Dual-heat-source grain dehumidifying dryer and use method thereof

Abstract

The present application relates to the technical field of grain dehumidification drying, and discloses a double-heat-source grain dehumidification dryer and a use method thereof; the double-heat-source grain dehumidification dryer comprises a bottom plate, a drying tower body is fixedly installed on the top of the bottom plate, a feeding layer is arranged at the top end of the drying tower body, a discharging layer is arranged at the bottom end of the drying tower body, a moisture discharging layer is arranged in the drying tower body, and a treatment bin is arranged on one side of the moisture discharging layer. The present application has the beneficial effects that: through the high integration of two sets of heat sources of a biomass pyrolysis furnace and a low-temperature heat pump, and the recycling and heat exchange of waste heat as an energy-saving heat source, the heat energy of carbonized biomass is fully utilized, the production and income of carbonates are increased, the drying capacity of the drying tower body is increased, and the cost of grain dehumidification drying is reduced; the wet and hot air discharged by the moisture discharging layer can be cooled through the cooling assembly, so that the temperature of the wet and hot air is effectively reduced, and the influence on the environment around the drying tower body is reduced.

Description

Technical Field

[0001] This invention relates to the field of grain dehumidification and drying technology, specifically to a dual-heat-source grain dehumidification and drying machine and its usage method. Background Technology

[0002] Grain refers to wheat, rice, corn, soybeans, miscellaneous grains and their finished products. It is a core basic material for maintaining national livelihood and ensuring national food security. Grains generally contain high moisture content after harvest. If the moisture content is not reduced in time, grains are prone to mold, clumping, insect infestation, sprouting and deterioration during storage and transportation, which seriously affects the storage period and edible quality of grains. Grain dehumidification and drying is a key process in post-harvest grain processing. Through dehumidification and drying, excess moisture inside the grain can be effectively removed, thereby avoiding grain deterioration and loss, and ensuring the stable storage and normal use of large quantities of grain.

[0003] Existing grain dehumidification dryers, taking common traditional energy grain drying towers such as biomass, coal, and natural gas as examples, mainly rely on high-temperature hot air of 130℃ to 160℃ to penetrate the inside of the tower and remove moisture from the grain to complete the drying operation. However, when the high-temperature hot air penetrates the grain, removes moisture, and then mixes with natural cold air, the fluctuating drying temperature will cause uneven moisture content in the grain. This can easily cause changes in the molecular structure of grains such as corn, reduce their bulk density, and result in grain loss. This method of dehumidifying and drying grains using a single heat source has caused considerable losses to the national food security policy and is not conducive to the normal operation of grain dehumidification and drying. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-heat-source grain dehumidification dryer and its usage method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dual heat source grain dehumidification dryer, comprising a base plate, a drying tower body fixedly installed on the top of the base plate, a feeding layer at the top of the drying tower body, a discharge layer at the bottom of the drying tower body, a dehumidification layer inside the drying tower body, a processing chamber on one side of the dehumidification layer, and a cooling component inside the processing chamber for rapidly cooling the hot and humid air to reduce the impact on the surrounding environment of the drying tower body; A biomass pyrolysis furnace is provided on one side of the drying tower. The biomass pyrolysis furnace is fixedly installed on the top of the base plate. A support platform is provided above the biomass pyrolysis furnace. The bottom of the support platform is connected to the base plate. A heat exchanger is fixedly installed on the top of the support platform. Support frames are fixedly connected to both sides of the processing chamber. The bottom end of the support frame is connected to the base plate.

[0006] Preferably, a first preheating layer and a second preheating layer are sequentially arranged below the feeding layer, and the dehumidification layer is located below the second preheating layer. Hot water pipes are provided inside the first preheating layer and the second preheating layer. The hot water pipes are connected in series by pipes. The inlet of the hot water pipe is connected to the outlet of the biomass pyrolysis furnace by a pipe, and the outlet of the hot water pipe is connected to the return water port of the biomass pyrolysis furnace by a pipe.

[0007] Preferably, a first drying heat pump layer, a second drying heat pump layer, a third drying heat pump layer, a fourth drying heat pump layer, and a fifth drying heat pump layer are sequentially provided below the dehumidification layer, and a drying adjustment layer for improving the uniformity of grain heating is provided between the third drying heat pump layer and the fourth drying heat pump layer.

[0008] Preferably, a second cooling layer and a first cooling layer are sequentially arranged above the discharge layer. A fan is fixedly installed on one side of the second cooling layer. The air inlet of the fan is connected to the interior of the second cooling layer. The air outlet of the fan is connected to the air inlet of the heat exchanger through a pipe. A hot air inlet is provided on one side of the dehumidification layer. The air outlet of the heat exchanger is connected to the hot air inlet through a pipe. The flue gas outlet of the biomass pyrolysis furnace is connected to the flue gas inlet of the heat exchanger through a pipe.

[0009] Preferably, the cooling component includes a receiving cavity disposed inside the processing chamber. The receiving cavity is provided with support plates at the top and bottom. The support plates are provided with rising channels to facilitate the circulation of hot and humid air. At least two spiral liquid tubes are provided between the support plates. The spiral liquid tubes are arranged concentrically and nested together from large to small. Multiple heat-conducting plates are symmetrically arranged on the outside of the spiral liquid tubes. The heat-conducting plates are respectively connected to the support plates at both ends. The spiral liquid tubes are fixedly installed inside the heat-conducting plates.

[0010] Preferably, a first connecting pipe is provided at the top of one side of the receiving cavity, and a second connecting pipe is provided at the bottom of one side of the receiving cavity. The spiral liquid pipe is connected to the first connecting pipe and the second connecting pipe respectively, and a lower cover is provided at the opening at the bottom of the processing chamber.

[0011] Preferably, the opening at the top of the processing chamber is provided with an upper cover, the top of the upper cover is connected to an air outlet pipe, one end of the air outlet pipe is provided with an exhaust groove, an exhaust fan is installed inside the exhaust groove, and a protective net is fixedly connected to the opening on one side of the exhaust groove.

[0012] Preferably, the processing chamber has connecting parts at both ends, the bottom of the upper cover, and the top of the lower cover, and the connecting parts are connected by bolts. The bottom of the processing chamber is provided with a moisture inlet pipe, and the bottom of the moisture inlet pipe is provided with a moisture inlet.

[0013] Preferably, a moisture outlet is provided on one side of the moisture-wicking layer, one end of the moisture inlet pipe is connected to the moisture outlet, and a drain port is provided at the bottom of the lower cover, with a solenoid valve installed inside the drain port.

[0014] This invention also provides a method of using a dual-heat-source grain dehumidification dryer, comprising the following steps: S1. Feeding and preheating: The grain to be dried is fed into the drying tower from the feeding layer, and the grain enters the first preheating layer and the second preheating layer in sequence; the biomass pyrolysis furnace is started, and the hot water generated by it circulates in the hot water pipeline to thaw and preheat the grain in the preheating layer. S2. Dehumidification and Hot Air Introduction: The preheated grain enters the dehumidification layer; the flue gas generated by the biomass pyrolysis furnace enters the heat exchanger and exchanges heat with the waste heat air from the cooling layer. The generated hot air is sent into the dehumidification layer through the hot air inlet to perform preliminary dehumidification on the grain; the discharged humid hot air enters the processing chamber through the moisture outlet. S3, Multi-stage heat pump drying: After dehumidification, the grain passes through the first drying heat pump layer, the second drying heat pump layer, the third drying heat pump layer, the drying regulating layer, the fourth drying heat pump layer, and the fifth drying heat pump layer in sequence. The low-temperature heat pump provides hot air below ℃ for deep dehumidification and drying. The drying regulating layer shuffles the grain to ensure that the inner and outer layers are heated evenly. S4. Cooling and Waste Heat Recovery: The dried grain enters the first and second cooling layers to cool down; the fan draws the waste heat air from the second cooling layer and sends it to the heat exchanger to exchange heat with the flue gas from the biomass pyrolysis furnace. The preheated air is returned to the dehumidification layer as a heat source. S5. Humid and hot air cooling treatment: The humid and hot air discharged from the dehumidification layer enters the treatment chamber through the moisture inlet pipe. It exchanges heat with the spiral liquid pipe and heat conduction plate in the cooling component and is cooled. The condensate is discharged from the drain port and the cooled air is discharged through the exhaust fan. S6. Discharge: The dried and cooled grain is discharged from the discharge layer.

[0015] The beneficial effects of this invention are as follows: By highly integrating two heat sources—a biomass pyrolysis furnace and a low-temperature heat pump—and utilizing waste heat recovery and heat exchange as an energy-saving heat source, this invention fully utilizes the thermal energy of carbonized biomass and generates carbonized materials, increasing yield and income. Compared with the existing common method of dehumidifying and drying grain using a single heat source, this invention solves the problem of insufficient capacity of single-heat-source heat pump drying towers in a lower temperature environment. This provides better time savings for national food security from field harvesting, transportation, drying to grain storage, increasing the drying capacity of the drying tower and reducing the cost of grain dehumidification and drying. The cooling component can cool the humid and hot air discharged from the dehumidification layer, thereby effectively reducing the temperature of the humid and hot air, reducing the impact on the surrounding environment of the drying tower, avoiding the generation of large amounts of white fog caused by the humid air from multiple drying towers working, and slowing down the rate of secondary aerosol formation. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a dual-heat-source grain dehumidification dryer.

[0017] Figure 2 This is a detailed structural diagram of the drying tower body of a dual-heat-source grain dehumidification dryer.

[0018] Figure 3 This is a structural diagram of the processing chamber of a dual-heat-source grain dehumidification dryer.

[0019] Figure 4 This is a structural diagram of the cooling component of a dual-heat-source grain dehumidification dryer.

[0020] Figure 5 This is a detailed structural diagram of the spiral liquid pipe of a dual-heat-source grain dehumidification dryer.

[0021] Numbered in the diagram: 1. Base plate; 2. Drying tower body; 3. Feeding layer; 4. First preheating layer; 5. Second preheating layer; 6. Hot water pipeline; 7. Dehumidification layer; 8. First drying heat pump layer; 9. Second drying heat pump layer; 10. Third drying heat pump layer; 11. Drying regulating layer; 12. Fourth drying heat pump layer; 13. Fifth drying heat pump layer; 14. First cooling layer; 15. Second cooling layer; 16. Discharge layer; 17. Fan; 18. Biomass pyrolysis furnace; 19. Support platform; 20. Heat exchanger; 21. Processing chamber ; 22. Support frame; 23. Cooling component; 231. Receiving cavity; 232. Support plate; 233. Heat conduction plate; 234. Rising channel; 235. Spiral liquid pipe; 236. First connecting pipe; 237. Second connecting pipe; 238. Lower cover; 239. Upper cover; 2310. Air outlet pipe; 2311. Exhaust trough; 2312. Exhaust fan; 2313. Protective mesh cover; 24. Moisture inlet pipe; 25. Moisture inlet; 26. Drain outlet; 27. Moisture outlet; 28. Hot air inlet; 29. ​​Connecting part. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0023] Reference Figures 1-5This is the first embodiment of the present invention. This embodiment provides a dual heat source grain dehumidification dryer, including a base plate 1, a drying tower body 2 fixedly installed on the top of the base plate 1, a feeding layer 3 at the top of the drying tower body 2, a discharge layer 16 at the bottom of the drying tower body 2, a dehumidification layer 7 inside the drying tower body 2, a processing chamber 21 on one side of the dehumidification layer 7, and a cooling component 23 inside the processing chamber 21 for rapidly cooling the hot and humid air to reduce the impact on the surrounding environment of the drying tower body 2.

[0024] It should be noted that a certain amount of humid air is generated during the grain dehumidification and drying process. If this humid air is directly discharged into the outside atmosphere, it will affect the surrounding environment of the drying tower 2. Especially in cold environments, the humid air generated by multiple drying towers 2 will condense into extremely conspicuous, long-lasting white feather-like clouds, which may easily arouse the resentment of nearby residents and trigger collective complaints. At the same time, humid air will promote the generation of secondary aerosols, forming a vicious cycle of physical and chemical pollution. In order to prevent the humid air inside the dehumidification layer 7 from being directly discharged into the outside atmosphere, the cooling component 23 can quickly cool the humid air, thereby effectively reducing the temperature of the humid air and reducing the impact on the surrounding environment of the drying tower 2.

[0025] A biomass pyrolysis furnace 18 is provided on one side of the drying tower body 2. The biomass pyrolysis furnace 18 is fixedly installed on the top of the base plate 1. A support platform 19 is provided above the biomass pyrolysis furnace 18. The bottom of the support platform 19 is connected to the base plate 1. A heat exchanger 20 is fixedly installed on the top of the support platform 19. Support frames 22 are fixedly connected to both sides of the processing chamber 21. The bottom end of the support frame 22 is connected to the base plate 1.

[0026] In actual use, the grain to be dried enters the drying tower 2 from the feed layer 3. Then, the biomass pyrolysis furnace 18 is started to provide heat energy for the subsequent thawing and preheating of the grain. The heat generated by the biomass pyrolysis furnace 18 can be converted by the heat exchanger 20, thereby providing a stable heat source for the entire drying process. At the same time, the support platform 19 and the support frame 22 respectively ensure the installation stability of the heat exchanger 20 and the processing chamber 21. It should be noted that the biomass pyrolysis furnace 18 uses biomass such as rice husks, straw, and fruit shells as raw materials. It does not burn completely during operation, but only carbonizes. The biomass carbonized products after pyrolysis can be used for fertilizer and other purposes, which helps to save the cost of grain dehumidification and drying and increase the output of the drying tower 2. Example

[0027] Reference Figures 1-4 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0028] Specifically, a first preheating layer 4 and a second preheating layer 5 are arranged sequentially below the feeding layer 3. A dehumidification layer 7 is located below the second preheating layer 5. Hot water pipes 6 are provided inside the first preheating layer 4 and the second preheating layer 5. The hot water pipes 6 are connected in series by pipes. The inlet of the hot water pipe 6 is connected to the outlet of the biomass pyrolysis furnace 18 by pipes, and the outlet of the hot water pipe 6 is connected to the return water port of the biomass pyrolysis furnace 18 by pipes.

[0029] In practical use, the first preheating layer 4 and the second preheating layer 5 are closed-loop grain drying layers. The hot water generated by the biomass pyrolysis furnace 18 circulates in the series-connected hot water pipes 6. The heat of the hot water is used to thaw and preheat the frozen grain in the first preheating layer 4 and the second preheating layer 5. Compared with the existing common method of dehumidifying and drying grain using a single heat source, this invention solves the problem of insufficient capacity of single heat source heat pump drying towers in low-temperature environments. It saves time more effectively for national food security from field harvesting, transportation, drying to grain storage.

[0030] Specifically, below the dehumidification layer 7, there are sequentially arranged a first drying heat pump layer 8, a second drying heat pump layer 9, a third drying heat pump layer 10, a fourth drying heat pump layer 12, and a fifth drying heat pump layer 13. Between the third drying heat pump layer 10 and the fourth drying heat pump layer 12, there is a drying adjustment layer 11 for improving the uniformity of grain heating.

[0031] In actual use, the grains that have undergone preliminary dehumidification will enter each drying heat pump layer from top to bottom. During this process, the low-temperature heat pump, as the second heat source of this invention, uses a low-temperature mode below 80°C to deeply dehumidify and dry the grains. Then, when the grains flow through the drying regulating layer 11, their stacked state will be disrupted, allowing both the inner and outer layers of grains to fully contact the hot air from the heat pump. This ensures that the moisture distribution of the grains is uniform, eliminating problems such as uneven moisture distribution, grain bursting, and grain scorching caused by traditional high-temperature drying, and protecting the molecular structure of the grains from damage.

[0032] Specifically, a second cooling layer 15 and a first cooling layer 14 are arranged sequentially above the discharge layer 16. A fan 17 is fixedly installed on one side of the second cooling layer 15. The air inlet of the fan 17 is connected to the interior of the second cooling layer 15. The air outlet of the fan 17 is connected to the air inlet of the heat exchanger 20 through a pipe. A hot air inlet 28 is provided on one side of the dehumidification layer 7. The air outlet of the heat exchanger 20 is connected to the hot air inlet 28 through a pipe. The flue gas outlet of the biomass pyrolysis furnace 18 is connected to the flue gas inlet of the heat exchanger 20 through a pipe.

[0033] In actual use, the grain that has completed deep drying will enter the first cooling layer 14 and the second cooling layer 15 for cooling. The waste heat generated during the cooling process is extracted by the fan 17 and sent to the heat exchanger 20. The waste heat will exchange heat with the flue gas of the biomass pyrolysis furnace 18. The hot air formed after the two have completed the heat exchange will be sent to the dehumidification layer 7 through the hot air inlet 28. In this way, the waste heat recovery heat exchange method is used as an energy-saving heat source for the dehumidification layer, which helps to reduce the dehumidification load of the subsequent heat pump layer and further reduces the cost of grain dehumidification and drying. Example

[0034] Reference Figures 2-5 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0035] Specifically, the cooling component 23 includes a receiving cavity 231 disposed inside the processing chamber 21. The top and bottom of the receiving cavity 231 are provided with support plates 232. The inside of the support plates 232 is provided with rising channels 234 to facilitate the circulation of hot and humid air. There are no fewer than two spiral liquid pipes 235 between the support plates 232. The spiral liquid pipes 235 are arranged concentrically and nested together from large to small. Multiple heat-conducting plates 233 are symmetrically arranged on the outside of the spiral liquid pipes 235. The heat-conducting plates 233 are respectively connected to the support plates 232 at both ends. The spiral liquid pipes 235 are fixedly installed inside the heat-conducting plates 233.

[0036] In actual use, the hot and humid air discharged from the dehumidification layer 7 flows upward through the rising channel 234 into the receiving cavity 231. The multi-layered nested spiral liquid pipes 235, combined with the outer heat-conducting plate 233, greatly expand the heat exchange area, which can quickly cool down the hot and humid air flowing through it. This effectively reduces the temperature of the hot and humid air, reduces the impact on the surrounding environment of the drying tower 2, and facilitates the recovery and reuse of residual moisture. At the same time, the upper and lower support plates 232 can fix the spiral liquid pipes 235 and the heat-conducting plate 233 as a whole, thereby preventing the components from shaking due to air flow and ensuring the continuous and stable operation of the hot and humid air cooling operation.

[0037] Specifically, a first connecting pipe 236 is provided at the top of one side of the receiving cavity 231, and a second connecting pipe 237 is provided at the bottom of one side of the receiving cavity 231. The spiral liquid pipe 235 is connected to the first connecting pipe 236 and the second connecting pipe 237 respectively. A lower cover 238 is provided at the opening at the bottom of the processing chamber 21, and an upper cover 239 is provided at the opening at the top of the processing chamber 21. An exhaust pipe 2310 is connected to the top of the upper cover 239. An exhaust groove 2311 is provided at one end of the exhaust pipe 2310. An exhaust fan 2312 is installed inside the exhaust groove 2311, and a protective net cover 2313 is fixedly connected to the opening on one side of the exhaust groove 2311.

[0038] In actual use, the first connecting pipe 236 and the second connecting pipe 237 can be connected to the external domestic water pipe. After heat exchange, the domestic water will flow out from the second connecting pipe 237, thus forming an uninterrupted cooling circulation loop. The cooled and dehumidified air will be discharged outside the device through the exhaust pipe 2310 and the exhaust trough 2311 under the suction of the exhaust fan 2312. The protective net cover 2313 at the exhaust port can block external debris from entering the pipe and prevent the air duct from being blocked.

[0039] Specifically, the two ends of the treatment chamber 21, the bottom of the upper cover 239, and the top of the lower cover 238 are all provided with docking parts 29, which are connected by bolts. The bottom of the inner cavity of the treatment chamber 21 is provided with a moisture inlet pipe 24, and the bottom of the moisture inlet pipe 24 is provided with a moisture inlet 25. The side of the dehumidification layer 7 is provided with a moisture outlet 27, and one end of the moisture inlet pipe 24 is connected to the moisture outlet 27. The bottom of the lower cover 238 is provided with a drain port 26, and a solenoid valve is installed inside the drain port 26.

[0040] In actual use, the moisture generated by the dehumidification layer 7 will be discharged from the moisture outlet 27, and then enter the treatment chamber 21 through the moisture inlet pipe 24 and the moisture inlet 25. The water condensed after the hot and humid air cools will collect at the bottom of the inner cavity of the lower cover 238. The staff can open the drain port 26 by controlling the solenoid valve to discharge the condensate in time. At the same time, the connecting part 29 and the bolts realize the detachable connection between the upper cover 239, the lower cover 238 and the treatment chamber 21, so as to facilitate the staff to clean and maintain the internal components of the treatment chamber 21.

[0041] In use, the drying tower 2 first integrates two heat sources: a biomass pyrolysis furnace 18 and a low-temperature heat pump. Then, it utilizes waste heat recovery and heat exchange as an energy-saving heat source. This fully utilizes the thermal energy of carbonized biomass and generates carbonized products, increasing yield and income. Compared with the existing common method of dehumidifying and drying grains using a single heat source, this invention solves the problem of insufficient capacity of single-heat-source heat pump drying towers in a lower temperature environment. For national food security, it saves time more effectively from field harvesting, transportation, drying to grain storage, increases the drying capacity of the drying tower 2, and reduces the cost of grain dehumidification and drying. At the same time, the cooling component 23 can cool the humid and hot air discharged from the dehumidification layer 7, thereby effectively reducing the temperature of the humid and hot air, reducing the impact on the surrounding environment of the drying tower 2, avoiding the generation of a large amount of white fog caused by the humid air from multiple drying towers 2 working, and slowing down the rate of secondary aerosol generation. Example

[0042] This is the fourth embodiment of the present invention, which is based on the first three embodiments.

[0043] This embodiment also provides a method for using a dual-heat-source grain dehumidification dryer, including the following steps: S1. Feeding and preheating: The grain to be dried is fed into the drying tower 2 from the feeding layer 3. The grain enters the first preheating layer 4 and the second preheating layer 5 in sequence. The biomass pyrolysis furnace 18 is started, and the hot water generated by it circulates in the hot water pipeline 6 to thaw and preheat the grain in the preheating layer. S2. Dehumidification and hot air introduction: The preheated grain enters the dehumidification layer 7; the flue gas generated by the biomass pyrolysis furnace 18 enters the heat exchanger 20 and exchanges heat with the waste heat air from the cooling layer. The generated hot air is sent into the dehumidification layer 7 through the hot air inlet 28 to perform preliminary dehumidification on the grain; the discharged humid hot air enters the processing chamber 21 through the moisture outlet 27. S3, Multi-stage heat pump drying: The dehumidified grain passes through the first drying heat pump layer 8, the second drying heat pump layer 9, the third drying heat pump layer 10, the drying regulating layer 11, the fourth drying heat pump layer 12, and the fifth drying heat pump layer 13 in sequence. The low-temperature heat pump provides hot air below 80°C for deep dehumidification and drying. The drying regulating layer 11 shuffles the grain to ensure that the inner and outer layers are heated evenly. S4. Cooling and waste heat recovery: The dried grain enters the first cooling layer 14 and the second cooling layer 15 to cool down; the fan 17 draws the waste heat air from the second cooling layer 15 and sends it to the heat exchanger 20 to exchange heat with the flue gas of the biomass pyrolysis furnace 18. The preheated air is returned to the dehumidification layer 7 as a heat source. S5. Humid and hot air cooling treatment: The humid and hot air discharged from the dehumidification layer 7 enters the treatment chamber 21 through the moisture inlet pipe 24. It exchanges heat with the spiral liquid pipe 235 and the heat conduction plate 233 in the cooling component 23. The condensate is discharged from the drain port 26. The cooled air is discharged through the exhaust fan 2312. S6. Discharge: The dried and cooled grain is discharged from the discharge layer 16.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-heat-source grain dehumidification dryer, comprising a base plate (1), characterized in that: A drying tower body (2) is fixedly installed on the top of the base plate (1). The top of the drying tower body (2) is provided with a feeding layer (3), and the bottom of the drying tower body (2) is provided with a discharge layer (16). The interior of the drying tower body (2) is provided with a dehumidification layer (7). A processing chamber (21) is provided on one side of the dehumidification layer (7). The interior of the processing chamber (21) is provided with a cooling component (23) for rapidly cooling the hot and humid air to reduce the impact on the surrounding environment of the drying tower body (2). A biomass pyrolysis furnace (18) is provided on one side of the drying tower (2). The biomass pyrolysis furnace (18) is fixedly installed on the top of the base plate (1). A support platform (19) is provided above the biomass pyrolysis furnace (18). The bottom of the support platform (19) is connected to the base plate (1). A heat exchanger (20) is fixedly installed on the top of the support platform (19). Support frames (22) are fixedly connected to both sides of the processing chamber (21). The bottom end of the support frame (22) is connected to the base plate (1).

2. The dual-heat-source grain dehumidification dryer according to claim 1, characterized in that: Below the feeding layer (3), there are a first preheating layer (4) and a second preheating layer (5) in sequence. The dehumidification layer (7) is located below the second preheating layer (5). Hot water pipes (6) are provided inside the first preheating layer (4) and the second preheating layer (5). The hot water pipes (6) are connected in series by pipes. The inlet of the hot water pipe (6) is connected to the outlet of the biomass pyrolysis furnace (18) by pipes. The outlet of the hot water pipe (6) is connected to the return water port of the biomass pyrolysis furnace (18) by pipes.

3. The dual-heat-source grain dehumidification dryer according to claim 1, characterized in that: Below the dehumidification layer (7) are arranged a first drying heat pump layer (8), a second drying heat pump layer (9), a third drying heat pump layer (10), a fourth drying heat pump layer (12), and a fifth drying heat pump layer (13). A drying adjustment layer (11) for improving the uniformity of grain heating is provided between the third drying heat pump layer (10) and the fourth drying heat pump layer (12).

4. The dual-heat-source grain dehumidification dryer according to claim 1, characterized in that: Above the discharge layer (16) are arranged a second cooling layer (15) and a first cooling layer (14) in sequence. A fan (17) is fixedly installed on one side of the second cooling layer (15). The air inlet of the fan (17) is connected to the interior of the second cooling layer (15). The air outlet of the fan (17) is connected to the air inlet of the heat exchanger (20) through a pipe. A hot air inlet (28) is provided on one side of the dehumidification layer (7). The air outlet of the heat exchanger (20) is connected to the hot air inlet (28) through a pipe. The smoke outlet of the biomass pyrolysis furnace (18) is connected to the smoke inlet of the heat exchanger (20) through a pipe.

5. The dual-heat-source grain dehumidification dryer according to claim 1, characterized in that: The cooling component (23) includes a receiving cavity (231) disposed inside the processing chamber (21). The top and bottom of the receiving cavity (231) are provided with support plates (232). The inside of the support plate (232) is provided with a rising channel (234) to facilitate the flow of hot and humid air. There are no fewer than two spiral liquid tubes (235) between the support plates (232). The multiple spiral liquid tubes (235) are arranged concentrically. The spiral liquid tubes (235) are nested and combined with each other from large to small. Multiple heat-conducting plates (233) are symmetrically arranged on the outside of the spiral liquid tubes (235). The heat-conducting plates (233) are respectively connected to the support plates (232) at both ends. The spiral liquid tubes (235) are fixedly installed inside the heat-conducting plates (233).

6. The dual-heat-source grain dehumidification dryer according to claim 5, characterized in that: The top of one side of the receiving cavity (231) is provided with a first connecting pipe (236), and the bottom of one side of the receiving cavity (231) is provided with a second connecting pipe (237). The spiral liquid pipe (235) is connected to the first connecting pipe (236) and the second connecting pipe (237) respectively. The bottom opening of the processing chamber (21) is provided with a lower cover (238).

7. The dual-heat-source grain dehumidification dryer according to claim 6, characterized in that: The processing chamber (21) has an opening at the top with a top cover (239). The top of the top cover (239) is connected to an exhaust pipe (2310). One end of the exhaust pipe (2310) is provided with an exhaust trough (2311). An exhaust fan (2312) is installed inside the exhaust trough (2311). A protective net cover (2313) is fixedly connected to the opening on one side of the exhaust trough (2311).

8. The dual-heat-source grain dehumidification dryer according to claim 7, characterized in that: The processing chamber (21) has connecting parts (29) at both ends, the bottom of the upper cover (239) and the top of the lower cover (238). The connecting parts (29) are connected by bolts. The bottom of the inner cavity of the processing chamber (21) is provided with a moisture inlet pipe (24), and the bottom of the moisture inlet pipe (24) is provided with a moisture inlet (25).

9. The dual-heat-source grain dehumidification dryer according to claim 1 or 8, characterized in that: The moisture-venting layer (7) has a moisture outlet (27) on one side, and one end of the moisture inlet pipe (24) is connected to the moisture outlet (27). The bottom of the lower cover (238) has a drain port (26), and a solenoid valve is installed inside the drain port (26).

10. A method of using the dual-heat-source grain dehumidification dryer according to claims 1-9, characterized in that: Includes the following steps: S1. Feeding and preheating: The grain to be dried is fed into the drying tower body (2) from the feeding layer (3), and the grain enters the first preheating layer (4) and the second preheating layer (5) in sequence; the biomass pyrolysis furnace (18) is started, and the hot water generated by it circulates in the hot water pipeline (6) to thaw and preheat the grain in the preheating layer; S2, Dehumidification and Hot Air Introduction: The preheated grain enters the dehumidification layer (7); the flue gas generated by the biomass pyrolysis furnace (18) enters the heat exchanger (20) and exchanges heat with the residual heat air from the cooling layer. The generated hot air is sent into the dehumidification layer (7) through the hot air inlet (28) to perform preliminary dehumidification on the grain; the discharged humid hot air enters the processing chamber (21) through the moisture outlet (27). S3, Multi-stage heat pump drying: After dehumidification, the grain passes through the first drying heat pump layer (8), the second drying heat pump layer (9), the third drying heat pump layer (10), the drying regulating layer (11), the fourth drying heat pump layer (12), and the fifth drying heat pump layer (13) in sequence. The low-temperature heat pump provides hot air below 80°C for deep dehumidification and drying. The drying regulating layer (11) shuffles the grain to make the inner and outer layers heat evenly. S4, Cooling and Waste Heat Recovery: The dried grain enters the first cooling layer (14) and the second cooling layer (15) to cool down; the fan (17) draws the waste heat air from the second cooling layer (15) and sends it to the heat exchanger (20) to exchange heat with the flue gas of the biomass pyrolysis furnace (18). The preheated air is returned to the dehumidification layer (7) as a heat source. S5. Humid and hot air cooling treatment: The humid and hot air discharged from the dehumidification layer (7) enters the treatment chamber (21) through the moisture inlet pipe (24), and is cooled by heat exchange with the spiral liquid pipe (235) and the heat conduction plate (233) in the cooling component (23). The condensate is discharged from the drain port (26), and the cooled air is discharged through the exhaust fan (2312). S6, Discharge: The dried and cooled grain is discharged from the discharge layer (16).

Images