CN214665811U - Superheated steam disc type dryer - Google Patents

Abstract

The utility model relates to an overheated steam disk desiccator includes dry storehouse, steam fan, motor, circulating fan, steam pipe, heating device, dry dish, transmission shaft, harrow pole device, exhaust apparatus. The hot air enters the drying bin through the heat energy inlet of the drying bin, and the metal plate surface of the drying disc cannot deform under the heat transfer effect of the hot air. The superheated steam carries out closed-loop circulating convection heat and mass transfer on the materials on the drying plate, the materials also obtain heat energy conduction heat transfer of the plate body of the drying plate, and double heat transfer drying of circulating flow drying and conduction drying of the materials is realized, so that the heat transfer rate and the mass transfer efficiency of the materials are improved. Circulating flow gas in the drying bin is condensable superheated steam in the material drying process, an air boundary layer is not arranged on the surface of the material, mass transfer resistance can be ignored, and the drying speed of the material is accelerated.

Description

Superheated steam disc type dryer

Technical Field

The utility model relates to a disk dryer, especially an overheated steam disk dryer.

Background

The disc type dryer mainly comprises a large drying disc, a small drying disc, a transmission shaft, a rake lever device, a feeding and discharging device and the like, and the working principle of the disc type dryer mainly comprises the steps that wet materials are added into the dryer through the upper part, the wet materials fall into the large drying disc on the lower part from the periphery of the small drying disc under the rotary pushing action of a rake, the materials fall into the small drying disc on the lower part from the center of the large drying disc under the rotary pushing action of the rake on the large drying disc, and the materials are dried in such a circulating mode.

1. All there is the heat source in the big or small drying tray of current, and the drying tray makes the drying tray that generates heat take place various deformations very easily under long-term high temperature effect and above-mentioned material and harrow leaf to its effort that produces, and the effect greatly reduced of drying tray of deformation also can make the harrow for the harrow can not be fine pick up and strike off the material on the drying tray, leads to the material to remain for a long time and the adhesion produces the paste piece on the drying tray.

2. The existing disc type drying machine utilizes heat energy in a drying disc to evaporate moisture in materials on the drying disc to be dry, so that the water vapor is discharged from the upper part of the drying machine, at the moment, the water vapor is easy to condense when the saturated vapor is cooled, and the moisture at the bottom is recombined with the materials on the drying disc in the rising process to cause the dried materials to be damp again, so that the drying time of the drying machine is prolonged, and the efficiency of the drying machine is reduced.

3. The heat source commonly used by the disc dryer is steam, most of the steam is directly discharged outwards after supplying heat to the disc dryer, the steam has considerable heat, energy waste is caused by direct discharge, and high-temperature moisture in the drying process of the disc dryer is also directly discharged, so that heat loss and water resource waste are caused.

4. The drying process of the existing disc type dryer adopts conduction drying, the heat energy in a drying disc is used for conducting and transferring heat to materials on the disc, the materials only attached to the disc body of the drying disc can be heated and heated in the drying process, the heat transfer rate of the heat energy in the drying disc to the materials is limited, and the drying speed of the materials is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of overcoming the defects in the prior art, the superheated steam disc type dryer is provided.

The utility model provides a technical scheme that its technical problem adopted is: a disk-type superheated steam drier comprises a drying bin, a motor, a steam fan, a circulating flow air guide device, a steam pipe, a heating device, a drying disk, a transmission shaft, a rake rod device and an exhaust device.

The drying bin is provided with a feeding hole, a discharging hole, an exhaust hole, a heat energy inlet and a heat energy outlet.

Present disc dryer's overall structure is ripe equipment, the utility model discloses innovated the improvement on present disc dryer's basis, there is the drying tray design of heat source inside to the metal sheet, has increased steam fan, circulating fan, steam pipe, heating device. The utility model discloses just not detailed and introduction to the integrated configuration and the operation of disk dryer.

The drying bin is fixed on the ground through a support. According to the dry technology requirement of disk dryer, because the utility model discloses a dry storehouse requires to be high airtight type, and the device of input and output material of installing on the feed inlet of dry storehouse and the discharge gate is high airtight device of input and output material, or is the air seal machinery, or is screw feeder, or is vacuum discharge apparatus. The feeding and discharging device reduces the air outside the drying bin from entering the drying bin in the process of conveying materials. The feeding and discharging devices are arranged on the discharge port and the feed port of the drying bin, materials can continuously enter and exit the drying bin through the high air tightness of the feeding and discharging devices, the materials can be continuously dried, the drying efficiency of the materials is improved, and the drying effect of the materials is optimized.

The transmission shaft penetrates through a bearing device arranged on a drying bin body and enters the drying bin, and the transmission shaft penetrates through a middle hole of the small drying tray; the bearing device supports and supports the transmission shaft, and the stability of the transmission shaft is guaranteed. The joint of the transmission shaft and the drying cabin body is fixedly sealed by a sealing device outside the cabin. The transmission shaft is dynamically sealed by the sealing device in the rotating process, and air outside the drying bin can not enter the drying bin through the connecting part of the transmission shaft and the drying bin body during vacuum drying of materials.

A plurality of groups of harrow bar devices are fixedly arranged on a transmission shaft in the drying bin, and one group of harrow bar devices corresponds to one drying disc. The harrow bar device comprises a fixed frame, a harrow bar, harrow blades and a guide plate. The motor is installed at the upper end or the lower end of the drying bin and is fixed on the bin body of the drying bin through the support. The motor is connected with the transmission shaft, the motor drives the transmission shaft to rotate, the harrow bar device and the transmission shaft rotate together, the harrow blades rotate along the disc surface of the drying disc under the driving of the harrow bar, and the materials on the drying disc are gathered into an asymmetrical annular material pile along the side edges of the harrow blades under the guiding and guiding effects of the harrow blades. The utility model discloses a motor, transmission shaft, harrow pole device and conventional integrated configuration, mounting method and theory of operation are the same.

The drying tray comprises a metal plate and a bracket; the bracket is angle iron or channel steel; the thickness of the metal plate is 1 to 18 mm. The metal plate is a flat metal plate or a metal plate with air holes, so that the tray body of the drying tray is an airtight tray body or a tray body with air holes. The metal plate is cut and welded into a disc body which is suitable for the size of the drying bin and is in a suitable shape, the metal plate is arranged on the support, the metal plate is supported and fixed by the supports, the metal plate is supported by the support, and the flatness of the disc surface of the disc body of the drying disc is achieved. The metal plate surface of the drying plate can not deform under the heat transfer action of the superheated steam. The drying tray comprises a large drying tray and a small drying tray. The manner, angle, position of the fixed mounting of the drying tray is the same as in a conventional tray dryer.

And the exhaust device on the exhaust port of the drying bin exhausts gas generated by gasification when the materials in the drying bin are dried. The exhaust device is a vacuum unit, or a vacuum pump, or a Roots blower, or a blower, or an air release valve. According to different use requirements, a corresponding proper exhaust device is selected.

The steam fan is arranged on a heat energy outlet of the drying bin, moisture and superheated steam in the drying bin are discharged from the heat energy outlet of the drying bin under the pumping and discharging action of the steam fan and enter the heating device through the steam pipe to be heated in a heat transfer mode, the heated superheated steam enters the drying bin through a heat energy inlet of the drying bin, and the superheated steam carries out closed-loop convection heat transfer and mass transfer on materials in the drying bin. The tray body of the drying tray obtains the heat transfer of the superheated steam, and the heat energy on the tray body of the drying tray transfers the heat to the materials on the drying tray.

The heating device is a boiler, or a heat pump, or a combustion furnace, or an electric heater, or a burner, or an electromagnetic heater, or a ceramic heating plate, or an electric heating wire; different heating devices can be selected according to the requirements of equipment cost, environmental protection and the like.

The superheated steam is used as a drying medium, the superheated steam is a heat carrier and a mass carrier, and the whole drying stage is in a dynamic change and finally reaches a balancing process. Superheated steam and materials in the drying bin flow dynamically, the superheated steam is in full contact with the materials in the annular material pile on the drying disc, and the materials in the annular material pile are in a three-dimensional state. Superheated steam of the circulating flow in the drying bin penetrates through pores among the annular material piles of the materials, the superheated steam enhances the convection heat transfer with the materials in the annular material piles, and the superheated steam transfers the carried heat energy to wet materials and the drying tray through the convection heat transfer and mass transfer diffusion effects between the superheated steam and the materials, meanwhile, moisture in the wet materials absorbs heat, is vaporized and diffused, is carried away by the steam, and conducts heat transfer, mass transfer and drying on the materials.

The material drying of the drying bin is divided into a preheating section and a drying section. The temperature of the superheated steam of the preheating section at the upper end of the drying bin is low, and the low-temperature superheated steam after heat dissipation is discharged out of the drying bin through an exhaust device or enters a heating device through a steam pipe through a steam fan for heating; the superheated steam temperature of the drying section is high, and the superheated steam can be used in a circulating flow of the drying bin under the action of the circulating fan, so that the effective utilization rate of the heat energy of the superheated steam is improved.

Superheated steam and materials in the drying bin interact and supplement each other. The water source of the superheated steam is the moisture generated during the drying of the materials, the moisture becomes the superheated steam after being heated by the heat energy generated by the heating device, and the materials in the drying bin are subjected to heat transfer by the heat energy of the superheated steam conducted on the drying tray and heat transfer and mass transfer by the superheated steam. The drying bin body and the drying tray are provided with high-temperature heat energy conducted by superheated steam, and the condensation and dewing phenomena of moisture generated during material drying can not occur on the drying bin body and the drying tray.

The circulating flow air guide device comprises a circulating fan and an air guide pipe; the circulating flow air guide device is arranged on the drying cabin body. The circulating fan is a pipeline fan or a centrifugal fan. The circulating fan is arranged in the air duct pipe or between the two air ducts. According to the temperature in the drying bin, the circulating fan is arranged in the drying bin or outside the drying bin. The circulating air outlet and the circulating air inlet of the air guide pipe are arranged in the drying bin, the circulating air inlet of the air guide pipe is arranged above the circulating air outlet, superheated steam above the drying bin is pumped and exhausted by the circulating fan and guided to the lower side of the drying bin, and the superheated steam is circulated and convected in the drying bin. The connection part of the air duct and the drying cabin body is fixedly sealed, and the connection part of the air duct and the drying cabin body is sealed and airtight.

Preheating the drying bin: 1. 10-50 kg of water can be added to the heating device, heat energy generated by the heating device conducts heat transfer and heating on 10-50 kg of water to produce superheated steam, the water source of the superheated steam used again is moisture generated during material drying, and the water resource is saved. 2. Or water is not added in the heating device, the superheated steam directly utilizes the moisture generated during the material drying as a water source, the moisture generated during the material drying is heated by the heat energy generated by the heating device to form the superheated steam, and the temperature of the superheated steam is controlled by the heat energy generated by the heating device in a heat transfer manner.

The utility model discloses superheated steam disc drier's material superheated steam drying process as follows:

step one, starting a heating device and an exhaust device to preheat a drying bin. The relative pressure in the drying bin is controlled by the exhaust device, in the preheating process of the gas in the drying bin, the non-condensable gas air is exhausted out of the drying bin along with the moisture of the condensable gas under the pumping and exhausting action of the exhaust device, and the heating device conducts circulating heat conduction and heating on the superheated steam in the drying bin. The in-process of business turn over material device having reduced the air outside the dry storehouse and having got into dry storehouse, the preheating in dry storehouse is after 5 ~ 18 minutes, leak during the business turn over material and get into a small amount of air in dry storehouse when exhausting, the inside gas in dry storehouse is under exhaust apparatus's pump drainage effect, the moisture is carrying the air and can be discharged dry storehouse, the noncondensable gas that exists in the dry storehouse is less and less, the superheated steam of condensable gas is more and more, be full of superheated steam in the dry storehouse until.

Superheated steam heated by the heating device enters the drying bin through a heat energy inlet of the drying bin, the superheated steam on the small drying tray upwards enters materials on the tray body of the adjacent large drying tray from the outer edge of the small drying tray, the superheated steam enters the materials on the tray body of the adjacent large drying tray from the middle hole of the large drying tray, and the superheated steam carries out closed-loop convection heat and mass transfer on the materials on the large drying tray and the small drying tray which are alternately arranged up and down in the drying bin. The superheated steam in the drying bin carries the moisture generated when the materials are dried, and the moisture is discharged from the heat energy outlet of the drying bin under the pumping and discharging action of the steam fan, and the superheated steam and the moisture enter the heating device through the steam pipe to be heated again through heat transfer. The tray body of the drying tray obtains the heat transfer of the superheated steam, and the heat energy on the tray body of the drying tray transfers the heat to the materials on the drying tray. The superheated steam flows in the drying bin in a counter-current manner from bottom to top, and the superheated steam performs closed-loop circulating flow in the drying bin to perform counter-current drying on the materials.

The temperature of the material in the drying bin is controlled by the relative pressure in the bin and the temperature of the superheated steam. According to the requirements of heat sensitivity, quality, nutritional parameters and the like of the materials, the relative pressure in the drying bin is-0.095 MPa to 0.3 MPa. The superheated steam is used as a drying medium, the superheated steam is a heat carrier and a mass carrier, the superheated steam with the temperature of 80-280 ℃ is used as the drying medium, and the high-pressure superheated steam drying, the approximately atmospheric pressure superheated steam drying or the low-pressure superheated steam drying is carried out on the materials.

The gas exceeding the set relative pressure in the drying bin is exhausted through an exhaust device of an exhaust port of the drying bin, and the heat energy in the gas exhausted through the exhaust device in the drying bin is used for preheating the materials through a heat exchanger or is used for other purposes, so that the effects of energy conservation and emission reduction by utilizing the waste heat are achieved.

And step two, the feeding and discharging device reduces the air outside the drying bin from entering the drying bin in the process of conveying the materials, the materials to be dried are conveyed on the first layer of large drying plate on the upper part in the drying bin through the feeding and discharging device on the feeding hole of the drying bin, the motor drives the transmission shaft to rotate, the transmission shaft drives the rake rod device to rotate, the materials are displaced on the large drying plate and the small drying plate which are alternately arranged up and down in the drying bin in a downstream manner from top to bottom, and the materials are turned up and down under the action of the rake blades.

The metal plate surface of the drying plate can not deform under the heat transfer action of the superheated steam. The material flows through the disc surface of the large drying disc along the exponential spiral line under the pushing action of the harrow blades, and the material on the large drying disc moves inwards in a rotating way and falls onto the next layer of small drying disc from the middle hole; the material on the small drying disk is transferred to the outer edge of the small drying disk by the outward-rotating stirring guide flow and falls to the outer edge of the large drying disk below the small drying disk, so that the material can continuously flow through the whole drying bin in an inward-rotating or outward-rotating manner.

And step three, when less air leaked into the drying bin during feeding and discharging is discharged, the steam carrying the air is discharged out of the drying bin. The method comprises the following steps that moisture, air and superheated steam generated during drying of materials in a drying bin are discharged from a heat energy outlet of the drying bin under the pumping and discharging action of a steam fan and enter a heating device through a steam pipe to conduct heat transfer and heating, the heated superheated steam enters the drying bin through a heat energy inlet of the drying bin, and the superheated steam conducts closed-loop convection heat transfer and mass transfer on the materials in the drying bin.

And fourthly, under the action of a circulating fan, superheated steam in the drying bin enters the air guide tube from a circulating air inlet of the air guide tube, the superheated steam is discharged in the drying bin from a circulating air outlet of the air guide tube, the superheated steam above the drying bin is pumped and discharged to the lower side of the drying bin through the circulating fan 3, the superheated steam is circulated and convected in the drying bin, and heat energy carried by the superheated steam conducts heat conduction and heat transfer to a drying disc and materials in the drying bin. ,

the superheated steam under the pumping action of the circulating fan increases the circulating convection velocity in the drying bin. Superheated steam of the circulating flow in the drying bin penetrates through the material in the annular material pile and the pores among the materials, the superheated steam enhances the convection heat transfer with the material in the annular material pile, and the superheated steam carries out closed-loop circulating flow in the drying bin to dry the material in a heat and mass transfer mode.

And step five, discharging the dried materials in the drying bin out of the drying bin through a feeding and discharging device on a discharge hole of the drying bin.

The utility model discloses a be full of superheated steam in the dry storehouse among the material drying process, the circulating flow gas in the dry storehouse is the superheated steam of condensable nature, the material surface does not have air boundary layer, the mass transfer resistance can be neglected, the heat energy conduction that superheated steam carried is on the material, improve the kinetic energy of material surface and inside hydrone, destroy the cohesion of moisture and material, make during moisture gasification gets into superheated steam on every side for steam, realized superheated steam to the heat and mass transfer of material, the drying time has been shortened, the drying rate of material has been accelerated, thereby the material in the drying pan has reached the drying.

The utility model discloses an overheated steam in the drying storehouse of superheated steam disk dryer carries out the circulation flow drying of circulation convection heat transfer mass transfer to the material on the drying dish, and the material on the drying dish also obtains the conduction drying of the heat energy conduction heat transfer of drying dish disk body simultaneously, and the material is the dual heat transfer drying of circulation flow drying and conduction drying, has improved heat transfer rate and mass transfer efficiency to the material.

The utility model discloses compare with current disc dryer has following beneficial effect: a disk-type superheated steam drier is composed of drying cabin, motor, steam blower, circulating air guider, steam pipe, heater, drying disk, drive axle, rake rod unit and exhaust unit. The disk surface of the drying disk is not deformed under the heat transfer effect of the superheated steam. The superheated steam flows in the drying bin in a counter-current manner from bottom to top, the superheated steam of the circulating flow passes through the pores between the materials in the annular material pile, the convective heat transfer between the superheated steam and the materials in the annular material pile is enhanced, the superheated steam carries out the circulating convective heat transfer and mass transfer on the materials on the drying tray, the materials on the drying tray also obtain the heat energy conduction and heat transfer of the tray body of the drying tray, and the material drying is the dual heat transfer drying of the circulating flow drying and the conduction drying; the drying bin in the material drying process is filled with superheated steam, circulating flow gas in the drying bin is condensable superheated steam, an air boundary layer is not arranged on the surface of the material, mass transfer resistance can be ignored, drying time is shortened, and the drying speed of the material is accelerated.

Drawings

Fig. 1 is a schematic structural view of the superheated steam tray dryer of the present invention.

In the figure: 1. the device comprises a drying bin, 2, a motor, 3, a circulating fan, 3a, a circulating air inlet, 3b, a circulating air outlet, 4, a heat energy outlet, 5, a steam pipe, 6, a transmission shaft, 7, a rake lever device, 8, a heating device, 9, a steam fan, 10, a small drying disc, 11, a feed inlet, 12, a large drying disc, 13, a discharge outlet, 14, a heat energy inlet, 15, a support, 16, a gas flow direction mark, 18 and an exhaust device.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, wherein the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b):

fig. 1 shows a superheated steam disk dryer, which comprises a drying bin 1, a motor 2, a circulating flow air guide device, a drying disk, a steam pipe 5, a transmission shaft 6, a harrow bar device 7, a heating device 8, a steam fan 9, a support 15 and an exhaust device 18.

The drying bin 1 is provided with a feeding hole 11, a discharging hole 13, an exhaust port, a heat energy inlet 14 and a heat energy outlet 4.

The drying chamber 1 is fixed on the ground through a bracket 15.

The feeding and discharging devices arranged on the feeding port 11 and the discharging port 13 of the drying bin 1 are high-air-tightness feeding and discharging devices.

The transmission shaft 6 penetrates through a bearing device arranged on the drying bin body 1 and enters the drying bin body 1, and the joint of the transmission shaft 6 and the drying bin body 1 is fixedly sealed by a sealing device outside the bin.

The harrow bar device 7 comprises a fixed frame, a harrow bar, harrow blades and a guide plate. A plurality of groups of harrow bar devices 7 are fixedly arranged on a transmission shaft 6 in the drying bin 1.

The motor 2 is arranged at the upper end of the drying bin 1, and the motor 2 is fixed on the bin body of the drying bin 1 through a support. The motor 2 is connected with the transmission shaft 6, the motor 2 drives the transmission shaft 6 to do rotary motion, the rake lever device 7 and the transmission shaft 6 do rotary motion together, the rake blades are driven by the rake lever to rotate along the disc surface of the drying disc, and under the guiding and guiding effects of the rake blades, materials on the drying disc are gathered into an asymmetrical annular material pile along the side edges of the rake blades.

The drying tray comprises a metal plate and a bracket; the bracket supports and fixes the metal plate. The thickness of the metal plate is 5 mm. The tray body of the drying tray is air-impermeable. The drying trays comprise a large drying tray 12 and a small drying tray 10; the large drying tray 12 and the small drying tray 10 are fixed on the bin body in the drying bin 1 by a supporting frame in sequence.

The exhaust means 18 is a vacuum pump. When the exhaust device 18 on the exhaust port of the drying chamber 1 exhausts the moisture generated when the materials in the drying chamber 1 are dried, the moisture carries the air leaked into the drying chamber 1 when the materials are fed and discharged and is exhausted out of the drying chamber 1.

The steam fan 9 is installed on the heat energy outlet 4 of the drying bin 1, moisture and superheated steam in the drying bin 1 are discharged from the heat energy outlet 4 of the drying bin 1 under the pumping and discharging action of the steam fan 9 and enter the heating device 8 through the steam pipe 5 to conduct heat transfer and heating, the heated superheated steam enters the drying bin 1 through the heat energy inlet 14 of the drying bin 1, and the superheated steam conducts closed-loop convection heat transfer and mass transfer on materials in the drying bin 1. The tray body of the drying tray obtains the heat transfer of the superheated steam, and the heat energy on the tray body of the drying tray transfers the heat to the materials on the drying tray.

The heating device 8 is an electric heating wire, and the heating device 8 is arranged in the steam pipe 5.

The circulating flow air guide device comprises a circulating fan 3 and an air guide pipe. The circulating flow air guide device is arranged on the body of the drying bin (1); the circulation fan 3 is a pipe fan or a centrifugal fan. The circulating fan 3 is arranged in the air duct or between the two air ducts. According to the temperature in the drying bin 1, the circulating fan 3 is arranged in the drying bin 1, and the circulating air outlet 3b and the circulating air inlet 3a of the air guide pipe are arranged in the drying bin 1. The circulation air inlet 3a of the air duct is arranged above the circulation air outlet 3b, superheated steam above the drying bin 1 is pumped and discharged by the circulation fan 3 and guided to the lower part of the drying bin 1, the superheated steam circulates and convects in the drying bin 1, and heat energy carried by the superheated steam conducts heat conduction on a drying disc and materials in the drying bin 1.

The material superheated steam drying process of the superheated steam disc type dryer is as follows:

step one, starting the heating device 8 to preheat the drying bin 1. The superheated steam heated by the heating device enters the drying bin through a heat energy inlet 14 of the drying bin. Superheated steam is filled in the drying bin 1, the superheated steam flows in the drying bin 1 in a counter-flow manner from bottom to top, and the disc surfaces of the large drying disc 12 and the small drying disc 10 cannot deform under the heat transfer effect of the superheated steam; the superheated steam carries out closed-loop circulating flow in the drying bin 1 to carry out heat transfer and mass transfer on the materials.

And step two, the relative pressure in the drying bin 1 is controlled by the exhaust device 18, and the temperature of the materials in the drying bin 1 is controlled by the relative pressure in the bin and the temperature of the superheated steam.

According to the requirements of heat sensitivity, quality, nutritional parameters and the like of the materials, the relative pressure in the drying bin 1 is-0.070 Mpa, superheated steam at 90 ℃ is used as a drying medium, and low-pressure superheated steam drying is carried out on the materials. The gas exceeding the set relative pressure of-0.070 Mpa in the drying bin 1 is exhausted through the exhaust device 18 of the exhaust port of the drying bin 1, and the heat energy in the gas exhausted through the exhaust device 18 in the drying bin 1 is used for preheating the material through the heat exchanger.

And step three, conveying the materials to be dried on a first layer of large drying disc 12 at the upper part in the drying bin 1 by a feeding and discharging device on a feeding hole 11 of the drying bin 1, driving a transmission shaft 6 to rotate by a motor 2, driving a rake rod device 7 to rotate by the transmission shaft 6, and carrying out forward flow displacement from top to bottom on the large drying disc 12 and the small drying disc 10 which are alternately arranged up and down in the drying bin 1 to be turned up and down under the action of rake blades of the rake rod device 7. The material flows through the disc surface of the large drying disc 12 along the exponential spiral line under the pushing action of the harrow blades, and the material moves inwards on the large drying disc 12 in a rotating way and falls onto the next layer of small drying disc 10 from a middle hole in the middle; the materials on the small drying disk 10 are conveyed to the outer edge of the small drying disk 10 by the outward-turning stirring guide flow and fall to the outer edge of the large drying disk 12 below the outer edge of the small drying disk 10; the large drying trays 12 and the small drying trays 10 are alternately arranged up and down, and the materials continuously flow through the whole drying bin 1 in an inward rotating or outward rotating mode.

And step four, discharging moisture and superheated steam generated during drying of the materials in the drying bin 1 as shown by a gas flow direction mark 16 from a heat energy outlet 4 of the drying bin 1 under the pumping and discharging action of a steam fan 9, enabling the moisture and the superheated steam to enter a heating device 8 through a steam pipe 5 for heat transfer and heating, enabling the heated superheated steam to enter the drying bin 1 through a heat energy inlet 14 of the drying bin 1, and enabling the superheated steam to perform closed-loop convection heat transfer and mass transfer on the materials in the drying bin 1. The moisture and the superheated steam in the drying chamber 1 are exhausted from the heat energy outlet 4 of the drying chamber 1 under the pumping action of the steam fan 9.

Step five, under the action of the circulating fan 3, the superheated steam in the drying bin 1 is indicated by a gas flow direction mark 16: the air duct enters from a circulating air inlet 3a of the air duct and is discharged in the drying bin 1 through a circulating air outlet 3b of the air duct, and the circulating convection velocity in the drying bin 1 is increased by superheated steam under the pumping and discharging action of a circulating fan 3.

The drying bin 1 is filled with superheated steam in the material drying process, circulating flow gas in the bin of the drying bin 1 is condensable superheated steam, the superheated steam carries out closed-loop circulating flow in the drying bin 1 to carry out heat and mass transfer on the material, the superheated steam of the circulating flow penetrates through pores between the material and the material in the annular material pile, the superheated steam enhances the convection heat and mass transfer with the material in the annular material pile, the material on the drying tray is also subjected to heat energy conduction and heat transfer of the tray body of the drying tray, the material drying is dual heat and mass transfer drying of circulating flow drying and conduction drying, the heat transfer rate and the mass transfer efficiency of the material are improved, and therefore the material in the drying tray is dried.

And step six, discharging the dried materials in the drying bin 1 out of the drying bin 1 through a feeding and discharging device on a discharging hole 13 of the drying bin 1.

The above embodiments are only used to help understand the manufacturing method and the core idea of the present invention, and the specific implementation is not limited to the above specific implementation, and those skilled in the art can start from the above conception, and the changes made without creative labor all fall within the protection scope of the present invention.

Claims (4)

1. A superheated steam disc type dryer comprises a drying bin (1), a motor (2), a circulating flow air guide device, a drying disc, a steam pipe (5), a transmission shaft (6), a rake rod device (7), a heating device (8), a steam fan (9), a support (15) and an exhaust device (18); the method is characterized in that: the drying tray comprises a metal plate and a bracket; the bracket supports and fixes the metal plate;

the circulating flow air guide device comprises a circulating fan (3) and an air guide pipe; the circulating flow gas guide device is arranged on the drying bin body (1), and a circulating air inlet (3 a) of the gas guide tube is arranged above a circulating air outlet (3 b); the superheated steam under the pumping action of the circulating fan (3) increases the circulating convection velocity in the drying bin (1);

the relative pressure in the drying chamber (1) is controlled by an exhaust device (18);

the steam fan (9) is arranged on the heat energy outlet (4) of the drying bin (1); moisture and superheated steam in the drying bin (1) are discharged from a heat energy outlet (4) of the drying bin (1) under the pumping and discharging action of a steam fan (9), enter a heating device (8) through a steam pipe (5) to carry out heat transfer and heating, the heated superheated steam enters the drying bin (1) through a heat energy inlet (14) of the drying bin (1), and the superheated steam carries out closed-loop convection heat transfer and mass transfer on materials in the drying bin (1).

2. A superheated steam tray dryer as claimed in claim 1, wherein: the feeding and discharging device is a high-airtight feeding and discharging device, or an air seal machine, or a screw feeder, or a vacuum discharging device.

3. A superheated steam tray dryer as claimed in claim 1, wherein: the exhaust device (18) is a vacuum unit, or a vacuum pump, or a Roots blower, or a blower, or an air release valve.

4. A superheated steam tray dryer as claimed in claim 1, wherein: the relative pressure in the drying bin (1) is-0.095 MPa-0.3 MPa.

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