A powder batch-scale drying system

Abstract

This invention provides a batch-scale drying system for powders. The drying system includes a drying module and a collection module. The drying module includes a reaction device, a feeding device, an air inlet device, and a vacuum device. The reaction device includes a furnace, a heating device, and a crucible located inside the furnace. The air inlet device is connected to the reaction device via an air inlet pipe, one end of which passes through the furnace cover and the crucible cover, and is located inside the crucible. The vacuum device is connected to the reaction device via an air outlet pipe, one end of which passes through the furnace cover and the crucible cover, and is located inside the crucible. This drying system can significantly improve drying efficiency, shorten the drying cycle, and achieve batch-scale drying. Furthermore, this drying system can reduce the loss of specific surface area of ​​the graphene powder to be dried during the drying process, thereby improving the performance of graphene powder in composite materials.

Description

Technical Field

[0001] This utility model relates to a powder batch drying system. Background Technology

[0002] CVD (Chemical Vapor Deposition) is a method for the large-scale production of graphene powder, following oxidation-reduction and mechanical exfoliation. This method uses molten metal as a catalyst, introducing a carbon source gas into the molten metal. The grown graphene floats on the surface and is blown out by the gas flow. As long as the carbon source gas continues to flow, the graphene powder can grow continuously. However, some metal powder adheres to the graphene surface and is also blown out to a collection device along with the graphene powder. Therefore, purification is necessary to remove the metal impurities from the graphene surface. Since high-temperature purification is energy-intensive and costly, the industry standard still uses chemical methods to corrode the metal impurities, followed by water washing and filtration to obtain a graphene filter cake. The graphene filter cake is then dried in an oven to obtain dry graphene powder.

[0003] However, drying graphene filter cakes in an oven is time-consuming and difficult to collect, making it difficult to scale up the drying process. Furthermore, after water washing and filtration, the graphene flakes in the filter cake undergo interfacial adsorption under van der Waals forces. Drying the graphene filter cake in an oven results in significant stacking and adhesion of the dried graphene flakes, which reduces the specific surface area of ​​the graphene powder and affects its electrical conductivity, thermal conductivity, and mechanical properties in composite materials. Utility Model Content

[0004] To overcome the shortcomings of existing powder drying technologies, such as long drying time, difficult collection, and poor performance of the dried powder, this invention provides a batch-scale powder drying system. This system significantly improves drying efficiency, shortens the drying cycle, and enables batch-scale drying. Furthermore, it reduces the loss of specific surface area of ​​the graphene powder during the drying process, thereby improving the performance of graphene powder in composite materials.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This utility model provides a batch-scale drying system for powders, comprising a drying module and a collection module. The drying module includes a reaction device, a feeding device, an air inlet device, and a vacuum device. The reaction device includes a furnace, a heating device, and a crucible located inside the furnace. The furnace is a sealed structure formed by a furnace lid and a furnace body. The crucible is covered with a crucible lid. The feeding device includes a storage silo and a feeding pipe. One end of the feeding pipe is located at the bottom of the storage silo, and the other end passes through the furnace lid and the crucible lid, and is located inside the crucible. The air inlet device... A gas inlet pipe is connected to the reaction apparatus, with one end of the inlet pipe passing through the furnace cover and the crucible cover in sequence, and located inside the crucible; a vacuum device is connected to the reaction apparatus via a gas outlet pipe, with one end of the outlet pipe passing through the furnace cover and the crucible cover in sequence, and located inside the crucible; the collection module includes a powder collection device and a conveying device, with the powder collection device connected to the reaction apparatus via a discharge pipe; the conveying device is mounted on the discharge pipe, with one end of the discharge pipe passing through the furnace cover and the crucible cover in sequence, and located at the bottom of the crucible.

[0007] In this invention, the powder processed in the batch-scale drying system may include graphene powder.

[0008] In this invention, the structural design of the above-mentioned powder batch drying system enables continuous batch processing of powder from the drying module to the collection module.

[0009] In this invention, the sealed structure design in the reactor helps prevent the graphene powder from being oxidized and ablated during the high-temperature heating and drying process. Simultaneously, it ensures that the material to be dried remains under vacuum as it enters the high-temperature zone of the crucible through the feeding pipe and during the drying process. This allows the graphene material to experience a significant pressure difference under the suction force of the vacuum pump within a very short time after falling from near-room temperature into the crucible through the feeding pipe. This rapid pressure drop and temperature increase in the material separate the adsorbed graphene flakes, resulting in graphene powder with superior performance.

[0010] In some embodiments, the upper part of the storage silo is provided with an air inlet and an air outlet; by providing the air inlet and air outlet, the gas inside the storage silo can be replaced, thereby enabling the material to be dried stored in the storage silo to be in an inert gas environment and avoiding oxidation.

[0011] In some embodiments, one end of the feeding tube located inside the crucible has a bent structure, the angle between the bent structure and the feeding tube being 30°-60°, to block some heat radiation and protect the sealing assembly located above the furnace cover, while also blocking the heating effect on the graphene material to be dried as it passes through the heating tube during the feeding process.

[0012] In some embodiments, a pipe vibrator is provided at the bottom of the storage silo to prevent blocky filter cake from accumulating in the pipe.

[0013] In some embodiments, the furnace body and the furnace cover are sealed by flange sealing rings and several sets of hydraulic locking mechanisms; wherein, the number of hydraulic locking mechanisms can be 6 sets, and the sealing is achieved by automatic locking.

[0014] In some embodiments, the furnace body and / or the furnace cover are double-layered water-cooled structures.

[0015] In some embodiments, the crucible is provided with a base support at the bottom, the base support comprising alumina refractory brick or aluminosilicate refractory brick.

[0016] In some embodiments, the crucible lid is a double-layer structure consisting of an insulation layer and a structural load-bearing layer. The upper layer of the double-layer structure is the insulation layer, and the lower layer is the structural load-bearing layer. The insulation layer is a ceramic fiber blanket, ceramic fiber board, or carbon felt, and the structural load-bearing layer is a graphite plate or stainless steel plate, to prevent insulation material debris from falling into the crucible and contaminating the graphene powder.

[0017] In this invention, the heating device can be a conventional heating device in the art, which consists of alumina bricks as insulation material and iron-chromium-aluminum resistance wire.

[0018] In some embodiments, the joints between the air inlet pipe, the feeding pipe, the air outlet pipe and the furnace cover are all made of high-temperature resistant sealing components and are all equipped with water-cooled circulation devices; the interface of the water-cooled circulation device is connected to the main cooling water distributor.

[0019] The high-temperature resistant sealing component is made of fluororubber or silicone rubber.

[0020] In some embodiments, the outlet pipe is equipped with a filter inside; the outlet pipe is provided with a backflush branch, and the backflush branch is provided with a backflush nozzle for purging the filter.

[0021] In a specific embodiment, the filter includes a metal mesh filter element with a pore size of 1 to 10 μm.

[0022] In a specific implementation, the backflush nozzle is connected to an external nitrogen pipeline.

[0023] In some embodiments, the exhaust pipe is equipped with a first heat exchanger to reduce the exhaust gas temperature to protect the vacuum pump.

[0024] In this invention, preferably, one end of the vent pipe located inside the crucible is positioned close to the bottom surface of the crucible lid, and is 20-35 cm away from the surface of the powder material in the crucible. Maintaining a certain distance from the surface of the powder material in the crucible prevents the incompletely dried graphene powder from being sucked into the crucible, which would not only affect the vacuuming efficiency but also the powder drying efficiency.

[0025] In some embodiments, a second heat exchanger is provided on the discharge pipe to reduce the temperature in the graphene powder and protect the powder material conveying device.

[0026] In this invention, preferably, the distance between one end of the discharge pipe located inside the crucible and the bottom of the crucible is 2-4 cm. On the one hand, the dry graphene powder can be completely transported to the powder collection device through the powder conveying device, and on the other hand, the discharge pipe opening is prevented from being blocked due to poor airflow.

[0027] In some embodiments, the conveying device includes a fan.

[0028] In some embodiments, valves are provided on the upper air inlet of the storage silo, the feeding pipe, the air inlet pipe, the air outlet pipe, and the discharge pipe.

[0029] In this invention, the powder may include graphene powder.

[0030] In this invention, the powder batch-scale drying system may include a graphene powder batch-scale drying system.

[0031] In this invention, the large-scale powder drying system described above is used to dry graphene powder, comprising the following steps: S1, raising the internal temperature of the crucible to 450-650℃ and reducing the internal pressure of the crucible to below 200Pa using the heating device and the vacuum device; S2, under the temperature and pressure conditions of step S1, adding the filter cake to be dried stored in the storage silo into the crucible through the feeding pipe for drying; the storage silo is kept at normal temperature and pressure; S3, after the drying process is completed, conveying the dried powder to the powder collection device using the conveying device.

[0032] In this invention, the filter cake to be dried is brought into a high-temperature vacuum environment from room temperature and pressure in a very short time. Under the combined effect of a sudden drop in pressure and a sudden rise in temperature, the graphene powder micro-flakes that are locally stacked generate instantaneous high pressure due to the rapid vaporization and expansion of moisture, which separates the graphene micro-flakes that are in an adsorbed state.

[0033] In some embodiments, in step S1, when the internal temperature of the crucible rises to the target temperature, a heat preservation treatment is performed for 20 to 40 minutes; the "target temperature" here is 450-650°C.

[0034] In this invention, the filter cake to be dried is generally crushed until it does not exceed 1 / 2 the diameter of the feeding pipe.

[0035] In some embodiments, in step S2, the size of the filter cake to be dried is 15-35 mm.

[0036] In some embodiments, in step S2, the filter cake to be dried includes a graphene filter cake.

[0037] In some embodiments, in step S2, the storage silo undergoes an inert gas purging process, which includes: introducing inert gas into the storage silo and purging it for 15 to 25 minutes at normal pressure.

[0038] In a specific implementation, the inert gas includes nitrogen.

[0039] In a specific implementation, the flow rate of the inert gas is 5 L / min.

[0040] In some embodiments, in step S2, the water-cooled circulation device provided at the junction of the air inlet pipe, the feeding pipe, the air outlet pipe and the furnace cover is in the open state.

[0041] In some embodiments, the drying process in step S2 takes 1.5 to 2.5 hours.

[0042] In some embodiments, during step S2, during the drying process, the backflush nozzle of the exhaust pipe is activated to pulse-purge the filter located on the exhaust pipe.

[0043] In a specific implementation, the backflush frequency of the backflush nozzle is 10 to 20 times / min.

[0044] In some embodiments, in step S3, after the drying process is completed and before the conveying step, an inert gas is introduced into the crucible through the air inlet pipe to restore the pressure of the crucible to atmospheric pressure.

[0045] In this invention, after the powder dried in the crucible in the previous step is drawn into the powder collection tank, it can be fed a second time and dried, thereby realizing the batch and large-scale drying process of graphene powder.

[0046] In some embodiments, the drying process further includes step S4: after step S3 is completed, steps S1 to S3 are repeated.

[0047] Based on the above technical solution, this application has the following beneficial effects:

[0048] (1) Compared with traditional oven drying equipment, the powder batch and large-scale drying system of this application can significantly improve drying efficiency, shorten drying cycle, reduce cost, and facilitate large-scale production.

[0049] (2) The powder batch and large-scale drying system of this utility model significantly reduces the adsorption and adhesion phenomenon between graphene micro flakes during the drying process, thereby reducing the loss of the specific surface area of ​​the graphene powder to be dried during the drying process, and thus improving the electrical conductivity, thermal conductivity and mechanical properties of graphene powder in composite materials. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the structure of the powder batch-scale drying system of Embodiment 1 of this application.

[0051] Figure 2 This is a SEM image of the graphene powder obtained in Example 2 of this application;

[0052] Figure 3 The image shows the SEM image of the graphene powder obtained in Comparative Example 1.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1-Storage bin; 2-Graphene filter cake; 3-Air inlet; 4, 7, 9, 26, 27, 28-Valve; 5-Exhaust port; 6-Pipe vibrator; 8-Air inlet pipe; 10-Crucible cover; 11-Water cooling circulation device; 12-Feeding pipe; 13-Air outlet pipe; 14-Filter; 15-Backflush nozzle; 16-Heating device; 17-Furnace body; 18-Furnace cover; 19-Base support; 20-Crucible; 21-First heat exchanger; 22-Vacuum pump; 23-Fan; 24-Discharge pipe; 25-Dried powder; 29-Powder collection tank; 30-Discharge valve; 31-Hydraulic locking mechanism. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0056] Example 1

[0057] This embodiment provides a batch-scale drying system for graphene powder. Figure 1 This is a schematic diagram of the structure of the powder batch-scale drying system of this embodiment. The powder batch-scale drying system includes a drying module and a collection module; the drying module includes a reaction device, a feeding device, a feed device, and a vacuum device.

[0058] The reaction apparatus includes a reactor, a heating device 16, and a crucible 20 located inside the reactor. The reactor consists of an upper furnace cover 18 and a lower furnace body 17. The furnace body 17 and furnace cover 18 are automatically locked together by a flange sealing ring and six sets of hydraulic locking mechanisms 31 to form a sealed structure. The furnace body 17 and furnace cover 18 have a double-layer water-cooled structure. The crucible 20 is located in the middle of the furnace cavity. A base support 19, made of alumina refractory brick, is located at the bottom of the crucible 20. The heating device 16 uses resistance heating and is composed of alumina brick as insulation material and iron-chromium-aluminum resistance wire. The crucible cover 10 is located above the crucible opening and has a double-layer structure: a lower layer of graphite or stainless steel plate and an upper layer of ceramic fiber blanket, ceramic fiber board, or carbon felt.

[0059] The feeding device includes a storage bin 1 and a feeding pipe 12. The storage bin 1, located above the furnace cover 18, stores graphene filter cake 2 and has an air inlet 3 and an exhaust outlet 5 with valves 4 on its upper part. The air inlet pipe 8, the feeding pipe 12 with valves 7, the air outlet pipe 13, and the discharge pipe 24 all use high-temperature resistant sealing components at their junctions with the furnace cover 18, and are all equipped with a water-cooling circulation device 11. The interface of the water-cooling circulation device 11 is connected to the main cooling water distributor. The lower part of the feeding pipe 12 is designed with an inclination angle of 30–60°. A pipe vibrator 6 is installed at the lower part of the storage bin 1.

[0060] The air intake device is connected to the reaction device through an air intake pipe 8 with a valve 9.

[0061] The vacuum device is connected to the reaction device through the gas outlet pipe 13, and the gas outlet pipe 13 is provided with a backflush branch. The backflush branch is provided with a backflush nozzle 15, which is connected to an external nitrogen pipeline. The backflush frequency is 10 to 20 times / min. The filter 14 inside the gas outlet pipe 13 is a metal mesh filter element with a pore size of 1 to 10 μm.

[0062] Inside the crucible 20, one end of the discharge pipe 24 is close to the bottom of the crucible 20 by 2-4 cm, and one end of the gas discharge pipe 13 is close to the bottom of the crucible cover 10. A first heat exchanger 21 is installed between the gas discharge pipe 13 and the vacuum pump 22, and a valve 26 is provided. A second heat exchanger and a fan 23 are installed between the discharge pipe 24 and the powder collection tank 29 for collecting the dried powder 25. Along the direction of material conveying, a valve 27 is provided on the pipe upstream of the second heat exchanger, and a valve 28 is provided on the pipe downstream. A filter 14 and a backflushing device 15 are provided on the upper part of the powder collection tank 29, and a discharge valve 30 is provided at its discharge port.

[0063] Example 2

[0064] This embodiment provides a method for batch-scale drying of graphene powder, which uses the batch-scale drying system for graphene powder from Example 1, and includes the following steps:

[0065] ss1. Load the crushed block graphene filter cake (15-35mm in size) into the storage silo. Open the vent valve and the gas filling valve 4 of the storage silo. Introduce nitrogen gas into the storage silo at a flow rate of 5L / min through the gas inlet pipe. Perform gas replacement at normal pressure for 15-25 minutes. Then close the vent valve and the gas filling valve. During this process, the cooling water system is in the open state.

[0066] ss2. Start the vacuum pump to evacuate the reaction apparatus to a vacuum. When the pressure drops below 200 Pa, start the heating device to heat the crucible. When the crucible temperature reaches 450-650℃, keep it at that temperature for 20-40 minutes.

[0067] ss3. Then open valve 7 of the feeding pipe to feed the graphene filter cake into the crucible. The graphene filter cake changes from normal pressure and temperature to a sudden pressure drop and temperature rise in a very short time. Under the combined action of these two factors, the graphene powder micro-flakes that are locally stacked generate instantaneous high pressure due to the rapid vaporization and expansion of moisture, which separates the graphene micro-flakes in an adsorbed state. During this process, the vacuum pump is always in operation, and at the same time, the filter is purged in a pulse manner through the back-blowing nozzle to prevent the filter from clogging. Under the above conditions, the drying process lasts for 1.5 to 2.5 hours.

[0068] SS4. Next, close the valve connected to the vacuum pump, and simultaneously close valve 26 of the outlet pipe and the filter backflush pipe valve. Open valve 9 of the inlet pipe and introduce nitrogen gas at a rate of 50-200 L / min through the inlet pipe. Once the pressure inside the crucible returns to normal, open valves 27 and 28 of the outlet pipe and start the blower to transport the dried graphene powder in the crucible to the powder collection device. During discharge, close the backflush valve at the top of the powder collection device and valve 28 connected to the blower, open the discharge valve 30, and then collect the powder from the discharge port of the powder collection device.

[0069] 5. After the graphene filter cake to be dried is added to the crucible through the feeding pipe, close valve 7 at the bottom of the storage silo, add the graphene filter cake to be dried again, and at the same time, purge with nitrogen gas at a flow rate of 5L / min under normal pressure for 15-25 minutes. After the graphene powder dried in the crucible in the previous step is drawn into the powder collection tank, the second feeding and drying process can be carried out, thereby realizing the batch and large-scale drying process of graphene powder.

[0070] Comparative Example 1

[0071] This comparative example discloses a conventional method for drying graphene powder in the art, and the specific processing procedure is as follows:

[0072] The graphene powder to be dried was placed in a crucible and put into an oven at a drying temperature of 140℃ for 16 hours to obtain the dried graphene powder.

[0073] Example 1

[0074] This embodiment discloses the processing efficiency of drying graphene powder using the methods of Example 2 and Comparative Example 1.

[0075] Using the powder drying system of this invention, Example 2 can obtain 10-12 kg of dried graphene powder in a single batch. Based on a 24-hour workday, this allows for 7 drying cycles, resulting in a daily output of 70-84 kg. However, in Comparative Example 1, using a conventional oven at 140°C, the maximum processing volume per cycle is no more than 5 kg, and a single drying cycle takes 16 hours.

[0076] As can be seen, the drying efficiency of Example 2 using the powder drying system of this utility model is far higher than that of traditional powder drying processes.

[0077] Example 2

[0078] This effective example evaluates the performance of the graphene powder obtained in Example 2 and Comparative Example 2.

[0079] First, the morphology of the graphene powders obtained in Example 2 and Comparative Example 1 was analyzed using a scanning electron microscope (manufacturer: FEI Corporation, USA, model: Navo NanoSEM450), and their bulk density and specific surface area were obtained. Figure 2 The SEM image of the graphene powder obtained in Example 2 shows that there is no obvious stacking or adhesion between the graphene microsheets. Figure 3 The image shows an SEM image of the graphene powder obtained after drying in Comparative Example 1. It can be seen that the stacking and adhesion phenomenon between graphene sheets is quite obvious.

[0080] The results of the powder performance evaluation include:

[0081] 1. Calculation of carbon loss rate: For Comparative Example 2, the mass of graphene powder containing metal impurities before corrosion and purification is recorded as m1, and the mass of graphene powder after drying is recorded as m2; for Example 2, the mass of graphene powder containing metal impurities before corrosion and purification is recorded as m3, and the mass of graphene powder after drying is recorded as m4.

[0082] Through formula The carbon mass loss rate of the dried graphene powder was calculated.

[0083] 2. Oxygen content test: The oxygen content in the dried graphene powder was tested using a CHNSO elemental analyzer.

[0084] 3. Defect degree test: The dried graphene powder was subjected to Raman spectroscopy. The Raman spectrum showed that I... D / I G The defect degree of the dried graphene powder is obtained by ratio calculation.

[0085] 4. Composite film resistivity test: Add 3% dried graphene powder to a TPU solution containing 40% solids, stir and mix evenly, then coat the film on PET with a small automatic coating machine. After drying, measure the film thickness as 60µm, and test the resistivity of the composite film using a four-probe resistivity tester.

[0086] 5. Composite film thermal conductivity test: 3% dried graphene powder was added to a TPU solution containing 40% solids and mechanically stirred to mix evenly. The mixture was then coated on PET using a small automatic coating machine. After drying, the film thickness was measured to be 60µm. The thermal conductivity of the composite film was then tested using a laser thermal conductivity meter.

[0087] 6. Mechanical property testing: The workpiece obtained by adding 3% dried graphene powder to PP powder, premixing, melting and injection molding, and then testing the tensile strength and elongation at break of the composite material using a universal testing machine.

[0088] The properties of the graphene powder obtained by drying in Example 2 and the graphene powder obtained by drying in Comparative Example 1 were tested using the above test methods.

[0089] The bulk density of the dried graphene powder obtained by the method in this example is 0.01 g / cm³. 3 Specific surface area is 243 m² 2 / g, moisture content 0.15%, oxygen content 0.10%, carbon loss rate 0.08%, defect degree 0.35, composite film resistivity 2.62Ω·cm, composite film thermal conductivity 8.78W / m·K, workpiece tensile strength 23MPa, workpiece elongation at break 9.34%.

[0090] The bulk density of the dried graphene powder obtained in Comparative Example 2 was 0.024 g / cm³. 3 Specific surface area is 115m² 2 / g, moisture content 0.15%, oxygen content 0.09%, carbon loss rate 0, defect degree 0.35, composite film resistivity 4.92Ω·cm, composite film thermal conductivity 5.57W / m·K, workpiece tensile strength 17.5MPa, workpiece elongation at break 6.38%.

[0091] As can be seen, the specific surface area of ​​graphene powder dried in an oven is significantly reduced, and the electrical conductivity, thermal conductivity, and mechanical properties of the composite workpiece obtained by using it as an additive are also significantly reduced. Therefore, compared with conventional oven drying methods, the drying method of this application can better preserve the microstructure of graphene powder and avoid the problem of significant stacking and adhesion of graphene microflakes after drying due to interfacial adsorption between graphene microflakes in the filter cake after water washing and filtration under the action of van der Waals forces. This avoids the loss of specific surface area of ​​graphene powder during the drying process, thereby helping to improve its electrical conductivity, thermal conductivity, and mechanical properties in composite materials.

[0092] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A powder batch-up scale drying system, characterized by, It includes a drying module and a collection module; The drying module includes a reaction device, a feeding device, an air inlet device, and a vacuum device; The reaction apparatus includes a reaction furnace, a heating device and a crucible disposed inside the reaction furnace, the reaction furnace being a sealed structure formed by a furnace lid and a furnace body, and the crucible being provided with a crucible lid; The feeding device includes a storage bin and a feeding pipe; one end of the feeding pipe is located at the bottom of the storage bin, and the other end passes through the furnace cover and the crucible cover respectively, and is located inside the crucible; The air intake device is connected to the reaction device through an air intake pipe. One end of the air intake pipe passes through the furnace cover and the crucible cover in sequence and is located inside the crucible. The vacuum device is connected to the reaction device through an exhaust pipe, one end of which passes through the furnace cover and the crucible cover in sequence and is located inside the crucible; The collection module includes a powder collection device and a conveying device. The powder collection device is connected to the reaction device through a discharge pipe. The conveying device is installed on the discharge pipe, and one end of the discharge pipe passes through the furnace cover and the crucible cover in sequence, and is located at the bottom of the crucible.

2. The powder batch-scale drying system as described in claim 1, characterized in that, The upper part of the storage silo is provided with an air inlet and an air outlet; the lower part of the storage silo is provided with a pipe vibrator.

3. The powder batch-up scale drying system of claim 1, wherein, One end of the feeding tube located inside the crucible has a bent structure, and the angle formed between the bent structure and the feeding tube is 30°-60°.

4. The powder batch-up scale drying system of claim 1, wherein, The furnace body and the furnace cover are sealed by flange sealing rings and several sets of hydraulic locking mechanisms; The furnace body and / or the furnace cover are double-layer water-cooled structures.

5. The powder batch-up scale drying system of claim 1, wherein, The crucible is provided with a base support at the bottom, and the base support includes alumina refractory bricks or aluminosilicate refractory bricks. The crucible lid has a double-layer structure consisting of an insulation layer and a structural load-bearing layer, with the insulation layer located above the structural load-bearing layer; the insulation layer is a ceramic fiber blanket, ceramic fiber board, or carbon felt, and the structural load-bearing layer is a graphite plate or stainless steel plate.

6. The powder batch-up scale drying system of claim 1, wherein, The joints between the air inlet pipe, the feeding pipe, the air outlet pipe and the furnace cover are all made of high-temperature resistant sealing components and are all equipped with water-cooling circulation devices.

7. The powder batch-up scale drying system of claim 1, wherein, The air outlet pipe is equipped with a filter inside; the air outlet pipe is equipped with a backflush branch, and the backflush branch is equipped with a backflush nozzle for blowing the filter.

8. The powder batch-up scale drying system of claim 1, wherein, The exhaust pipe is equipped with a first heat exchanger; A second heat exchanger is installed on the discharge pipe.

9. The powder batch-up scale drying system of claim 1, wherein, The conveying device includes a fan.

10. The powder batch-up scale drying system of claim 1, wherein, Valves are provided on the upper air inlet of the storage silo, the feeding pipe, the air inlet pipe, the air outlet pipe, and the material outlet pipe.

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