821 results about "Grain drying" patented technology

The invention relates to the field of grain drying, and discloses a grain drying energy-saving control system based on intelligent optimization, which comprises the following steps: after warehousing grains are detected, judging whether the water content of the grains exceeds a preset safety threshold value or not by collecting the initial water content of the grains and environment temperature and humidity information; according to the grain moisture content, the grain size distribution and the current environment condition, a multi-section type moisture change trend model fitting the drying process is constructed, and the decrease rate of the grain moisture content and the drying curve form in the future stage are predicted; analyzing the deviation value between the water content change slope and the target drying rate in the prediction curve; judging whether an adjustment potential exists or not by modeling a response relationship among the current hot air temperature, wind speed, heat source power and water content change; and according to the heat energy use analysis result, control instructions of hot air temperature, air speed and air supply modes are automatically generated. The self-adaptive energy-saving grain dryer has the advantage that the self-adaptive capacity and the energy-saving effect in the grain drying process are improved.

The invention discloses a control method, device and equipment of a grain dryer and a storage medium, and relates to the technical field of automatic control, and the control method of the grain dryer comprises the following steps: obtaining a target data set, and dividing the target data set into a training set and a test set; using the training set to train a support vector regression model, and performing optimization through a grey wolf optimization strategy to obtain an initial moisture content prediction model; testing the initial moisture content prediction model by using the test set to obtain a target moisture content prediction model; and controlling the grain dryer by using a model prediction control strategy and the target moisture content prediction model. By predicting the change trend of the grain moisture content and adjusting the operation parameters of the grain dryer, the grain is kept within the target moisture content range, and the grain drying process is accurately controlled, so that the efficiency of the drying process and the product quality are improved, and the benefits of stable drying of the grain and the production cost are ensured.

A vacuum drying apparatus has a rigid bin structure within a flexible membrane liner arranged to store particulate material therein. An exhaust passage and air inlet passage communicate through the envelope in sealed relationship with the envelope. The air inlet passage is adjustably flow restricted relative to the exhaust passage so as to enable a flow through material in the liner when applying vacuum pressure to the exhaust passage, for example using a centrifugal fan. The air inlet passage communicating with an upper manifold within the upper portion of the bin structure and the exhaust passage communicating with a lower manifold within a lower portion of the bin structure.

The present application discloses a grain drying device, including a support frame, a drying box, a conveying device, a lifting device, a spiral conveying device, a heating component and a control system, wherein the drying box is arranged on the support frame, a vent is arranged at the top of the drying box, the conveying device is arranged on the support frame, and the output end of the conveying device extends into the drying box; the lifting device is vertically arranged in the drying box, and the bottom of the lifting device is connected with the output end of the conveying device; the spiral conveying device is arranged spirally around the lifting device, and the top of the spiral conveying device is connected with the top of the lifting device, and the bottom of the spiral conveying device is connected with the output end of the conveying device, wherein a downwardly inclined discharge pipe is arranged on the drying box and below the top of the spiral conveying device. Thus, the grain to be dried can be quickly and fully contacted with the heated air in a short time, effectively shortening the drying time, improving the drying efficiency, and thus effectively saving energy consumption and cost.

The invention relates to the technical field of grain drying equipment, in particular to a low-temperature recycling type efficient energy-saving grain drying machine which comprises an air inlet channel, an air outlet channel, a rotational flow filtering mechanism and an adsorption filtering mechanism. The air inlet channel is connected with an air inlet system; the air outlet channel is connected with an exhaust system; the rotational flow filtering mechanism is arranged in the air outlet channel; the adsorption filtering mechanism is connected with the rotational flow filtering mechanism; water and dust particles in high-temperature waste gas are separated and then directly introduced into the evaporator, the evaporator is heated and then introduced into the heat exchanger to be heated, the filtered and heated gas flows through the outer surface of a channel where the waste gas passes, and redundant heat of the filtered and heated gas is transferred to the waste gas; waste heat recovery is achieved, and the temperature of gas entering the drying tower is controlled to be appropriate; the problems that when dust exists in grains, dried damp and hot waste gas carries the dust to be discharged, and the heat exchange efficiency is gradually reduced when the waste gas carrying the dust is recycled are solved.

The invention relates to the technical field of grain drying, in particular to a sealing structure of a gas-phase rotary heat exchanger and the gas-phase rotary heat exchanger. The sealing structure comprises a rotary shell and gas flow distribution chambers externally embedded in the two ends of the rotary shell, and first annular butt joint grooves are formed in one ends of the inner walls of the two gas flow distribution chambers; second annular butt joint grooves are formed in one ends of the outer walls of the two airflow distribution chambers, first moving rings are fixed to the two ends of the rotating shell, the ends of the first moving rings are attached to the interiors of the first annular butt joint grooves, and sealing shaft sleeves are attached to the gaps between the exteriors of the first moving rings and the inner walls of the second annular butt joint grooves. The rotary shell can be embedded in the airflow distribution chamber to form a sealing structure of the gas-phase rotary heat exchanger, the loss amount of hot fluid at the joint of the rotary shell and the airflow distribution chamber is fully reduced, the heat exchange efficiency of the gas-phase rotary heat exchanger is guaranteed, and the sealing effect of the gas-phase rotary heat exchanger is improved.

The invention relates to the technical field of grain processing, in particular to a grain drying parameter regulation and control system based on correlation analysis, which comprises an identification module for acquiring and processing running state information of a grain dryer and physical attributes of grains and identifying the types of the grains; the strategy module is used for generating a corresponding drying strategy according to the initial physical attributes of the grains and the external environment information; the adjusting module is used for adjusting working parameters of the grain drying machine in real time; the monitoring module is used for monitoring the drying process of the grain drying machine; and the display module is used for displaying the processed running state information and the drying process of the grain drying machine. According to the method, the image information and the physical attributes of the grains are obtained, the grain types are accurately recognized through the machine learning algorithm, therefore, the drying efficiency and quality can be improved, meanwhile, the drying parameters are dynamically adjusted according to the real-time data and the external environment information, and it is further ensured that the drying process is in the optimal state all the time.

The invention relates to the technical field of grain drying, and discloses a circulating drying grain dryer which comprises a drying oven and a grain distributing assembly slidably arranged in an inner cavity of the drying oven, the grain distributing assembly divides the interior of the drying oven into an upper cavity and a lower cavity, namely a tempering layer and a drying chamber, and a heat conduction plate is assembled on the bottom wall of the drying chamber; a conveying assembly located between the grain distributing assembly and the heat conducting plate is arranged in the drying chamber, a heating assembly is installed at the bottom of the drying oven, an impurity removing assembly capable of connecting the heating assembly with the drying chamber is arranged on one side of the drying oven, and a waste removing assembly located on the periphery of the tempering layer is assembled on the top of the drying oven. A grain receiving hopper used for receiving grain discharged by the drying oven is installed below the heating assembly. Integrated grain drying operation of automatic grain separation, grain dredging and falling and intelligent impurity removal of grains in the drying oven is achieved, namely, during continuous grain separation and drying, a sieve plate is automatically dredged, rice husks mixed in the grains are removed, and continuous and efficient operation of the grain drying operation is guaranteed.

The invention discloses a true accumulated temperature calculation method suitable for continuous grain drying machine operation process control, and relates to the technical field of grain drying process control, and the method comprises the steps: firstly, determining a working performance parameter set of a grain drying machine, and then in the working process of the grain drying machine, calculating the working performance parameter set of the grain drying machine; selecting any section of complete grain drying process as a drying process window of a to-be-calculated true accumulated temperature value, forming a time unit matrix by time units of the to-be-dried grains passing through each drying section during the drying process window aiming at the drying process window, and calculating the true accumulated temperature value of the to-be-calculated true accumulated temperature value based on the time unit matrix and the whole-process temperature matrix of the grain dryer. And the true accumulated temperature value of the to-be-dried grain during the drying process window period can be calculated. According to the method, the true accumulated temperature value of the continuous drying process is calculated, the true accumulated temperature is the true reaction of the grain heating process, the change of grain characteristics and quality in the drying process can be better reflected by taking the true accumulated temperature as the control factor of the continuous grain drying process, and the control effect is more ideal.

The invention provides a grain drying device, relates to the field of grain drying equipment, and aims to solve the problems of high hot air resistance, high fan energy consumption and high grain drying cost due to the fact that inlet air adopts one-in and one-out downstream flow or countercurrent flow in the conventional grain drying process. In order to solve the problems of low tempering frequency, low drying efficiency and poor grain quality due to adoption of a mixed flow mode in the existing grain drying process, three adjacent rows of corner boxes are adopted as a group, the middle row of corner boxes in the same group forms an air inlet channel, the upper row and the lower row of corner boxes in the same group are exhaust channels, and the thickness of a grain layer between the adjacent rows of corner boxes is reduced, so that the wind resistance is reduced, and the grain quality is improved. A tempering area is formed between every two adjacent corner combining boxes, multiple times of tempering of the grains are achieved, heat is transferred from outside to inside, moisture is transferred from inside to outside more sufficiently, and therefore the quality of the dried grains is guaranteed.

The invention discloses an anti-blocking control system and control method for a grain elevator and grain drying equipment, the anti-blocking control system comprises a first rotating speed detection device and a control device, the first rotating speed detection device is used for detecting the rotating speed of the elevator, and the control device is in signal connection with the first rotating speed detection device and a grain stirring wheel. And the control device is configured to control and reduce the rotating speed of the grain stirring wheel under the condition that the rotating speed of the elevator is determined to be reduced according to the detection result of the first rotating speed detection device, so that unsmooth conveying at the elevator can be relieved or avoided until the conveying returns to normal, the subsequent blockage phenomenon can be avoided without increasing the structure of the elevator, and the production efficiency is improved. The purpose of avoiding cost increase is achieved.

The conveying device for grain processing and production relates to the technical field of grain processing and comprises a grain feeding head, a blocking rod is fixedly arranged at the edge position of the inner side of the grain feeding head, a butt joint is fixedly arranged at the end, away from the grain feeding head, of the blocking rod, and a limiting fixing groove is fixedly formed in the outer side of the end, away from the blocking rod, of the butt joint. The outer side of the limiting fixing groove is slidably sleeved with a grain discharging barrel, and an impurity opening and a rotating sleeve are rotationally arranged on the side, symmetrical to the grain drying machine, of the middle of the grain discharging barrel. According to the conveying device for grain processing and production, by arranging the electromagnetic ring, the electromagnetic controller and other parts and electrifying the electromagnet, impurities such as iron nails and iron wires in flowing grains in the pipeline are captured and prevented from entering precise equipment such as a crusher and a pulverizer, equipment abrasion is avoided, the service life of the equipment is prolonged, and the cost is reduced; iron impurities are prevented from being mixed into the grains, and the quality of the grains is guaranteed.

The invention relates to the technical field of grain drying equipment, in particular to a hot air supply device for a low-temperature circulating grain dryer, which comprises an air inlet channel, an air supply device and an angular box, the air inlet channel comprises a tempering channel, a drying channel and a cooling channel; the tempering channel is connected with the upper layer of the tower body; the drying channel is connected with the tower body middle layer; the cooling channel is connected with the lower layer of the tower body; the air supply device is connected with the air inlet channel; the angular box is connected with the tower body; a hot air inlet channel is divided into three layers, the flow speed of hot air in the middle layer is the highest, the circulation area of a drying channel can be automatically reduced along with the increase of the humidity of the exhaust side, the air inlet speed of dry hot air is higher, moisture can be rapidly taken away, the number of horn-shaped boxes for exhaust is larger than that of horn-shaped boxes for air inlet, and the air exhaust amount in unit time is increased; the problem that the drying effect on the side close to an exhaust channel is poor due to the fact that the humidity of the hot air inlet side of the drying chamber is low and the humidity of the exhaust side is high is solved.

The invention relates to the technical field of grain drying equipment, in particular to an electric rapid grain discharging device of a grain dryer and an intelligent control method, and the electric rapid grain discharging device comprises a grain storage bin, a grain distributing assembly, a conveying assembly and an intelligent regulation and control unit. The grain distributing assembly achieves flexible grain discharging through a rotating disc and an adjusting ring, the conveying assembly adopts a conveying belt with protruding strips to prevent grain from sliding, and the intelligent regulation and control unit combines multi-sensor data and a fuzzy logic algorithm to dynamically adjust the grain discharging speed and flow. Through structure optimization and intelligent control, the grain discharging efficiency, stability and adaptability are remarkably improved, the problems of unstable flow and low intelligent degree in the prior art are solved, and reliable technical support is provided for modernized agricultural production.

The invention relates to a waste vinasse drying treatment method. The method comprises the following steps: carrying out mechanical pressure filtration on original waste vinasse provided in batches in a solid-liquid separation manner; dehydrating the waste distiller's grains in a manner of removing moisture in the waste distiller's grains and gas influencing the caking rate; and screening the high-fiber waste vinasse and the heated and dehydrated waste vinasse separated from the organic matter-enriched waste vinasse based on a protein content differential separation mode to obtain oversize products for pyrolysis and undersize products for feed. According to the method, more moisture is reserved in the waste distiller's grains with high caking rate in mechanical filter pressing, the water in the waste distiller's grains can enable the waste distiller's grains to be agglomerated more easily, meanwhile, the high heat capacity characteristic of water can provide more uniform heat conduction for the waste distiller's grains, and the situation that the internal and external dehydration uniformity is not uniform due to local overheating of the waste distiller's grains is avoided.

The invention relates to a heat pump drying system and a drying control method. The method comprises the steps that real-time operation data in the grain drying process is obtained; performing coupling calculation on the real-time operation data based on a pre-trained grain drying heat pump kinetic model to obtain a drying prediction factor; and according to a comparison result between the drying prediction factor and the real-time operation data, the output power of the heat pump set is dynamically adjusted. Performing coupling calculation on real-time operation data in a grain drying process through the grain drying heat pump kinetic model to obtain a drying prediction factor, and dynamically adjusting the output power of the heat pump group according to a comparison result between the drying prediction factor and the real-time operation data to obtain a drying prediction result. Therefore, accurate identification and accurate judgment of the drying process, the drying degree and the drying effect of the grains are realized, further accurate control of the drying operation of the grains is realized, and the method has wide applicability.

The invention relates to the technical field of grain drying equipment, in particular to a grain drying tower turning plate grain discharging device which comprises a drying cylinder, a feeding port is formed in the top end of the drying cylinder, a material conveying assembly is arranged in the drying cylinder and comprises a rotating column, a tray, a discharging hopper and a sliding frame, and a discharging assembly is arranged in the drying cylinder and comprises a rotating column, a tray, a discharging hopper and a sliding frame. The discharging assembly comprises an iron plate, a rotating plate and an iron rod, a driving assembly is further arranged in the drying barrel, and the driving assembly comprises an air cylinder, a rack, a rotating shaft, a gear, a supporting rod, a magnet, a sliding plate, a second spring and a transverse plate. According to the grain drying device, the amount of grains during drying each time can be controlled, the grains can be uniformly layered, the dried grains can be rapidly discharged, only the grains need to be poured and the grains discharged from the bottom of the drying barrel need to be recycled in the whole process, and the other steps can be automatically completed through starting of the air cylinder.

The utility model discloses a movable grain drying device which comprises a vehicle body, a lifting device, a grain barrel, a conveying device and a drying assembly, the lifting device comprises a first frame body and a second frame body, and a feeding port and a driven shaft are arranged at the bottom of the first frame body; a driving shaft, a first discharging port, a second discharging port and a discharging baffle are arranged at the top of the second frame body, the grain barrel comprises a first barrel body, a second barrel body and a third barrel body which are sequentially arranged in a sleeving mode from outside to inside, a second telescopic assembly is arranged on the outer side of the grain barrel, and a grain discharging device is arranged at an outlet in the bottom of the first barrel body. The two ends of the conveying device are matched with the grain discharging device and the first frame body respectively, the drying assembly comprises a hot air assembly and a drying cylinder, and the drying cylinder is installed in the grain cylinder. The grain barrel can stretch out and draw back, and the lifting device can be bent, so that the grain drying machine is small in size, low in height, convenient to move and transport and high in grain drying efficiency.

A system configured to collect a representative sample of dried grain from an industrial grain dryer to inform the dryer's automatic temperature controller includes: a plurality of drop tubes each having a top end and a bottom end, wherein the top end of each drop tube is communicatively coupled to a respective dump chute of the grain dryer and configured to receive a respective partial grain sample from the dump chute; connective tubing communicatively coupling the bottom ends of the plurality of drop tubes; an air blower communicatively coupled to a proximal end of the connective tubing, wherein the air blower is configured to propel the partial grain samples distally through the connective tubing; and a collection box communicatively coupled to a distal end of the connective tubing, wherein the collection box is configured to receive and aggregate the partial grain samples into a combined sample for moisture testing.

The utility model discloses a grain drying and overturning device which comprises a base, first fixing frames are symmetrically and fixedly installed on the top of the base, fixing rings are fixedly installed on the tops of the first fixing frames, annular grooves are formed in the middles of the fixing rings, drying cylinders are installed on the tops of the two fixing rings, the drying cylinders are arranged in an inclined mode, and the drying cylinders are arranged in the annular grooves. Round rotating blocks are symmetrically and fixedly installed on the outer side of the drying cylinder and rotationally connected with the annular grooves, second fixing frames are symmetrically and fixedly installed at the two ends of the base, the drying cylinder and a push plate are driven to rotate through operation of a motor, the push plate pushes grains in the drying cylinder to increase the contact area of the grains in the drying cylinder and hot air, and the grain drying efficiency is improved. The grain drying effect is improved, through staggering of the push plates and contact between the push plates and the inner wall of the drying cylinder, when the grains in the drying cylinder are pushed in a staggered mode, the grains adhering to the inner wall of the drying cylinder can be pushed, and the situation that the grains with much moisture adhere to the inner wall of the drying cylinder is prevented.

The utility model provides a grain thickness tidying device for a grain drying tower, which comprises a grain drying tower body, a grain thickness tidying device, a grain thickness tidying device and a grain thickness tidying device, the middle section of the grain containing frame is fixed to the side wall of the grain drying tower body, and the two sides of the grain containing frame are each provided with a grain falling opening; the thickness adjusting assembly is arranged on the upper surface of the grain containing frame; and the grain pushing rod is arranged above the thickness adjusting assembly and moves in the length direction of the grain drying tower body so as to push the grains higher than the thickness adjusting assembly to the grain falling openings, and the grain falling openings are formed in the two sides of the grain containing frame. After the thickness of the grain is adjusted by the thickness adjusting assembly, the grain on the current layer is limited, then the grain falling from the upper portion of the grain pushing rod is pushed into the grain containing frame on the next layer through the grain pushing rod, multi-layer drying can be achieved in the same manner, the thickness of the grain on each layer can be adjusted, and the grain drying efficiency is high.

The utility model discloses a grain drying device for agricultural production, which belongs to the field of grain drying equipment and comprises a drying box and a drying frame. The drying frame is formed by mutually building a plurality of beam bodies; a plurality of drying plates are horizontally arranged on the drying frame in the vertical direction of the drying frame. A linear driving assembly is assembled in the drying box. According to the grain drying device for agricultural production, through mutual movement cooperation of a plurality of components in the linear driving assembly, when the sliding block base moves, the connecting plate connected with the sliding block base drives the overturning assembly to do synchronous reciprocating linear movement, and at the moment, through reciprocating movement of a plurality of overturning shafts arranged in the overturning assembly, the grain drying effect is greatly improved. Through the arrangement of the ball head end, grains on the drying and airing plate can be turned over in a reciprocating mode through movement of the ball head end, the heating seat is matched for heating air, finally, the grains placed on the drying and airing plate can be evenly turned over and dried, meanwhile, manual operation is reduced, and efficient drying is achieved.

The invention discloses an energy-saving damp and hot airflow drying and air supplementing device for grain drying. A damp and hot air opening, a direct air supplementing opening, a hot air supplementing opening, an air return opening and a dehumidification opening are sequentially formed in a shell from bottom to top. The porous core column is installed in the shell and provided with at least one direct air supplementing channel and at least one damp and hot air channel, an air inlet of the direct air supplementing channel is communicated with the direct air supplementing opening, an air outlet of the direct air supplementing channel is communicated with the air return opening, and an air inlet of the damp and hot air channel is communicated with the damp and hot air opening; the breathable heat accumulator is installed in the shell, an air outlet channel of the breathable heat accumulator communicates with an air outlet of the humid and hot air channel and the dehumidification opening, and an air inlet channel of the heat accumulator communicates with the hot air supplementing opening and the air return opening. The device adopts a means of simultaneously storing moisture removal and air supply, does not cause the fluctuation of the pressure of a drying system, and is suitable for large-scale or long-stroke multi-point airflow moisture removal and drying work; in addition, on the basis of the waste heat recovery function, fresh air supplemented to the outside is heated, the heat loss is small, and the utilization rate is high.

The utility model provides a multi-stage grain drying device, which relates to the technical field of grain multi-stage drying and comprises a box body, a main mesh belt conveying part, a receiving section, a lifting section, a feeding section, a mounting groove, a feeding hopper, a distributing hopper, a spreading plate, a sub mesh belt conveying part, a discharge port, a dehumidifying pipeline and a hot air pipeline, according to the device, the main mesh belt conveying part and the sub mesh belt conveying parts can be stacked, so that the occupied area of the drying device can be reduced, the mounting convenience is improved, popularization and use are facilitated, grains can be effectively prevented from falling to the bottom of the box body through the main mesh belt conveying part and the sub mesh belt conveying parts with different widths, and the grain drying efficiency is improved. Therefore, grains can be stably dried on the main mesh belt conveying part and the sub mesh belt conveying parts, loss of the grains is reduced, the thickness of the grains on the main mesh belt conveying part and the sub mesh belt conveying parts can be controlled according to the moisture content of the grains, and a good drying effect on the grains is ensured.

The invention discloses a grain drying on-line moisture monitoring method and system, and relates to the technical field of grain drying. A moisture sensor is installed at a grain discharging section of drying equipment; when the drying equipment works, online multi-point correction is carried out when the instrument displays moisture data; after grain feeding of the drying equipment is finished, circularly operating for set time, and sampling after moisture display is stable; when the error between the moisture displayed by the instrument and the actual moisture reaches a set condition, correcting the error; and when the water content in the drying equipment is lower than a preset alarm value, the grain discharge standard is reached. According to the invention, the moisture content of uniformly flowing grain particles can be accurately and continuously measured in the production process, and the monitoring data is closest to the actual drying result; the original drying tower structure is not influenced, and the automation degree of the grain drying process is improved.

The invention discloses a grain drying system and a grain drying process. The grain drying system comprises a conveying system, a drying system and a warehousing system, the conveying system comprises a plurality of grain unloading pits, a drum screen and a plurality of wet granaries, the first elevator transfers grains in the grain unloading pits into the drum screen, the second elevator transfers unprocessed grains treated by the drum screen to the first belt conveyor, and the first belt conveyor transfers unprocessed grains provided by different grain unloading pits into the corresponding wet granaries; the drying system comprises a dust removal chamber, a plurality of grain drying machines and a grain feeding scraper arranged in the dust removal chamber, the second belt conveyor receives unprocessed grains output by the wet granary, and the third elevator receives the unprocessed grains on the second belt conveyor and transfers the unprocessed grains into the corresponding grain drying machines according to different wet granaries; the warehousing system comprises a dry granary, the in-granary transportation mechanism transfers grains in the grain dryer into the dry granary, and the out-granary transportation mechanism transfers the grains in the dry granary into the grain transport vehicle. The grain drying device can improve the grain drying efficiency.

The invention relates to the technical field of drying processing, in particular to an automatic drying device and method for grain processing, and the automatic drying device comprises a base, a roller, an adjusting unit and a hot air unit. According to the grain drying machine, the length of a material curtain raised by grains in the accumulation area is reduced by means of the adjusting unit, namely, the uniformity of the raised grains is reduced, the material curtain formed when the second raising plate raises the grains in the middle drying area is uniform and is in the maximum length, the grains are uniformly dispersed and dried, and the drying efficiency is improved. Therefore, the problem that grains are overheated due to the fact that the grains are excessively raised close to a hot air area is avoided, and internal and external common drying is formed through a hot air cylinder, an air outlet sleeve and an auxiliary heating ring in the hot air unit. Meanwhile, in the middle drying area, it is ensured that hot air still has heat needed for drying after flowing from right to left by means of heat transferred into the auxiliary heating ring after the roller is heated, and the drying effect of the middle drying area (away from a large amount of hot air outlet area) on the grains is improved.

The utility model relates to the technical field of agricultural product drying, and provides a waste gas circulation heat energy recovery dryer which comprises a drying bin and a hot gas circulation system. The hot air circulation system comprises a centrifugal dehumidifier used for separating water and impurities in hot air; one end of the moisture pipe is connected with the drying bin air outlet, and the other end of the moisture pipe is connected with the moisture inlet of the centrifugal dehumidifier; one end of the dry air pipe is connected with an air outlet of the centrifugal dehumidifier; the fan is used for driving hot air in the drying bin to flow into one end of the moisture pipe; an air outlet of the heater is communicated with an air inlet of the drying bin, and an air inlet of the heater is connected with a circulating valve and communicated with the other end of the dry air pipe through the circulating valve. The grain drying device has the advantages that in the grain drying process, drying waste gas is recycled, few impurities exist after drying, the safe water content of grains can be achieved, waste heat of the waste gas is recycled, energy consumption of equipment for gas processing is reduced, and energy is saved.

The invention belongs to but is not limited to the technical field of grain drying equipment, and discloses a ventilation corner box and double-side grain feeding combined drying system which comprises a ventilation corner box module and a double-side grain feeding anti-blocking elevator module. The ventilation corner box modules are installed in the drying bin and arranged in multiple layers in the vertical direction, the arrangement directions of every two adjacent layers of ventilation corner boxes are perpendicular, the ventilation corner boxes on one layer are transversely arranged, the ventilation corner boxes on the next layer are longitudinally arranged, and a criss-cross structure is formed. A plurality of air uniformizing devices are arranged in the transverse air inlet angle boxes arranged in the length direction of the drying bin at intervals, and ventilation holes are formed in the side walls of the two ends of the longitudinal air outlet angle boxes arranged in the width direction of the drying bin. The double-side grain feeding anti-blocking elevator module is arranged at the lower end of the ventilation corner box module and comprises two sets of symmetrically-arranged grain discharging mechanisms and an elevator. The system integrates multiple functions of drying, lifting, grain discharging, circulating and the like.