Tail gas waste heat recycling type grain drying machine

Abstract

The utility model relates to the technical field of grain drying equipment, in particular to a tail gas waste heat recycling type grain dryer which comprises an inner cylinder with the top end closed, a plurality of first air holes are evenly formed in the side wall of the inner cylinder, an outer cylinder is arranged outside the inner cylinder in a sleeving mode, and a plurality of second air holes are evenly formed in the side wall of the outer cylinder. A lower conical hopper is arranged at the bottom of the outer barrel, a spiral lifting mechanism is arranged in the lower conical hopper, the outer barrel is sleeved with a tail gas collecting chamber, the tail gas collecting chamber communicates with the outer barrel through a second air hole, and a plurality of moisture removal holes are evenly formed in the top of the tail gas collecting chamber; the bottom of the outer cylinder is communicated with the output end of a hot air fan; the input end of the hot air fan is communicated with a hot air furnace; the tail gas collecting chamber communicates with the second hot air pipeline. The tail gas recovery device has the advantages that tail gas enters the second hot air pipeline from the air return pipeline and is mixed with hot air generated in the hot air furnace to form tail gas recovery circulation, so that the heat efficiency is improved, and the heat consumption of the drying machine is reduced.

Description

Technical Field

[0001] This utility model relates to the field of grain drying equipment technology, and in particular to a grain dryer with exhaust gas waste heat recovery type. Background Technology

[0002] Grain dryers are a crucial component of grain production and are widely used in my country. Currently, the heat medium in grain dryers is primarily hot air (commonly known as hot air) generated by a hot air furnace. Hot air is forced into the dryer by a fan under positive or negative pressure. Inside the dryer, the hot air exchanges moisture and heat with the grain, reducing its moisture content and achieving drying. As the hot air absorbs moisture, its temperature decreases, and it is discharged as exhaust gas with a certain temperature. This exhaust gas contains water vapor, dust impurities, and heat. Directly releasing the exhaust gas into the atmosphere due to its heat content wastes this heat. However, considering the impact of water vapor and dust impurities in the exhaust gas, the technical difficulty of solving this problem increases, and many current methods have been abandoned due to the high cost of isolating water vapor and dust. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a grain dryer with exhaust gas waste heat recovery type, so as to realize the recovery of waste heat in exhaust gas and reduce the heat consumption of grain dryer.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A waste heat recovery grain dryer includes an inner cylinder with a closed top. Multiple first air holes are evenly distributed on the side wall of the inner cylinder. An outer cylinder is fitted around the inner cylinder, and multiple second air holes are evenly distributed on the side wall of the outer cylinder. The inner wall of the outer cylinder and the outer wall of the inner cylinder are spaced apart to accommodate grain. A lower conical hopper is provided at the bottom of the outer cylinder, and the top of the lower conical hopper communicates with the bottom of the outer cylinder. A spiral lifting mechanism is provided inside the lower conical hopper, and the bottom end of the spiral lifting mechanism is located at the bottom of the lower conical hopper. Inside, the top of the spiral lifting mechanism extends above the outer cylinder to transport the grain in the lower conical hopper upwards and then into the space between the outer cylinder and the inner cylinder; the outer cylinder is fitted with a tail gas collection chamber, which is connected to the outer cylinder through a second air hole, and the top of the tail gas collection chamber is evenly provided with multiple moisture venting holes; the bottom of the outer cylinder is connected to the output end of the hot air blower through a first hot air pipe, and the input end of the hot air blower is connected to the hot air furnace through a second hot air pipe; the tail gas collection chamber is connected to the second hot air pipe through a return air pipe.

[0005] The beneficial effects of this utility model are: by adding a tail gas collection chamber to the outer layer of the outer cylinder, during the grain drying process, part of the tail gas is directly discharged into the air, and the other part of the tail gas enters the tail gas collection chamber. Then, under the negative pressure of the hot air blower, it enters the second hot air pipe from the return air pipe, mixes with the hot air generated in the hot air furnace, and forms a tail gas recovery cycle, thereby improving thermal efficiency and reducing the heat consumption of the dryer.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, an air regulating valve is installed on the return air duct.

[0008] The beneficial effects of adopting the above-mentioned further solution are: the air regulating valve can be adjusted manually or its opening degree can be intelligently controlled by a servo motor transmission mechanism, thereby adjusting the waste heat recovery effect by adjusting the amount of return air.

[0009] Furthermore, the spiral lifting mechanism includes a lifting tube, the bottom end of which is located at the bottom of the inner cavity of the lower conical hopper, and the bottom of the lifting tube is connected to the bottom of the inner cavity of the lower conical hopper. The top end of the lifting tube extends upward to the vertically above the outer cylinder. A spiral auger extending along the length of the lifting tube is provided inside the lifting tube, and a driving mechanism for driving the spiral auger to rotate is provided at the bottom of the lower conical hopper.

[0010] The beneficial effects of adopting the above-mentioned further scheme are as follows: the rotation of the auger drives the grain falling into the lower cone hopper to be transported from the lifting pipe to the top of the outer cylinder and then falls between the outer cylinder and the inner cylinder. Then, as the grain falls from the top of the outer cylinder to the lower cone hopper, it is dried by hot air. Finally, it falls into the lower cone hopper and is then conveyed upward by the auger to achieve cyclic drying. This process is repeated many times until the moisture content of the grain reaches the required level, thus achieving cyclic drying of the grain and improving the drying effect.

[0011] Furthermore, the lifting pipe is vertically arranged, extends from the top of the inner cylinder through the inner cylinder, and the outer wall of the lifting pipe is connected to the top of the inner cylinder.

[0012] The advantages of adopting the above-mentioned further solution are: the lifting pipe is set vertically and connected to the top of the inner cylinder, which facilitates the fixing of the lifting pipe, and after the grain is transported to the top of the outer cylinder, it can fall evenly between the outer cylinder and the inner cylinder, avoiding the accumulation of grain in one place.

[0013] Furthermore, the axis of the lifting pipe coincides with the axis of the inner cylinder, and the top of the inner cylinder is provided with a grain guiding slope.

[0014] The beneficial effects of adopting the above-mentioned further solution are: the setting of the grain guiding slope can prevent the grain from accumulating at the top of the inner cylinder, and the grain guiding slope can evenly distribute the grain falling to the top of the inner cylinder, thereby improving the drying effect.

[0015] Furthermore, a grain-gathering pipe with a closed bottom is fixedly provided at the bottom of the lower conical hopper, the top of the grain-gathering pipe is connected to the bottom of the lower conical hopper, the bottom end of the lifting pipe is fixedly connected to the bottom of the grain-gathering pipe, the driving mechanism is provided on the bottom end of the grain-gathering pipe, and a lifting inlet connected to the grain-gathering pipe is provided on the bottom side wall of the lifting pipe.

[0016] The beneficial effect of adopting the above-mentioned further scheme is that the grain collection pipe can facilitate the collection of grain falling into the lower cone hopper to the lifting inlet, thereby facilitating the upward transport of the grain.

[0017] Furthermore, the top of the lifting pipe is provided with a grain unloading cover, the bottom of the grain unloading cover is open downwards, and the top side of the lifting pipe is provided with several grain unloading ports that communicate with the grain unloading cover.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the grain unloading hood can prevent the grain from falling into the space between the outer and inner cylinders from only one direction after being discharged from the unloading port of the lifting pipe, thus avoiding the accumulation of grain in one place between the outer and inner cylinders, which is not conducive to the drying of the grain.

[0019] Furthermore, an extension tube is detachably fixed to the top of the outer cylinder, and the bottom end of the extension tube is connected to the top end of the outer cylinder.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the detachable heightening cylinder can increase the grain loading volume of the dryer according to actual needs.

[0021] Furthermore, the bottom of the lower cone is uniformly provided with a support frame for supporting the lower cone.

[0022] The advantages of adopting the above-mentioned further solution are: the support frame can support the entire device, while reserving space between the bottom of the lower cone bucket and the ground for installing the drive mechanism.

[0023] Furthermore, the drive mechanism is a geared motor.

[0024] The beneficial effects of adopting the above-mentioned further solution are: the drive mechanism adopts a geared motor, the output shaft of the geared motor is connected to the screw lifting mechanism, and rotating the screw lifting mechanism drives the grain to be lifted. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is the front view of the present invention;

[0027] Figure 3 This is a cross-sectional view of the present invention;

[0028] Figure 4 This is a top view of the present invention;

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Hot air furnace; 2. Second hot air duct; 3. Air regulating valve; 4. Return air duct; 5. Exhaust gas collection chamber; 6. Outer cylinder; 7. Inner cylinder; 8. Screw elevator; 801. Screw auger; 802. Lifting pipe; 9. Grain unloading hood; 10. Dehumidification hole; 11. First hot air duct; 12. Hot air blower; 13. Gear motor; 14. Grain gathering pipe; 15. Lower cone hopper; 16. Elevating cylinder; 17. First air hole; 18. Second air hole; 19. Support frame. Detailed Implementation

[0031] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an embodiment of this utility model includes a top-closed inner cylinder 7. Multiple first air holes 17 are evenly distributed on the side wall of the inner cylinder 7. An outer cylinder 6 is fitted over the inner cylinder 7. Multiple second air holes 18 are evenly distributed on the side wall of the outer cylinder 6. The inner wall of the outer cylinder 6 and the outer wall of the inner cylinder 7 are spaced apart to accommodate grain. A lower conical hopper 15 is provided at the bottom of the outer cylinder 6. The top of the lower conical hopper 15 communicates with the bottom of the outer cylinder 6. A spiral lifting mechanism 8 is provided inside the lower conical hopper 15. The bottom end of the spiral lifting mechanism 8 is located inside the bottom of the lower conical hopper 15, and the top end of the spiral lifting mechanism 8... Extending above the outer cylinder 6, it is used to convey the grain in the lower cone hopper 15 upwards and then fall between the outer cylinder 6 and the inner cylinder 7; the outer cylinder 6 is fitted with a tail gas collection chamber 5, which is connected to the outer cylinder 6 through the second air hole 18, and the top of the tail gas collection chamber 5 is evenly provided with a plurality of moisture exhaust holes 10; the bottom of the outer cylinder 6 is connected to the output end of the hot air blower 12 through the first hot air pipe 11, and the input end of the hot air blower 12 is connected to the hot air furnace 1 through the second hot air pipe 2; the tail gas collection chamber 5 is connected to the second hot air pipe 2 through the return air pipe 4.

[0033] The bottom of the lower cone hopper 15 is provided with multiple support frames 19 or bases, and the entire dryer can be moved. For example, the bottom of the support frame 19 or base is provided with casters, or it can be fixed.

[0034] The first air hole 17 and the second air hole 18 have different diameters depending on the size of the grain particles, so as to facilitate the passage of exhaust gas and prevent the grain from passing through.

[0035] The upper layer of the heightened cylinder 16 is used to increase the grain loading volume of the dryer. Depending on actual needs, the heightened cylinder 16 may or may not have fine holes.

[0036] An air regulating valve 3 is installed on the return air duct 4. The air regulating valve 3 can be adjusted manually or its opening degree can be intelligently controlled by a servo motor transmission mechanism, thereby adjusting the waste heat recovery effect by adjusting the amount of return air.

[0037] In an embodiment of this utility model, the spiral lifting mechanism 8 includes a lifting tube 802. The bottom end of the lifting tube 802 is located at the bottom of the inner cavity of the lower conical hopper 15, and the bottom of the lifting tube 802 is connected to the bottom of the inner cavity of the lower conical hopper 15. The top end of the lifting tube 802 extends upward to the vertically above the outer cylinder 6. A spiral auger 801 extending along the length direction of the lifting tube 802 is provided inside the lifting tube 802. The bottom of the lower conical hopper 15 is provided with a driving mechanism for driving the spiral auger 801 to rotate. The rotation of the auger 801 drives the grain falling into the lower cone hopper 15 to be transported from the lifting pipe 802 to the top of the outer cylinder 6 and then falls between the outer cylinder 6 and the inner cylinder 7. The grain then falls from the top of the outer cylinder 6 into the lower cone hopper 15 and is dried by hot air. Finally, it falls into the lower cone hopper 15 and is then conveyed upward by the auger 801 to achieve cyclic drying. This process is repeated multiple times until the grain moisture content reaches the required level, thus achieving cyclic drying of the grain and improving the drying effect.

[0038] In a preferred embodiment of this invention, the lifting pipe 802 is vertically arranged, passes through the inner cylinder 7 and extends from the top of the inner cylinder 7. The outer wall of the lifting pipe 802 is connected to the top of the inner cylinder 7. Furthermore, the axis of the lifting pipe 802 coincides with the axis of the inner cylinder 7, and the top of the inner cylinder 7 is provided with a grain guiding slope. The vertical arrangement of the lifting pipe 802 and its connection to the top of the inner cylinder 7 facilitates the fixing of the lifting pipe 802. After the grain is transported to the top of the outer cylinder 6, it can fall evenly between the outer cylinder 6 and the inner cylinder 7, avoiding grain accumulation in one place. The grain guiding slope can prevent grain from accumulating on the top of the inner cylinder 7 and can evenly distribute the grain falling to the top of the inner cylinder 7, improving the drying effect. In this embodiment of the invention, the shape of the grain guiding slope can be selected according to the shape of the inner cylinder 7. When the inner cylinder 7 is a square cylinder, the top of the inner cylinder 7 is a four-sided pyramidal structure composed of four triangular faces, where each triangular face constitutes an inclined grain guiding slope. When the inner cylinder 7 is a circular cylinder, the top of the inner cylinder 7 is a conical structure, and its outer surface is an arc-shaped grain guiding slope.

[0039] In this embodiment of the invention, a grain-gathering pipe 14 with a closed bottom is fixedly provided at the bottom of the lower conical hopper 15. The top of the grain-gathering pipe 14 is connected to the bottom of the lower conical hopper 15. The bottom end of the lifting pipe 802 is fixedly connected to the bottom of the grain-gathering pipe 14. The driving mechanism is located at the bottom end of the grain-gathering pipe 14. A lifting inlet communicating with the grain-gathering pipe 14 is provided on the bottom side wall of the lifting pipe 802. The grain-gathering pipe 14 facilitates the collection of grain falling into the lower conical hopper 15 to the lifting inlet, thereby facilitating the upward transport of the grain.

[0040] The bottom end of the rotating shaft of the spiral auger 801 is rotatably connected to the bottom end of the grain gathering tube 14, and the top end is rotatably connected to the grain unloading cover 9. In order to ensure the smooth rotation of the spiral auger 801, the bottom end of the rotating shaft of the spiral auger 801 is preferably rotatably connected to the bottom end of the grain gathering tube 14 through a bearing, and the top end of the rotating shaft of the spiral auger 801 is rotatably connected to the grain unloading cover 9 through a bearing.

[0041] The top of the lifting pipe 802 is provided with a grain unloading cover 9, the bottom of which is open downwards. The top side of the lifting pipe 802 is provided with several grain unloading ports that communicate with the grain unloading cover 9. The grain unloading cover 9 can prevent the grain from falling into the space between the outer cylinder 6 and the inner cylinder 7 from only one direction after being discharged from the grain unloading port of the lifting pipe 802, thus avoiding the accumulation of grain in one place between the outer cylinder 6 and the inner cylinder 7, which is not conducive to the drying of the grain.

[0042] In a preferred embodiment of this utility model, an extension cylinder 16 is detachably fixed to the top of the outer cylinder 6. The bottom end of the extension cylinder 16 is connected to the top end of the outer cylinder 6. The detachable extension cylinder 16 can increase the grain loading volume of the dryer according to actual needs. Specifically, to facilitate the detachable connection between the outer cylinder 6 and the extension cylinder 16, the top of the outer cylinder 6 is provided with an outwardly extending first edge, and the bottom end of the extension cylinder 16 is provided with an outwardly extending second edge. The first edge and the second edge are connected to each other and are detachably fixed by bolts.

[0043] In this embodiment of the utility model, in order to facilitate the mutual fixation between the inner cylinder 7, the outer cylinder 6 and the exhaust gas collection chamber 5, the outer wall of the inner cylinder 7 and the inner wall of the outer cylinder 6 can be fixed together by a connecting frame. The connecting frame needs to be set so as not to obstruct the falling of the grain and to prevent the grain from accumulating between the inner wall of the outer cylinder 6 and the outer wall of the inner cylinder 7. The bottom of the exhaust gas collection chamber 5 and the bottom of the outer cylinder 6 are fixedly connected by a bottom plate covering the bottom of the exhaust gas collection chamber 5, and then supported by a support frame 19.

[0044] An exhaust gas collection chamber 5 is added to the outer layer of the outer cylinder 6. The height of the exhaust gas collection chamber 5 is slightly lower than the height of the outer cylinder 6, and a moisture vent 10 is opened at the top of the exhaust gas collection chamber 5. During the drying process, the hot air generated by the hot air furnace 1 is forced into the inner cylinder 7 through the second hot air duct 2 and the hot air blower 12. Under pressure, the hot air entering the inner cylinder 7 passes through the grain layer and the outer cylinder 6 and then enters the external open space for exhaust. Since the height of the exhaust gas collection chamber 5 is slightly lower than the height of the drying layer, part of the exhaust gas after passing through the grain layer and the outer cylinder 6 is directly discharged, and the other part enters the exhaust gas collection chamber 5. Part of the exhaust gas in the exhaust gas collection chamber 5 enters the recovery pipe, and the other part enters the external space for exhaust through the moisture vent 10 at the top of the exhaust gas collection chamber 5. Part of the exhaust gas entering the recovery pipe is mixed with the hot air in the second hot air duct 2 under the negative pressure of the hot air blower 12 and the adjustment of the air regulating valve 3. The mixed hot air is then forced into the inner cylinder 7 by the hot air blower 12 for grain drying. This process is repeated multiple times, with the exhaust gas continuously mixing with the hot air generated by the hot air furnace 1 before entering the dryer for drying. At the same time, excess exhaust gas is discharged to remove moisture from the grain, ultimately achieving the purpose of drying the grain and thereby improving thermal efficiency and reducing the heat consumption of the dryer.

[0045] Hot air furnace 1 continuously generates hot air and enters the inner cylinder 7. The recovery pipe continuously recovers part of the exhaust gas, and the excess exhaust gas is continuously discharged into the air.

[0046] Drying process of the dryer: The grain inside the dryer is located between the inner cylinder 7 and the outer cylinder 6. After being blown by hot air, it slowly descends and enters the lower conical hopper 15. The grain gathers in the lower conical hopper 15 and then enters the grain collecting pipe 14. The grain collecting pipe 14 is located at the bottom of the spiral lifting mechanism 8. The spiral auger 801 in the spiral lifting mechanism 8 is rotated at high speed by the power of the reduction motor 13. The rotating spiral auger 801 carries the grain in the grain collecting pipe 14 into the lifting pipe 802 and upwards until it reaches the top of the spiral auger 801. The lifting pipe 802 has a discharge port, and the grain enters the discharge hood 9 through the discharge port. Under the protection of the discharge hood 9, the grain falls vertically downwards between the inner cylinder 7 and the outer cylinder 6, completing one drying cycle. Then it enters the next drying cycle, and so on, until the grain moisture content reaches the required level.

[0047] This invention adds a tail gas collection chamber 5 to the outer layer, which is slightly lower than the height of the drying layer. It forms a tail gas circulation system by mixing the tail gas with the hot air generated by the hot air furnace 1 to generate new hot air for drying, thereby improving thermal efficiency and reducing the heat consumption of the dryer. This provides a new idea and model for energy saving and consumption reduction in grain drying.

[0048] In the description of this utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "circumferential", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grain dryer with exhaust gas waste heat recovery type, characterized in that, The system includes an inner cylinder (7) with a closed top, on which a plurality of first air holes (17) are evenly provided on the side wall. An outer cylinder (6) is fitted over the inner cylinder (7), on which a plurality of second air holes (18) are evenly provided on the side wall. The inner wall of the outer cylinder (6) and the outer wall of the inner cylinder (7) are spaced apart to accommodate grain. A lower conical hopper (15) is provided at the bottom of the outer cylinder (6), the top of which is connected to the bottom of the outer cylinder (6). A spiral lifting mechanism (8) is provided inside the lower conical hopper (15), the bottom end of which is located inside the bottom of the lower conical hopper (15), and the top end of which extends to the outer cylinder. The upper part of the 6) is used to transport the grain in the lower cone hopper (15) upward and fall into the space between the outer cylinder (6) and the inner cylinder (7); the outer cylinder (6) is covered with a tail gas collection chamber (5), which is connected to the outer cylinder (6) through the second air hole (18), and the top of the tail gas collection chamber (5) is evenly provided with a plurality of moisture exhaust holes (10); the bottom of the outer cylinder (6) is connected to the output end of the hot air blower (12) through the first hot air pipe (11), and the input end of the hot air blower (12) is connected to the hot air furnace (1) through the second hot air pipe (2); the tail gas collection chamber (5) is connected to the second hot air pipe (2) through the return air pipe (4).

2. The waste heat recovery type grain dryer according to claim 1, characterized in that, The return air duct (4) is equipped with an air regulating valve (3).

3. The waste heat recovery type grain dryer according to claim 1, characterized in that, The spiral lifting mechanism (8) includes a lifting tube (802), the bottom end of which is located at the bottom of the inner cavity of the lower cone bucket (15), and the bottom of the lifting tube (802) is connected to the bottom of the inner cavity of the lower cone bucket (15). The top end of the lifting tube (802) extends upward to the vertical top of the outer cylinder (6). A spiral auger (801) extending along the length of the lifting tube (802) is provided inside the lifting tube (802). A driving mechanism for driving the spiral auger (801) to rotate is provided at the bottom of the lower cone bucket (15).

4. A grain dryer with exhaust gas waste heat recovery type according to claim 3, characterized in that, The lifting pipe (802) is vertically arranged, and the lifting pipe (802) passes through the inner cylinder (7) and extends from the top of the inner cylinder (7). The outer wall of the lifting pipe (802) is connected to the top of the inner cylinder (7).

5. A waste heat recovery grain dryer based on exhaust gas as described in claim 4, characterized in that, The axis of the lifting pipe (802) coincides with the axis of the inner cylinder (7), and the top of the inner cylinder (7) is provided with a grain guiding slope.

6. A waste heat recovery grain dryer based on exhaust gas as described in claim 3, characterized in that, The bottom of the lower cone bucket (15) is fixedly provided with a grain-gathering pipe (14) with the bottom closed. The top of the grain-gathering pipe (14) is connected to the bottom of the lower cone bucket (15). The bottom end of the lifting pipe (802) is fixedly connected to the bottom of the grain-gathering pipe (14). The driving mechanism is located on the bottom end of the grain-gathering pipe (14). The bottom side wall of the lifting pipe (802) is provided with a lifting inlet that is connected to the grain-gathering pipe (14).

7. A grain dryer for waste heat recovery from exhaust gas according to claim 3, characterized in that, The top of the lifting pipe (802) is provided with a grain unloading cover (9), the bottom of the grain unloading cover (9) is open downwards, and the top side of the lifting pipe (802) is provided with several grain unloading ports that communicate with the grain unloading cover (9).

8. A waste heat recovery grain dryer according to any one of claims 1 to 7, characterized in that, The top of the outer cylinder (6) is detachably fixed with a heightening cylinder (16), and the bottom end of the heightening cylinder (16) is connected to the top end of the outer cylinder (6).

9. A waste heat recovery grain dryer according to any one of claims 1 to 7, characterized in that, The bottom of the lower cone (15) is fixedly and evenly provided with a support frame (19) for supporting the lower cone (15).

10. A waste heat recovery grain dryer according to any one of claims 3 to 7, characterized in that, The drive mechanism is a geared motor (13).

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