended, and the purpose of emission reduction is achieved.
[0065] The inlet temperature at the front end of the traditional dryer is about 600 degrees Celsius, 300 degrees Celsius in the middle, and the exhaust air at the tail takes away moisture at about 100 degrees Celsius. After adopting the present invention, the moisture in the sand can be reduced by about 65 - 75% in advance, the overall temperature inside the rear-end dryer can be maintained above 300 - 400 degrees Celsius, the drying effect is doubled, and the drying output can be easily increased by more than double. Therefore, the production capacity can be increased by more than double with the same original equipment. The dust content of the dried product is also significantly reduced compared with the traditional drying method.
[0066] It should be noted that in this article, the terms "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such a process, method, article or device. Specific examples are used in this article to elaborate on the principles and implementation manners of the technical solution of the present invention. The description of the above examples is only used to help understand the method of the present invention and its core idea. The above is only the preferred implementation manner of the present invention. It should be pointed out that due to the limited nature of written expression and the objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present invention.
Claims
1. A wet material-assisted drying device, characterized in that, It includes a box body (33) for containing wet materials. Inside the box body (33) from top to bottom are successively: a spiral circulation conveyor (31), an exhaust gas discharge pipe (36), a hot air pipe (37), and a screen (38); a spiral conveyor (2) is provided at the bottom outlet of the box body (33); an exhaust hole (361) is provided at the bottom of the exhaust gas discharge pipe (36); blanking cylinders inserted into the wet materials are distributed at the bottom of the spiral circulation conveyor (31); one end of the hot air pipe (37) is connected to a hot air source (1); the inlet of the exhaust gas discharge pipe (36) is connected to a pipeline for hot air exhaust gas.
2. The wet material auxiliary drying equipment according to claim 1, characterized in that, The hot air discharged from the hot air source (1) enters the hot air pipe (37), heats the hot air pipe (37), then enters other equipment that requires heat energy through a pipeline, and finally enters the dust collector (41) for primary filtration, and then returns to the exhaust gas discharge pipe (36) through a pipeline, and is directly discharged into the sand wet materials from the exhaust hole (361) to complete absorption and purification.
3. The wet material auxiliary drying equipment according to claim 1, characterized in that, A shunt pipe (4) is branched and connected to the input end of the exhaust gas discharge pipe (36), and a regulating valve (5) is provided on the shunt pipe (4); the blanking cylinders are interconnected through the shunt pipe (4).
4. The wet material auxiliary drying device according to claim 1, characterized in that, The blanking cylinders include a first blanking cylinder (34) and a second blanking cylinder (35); the length of the first blanking cylinder (34) is greater than that of the second blanking cylinder (35); the first blanking cylinder (34) is located between adjacent exhaust gas discharge pipes (36); the second blanking cylinder (35) is located directly above the exhaust gas discharge pipe (36).
5. The wet material auxiliary drying equipment according to claim 1, characterized in that, The exhaust gas discharge pipe (36) is formed by arranging multiple pipes side by side to form a frame structure, and one end extends out through the side wall of the box body (33).
6. The wet material auxiliary drying device according to claim 1, wherein, The hot air pipe (37) is formed by arranging multiple pipes side by side to form a frame structure, one end is connected to the hot air source (1), and the other end extends out from the side wall of the box body (33).
7. The wet material auxiliary drying equipment according to claim 1, characterized in that The exhaust gas discharge pipe (36) and the hot air pipe (37) are distributed in a crisscross pattern.
8. The wet material auxiliary drying device according to claim 1, characterized in that, An annular heat dissipation plate (371) is arranged axially on the hot air pipe (37).
9. The wet material auxiliary drying device according to claim 1, characterized in that The spiral circulation conveyor (31) includes two conveying troughs (311) arranged side by side, and a spiral conveyor shaft (312) is arranged in the conveying troughs (311); communication ports (313) communicating with each other are opened at both ends of the two conveying troughs (311); the conveying directions of the two spiral conveyor shafts (312) are different; a feed hopper (32) is arranged above one of the conveying troughs (311).
10. The wet material auxiliary drying equipment according to claim 1, characterized in that, A vibrator (39) is arranged on the side of the screen (38).