Drying apparatus

Abstract

This invention relates to the field of grain drying technology, and discloses a drying device including a drying tower, multiple hot air pumps spaced horizontally, and a heat exchange device. The drying tower is divided vertically into multiple drying zones with gradually decreasing temperatures, and these zones are interconnected. Each hot air pump is connected to a first air pipe, and the outlets of the multiple first air pipes are vertically connected to the multiple drying zones. The heat exchange device includes a heat exchange chamber containing multiple heat exchange tubes. Multiple second air pipes are connected to the heat exchange chamber, and the outlets of the multiple second air pipes are correspondingly connected to the multiple hot air pumps. At least one first air pipe is connected to a return air pipe, the other end of which is connected to the air inlet of the heat exchange chamber to return a portion of the high-temperature air from the first air pipe to the heat exchange chamber. This prevents the condensate inside the heat exchange tubes from freezing.

Description

Technical Field

[0001] This invention relates to the field of grain drying technology, and more specifically to a drying device. Background Technology

[0002] Drying technology is a crucial step in grain processing. Its main principle involves heating air and then bringing it into contact with wet grains. Heat is transferred to the grains through heat conduction, causing the moisture to evaporate. In existing drying technologies, wet grains are typically placed inside a drying tower, where they exchange heat with cold outside air using a heat exchanger. The resulting hot air is then transported into the drying tower to dry the grains.

[0003] However, existing drying technologies have some limitations. Especially when the outside temperature is too low, the moisture formed inside the heat exchanger during direct heat exchange with the cold air cannot be discharged in time, easily leading to freezing problems. Furthermore, if the grain inside the drying tower is not replenished in a timely manner, the temperature inside the tower can rise sharply, causing damage to the drying tower. These problems limit drying efficiency and also increase equipment maintenance and operating costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem of freezing inside the tubes in the prior art.

[0005] To achieve the above objectives, the present invention provides a drying apparatus comprising:

[0006] Drying tower; The drying tower is divided into multiple drying zones with gradually decreasing temperatures along the vertical direction, and the drying zones are interconnected.

[0007] Multiple hot air pumps are distributed horizontally at intervals. Each hot air pump is connected to a first air pipe. The air outlets of the multiple first air pipes are connected vertically to multiple drying zones.

[0008] The heat exchange device includes a heat exchange chamber, which is equipped with multiple heat exchange tubes. Multiple second air pipes are connected to the heat exchange chamber, and the outlets of the multiple second air pipes are connected to multiple heat pumps.

[0009] At least one of the first air pipes is connected to a return air pipe, the other end of which is connected to the air inlet of the heat exchange chamber, so that the high-temperature air inside the first air pipe can be returned to the heat exchange chamber.

[0010] Optionally, two sets of heat exchange tubes are spaced apart in the heat exchange chamber along the first direction, and multiple heat exchange tubes are spaced apart in each set of heat exchange tubes along the second direction. The heat exchange device also includes an air supply network group, a water collection tank, and a first drainage network group.

[0011] The gas supply network is used to supply steam to the two sets of heat exchange tubes. Each set of heat exchange tubes is connected to a first drainage network to drain the condensate in the heat exchange tubes into a water collection tank. A second drainage network is also connected to the water collection tank to drain the water in the water collection tank into the external pipe network.

[0012] Optionally, the gas supply network includes a gas storage tank, a third gas pipe, and at least one fourth gas pipe. The third gas pipe is connected to the gas inlet on the gas storage tank, and the fourth gas pipe is connected to the gas outlet on the gas storage tank. The third gas pipe is used to transport steam into the gas storage tank, and the fourth gas pipe is used to transport the steam in the gas storage tank into two sets of heat exchange tubes. An electric regulating valve (310) is installed on the fourth gas pipe to regulate the steam flow rate in the fourth gas pipe.

[0013] Optionally, the fourth trachea is connected to the first bronchus and the second bronchus, and the first bronchus and the second bronchus are each connected to a plurality of third bronchus. The third trachea are used to connect the first bronchus to a set of heat exchange tubes and to connect the second bronchus to another set of heat exchange tubes.

[0014] Optionally, the first drainage network group includes a first drainage pipe, a second drainage pipe and multiple branch pipes, and each heat exchange tube group is equipped with a water collection tube.

[0015] One end of each of the multiple branch water pipes is connected to a multiple heat exchange tube, and the other end of each branch water pipe is connected to the first drain pipe. The outlet of the first drain pipe is connected to the inlet of the water collection tube, and both ends of the second drain pipe are connected to the outlet of the water collection tube and the inlet of the water collection tank.

[0016] Optionally, the second drainage network includes at least one water pump, a first water pump pipe, and a second water pump pipe. The two ends of the first water pump pipe are connected to the inlet of the water pump and the outlet of the water collection tank, respectively. The second water pump pipe is connected to the outlet of the water pump to discharge condensate into the external pipe network.

[0017] Optionally, a liquid level monitoring component is installed on the water collection tank to monitor the water level in the tank and control the start of the water pump.

[0018] Optionally, the drying equipment also includes a grain storage silo and a grain conveying mechanism. The grain conveying mechanism includes a first scraper conveyor and a first elevator. The two ends of the first scraper conveyor are located between the discharge port of the grain storage silo and the first elevator. The first elevator is used to convey the grain to the top inlet of the drying tower.

[0019] Optionally, a cooling zone is provided above the grain outlet at the bottom of the drying tower, and a cold air pump is connected to the outside of the drying tower to supply air to the cooling zone.

[0020] Optionally, a cooling pipe is connected between the cooling pump and the drying tower.

[0021] Through the above technical solution, when the heated air in the multiple hot air extraction heat exchange devices of the present invention is input into the drying tower through the first air pipe, at least one return air pipe connected to the first air pipe extracts a portion of the gas and returns it to the air inlet of the heat exchange device to increase the temperature there. Therefore, the freezing of condensate in the heat exchange tubes is avoided, and the working efficiency of the heat exchange device is improved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external outline structure of the drying equipment;

[0023] Figure 2 This is a structural diagram of the drying equipment;

[0024] Figure 3 This is a schematic diagram of the heat exchanger tube structure;

[0025] Figure 4 This is a schematic diagram of the internal structure of the heat exchange cavity;

[0026] Figure 5 This is a schematic diagram of the air storage pump;

[0027] Figure 6 This is a schematic diagram of the backflush assembly;

[0028] Figure 7 This is a schematic diagram of the air intake circuit of the heat exchanger.

[0029] Figure 8 This is a schematic diagram of the water collection tank structure and the second drainage network structure;

[0030] Figure 9 This is a schematic diagram of the heat exchange device;

[0031] Figure 10 This is a schematic diagram of the ventilation holes in the drying tower.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Drying tower; 101. Ventilation vent; 2. Heat pump; 201. First gas pipe; 202. Return gas pipe; 3. Heat exchanger; 301. Heat exchange chamber; 302. Heat exchange tubes; 303. Second gas pipe; 304. Gas supply network; 3041. Gas storage tank; 3042. Third gas pipe; 3043. Fourth gas pipe; 3044. First branch gas pipe; 3045. Second branch gas pipe; 3046. Third... 3047. Bronchus pipe; 3048. Steam thermometer; 3049. Pressure sensor; 3040. First steam valve; 305. First drainage network assembly; 3051. First drainage pipe; 3052. Second drainage pipe; 3053. Branch pipe; 3054. Steam trap; 306. Second drainage network assembly; 3061. Water pump; 3062. First pumping pipe; 3063. Second pumping pipe; 3064. First... 3065. Drain valve; 3066. Second drain valve; 3067. Water pressure gauge; 3068. Third drain pipe; 307. Water collection tube; 308. Pump start / stop electrical control assembly; 309. Water collection tank; 3091. Air vent valve; 3092. Water inlet pipe; 310. Electric regulating valve; 311. Electric air valve; 312. Second steam valve; 313. First drain valve; 314. Second drain valve; 4. Grain storage bin; 5. Grain conveying mechanism; 501. First scraper conveyor; 502. First elevator; 503. Second elevator; 505. First conveyor; 506. Second conveyor; 507. Third elevator; 508. Fourth elevator; 509. Second scraper conveyor; 510. Third scraper conveyor; 6. Cold air pump; 601. Cold air pipe; 7. Grain conveyor; 8. Compressed air compressor; 801. Compressed air pipeline. Detailed Implementation

[0034] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0035] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0036] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] Furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible range of error. "Parallel" is not strictly parallel, but within the permissible range of error. Terms such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0038] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0041] refer to Figure 1 and Figure 2 It is understood that the drying equipment of the present invention includes:

[0042] Drying tower 1 is divided into drying zones with gradually decreasing temperatures along a vertically downward direction, and the drying zones are interconnected.

[0043] Multiple hot air pumps 2 are distributed at intervals along the horizontal direction. Each hot air pump 2 is connected to a first air pipe 201. The air outlets of the multiple first air pipes 201 are connected to multiple drying areas.

[0044] The heat exchange device 3 includes a heat exchange chamber 301, a plurality of heat exchange tubes 302 are provided in the heat exchange chamber 301, a plurality of second air pipes 303 are connected to the heat exchange chamber 301, and the air outlets of the plurality of second air pipes 303 are correspondingly connected to a plurality of hot air pumps 2.

[0045] At least one of the first air pipes 201 is connected to a return air pipe 202, and the other end of the return air pipe 202 is connected to the air inlet of the heat exchange chamber 301 so that the partially heated air inside the first air pipe 201 flows back into the heat exchange chamber 301.

[0046] Meanwhile, the first air pipe 201 is connected to the air outlet of the heat pump 2, and the second air pipe 303 is connected to the air inlet of the heat pump 2.

[0047] In addition, multiple air pumps draw in heated air from the heat exchanger 3 through the second air pipe 303. At this time, a pressure difference is formed inside the heat exchanger 3, thereby drawing in cold air from the outside and bringing it into the interior of the heat exchanger 3. Therefore, the heat exchange tubes 302 at the air inlet of the heat exchanger 3 receive the most intense scouring from the cold air.

[0048] Understandably, as the hot air flows into the drying tower 1 through the first air pipe 201 driven by the hot air pump 2, some of the hot air will flow into the return pipe connected to the first air pipe 201 and flow through the return pipe to the inlet of the heat exchange device 3 to heat the inlet, thereby increasing the ambient temperature and preventing the condensate in the heat exchange tubes 302 at the air inlet from freezing.

[0049] Therefore, when the heated air in the multiple hot air extraction heat exchange devices 3 of this invention is input into the drying tower 1 through the first air pipe 201, at least one return air pipe 202 connected to the first air pipe 201 extracts a portion of the gas and returns it to the air inlet of the heat exchange device 3 to increase the temperature there. This prevents the condensate in the heat exchange tubes 302 from freezing and improves the working efficiency of the heat exchange device 3.

[0050] In some embodiments, reference Figure 4 It is known that each first air pipe 201 and the return pipe connected to it are equipped with an electrically controlled air valve 311.

[0051] Among them, the electrically controlled air valve 311 on the first air pipe 201 is used to adjust the steam flow rate in the first air pipe 201; the electrically controlled air valve 311 on the return pipe is used to adjust the steam flow rate returning to the heat exchange device 3 in the first air pipe 201.

[0052] In some embodiments, the heat pump 2 is provided with two air inlets, one of which is connected to the second air pipe 303, and the other is used to draw in cold air from the outside, so that the air temperature output by the multiple heat pumps 2 can correspond to the temperature of the multiple drying zones in the drying tower 1.

[0053] In some embodiments, the drying tower 1 may include a continuously flowing co-current drying tower 1. Within the drying tower 1, grains flow downwards due to their own gravity, and the hot air flows in the same direction as the grains, a process known as co-current drying. Conversely, when the hot air flows in the opposite direction to the grains, it is called counter-current drying. The co-current and counter-current drying tower 1 includes both co-current and counter-current drying modes.

[0054] Among them, co-current drying can use higher hot air temperatures, resulting in very high thermal efficiency, and the exhaust gas is almost saturated; counter-current drying can continuously and efficiently reduce moisture.

[0055] Additionally, refer to Figure 10 It can be seen that multiple semi-angular ventilation holes 101 are evenly distributed on the entire side wall of the drying tower 1.

[0056] Understandably, steam inside drying tower 1 flows out of the drying tower 1 through multiple semi-angular ventilation holes 101 evenly distributed throughout the side wall under the action of pressure difference, thereby indirectly driving the steam to be evenly distributed within the drying tower 1. This makes the grains heat more evenly during the drying process, avoiding local overheating or incomplete drying.

[0057] In some embodiments, reference Figure 7 As shown, two sets of heat exchange tubes 302 are arranged at intervals along the first direction in the heat exchange chamber 301, and multiple heat exchange tubes 302 are arranged at intervals along the second direction in each set of heat exchange tubes 302. The heat exchange device 3 also includes an air supply network group 304, a water collection tank 309, and a first drainage network group 305.

[0058] The gas supply network group 304 is used to supply steam to the two sets of heat exchange tubes 302. Each set of heat exchange tubes 302 is connected to a first drainage network group 305 to drain the condensate in the heat exchange tubes 302 into the water collection tank 309. A second drainage network group 306 is also connected to the water collection tank 309. The second drainage network is used to drain the water in the water collection tank 309 into the external pipe network.

[0059] In some embodiments, the gas supply network group 304 includes a gas storage tank 3041, a third gas pipe 3042, and at least one fourth gas pipe 3043. The third gas pipe 3042 is connected to the air inlet on the gas storage tank 3041, and the fourth gas pipe 3043 is connected to the air outlet on the gas storage tank 3041. The third gas pipe 3042 is used to transport steam into the gas storage tank 3041, and the fourth gas pipe 3043 is used to transport the steam in the gas storage tank 3041 into two sets of heat exchange tubes 302. An electric regulating valve 310 is provided on the fourth gas pipe 3043 to regulate the steam flow rate in the fourth gas pipe 3043.

[0060] Among them, reference Figure 5 It is known that the gas storage tank 3041 is equipped with multiple first steam valves 3049. The third gas pipe 3042 and the fourth gas pipe 3043 are both connected to the gas storage tank 3041 through the first steam valves 3049, which are used to regulate the opening and closing of the third gas pipe 3042 and the fourth gas pipe 3043. The gas flow rate in the pipe can be adjusted by controlling the flow area in the pipe. Each fourth gas pipe 3043 is equipped with a flow meter to measure the steam flow rate in the fourth gas pipe 3043.

[0061] In addition, a temperature measuring device is installed at the outlet of the heat exchanger 3. The electric regulating valve 310 can adjust the steam flow rate in the fourth air pipe 3043 according to the temperature measured by the temperature measuring device to ensure that the temperature of the hot air output by the heat exchanger 3 meets the requirements. It is worth noting that the temperature of the hot air output by the heat exchanger 3 is not lower than the highest drying temperature in the drying tower 1.

[0062] In this invention, the hot air in a drying tower 1 can be provided by a heat exchange device 3, and multiple heat exchange devices 3 can all be provided with steam by a gas storage tank 3041.

[0063] In some embodiments, the gas storage tank 3041 may also be equipped with a steam thermometer 3047 and a pressure sensor 3048, which are used to measure the temperature and pressure inside the gas storage tank 3041, respectively, to ensure the safe operation and effective management of the gas storage tank 3041.

[0064] The bottom of the gas storage tank 3041 is connected to an exhaust pipe assembly, the outlet of which is connected to the ground to discharge the steam in the gas storage tank 3041 into the ground, thereby avoiding environmental pollution.

[0065] In some embodiments, a first bronchus 3044 and a second bronchus 3045 are connected to the fourth bronchus 3043. A plurality of third bronchus 3046 are connected to both the first bronchus 3044 and the second bronchus 3045. The third bronchus 3042 is used to connect the first bronchus 3044 to a set of heat exchange tubes 302 and to connect the second bronchus 3045 to another set of heat exchange tubes 302.

[0066] Each of the third gas pipes 3042 is equipped with a second steam valve 312 for controlling its opening and closing.

[0067] In this invention, reference Figure 5 and Figure 7 It can be seen that external steam enters the gas storage tank 3041 through the third gas pipe 3042, and then distributes the steam to multiple heat exchange devices 3 through the gas storage tank 3041.

[0068] The gas distribution process for heat exchanger 3 is as follows:

[0069] Steam in the storage tank 3041 flows through the fourth gas pipe 3043 to the first branch pipe 3044 and the second branch pipe 3045. At this time, the opening degree of the second steam valve 312 of each third branch pipe 3046 can be controlled to be the same so that the steam is evenly distributed to each heat exchange tube 302.

[0070] In some embodiments, reference Figure 3 It can be seen that the first drainage network group 305 includes a first drainage pipe 3051, a second drainage pipe 3052 and multiple branch water pipes 3053, and each heat exchange tube group 302 is equipped with a water collection tube 307.

[0071] One end of each of the multiple branch water pipes 3053 is connected to one of the multiple heat exchange tubes 302, and the other end is connected to the first drain pipe 3051. The outlet of the first drain pipe 3051 is connected to the inlet of the water collection tube 307. The two ends of the second drain pipe 3052 are connected to the outlet of the water collection tube 307 and the inlet of the water collection tank 309, respectively.

[0072] The first drainage network group 305 also includes a drain valve 3054 installed on the first drainage pipe 3051 to control the on / off state of the first drainage pipe 3051, and another drainage pipe is connected to the side of the drain valve 3054 to enhance the drainage rate.

[0073] The first drain pipe 3051 is equipped with a first drain valve 313 and a second drain valve 314 at both ends. When steam is initially introduced into the heat exchange tube 302, the first drain valve 313 and the second drain valve 314 are opened to discharge the air in the heat exchange tube 302 at both ends of the steam trap 3054.

[0074] In this invention, the continuous inflow of steam into the heat exchange tubes 302 pressurizes the condensate, causing it to flow through the branch pipe 3053 and the first drain pipe 3051 into the water collection tubes 307. Subsequently, the condensate in the water collection tubes 307 is promptly discharged into the water collection tank 309 via the second drain pipe 3052. Simultaneously, the heat exchange tubes 302 on both sides of the water collection tubes 307 heat the tubes, further preventing the condensate inside from freezing.

[0075] In some embodiments, reference Figure 8 It is known that the second drainage network group 306 includes at least one water pump 3061, a first water pumping pipe 3062 and a second water pumping pipe 3063. The two ends of the first water pumping pipe 3062 are connected to the inlet of the water pump 3061 and the outlet of the water collection tank 309, respectively. The second water pumping pipe 3063 is connected to the outlet of the water pump 3061 to discharge condensate into the external pipe network.

[0076] In this invention, reference Figure 8 It is known that two water pumps 3061 are connected in parallel to improve the efficiency of pumping condensate from the collection tank 309. The first pumping pipe 3062 branches into two branch pipes at the end facing the pumps, which are connected to the inlets of the two pumps 3061. Furthermore, the second pumping pipe 3063 connected to each pump 3061 is connected to a third drain pipe 3067, which is connected to an external pipe network to discharge the condensate into the network for recycling. A second drain valve 3065 is also installed on the third drain pipe 3067.

[0077] The second water pumping pipe 3063, the first water pumping pipe 3062, and the two branch pipes of the water pumping pipe are all equipped with a first drain valve 3064.

[0078] The present invention allows for convenient adjustment of the water pump's inlet and outlet flow rates by installing valves before and after the pump, preventing excessive water intake and overload operation under certain circumstances. Furthermore, installing valves before the pump prevents water loss during pump maintenance, ensuring that water resources are not wasted.

[0079] In some embodiments, a pump start-stop electrical control component 308 is provided on the water collection tank 309, which can control the water pump 3061 to start or stop according to the condensate water level in the water collection tank 309.

[0080] The pump start / stop electrical control component 308 includes a liquid level sensor and a controller. The liquid level sensor is used to measure the water level of the condensate in the water collection tank 309, and the controller is used to control the start / stop of the water pump and the drainage rate according to the value of the liquid level sensor.

[0081] In this invention, after the controller detects that the water level in the water collection tank 309 has reached a predetermined value via a level sensor, it activates the externally connected water pump 3061 to discharge the condensate into the external pipe network. Furthermore, the pumping speed is adjusted according to the rate of water level rise.

[0082] In some embodiments, a water pressure gauge 3066 is provided on the third drain pipe 3067 for measuring the water pressure in the third water pipe.

[0083] In some embodiments, the water collection tank 309 is provided with an air vent valve 3091 at the top and a drain valve at the bottom.

[0084] The vent valve 3091 is used to release gas from the water collection tank 309 to prevent excessive air pressure and condensate from the water collection tubes 307 from flowing into the water collection tank 309. The drain valve is used to drain any water that has not been drained from the water collection tank 309. Multiple inlet pipes 3092 are installed above the drain valves in the water collection tank 309, and a second drain pipe 3052 is connected to the inlet pipes 3092 of the water collection tank 309.

[0085] The water collection tank 309 can be used to collect condensate from multiple heat exchange devices 3.

[0086] In some embodiments, the drying equipment further includes a backflushing assembly for cleaning residual steam in the gas storage tank 3041 and residual condensate in the water collection tank 309.

[0087] In some embodiments, reference Figure 6 It is known that the backflush assembly includes an air compressor 8, the outlet of which is connected to a compressed air pipe 801, which is connected to a third drain pipe 3067. Additionally, a branch pipe is provided on the compressed air pipe 801, which is connected to a fourth air pipe 3043.

[0088] Control valves are installed on both the branch gas pipe and the end of the compressed air pipe 801 near the third drain pipe 3067.

[0089] In this invention, reference Figure 8 and Figure 9 It can be seen that after the entire drying equipment is shut down, the compressed air generated by the compressed air compressor 8 enters the air storage tank 3041 through the branch pipe, so as to drive the residual steam in the air storage tank 3041 to be discharged into the ground through the exhaust pipe group, thereby emptying the air storage tank 3041 to ensure the temperature of the gas when it is filled again and improve the working efficiency; the water flows into the water collection tank 309 through the third drain pipe 3067 and the second drain net group 306, driving the water in the water collection tank 309 to be discharged from the drain valve, so as to prevent the water collection tank 309 from freezing after the equipment is shut down.

[0090] In some embodiments, the drying equipment further includes a grain storage silo 4 and a grain conveying mechanism 5. The grain conveying mechanism 5 includes a first scraper conveyor 501 and a first elevator 502. The two ends of the first scraper conveyor 501 are located between the discharge port of the grain storage silo 4 and the first elevator 502. The first elevator 502 is used to convey the grain to the top inlet of the drying tower 1 to continuously supply the drying tower 1, thereby preventing the temperature inside the drying tower 1 from rising sharply due to insufficient replenishment of the grain.

[0091] In some embodiments, a grain conveyor 7 is provided outside the drying equipment, and a second elevator 503 is connected to the tail end of the grain conveyor 7. The top end of the second elevator 503 is connected to the top grain inlet of the grain silo.

[0092] The grain conveyor 7 transports the grain to be dried to the inlet of the second elevator 503, and then flows into the grain bin from the top outlet of the second elevator 503.

[0093] In some embodiments, a first conveyor 505 and a second conveyor 506 are provided at the grain outlet at the bottom of the drying tower 1.

[0094] The tail end of the first conveyor 505 is connected to the third elevator 507, the tail end of the second conveyor 506 is connected to the fourth elevator 508, and the third elevator 507 and the fourth elevator 508 are connected to the head ends of the second scraper conveyor 509 and the third scraper conveyor 510.

[0095] The tail ends of the second scraper conveyor 509 and the third scraper conveyor 510 are both connected to the external grain depot.

[0096] In this invention, the output temperature of the heat exchange device 3 can be controlled by adjusting the amount of cold air entering each heat pump 2 to adjust the temperature of the hot air entering the drying tower 1, thereby enabling the drying tower 1 to output grains with different humidity levels to meet the requirements of different humidity levels of grains in terms of food safety, quality, processing efficiency and energy utilization.

[0097] Meanwhile, the grain output from the drying tower 1 in this invention is conveyed to the positions of the third elevator 507 and the fourth elevator 508 by the first conveyor 505 and the second conveyor 506 respectively, and the grain is lifted to the corresponding height by the third elevator 507 and the fourth elevator 508. At this time, the grain output from the drying tower 1 needs to be processed, and the grain can be directly conveyed to the transport truck by the third elevator 507 and the fourth elevator 508. When the grain needs to be stored in the grain warehouse, the grain can be conveyed to the second scraper 509 and the third scraper 510 by the third elevator 507 and the fourth elevator 508.

[0098] In some embodiments, a cooling zone is provided above the grain outlet at the lower end of the drying tower 1, and a cold air pump 6 is connected to the outside of the drying tower 1 to input air into the cooling zone.

[0099] The drying equipment also includes a cold air pump 6, which supplies cold air to the cooling zone through a cold air pipe 601 to reduce the temperature of the zone and prevent the output grain from being too hot.

[0100] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. The present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be considered as part of the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A drying device, characterized in that, include: Drying tower (1); The drying tower (1) is divided into multiple drying zones with gradually decreasing temperature along the vertical direction, and the drying zones are interconnected; Multiple hot air pumps (2), each of the hot air pumps (2) is connected to a first air pipe (201), and the air outlets of the multiple first air pipes (201) are correspondingly connected to multiple drying areas; The heat exchange device (3) includes a heat exchange chamber (301), a plurality of heat exchange tubes (302) are provided in the heat exchange chamber (301), a plurality of second air pipes (303) are connected to the heat exchange chamber (301), and the outlets of the plurality of second air pipes (303) are correspondingly connected to the plurality of hot air pumps (2). At least one of the first air pipes (201) is connected to a return air pipe (202), and the other end of the return air pipe (202) is connected to the air inlet of the heat exchange chamber (301) so that the partially heated air in the first air pipe (201) is returned to the heat exchange chamber (301).

2. The drying equipment according to claim 1, characterized in that, The heat exchange chamber (301) is provided with two sets of heat exchange tubes (302) spaced apart along the first direction. Each set of heat exchange tubes (302) is provided with multiple heat exchange tubes (302) spaced apart along the second direction. The heat exchange device (3) also includes an air supply network group (304), a water collection tank (309), and a first drainage network group (305). The gas supply network group (304) is used to supply steam to the two sets of heat exchange tubes (302). Each set of heat exchange tubes (302) is connected to the first drainage network group (305) to drain the condensate in the heat exchange tubes (302) into the water collection tank (309). The water collection tank (309) is also connected to the second drainage network group (306), which is used to drain the water in the water collection tank (309) into the external pipe network.

3. The drying equipment according to claim 2, characterized in that, The gas supply network group (304) includes a gas storage tank (3041), a third gas pipe (3042), and at least one fourth gas pipe (3043). The third gas pipe (3042) is connected to the air inlet on the gas storage tank (3041), and the fourth gas pipe (3043) is connected to the air outlet on the gas storage tank (3041). The third gas pipe (3042) is used to transport steam into the gas storage tank (3041), and the fourth gas pipe (3043) is used to transport the steam in the gas storage tank (3041) into the two sets of heat exchange tubes (302). An electric regulating valve (310) is provided on the fourth gas pipe (3043) to regulate the steam flow rate in the fourth gas pipe (3043).

4. The drying equipment according to claim 3, characterized in that, The fourth trachea (3043) is connected to a first bronchus (3044) and a second bronchus (3045). The first bronchus (3044) and the second bronchus (3045) are each connected to a plurality of third bronchus (3046). The third trachea (3042) is used to connect the first bronchus (3044) to a set of heat exchange tubes (302) and to connect the second bronchus (3045) to another set of heat exchange tubes (302).

5. The drying equipment according to claim 2, characterized in that, The first drainage network group (305) includes a first drainage pipe (3051), a second drainage pipe (3052) and multiple branch pipes (3053), and each heat exchange tube (302) is provided with a water collection tube (307); One end of each of the multiple branch water pipes (3053) is connected to one of the multiple heat exchange tubes (302), and the other end is connected to the first drain pipe (3051). The outlet of the first drain pipe (3051) is connected to the inlet of the water collection tube (307). Both ends of the second drain pipe (3052) are connected to the outlet of the water collection tube (307) and the inlet of the water collection tank (309).

6. The drying equipment according to claim 2, characterized in that, The second drainage network group (306) includes at least one water pump (3061), a first water pumping pipe (3062) and a second water pumping pipe (3063). The two ends of the first water pumping pipe (3062) are connected to the inlet of the water pump (3061) and the outlet of the water collection tank (309). The second water pumping pipe (3063) is connected to the outlet of the water pump (3061) to discharge condensate into the external pipe network.

7. The drying equipment according to claim 6, characterized in that, The water collection tank (309) is equipped with a pump start-stop electrical control component (308), which can control the water pump (3061) to start or stop according to the water level in the water collection tank (309).

8. The drying equipment according to claim 1, characterized in that, The drying equipment also includes a grain storage silo (4) and a grain conveying mechanism (5). The grain conveying mechanism (5) includes a first scraper conveyor (501) and a first elevator (502). The two ends of the first scraper conveyor (501) are located between the discharge port of the grain storage silo (4) and the first elevator (502). The first elevator (502) is used to convey the grain to the top inlet of the drying tower (1).

9. The drying equipment according to claim 1, characterized in that, A cooling area is provided above the grain outlet at the lower end of the drying tower (1), and a cold air pump (6) is connected to the outside of the drying tower (1) to input air into the cooling area.

10. The drying equipment according to claim 9, characterized in that, A cooling pipe (601) is connected between the cooling pump (6) and the drying tower (1).

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