CN112082367A

CN112082367A - Continuous superheated steam drying equipment and method

Info

Publication number: CN112082367A
Application number: CN202011093064.2A
Authority: CN
Inventors: 程长青
Original assignee: Mengzhou Yuanhong Drying Equipment Research and Development Co Ltd
Current assignee: Mengzhou Yuanhong Drying Equipment Research and Development Co Ltd
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2020-12-15

Abstract

The continuous superheated steam drying equipment comprises a drying bin, a heating bin, a feeding device, a discharging device, a roller path, an air guide pipe, an exhaust device, a driving device, a riding wheel, a gear ring, a heating device and a heat-conducting working medium. The drying bin has multiple functions of steam generation, steam heating and material drying, heat energy carried by the heat conducting working medium conducts heat conduction and heat transfer on the steam and the materials in the drying bin, moisture generated during material drying conducts heat and is heated through the roller bin body and the heating pipe to become superheated steam, and the materials are conducted with heat conduction and drying simultaneously through the roller bin body, the heating pipe and the superheated steam. The material is subjected to corresponding high-pressure superheated steam drying, near-atmospheric superheated steam drying and low-pressure superheated steam drying. The materials continuously enter and exit the drying bin through the feeding device and the discharging device, so that continuous superheated steam drying is realized; the material is stirred and raised by the rotating helical blade and the heating pipe, and the material is dried uniformly.

Description

Continuous superheated steam drying equipment and method

Technical Field

The invention relates to superheated steam drying equipment and a method, in particular to continuous superheated steam drying equipment and a method.

Background

The superheated steam drying equipment on the market at present mainly adopts an external steam generator and a heater to manufacture superheated steam, and the matched equipment needs to be provided with the steam generator, the steam heater, dust removing equipment and a steam circulating fan, so that the manufacturing cost of the matched equipment is high. The material of discharge gate direction in the dry storehouse is the low moisture material after the drying, receives the parcel area of convection current steam easily and flies upward, and the impurity in the moisture of conventional emission needs dust collector such as whirlwind formula dust remover or dust sedimentation room to remove dust, just can reach environmental protection requirement and discharge.

Much water is needed to make steam. When the material is dried by the superheated steam, the superheated steam is produced by water through the external steam generator and the heater, the temperature of the superheated steam is decreased along with the decreasing of the temperature of the distance entering the drying bin, the superheated steam cannot be supplemented by heat energy in the drying bin and is cooled into low-temperature steam, the low-temperature steam needs to be discharged from the drying bin or conveyed to a heating device for secondary heating through a steam circulating fan on a pipeline, and the temperature can be increased to the superheated steam again after the superheated steam is heated. Because the material in the drying bin can only be transferred heat and dried by superheated steam, the heat energy carried by the cooled low-temperature steam is limited, enough heat energy cannot be provided for the material to dry, the drying rate of the material is much slower, the phenomenon of condensed water is easy to appear after the low-temperature steam is contacted with the low-temperature material or the roller bin body, a plurality of superheated steam drying devices cannot realize continuous superheated steam drying, and the drying moisture of the material is uneven.

Some superheated steam drying equipment on the market now also carries out secondary heating with tail gas steam through steam heater and carries out the inner loop and use, but exhaust tail gas steam contains a lot of impurity, and impurity in the tail gas steam can the adhesion on steam heater, causes steam heater's heat transfer rate to descend by a wide margin so that damage can not use.

At present, a steam generator, a steam heater, a dust removal device and a steam circulating fan are required to be installed in sludge superheated steam drying equipment on the market, and the manufacturing cost of matched equipment is high. When the existing sludge is dried by superheated steam, the sludge enters the drying bin through the conveying of the sludge pump, and the conveying quantity of the sludge is not easy to control. The water is used for producing superheated steam through an external steam generator and an external heater, and the temperature of the superheated steam is reduced along with the temperature decrease of the distance of the superheated steam entering the drying bin. Because the sludge in the drying bin can only be dried by the heat transfer of the superheated steam, the heat energy carried by the cooled low-temperature steam in the drying bin is limited, the heat energy carried by the cooled low-temperature steam cannot provide enough heat energy for drying the sludge in the drying bin, the drying rate of the superheated steam of the sludge is much slower, and the moisture of the dried sludge is uneven.

The pasture drying equipment and method in the market at present are key equipment and treatment process for deep processing of pasture and increasing the added value of pasture products. At present, drum-type pasture drying equipment adopted at home and abroad comprises supporting equipment such as a hot blast stove, a preheating drying drum, a three-pass drying drum, a dust removal device and the like, and the manufacturing cost of the supporting equipment is high. When the pasture is dried, a high-temperature air convection drying method is adopted to dry the pasture, and the problems of uneven drying moisture, poor color and luster, easy pasture combustion caused by high-temperature air and the like exist. Superheated steam drying has not been applied in the forage field.

The superheated steam drying equipment for the fruit slices on the market at present needs to be provided with a steam generator, a steam heater and a steam circulating fan, and the manufacturing cost of matched equipment is high. When the fruit slices are dried by superheated steam, the superheated steam is produced by water through an external steam generator and a heater, and the temperature of the superheated steam is reduced along with the temperature decrease of the distance between the superheated steam and the drying bin. Because the fruit pieces in the drying bin can only be dried by transferring heat through superheated steam, the cooled low-temperature steam cannot provide enough heat energy for the fruit pieces in the drying bin to dry, and the low-temperature steam is easy to condense after contacting with a low-temperature material or a roller bin body. The fruit pieces cannot be dried by continuous superheated steam, and the water content of the statically dried fruit pieces is not uniform.

Superheated steam drying is a well-established technology and can be classified into low-pressure superheated steam drying, high-pressure superheated steam drying and near-atmospheric superheated steam drying according to the operating pressure of the superheated steam dryer. Under the prerequisite condition of guaranteeing dry quality of material, need carry out optimal design to superheated steam drying equipment, reduce supporting equipment such as installation steam generator, steam heater and steam circulating fan, heating device has replaced steam generator, reduces the cost of manufacture of equipment. The dynamic sealing performance of the drying bin is improved, the recycling of heat energy is improved, multi-combination drying is implemented, continuous superheated steam drying is achieved, and the drying cost is reduced.

Disclosure of Invention

The invention aims to solve the problems of the prior art and provides continuous superheated steam drying equipment, which is simple in matched equipment and low in manufacturing cost of the whole set of equipment and can be used for continuous superheated steam drying.

In order to achieve the purpose, the invention is realized by the following technical scheme: the continuous superheated steam drying equipment comprises a drying bin, a heating bin, a feeding device, a discharging device, a roller path, a support, an air guide pipe, an exhaust device, a driving device, a riding wheel, a gear ring, a heating device and a heat conducting working medium.

The drying bin comprises a roller, a helical blade, a heating pipe and a fixing strip. The diameter of the drying bin is 800-2800 mm, and the length is 6800-28800 mm.

The bin body of cylinder be 5 ~ 12 mm's metal sheet. The processing and manufacturing of the roller are mature technologies, and the invention is not introduced.

The helical blade is fixed on the bin body in the roller. The spiral blade is made of a metal plate with the thickness of 1-5 mm, the height of the spiral blade is 180-580 mm, and the length of the spiral blade is set according to needs. In the rotation process of drying storehouse, helical blade is synchronous revolution together along with rotatory cylinder, and the material is stirred by rotatory helical blade and is raised, and the material can not form the caking, and the even quilt of material is dried. Under the rotating propelling action of the helical blades, the materials flow from the feeding hole of the drying bin to the discharging hole of the drying bin and advance.

The drum body is provided with holes, and the inner diameter of each hole is the same as the outer diameter of each heating pipe. The holes on the roller bin body are plain end holes which are machined and manufactured by cutting equipment such as laser and gas cutting, and the holes on the roller bin body are hot-melt hole type holes which are machined and manufactured by a hot-melt drill.

The thickness of the hot melting hole type hole is 3-4 times of the thickness of the bin body, and the hot melting hole type bin has the advantages that: 1. the hot-melt hole type holes and the bin body are integrated, the hot-melt hole type holes improve the fixing surface of the heating pipe, the firmness of the heating pipe and the bin body is enhanced, and the leakage risk is avoided; 2. the thickness of the metal plate of the roller bin body is reduced, the manufacturing cost of the drying bin is reduced, the total weight of the drying bin is reduced, and the electric energy consumption of the driving device is reduced.

The diameter of the heating pipe is 28-48 mm, and the length is 300-2810 mm. Heating pipes with different lengths are installed in one drying bin, and the heating pipes installed in a crossed manner are convenient for increasing the installation number of the heating pipes. The heating pipe is a light pipe or is provided with fins, and the heating pipe also improves the heat transfer area of the heat energy of the drying bin.

The heating pipe is a metal pipe with one open end, and the open end of the heating pipe is fixed in a hole on the drum body; or a metal pipe with openings at two ends, and two ends of the opening of the heating pipe are fixed in corresponding holes on the drum body. Through the electric welding, fix the welding as an organic whole with the junction of the open end of heating pipe and the hole on the cylinder storehouse body, the connection on the open end of heating pipe and the cylinder storehouse body is sealed airtight.

The interval of heating pipe and adjacent heating pipe be 80 ~ 280mm, the heating pipe is supported by fixed strip fixed stay with adjacent heating pipe, the cylinder storehouse body has improved the compression resistance in dry storehouse under the supporting role of heating pipe: 1. the heating pipe ensures that the bin body cannot expand and crack when the pressure in the drying bin is high; 2. the heating pipe ensures that the bin body is not sucked flat under the action of external pressure when the drying bin is internally provided with low pressure. 3. The heating pipe reduces the thickness of the metal plate of the roller bin body, reduces the manufacturing cost of the drying bin, reduces the total weight of the drying bin and reduces the electric energy consumption of the driving device.

The gear ring is arranged on the drying bin or the heating bin. When the drying bin and the heating bin are not integrated, the gear ring and the drying bin are connected and fixed into a whole; when the drying bin and the heating bin are integrated, the gear ring and the heating bin are fixedly connected into a whole.

The roller path is arranged on the drying bin or the heating bin. When the drying bin and the heating bin are not integrated, the roller path and the drying bin are connected and fixed into a whole; when the drying bin and the heating bin are integrated, the roller path and the heating bin are connected and fixed into a whole.

The riding wheel supports the roller path, and is fixed on the bracket or on the ground; the bracket is made by welding metal steel materials such as angle iron and the like.

The driving device is fixed on the bracket or on the ground.

The driving wheel of the driving device is meshed with the wheel teeth of the gear ring, the gear ring drives the drying bin, the drying bin is driven by the driving device through the gear ring, and the drying bin rotates on the riding wheel. The rotating speed of the drying bin is 1-10 circles, the rotating speed is set according to the drying rate of different materials, and the time of the materials in the drying bin is controlled by the rotating speed of the drying bin.

The driving device is an electric motor, a hydraulic motor, a pneumatic motor or a combination of an electric motor and a speed changer.

The heating bin is arranged outside the drying bin, and the size of the heating bin is matched with that of the drying bin.

When the heating bin and the drying bin are separated and not connected, a heat energy inlet and a heat energy outlet are formed in the heating bin; the external shape of the heating chamber is bathtub-shaped; the lower half part of the drying bin is soaked in the heat-conducting working medium in the heating bin; the heating bin and the drying bin are not connected, and the bin body space between the heating bin and the drying bin is 50-100 mm. When the drying bin rotates on the riding wheel, the heating bin is fixed.

The heat energy inlet and the heat energy outlet of the heating bin are connected with an external heating device through a conduit. After the heat-conducting working medium is heated by an external heating device, the heat-conducting working medium carrying heat energy enters the heating bin through a heat energy inlet of the heating bin, and the heat-conducting working medium carrying heat energy in the heating bin conducts heat conduction and heat transfer for the roller bin body and the heating pipe; and after the heat-radiated heat-conducting working medium flows out of the heating bin through the heat energy outlet of the heating bin, the heat-radiated heat-conducting working medium is conveyed into the heating device through the conduit to be heated again. The heat conducting working medium is circularly heated and radiated in the heating bin, the guide pipe and the heating device.

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; different heating devices can be selected according to the requirements of equipment cost, environmental protection and the like.

When the heating bin and the drying bin are fixed as a whole, the heating bin wraps the outside of the drying bin, and a sealed cavity is arranged between the drying bin and the heating bin. The heat conducting working medium is arranged in a sealed cavity between the drying bin and the heating bin; the heating bin and the drying bin are fixedly connected, and the heating bin and the drying bin are supported and fixed by metal strips. The distance between the heating bin and the drying bin is 50-100 mm; the drying bin and the heating bin rotate together on the riding wheel. The heat conducting working medium in the heating bin is directly heated by a built-in or external heating device, the heat conducting working medium in the heating bin enters the heating pipe through the opening of the heating pipe, and heat energy carried by the heat conducting working medium is conducted on the heating pipe. The heat energy carried by the heat conducting working medium conducts heat conduction and transfers heat to the steam and the materials in the drying bin through the roller bin body and the heating pipe.

Drying storehouse is at rotatory in-process, and the heating pipe rotates along with drying storehouse, and the heating pipe plays the effect of stirring the material again when giving material and steam heat transfer heating, and the material can not form the caking, and the material is dry even.

The heat conducting working medium is heat conducting oil, or water, or other media; different heat-conducting working media can be selected according to the requirements of cost, heat-conducting temperature and the like.

The outside of dry storehouse and heated warehouses keep warm by the heat preservation, the interval between heat preservation and the dry storehouse is 10 ~ 80mm, the heat preservation laminating is on the outside of heated warehouses.

The discharging device is arranged on a discharging port of the drying bin, and the feeding device is arranged on a feeding port of the drying bin.

The discharging device comprises a flange joint, a sealing device, an elbow, a material conveying device, a hopper and a supporting frame; one end of the elbow is an inlet, and the other end is an outlet. The elbow is fixedly supported by the support frame; the inlet of the elbow and the flange joint are fixed and dynamically sealed by a sealing device. One end of the material conveying device and the outlet of the elbow are fixed into a whole, and the other end of the material conveying device is provided with a hopper. The flange joint of the discharging device is fixedly connected with the discharging port of the drying bin, when the drying bin rotates, the flange joint of the discharging device rotates along with the drying bin, the elbow is stationary, and the space between the inlet of the elbow and the flange joint is sealed and airtight.

The feeding device comprises a flange joint, a sealing device, a three-way pipe, a material conveying device, a hopper and a supporting frame; the three-way pipe is fixedly supported by the support frame. The three-way pipe is provided with an inlet, an outlet and an exhaust port. The dynamic seal is fixed between the outlet of the three-way pipe and the flange joint by a sealing device. One end of the material conveying device and the inlet of the three-way pipe are fixed into a whole, and the other end of the material conveying device is provided with a hopper. The flange joint of the feeding device is fixedly connected with the feeding hole of the drying bin, the flange joint of the feeding device rotates along with the drying bin, the three-way pipe is static, and the space between the outlet of the three-way pipe and the flange joint is sealed and airtight.

One end of the air duct is fixed on an exhaust port of the three-way pipe, and the other end of the air duct is fixed on the exhaust device or the heat exchanger and the exhaust device in sequence; the outside of the air duct is provided with a heat preservation layer for heat preservation. The heat exchanger or the condenser is arranged on the air guide pipe between the exhaust device and the feeding device. The heat exchanger or the condenser is mature corollary equipment and is not described, and the heat exchanger or the condenser is not shown in the attached drawings of the specification of the invention.

The feeding device and the discharging device convey materials, and when the relative pressure in the drying bin is low, the air inflow of external air into the drying bin is reduced; when the relative pressure in the drying bin is high, the steam in the drying bin is ensured not to leak into the external environment.

The sealing device is a magnetic fluid sealing device, or a dynamic sealing device, or a labyrinth sealing device. The sealing device adopted by the invention is a mature product in the market, and the specific installation method of the sealing device is not introduced.

The hopper plays a role in sorting and collecting bulk materials, the bulk materials can conveniently enter the drying bin continuously through the material conveying device, and the bulk materials discharged from the drying bin are collected and conveyed through the hopper.

The material conveying device continuously and timely inputs and discharges materials in the drying bin, and dynamic sealing is kept in the material conveying process. When the material conveying device conveys materials, the relative pressure low pressure in the drying bin is ensured, and the air inflow of the gas in the hopper into the drying bin is reduced; when the relative pressure in the drying chamber is high, the steam in the drying chamber does not leak to the external environment.

The material conveying device is an air seal machine, or a sludge pump, or a slurry pump, or a screw feeder, or a high-airtight type discharge valve (authorized bulletin number: CN 104743328B), or a vacuum discharge valve. And selecting the corresponding material conveying device according to different use requirements.

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 moisture generated when the materials in the drying bin are dried is discharged through the air outlet arranged on the feeding device, the steam in the drying bin moves in a convection manner towards the feeding port of the drying bin under the action of the air discharging device, and the steam is in a convection flow state in the drying bin. The steam in the drying bin is reversely discharged, the materials in the driving bin of the rotary drying bin fly up and down, the materials flying up and down in the bin increase the contact surface of dust impurities in the steam, the dust impurities in the steam are adhered to the materials, the steam after dust removal is discharged through the exhaust port of the feeding device installed on the feeding port of the drying bin, the heat exchange rate of the heat exchanger cannot be reduced, and the environment-friendly requirement discharge can be achieved.

The heat exchanger exchanges heat of heat energy in steam discharged from the drying bin through the heat exchanger, and the heat energy is used for preheating materials or is used for other purposes, so that the effects of waste heat utilization, energy conservation and emission reduction are achieved.

The pressure in the drying bin is controlled by an exhaust device, and the temperature of the materials in the drying bin is controlled by the relative pressure in the bin and the temperature of the superheated steam. And performing corresponding high-pressure superheated steam drying, approximate atmospheric pressure superheated steam drying and low-pressure superheated steam drying on the materials according to the requirements of the heat sensitivity, the quality, the nutritional parameters and the like of the materials.

The drying bin is a steam generator, a steam heater and material drying equipment. The drying bin has multiple functions of steam generation, steam heating and material drying, and heat energy carried by the heat-conducting working medium conducts heat conduction and heat transfer to the steam and the materials in the drying bin through the drum body and the heating pipes. The heat dissipation area of the roller bin body and the heat dissipation area of the heating pipe are increased by 8-35 times relative to the heat dissipation area of the interlayer bin body of the roller, and the heat transfer speed of heat energy carried by the heat conducting working medium is improved.

The superheated steam, the material and the heat-conducting working medium interact with each other to supplement each other. The water source of the superheated steam is the moisture generated during material drying, the heat energy carried by the heat conducting working medium conducts heat transfer and heats the roller bin body, the heating pipe and the steam, the moisture generated during material drying is conducted on the heat energy on the roller bin body and the heating pipe through the heat conducting working medium to be the superheated steam after being heated, and the material in the drying bin conducts heat transfer and drying on the heat energy on the roller bin body and the heating pipe and the superheated steam simultaneously through the heat conducting working medium.

The roller chamber body and the heating pipe of the drying chamber are provided with high-temperature heat energy conducted by heat conducting working medium, and the condensation and dewing phenomena of moisture generated during material drying can not occur on the roller chamber body and the heating pipe in the drying chamber.

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 an equilibrium process.

The superheated steam and the materials in the drying bin flow dynamically, the superheated steam is in full contact with the materials in the flying, the superheated steam enhances the convection heat transfer with the materials in the flying, the superheated steam transfers the carried heat energy to the wet materials through the convection heat transfer and mass transfer diffusion effects between the superheated steam and the materials, meanwhile, the moisture in the wet materials absorbs heat, is vaporized and diffused, is carried away by the steam, and performs heat transfer, mass transfer and drying on the materials.

The invention aims to solve the problem of overcoming the defects of the existing superheated steam drying method and provides a continuous superheated steam drying method, which comprises the following working procedures:

firstly, heating the heat-conducting working medium in the heating bin by a heating device, wherein the temperature of the heated heat-conducting working medium is 60-480 ℃. The heat energy carried by the heat conducting working medium conducts heat conduction and transfers heat to the steam and the materials in the drying bin through the roller bin body and the heating pipe.

And secondly, the driving device drives the drying bin to rotate on the riding wheel through the gear ring. The driving wheel of the driving device is meshed with the wheel teeth of the gear ring on the drying bin, the gear ring drives the drying bin to rotate, and the drying bin is supported by the riding wheel to rotate.

Thirdly, the continuous superheated steam drying equipment is prepared to start working: 1. 10-50 kg of water can be added into a drying bin, heat energy carried by a heat conducting working medium is used for conducting heat transfer and heating on 10-50 kg of water added into the drying bin through a roller bin body and a heating pipe to form superheated steam, and then the used superheated steam is used as water source of the moisture generated during material drying, so that water resources are saved. 2. The water is not added in the drying bin, the moisture generated by the superheated steam during the drying of the material is directly utilized as a water source, the moisture generated during the drying of the material is heated by the heat energy conducted on the drum bin body and the heating pipe through the heat-conducting working medium to form the superheated steam, and the temperature of the superheated steam is controlled by the heat energy heat transfer compensation of the heat-conducting working medium.

And fourthly, the wet materials enter the drying bin through a feeding device on a feeding hole of the drying bin, and the materials outside the drying bin continuously enter the drying bin through a hopper, a material conveying device and a three-way pipe of the feeding device. Under the action of the rotary propulsion of the helical blades, the materials in the drying bin flow from the feeding port of the drying bin to the discharging port of the drying bin.

Fifthly, according to the requirements of heat sensitivity, quality, nutritional parameters and the like of the materials, the temperature of the heat-conducting working medium is 60-480 ℃, the relative pressure in the drying bin is-0.098-0.3 Mpa, the superheated steam at 50-400 ℃ is used as a drying medium, and the materials are dried by high-pressure superheated steam, or by approximately atmospheric pressure superheated steam, or by low-pressure superheated steam.

And sixthly, under the action of the exhaust device, the superheated steam in the drying bin is in a convection flow state in the drying bin. The exhaust device is started, and air in the steam carrier drying bin is pumped out of the drying bin by the exhaust device. Exhaust apparatus produces when dry the dry storehouse of moisture steam pump drainage according to the pressure that dry storehouse set for, the moisture steam that produces when dry the interior material of dry storehouse passes through the gas vent on the feed arrangement and gets into the air duct, the moisture steam gets into the heat exchanger through the air duct and carries out the heat transfer processing, the comdenstion water is by drain valve discharge heat exchanger, heat energy in the moisture steam passes through the heat exchanger heat transfer back, its heat energy heats for the material or the heat conduction working medium outside the dry storehouse, gas after the condensation is carried by exhaust apparatus pump drainage dry storehouse through the air duct.

Seventhly, the materials are subjected to heat transfer and drying simultaneously through the roller bin body, the heating pipe and the superheated steam. The superheated steam in the drying bin is fully contacted with the materials in the flying, the convective superheated steam enhances the convective heat transfer with the materials in the flying, the heat energy carried by the roller bin body, the heating pipe and the superheated steam is conducted on the materials, the kinetic energy of water molecules on the surface and in the materials is improved, the binding force of the water and the materials is damaged, and the water is gasified into steam to enter the surrounding superheated steam heat-conducting working medium. The exhaust device exhausts moisture steam generated when the materials in the drying bin are dried, so that the materials are dried.

Eighthly, discharging the dried materials out of the bin through a discharging device on a discharging port of the drying bin under the action of rotary propulsion of the helical blades. The materials in the drying bin sequentially pass through the elbow of the discharging device, the material conveying device and the discharging bin of the hopper.

When the continuous superheated steam drying equipment provided by the invention is used for continuously drying the material superheated steam, the material surface has no air boundary layer, so that the mass transfer resistance can be ignored, and the drying time is shortened; the energy-saving effect of the superheated steam drying is remarkable, the latent heat of the steam is fully utilized by recovering the heat energy of the wet steam, and the heat efficiency of the heat energy is high.

A continuous superheated steam drying method for sludge adopts the working flow of the continuous superheated steam drying method for materials. According to the requirements of heat sensitivity, material and the like of the sludge, superheated steam drying with different pressures is carried out. The temperature of the heat conducting working medium is 150-480 ℃, the relative pressure in the drying bin is 0.11-0.3 Mpa, and the heat energy carried by the heat conducting working medium conducts heat conduction and transfer to the steam and the sludge to be dried in the drying bin through the roller bin body and the heating pipe. The sludge in the drying bin is subjected to heat transfer and drying by the roller bin body, the heating pipe and the superheated steam at the same time, so that the drying speed of the superheated steam drying of the sludge is improved, and the dried sludge has uniform moisture. Continuous superheated steam drying is realized, and high-pressure superheated steam drying is carried out on the sludge. The exhaust device is a fan or an air escape valve.

A continuous superheated steam drying method for pasture adopts the working flow of the continuous superheated steam drying method for the material; according to the requirements of heat sensitivity, quality, nutritional parameters and the like of the pasture, superheated steam drying with different pressures is implemented. The temperature of the heat conducting working medium is 90-180 ℃, the relative pressure in the drying cabin is-0.02-0.12 Mpa, and the heat energy carried by the heat conducting working medium conducts heat conduction and transfer to the steam in the drying cabin and the forage grass to be dried through the roller cabin body and the heating pipe. The grass in the drying cabin is subjected to heat transfer and drying simultaneously by the roller cabin body, the heating pipe and the superheated steam, and the superheated steam which is approximately at atmospheric pressure is used for drying the grass.

The continuous superheated steam drying method of the pasture enables the pasture to be dried in the drying bin in an anaerobic state, and can effectively retain the nutritional ingredients and the color of the materials; the continuous superheated steam drying speed of the pasture is improved, the drying moisture is uniform, and the pasture achieves the purposes of quality improvement and efficiency improvement. The high-temperature superheated steam drying can not cause pasture grass combustion.

A continuous superheated steam drying method of fruit chips adopts the working flow of the continuous superheated steam drying method of a material; according to the requirements of heat sensitivity, quality, nutritional parameters and the like of the fruit slices, superheated steam drying with different pressures is carried out. The temperature of the heat conducting working medium is 60-100 ℃, the relative pressure in the drying bin is-0.098-0.020 MPa, and the fruit pieces are dried by low-pressure superheated steam. When the fruit pieces are dried by superheated steam, heat energy carried by the heat-conducting working medium conducts heat conduction on the steam and the fruit pieces in the drying bin through the drum body and the heating pipe. The fruit pieces in the drying bin are subjected to heat transfer and drying by the roller bin body, the heating pipe and the superheated steam at the same time, so that continuous superheated steam drying is realized. The fruit pieces are subjected to low pressure superheated steam drying. The exhaust device is a vacuum unit or a Roots blower; and selecting the corresponding exhaust device according to different use requirements.

The continuous superheated steam drying method of the fruit slices enables fruit and vegetable materials such as the fruit slices to be dried at low temperature, and when superheated steam is used as a drying medium, the drying defects such as cracking, deformation and the like are not easy to generate due to the fact that the surfaces of the fruit slices are wet and the drying stress is small; meanwhile, as the superheated steam drying has no oxidation reaction, the color of the fruit slices does not fade, and the nutritional ingredients, the fragrance and the color in the materials can be effectively reserved; the continuous superheated steam drying rate of the fruit chips is improved, the dried water is uniform, and the fruit chips achieve the purposes of quality improvement and efficiency improvement.

The heat pump of the heating device of the invention is a heater and also a heat exchanger. The hot and humid steam in the discharge of the drying compartment contains almost all the energy needed to heat the steam and evaporate the moisture in the material, and the heat pump starts to recover heat energy by condensing the steam discharged from the drying compartment. The heat pump condenses the moisture in the hot and humid air, thereby recovering most of the latent heat; the same heat pump raises the temperature of the warm return water, which is then used to heat the heat conducting working medium. The heat exchange and recovery of the moisture and the steam can fully utilize the latent heat of the steam, and the heat efficiency of the heat energy is high.

The continuous superheated steam drying equipment and the continuous superheated steam drying method are applied to processing and drying in the fields of coal mines, papermaking, sludge, vegetables, marine products, excrement, traditional Chinese medicinal materials, feed and the like. When materials such as coal mines, paper making, sludge, vegetables, marine products, excrement, traditional Chinese medicinal materials, feed and the like are processed and dried, the temperature of the heat-conducting working medium can be adjusted as required so as to dry the pressure in the bin, and the materials are subjected to corresponding high-pressure superheated steam drying, superheated steam drying approximate to atmospheric pressure and low-pressure superheated steam drying.

The continuous superheated steam drying plant according to the invention can be combined with other heat-using plants for carrying out combined processing and drying: 1. the continuous superheated steam drying equipment is combined with a hot air dryer; 2. the continuous superheated steam drying equipment is combined with a vacuum dryer; 3. the continuous superheated steam drying equipment is combined with a heat pump dryer; 4. the continuous superheated steam drying equipment is combined with a vacuum cooler; 5. continuous superheated steam drying equipment and pellet granulators, and the like. For example: and (3) utilizing the waste heat of the heat energy in the moisture steam discharged from the drying bin: the continuous superheated steam drying equipment and the hot air dryer are combined to be dried: the heat recovery of moisture steam makes the latent heat of steam pass through the heat exchanger preparation for hot-blast, and hot-blast direct hot-blast hot-air supply drying-machine preheats, the primary drying for the material of treating the drying, and hot-blast convection drying is very good to the free water stoving effect of material, consequently, the comprehensive thermal efficiency of the waste heat utilization of heat energy in the moisture steam is high.

The invention has the beneficial effects that: the drying chamber of the continuous superheated steam drying device has multiple functions of steam generation, steam heating and material drying. The heat radiating area of the roller bin body and the heat radiating area of the heating pipe of the drying bin are increased by 8-35 times, and heat energy carried by the heat conducting working medium conducts heat conduction and heat transfer on steam and materials in the drying bin. Superheated steam and materials in the drying bin are in dynamic flow, and the superheated steam enhances the convection heat transfer with the materials in the flying. The moisture that produces when the material is dry becomes superheated steam after carrying out heat transfer heating through the cylinder storehouse body and heating pipe, has practiced thrift the water resource. The steam can not be condensed and dewed in the drying bin. The heat exchange and recovery of the moisture and the steam can fully utilize the latent heat of the steam, and the heat efficiency of the heat energy is high. The materials can continuously enter and exit the drying bin through the feeding device and the discharging device, so that continuous superheated steam drying is realized; the material is stirred by the rotating helical blade and the heating pipe and is lifted, the material can not form caking, and the material is dried uniformly.

Description of the drawings:

FIG. 1 is a schematic view showing the construction of a continuous superheated steam drying apparatus according to the present invention;

FIG. 2 is a schematic structural view of a cross section of the continuous superheated steam drying apparatus of the present invention;

FIG. 3 is a schematic structural view of a drying chamber of the continuous superheated steam drying device of the present invention;

FIG. 4 is a schematic view showing the structure of a feeding device of the continuous superheated steam drying equipment according to the present invention;

FIG. 5 is a schematic view showing the structure of a discharging device of the continuous superheated steam drying equipment according to the present invention;

FIG. 6 is a schematic view of a continuous superheated steam drying apparatus according to the present invention, in which a drying chamber and a heating chamber are integrally fixed;

FIG. 7 is a schematic view of the operation of the continuous superheated steam drying method of the present invention.

In the drawings: 1. the device comprises a drying bin, 2, a heating bin, 3, a feeding device, 4, a discharging device, 5, a roller path, 6, a support, 7, an exhaust device, 8, a driving device, 9, a riding wheel, 10, a gear ring, 11, a support frame, 12, an air duct, 13, a discharge port, 14, a heat energy outlet, 15, a heat energy inlet, 16, a fixing strip, 17, a heat insulation layer, 18, a heat conduction working medium, 19, a heating pipe, 20, a sealing device, 21, a flange joint, 22, a hopper, 23, a helical blade, 24, a feed port, 25, a heating device, 26, a three-way pipe, 27, an elbow, 28, a material conveying device, 29 and an exhaust port.

The invention is further described below with reference to the accompanying drawings and examples.

Example 1:

the continuous superheated steam drying equipment shown in figures 1, 2 and 3 comprises a drying bin 1, a heating bin 2, a feeding device 3, a discharging device 4, a roller path 5, a support 6, an exhaust device 7, a driving device 8, a riding wheel 9, a gear ring 10, an air guide pipe 12, a heat conducting working medium 18 and a heating device 25.

The drying bin 1 comprises a roller, a helical blade 23, a heating pipe 19 and a fixing strip 16. The diameter of the drying chamber 1 is 1200mm and the length is 8800 mm.

The helical blade 23 is fixed on the bin body in the roller, and the material flows from the feed inlet 24 of the drying bin 1 to the discharge outlet 13 of the drying bin 1 to advance under the rotating propelling action of the helical blade 23.

The drum body is provided with a hole, and the diameter of the hole is the same as the outer diameter of the heating pipe 19.

The holes on the roller bin body are hot-melt hole type holes.

The diameter of the heating pipe 19 is 28-48 mm, and the length is 300-2810 mm; the heating tube 19 is provided with fins.

The opening end of the heating pipe 19 is fixed in a hole on the drum body. Through the electric welding, fix the welding as an organic whole with the open end of heating pipe 19 and the junction of the hole on the cylinder storehouse body, the connection on the open end of heating pipe 19 and the cylinder storehouse body is sealed airtight.

The distance between the heating pipe 19 and the adjacent heating pipe 19 is 180mm, and the heating pipe 19 and the adjacent heating pipe 19 are fixedly supported by the fixing strip 16.

The gear ring 10 and the roller path 5 are arranged in the drying bin 1; the roller 9 supports the roller path 5, and the roller 9 is fixed on the bracket 6.

The driving device 8 is fixed on the bracket 6. The driving device 8 drives the drying chamber 1 to rotate on the riding wheel 9 through the gear ring 10. The rotation speed of the drying chamber 1 is 2 revolutions. The drive means 8 is a hydraulic motor.

The heating bin 2 is arranged outside the drying bin 1, and the bin body space between the heating bin 2 and the drying bin 1 is 50-100 mm. The heating chamber 2 is stationary while the drying chamber 1 is in rotational motion on the riding wheels 9.

The heat energy inlet 15 of the heating bin 2 is connected to the external heating device 25 through a conduit, the heat energy outlet 14 of the heating bin 2 is connected to the heating device 25 through a conduit, and the heat conducting working medium 18 circularly heats and dissipates heat inside the heating bin 2, the conduit and the heating device 25.

The heating device 25 is a boiler; the heat conducting working substance 18 is a heat conducting oil. The heat energy carried by the heated heat-conducting working medium 18 conducts heat conduction and transfers heat to the steam and the materials in the drying bin 1 through the drum bin body and the heating pipe 19.

And heat insulation layers 17 are arranged outside the drying bin 1 and the heating bin 2 for heat insulation. The insulation 17 is stationary. The interval between heat preservation 17 and drying storehouse 1 is 10 ~ 80mm, and heat preservation 17 laminating is on heating storehouse 2's outside.

As shown in fig. 1, 4 and 5, the discharging device 4 is installed on the discharging port 13 of the drying bin 1, and the feeding device 3 is installed on the feeding port 24 of the drying bin 1.

The discharging device 4 comprises a flange joint 21, a sealing device 20, an elbow 27, a material conveying device 28, a hopper 22 and a supporting frame 11; the elbow 27 is fixedly supported by the support frame 11; one end of the elbow 27 is the inlet and the other end is the outlet. The inlet of the elbow 27 and the flange joint 21 are fixed and dynamically sealed by a sealing device 20, and the connection between the inlet of the elbow 27 and the flange joint 21 is airtight. One end of the material conveying device 28 is fixed with the outlet of the elbow 27 into a whole, and the other end is provided with the hopper 22. The flange joint 21 of the discharging device 4 is fixedly connected with the discharging port 13 of the drying bin 1, when the drying bin 1 rotates, the flange joint 21 of the discharging device 4 rotates along with the drying bin 1, the elbow 27 is stationary, and the space between the inlet of the elbow 27 and the flange joint 21 is sealed and airtight.

The feeding device 3 shown in fig. 1 and 4 comprises a flange joint 21, a sealing device 20, a tee pipe 26, a material conveying device 28, a hopper 22 and a supporting frame 11; the tee 26 is fixedly supported by the support bracket 11. Tee 26 has an inlet, an outlet, and a vent 29. The dynamic seal is fixed between the outlet of the tee 26 and the flange joint 21 by the sealing device 20, and the connection between the outlet of the tee 26 and the flange joint 21 is airtight. One end of the material conveying device 28 is fixed with the inlet of the three-way pipe 26 into a whole, and the other end is provided with the hopper 22. The flange joint 21 of the feeding device 3 is fixedly connected with the feeding hole 24 of the drying bin 1, when the drying bin 1 rotates, the flange joint 21 of the feeding device 3 rotates along with the drying bin 1, the three-way pipe 26 is stationary, and the space between the outlet of the three-way pipe 26 and the flange joint 21 is sealed and airtight.

One end of the air duct 12 is fixed on an exhaust port 29 of the three-way pipe 26, and the other end is sequentially fixed on the heat exchanger and the exhaust device 7.

The seal 20 is a labyrinth seal.

The material conveying device 28 is an air seal machine, and the exhaust device 7 is a Roots blower.

The drying bin 1 has multiple functions of steam generation, steam heating and material drying. The water source of the steam in the drying bin 1 is the moisture generated when the material is dried. The heat energy carried by the heat conducting working medium 18 conducts heat transfer and heats the roller bin body, the heating pipe 19 and the steam, the moisture generated during material drying is conducted on the heat energy on the roller bin body and the heating pipe 19 through the heat conducting working medium 18 to be heated into superheated steam, and the materials are conducted with heat transfer and drying simultaneously by the roller bin body, the heating pipe 19 and the superheated steam.

The high temperature conducted by the heat conducting working medium 18 is arranged on the drum body and the heating pipe 19, and the condensation and dew condensation phenomenon of moisture generated in the drying bin 1 can not occur when the materials are dried.

Referring to fig. 1, 4, 5, and 7, a continuous superheated steam drying method is provided, which comprises the following steps:

firstly, the heat-conducting working medium 18 in the heating bin 2 is heated by a heating device 25, and the temperature of the heated heat-conducting working medium 18 is 60-480 ℃. The heat energy carried by the heat conducting working medium 18 conducts heat conduction and transfers heat to the steam and the materials in the drying bin 1 through the drum body and the heating pipe 19.

Secondly, the driving device 8 drives the drying bin 1 to rotate on the riding wheel 9 through the gear ring 10. The driving wheel of the driving device 8 is engaged with the wheel teeth of the gear ring 10 on the drying bin 1, the gear ring 10 drives the drying bin 1 to rotate, and the drying bin 1 is supported by the riding wheel 9 to rotate.

And thirdly, the wet materials enter the drying bin 1 through the feeding device 3 on the feeding hole 24 of the drying bin 1, and the materials flow from the feeding hole 24 of the drying bin 1 to the discharging hole 13 of the drying bin 1 under the action of the rotary propulsion of the helical blades 23.

Fourthly, the relative pressure in the drying bin 1 is-0.098 Mpa-0.25 Mpa, 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.

Fifthly, the materials in the drying bin 1 are subjected to heat transfer and drying simultaneously through the roller bin body, the heating pipe 19 and the superheated steam, and the exhaust device 7 exhausts moisture steam generated when the materials in the drying bin 1 are dried; the material was dry.

Sixthly, discharging the dried materials out of the bin through a discharging device 4 on a discharging hole 13 of the drying bin 1. The materials in the drying bin 1 sequentially pass through the elbow 27 of the discharging device 4, the material conveying device 28 and the hopper 22 to be discharged out of the bin continuously.

Latent heat of moisture steam discharged from the drying bin 1 is made into hot air through a heat exchanger, and the hot air supplies hot air to the dryer to preheat and primarily dry materials to be dried.

Example 2:

a continuous superheated steam drying facility of the present example 2 is the same as the continuous superheated steam drying facility described in the example 1, and a description thereof will not be repeated.

The gear ring 10 and raceway 5 as shown in figure 6 are mounted on the heating chamber 2. When the heating bin 2 and the drying bin 1 are fixed into a whole, the heating bin 2 wraps the outside of the drying bin 1, and the heat conducting working medium 18 is arranged in a cavity between the drying bin 1 and the heating bin 2.

The heat conducting working medium 18 between the drying bin 1 and the heating bin 2 is directly heated by the built-in heating device 25, and the heat conducting working medium 18 carrying heat energy conducts heat for the roller bin body and the heating pipe 19. The heating means 25 is a ceramic heating plate.

The continuous superheated steam drying method of sludge according to example 2 is the same as the continuous superheated steam drying method described in example 1, and thus, a description thereof will not be repeated.

Referring to fig. 1, 4, 5 and 7, a continuous superheated steam drying method for sludge is disclosed, which adopts the working flow of the continuous superheated steam drying method for materials in the previous embodiment 1. According to the requirements of heat sensitivity, material and the like of the sludge, superheated steam drying with different pressures is carried out.

The temperature of the heat conducting working medium 18 is 250 ℃, the relative pressure in the drying bin 1 is 0.2Mpa, heat energy carried by the heat conducting working medium 18 conducts heat conduction to steam and sludge in the drying bin 1 through the roller bin body and the heating pipe 19, moisture generated during sludge drying conducts heat energy on the roller bin body and the heating pipe 19 through the heat conducting working medium 18 to be heated to be superheated steam, the sludge in the drying bin 1 is subjected to heat conduction drying simultaneously through the roller bin body, the heating pipe 19 and the superheated steam, and continuous superheated steam drying is realized on the sludge.

The exhaust means 7 is a bleed valve. A certain pressure parameter is set for the air escape valve, the pressure in the drying bin 1 exceeds the set parameter, and the high-pressure steam in the drying bin 1 leaks and is discharged.

The material conveying device 28 of the discharging device 4 is an air seal machine, and the material conveying device 28 of the feeding device 3 is a sludge pump.

Example 3:

the continuous superheated steam drying method of pasture as per example 3 is the same as the continuous superheated steam drying method as per example 1 and will not be described again.

A continuous superheated steam drying method for pasture as shown in fig. 1, fig. 4, fig. 5 and fig. 7, which adopts the working flow of the continuous superheated steam drying method for material as described above; according to the requirements of heat sensitivity, quality, nutritional parameters and the like of the pasture, superheated steam drying with different pressures is implemented.

The temperature of the heat conducting working medium 18 is 150 ℃, the relative pressure in the drying bin 1 is 0.1 Mpa, heat energy carried by the heat conducting working medium 18 conducts heat conduction and heat transfer to steam and forage grass in the drying bin 1 through the roller bin body and the heating pipe 19, moisture generated during the drying of the forage grass is heated into superheated steam through the heat energy conducted by the heat conducting working medium 18 on the roller bin body and the heating pipe 19, the forage grass in the drying bin 1 is subjected to heat conduction and drying simultaneously through the roller bin body, the heating pipe 19 and the superheated steam, and the continuous superheated steam drying of the forage grass is realized.

The exhaust device 7 is a fan, and the feeding device 28 is a screw feeder.

Example 4:

the continuous superheated steam drying method of the fruit chips of the embodiment 4 is the same as the continuous superheated steam drying method of the embodiment 1, and the description thereof is not repeated.

A continuous superheated steam drying method for fruit slices as shown in fig. 1, 4, 5 and 7, which adopts the working flow of the continuous superheated steam drying method for materials as described above; according to the requirements of heat sensitivity, quality, nutritional parameters and the like of the fruit slices, superheated steam drying with different pressures is carried out.

The temperature of the heat conducting working medium 18 is 90 ℃, the relative pressure in the drying bin 1 is-0.075 Mpa, heat energy carried by the heat conducting working medium 18 conducts heat conduction and heat transfer to steam and fruit pieces in the drying bin 1 through the roller bin body and the heating pipe 19, moisture generated during drying of the fruit pieces is heated through the heat energy conducted by the heat conducting working medium 18 on the roller bin body and the heating pipe 19 to form superheated steam, the fruit pieces in the drying bin 1 are subjected to heat conduction and drying simultaneously through the roller bin body, the heating pipe 19 and the superheated steam, and continuous superheated steam drying is achieved for the fruit pieces.

The exhaust device 7 is a vacuum pump.

The material conveying device 28 is a high-airtight discharge valve.

The above embodiments are only used to help understand the manufacturing method and the core concept of the present invention, and the specific implementation is not limited to the above specific embodiments, and those skilled in the art can make changes without creative efforts from the above concepts, which all fall within the protection scope of the present invention.

Claims

1. A continuous superheated steam drying device comprises a drying bin (1), a heating bin (2), a feeding device (3), a discharging device (4), a roller path (5), an exhaust device (7), a driving device (8), a riding wheel (9), a gear ring (10), a heat-conducting working medium (18) and a heating device (25); the method is characterized in that: the heat energy carried by the heat conducting working medium (18) in the heating bin (2) conducts heat conduction and transfers heat to steam and materials in the drying bin (1) through the roller bin body and the heating pipes (19), moisture generated during material drying is heated through the heat energy conducted by the heat conducting working medium (18) on the roller bin body and the heating pipes (19) to form superheated steam, and the materials are simultaneously conducted with heat conduction and drying through the roller bin body, the heating pipes (19) and the superheated steam.

2. A continuous superheated steam drying plant according to claim 1, characterized in that: the drying bin (1) comprises a roller, a helical blade (23), a heating pipe (19) and a fixing strip (16); the heating pipe (19) and the adjacent heating pipe (19) are fixedly supported by a fixing strip (16).

3. A continuous superheated steam drying plant according to claim 1, characterized in that: the opening end of the heating pipe (19) is fixed in a hole on the drum body; the holes on the roller bin body are flat-opening holes or hot-melt hole type holes.

4. A continuous superheated steam drying plant according to claim 1, characterized in that: the feeding device (3) is arranged on a feeding hole (24) of the drying bin (1); the feeding device (3) comprises a flange joint (21), a sealing device (20), a three-way pipe (26), a material conveying device (28) and a hopper (22); the outlet of the three-way pipe (26) and the flange joint (21) are fixedly and dynamically sealed by a sealing device (20), and the inlet of the three-way pipe (26) and the material conveying device (28) are fixed into a whole; the other end of the material conveying device (28) is provided with a hopper (22); a flange joint (21) of the feeding device (3) is fixedly connected with a feeding hole (24) of the drying bin (1); one end of the air duct (12) is fixed on an exhaust port (29) of the three-way pipe (26), and the other end is fixed on the exhaust device (7).

5. A continuous superheated steam drying plant according to claim 1, characterized in that: the discharging device (4) is arranged on a discharging hole (13) of the drying bin (1); the discharging device (4) comprises a flange joint (21), a sealing device (20), an elbow (27), a material conveying device (28) and a hopper (22); the inlet of the elbow (27) and the flange joint (21) are fixed and dynamically sealed by a sealing device (20); one end of the material conveying device (28) is fixed with the elbow (27) into a whole, and the other end is provided with a hopper (22); a flange joint (21) of the discharging device (4) is fixedly connected with a discharging port (13) of the drying bin (1).

6. A continuous superheated steam drying plant according to claim 1, characterized in that: the exhaust device (7) pumps moisture vapor generated when the material is dried out of the drying bin (1) according to the set pressure of the drying bin (1); the exhaust device (7) is a vacuum unit, or a vacuum pump, or a Roots blower, or a blower, or an air release valve.

7. A continuous superheated steam drying method is characterized in that: firstly, heating a heat-conducting working medium (18) in a heating bin 2 by a heating device (25), wherein the temperature of the heat-conducting working medium (18) is 60-480 ℃;

secondly, the driving device (8) drives the drying bin (1) to rotate on the riding wheel (9) through a gear ring (10);

thirdly, wet materials enter the drying bin (1) through the feeding device (3) on the feeding hole (24) of the drying bin (1), and the materials flow from the feeding hole (24) of the drying bin (1) to the discharging hole (13);

fourthly, heat energy carried by the heat conducting working medium (18) conducts heat conduction and heat transfer to steam and materials in the drying bin (1) through the roller bin body and the heating pipe (19), moisture generated during material drying is conducted on the heat energy of the roller bin body and the heating pipe (19) through the heat conducting working medium (18) to be heated into superheated steam, and the materials are conducted with heat conduction and drying through the roller bin body, the heating pipe (19) and the superheated steam simultaneously;

fifthly, the relative pressure in the drying bin (1) is-0.098-0.3 Mpa, and the materials are dried by high-pressure superheated steam, or by superheated steam which is similar to atmospheric pressure, or by low-pressure superheated steam; the exhaust device (7) pumps moisture vapor generated when the materials are dried out of the drying bin (1) according to the set pressure of the drying bin;

sixthly, discharging the dried material out of the bin through a discharging device (4) on a discharging hole (13) of the drying bin (1).

8. A continuous superheated steam drying method for sludge is characterized in that: the continuous superheated steam drying method of claim 7 is adopted, wherein the relative pressure in the drying chamber (1) is 0.12 Mpa-0.3 Mpa, and the temperature of the heat-conducting working medium (18) is 150 ℃ -480 ℃; heat energy carried by the heat conducting working medium (18) conducts heat conduction and transfers heat to steam and sludge in the drying bin (1) through the roller bin body and the heating pipe (19), moisture generated during sludge drying is heated through the heat energy conducted by the heat conducting working medium (18) on the roller bin body and the heating pipe (19) to form superheated steam, and the sludge is subjected to heat conduction and drying simultaneously through the roller bin body, the heating pipe (19) and the superheated steam.

9. A continuous superheated steam drying method for pasture is characterized in that: the continuous superheated steam drying method of claim 7 is adopted, wherein the relative pressure in the drying chamber (1) is-0.02 Mpa-0.12 Mpa, the temperature of the heat conducting working medium (18) is 100 ℃ -180 ℃, the heat energy carried by the heat conducting working medium (18) conducts heat conduction and heat transfer to the steam and the forage grass in the drying chamber (1) through the roller chamber body and the heating pipe (19), the moisture generated during the drying of the forage grass is conducted on the heat energy on the roller chamber body and the heating pipe (19) through the heat conducting working medium (18) to be heated into superheated steam, and the forage grass is simultaneously conducted with heat conduction and drying through the roller chamber body, the heating pipe (19) and the superheated steam.

10. A continuous superheated steam drying method of fruit slices is characterized in that: the continuous superheated steam drying method of claim 7 is adopted, wherein the relative pressure in the drying chamber (1) is-0.098 MPa to-0.020 MPa, the temperature of the heat conducting working medium (18) is 60 ℃ to 100 ℃, the heat energy carried by the heat conducting working medium (18) conducts heat conduction and heat transfer to the steam and the fruit pieces in the drying chamber (1) through the roller chamber body and the heating pipe (19), the moisture generated during the drying of the fruit pieces is conducted on the heat energy on the roller chamber body and the heating pipe (19) through the heat conducting working medium (18) to be heated into superheated steam, and the fruit pieces are simultaneously conducted with heat conduction and drying through the roller chamber body, the heating pipe (19) and the superheated steam.