CN107449264B - Polytetrafluoroethylene dispersion resin particle wet material drying system and method - Google Patents

Polytetrafluoroethylene dispersion resin particle wet material drying system and method Download PDF

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CN107449264B
CN107449264B CN201710832697.2A CN201710832697A CN107449264B CN 107449264 B CN107449264 B CN 107449264B CN 201710832697 A CN201710832697 A CN 201710832697A CN 107449264 B CN107449264 B CN 107449264B
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steam
air
drying
temperature
impurity removing
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CN107449264A (en
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周昆
游俊
康琪
何涛
曾涛
廖丰杰
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Sichuan Hope & Hot Pulse Microwave Tech Co ltd
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Sichuan Hope & Hot Pulse Microwave Tech Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/007—Dust filtering; Exhaust dust filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/08—Granular materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention discloses a polytetrafluoroethylene dispersion resin particle wet material drying system and method, and belongs to the technical field of organic chemical drying. In the invention, the drying device, the impurity removing device, the low-temperature air cooling device and the airtight packaging device are connected through the mesh belt conveying device to form a circulating conveying loop for tunnel continuous treatment, so that the processes of wet material feeding, microwave drying, microwave superheated steam drying, impurity removing, cooling and airtight packaging of polytetrafluoroethylene dispersion resin particles are orderly and effectively completed, and high-quality polytetrafluoroethylene resin dispersion particles with low moisture, low impurity residue, no caking and no fibrosis are produced, and the influence on the environment is effectively avoided; meanwhile, the material drying period is short, the drying system is high in efficiency, automatic feedback control is easy to realize, and the method is suitable for large-scale industrial production.

Description

Polytetrafluoroethylene dispersion resin particle wet material drying system and method
Technical Field
The invention relates to a wet material drying system and method, in particular to a rapid and continuous drying system and method for polytetrafluoroethylene dispersion resin particle wet materials, and belongs to the technical field of organic chemical drying.
Background
Polytetrafluoroethylene (PTFE) is a high molecular compound having excellent high and low temperature resistance and chemical stability, and also having corrosion resistance, high electrical insulation, high flame retardance, low thermal conductivity, and the like. Typical polytetrafluoroethylene articles are made from polytetrafluoroethylene suspension resin powder or dispersed resin particles; wherein, polytetrafluoroethylene dispersion resin particles are polymerized by monomer Tetrafluoroethylene (TFE) in water added with dispersing agent, emulsifying agent and initiator, the polymerization temperature is 40-80 ℃, the pressure is 0.3-2.6MPa, and the prepared polytetrafluoroethylene dispersion resin particles are water-containing wet materials, and the water content is 40-60%. And according to HG/T3028-1999: the water content of the qualified polytetrafluoroethylene dispersion resin particles is reduced to below 0.04%, so that the product quality is basically qualified, the lower the water content of the polytetrafluoroethylene is, the better the water content of the polytetrafluoroethylene is, the further the water content is reduced to 0.02%, and even lower, and the excellent performance is shown.
Although polytetrafluoroethylene has a relatively high density of about 2.13 to 2.23g/cm 3 However, the bulk density of the polytetrafluoroethylene dispersion resin particles is very low, about 475.+ -.100 g/L, and the average particle diameter is about 475.+ -.150. Mu.m, so that the heat conductivity of the bulk of the small particles loosely packed is far lower than that of polytetrafluoroethylene products, and therefore the polytetrafluoroethylene dispersion resin particles can be regarded as poor conductors of heat. Moreover, polytetrafluoroethylene dispersion resin particles are easy to compress, easy to agglomerate, not resistant to shearing force and easy to fibrillate, and high in electrical insulation, and easy to generate static electricity so as to adsorb dust in air; compression, agglomeration, fibrosis and dust pollution can reduce the quality of polytetrafluoroethylene dispersion resin particles, so that the product strength, the surface smoothness and the color change are reduced. In addition, the polytetrafluoroethylene dispersion resin particles had a dielectric constant of 2.1 and a dielectric loss tangent of 3X10 -4 The ability of absorbing microwaves is extremely low, and the heat cannot be generated under the action of the microwaves. Because of the above characteristics, most conventional and efficient drying methods are difficult to be effectively applied when drying wet materials.
Conventional drying methods for polytetrafluoroethylene dispersion resin particles are generally oven methods, such as: the invention patent with publication number of CN101000208 and patent name of 'drying method of polytetrafluoroethylene dispersion resin' adopts a heat exchanger to heat, then hot air and the heat exchanger are introduced to heat together, dehydration is carried out under the condition of vacuum negative pressure, and the drying period is 13-18h; the invention discloses a patent with publication number of CN102914123, and the patent name of the patent is a drying method of polytetrafluoroethylene dispersion resin, which adopts a drying method in a hot air circulation dryer (namely an oven) by taking air as a heat transfer medium, and the drying period is 18-23h. According to the drying principle, the air has extremely low specific heat capacity under normal pressure, and the heat energy carried by the hot air (hot air) with unit flow is extremely limited; meanwhile, because the polytetrafluoroethylene dispersion resin particles are poor conductors of heat, the heat exchange efficiency is low, the heat transfer performance is poor, the heat energy waste is large, and the overall temperature of the material is slowly raised, so that a long time is required to reduce the water content of the polytetrafluoroethylene dispersion resin particles to a required level. Because the drying energy consumption is high and the drying period is long, continuous production is difficult to realize by using the traditional drying method, and the continuous large-scale industrial production requirement is difficult to meet.
In addition, the fluidized bed drying process is a method for fluidizing and fast drying materials by taking hot air as a medium and forming high-speed air flow, and when the method is used for the polytetrafluoroethylene dispersion resin particle drying process, polytetrafluoroethylene dispersion resin particles are subjected to extrusion and shearing force due to the excessively high air flow speed, and are agglomerated and fibrillated to form waste products. The patent with publication number CN103148689 is a continuous drying device which uses conveyor belt to convey material and air as heat transfer medium (up-in and down-out), and also has very low specific heat capacity under normal pressure, very limited energy carried by hot air (hot air) with unit flow rate at a certain temperature, low heat exchange efficiency and poor heat transfer performance, and also has very slow overall material temperature rise and long drying period. Therefore, to perform quick drying by using the device described in this patent, according to the drying principle, low-speed hot air cannot be adopted, but only the hot air flow can be increased to overcome the above problems, but the large air flow and high air speed can cause a large amount of agglomeration and fibrosis of the polytetrafluoroethylene dispersion resin particles, particularly, hot air is adopted to enter and exit from the top, the air flow is influenced by the air resistance of the material and the conveyor belt, a large air pressure can be formed on the material, the polytetrafluoroethylene dispersion resin particles are subjected to relatively large extrusion force and shearing force, and can be softened under the high-temperature condition, so that the agglomeration and fibrosis degree is increased, and therefore, the patent cannot realize quick, low-moisture and non-fibrosis drying in actual production at the same time, and cannot reduce the energy consumption level. In addition, the above patents all use air as a heat transfer medium, and even if a filter is used to reduce the dust content in the air, the dust cannot be removed completely due to the influence of the reduction of the filtering precision, the quality of a filter screen and the filtering performance of the filter, the drying period is very long, a large amount of air passes through the materials for a long time to generate electrostatic adsorption, and finally, the dispersion resin particles are easily polluted by the dust, so that the stability of the product quality is seriously affected.
The invention patent with publication number CN101495830, patent name of "drying method, manufacturing method and manufacturing device of hydrophobic powder", first make water evaporate by microwave heating, and let in about 80 ℃ hot air to take away the water vapor, reduce the water content of the material to about 20%, then continue heating for about 70 minutes by 160 ℃ hot air alone, finally carry on 155 ℃ to the material, 30min of heat preservation heat treatment, the whole drying cycle is 2-3h. But this patent has the following problems in practice:
firstly, in a first drying process, a metal bottom plate tray is used for loading, and although a certain height is kept between an upper tray and a lower tray according to the patent description of the process, microwaves can heat materials, according to the microwave heating theory, the metal bottom plate can reflect and interfere with microwave coupling, so that the microwave heating efficiency is reduced, the microwave drying time of the process is longer, and the moisture content after drying is still up to 20%;
secondly, the total drying period is still longer, and the air is continuously introduced and exhausted in the first drying process and the second drying process which occupy most of the drying period, so that the influence of air dust pollution on the quality and stability of polytetrafluoroethylene dispersion resin particles cannot be avoided;
Thirdly, the temperature maintained in the third procedure, even the temperature in the whole drying process, is not higher than 155-160 ℃ and lower than the boiling point of main impurities in the materials (for example, the boiling point of the perfluoro caprylic acid with the highest residual ratio is 189-191 ℃), so that the aim of removing the impurities is difficult to achieve, and finally, the quality indexes such as color, smoothness and the like of the product are influenced;
in the comprehensive view, the existing polytetrafluoroethylene dispersion resin particle drying technology or device has the problems of low drying speed, long drying period, high energy consumption and the like, and even has the problems of product pollution, agglomeration, fibrosis and the like which influence the quality of finished products due to the use of external air.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a polytetrafluoroethylene dispersion resin particle wet material drying system and a polytetrafluoroethylene dispersion resin particle wet material drying method. In the invention, the drying device, the impurity removing device, the low-temperature air cooling device and the airtight packaging device are connected through the mesh belt conveying device to form a circulating conveying loop for tunnel continuous treatment, so that the processes of feeding, microwave drying, microwave superheated steam drying, impurity removing, cooling and airtight packaging of polytetrafluoroethylene dispersed resin particles are orderly and effectively completed, and the method is suitable for large-scale industrial production.
In order to achieve the technical purpose, the following technical scheme is provided:
the wet polytetrafluoroethylene dispersion resin particle material drying system comprises a drying device, a impurity removing device, a low-temperature air cooling device and a closed packaging device, wherein the drying device, the impurity removing device, the low-temperature air cooling device and the closed packaging device are sequentially connected through a mesh belt conveying device;
a system feeding section is arranged at the front side of a station of the drying device, the system feeding section is arranged on a conveying mesh belt, and a feeding conveying device is arranged above the station of the system feeding section and is used for continuously inputting initial materials into the drying system;
the system discharging section is arranged at the rear side of the station of the low-temperature air cooling device and is arranged on the conveying mesh belt, and the system discharging section is connected with the airtight packaging device which receives the dry materials output by the system.
Further, the drying device comprises a drying device body, a microwave energy leakage inhibitor I and a vertical air baffle I which are arranged at two sides of the drying device body, the drying device body is connected with a microwave generator, and a steam exhaust port is arranged at the upper end of the drying device body; the drying device body comprises a metal shell, the metal shell comprises stainless steel or aluminum, and the metal shell can prevent microwave leakage.
Further, the impurity removing device comprises an impurity removing device body, a microwave energy leakage inhibitor II and a vertical air baffle II which are arranged at two sides of the impurity removing device body, and the impurity removing device body is connected with a microwave generator; the impurity removing device comprises a impurity removing device body, wherein a mesh plate is arranged in the impurity removing device body and comprises a mesh plate I and a mesh plate II, the mesh plate I is arranged at the top of the impurity removing device body, and the mesh plate II is arranged at the bottom of the impurity removing device body; the upper end of the impurity removing device body is provided with an air outlet cover, the air outlet cover is provided with a steam outlet, the lower end of the impurity removing device body is provided with an air inlet cover, and the air inlet cover is provided with a steam inlet; the impurity removing device body comprises a metal shell, the metal shell comprises stainless steel or aluminum, and the metal shell can prevent microwave leakage.
Further, the impurity removing device is connected with a superheated steam circulating device, one end of the superheated steam circulating device is connected with a steam outlet, and the other end of the superheated steam circulating device is connected with a steam inlet; the superheated steam circulating device comprises a steam purifying device, a steam circulating fan and a steam superheated furnace, the steam purifying device, the steam circulating fan and the steam superheated furnace are sequentially connected through a steam conveying pipe, and the impurity removing device, the steam purifying device, the steam circulating fan and the steam superheated furnace form a steam circulating closed circuit through the steam conveying pipe.
Further, a tee joint I and a tee joint II are arranged between the steam circulating fan and the steam superheating furnace, the tee joint I and the tee joint II are both arranged on the steam conveying pipe, the tee joint I is connected with an exhaust valve, and the tee joint II is connected with an inflation valve.
Further, the low temperature air cooling device comprises a low temperature air cooling device body and vertical air baffle plates III arranged on two sides of the low temperature air cooling device body, an air outlet is formed in the upper end of the low temperature air cooling device body, and an air inlet is formed in the lower end of the low temperature air cooling device body.
Further, the low-temperature air cooling device is connected with a cold air circulating device, one end of the cold air circulating device is connected with the air outlet, and the other end of the cold air circulating device is connected with the air inlet; the cold air circulating device comprises an air purifying device, an air circulating fan and an air cooling device, wherein the air purifying device, the air circulating fan and the air cooling device are sequentially connected through an air conveying pipe, and the low-temperature air cooling device, the air purifying device, the air circulating fan and the air cooling device form a cold air circulating closed circuit through the air conveying pipe.
Furthermore, the airtight packaging device comprises a totally-enclosed shell, the shell can effectively prevent the inside of the packaging device from exchanging gas with the outside, and the airtight packaging device has the functions of weighing and packaging.
Further, the conveying mesh belt is made of polytetrafluoroethylene glass fiber.
A method for drying polytetrafluoroethylene dispersion resin particle wet materials comprises the following steps:
A. feeding material
Feeding polytetrafluoroethylene dispersion resin particle wet materials serving as initial materials by using a feeding conveying device, and uniformly distributing the initial materials on a conveying mesh belt of a feeding section of the system;
B. microwave drying
C, the initial material supplied in the step A enters a drying device through a conveying mesh belt, the initial material moves for 5-15min in the drying device and is subjected to the action of microwaves for 5-15min, water in the initial material is gasified into water vapor, the water vapor naturally overflows from a vapor outlet, and the temperature of the initial material in the drying period is controlled to be less than or equal to 100 ℃ to obtain a material I;
C. microwave, high-temperature superheated steam drying and impurity removal
B, conveying the dried material I in the step B into a impurity removing device through a conveying mesh belt, enabling the material I to travel for 10-25min in the impurity removing device, enabling the material I to be subjected to the action of microwave and high-temperature superheated steam for 10-25min, regulating and controlling the temperature in the impurity removing device at 200-250 ℃, enabling hydration gas in the material I to be steam, enabling impurities in the material I to be gasified, enabling the steam to enter an air outlet cover through the mesh plate I together with the steam containing the impurities under the traction effect of a steam circulating fan, and enabling the steam to enter the superheated steam circulating device through a steam outlet on the air outlet cover; in the superheated steam circulation device, water vapor and impurity-containing steam sequentially pass through the steam purification device and are cooled to 120-160 ℃, residual impurities mixed in the material I are removed, superheated steam without impurities is obtained, the superheated steam enters the steam superheating furnace under the action of the steam circulation fan, the superheated steam is heated to high temperature of 200-250 ℃ in the steam superheating furnace, the high temperature superheated steam enters the air inlet cover through the steam inlet, and then is diffused into the impurity removal device through the mesh plate II; in the impurity removing device, high-temperature superheated steam sequentially passes through a conveying mesh belt, a material I and a mesh plate I at the speed of 0.1-2.0m/s, and finally passes through a steam outlet on an air outlet cover to finish one-time circulation; continuously circulating for 10-25min, and heating the material I to 195-240 ℃ to obtain a material II;
D. Cooling
C, feeding the dried and decontaminated material II into a low-temperature air cooling device along with a conveying mesh belt, and moving the material II in the low-temperature air cooling device for 10-25min to obtain a material III;
in the low-temperature air cooling device, the discharged air enters the cold air circulation device through the air outlet; in the cold air circulation device, the discharged air is pulled by an air circulation fan, filtered by an air purification device, enters the air cooling device for cooling and dewatering to obtain clean dry and cold air at-30 to-15 ℃, the dry and cold air enters the low-temperature air cooling device through an air inlet at 0.1 to 2.0m/s to cool a material II, the dry and cold air is heated and discharged through an air outlet, one-time circulation is completed, and after continuous circulation for 10 to 25min, the material II is cooled to 10 to 19 ℃ to obtain a material III;
E. sealed package
And D, conveying the cooled material III to a closed packaging device along with a conveying mesh belt from a system discharge end section, and weighing and packaging the material III in the closed packaging device.
After detection, the following steps are obtained: in the step B, the water content of the material I is 5-10%; in the step C, the water content of the material II is below 0.02%, and the impurity removal rate is above 99.5%; in the step D, the water content of the material III is below 0.02%.
By adopting the technical scheme, the beneficial technical effects brought are as follows:
1) In the invention, the drying device, the impurity removing device, the low-temperature air cooling device and the closed packaging device are connected through the mesh belt conveying device to form a circulating conveying loop for tunnel continuous treatment, thereby orderly and effectively completing the polytetrafluoroethylene dispersion resin particle wet material drying process. The invention can produce high-quality polytetrafluoroethylene resin dispersion particles with low moisture content (the water content is below 0.02 percent), low impurity residue (the removal rate is above 99.5 percent), no caking and no fibrosis, the application performances such as tensile strength and the like are 5-10 percent higher than those of the traditional mode, and the influence on the environment is effectively avoided; meanwhile, the material drying period is short, the drying system is high in efficiency, automatic feedback control is easy, and the method is suitable for large-scale industrial production;
2) In the step B, the average water content of the initial raw materials entering the drying device is high, so that the water content of the initial raw materials can be reduced to 5-10% within 5-15 min. The steam continuously generated under the action of microwaves is limited by the vertical air baffle I, so that the steam cannot overflow from two sides of the drying device, micro positive pressure is formed in the drying device, and the steam naturally overflows from the steam exhaust port, so that the unpowered and other gas-free exhaust flow rate is low, the flow is small, the material cannot be extruded and sheared, and the phenomenon that dust is brought into by air to pollute the material is avoided; meanwhile, the temperature of the steam is limited by the boiling point of normal pressure water, and the temperature of the steam is about 100 ℃, and the temperature of the material is not higher than 100 ℃ and is far lower than the boiling point of the residual additive and the decomposition temperature of the material due to the polymerization reaction, so in the step B, the residual additive of the polymerization reaction of the material is not gasified and decomposed into gas except water, the generated steam is purer, does not contain pollutants harmful to the environment, and can be directly discharged or used;
3) In the step C of the invention, the material I advances for 10-25min in the impurity removing device and is acted by the superheated steam circulating device, so that the water content of the material II can be promoted to be less than 0.02%. The high-temperature superheated steam sequentially passes through the conveying mesh belt, the material I and the mesh plate I from bottom to top at the flow rate of 0.1-2.0m/s, because the flow rate of the high-temperature superheated steam is low, the generated wind pressure is small, larger mechanical force cannot be generated on the material I, the acting direction of the high-temperature superheated steam is opposite to the gravity direction, the extrusion and shearing among particles of the material I can be effectively reduced, and the agglomeration and fiberization of the material I can be effectively avoided. The steam circulation device is used for realizing energy recycling, the cost can be effectively saved, the water vapor is purified by the steam purification device and is cooled to 120-160 ℃, at the temperature, after the residual additive vapor in the polymerization reaction is removed, the temperature of the steam is still higher, the steam cannot be condensed, the waste of vaporization latent heat is avoided, and the energy consumption required for heating is relatively low when the steam is heated by the steam superheating furnace. Because the constant pressure specific heat capacity of the superheated steam is larger, the higher drying efficiency can be generated only by introducing a small amount of high-temperature superheated steam, the high-temperature superheated steam acts with microwaves on one hand, the vaporization of residual moisture is quickened, on the other hand, the temperature of materials and the surrounding environment can be quickly increased to be more than 100 ℃, the water condensation which is just vaporized is prevented, and the materials and the surrounding environment are taken out of the drying and impurity removing device; meanwhile, high-temperature superheated steam with the temperature of 200-250 ℃ is introduced, the temperature of the material I is increased to 195-240 ℃ which exceeds the boiling point of the dispersant perfluoro caprylic acid in polytetrafluoroethylene or the decomposition temperature (more than or equal to 130 ℃) of ammonium perfluoro caprylate, so that the dispersant perfluoro caprylic acid can be completely gasified and separated from the material, and the perfluoro caprylic acid is carried out of a drying and impurity removing device along with the superheated steam after being completely gasified, thereby effectively avoiding perfluoro caprylic acid residues in a dried finished product of the material;
4) In the step D of the invention, the material II moves for 10-25min in the impurity removing device and is acted by the cold air circulating device, so that the water content of the material III can be maintained below 0.02%. In the low-temperature air cooling device, dry and cold air enters the low-temperature air cooling device through the air inlet at the flow rate of 0.1-2.0m/s and is diffused from bottom to top, the dry and cold air cools the material II, and because the flow rate of the dry and cold air is low, the generated wind pressure is small, the material II cannot be subjected to larger mechanical force, the action direction of the dry and cold air is opposite to the gravity direction, the extrusion and shearing among particles of the material II can be effectively reduced, and agglomeration and fibrosis of the material II can be effectively avoided. When the material II is cooled to 10-19 ℃, the tolerance of polytetrafluoroethylene dispersion resin particles to extrusion force and shearing force can be effectively improved, and caking and fibrosis of the material III during the packaging in the subsequent step E are effectively avoided. In the step D, although air is used as a medium for cooling the materials, the air is not polluted in the circulating device, and the air purifying device is arranged as a precaution measure, so that the circulating air can be kept clean without polluting the materials; when the material II is cooled to 10-19 ℃, the temperature of the material II is lower, and condensation water phenomenon is easy to occur on the surface of the material II under the condition of higher air humidity, so that a full-sealed shell is adopted in a subsequent packaging device to finish packaging, and the water content of a dried material finished product can be prevented from being influenced;
5) In the invention, before the impurity removing device starts to operate, clean superheated steam is filled into the superheated steam circulating device through the tee joint II and the charging valve for microwave drying, microwave superheated steam drying and impurity removing. In the step C, the water in the material I is continuously vaporized, so that the steam in the drying impurity removing device and the superheated steam circulating device is increased, the increased steam can be discharged through the tee joint I and the exhaust valve, the circulating system is kept stable, and in addition, the steam is purified by the steam purifying device before being discharged, and the steam does not contain harmful environmental pollutants and can be directly discharged or used;
6) In the step B, C, D, the material drying and cooling time is shorter, the time for completing the step B is 5-15min, the time for completing the step C is 10-25min, and the time for completing the step D is 10-25min, wherein the drying period is 15-40min, the drying and cooling period is 25-65min, the material drying and cooling processing period is greatly shortened, and the probability of caking, fibrosis and pollution of the material in the processing process is further reduced.
Drawings
FIG. 1 is a schematic diagram of a drying system according to the present invention
In the figure, 1, a drying device, 101, a drying device body, 102, a microwave leakage inhibitor I, 103, a vertical air baffle I, 104, a steam outlet, 2, a impurity removing device, 201, an impurity removing device body, 202, a microwave leakage inhibitor II, 203, a vertical air baffle II, 204, a mesh plate I, 205, a mesh plate II, 3, a low-temperature air cooling device, 301, a low-temperature air cooling device body, 302, a vertical air baffle III, 303, an air outlet, 304, an air inlet, 4, a closed packaging device, 5, a mesh belt conveying device, 501, a driving roller, 502, a conveying mesh belt, 6, a system feeding section, 7, a feeding conveying device, 8, a system discharging section, 9, a microwave generator, 10, an air outlet cover, 11, a steam outlet, 12, an air inlet cover, 13, a steam inlet, 14, a superheated steam circulation device, 1401, a steam purifying device, 1402, a steam circulation fan, 1403, a steam superheating furnace, 1404, a steam conveying pipe, 1405, a tee I, 1406, tee II, 15, 16, a driving roller, 17, a system feeding section, a cooling fan 1703, an air circulation device, an air cooling device, a cooling device.
Detailed Description
In the following, it is obvious that the embodiments described are only some embodiments of the present invention, but not all embodiments, by clearly and completely describing the technical solutions in the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The polytetrafluoroethylene dispersion resin particle wet material drying system comprises a drying device 1, a impurity removing device 2, a low-temperature air cooling device 3 and a closed packaging device 4, wherein the drying device 1, the impurity removing device 2, the low-temperature air cooling device 3 and the closed packaging device 4 are sequentially connected through a mesh belt conveying device 5, the mesh belt conveying device 5 comprises a driving roller 501 and a conveying mesh belt 502, the driving roller 501 drives the conveying mesh belt 502 to move, and the conveying mesh belt 502 sequentially passes through the drying device 1, the impurity removing device 2, the low-temperature air cooling device 3 and the closed packaging device 4 to form a circulating conveying loop; a system feeding section 6 is arranged at the front side of a station of the drying device 1, the system feeding section 6 is arranged on a conveying mesh belt 502, a feeding conveying device 7 is arranged above the station of the system feeding section 6, and the feeding conveying device 7 is used for continuously inputting initial materials into the drying system; the rear side of the station of the low-temperature air cooling device 3 is provided with a system discharging section 8, the system discharging section 8 is arranged on the conveying mesh belt 502, the system discharging section 8 is connected with the airtight packaging device 4, and the airtight packaging device 4 receives dry materials output by the system.
Further, the drying device 1 comprises a drying device body 101, and a microwave energy leakage inhibitor I102 and a vertical air baffle I103 which are arranged on two sides of the drying device body 101, wherein the drying device body 101 is connected with a microwave generator 9, and a steam exhaust port 104 is arranged at the upper end of the drying device body 101; the drying device body 101 includes a metal housing including stainless steel or aluminum, which can prevent microwave leakage.
Further, the impurity removing device 2 comprises an impurity removing device body 201, and a microwave energy leakage inhibitor II 202 and a vertical air baffle II 203 which are arranged on two sides of the impurity removing device body 201, wherein the impurity removing device body 201 is connected with a microwave generator 9; the impurity removing device body 201 is internally provided with a mesh plate which comprises a mesh plate I204 and a mesh plate II 205, the mesh plate I204 is arranged at the top of the impurity removing device body 201, and the mesh plate II 205 is arranged at the bottom of the impurity removing device body 201; the upper end of the impurity removing device body 201 is provided with an air outlet cover 10, the air outlet cover 10 is provided with a steam outlet 11, the lower end of the impurity removing device body 201 is provided with an air inlet cover 12, and the air inlet cover 12 is provided with a steam inlet 13; the impurity removing device body 201 includes a metal housing, which includes stainless steel or aluminum, and prevents microwave leakage.
Further, the impurity removing device 2 is connected with a superheated steam circulating device 14, one end of the superheated steam circulating device 14 is connected with the steam outlet 11, and the other end is connected with the steam inlet 13; the superheated steam circulation device 14 comprises a steam purification device 1401, a steam circulation fan 1402 and a steam superheating furnace 1403, the steam purification device 1401, the steam circulation fan 1402 and the steam superheating furnace 1403 are sequentially connected through a steam conveying pipe 1404, and the impurity removal device 2, the steam purification device 1401, the steam circulation fan 1402 and the steam superheating furnace 1403 form a steam circulation closed circuit through the steam conveying pipe 1404.
Further, the low-temperature air cooling device 3 includes a low-temperature air cooling device body 301 and vertical air baffles iii 302 disposed on two sides of the low-temperature air cooling device body 301, an air outlet 303 is disposed at an upper end of the low-temperature air cooling device body 301, and an air inlet 304 is disposed at a lower end of the low-temperature air cooling device body 301.
Further, the low-temperature air cooling device 3 is connected with a cold air circulating device 17, one end of the cold air circulating device 17 is connected with an air outlet 303, and the other end is connected with an air inlet 304; the cold air circulation device 17 comprises an air purification device 1701, an air circulation fan 1702 and an air cooling device 1703, wherein the air purification device 1701, the air circulation fan 1702 and the air cooling device 1703 are sequentially connected through an air conveying pipe 1704, and the cold air circulation device 3 forms a cold air circulation closed circuit with the air purification device 1701, the air circulation fan 1702 and the air cooling device 1703 through the air conveying pipe 1704.
Further, the airtight packaging device 4 comprises a fully-closed shell, the shell can effectively prevent the inside of the packaging device from exchanging gas with the outside, and the airtight packaging device 4 has the functions of weighing and packaging.
A method for drying polytetrafluoroethylene dispersion resin particle wet materials comprises the following steps:
A. feeding material
Using a feeding and conveying device 7 to supply polytetrafluoroethylene dispersion resin particle wet materials with the water content of 50% as initial materials, and uniformly distributing the materials on a conveying mesh belt 502 of a system feeding section 6;
B. microwave drying
The initial material supplied in the step A enters the drying device 1 through the conveying mesh belt 502, the initial material moves in the drying device 1 for 5min and is subjected to the action of microwaves for 5min, water in the initial material is vaporized into water vapor, the water naturally overflows from the vapor discharge port 104, and the temperature of the initial material during the drying period is controlled to be 90 ℃ to obtain a material I;
C. microwave, high-temperature superheated steam drying and impurity removal
B, conveying the dried material I in the step B into a impurity removing device 2 through a conveying mesh belt 502, enabling the material I to move in the impurity removing device 2 for 10min, enabling the material I to be subjected to the action of microwaves and high-temperature superheated steam for 10min, regulating and controlling the temperature in the impurity removing device 2 at 200 ℃, enabling hydration gas in the material I to be steam, gasifying impurities in the material I, enabling the steam to enter an air outlet cover 10 through a mesh plate I204 together with the steam containing the impurities under the traction action of a steam circulating fan 1402, and enabling the steam to enter a superheated steam circulating device 14 through a steam outlet 11 on the air outlet cover 10; in the superheated steam circulation device 14, water vapor and impurity-containing steam sequentially pass through the steam purification device 1401, are cooled to 120 ℃, and remove mixed residual impurities in the material I to obtain superheated steam without impurities, wherein the superheated steam enters the steam superheating furnace 1403 under the action of the steam circulation fan 1402, is heated to high-temperature superheated steam with the temperature of 200 ℃ in the steam superheating furnace 1403, enters the air inlet cover 12 through the steam inlet 13, and is diffused into the impurity removal device 2 through the mesh plate II 205; in the impurity removing device 2, high-temperature superheated steam sequentially passes through a conveying mesh belt 502, a material I and a mesh plate I204 at 0.1m/s, and finally passes through a steam outlet 11 on an air outlet cover 10 to complete one-time circulation, and after continuous circulation for 10min, the material I is heated to 195 ℃ to obtain a material II;
D. Cooling
C, feeding the dried and decontaminated material II into a low-temperature air cooling device 3 along with a conveying mesh belt 502, and feeding the material II into the low-temperature air cooling device 3 for 10min to obtain a material III;
in the low-temperature air cooling device 3, the discharged air enters the cold air circulation device 17 through the air outlet 303; in the cold air circulation device 17, the discharged air is pulled by an air circulation fan 1702, filtered by an air purification device 1701, enters an air cooling device 1703 for cooling and dewatering to obtain clean dry and cold air at-30 ℃, the dry and cold air enters the low-temperature air cooling device 3 through an air inlet 304 at 0.1m/s, the material II is cooled, and meanwhile, the dry and cold air is heated and discharged through an air outlet 303, one-time circulation is completed, and after continuous circulation for 10min, the material II is cooled to 10 ℃ to obtain a material III;
E. sealed package
And D, conveying the cooled material III into the airtight packaging device 4 along with the conveying mesh belt 502 from the system discharge end section, and completing weighing and packaging of the material III in the airtight packaging device 4.
After detection, the following steps are obtained: in the step B, the water content of the material I is 10%; in the step C, the water content of the material II is 0.02%, and the impurity removal rate is 99.5%; in the step D, the water content of the material III is 0.02%.
Example 2
The polytetrafluoroethylene dispersion resin particle wet material drying system comprises a drying device 1, a impurity removing device 2, a low-temperature air cooling device 3 and a closed packaging device 4, wherein the drying device 1, the impurity removing device 2, the low-temperature air cooling device 3 and the closed packaging device 4 are sequentially connected through a mesh belt conveying device 5, the mesh belt conveying device 5 comprises a driving roller 501 and a conveying mesh belt 502, the driving roller 501 drives the conveying mesh belt 502 to move, and the conveying mesh belt 502 sequentially passes through the drying device 1, the impurity removing device 2, the low-temperature air cooling device 3 and the closed packaging device 4 to form a circulating conveying loop; a system feeding section 6 is arranged at the front side of a station of the drying device 1, the system feeding section 6 is arranged on a conveying mesh belt 502, a feeding conveying device 7 is arranged above the station of the system feeding section 6, and the feeding conveying device 7 is used for continuously inputting initial materials into the drying system; the rear side of the station of the low-temperature air cooling device 3 is provided with a system discharging section 8, the system discharging section 8 is arranged on the conveying mesh belt 502, the system discharging section 8 is connected with the airtight packaging device 4, and the airtight packaging device 4 receives dry materials output by the system.
Further, the drying device 1 comprises a drying device body 101, and a microwave energy leakage inhibitor I102 and a vertical air baffle I103 which are arranged on two sides of the drying device body 101, wherein the drying device body 101 is connected with a microwave generator 9, and a steam exhaust port 104 is arranged at the upper end of the drying device body 101; the drying device body 101 includes a metal housing including stainless steel or aluminum, which can prevent microwave leakage.
Further, the impurity removing device 2 comprises an impurity removing device body 201, and a microwave energy leakage inhibitor II 202 and a vertical air baffle II 203 which are arranged on two sides of the impurity removing device body 201, wherein the impurity removing device body 201 is connected with a microwave generator 9; the impurity removing device body 201 is internally provided with a mesh plate which comprises a mesh plate I204 and a mesh plate II 205, the mesh plate I204 is arranged at the top of the impurity removing device body 201, and the mesh plate II 205 is arranged at the bottom of the impurity removing device body 201; the upper end of the impurity removing device body 201 is provided with an air outlet cover 10, the air outlet cover 10 is provided with a steam outlet 11, the lower end of the impurity removing device body 201 is provided with an air inlet cover 12, and the air inlet cover 12 is provided with a steam inlet 13; the impurity removing device body 201 includes a metal housing, which includes stainless steel or aluminum, and prevents microwave leakage.
Further, the impurity removing device 2 is connected with a superheated steam circulating device 14, one end of the superheated steam circulating device 14 is connected with the steam outlet 11, and the other end is connected with the steam inlet 13; the superheated steam circulation device 14 comprises a steam purification device 1401, a steam circulation fan 1402 and a steam superheating furnace 1403, the steam purification device 1401, the steam circulation fan 1402 and the steam superheating furnace 1403 are sequentially connected through a steam conveying pipe 1404, and the impurity removal device 2, the steam purification device 1401, the steam circulation fan 1402 and the steam superheating furnace 1403 form a steam circulation closed circuit through the steam conveying pipe 1404.
Further, a tee I1405 and a tee II 1406 are arranged between the steam circulation fan 1402 and the steam superheating furnace 1403, the tee I1405 and the tee II 1406 are both arranged on the steam conveying pipe 1404, the tee I1405 is connected with an exhaust valve 15, and the tee II 1406 is connected with an inflation valve 16.
Further, the low-temperature air cooling device 3 includes a low-temperature air cooling device body 301 and vertical air baffles iii 302 disposed on two sides of the low-temperature air cooling device body 301, an air outlet 303 is disposed at an upper end of the low-temperature air cooling device body 301, and an air inlet 304 is disposed at a lower end of the low-temperature air cooling device body 301.
Further, the low-temperature air cooling device 3 is connected with a cold air circulating device 17, one end of the cold air circulating device 17 is connected with an air outlet 303, and the other end is connected with an air inlet 304; the cold air circulation device 17 comprises an air purification device 1701, an air circulation fan 1702 and an air cooling device 1703, wherein the air purification device 1701, the air circulation fan 1702 and the air cooling device 1703 are sequentially connected through an air conveying pipe 1704, and the cold air circulation device 3 forms a cold air circulation closed circuit with the air purification device 1701, the air circulation fan 1702 and the air cooling device 1703 through the air conveying pipe 1704.
A method for drying polytetrafluoroethylene dispersion resin particle wet materials comprises the following steps:
A. Feeding material
Using a feeding and conveying device 7 to supply polytetrafluoroethylene dispersion resin particle wet materials with the water content of 45% as initial materials, and uniformly distributing the materials on a conveying mesh belt 502 of a system feeding section 6;
B. microwave drying
The initial material supplied in the step A enters the drying device 1 through the conveying mesh belt 502, the initial material moves in the drying device 1 for 15min and is subjected to the action of microwaves for 15min, water in the initial material is vaporized into water vapor, the water naturally overflows from the vapor discharge port 104, and the temperature of the initial material during the drying period is controlled to be 100 ℃ to obtain a material I;
C. microwave, high-temperature superheated steam drying and impurity removal
B, conveying the dried material I in the step B into a impurity removing device 2 through a conveying mesh belt 502, enabling the material I to move in the impurity removing device 2 for 25min, enabling the material I to be subjected to the action of microwaves and high-temperature superheated steam for 25min, regulating and controlling the temperature in the impurity removing device 2 at the same time, enabling hydration gas in the material I to be water vapor, enabling impurities in the material I to be gasified, enabling the water vapor to enter an air outlet cover 10 through a mesh plate I204 together with the steam containing the impurities under the traction action of a steam circulating fan 1402, and enabling the water vapor to enter a superheated steam circulating device 14 through a steam outlet 11 on the air outlet cover 10; in the superheated steam circulation device 14, water vapor and impurity-containing steam sequentially pass through the steam purification device 1401, are cooled to 160 ℃, and remove mixed residual impurities in the material I to obtain superheated steam without impurities, the superheated steam enters the steam superheating furnace 1403 under the action of the steam circulation fan 1402, is heated to high-temperature superheated steam at 250 ℃ in the steam superheating furnace 1403, enters the air inlet cover 12 through the steam inlet 13, and is diffused into the impurity removal device 2 through the mesh plate II 205; in the impurity removing device 2, high-temperature superheated steam sequentially passes through a conveying mesh belt 502, a material I and a mesh plate I204 at a speed of 2.0m/s, and finally passes through a steam outlet 11 on an air outlet cover 10 to complete one-time circulation, and after continuous circulation for 25min, the material I is heated to 240 ℃ to obtain a material II;
D. Cooling
C, feeding the dried and decontaminated material II into a low-temperature air cooling device 3 along with a conveying mesh belt 502, and feeding the material II into the low-temperature air cooling device 3 for 25min to obtain a material III;
in the low-temperature air cooling device 3, the discharged air enters the cold air circulation device 17 through the air outlet 303; in the cold air circulation device 17, the discharged air is pulled by an air circulation fan 1702, filtered by an air purification device 1701, enters an air cooling device 1703 for cooling and dewatering to obtain clean dry and cold air at-15 ℃, the dry and cold air enters the low-temperature air cooling device 3 through an air inlet 304 at the speed of 2.0m/s, the material II is cooled, and meanwhile, the dry and cold air is heated and then discharged through an air outlet 303, once circulation is completed, and after the continuous circulation is carried out for 25min, the material II is cooled to 19 ℃ to obtain a material III;
E. sealed package
And D, conveying the cooled material III into the airtight packaging device 4 along with the conveying mesh belt 502 from the system discharge end section, and completing weighing and packaging of the material III in the airtight packaging device 4.
After detection, the following steps are obtained: in the step B, the water content of the material I is 5%; in the step C, the water content of the material II is 0.007%, and the impurity removal rate is 99.8%; in the step D, the water content of the material III is 0.006%.
Example 3
As shown in fig. 1: the polytetrafluoroethylene dispersion resin particle wet material drying system comprises a drying device 1, a impurity removing device 2, a low-temperature air cooling device 3 and a closed packaging device 4, wherein the drying device 1, the impurity removing device 2, the low-temperature air cooling device 3 and the closed packaging device 4 are sequentially connected through a mesh belt conveying device 5, the mesh belt conveying device 5 comprises a driving roller 501 and a conveying mesh belt 502, the driving roller 501 drives the conveying mesh belt 502 to move, and the conveying mesh belt 502 sequentially passes through the drying device 1, the impurity removing device 2, the low-temperature air cooling device 3 and the closed packaging device 4 to form a circulating conveying loop; a system feeding section 6 is arranged at the front side of a station of the drying device 1, the system feeding section 6 is arranged on a conveying mesh belt 502, a feeding conveying device 7 is arranged above the station of the system feeding section 6, and the feeding conveying device 7 is used for continuously inputting initial materials into the drying system; the rear side of the station of the low-temperature air cooling device 3 is provided with a system discharging section 8, the system discharging section 8 is arranged on the conveying mesh belt 502, the system discharging section 8 is connected with the airtight packaging device 4, and the airtight packaging device 4 receives dry materials output by the system.
Further, the drying device 1 comprises a drying device body 101, and a microwave energy leakage inhibitor I102 and a vertical air baffle I103 which are arranged on two sides of the drying device body 101, wherein the drying device body 101 is connected with a microwave generator 9, and a steam exhaust port 104 is arranged at the upper end of the drying device body 101; the drying device body 101 includes a metal housing including stainless steel or aluminum, which can prevent microwave leakage.
Further, the impurity removing device 2 comprises an impurity removing device body 201, and a microwave energy leakage inhibitor II 202 and a vertical air baffle II 203 which are arranged on two sides of the impurity removing device body 201, wherein the impurity removing device body 201 is connected with a microwave generator 9; the impurity removing device body 201 is internally provided with a mesh plate which comprises a mesh plate I204 and a mesh plate II 205, the mesh plate I204 is arranged at the top of the impurity removing device body 201, and the mesh plate II 205 is arranged at the bottom of the impurity removing device body 201; the upper end of the impurity removing device body 201 is provided with an air outlet cover 10, the air outlet cover 10 is provided with a steam outlet 11, the lower end of the impurity removing device body 201 is provided with an air inlet cover 12, and the air inlet cover 12 is provided with a steam inlet 13; the impurity removing device body 201 includes a metal housing, which includes stainless steel or aluminum, and prevents microwave leakage.
Further, the impurity removing device 2 is connected with a superheated steam circulating device 14, one end of the superheated steam circulating device 14 is connected with the steam outlet 11, and the other end is connected with the steam inlet 13; the superheated steam circulation device 14 comprises a steam purification device 1401, a steam circulation fan 1402 and a steam superheating furnace 1403, the steam purification device 1401, the steam circulation fan 1402 and the steam superheating furnace 1403 are sequentially connected through a steam conveying pipe 1404, and the impurity removal device and the 2 steam purification device 1401, the steam circulation fan 1402 and the steam superheating furnace 1403 form a steam circulation closed circuit through the steam conveying pipe 1404.
Further, a tee I1405 and a tee II 1406 are arranged between the steam circulation fan 1402 and the steam superheating furnace 1403, the tee I1405 and the tee II 1406 are both arranged on the steam conveying pipe 1404, the tee I1405 is connected with an exhaust valve 15, and the tee II 1406 is connected with an inflation valve 16.
Further, the low-temperature air cooling device 3 includes a low-temperature air cooling device body 301 and vertical air baffles iii 302 disposed on two sides of the low-temperature air cooling device body 301, an air outlet 303 is disposed at an upper end of the low-temperature air cooling device body 301, and an air inlet 304 is disposed at a lower end of the low-temperature air cooling device body 301.
Further, the low-temperature air cooling device 3 is connected with a cold air circulating device 17, one end of the cold air circulating device 17 is connected with an air outlet 303, and the other end is connected with an air inlet 304; the cold air circulation device 17 comprises an air purification device 1701, an air circulation fan 1702 and an air cooling device 1703, wherein the air purification device 1701, the air circulation fan 1702 and the air cooling device 1703 are sequentially connected through an air conveying pipe 1704, and the cold air circulation device 3 forms a cold air circulation closed circuit with the air purification device 1701, the air circulation fan 1702 and the air cooling device 1703 through the air conveying pipe 1704.
Further, the airtight packaging device 4 comprises a fully-closed shell, the shell can effectively prevent the inside of the packaging device from exchanging gas with the outside, and the airtight packaging device 4 has the functions of weighing and packaging.
Further, the conveying mesh belt 502 is made of polytetrafluoroethylene glass fiber.
A method for drying polytetrafluoroethylene dispersion resin particle wet materials comprises the following steps:
A. feeding material
Using a feeding and conveying device 7 to supply polytetrafluoroethylene dispersion resin particle wet materials with the water content of 40% as initial materials, and uniformly distributing the materials on a conveying mesh belt 502 of a system feeding section 6;
B. microwave drying
The initial material supplied in the step A enters the drying device 1 through the conveying mesh belt 502, the initial material moves in the drying device 1 for 10min and is subjected to the action of microwaves for 10min, water in the initial material is vaporized into water vapor, the water naturally overflows from the vapor discharge port 104, and the temperature of the initial material during the drying period is controlled to be 97 ℃ to obtain a material I;
C. microwave, high-temperature superheated steam drying and impurity removal
B, conveying the dried material I in the step B into a impurity removing device 2 through a conveying mesh belt 502, enabling the material I to move in the impurity removing device 2 for 18min, enabling the material I to be subjected to the action of microwaves and high-temperature superheated steam for 18min, regulating and controlling the temperature in the impurity removing device 2 at 230 ℃, enabling hydration gas in the material I to be steam, gasifying impurities in the material I, enabling the steam to enter an air outlet cover 10 through a mesh plate I204 together with the steam containing the impurities under the traction action of a steam circulating fan 1402, and enabling the steam to enter a superheated steam circulating device 14 through a steam outlet 11 on the air outlet cover 10; in the superheated steam circulation device 14, water vapor and impurity-containing steam sequentially pass through the steam purification device 1401, are cooled to 140 ℃, and remove mixed residual impurities in the material I to obtain superheated steam without impurities, wherein the superheated steam enters the steam superheating furnace 1403 under the action of the steam circulation fan 1402, is heated to high-temperature superheated steam at 230 ℃ in the steam superheating furnace 1403, enters the air inlet cover 12 through the steam inlet 13, and is diffused into the impurity removal device 2 through the mesh plate II 205; in the impurity removing device 2, high-temperature superheated steam sequentially passes through a conveying mesh belt 502, a material I and a mesh plate I204 at the speed of 0.15m/s, and finally passes through a steam outlet 11 on an air outlet cover 10 to complete one-time circulation, and after 18min of continuous circulation, the material I is heated to 225 ℃ to obtain a material II;
D. Cooling
C, feeding the dried and decontaminated material II into a low-temperature air cooling device 3 along with a conveying mesh belt 502, and feeding the material II into the low-temperature air cooling device 3 for 18min to obtain a material III;
in the low-temperature air cooling device 3, the discharged air enters the cold air circulation device 17 through the air outlet 303; in the cold air circulation device 17, the discharged air is pulled by an air circulation fan 1702, filtered by an air purification device 1701, enters an air cooling device 1703 for cooling and dewatering to obtain clean dry and cold air at-22 ℃, the dry and cold air enters the low-temperature air cooling device 3 through an air inlet 304 at 0.15m/s, the material II is cooled, and meanwhile, the dry and cold air is heated and discharged through an air outlet 303, one-time circulation is completed, and after 18min of continuous circulation, the material II is cooled to 14 ℃ to obtain a material III;
E. sealed package
And D, conveying the cooled material III into the airtight packaging device 4 along with the conveying mesh belt 502 from the system discharge end section, and completing weighing and packaging of the material III in the airtight packaging device 4.
After detection, the following steps are obtained: in the step B, the water content of the material I is 7%; in the step C, the water content of the material II is 0.015 percent, and the impurity removal rate is 99.6 percent; in step D, the water content of material III was 0.014%.
Example 4
10kg of polytetrafluoroethylene dispersion resin particle wet material with 40% of water content is taken as a raw material, and the method comprises the following specific steps:
A. feeding material
10kg of polytetrafluoroethylene dispersion resin particle wet material is supplied as an initial material by a feeding and conveying device 7 and uniformly distributed on a conveying mesh belt 502 of a system feeding section 6;
B. microwave drying
Feeding 10kg of initial material supplied in the step A into a drying device 1 through a conveying mesh belt 502, enabling the initial material to move in the drying device 1 for 10min, enabling water in the initial material to be vaporized into steam under the action of microwaves for 10min, naturally overflowing from a steam outlet 104, controlling the temperature of the initial material to be 97 ℃ during drying, and obtaining 6.5kg of material I, wherein the water content of the material I is 7%;
C. microwave, high-temperature superheated steam drying and impurity removal
6.5kg of dried material I in the step B is conveyed into the impurity removing device 2 through the conveying mesh belt 502, the material I moves in the impurity removing device 2 for 18min and is subjected to the action of microwave and high-temperature superheated steam for 18min, meanwhile, the temperature in the impurity removing device 2 is regulated and controlled to be 230 ℃, hydration gas in the material I is steam, impurities in the material I are gasified, and under the traction action of the steam circulating fan 1402, the steam enters the air outlet cover 10 through the mesh plate I204 along with the steam containing the impurities, and then enters the superheated steam circulating device 14 through the steam outlet 11 on the air outlet cover 10; in the superheated steam circulation device 14, water vapor and impurity-containing steam sequentially pass through the steam purification device 1401, are cooled to 140 ℃, and remove mixed residual impurities in the material I to obtain superheated steam without impurities, wherein the superheated steam enters the steam superheating furnace 1403 under the action of the steam circulation fan 1402, is heated to high-temperature superheated steam at 230 ℃ in the steam superheating furnace 1403, enters the air inlet cover 12 through the steam inlet 13, and is diffused into the impurity removal device 2 through the mesh plate II 205; in the impurity removing device 2, high-temperature superheated steam sequentially passes through a conveying mesh belt 502, a material I and a mesh plate I204 at the speed of 0.15m/s, and finally passes through a steam outlet 11 on an air outlet cover 10 to complete one-time circulation, after 18min of continuous circulation, the material I is heated to 225 ℃ to obtain a material II of 6kg, the water content of the material II is 0.016, and the impurity removal rate is 99.5%;
D. Cooling
C, 6kg of dried and decontaminated material II enters a low-temperature air cooling device 3 along with a conveying mesh belt 502, and the material II moves in the low-temperature air cooling device 3 for 18min to obtain 6kg of material III, wherein the water content of the material III is 0.015%;
in the low-temperature air cooling device 3, the discharged air enters the cold air circulation device 17 through the air outlet 303; in the cold air circulation device 17, the discharged air is pulled by an air circulation fan 1702, filtered by an air purification device 1701, enters an air cooling device 1703 for cooling and dewatering to obtain clean dry and cold air at-22 ℃, the dry and cold air enters the low-temperature air cooling device 3 through an air inlet 304 at 0.15m/s, the material II is cooled, and meanwhile, the dry and cold air is heated and discharged through an air outlet 303, one-time circulation is completed, and after 18min of continuous circulation, the material II is cooled to 14 ℃ to obtain a material III;
E. sealed package
And D, conveying 6kg of cooled material III into the airtight packaging device 4 along with the conveying mesh belt 502 from the system discharge end section, and completing weighing and packaging of the material III in the airtight packaging device 4.
Example 5
Taking 20kg of polytetrafluoroethylene dispersion resin particle wet material with the water content of 45% as a raw material, and drying, wherein the specific steps are as follows:
A. Feeding material
20kg of polytetrafluoroethylene dispersion resin particle wet material is supplied as an initial material by a feeding and conveying device 7 and uniformly distributed on a conveying mesh belt 502 of a system feeding section 6;
B. microwave drying
The 20kg of initial material supplied in the step A enters the drying device 1 through the conveying mesh belt 502, the initial material moves in the drying device 1 for 15min and is subjected to the action of microwaves for 15min, water in the initial material is vaporized into water vapor, the water vapor naturally overflows from the vapor discharge port 104, the temperature of the initial material during the drying period is controlled to be 100 ℃, 10.5kg of material I is obtained, and the water content of the material I is 5%;
C. microwave, high-temperature superheated steam drying and impurity removal
10.5kg of the dried material I in the step B is conveyed into the impurity removing device 2 through the conveying mesh belt 502, the material I moves in the impurity removing device 2 for 25min and is subjected to the action of microwave and high-temperature superheated steam for 25min, meanwhile, the temperature in the impurity removing device 2 is regulated and controlled to be 250 ℃, the hydration gas in the material I is water vapor, impurities in the material I are gasified, and under the traction action of the steam circulating fan 1402, the water vapor enters the air outlet cover 10 through the mesh plate I204 along with the steam containing the impurities, and then enters the superheated steam circulating device 14 through the steam outlet 11 on the air outlet cover 10; in the superheated steam circulation device 14, water vapor and impurity-containing steam sequentially pass through the steam purification device 1401, are cooled to 160 ℃, and remove mixed residual impurities in the material I to obtain superheated steam without impurities, the superheated steam enters the steam superheating furnace 1403 under the action of the steam circulation fan 1402, is heated to high-temperature superheated steam at 250 ℃ in the steam superheating furnace 1403, enters the air inlet cover 12 through the steam inlet 13, and is diffused into the impurity removal device 2 through the mesh plate II 205; in the impurity removing device 2, high-temperature superheated steam sequentially passes through a conveying mesh belt 502, a material I and a mesh plate I204 at a speed of 2.0m/s, and finally passes through a steam outlet 11 on an air outlet cover 10 to complete one-time circulation, after continuous circulation for 25min, the material I is heated to 240 ℃ to obtain a material II of 10kg, the water content of the material II is 0.007%, and the impurity removal rate is 99.8%
D. Cooling
C, drying and removing 10kg of impurities, wherein a material II enters a low-temperature air cooling device 3 along with a conveying mesh belt 502, and the material II moves in the low-temperature air cooling device 3 for 25min to obtain 10kg of a material III, wherein the water content of the material III is 0.006%;
in the low-temperature air cooling device 3, the discharged air enters the cold air circulation device 17 through the air outlet 303; in the cold air circulation device 17, the discharged air is pulled by an air circulation fan 1702, filtered by an air purification device 1701, enters an air cooling device 1703 for cooling and dewatering to obtain clean dry and cold air at-15 ℃, the dry and cold air enters the low-temperature air cooling device 3 through an air inlet 304 at the speed of 2.0m/s, the material II is cooled, and meanwhile, the dry and cold air is heated and then discharged through an air outlet 303, once circulation is completed, and after the continuous circulation is carried out for 25min, the material II is cooled to 19 ℃ to obtain a material III;
E. sealed package
And D, conveying 10kg of cooled material III into the airtight packaging device 4 along with the conveying mesh belt 502 from the system discharge end section, and completing weighing and packaging of the material III in the airtight packaging device 4.
Example 6
Taking 50kg of polytetrafluoroethylene dispersion resin particle wet material with water content of 50% as a raw material, and drying the wet material, wherein the specific steps are as follows:
A. Feeding material
50kg of polytetrafluoroethylene dispersion resin particle wet material is supplied as an initial material by a feeding and conveying device 7 and uniformly distributed on a conveying mesh belt 502 of a system feeding section 6;
B. microwave drying
Introducing 50kg of initial material supplied in the step A into a drying device 1 through a conveying mesh belt 502, allowing the initial material to move in the drying device 1 for 5min, allowing water in the initial material to be vaporized into water vapor under the action of microwaves for 5min, naturally overflowing from a vapor outlet 104, controlling the temperature of the initial material to 90 ℃ during drying, and obtaining 27.7kg of material I with the water content of 10%;
C. microwave, high-temperature superheated steam drying and impurity removal
B, transferring 27.7kg of dried material I in the step B into a impurity removing device 2 through a conveying mesh belt 502, enabling the material I to move in the impurity removing device 2 for 10min, enabling the material I to be subjected to the action of microwave and high-temperature superheated steam for 10min, regulating and controlling the temperature in the impurity removing device 2 at 200 ℃, enabling hydration gas in the material I to be steam, gasifying impurities in the material I, enabling the steam to enter an air outlet cover 10 through a mesh plate I204 together with the steam containing the impurities under the traction action of a steam circulating fan 1402, and enabling the steam to enter a superheated steam circulating device 14 through a steam outlet 11 on the air outlet cover 10; in the superheated steam circulation device 14, water vapor and impurity-containing steam sequentially pass through the steam purification device 1401, are cooled to 120 ℃, and remove mixed residual impurities in the material I to obtain superheated steam without impurities, wherein the superheated steam enters the steam superheating furnace 1403 under the action of the steam circulation fan 1402, is heated to high-temperature superheated steam with the temperature of 200 ℃ in the steam superheating furnace 1403, enters the air inlet cover 12 through the steam inlet 13, and is diffused into the impurity removal device 2 through the mesh plate II 205; in the impurity removing device 2, high-temperature superheated steam sequentially passes through a conveying mesh belt 502, a material I and a mesh plate I204 at a speed of 0.1m/s, and finally passes through a steam outlet 11 on an air outlet cover 10 to complete one-time circulation, after continuous circulation for 10min, the material I is heated to 195 ℃ to obtain 25kg of a material II, the water content of the material II is 0.02%, and the impurity removal rate is 99.5%;
D. Cooling
C, 25kg of dried and decontaminated material II enters a low-temperature air cooling device 3 along with a conveying mesh belt 502, and the material II moves in the low-temperature air cooling device 3 for 10min to obtain 25kg of material III, wherein the water content of the material III is 0.02%;
in the low-temperature air cooling device 3, the discharged air enters the cold air circulation device 17 through the air outlet 303; in the cold air circulation device 17, the discharged air is pulled by an air circulation fan 1702, filtered by an air purification device 1701, enters an air cooling device 1703 for cooling and dewatering to obtain clean dry and cold air at-30 ℃, the dry and cold air enters the low-temperature air cooling device 3 through an air inlet 304 at 0.1m/s, the material II is cooled, and meanwhile, the dry and cold air is heated and discharged through an air outlet 303, one-time circulation is completed, and after continuous circulation for 10min, the material II is cooled to 10 ℃ to obtain a material III;
E. sealed package
And D, conveying 25kg of cooled material III into the airtight packaging device 4 along with the conveying mesh belt 502 from the system discharge end section, and completing weighing and packaging of the material III in the airtight packaging device 4.
Example 7
Taking 100kg of polytetrafluoroethylene dispersion resin particle wet material with water content of 60% as a raw material, and drying the wet material, wherein the specific steps are as follows:
A. Feeding material
100kg of polytetrafluoroethylene dispersion resin particle wet material is supplied as an initial material by a feeding and conveying device 7 and uniformly distributed on a conveying mesh belt 502 of a system feeding section 6;
B. microwave drying
C, feeding 100kg of initial materials fed in the step A into a drying device 1 through a conveying mesh belt 502, enabling the initial materials to move in the drying device 1 for 8min, enabling water in the initial materials to be vaporized into water vapor under the action of microwaves for 8min, naturally overflowing from a vapor outlet 104, controlling the temperature of the initial materials to be 95 ℃ during drying, and obtaining 43.5kg of materials I with the water content of 8%;
C. microwave, high-temperature superheated steam drying and impurity removal
The method comprises the steps that 43.5kg of materials I after drying in the step B are conveyed into a impurity removing device 2 through a conveying mesh belt 502, the materials I move for 20min in the impurity removing device 2 and are subjected to the action of microwave and high-temperature superheated steam for 20min, meanwhile, the temperature in the impurity removing device 2 is regulated and controlled, the control temperature is 220 ℃, hydration gas in the materials I is water vapor, impurities in the materials I are gasified, and under the traction action of a steam circulating fan 1402, the water vapor enters an air outlet cover 10 through a mesh plate I204 along with the steam containing the impurities, and then enters a superheated steam circulating device 14 through a steam outlet 11 on the air outlet cover 10; in the superheated steam circulation device 14, water vapor and impurity-containing steam sequentially pass through the steam purification device 1401, are cooled to 150 ℃, and remove mixed residual impurities in the material I to obtain superheated steam without impurities, wherein the superheated steam enters the steam superheating furnace 1403 under the action of the steam circulation fan 1402, is heated to be high-temperature superheated steam with the temperature of 200-250 ℃ in the steam superheating furnace 1403, enters the air inlet cover 12 through the steam inlet 13, and is diffused into the impurity removal device 2 through the mesh plate II 205; in the impurity removing device 2, high-temperature superheated steam sequentially passes through a conveying mesh belt 502, a material I and a mesh plate I204 at the speed of 0.18m/s, and finally passes through a steam outlet 11 on an air outlet cover 10 to complete one-time circulation, after continuous circulation for 20min, the material I is heated to 210 ℃ to obtain 40kg of material II, the water content of the material II is 0.01%, and the impurity removal rate is 99.55%;
D. Cooling
And C, drying and removing impurities, wherein 40kg of a material II enters the low-temperature air cooling device 3 along with the conveying mesh belt 502, and the material II moves in the low-temperature air cooling device 3 for 18min to obtain 40kg of a material III, wherein the water content of the material III is 0.009%.
In the low-temperature air cooling device 3, the discharged air enters the cold air circulation device 17 through the air outlet 303; in the cold air circulation device 17, the discharged air is pulled by an air circulation fan 1702, filtered by an air purification device 1701, enters an air cooling device 1703 for cooling and dewatering to obtain clean dry and cold air at-22 ℃, the dry and cold air enters the low-temperature air cooling device 3 through an air inlet 304 at 0.13m/s, the material II is cooled, and meanwhile, the dry and cold air is heated and discharged through an air outlet 303, one-time circulation is completed, and after 19min of continuous circulation, the material II is cooled to 14 ℃ to obtain a material III;
E. sealed package
And D, conveying 40kg of cooled material III into the airtight packaging device 4 along with the conveying mesh belt 502 from the system discharge end section, and completing weighing and packaging of the material III in the airtight packaging device 4.
Example 8
Based on examples 1 to 7, the polytetrafluoroethylene dispersion after the drying process was examined for tensile strength by the standard HGT 3028-1999, compared with the conventional method (oven drying), and the results are shown in the following table:
Figure 562115DEST_PATH_IMAGE001
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Claims (10)

1. A polytetrafluoroethylene dispersion resin particle wet material drying system is characterized in that: the device comprises a drying device (1), a impurity removing device (2), a low-temperature air cooling device (3) and a closed packaging device (4), wherein the drying device (1), the impurity removing device (2), the low-temperature air cooling device (3) and the closed packaging device (4) are sequentially connected through a mesh belt conveying device (5), the mesh belt conveying device (5) comprises a driving roller (501) and a conveying mesh belt (502), the driving roller (501) drives the conveying mesh belt (502) to move, and the conveying mesh belt (502) sequentially passes through the drying device (1), the impurity removing device (2), the low-temperature air cooling device (3) and the closed packaging device (4) to form a circulating conveying loop;
a system feeding section (6) is arranged at the front side of a station of the drying device (1), the system feeding section (6) is arranged on a conveying mesh belt (502), and a feeding conveying device (7) is arranged above the station of the system feeding section (6);
the rear side of the station of the low-temperature air cooling device (3) is provided with a system discharging section (8), the system discharging section (8) is arranged on a conveying mesh belt (502), and the system discharging section (8) is connected with a closed packaging device (4);
wherein the drying device (1): the microwave energy leakage inhibitor comprises a drying device body (101), microwave energy leakage inhibitors I (102) and vertical air baffles I (103) which are arranged on two sides of the drying device body (101), wherein the drying device body (101) is connected with a microwave generator (9), and a steam exhaust port (104) is arranged at the upper end of the drying device body (101);
The impurity removing device (2): comprises a impurity removing device body (201), a microwave energy leakage inhibitor II (202) and a vertical air baffle II (203) which are arranged at two end sides of the impurity removing device body (201), wherein the impurity removing device body (201) is connected with a microwave generator (9); the impurity removing device (2) is connected with a superheated steam circulating device (14);
the low-temperature air cooling device (3) comprises: the air conditioner comprises a low-temperature air cooling device body (301) and vertical air baffles III (302) arranged on two sides of the low-temperature air cooling device body (301); and the low-temperature air cooling device (3) is connected with a cold air circulation device (17).
2. The drying system of claim 1, wherein: the drying device body (101) comprises a metal housing.
3. The drying system of claim 1, wherein: the impurity removing device comprises a impurity removing device body (201), wherein a mesh plate is arranged in the impurity removing device body (201), the mesh plate comprises a mesh plate I (204) and a mesh plate II (205), the mesh plate I (204) is arranged at the top of the impurity removing device body (201), and the mesh plate II (205) is arranged at the bottom of the impurity removing device body (201); the upper end of the impurity removing device body (201) is provided with an air outlet cover (10), the air outlet cover (10) is provided with a steam outlet (11), the lower end of the impurity removing device body (201) is provided with an air inlet cover (12), and the air inlet cover (12) is provided with a steam inlet (13); the impurity removing device body (201) includes a metal housing.
4. The drying system of claim 1, wherein: one end of the superheated steam circulation device (14) is connected with the steam outlet (11), and the other end is connected with the steam inlet (13); the superheated steam circulation device (14) comprises a steam purification device (1401), a steam circulation fan (1402) and a steam superheating furnace (1403), the steam purification device (1401), the steam circulation fan (1402) and the steam superheating furnace (1403) are sequentially connected through a steam conveying pipe (1404), and the impurity removal device (2) and the steam purification device (1401), the steam circulation fan (1402) and the steam superheating furnace (1403) form a steam circulation closed circuit through the steam conveying pipe (1404).
5. The drying system of claim 4, wherein: be equipped with tee bend I (1405) and tee bend II (1406) between steam circulation fan (1402) and steam superheating stove (1403), tee bend I (1405) and tee bend II (1406) all set up on steam delivery pipe (1404), and tee bend I (1405) even have discharge valve (15), tee bend II (1406) even have inflation valve (16).
6. The drying system of claim 1, wherein: the low-temperature air cooling device is characterized in that an air outlet (303) is formed in the upper end of the low-temperature air cooling device body (301), and an air inlet (304) is formed in the lower end of the low-temperature air cooling device body.
7. The drying system of claim 1, wherein: one end of the cold air circulation device (17) is connected with the air outlet (303), and the other end of the cold air circulation device is connected with the air inlet (304); the cold air circulation device (17) comprises an air purification device (1701), an air circulation fan (1702) and an air cooling device (1703), wherein the air purification device (1701), the air circulation fan (1702) and the air cooling device (1703) are sequentially connected through an air conveying pipe (1704), and the low-temperature air cooling device (3) and the air purification device (1701), the air circulation fan (1702) and the air cooling device (1703) form a cold air circulation closed circuit through the air conveying pipe (1704).
8. The drying system of claim 1, wherein: the closed packaging device (4) comprises a totally-enclosed shell.
9. The drying system of claim 1, wherein: the conveying mesh belt (502) is made of polytetrafluoroethylene glass fiber materials.
10. A method for drying polytetrafluoroethylene dispersion resin particles wet material according to any one of claims 1-9, comprising the steps of:
A. feeding material
Feeding polytetrafluoroethylene dispersion resin particle wet materials serving as initial materials by a feeding conveying device (7) and uniformly distributing the initial materials on a conveying mesh belt (502) of a system feeding section (6);
B. Microwave drying
The initial material supplied in the step A enters a drying device (1) along with a conveying mesh belt (502), the initial material moves for 5-15min in the drying device (1), meanwhile, the water in the initial material is converted into steam under the action of microwaves for 5-15min, the steam naturally overflows from a steam outlet (104), and the temperature of the initial material in the drying period is controlled to be less than or equal to 100 ℃ to obtain a material I;
C. microwave, high-temperature superheated steam drying and impurity removal
B, conveying the dried material I in the step B into a impurity removing device (2) through a conveying mesh belt (502), enabling the material I to move in the impurity removing device (2) for 10-25min, enabling the material I to be subjected to the action of microwaves and high-temperature superheated steam for 10-25min, regulating and controlling the temperature in the impurity removing device (2), controlling the temperature to be 200-250 ℃, enabling hydration gas in the material I to be steam, gasifying impurities in the material I, enabling the steam to enter an air outlet cover (10) through a mesh plate I (204) together with steam containing the impurities under the traction action of a steam circulating fan (1402), and enabling the steam to enter a superheated steam circulating device (14) through a steam outlet (11) on the air outlet cover (10); in a superheated steam circulation device (14), water vapor and impurity-containing steam sequentially pass through a steam purification device (1401), are cooled to 120-160 ℃, residual impurities mixed in a material I are removed, superheated steam without impurities is obtained, the superheated steam enters a steam superheating furnace (1403) under the action of a steam circulation fan (1402), the superheated steam is heated to be high-temperature superheated steam with the temperature of 200-250 ℃ in the steam superheating furnace (1403), the high-temperature superheated steam enters an air inlet cover (12) through a steam inlet (13), and is diffused into an impurity removal device (2) through a mesh plate II (205); in the impurity removing device (2), high-temperature superheated steam sequentially passes through a conveying mesh belt (502), a material I and a mesh plate I (204) at the speed of 0.1-2.0m/s, and finally passes through a steam outlet (11) on an air outlet cover (10) to complete one-time circulation, and after continuous circulation for 10-25min, the material I is heated to 195-240 ℃ to obtain a material II;
D. Cooling
C, feeding the dried and decontaminated material II into a low-temperature air cooling device (3) along with a conveying mesh belt (502), and feeding the material II into the low-temperature air cooling device (3) for 10-25min to obtain a material III;
in the low-temperature air cooling device (3), the discharged air enters the cold air circulation device (17) through the air outlet (303); in the cold air circulation device (17), the discharged air is pulled by an air circulation fan (1702), filtered by an air purification device (1701), enters an air cooling device (1703) for cooling and dewatering to obtain clean dry and cold air at-30 to-15 ℃, the dry and cold air enters a low-temperature air cooling device (3) through an air inlet (304) at 0.1 to 2.0m/s to cool a material II, and meanwhile, the dry and cold air is heated and then discharged through an air outlet (303), one-time circulation is completed, and after continuous circulation for 10 to 25min, the material II is cooled to 10 to 19 ℃ to obtain a material III;
E. sealed package
And D, conveying the cooled material III to a closed packaging device (4) along with a conveying mesh belt (502) from a system discharge end section, and weighing and packaging the material III in the closed packaging device (4).
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