CN115435575A - Grain drying system based on graphene far infrared and air convection coupling - Google Patents
Grain drying system based on graphene far infrared and air convection coupling Download PDFInfo
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- CN115435575A CN115435575A CN202210997234.2A CN202210997234A CN115435575A CN 115435575 A CN115435575 A CN 115435575A CN 202210997234 A CN202210997234 A CN 202210997234A CN 115435575 A CN115435575 A CN 115435575A
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- 238000001035 drying Methods 0.000 title claims abstract description 92
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 60
- 230000008878 coupling Effects 0.000 title claims abstract description 13
- 238000010168 coupling process Methods 0.000 title claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 48
- 238000005496 tempering Methods 0.000 claims abstract description 17
- 230000005855 radiation Effects 0.000 claims abstract description 15
- 230000001737 promoting effect Effects 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- -1 graphite alkene Chemical class 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 7
- 238000009423 ventilation Methods 0.000 description 6
- 238000007603 infrared drying Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000007791 dehumidification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B9/00—Preservation of edible seeds, e.g. cereals
- A23B9/08—Drying; Subsequent reconstitution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/06—Grains, e.g. cereals, wheat, rice, corn
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a grain drying system based on graphene far infrared and air convection coupling, which comprises a plurality of stages of drying modules which are sequentially connected in series, wherein each stage of drying module comprises a tempering section, an air outlet section, a graphene far infrared heating section and an air inlet section, and the upper end and the lower end of the air inlet section are provided with the graphene far infrared heating section and the air outlet section; the tempering section is a hollow cavity with an upper opening and a lower opening, the air inlet section comprises an air inlet cavity with an upper opening and a lower opening, an air inlet is arranged on the side wall of one side of the air inlet cavity, air inlet channels which are arranged in one-to-one correspondence with the air inlets are also arranged in the air inlet cavity, each air inlet is communicated with an air inlet channel, the air inlets are connected with an air outlet of the centrifugal fan, the side wall of each air inlet channel is of a porous structure, and the aperture of the porous structure is smaller than the outer diameter of grains; the graphene far infrared heating section comprises a cavity and a plurality of graphene radiation plates which are vertically arranged in the cavity at equal intervals, and the width of a gap between every two adjacent graphene radiation plates is larger than the length of each grain seed; the air outlet section comprises an air outlet cavity with an upper opening and a lower opening and an air outlet pipeline arranged in the air outlet cavity, air outlets at the end parts of the air outlet pipeline are respectively positioned on the opposite side walls of the air outlet cavity, the side walls of the air outlet pipeline are of a porous structure, and the aperture of the porous structure is smaller than the outer diameter of the grain; the air inlet channel and the air outlet pipeline both comprise conical tops, and the jacking direction of the conical tops is opposite to the flowing direction of grains.
Description
Technical Field
The invention relates to a grain drying system based on graphene far infrared and air convection coupling.
Background
To current graphite alkene far infrared grain drying technique, grain heating and ventilation hydrofuge segmentation go on during the drying, there is the poor problem of material heating and top layer hydrofuge matching nature, moisture is discharged to the surface after can not taken away by the air current immediately from the grain inside in the far infrared heating process, must wait to take away its surface moisture by the air current after grain gets into the ventilation hydrofuge passageway, consequently, grain surface moisture concentration is too high in the drying stage, influence the further discharge of the inside moisture of grain, thereby lead to graphite alkene far infrared drying's advantage not to obtain abundant performance, influence the high-efficient utilization of drying process energy and the promotion of drying rate.
Disclosure of Invention
The invention aims to: the invention aims to provide a drying system capable of simultaneously carrying out far-infrared heating drying and ventilation and dehumidification on grains, so that the efficiency and speed of graphene far-infrared drying of grains are improved, and the problem of reduced drying efficiency caused by unsmooth dehumidification of the grain surface layer is avoided.
The technical scheme is as follows: the grain drying system based on graphene far infrared and air convection coupling comprises multiple stages of drying modules which are sequentially connected in series, wherein each stage of drying module comprises a tempering section, an air outlet section, a graphene far infrared heating section and an air inlet section, and the upper end and the lower end of the air inlet section are provided with the graphene far infrared heating section and the air outlet section; the tempering section is a hollow cavity with an upper opening and a lower opening, the air inlet section comprises an air inlet cavity with an upper opening and a lower opening, an air inlet is arranged on the side wall of one side of the air inlet cavity, air inlet channels which are arranged in one-to-one correspondence with the air inlets are also arranged in the air inlet cavity, each air inlet is communicated with an air inlet channel, the air inlets are connected with an air outlet of the centrifugal fan, the side wall of each air inlet channel is of a porous structure, and the aperture of the porous structure is smaller than the outer diameter of grains; the graphene far infrared heating section comprises a cavity and a plurality of graphene radiation plates which are vertically arranged in the cavity at equal intervals, gaps are formed between every two adjacent graphene radiation plates, and the width of each gap is larger than the length of each grain seed; the air outlet section comprises an air outlet cavity with an upper opening and a lower opening and an air outlet pipeline arranged in the air outlet cavity, air outlets at the end parts of the air outlet pipeline are respectively positioned on the opposite side walls of the air outlet cavity, the side walls of the air outlet pipeline are of a porous structure, and the aperture of the porous structure is smaller than the outer diameter of the grain; the air inlet channel and the air outlet pipeline both comprise conical tops, and the jacking direction of the conical tops is opposite to the flowing direction of grains.
The graphene far infrared heating section and the air outlet section which are arranged at the upper end and the lower end of the air inlet section are respectively an upper air outlet section, an upper graphene far infrared heating section, a lower graphene far infrared heating section and a lower air outlet section; treat that dry grain gets into drying module, after the tempering section of flowing through in proper order, last air-out section, last graphite alkene far infrared heating section, air inlet section, lower graphite alkene far infrared heating section and air-out section down, flow out this level of drying module.
The cross sections of the air inlet channel and the air outlet pipeline are triangular, inverted V-shaped or pentagonal, the inverted V-shaped is preferred, on one hand, materials are saved, on the other hand, materials can smoothly flow downwards through the two slope surfaces, and the circular or other shapes easily cause the materials to be retained on the air pipes.
Wherein, the corresponding cone angle of the conical top parts of the air inlet channel and the air outlet channel is 60-70 degrees. The angle can enable grain to smoothly slide down, so that grain is not retained on the slope surface of the air pipe, and meanwhile, the angle is also favorable for saving the space occupied by the air pipe.
The air inlet channel and the air outlet pipeline are arranged in parallel, and the arrangement direction of the air inlet channel is perpendicular to the arrangement direction of the graphene radiation plate. The air pipe and the heating plate are vertically arranged so as to keep the drying conditions of all the grain seeds consistent and ensure the uniformity of grain drying.
Wherein the height of the tempering section corresponding to the hollow cavity is 600-800 mm; the height of the air outlet section corresponding to the air outlet cavity is 200-300 mm; the height of the cavity corresponding to the graphene far infrared heating section is 400-420 mm; the height of the air inlet section corresponding to the air inlet cavity is 400-500 mm; the average moving speed of the grains in the drying module is 5-15 cm/min. The grain moves too fast and can lead to the excessive wearing and tearing of graphite alkene far infrared radiation board, and grain removes too slowly and then leads to grain seed grain drying time that is heated overlength, and grain seed grain inside forms too big moisture difference, and the internal stress that leads to is greater than repairable yield limit.
The grain flow control module is positioned below the multistage series drying modules; the feeding module sends grain into multistage drying module of establishing ties in proper order through promoting transport module and dries, the moisture content of grain is detected in the sampling after the drying, meet the standard when detecting grain moisture content, then unload through the module of unloading dry grain through promoting transport module, it is not conform to the standard to detect grain moisture content, then dry in the multistage drying module of establishing ties in proper order of grain recirculation entering through promoting transport module, the rate of movement of grain in drying module is controlled to the rotational speed of impeller in through control grain flow control module.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages: (1) According to the drying module, the tempering section is arranged in the module, the buffer time and the drying time ratio of the grain seeds flowing through the module are limited, and the moving speed of the grain is controlled at the same time, so that the gradient of moisture in the grain during heating and drying is effectively eliminated, the phenomenon of waist bursting and cracking of the grain during heating and drying can be effectively prevented, and when the gradient of moisture in the grain is effectively eliminated, the heating temperature of the grain can be increased (the phenomenon of waist bursting and cracking can not occur at about 60 ℃), so that the drying time is shortened, and the drying efficiency is improved; (2) According to the drying module disclosed by the invention, far infrared irradiation and air convection are coupled, so that the grain far infrared heating and ventilation and dehumidification are simultaneously carried out, the moisture transferred from the interior of grains to the surfaces of the grains is quickly taken away by air flow, the efficiency and speed of graphene far infrared drying of grains are improved to the greatest extent, and the problem that the graphene far infrared drying capacity is reduced due to unsmooth moisture removal of the surface layers of the grains in the prior art is solved.
Drawings
FIG. 1 is a schematic structural diagram I of a drying module;
FIG. 2 is a schematic diagram II of the drying module;
FIG. 3 is a schematic structural diagram of a graphene far infrared heating section;
FIG. 4 is a schematic view of the connection between the centrifugal fan and the air inlet chamber;
FIG. 5 is a partial cross-sectional view of the intake section;
FIG. 6 is a schematic structural view of the air outlet section;
FIG. 7 is a side view of the air outlet section;
fig. 8 is a system schematic of the drying system of the present invention.
Detailed Description
As shown in fig. 1 to 7, the grain drying system based on graphene far infrared and air convection coupling of the present invention includes a plurality of stages of drying modules 10 connected in series in sequence, each stage of drying module 10 includes a tempering section 4, an air outlet section 1, a graphene far infrared heating section 2 and an air inlet section 3, the upper and lower ends of the air inlet section 3 are respectively provided with a graphene far infrared heating section 2 and an air outlet section 1, which are respectively an upper air outlet section 1-1, an upper graphene far infrared heating section 2-1, a lower graphene far infrared heating section 2-2 and a lower air outlet section 1-2; the tempering section 4 is a hollow cavity 41 with an upper opening and a lower opening, the air inlet section 3 comprises an air inlet cavity 32 with an upper opening and a lower opening, an air inlet is arranged on the side wall of one side of the air inlet cavity 32, air inlet channels 31 which are arranged in one-to-one correspondence to the air inlets are also arranged in the air inlet cavity 32, each air inlet is communicated with the air inlet channel 31, and the air inlet is connected with an air outlet of the centrifugal fan 5; the cross section of the air inlet channel 31 is inverted V-shaped, the angle corresponding to the inverted V-shaped air inlet channel 31 is 60-70 degrees, the side wall of the air inlet channel 31 is provided with a dense porous structure, and the aperture of the porous structure is smaller than the outer diameter of grains; the air inlet section 3 is internally provided with two rows of 12 air inlet channels 31, each row of 6 air inlet channels 31, and every four adjacent air inlet channels 31 form a group and are connected with a centrifugal fan 5, and air is blown inwards by the centrifugal fan 5, so that the ventilation conditions of the air inlet channels 31 are basically consistent; the graphene far infrared heating section 2 comprises a cavity 22 and a plurality of graphene radiation plates 21 which are vertically arranged in the cavity 22 at equal intervals, a gap is formed between every two adjacent graphene radiation plates 21, and the width of the gap is larger than the length of three grain seeds; the air outlet section 1 comprises an air outlet cavity 12 with an upper opening and a lower opening and an air outlet pipeline 11 arranged in the air outlet cavity 12, air outlets 13 at the end parts of the air outlet pipeline 11 are respectively positioned on the opposite side walls of the air outlet cavity 12, the side walls of the air outlet pipeline 11 have dense porous structures, and the pore diameter of the porous structures is smaller than the outer diameter of grains; the cross section of the air outlet pipeline 11 is in an inverted V shape, the corresponding angle of the inverted V-shaped air outlet pipeline 11 is 60-70 degrees, both ends of the air outlet pipeline 11 are open and communicated with the atmosphere, and wet air flow is discharged into the atmosphere from both ends of the air outlet pipeline 11; the lifting direction of the air inlet channel 31 and the conical top of the air outlet pipeline 11 is opposite to the flowing direction of grains. The air inlet channel 31 and the air outlet pipeline 11 are arranged in parallel, and the arrangement direction of the air inlet channel 31 is perpendicular to that of the graphene radiation plate 21. Grains to be dried enter the drying module 10 and flow through the tempering section 4, the upper air outlet section 1-1, the upper graphene far infrared heating section 2-1, the air inlet section 3, the lower graphene far infrared heating section 2-2 and the lower air outlet section 1-2 in sequence and then flow out of the drying module.
If no air pipe is arranged in the air inlet section 3 and the air outlet section 1, the air flow cannot uniformly penetrate through the grain pile, the drying effect of the drying device cannot be achieved, and the corresponding drying effect cannot be achieved even if the air blower blows air inwards by multiple times.
As shown in fig. 8, the drying system of the present invention further comprises a feeding module, a lifting and conveying module, a grain flow direction control module, a grain flow control module and a discharging module, wherein the grain flow control module is located below the drying modules connected in series in multiple stages; the feeding module sends grain into multistage drying module of establishing ties in proper order through promoting transport module and dries, the moisture content of grain is detected in the sampling after the drying, meet the standard when detecting grain moisture content, then unload through the module of unloading of the grain that promotes transport module with drying, it is not conform to the standard to detect grain moisture content, then dry in the multistage drying module of establishing ties in proper order of grain recirculation entering through promoting transport module, the rotational speed of impeller controls the translation rate of grain in drying module in the control module of grain flow control. The grain flow control module structure used by the invention is consistent with the synchronous grain discharge module structure in the patent with the publication number of CN 113632833A.
The height of the tempering section 4 of each stage of drying module 10 corresponding to the hollow cavity is 800mm; the height of the air outlet section 1 corresponding to the air outlet cavity is 200mm; the height of the cavity corresponding to the graphene far infrared heating section 2 is 400mm; the height of the air inlet section 3 corresponding to the air inlet cavity is 500mm; the average moving speed of the grain in the drying module is 10cm/min.
The buffering time and the drying time of the grain seeds in the drying system are close to 1:1, the control is realized by controlling the silo capacity of the tempering section to be approximately equal to the sum of the silo capacities of the air inlet section, the air outlet section and the graphene heating section.
The working process of the drying system comprises the following steps: after the loading is finished, the drying operation state is entered after the grain materials are filled with all the drying modules, the grain materials sequentially pass through the drying modules from top to bottom and are conveyed to the top module through the hoister to be continuously dried until the grain materials reach the stored moisture and then are discharged out of the dryer through the top grain flow direction controller and the discharging mechanism. In each stage of drying module 10, air flow enters the air inlet pipe 31 distributed in the air inlet section 3 under the action of the centrifugal fan 5, dense small round holes are formed in the wall of the air inlet pipe, and the diameter of each round hole is smaller than the minimum size of grains (so that the grains are prevented from passing through the small round holes). Under the action of wind pressure, an air flow passes through the wall of an air inlet pipe and then is divided into an upper stream and a lower stream, the upper stream flows upwards to enter a graphene far infrared heating section 2 positioned above an air inlet section 3, and acts on grain grains filled between far infrared heating plates (radiation plates) 21 together with far infrared radiation, so that moisture discharged from the interior of the grains to the surface is immediately taken away by the air flow flowing through the grain grains, the air flow passes through the graphene far infrared heating section 2 positioned above the air inlet section 3 and then continues to enter an upper air outlet section 1-1, and the air flow is discharged out of a drying module from an air outlet pipe 11 distributed in the upper air outlet section 1-1; similarly, the lower air flow flowing downwards enters the graphene far infrared heating section 2 below the air inlet section 3 and acts on grain grains filled between the far infrared heating plates 21 together with far infrared radiation, so that moisture discharged to the surface from the interior of the grain grains is immediately taken away by the air flow flowing through the grain grains, the air flow continuously enters the lower air outlet section 1-2 after passing through the graphene far infrared heating section 2 below the air inlet section 3, and the air flow is discharged out of the drying module from the air outlet pipes 11 distributed in the lower air outlet section 1-2. In the process, the grains are always in the maximum filling state in the tempering section 4, the two air outlet sections 1, the two graphene far infrared heating sections 2 and the air inlet section 3 and continuously and slowly flow downwards.
For three batches of grain seeds with the same weight (10 tons) and the same initial water content (the initial water content is 20%), three different drying systems are adopted for drying until the water content is 14%, and the results are as follows: the drying time required by the traditional hot air circulation drying is 10-12 h, and the heat utilization rate is 30-50%; the drying system disclosed in publication No. CN113632833A requires 7-8 hours of drying time and 60-70% of heat utilization rate, and the drying system of the invention requires 4-6 hours of drying time and 70-80% of heat utilization rate. Compared with a drying system with the publication number of CN113632833A, the drying module disclosed by the invention has the advantages that the far infrared irradiation and the air convection are coupled, so that the far infrared heating, ventilation and moisture removal of grains are realized at the same time, the moisture transferred from the insides of the grains to the surfaces of the grains is quickly taken away by the air flow, and the drying efficiency is greatly improved.
Claims (7)
1. The utility model provides a grain drying system based on graphite alkene far infrared and air convection coupling which characterized in that: the drying device comprises multiple stages of drying modules (10) which are sequentially connected in series, wherein each stage of drying module (10) comprises a tempering section (4), an air outlet section (1), a graphene far infrared heating section (2) and an air inlet section (3), and the upper end and the lower end of the air inlet section (3) are respectively provided with the graphene far infrared heating section (2) and the air outlet section (1); the tempering section (4) is a hollow cavity (41) with an upper opening and a lower opening, the air inlet section (3) comprises an air inlet cavity (32) with an upper opening and a lower opening, an air inlet is formed in the side wall of one side of the air inlet cavity (32), air inlet channels (31) which are arranged in one-to-one correspondence to the air inlets are further arranged in the air inlet cavity (32), each air inlet is communicated with one air inlet channel (31), the air inlet is connected with an air outlet of the centrifugal fan (5), the side wall of each air inlet channel (31) is of a porous structure, and the aperture of the porous structure is smaller than the outer diameter of grains; the graphene far infrared heating section (2) comprises a cavity (22) and a plurality of graphene radiation plates which are vertically arranged in the cavity (22) at equal intervals, gaps are formed between every two adjacent graphene radiation plates (21), and the width of each gap is larger than the length of each grain seed; the air outlet section (1) comprises an air outlet cavity (12) with an upper opening and a lower opening and an air outlet pipeline (11) arranged in the air outlet cavity (12), air outlets (13) at the end parts of the air outlet pipeline (11) are respectively positioned on the opposite side walls of the air outlet cavity (12), the side walls of the air outlet pipeline (11) are of a porous structure, and the aperture of the porous structure is smaller than the outer diameter of grains; the air inlet channel (31) and the air outlet pipeline (11) comprise conical tops, and the jacking direction of the conical tops is opposite to the flowing direction of grains.
2. The graphene far infrared and air convection coupling based grain drying system of claim 1, wherein: the graphene far infrared heating section (2) and the air outlet section (1) arranged at the upper end and the lower end of the air inlet section (3) are respectively an upper air outlet section (1-1), an upper graphene far infrared heating section (2-1), a lower graphene far infrared heating section (2-2) and a lower air outlet section (1-2); the grain to be dried enters the drying module (10), flows through the tempering section (4), the upper air outlet section (1-1), the upper graphene far infrared heating section (2-1), the air inlet section (3), the lower graphene far infrared heating section (2-2) and the lower air outlet section (1-2) in sequence, and then flows out of the drying module.
3. The graphene far infrared and air convection coupling based grain drying system according to claim 1, wherein: the cross sections of the air inlet channel (31) and the air outlet pipeline (11) are in one of a triangle shape, an inverted V shape or a pentagon shape.
4. The graphene far infrared and air convection coupling based grain drying system according to claim 3, wherein: the corresponding taper angles of the tapered tops of the air inlet channel (31) and the air outlet channel (11) are 60-70 degrees.
5. The graphene far infrared and air convection coupling based grain drying system of claim 3, wherein: the air inlet channel (31) and the air outlet pipeline (11) are arranged in parallel, and the arrangement direction of the air inlet channel (31) is perpendicular to that of the graphene radiation plate (21).
6. The graphene far infrared and air convection coupling based grain drying system according to claim 1, wherein: the height of the tempering section (4) corresponding to the hollow cavity is 600-800 mm; the height of the air outlet section (1) corresponding to the air outlet cavity is 200-300 mm; the height of the cavity corresponding to the graphene far infrared heating section (2) is 400-420 mm; the height of the air inlet section (3) corresponding to the air inlet cavity is 400-500 mm; the average moving speed of the grains in the drying module is 5-15 cm/min.
7. The graphene far infrared and air convection coupling based grain drying system of claim 1, wherein: the grain flow control device also comprises a feeding module, a lifting and conveying module, a grain flow direction control module, a grain flow control module and a discharging module, wherein the grain flow control module is positioned below the drying modules (10) which are connected in series in multiple stages; the feeding module sends grain into multistage drying module of establishing ties in proper order through promoting transport module and dries, the moisture content of grain is detected in the sampling after the drying, meet the standard when detecting grain moisture content, then unload through the module of unloading of promoting transport module with dried grain, it is not conform to the standard to detect grain moisture content, then dry in the multistage drying module of establishing ties in proper order of grain recirculation entering through promoting transport module, the slew velocity of impeller controls grain in drying module through control grain flow control module.
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