Grain dryer capable of recycling waste heat

Abstract

The invention is suitable for the technical field of waste heat utilization, and provides a waste heat recycling grain dryer which comprises a dryer body, a material receiving base and a box body fixed to the top of the material receiving base, an air inlet pipe communicated with an inner cavity of the box body is fixed to the bottom of one side of the box body, and an air outlet pipe communicated with the inner cavity of the box body is fixed to the bottom of one side of the box body. A discharging temporary storage box with an upper cover is fixed to the top of the box body, a vibration supporting structure is fixedly installed in the box body, a plurality of drainage plates are fixed to the positions, located above and below the vibration supporting structure, in the box body, a plurality of heat exchange pipe assemblies penetrating through the drainage plates are fixedly installed on the vibration supporting structure, and air guide grooves are formed in the drainage plates. And the mounting through holes are matched with the heat exchange tube assemblies. The technical problem that waste heat of dried hot grain particles is not utilized is solved, the overall energy utilization efficiency is improved, and energy consumption in the grain drying process is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat utilization, and more particularly to a waste heat recycling grain dryer. Background Art

[0002] During the grain drying process, hot air furnaces or air source heat pumps and other equipment will generate a lot of heat to evaporate the moisture in the grain. However, this heat is often dissipated into the atmosphere in the form of exhaust gas and waste heat after drying, resulting in a waste of energy. Effectively utilizing the waste heat generated by the grain dryer can not only improve energy efficiency, but also reduce drying costs and reduce environmental pollution.

[0003] At present, some ways of utilizing waste heat from grain dryers on the market include: flue gas waste heat utilization, exhaust gas waste heat utilization, and air source heat pump waste heat recovery. The recovered flue gas waste heat can be used to preheat the air entering the dryer, increase the temperature of the hot air, thereby speeding up the drying speed and reducing energy consumption; the recovered exhaust gas waste heat can be used to preheat the grain entering the dryer, increase the initial temperature of the grain, and help speed up the drying speed; the recovered waste heat can be used to heat the fresh air entering the dryer, increase the temperature of the hot air, and reduce energy consumption. The above-mentioned waste heat recovery and utilization are relatively complete, but a large part of the waste heat is still not utilized in the grain drying process.

[0004] Different grains have different drying temperatures, and the temperature of the grains when discharged is also different. The appearance of wheat is relatively soft, the pores are relatively large, and the water evaporates easily. During the drying process, the hot air temperature of wheat drying is generally controlled at around 80°C, and the temperature of wheat after drying is between 40-45°C; the embryo of corn is large, contains more starch, and the pericarp structure of the kernel is tight and smooth, which has great resistance to the outward migration of internal moisture. The hot air temperature of corn drying is generally between 100°C and 110°C, and the temperature of corn kernels after drying is around 50°C. However, there is no technical solution in the prior art to reuse the heat contained in the grain particles after drying, resulting in energy waste.

[0005] The grain drying process includes four stages: preheating, water vaporization, slow thawing, and cooling. Among them, the cooling stage is to cool the dried grains to room temperature for easy storage and transportation. Normally, air at room temperature or low temperature is introduced to quickly cool the grains. In this process, cooling not only takes a certain amount of time, but also the waste heat contained in the grains after drying is completely wasted and not reasonably utilized. Therefore, in view of the above technical problems, the present invention proposes a grain dryer for waste heat recycling. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a waste heat recycling grain dryer which can reuse the heat contained in dried grain particles.

[0007] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a waste heat recycling grain dryer, comprising a dryer body, a material receiving base and a box body fixed on the top of the material receiving base, an air inlet pipe connected to the inner cavity of the box body is fixed to the bottom of one side of the box body, an air outlet pipe connected to the inner cavity of the box body is fixed to the bottom of one side of the box body, a material unloading buffer box with an upper cover is fixed to the top of the box body, a vibration support structure is fixedly installed inside the box body, a plurality of guide plates are fixed inside the box body and at positions above and below the vibration support structure, a plurality of heat exchange tube assemblies penetrating the guide plates are fixedly installed on the vibration support structure, and a plurality of the guide plates are provided with air guide grooves and installation through holes matching the heat exchange tube assemblies.

[0008] The heat exchange tube assembly includes an outer heat exchange tube and an inner heat exchange tube coaxially arranged inside the outer heat exchange tube, a material discharge gap is formed between the inner wall of the outer heat exchange tube and the outer wall of the inner heat exchange tube, and telescopic hoses for connecting to the material connecting base and the inner cavity of the material discharge cache box are fixed at both ends of the outer heat exchange tube, and the end of the telescopic hose away from the outer heat exchange tube is fixedly connected to the material connecting base and the material discharge cache box by screws.

[0009] As a preferred technical solution of the present invention, the vibration support structure includes a support plate penetrated by the external heat exchange tube and fixedly connected to the external heat exchange tube, the support plate is fixedly installed inside the box through a mounting rod, two sections of elastic sleeves are sleeved on the mounting rod, a vibration pump is installed at the center of the support plate, and air guide holes are opened on the support plate.

[0010] As a preferred technical solution of the present invention, a fixed frame cooperating with the support plate is fixed inside the box, wherein one end of an elastic sleeve is pressed against the fixed frame and the other end is pressed against the support plate, and one end of another elastic sleeve is pressed against the support plate and the other end is pressed against the adjusting cap of the mounting rod.

[0011] As a preferred technical solution of the present invention, the internal heat exchange tube includes a main hollow tube and a plurality of conical expansion tubes. The plurality of conical expansion tubes are coaxially and equidistantly fixed on the main hollow tube. The conical expansion tube is connected to the inner cavity of the main hollow tube. Both ends of the main hollow tube are respectively pressed against the telescopic hose. The telescopic hose is composed of a bellows and flanges located at both ends of the telescopic bellows. A support frame cooperating with the main hollow tube is fixed in one of the flanges. A flange away from the external heat exchange tube is fixedly connected to the material receiving base and the material unloading buffer box by bolts.

[0012] As a preferred technical solution of the present invention, an exhaust pipe and an air supply pipe connected to the inner cavity of the main hollow tube are fixed at the bottom of the main hollow tube, one end of the air supply pipe located inside the main hollow tube extends to the top of the main hollow tube, and the ends of the exhaust pipe and the air supply pipe located outside the main hollow tube are both equipped with solenoid valves.

[0013] As a preferred technical solution of the present invention, the guide plates are all tilted in one direction, and are fixed inside the box by screws. The inclination angle of the guide plates inside the box is 15°-45°, and the air guide grooves on two adjacent guide plates are staggered, and the mounting through holes on the guide plates cooperate with the external heat exchange tubes.

[0014] As a preferred technical solution of the present invention, the width of the material feeding gap formed between the inner wall of the outer heat exchange tube and the outer wall of the inner heat exchange tube is greater than the particle size of the dried grains by 5-8 mm.

[0015] As a preferred technical solution of the present invention, the guide plates are evenly distributed above and below the support plate.

[0016] As a preferred technical solution of the present invention, a discharge port connected to a telescopic hose is opened at the bottom of the discharge buffer box, a plurality of arc-shaped flow guide covers are fixed at the bottom of the discharge buffer box, and the bottom of the discharge buffer box is fixedly connected to the telescopic hose by bolts.

[0017] As a preferred technical solution of the present invention, the material receiving base includes a storage box connected to a telescopic hose through a top feed port, the top of the storage box is fixedly connected to the telescopic hose by bolts, a spiral discharging fan blade is installed in the storage box, a discharge pipe connected to the inner cavity of the storage box and cooperating with the spiral discharging fan blade is fixed to the bottom of one end of the storage box, and a driving mechanism transmission-connected to the spiral discharging fan blade is installed at the other end of the storage box.

[0018] The advantages of the present invention are: The present invention uses the heat contained in the warm grains after drying in the grain dryer to heat the air in the box through the heat exchange tube assembly. The heated air can be used as waste heat for the grains to be dried or preheat the fresh air entering the dryer, thereby improving the overall energy utilization efficiency and further reducing the energy consumption in the grain drying process. By recovering and utilizing the waste heat of the grain particles after drying, the need for additional heat sources can be reduced, thereby reducing the energy consumption and cost of the drying process.

[0019] The present invention arranges an inner heat exchange tube inside the outer heat exchange tube with its axis to form a feeding gap. The dried hot grains pass through the feeding gap in the form of a thin layer, so that the dried hot grains can fully contact the surfaces of the outer heat exchange tube and the inner heat exchange tube, thereby improving the heat exchange efficiency and further improving the utilization efficiency of the residual heat of the dried hot grains.

[0020] The present invention provides a vibration support structure with a vibration function, which can effectively prevent the grains from being blocked inside the outer heat exchange tube when the dried grains pass through the feeding gap between the outer heat exchange tube and the inner heat exchange tube, thereby ensuring that the dried grains can pass through the outer heat exchange tube smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a structural schematic diagram of a grain dryer for recycling waste heat.

[0022] Figure 2 It is a structural schematic diagram of another viewing angle of the present invention.

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the main view of the present invention.

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the left view of the present invention.

[0025] Figure 5 It is a structural schematic diagram of the coordination between the heat exchange tube assembly and the vibration support structure.

[0026] Figure 6 for Figure 5 Schematic diagram of the structure from another perspective.

[0027] Figure 7 for Figure 5 Schematic diagram of the cross-sectional structure.

[0028] Figure 8 It is a schematic diagram of the structure in which the outer heat exchange tube and the inner heat exchange tube cooperate with each other.

[0029] Fig. 9 It is a schematic diagram of the structure of the internal heat exchange tube.

[0030] Fig.10 It is a schematic diagram of the cross-sectional structure of the internal heat exchange tube.

[0031] Fig.11 It is a structural schematic diagram of the vibration support structure.

[0032] Fig.12 This is a structural schematic diagram of the vibration support structure from another perspective.

[0033] Fig.13 It is a structural schematic diagram of a plurality of guide plates arranged inside a box.

[0034] Fig.14 It is a schematic diagram of the structure in which the material receiving base and the telescopic hose cooperate with each other.

[0035] Fig.15 Schematic diagram of the internal structure of the telescopic hose.

[0036] Fig.16 This is a schematic diagram of the structure of the material unloading buffer box.

[0037] Fig.17 It is a schematic diagram of the cross-sectional structure of the box.

[0038] Fig.18 It is a structural diagram of the dryer body.

[0039] Fig.19 This is the front view of the dryer body.

[0040] In the accompanying drawings: 1, receiving base; 101, storage box; 102, spiral discharge fan blade; 103, discharge pipe; 104, driving mechanism; 2. Box body; 3. Air inlet pipe; 4. Air outlet pipe; 5. Upper cover; 6. Material discharging buffer box; 601. Material discharging port; 602. Arc-shaped air guide cover; 7. Vibration support structure; 701. Support plate; 702. Mounting rod; 703. Elastic sleeve; 704. Vibration pump; 705. Air guide hole; 8. Drainage plate; 801. Air guide groove; 802. Mounting through hole; 9. Heat exchange tube assembly; 901. External heat exchange tube; 902. Internal heat exchange tube; 9021. Main hollow tube; 9022. Conical expansion tube; 9023. Exhaust pipe; 9024. Gas transmission pipe; 903. Telescopic hose; 10. Gas collecting pipe. DETAILED DESCRIPTION

[0041] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0042] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. Embodiment 1:

[0044] See also Figure 1-Figure 19Structural schematic diagram, the present invention provides the following technical solutions: Specifically, it refers to a waste heat recycling grain dryer, including a dryer body, a material receiving base 1 and a box body 2 fixed on the top of the material receiving base 1, an air inlet pipe 3 connected to the inner cavity of the box body 2 is fixed at the bottom of one side of the box body 2, an air outlet pipe 4 connected to the inner cavity of the box body 2 is fixed at the bottom of one side of the box body 2, a material unloading buffer box 6 with an upper cover 5 is fixed on the top of the box body 2, a vibration support structure 7 is fixedly installed inside the box body 2, a plurality of guide plates 8 are fixed inside the box body 2 and at positions above and below the vibration support structure 7, and a plurality of heat exchange tube assemblies 9 penetrating the guide plates 8 are fixedly installed on the vibration support structure 7; Several guide plates 8 are provided with air guide grooves 801 and mounting holes 802 that cooperate with the heat exchange tube assembly 9. Several guide plates 8 are tilted in one direction and fixedly installed inside the box body 2 by screws. The inclination angle of the guide plates 8 inside the box body 2 is 15°-45°. The inclination angle of 15°-45° can ensure that the cold air passing therein has a sufficient residence time in the box body 2, further improving the absorption rate of the residual heat of the hot grains after drying. The air guide grooves 801 provided on two adjacent guide plates are staggered, so that the cold air advances in a Z shape in the box body 2, increasing the contact time of the residual heat with the external heat exchange tube 901, and improving the heat absorption efficiency. The mounting holes 802 provided on the guide plates 8 cooperate with the external heat exchange tube 901, and several guide plates 8 are evenly distributed above and below the support plate 701.

[0045] The heat exchange tube assembly 9 includes an outer heat exchange tube 901 and an inner heat exchange tube 902 coaxially arranged inside the outer heat exchange tube 901. A feeding gap is formed between the inner wall of the outer heat exchange tube 901 and the outer wall of the inner heat exchange tube 902. The width of the feeding gap formed between the inner wall of the outer heat exchange tube 901 and the outer wall of the inner heat exchange tube 902 is larger than the particle size of the dried grains by 5-8 mm. The width of the feeding gap is slightly larger than the particle size of the grain particles, so that the grain particles can pass through the feeding gap. At the same time, the grain particles will not be out of contact with the inner wall of the outer heat exchange tube 901 and the inner heat exchange tube 902 due to the gap being too large. Both ends of the outer heat exchange tube 901 are fixed with telescopic hoses 903 for connecting the material receiving base 1 and the inner cavity of the material receiving buffer box 6. The telescopic hose 903 plays a role of flexible connection and does not hinder the vibration of the outer heat exchange tube 901. The end of the telescopic hose 903 away from the outer heat exchange tube 901 is fixedly connected to the material receiving base 1 and the material receiving buffer box 6 by screws.

[0046] The bottom of the material discharging buffer box 6 is provided with a discharging port 601 connected to the telescopic hose 903, and a plurality of arc-shaped flow guide covers 602 are fixed to the bottom of the material discharging buffer box 6, and the bottom of the material discharging buffer box 6 is fixedly connected to the telescopic hose 903 by bolts. The arc-shaped flow guide covers 602 enable the grains input into the material discharging buffer box 6 to slide to the discharging port 601 under the action of their own gravity, thereby reducing the residue of grains.

[0047] The receiving base 1 includes a storage box 101 connected to the telescopic hose 903 through a top feed port, the top of the storage box 101 is fixedly connected to the telescopic hose 903 by bolts, a spiral discharge fan blade 102 is installed in the storage box 101, a discharge pipe 103 connected to the inner cavity of the storage box 101 and matched with the spiral discharge fan blade 102 is fixed at the bottom of one end of the storage box 101, and a driving mechanism 104 connected to the spiral discharge fan blade 102 is installed at the other end of the storage box 101. The driving mechanism 104 is composed of a reducer and a motor. The power output by the motor drives the spiral discharge fan blade 102 to rotate in the storage box 101 after passing through the reducer, and the cooled grain particles are transported out of the storage box 101, thereby improving the discharge efficiency.

[0048] The working principle of the waste heat recycling grain dryer provided by the present invention is as follows: Working principle: Fresh air is input into the box 2 through the air inlet pipe 3, and the hot grain particles dried in the grain dryer are output through the bottom outlet (such as Fig.19 As shown), the grains are then input into the material discharging buffer box 6 under the action of the lifting bucket, and enter into the external heat exchange tube 901 through the material discharging port 601 and the telescopic hose 903 at the bottom of the material discharging buffer box 6. The dried hot grain particles pass through the material discharging gap. At this time, the dried hot grain particles are in contact with the inner wall of the external heat exchange tube 901, and the dried hot grain particles exchange heat with the air entering the interior of the box body 2 through the external heat exchange tube 901. As the air flows from bottom to top inside the box body 2, the air is gradually heated to a temperature close to that of the hot grain particles (and the temperature of the grain particles passing through the external heat exchange tube 901 drops to a temperature close to that of the incoming air), and the grain particles passing through the external heat exchange tube 901 enter into the storage box 101 through the telescopic hose 903 below, and are temporarily stored in the storage box 101. When needed, the driving mechanism 104 drives the spiral discharging fan blades 102 to output the cooled grain particles. Embodiment 2:

[0049] Based on the specific embodiment 1, the difference of this embodiment is that: like Figure 5 , Fig.11 , Fig.12 As shown, the vibration support structure 7 includes a support plate 701 penetrated by the external heat exchange tube 901 and fixedly connected to the external heat exchange tube 901, the support plate 701 is fixedly installed inside the box body 2 through a mounting rod 702 (the mounting rod 702 penetrates the support plate 701 and is in sliding contact with the support plate 701, and under the constraint of the mounting rod 702, the support plate 701 can only move up and down), two sections of elastic sleeves 703 are sleeved on the mounting rod 702, a vibration pump 704 is installed at the center of the support plate 701, and an air guide hole 705 is opened on the support plate 701.

[0050] A fixed frame matched with the support plate 701 is fixed inside the box 2, one end of an elastic sleeve 703 is pressed against the fixed frame and the other end is pressed against the support plate 701, and one end of another elastic sleeve 703 is pressed against the support plate 701 and the other end is pressed against the adjustment cap of the mounting rod 702. The setting of the two sections of elastic sleeves 703 can play a role in shock absorption and noise reduction.

[0051] Start the vibration pump 704, and the support plate 701 vibrates up and down under the constraint of the mounting rod 702, thereby driving the heat exchange tube assembly 9 mounted thereon to vibrate up and down, so that the grain particles can smoothly pass through the feeding gap between the outer heat exchange tube 901 and the inner heat exchange tube 902, avoiding grain blockage in the outer heat exchange tube 901. Embodiment three:

[0052] Based on the second specific embodiment, the difference of this embodiment is that: like Figure 7-Figure 10 As shown, the inner heat exchange tube 902 includes a main hollow tube 9021 and a plurality of tapered expansion tubes 9022. The plurality of tapered expansion tubes 9022 are fixed on the main hollow tube 9021 at equal distances and coaxially. The tapered expansion tubes 9022 are connected to the inner cavity of the main hollow tube 9021. The two ends of the main hollow tube 9021 are respectively pressed against the telescopic hose 903. The telescopic hose 903 is composed of a bellows and flanges located at both ends of the telescopic bellows. A support frame matching the main hollow tube 9021 is fixed in one of the flanges. A flange away from the outer heat exchange tube 901 is fixedly connected to the material receiving base 1 and the material discharging buffer box 6 by bolts. The tapered expansion tube 9022 structure in the inner heat exchange tube 902 increases the heat exchange area. In addition, the material discharging gap formed by the outer heat exchange tube 901 and the inner heat exchange tube 902 allows the dried hot grain to pass only in a single layer or with a thinner thickness. The synergistic effect of the two further improves the waste heat recovery efficiency.

[0053] An exhaust pipe 9023 and an air supply pipe 9024 are fixed to the bottom of the main hollow pipe 9021. The end of the air supply pipe 9024 located inside the main hollow pipe 9021 extends to the top of the main hollow pipe 9021 (the temperature of the inhaled fresh air is low, and the hot air can be gradually squeezed downward from the top of the main hollow pipe 9021, which helps to discharge the hot air). The ends of the exhaust pipe 9023 and the air supply pipe 9024 located outside the main hollow pipe 9021 are both equipped with solenoid valves. The air supply pipe 9024 can When the solenoid valve at the air inlet end is opened, the outside air is sucked into the cavity formed by the main hollow tube 9021 and the tapered expansion tube 9022, and several exhaust pipes 9023 are connected in sequence and finally pass through the material receiving base 1. One end of the exhaust pipe 9023 located outside the material receiving base 1 is connected to the same air collecting pipe 10. The air collecting pipe 10 inputs the heated hot air into the drying furnace or preheats the fresh air entering the dryer. In conjunction with the external heat exchange tube 901, heat exchange can be performed in both directions at the same time, thereby further utilizing the heat of the hot grain particles after drying.

[0054] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A waste heat recycling grain dryer, comprising a dryer body, a material receiving base (1) and a box (2) fixed on the top of the material receiving base (1), an air inlet pipe (3) connected to the inner cavity of the box (2) fixed to the bottom of one side of the box (2), and an air outlet pipe (4) connected to the inner cavity of the box (2) fixed to the bottom of one side of the box (2), characterized in that: A material unloading buffer box (6) with an upper cover (5) is fixed on the top of the box body (2); a vibration support structure (7) is fixedly installed inside the box body (2); a plurality of guide plates (8) are fixed inside the box body (2) and at positions above and below the vibration support structure (7); and a plurality of heat exchange tube assemblies (9) that penetrate the guide plates (8) are fixedly installed on the vibration support structure (7); A plurality of the guide plates (8) are provided with air guide grooves (801) and mounting through holes (802) that cooperate with the heat exchange tube assembly (9); The heat exchange tube assembly (9) comprises an outer heat exchange tube (901) and an inner heat exchange tube (902) coaxially arranged inside the outer heat exchange tube (901); a material discharge gap is formed between the inner wall of the outer heat exchange tube (901) and the outer wall of the inner heat exchange tube (902); telescopic hoses (903) for connecting to the inner cavity of the material receiving base (1) and the material discharge buffer box (6) are fixed at both ends of the outer heat exchange tube (901); the end of the telescopic hose (903) away from the outer heat exchange tube (901) is fixedly connected to the material receiving base (1) and the material discharge buffer box (6) by means of screws.

2. The waste heat recycling grain dryer according to claim 1, characterized in that: The vibration support structure (7) comprises a support plate (701) penetrated by an external heat exchange tube (901) and fixedly connected to the external heat exchange tube (901); the support plate (701) is fixedly mounted inside the box body (2) via a mounting rod (702); two sections of elastic sleeves (703) are sleeved on the mounting rod (702); a vibration pump (704) is mounted at the center of the support plate (701); and an air guide hole (705) is provided on the support plate (701).

3. The waste heat recycling grain dryer according to claim 2, characterized in that: A fixed frame cooperating with the support plate (701) is fixed inside the box body (2), wherein one end of an elastic sleeve (703) is pressed against the fixed frame and the other end is pressed against the support plate (701), and another end of an elastic sleeve (703) is pressed against the support plate (701) and the other end is pressed against the adjustment cap of the mounting rod (702).

4. The waste heat recycling grain dryer according to claim 1, characterized in that: The inner heat exchange tube (902) comprises a main hollow tube (9021) and a plurality of tapered expansion tubes (9022); the plurality of tapered expansion tubes (9022) are coaxially and equidistantly fixed on the main hollow tube (9021); the tapered expansion tubes (9022) are connected to the inner cavity of the main hollow tube (9021); and both ends of the main hollow tube (9021) are respectively pressed against the telescopic hose (903); The telescopic hose (903) is composed of a bellows and flanges located at both ends of the telescopic bellows, wherein a support frame that cooperates with the main hollow tube (9021) is fixed inside one of the flanges, and a flange away from the external heat exchange tube (901) is fixedly connected to the material receiving base (1) and the material discharge buffer box (6) by bolts.

5. The waste heat recycling grain dryer according to claim 4, characterized in that: An exhaust pipe (9023) and an air supply pipe (9024) which are in communication with the inner cavity of the main hollow pipe (9021) are fixed at the bottom of the main hollow pipe (9021); one end of the air supply pipe (9024) located inside the main hollow pipe (9021) extends to the top of the main hollow pipe (9021); and one end of the exhaust pipe (9023) and the air supply pipe (9024) located outside the main hollow pipe (9021) are both equipped with solenoid valves.

6. The waste heat recycling grain dryer according to claim 1, characterized in that: The plurality of guide plates (8) are all arranged to be inclined in one direction, the guide plates (8) are fixedly mounted inside the box body (2) by means of screws, the guide plates (8) are arranged to be inclined at an angle of 15° to 45° inside the box body (2), the air guide grooves (801) provided on two adjacent guide plates are arranged to be staggered, and the mounting through holes (802) provided on the guide plates (8) cooperate with the external heat exchange tubes (901).

7. The waste heat recycling grain dryer according to claim 1, characterized in that: The width of the material feeding gap formed between the inner wall of the outer heat exchange tube (901) and the outer wall of the inner heat exchange tube (902) is greater than the particle size of the dried grains by 5-8 mm.

8. The waste heat recycling grain dryer according to claim 1, characterized in that: A plurality of guide plates (8) are evenly distributed above and below the support plate (701).

9. The waste heat recycling grain dryer according to claim 1, characterized in that: The bottom of the material unloading buffer box (6) is provided with a material unloading port (601) connected to the telescopic hose (903), a plurality of arc-shaped flow guide covers (602) are fixed to the bottom of the material unloading buffer box (6), and the bottom of the material unloading buffer box (6) is fixedly connected to the telescopic hose (903) by bolts.

10. The waste heat recycling grain dryer according to claim 1, characterized in that: The material receiving base (1) comprises a storage box (101) connected to a telescopic hose (903) via a top material feed port, the top of the storage box (101) being fixedly connected to the telescopic hose (903) via bolts, a spiral discharge fan blade (102) being installed in the storage box (101), a discharge pipe (103) connected to the inner cavity of the storage box (101) and cooperating with the spiral discharge fan blade (102) being fixed at the bottom of one end of the storage box (101), and a driving mechanism (104) being transmission-connected to the spiral discharge fan blade (102) being installed at the other end of the storage box (101).

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