阅读说明：本技术 一种基于石墨烯远红外加热的粮食循环干燥机及其干燥方法 (Grain circulating dryer based on graphene far-infrared heating and drying method thereof ) 是由 谢焕雄 颜建春 魏海 吴惠昌 高学梅 游兆延 张会娟 刘敏基 王建楠 杜元杰 于 2021-08-03 设计创作，主要内容包括：本发明公开一种基于石墨烯远红外加热的粮食循环干燥机及其干燥方法,每相邻两个远红外加热组件和通风排湿组件均上下间隔设置,储粮组件设置于沿高度方向从上到下的第一个远红外加热组件的上方,最后一个通风排湿组件与其底部的集料斗之间设有同步排粮模块；集料斗内的粮食物料通过螺旋输送器和提升机输送至提升机顶部,然后通过粮流方向控制器调整粮食物料是进入卸料管排出干燥机还是进入储粮组件再次干燥。本发明根据石墨烯材料通电后低温发射红外线的原理,其发射源表面温度40～80℃范围内可精确调节,利用能够直接与粮食物料接触的特性,充分提高干燥品质、效率,降低生产成本。(The invention discloses a grain circulating dryer based on graphene far-infrared heating and a drying method thereof.A grain storage component is arranged above a first far-infrared heating component from top to bottom along the height direction, and a synchronous grain discharging module is arranged between the last ventilating and dehumidifying component and a collecting hopper at the bottom of the last ventilating and dehumidifying component; grain materials in the collecting hopper are conveyed to the top of the elevator through the spiral conveyor and the elevator, and then the grain flow direction controller is used for adjusting whether the grain materials enter the discharge pipe to be discharged out of the dryer or enter the grain storage assembly to be dried again. According to the principle that the graphene material emits infrared rays at low temperature after being electrified, the surface temperature of an emission source can be accurately adjusted within the range of 40-80 ℃, the drying quality and efficiency are fully improved by utilizing the characteristic of direct contact with grain materials, and the production cost is reduced.)

1. The utility model provides a grain circulation desiccator based on graphite alkene far infrared heating which characterized in that: comprises a lifter, a grain storage component, a collecting hopper, a spiral conveyor, a plurality of far infrared heating components and a ventilation and dehumidification component; every two adjacent far infrared heating assemblies and ventilation and dehumidification assemblies are arranged at intervals up and down, the grain storage assembly is arranged above the first far infrared heating assembly from top to bottom in the height direction, and a synchronous grain discharge module is arranged between the last ventilation and dehumidification assembly and a collecting hopper at the bottom of the last ventilation and dehumidification assembly;

grain materials in the collecting hopper are conveyed to the top of the hoister through the spiral conveyor and the hoister, and then the grain materials are adjusted to enter the discharging pipe to be discharged out of the drier or enter the grain storage assembly to be dried again through the grain flow direction controller;

the far infrared heating assembly comprises a first outer wall heat insulation plate and a plurality of graphene far infrared irradiation plates, the first outer wall heat insulation plate forms a heat insulation inner cavity, each graphene far infrared irradiation plate is vertically arranged in the heat insulation inner cavity at equal intervals, a first vertical channel is formed between every two adjacent graphene far infrared irradiation plates, grain materials downwards enter the ventilation and dehumidification assembly along the first vertical channels, and a certain distance is reserved between the top of each graphene far infrared irradiation plate and the top of the corresponding assembly and between the top of the corresponding first outer wall heat insulation plate and the top of the corresponding graphene far infrared irradiation plate;

the ventilation and dehumidification assembly comprises a centrifugal fan and a plurality of air pipes vertically arranged at intervals, a plurality of ventilation holes are formed in each air pipe, a plurality of second vertical channels are formed between the air pipes, grain materials fall into the second vertical channels, air flow enters the air inlet duct after being driven by the centrifugal fan, then enters the second vertical channels from the air inlet duct and ventilates and dehumidifies the grain materials in the second vertical channels.

2. The graphene far-infrared heating based grain circulation dryer as claimed in claim 1, wherein: the ventilation and dehumidification assembly comprises a centrifugal fan, an air inlet duct, an air outlet duct and an air control valve, wherein a plurality of air pipes are transversely arranged between the air inlet duct and the air outlet duct, an air outlet of the centrifugal fan is connected to an air inlet of the air inlet duct, the air inlet duct is communicated with all odd number air pipes, all even number air pipes are communicated with the air outlet duct, an air control valve is arranged at an air outlet of the air outlet duct, an air return pipeline is further arranged at one end of the air control valve, and the other end of the air return pipeline is connected to an air inlet of the centrifugal fan.

3. The graphene far-infrared heating based grain circulation dryer as claimed in claim 2, wherein: and a squirrel cage structure is arranged at one end of the air return pipeline close to the centrifugal fan.

4. The graphene far-infrared heating based grain circulation dryer as claimed in claim 1, wherein: the distance between every two adjacent graphene far-infrared irradiation plates in the far-infrared heating assembly is 1-4 cm.

5. The graphene far-infrared heating based grain circulation dryer as claimed in claim 1, wherein: the arrangement direction of the graphene far infrared irradiation plates in the far infrared heating assembly is in heterotopic orthogonality with the arrangement direction of the air pipes in the ventilation and dehumidification assembly.

6. The graphene far-infrared heating based grain circulation dryer as claimed in claim 1, wherein: the synchronous grain discharging module comprises an outer frame and a plurality of partition plates arranged in the outer frame at intervals, corresponding channels are respectively formed between the wall surface of the outer frame and the partition plates and between two adjacent partition plates, the even number of channels from outside to inside in the formed channels are grain channels, and grain discharging rollers are arranged in the grain channels; the second vertical channel between the grain channel and the air pipe is in vertical position correspondence, and a second outer wall heat insulation plate is arranged on the outer side of the outer frame.

7. The graphene far-infrared heating based grain circulation dryer as claimed in claim 1, wherein: and the centrifugal fans of the ventilation and dehumidification components are fixedly installed through the fan frame.

8. A grain circulating drying method based on graphene far infrared heating is characterized by comprising the following steps: the method comprises the following steps:

when the dryer starts to work, the hoister sends grain materials to the top of the dryer, the grain flow direction controller controls the grain materials to enter the grain storage assembly at the top and then sequentially and uniformly enter the far infrared heating assemblies and the ventilation and dehumidification assemblies below the grain storage assembly, and after all the far infrared heating assemblies and the ventilation and dehumidification assemblies are filled with the grain materials, the synchronous grain discharge module is started;

arrange grain roller in the synchronous row grain module at the uniform velocity under transmission system's effect and rotate, and then make the material in far infrared heating element and the dehumidification subassembly that ventilates evenly move down, the grain material of synchronous row grain module output gets into the collecting hopper, then transports to storing up the grain subassembly again by screw feeder and then lifting machine to and get into far infrared heating element and ventilate the dehumidification subassembly and carry out the drying, promptly: circulating the grain material in the dryer until the drying is finished;

after the drying and receiving are finished, the grain material is controlled by the grain flow direction controller to enter the discharge pipe.

9. The graphene far-infrared heating-based grain circulating drying method according to claim 8, characterized in that: in the drying process, each graphene far-infrared irradiation plate in the far-infrared heating assembly continuously emits far-infrared rays under the driving of current, grain materials slowly flow downwards along a first vertical channel between the graphene far-infrared irradiation plates, the grain materials in each channel are uniformly subjected to far-infrared continuous irradiation in the process, and water in the materials is migrated to the surface of the grain materials; then the grain material enters the ventilation and moisture removal assembly, the moisture on the surface of the material is absorbed by the air flow and is discharged, and finally the grain material enters the next far infrared heating assembly downwards or sequentially passes through the aggregate hopper, the spiral material conveyor, the elevator and the grain storage assembly to reach the first far infrared heating assembly.

Technical Field

The invention belongs to the technology of dryers, and particularly relates to a grain circulating dryer based on graphene far-infrared heating and a drying method thereof.

Background

In recent years, the large-scale planting and mechanized harvesting technology in China is rapidly developed, the harvesting of a plurality of grain materials is concentrated day by day, and medium and large-scale drying equipment is needed to rapidly dry the materials. Grain drying equipment on the existing market is mostly based on hot air drying technologies such as cross flow drying, forward flow drying, mixed flow drying, forward and reverse flow drying, because these prior art adopt hot air drying, the cereal surface is at first with hot-blast contact, cereal heat transfer direction is opposite with moisture migration direction, the cereal top layer is earlier dried the solidification and can be hindered inside moisture and outwards migrate, leads to the ubiquitous following technical problem of these driers: slow drying rate, easy grain waist explosion during drying, uneven drying, high energy consumption, relatively low energy efficiency, serious waste heat and waste gas emission and the like.

For example, application No. 201810621095.7 discloses a circulation grain drier, which uses traditional hot air, and has high energy consumption, and in addition, the hot air chamber and the air exhaust chamber are arranged side by side in the same horizontal direction, and each layer needs a feeding mode of feeding, resulting in uneven drying of the whole grains and low efficiency.

The other heating mode, far infrared radiation, is also widely applied to agricultural product drying, is different from the traditional hot air drying, heat is transferred from the inside of grains to the outside during the far infrared irradiation drying, the direction is consistent with the moisture migration direction, the problem that the moisture inside the grains is blocked from migrating outwards due to the fact that the surface layer of the grains is firstly dried and solidified during the hot air drying can be avoided, therefore, the energy required by the moisture migration and vaporization inside the far infrared drying grains is far lower than that of the traditional hot air drying, and the drying efficiency and the production rate can be effectively improved.

However, the existing infrared drying equipment mainly adopts a catalyst far infrared emitter, emits infrared rays to thin-layer grains by a high-temperature (400-800 ℃) heating body (low temperature control precision and slow response speed), the high-temperature heating body cannot be contacted with materials, the requirement on the equipment structure is extremely high, and in addition, because a high-temperature heat source is adopted to emit infrared light waves, the grain irradiation instantaneous intensity is high, the irradiation duration is short, the problems of uneven drying, low quality and the like are easily caused.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to solve the defects in the prior art and provide a grain circulating dryer based on graphene far-infrared heating and a drying method thereof, the surface temperature of an emission source is accurately adjusted within the range of 40-80 ℃ through low-temperature far-infrared emission, the emission source can be directly contacted with grain materials to fully improve the drying quality and efficiency, the production cost is reduced, open fire and smoke emission in grain drying are avoided, and green production in the drying link in grain processing is realized.

The technical scheme is as follows: the invention relates to a grain circulating dryer based on graphene far-infrared heating, which comprises a lifter, a grain storage assembly, a collecting hopper, a spiral conveyor, a plurality of far-infrared heating assemblies and a ventilation and dehumidification assembly, wherein the lifter is arranged on the grain storage assembly; every two adjacent far infrared heating components and ventilation and dehumidification components are arranged at intervals up and down, the grain storage component is arranged above (from top to bottom along the height direction) the first far infrared heating component, and a synchronous grain discharge module is arranged between the last ventilation and dehumidification component and a collecting hopper at the bottom of the last ventilation and dehumidification component; grain materials in the collecting hopper are conveyed to the top of the hoister through the spiral conveyor and the hoister, and then the grain materials are adjusted to enter the discharging pipe to be discharged out of the drier or enter the grain storage assembly to be dried again through the grain flow direction controller; the far infrared heating assembly comprises a first wall heat insulation plate and a plurality of graphene far infrared irradiation plates, the first outer wall heat insulation plate forms a heat insulation inner cavity, the graphene far infrared irradiation plates are vertically arranged in the heat insulation inner cavity at equal intervals, a first vertical channel is formed between every two adjacent graphene far infrared irradiation plates, and grain materials enter the ventilation and dehumidification assembly downwards along the first vertical channels; the ventilation and dehumidification assembly comprises a centrifugal fan and a plurality of air pipes vertically arranged at intervals, a plurality of ventilation holes are formed in each air pipe, a plurality of second vertical channels are formed among the air pipes, grain materials fall into the second vertical channels, air flow enters the air inlet duct through the driving of the centrifugal fan, then enters the second vertical channels (namely, the grain channels) from the air inlet duct, and ventilates and dehumidifies the grain materials in the second vertical channels.

Here, be equipped with the certain distance between graphite alkene far infrared irradiation board top and the subassembly top of its place and the first outer wall heated board top, form the local cavity that arouses by upper portion hydrofuge wind channel in first vertical passageway when can avoiding the material to fill the back to flow like this.

The graphene far infrared irradiation plate is formed by packaging a graphene film through organic glass.

In the actual circulation drying process, as long as the dryer is powered on and started, each graphene far infrared irradiation plate directly generates infrared rays to heat.

In order to improve the ventilation and dehumidification efficiency, the ventilation and dehumidification assembly comprises a centrifugal fan, an air inlet duct, an air outlet duct and an air valve, wherein a plurality of air pipes (for example, 11 polygonal air pipes are sequentially arranged) are transversely arranged between the air inlet duct and the air outlet duct, an air outlet of the centrifugal fan is connected to an air inlet of the air inlet duct, the air inlet duct is communicated with all odd number air pipes, all even number air pipes are communicated with the air outlet duct, an air control valve is arranged at an air outlet of the air outlet duct, a return air pipeline is further arranged on the air control valve, and the other end of the return air pipeline is connected to an air inlet of the centrifugal fan.

In order to reduce energy consumption and improve drying efficiency, a squirrel cage structure is arranged at one end, close to the centrifugal fan, of the air return pipeline, and the centrifugal fan can suck recovered hot air and fresh air.

Further, two marginal tuber pipe structures between air inlet duct and the exhaust duct are the same, and even be equipped with ventilation hole and the design of roof leanin on the roof and the bottom plate of marginal tuber pipe seal, the lateral wall promptly, and marginal tuber pipe is whole to be the quadrangle: other middle tuber pipe structures between air inlet duct and the exhaust airway are the same, and the roof of middle tuber pipe is triangle-shaped promptly, evenly is provided with the ventilation hole on the lateral wall of both sides and the bottom seals, and middle tuber pipe is whole to be the pentagon. There is certain distance between each wind channel top and the hydrofuge subassembly top to be used for being full of the material to the grain material of conveniently following discharge in the graphite alkene far infrared heating subassembly evenly gets into this ventilation hydrofuge subassembly. The air pipes with the two structural designs enable grain materials falling from the far infrared heating assembly to uniformly enter and be fully distributed in each second vertical channel, air flow of the centrifugal fan enters the second vertical channels (grain channels) from air pipe ventilation holes communicated with the air inlet channel, and moisture on the surface layer of grain seeds is rapidly removed.

Furthermore, the distance between every two adjacent graphene far infrared irradiation plates in the far infrared heating assembly is 1-4 cm, and water in the grain seeds is efficiently transferred from inside to outside in the drying process.

In order to ensure that all grain materials of the far infrared heating assembly flow into the ventilation and dehumidification assembly in the same mode, the drying and ventilation efficiency and quality are improved, and the arrangement direction of the graphene far infrared irradiation plates in the far infrared heating assembly is in heterotopic orthogonality with the arrangement direction of the air pipes in the ventilation and dehumidification assembly. The graphene far infrared irradiation plate is at a certain distance from the top end of the heating assembly; the top end of the air pipe inside the ventilation drying component has a certain distance with the top end of the ventilation dehumidifying component.

Furthermore, the synchronous grain discharging module comprises an outer frame and a plurality of partition plates arranged in the outer frame at intervals, corresponding channels are respectively formed between the wall surface of the outer frame and the partition plates and between two adjacent partition plates, the even number of the formed channels counted from outside to inside are grain channels, grain discharging rollers are arranged in the grain channels, and no grain and air pass through all the odd number of channels; the grain channel corresponds to the second vertical channel between the air pipes, and each grain discharging roller is driven to turn over in the grain channel by controlling the transmission system, so that grain materials falling from the last ventilation and moisture discharging assembly enter the material collecting hopper; and a second outer wall heat insulation plate is arranged on the outer side of the outer frame.

Furthermore, the centrifugal fans of the ventilation and dehumidification assemblies are fixedly installed through the fan frame.

The invention also discloses a grain circulating drying method based on graphene far infrared heating, which comprises the following steps: when the dryer starts to work, the hoister sends grain materials to the top of the dryer, the grain flow direction controller controls the grain materials to enter the grain storage assembly at the top and then sequentially and uniformly enter the far infrared heating assemblies and the ventilation and dehumidification assemblies below the grain storage assembly, and after all the far infrared heating assemblies and the ventilation and dehumidification assemblies are filled with the grain materials, the synchronous grain discharge module is started; arrange grain roller in the synchronous row grain module at the uniform velocity under transmission system's effect and rotate, and then make the material in far infrared heating element and the dehumidification subassembly that ventilates evenly move down, the grain material of synchronous row grain module output gets into the collecting hopper, then transports to storing up the grain subassembly again by screw feeder and then lifting machine to and get into far infrared heating element and ventilate the dehumidification subassembly and carry out the drying, promptly: circulating the grain material in the dryer until the drying is finished; after drying is finished, the grain material is controlled by the grain flow direction controller to enter the discharge pipe.

In the drying process, each graphene far-infrared irradiation plate in the far-infrared heating assembly continuously emits far-infrared rays under the driving of current, grain materials slowly flow downwards along a first vertical channel between the graphene far-infrared irradiation plates, the grain materials in each channel are uniformly subjected to far-infrared continuous irradiation in the process, and water in the materials is migrated to the surface of the grain materials; then the grain material enters the ventilation and moisture removal assembly, the moisture on the surface of the material is absorbed by the air flow and is discharged, and finally the grain material enters the next far infrared heating assembly downwards or sequentially passes through the aggregate hopper, the spiral material conveyor, the elevator and the grain storage assembly to reach the first far infrared heating assembly.

Has the advantages that: compared with the prior art, the invention has the following advantages:

(1) according to the invention, the graphene far infrared irradiation plates are used as low-temperature far infrared emission sources and are arranged in the heat-preservation inner cavity of the dryer at equal intervals, and the grain materials flow between two adjacent graphene far infrared irradiation plates and are heated and dried, so that the drying energy consumption is low, and the drying is uniform and the quality is high;

(2) after the moisture in the grains of the grain is transferred to the surface layer, the moisture on the surface can be quickly removed through the ventilation and dehumidification assembly;

(3) the invention can circularly dry grain materials in multiple layers, has large mass, high efficiency and low waist explosion rate, and has important significance for realizing the technical innovation of grain drying mechanization.

(4) The invention can effectively maintain the quality of grain materials (such as grains) while rapidly reducing the water content of the grain materials, so that the dried grains maintain excellent quality, including reducing the cracking rate of the rice and the gelatinization of starch in the drying process, and improving the rate of the whole polished rice.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a schematic view of a far infrared heating assembly of the present invention;

FIG. 4 is a partial schematic view of FIG. 3;

FIG. 5 is a schematic view of the venting and dehumidifying module of the present invention;

FIG. 6 is a cross-sectional view of an air duct of the present invention;

FIG. 7 is a schematic view of the return air duct of the present invention;

FIG. 8 is a schematic view of the installation positions of the far infrared heating assembly and the ventilation and dehumidification assembly in the present invention;

FIG. 9 is a schematic view of a synchronous grain discharge module according to the present invention;

FIG. 10 is a schematic view of the installation positions of the ventilation and dehumidification assembly and the synchronous grain discharge module in the invention;

FIG. 11 is a schematic view of a collection hopper according to the present invention;

FIG. 12 is a flow chart of a drying method of the present invention.

Detailed Description

The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.

As shown in fig. 1, the graphene far-infrared heating-based grain circulation dryer of the present embodiment includes a hoisting machine 3, a grain storage component 8, a collecting hopper 4, a spiral material conveyer 2, a plurality of far-infrared heating components 6, and a ventilation and dehumidification component 5; every two adjacent far infrared heating components 6 and the ventilation and dehumidification components 5 are arranged at intervals up and down, the grain storage component 8 is arranged above the first far infrared heating component 6, and a synchronous grain discharge module 11 is arranged between the last ventilation and dehumidification component 5 and the collecting hopper 4 at the bottom of the last ventilation and dehumidification component; grain materials in the collecting hopper 4 are conveyed to the top of the elevator 3 through the spiral conveyor 2 and the elevator 3, and then the grain materials are adjusted to enter the discharging pipe 7 to be discharged out of the dryer or enter the grain storage assembly 8 for drying again through the grain flow direction controller 10; the far infrared heating assembly 6 comprises a first outer wall insulation board 12 and a plurality of graphene far infrared irradiation boards 14, the first outer wall insulation board 12 forms an insulation inner cavity, the graphene far infrared irradiation boards 14 are vertically arranged in the insulation inner cavity at equal intervals, a first vertical channel is formed between every two adjacent graphene far infrared irradiation boards 14, and grain materials downwards enter the ventilation and dehumidification assembly 5 along the first vertical channels; the ventilation and dehumidification assembly 5 comprises a centrifugal fan 24 and a plurality of air pipes vertically arranged at intervals, a plurality of ventilation holes are formed in each air pipe, a plurality of second vertical channels are formed between the air pipes, grain materials fall into the second vertical channels, air flow is driven by the centrifugal fan 24 to enter the second vertical channels through the air inlet duct 15, and the grain materials filled in the second vertical channels are ventilated and dehumidified.

The graphene far infrared irradiation plate emits infrared rays at low temperature after being electrified, the surface temperature of an emission source is not higher than 80 ℃, the drying quality and efficiency are fully improved by utilizing the characteristic of direct contact with grain materials, and the production cost is reduced.

As shown in fig. 2 and fig. 3, in this embodiment, the heat-insulating inner cavity of the far-infrared heating assembly 6 is composed of four first outer-wall heat-insulating boards 12, and each graphene far-infrared irradiation board 14 is embedded therein, so that it can be ensured that the heat of the far-infrared heating assembly 6 is not lost in the drying process to the maximum extent, the energy consumption is reduced, and the drying efficiency is improved.

As shown in fig. 4, in order to improve the ventilation and dehumidification efficiency, the ventilation and dehumidification assembly 5 includes a centrifugal fan 24, an air inlet duct 15, an air outlet duct 20 and an air valve, wherein a plurality of air pipes are transversely disposed between the air inlet duct 15 and the air outlet duct 20, an air outlet of the centrifugal fan 24 is connected to an air inlet of the air inlet duct 15, the air inlet duct 15 is communicated with all odd number air pipes, all even number air pipes are communicated with the air outlet duct 20, the air outlet of the air outlet duct 20 is provided with the air valve, the air valve is further provided with an air return pipe 23, and the other end of the air return pipe 23 is connected to an air inlet of the centrifugal fan 24. Two edge air pipes 18 (quadrangle) between the air inlet duct 15 and the air outlet duct 20 have the same structure, namely, the top plate and the bottom plate of the edge air pipes 18 are closed, the side walls are uniformly provided with vent holes, and the top plate is designed to be inclined inwards: the other middle air pipes 19 (pentagon) between the air inlet duct 15 and the air outlet duct 20 have the same structure, that is, the top plate of the middle air pipe 19 is triangular, the side walls at two sides are uniformly provided with vent holes, and the bottom is closed. The air pipes with two structural designs enable the grain materials falling from the far infrared heating component 6 to uniformly enter and be distributed in second vertical channels (namely grain channels) among the air pipes, and the air flow of the centrifugal fan 24 enters the grain channels through the corresponding air pipes and contacts with grain seeds therein, and then the moisture on the surface layer of the grain seeds is rapidly removed.

In this embodiment, as shown in fig. 5 to 7, 11 polygonal air ducts are provided, and the bottom plates of all the air ducts are solid plates; wherein, the top plates of the first edge air pipe 18 and the last edge air pipe 18 are in a quadrangle which is inclined inwards, and a plurality of vent holes are arranged on the side wall of one side; the cross sections of the top plates of other middle air pipes 19 are isosceles triangles, and a plurality of vent holes are arranged on the side walls of the two sides.

As shown in fig. 6, in this embodiment, the 11 air ducts are sequentially marked as air ducts a to K (where the air ducts a and K are entirely quadrilateral, and the air ducts B to J are pentagonal), the air flow is driven by the centrifugal fan 24 and then enters the air inlet duct 15, the air inlet duct 15 is respectively communicated with the air ducts a, the air ducts C, the air ducts E, the air ducts G, the air ducts I and the air ducts K, and the air flow freely enters the air ducts a, the air ducts C, the air ducts E, the air ducts G, the air ducts I and the air ducts K from the air inlet duct 15. In addition, because tuber pipe B, tuber pipe D, tuber pipe F, tuber pipe H and tuber pipe J communicate with exhaust airway 20 respectively, consequently the air current passes the grain layer (the vertical passageway of second between each tuber pipe promptly) after entering tuber pipe A, tuber pipe C, tuber pipe E, tuber pipe G, tuber pipe I and tuber pipe K, takes away grain material surface moisture and then gets into tuber pipe B, tuber pipe D, tuber pipe F, tuber pipe H and tuber pipe J, gets into exhaust airway 20 at last.

In the above process, the surface temperature of the grain material is reduced, and the heat is mainly used for evaporating water on the surface and heating air. In addition, because the water yield of the grain materials is high in the initial drying stage, the air valve is completely opened, and the wet air flowing out of the exhaust duct 20 is directly exhausted into the atmosphere; when the water yield of the grain is relatively low in the middle and later drying periods, in order to avoid that the fresh air contacts with the grain to take away excessive heat and cause unnecessary heat loss, the air valve is not opened completely, but is controlled by the air valve controller 22 to be opened only by a certain angle, and air flow discharged from the exhaust duct 20 by a part of air is recovered according to ventilation humidity (a temperature and humidity sensor can be arranged to detect temperature and humidity, the recovery is started when the temperature is 3 ℃ of the ambient temperature and the relative humidity is lower than 70%, and the recovery amount is determined according to the temperature and humidity of return air flow), the return air duct 23 is used, as shown in fig. 7, a squirrel cage structure 16 on the return air duct 23 is favorable for the centrifugal fan 24 to suck the recovered air and the fresh air, and the recovered air is mixed with the fresh air to enter the centrifugal fan 24 to mechanically dry the grain materials.

The cage structure 16 on the return duct can be provided as a cylindrical enclosure structure with air circulating through the gap in the enclosure, or other cage structure designed to facilitate the passage of air.

The frame lateral wall all can set up second heated board 13 on the subassembly 5 of dehumidifying ventilates in this embodiment, can guarantee that the heat of each group's far infrared heating subassembly 6 and subassembly 5 of dehumidifying by ventilation is difficult for scattering and disappearing from top to bottom, improves holistic drying efficiency.

In this embodiment, the distance between every two adjacent graphite alkene far infrared irradiation boards 14 is 1~4cm in the far infrared heating element 6, if the distance is too little then can influence the material flow, and this distance is too big then can make the material that is located intermediate position of intermediate layer flow process down be difficult for being close to the far infrared irradiation board, consequently and can not obtain effective drying. For example, when rice is dried, the width of the interlayer is 3cm, the interlayer can be suitable for smooth flowing of rice, materials in the center of the interlayer are always positioned at the position, close to the middle, of the interlayer due to too large distance, effective drying cannot be achieved, the drying effect is affected, and then moisture in the grain seeds can be efficiently transferred from inside to outside in the drying process. As shown in fig. 8, in order to ensure that all the grain materials of the far infrared heating assembly 6 flow into the ventilation and dehumidification assembly 5 in the same manner, and improve the drying and ventilation efficiency and quality, the arrangement direction of the graphene far infrared irradiation plates 14 in the far infrared heating assembly 6 is in heterotopic orthogonality with the arrangement direction of the air pipes in the ventilation and dehumidification assembly 5.

As shown in fig. 9 and 10, the synchronous grain discharging module 11 of the present embodiment includes an outer frame and a plurality of partition plates 29 disposed in the outer frame at intervals, corresponding channels are respectively formed between the wall surface of the outer frame and the partition plates 29 and between two adjacent partition plates 29, and even channels from outside to inside among the formed channels are grain channels, in which grain discharging rollers 28 are disposed, and no grain and air passes through all the odd channels; and the grain channel corresponds to the second vertical channel between the air pipes, and the grain discharging rollers 28 are driven to turn over in the grain channel and the grain flowing speed is controlled by the control transmission system, so that the grain materials falling from the last ventilation and dehumidification component 5 enter the collecting hopper 4. Here, 20 partitions 29 are provided, which are respectively denoted as partitions a to t. The arrangement direction of the partition plates 29 is the same as that of the air ducts in the ventilation and dehumidification module 5.

The top of the grain storage component 8 is provided with a fence 9.

As shown in fig. 2 and 11, in order to increase the stability of the whole circulation dryer, the centrifugal fan 24 of each set of ventilation and dehumidification modules 5 is fixedly installed through the fan frame 1. To increase the stability, the collecting hopper 4 of the present embodiment is fixed under the last ventilation and dehumidification module 5 and the synchronous grain discharging module 11 by the frame 30.

As shown in fig. 12, the method for drying grain in a circulating manner based on graphene far-infrared heating of the present embodiment includes the following steps: when the dryer starts to work, the hoister 3 sends grain materials to the top of the dryer, the grain flow direction controller 10 controls the grain materials to enter the grain storage assembly 8 at the top and then sequentially and uniformly enter the far infrared heating assemblies 6 and the ventilation and dehumidification assemblies 5 at the lower part, and after all the far infrared heating assemblies 6 and the ventilation and dehumidification assemblies 5 are filled with the grain materials, the synchronous grain discharge module 11 is started; the grain discharging roller 28 in the synchronous grain discharging module 11 rotates at a constant speed under the action of the transmission system, so that the materials in the far infrared heating assembly 6 and the ventilation and dehumidification assembly 5 move downwards uniformly, grain materials output by the synchronous grain discharging module 11 enter the collecting hopper 4, then are conveyed to the grain storage assembly 8 again by the spiral material conveyer 2 and the lifter 3, and enter the far infrared heating assembly 6 and the ventilation and dehumidification assembly 5 for drying, namely, the grain materials circularly flow in the dryer until the drying is finished; after drying, the grain material is controlled by the grain flow direction controller 10 to enter the discharge pipe 7.

In the process, as the grain storage component is arranged above the uppermost far infrared heating component, all the materials flow in the self-flowing angle range under the self-gravity and mutual friction action of the grain materials (such as rice). And the box design of this storage grain subassembly has sufficient length for its bottom also is in cereal flowing angle scope certainly, consequently as long as lie in the grain discharging rod constant velocity motion of bottommost just can guarantee that corn gets into far infrared heating element and ventilation hydrofuge subassembly uniformly.

In addition, because far infrared heating element 6 and ventilation hydrofuge subassembly 5 are dystopy cross arrangement, (ventilation hydrofuge subassembly 5 upper end has a section distance not to contain the wind channel, and the department is used for the packing material, in order to avoid appearing the cavity that causes because of far infrared heating element thickness in the vertical passageway of below second), consequently to each seed grain that flows out from graphite alkene far infrared heating element 6, the state and the flow path that get into hydrofuge ventilation mould subassembly 5 are unanimous basically, consequently grain material can flow into ventilation hydrofuge subassembly 5 from far infrared heating element 6 uniformly, and flow into far infrared heating element 6 from hydrofuge ventilation subassembly 5 uniformly.

Wherein, be equipped with six far-infrared heating element 6 and six ventilation hydrofuge subassemblies 5 altogether (specific figure sets up according to the dry capacity demand), can furthest improve dry material volume. Dispose sufficient capacity's storage grain subassembly 8 above first far infrared heating element 6, under grain material self action of gravity, the material is in the angle of flow scope downward flow gradually that flows gradually, it can be full of whole bottom cross-section to flow when storing up grain subassembly 8 bottoms, can make grain evenly get into first far infrared heating element 6, guarantee evenly to be full of grain material in the first vertical passageway between each graphite alkene far infrared irradiation board 14, synchronous grain discharging module 11 of last a set of hydrofuge subassembly below can ensure that far infrared heating element 6 and hydrofuge ventilation assembly 5 different region grain ways's grain flow velocity is unanimous basically.

In the drying process, each graphene far-infrared irradiation plate 14 in the far-infrared heating assembly 6 continuously emits far-infrared rays under the drive of current, grain materials slowly flow downwards along a first vertical channel between the graphene far-infrared irradiation plates 14, the grain materials in each channel are uniformly subjected to far-infrared continuous irradiation in the process, internal molecules in the materials absorb irradiation energy and convert the irradiation energy into internal energy, so that the internal temperature of grain seeds is higher than the temperature of an outer surface layer, internal moisture rapidly migrates to the outside under the drive of temperature gradient and internal vapor pressure, and the moisture in the materials is gathered on the surface of the grain seeds; and then the grain materials enter a ventilation and moisture removal component 5, so that the moisture on the surfaces of the materials is absorbed by air flow and discharged, and finally the grain materials downwards enter a next far infrared heating component 6 or sequentially pass through a collecting hopper 4, a spiral material conveyer 2, a lifting machine 3, a grain storage component 8 to a first far infrared heating component 6.

In short, the grain materials are rapidly dried by the far infrared heating component 6 and the ventilation and dehumidification component 5 under the combined action of temperature gradient and steam pressure driven moisture migration, rapid removal of surface moisture and the like. The drying quality, speed, efficiency and energy efficiency of the method are far superior to those of the traditional hot air drying.