An energy-saving grain drying system with moist airflow for replenishing air supply.

Abstract

This invention discloses an energy-saving grain drying device for moist and hot airflow. The housing, from bottom to top, is equipped with a moist and hot air inlet, a direct air supply inlet, a hot air supply inlet, a return air inlet, and a dehumidification inlet. A porous core column is installed inside the housing, with at least one direct air supply duct and at least one moist and hot air duct. The inlet of the direct air supply duct is connected to the direct air supply outlet, and the outlet of the direct air supply duct is connected to the return air inlet. The inlet of the moist and hot air duct is connected to the moist and hot air supply outlet. A breathable heat storage body is installed inside the housing. The outlet channel of the breathable heat storage body is connected to the outlet of the moist and hot air duct and the dehumidification inlet, respectively, and the inlet channel of the heat storage body is connected to the hot air supply inlet and the return air inlet, respectively. This device integrates dehumidification and air supply, preventing pressure fluctuations in the drying system and making it suitable for large-scale or long-stroke multi-point airflow dehumidification drying operations. Furthermore, based on the waste heat recovery function, the incoming fresh air is heated, resulting in less heat loss and higher utilization.

Description

Technical Field

[0001] This invention relates to the field of airflow drying equipment technology, and in particular to an energy-saving grain drying wet-heat airflow drying supplementary air device. Background Technology

[0002] Mechanized grain drying is a crucial step in grain production, but it is energy-intensive. Typically, airflow drying is used to evaporate and remove moisture from the grain. However, the hot airflow becomes humid air after passing through the grain, which is usually vented away, resulting in a direct waste of its heat energy. Existing technology, such as the Chinese invention patent with authorization number CN116697733B entitled "A Gas-Liquid Two-Phase Waste Heat Recovery Process, Equipment and its Application in Grain Drying," only addresses dust suppression and waste heat recovery from hot exhaust gas containing a large amount of dust.

[0003] It is well known that when grain is dried using airflow, humid and hot air with a high moisture content is inevitably generated. Current technologies for grain drying simply collect waste heat, failing to consider the impact of moisture. Furthermore, the collected waste heat is not directly used in the drying process, resulting in significant heat loss. Finally, only the exhaust gas is treated without replenishing the airflow drying system. In large-scale or long-stroke drying operations, multiple-point dehumidification is required, which typically leads to significant pressure loss in the drying system, long response time and large errors in the replenishment process, thus affecting drying efficiency. Therefore, a grain drying humid and hot airflow replenishment device that provides stable pressure and dehumidification, in addition to the basic function of waste heat recovery, is needed. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving grain drying humid airflow drying and replenishment air device to solve the problems of existing airflow dehumidification equipment that can only handle terminal exhaust gas, are not suitable for multi-point dehumidification of drying systems, and cannot stabilize air pressure.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An energy-saving grain drying humid heat airflow replenishment air device includes: The housing is provided with, from bottom to top, a humid heat air inlet, a direct supply air inlet, a heat supply air inlet, a return air inlet, and a dehumidification inlet; A porous core column is installed inside the housing. The porous core column is provided with at least one direct air duct and at least one hot and humid air duct that are independent of each other. The air inlet of the direct air duct is connected to the direct air outlet, the air outlet of the direct air duct is connected to the return air outlet, and the air inlet of the hot and humid air duct is connected to the hot and humid air outlet. A breathable heat storage body is installed inside the housing. The air outlet of the breathable heat storage body is connected to the air outlet of the humid heat duct and the dehumidification port, respectively. The air inlet of the heat storage body is connected to the heat supply air port and the return air port, respectively.

[0006] A further technical solution is that the return air inlets are located on both sides of the housing and are connected to the air inlet of the exhaust fan.

[0007] A further technical solution is that the dehumidification port is connected to the air inlet of the exhaust fan.

[0008] A further technical solution is that an analog air volume valve is installed on the air inlet end of the direct compensation air outlet.

[0009] A further technical solution is: the breathable heat storage body includes an inner cylinder, an outer cylinder, and a porous solid heat storage material. The porous solid heat storage material is filled in the inner cylinder. The inner cylinder is installed in the outer cylinder, and the two form a cavity. The air outlet channel passes through the inner cylinder and the outer cylinder, and the air inlet channel is disposed in the cavity.

[0010] A further technical solution is that the cavity is filled with a phase change heat storage material.

[0011] A further technical solution is: a water receiving tray is provided inside the housing at the bottom of the porous core column, and the water receiving tray is connected to a drain pipe extending out of the housing.

[0012] A further technical solution is that the direct-supply air duct and the humid-heat air duct are alternately arranged.

[0013] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: This invention proposes an energy-saving grain drying humid airflow replenishment device. This device integrates dehumidification and replenishment, reducing air pressure by the amount of airflow discharged during dehumidification and replenishing fresh air from outside in a timely manner. This prevents pressure fluctuations in the drying system, or at least avoids significant fluctuations that could affect the airflow drying effect. It is suitable for large-scale or long-stroke multi-point airflow dehumidification drying operations. Furthermore, based on waste heat recovery, the heat from the discharged humid air can be collected and reused, and directly converted to heat the replenished fresh air, resulting in minimal heat loss and high heat utilization. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an energy-saving grain drying and moist airflow replenishment device according to the present invention.

[0015] Figure 2 For the present invention Figure 1An explosion diagram.

[0016] Figure 3 For the present invention Figure 1 A schematic diagram of the internal structure of the device.

[0017] Figure 4 For the present invention Figure 2 A schematic diagram of the structure of a porous core column.

[0018] Figure 5 For the present invention Figure 4 A structural diagram from another perspective.

[0019] Figure 6 For the present invention Figure 2 A schematic diagram of the structure of a medium-permeable heat storage body.

[0020] Reference numerals: 1. Shell; 11. Humidity and heat air outlet; 12. Direct air supply outlet; 13. Heat supply air outlet; 14. Return air outlet; 15. Dehumidification outlet; 2. Porous core column; 21. Direct air supply duct; 22. Humidity and heat air duct; 3. Breathable heat storage body; 31. Inner cylinder; 32. Outer cylinder; 33. Porous solid heat storage material; 34. Jacket; 35. Phase change heat storage material; 4. Exhaust fan; 5. Dehumidification fan; 6. Analog air volume valve; 7. Water collection tray; 8. Drain pipe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used 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. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1: This implementation example Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an energy-saving grain drying humid heat airflow replenishment air device includes: The housing 1 is provided with a humid heat air outlet 11, a direct air supply outlet 12, a heat supply air outlet 13, a return air outlet 14, and a dehumidification outlet 15 from bottom to top. A porous core column 2 is installed inside the housing 1. The porous core column 2 is provided with at least one direct air supply duct 21 and at least one hot and humid air supply duct 22 that are independent of each other. The air inlet of the direct air supply duct 21 is connected to the direct air supply outlet 12, the air outlet of the direct air supply duct 21 is connected to the return air outlet 14, and the air inlet of the hot and humid air supply duct 22 is connected to the hot and humid air supply outlet 11. The breathable heat storage body 3 is installed inside the housing 1. The air outlet of the breathable heat storage body 3 is connected to the air outlet and dehumidification port 15 of the humid heat duct 22, respectively. The air inlet of the heat storage body 3 is connected to the heat supply air port 13 and return air port 14, respectively.

[0028] In large-scale or long-stroke grain drying systems, such as the processing and drying of root and tuber crops, due to their high moisture content and large size, a long drying stroke is required. This can also be used for drying agricultural and by-products, such as tea, requiring a simulated isostatic pressure drying environment. On a larger scale, it is crucial to ensure the dryness of the airflow and the stability of the air pressure, necessitating the use of a smaller drying airflow and employing a multi-point arrangement to process the humid and hot airflow. Therefore, based on the aforementioned drying system, this device is used as follows: First, the humid and hot air inlet 11 of the device is connected to the exhaust port of the drying system. The humid and hot airflow first passes through the porous core column 2, and then through the breathable heat storage body 3 to collect the residual heat in the humid and hot airflow. Simultaneously, to compensate for the air pressure loss in the drying system, fresh air is introduced from the outside via the direct replenishment air inlet 12 and the hot replenishment air inlet 13. During replenishment, the direct replenishment air inlet 12 rapidly and in large quantities supplies room temperature air, while the hot replenishment air inlet 13 supplies hot air at a normal speed. Because the direct air supply vent 12 brings in fresh air from the outside through the direct air supply duct 21 of the porous core column 2, and then into the drying system through the return air vent, the fresh air directly exchanges heat with the hot and humid air duct 22 of the porous core column 2. This is a preliminary heat exchange, and the heat exchange efficiency is low, so it is generally room temperature air. The main purpose is to replenish the pressure loss in time and minimize the impact on the air pressure in the drying system. The hot air supply vent 13 slowly sends fresh air from the outside into the drying system through the breathable heat storage body 3 and the return air vent. During this period, the breathable heat storage body 3 effectively heats the slow-flowing fresh air, which is a secondary heat exchange. This effectively improves the waste heat utilization efficiency, promotes the increase of the fresh air temperature, and reduces the impact of the incoming fresh air on the temperature in the drying system. It is also suitable for isostatic drying systems with small air pressure fluctuations. Finally, the exhaust gas is discharged through the dehumidification vent 15.

[0029] Preferably, the return air inlets 14 are located on both sides of the housing 1 and are connected to the air inlet of the exhaust fan 4.

[0030] The exhaust fan 4 can promote the replenishment of fresh air into the drying system, reduce pressure loss, and ensure the drying effect.

[0031] Preferably, the dehumidification port 15 is connected to the air inlet of the exhaust fan 5.

[0032] Preferably, a simulated air volume valve 6 is provided on the air inlet end of the direct air supply outlet 12.

[0033] Based on the analog air volume valve 6, electronic control methods can be used, such as installing temperature, humidity, and air pressure sensors on the housing 1, and coordinating and controlling the temperature, humidity, and air pressure of the device through a processor.

[0034] Example 2: Based on the above embodiments, this embodiment, for example Figure 6As shown, the breathable heat storage body 3 includes an inner cylinder 31, an outer cylinder 32, and a porous solid heat storage material 33. The porous solid heat storage material 33 is filled in the inner cylinder 31. The inner cylinder 31 is installed in the outer cylinder 32, and the two form a cavity 34. The air outlet channel runs through the inner cylinder 31 and the outer cylinder 32, and the air inlet channel is set in the cavity 34.

[0035] The hot and humid airflow flows through the air outlet channel and then through the breathable heat storage body 3. The porous solid heat storage material 33 filling the air outlet channel (which does not obstruct the airflow) can also absorb the heat of the hot and humid airflow passing through it.

[0036] The porous solid heat storage material 33 can be a porous ceramic matrix or made from pebbles.

[0037] Preferably, the cavity 34 is filled with a phase change heat storage material 35.

[0038] Phase change heat storage materials, such as paraffin wax, further ensure the collection and utilization of waste heat.

[0039] Example 3: Based on the above embodiments, this embodiment shows that a water receiving tray 7 is provided inside the housing 1 at the bottom of the porous core column 2, and the water receiving tray 7 is connected to a drain pipe 8 extending out of the housing 1.

[0040] When the hot and humid airflow exchanges heat with the fresh air, the water vapor in the hot and humid airflow will inevitably condense into beads. The water collection tray 7 can be used to collect water and prevent water droplets from falling into the drying system, thus avoiding the impact of water droplets on the dried materials. The drain pipe 8 is used to discharge the condensate collected in the water collection tray 7 in a timely manner.

[0041] Preferably, the direct supply air duct 21 and the humid heat air duct 22 are arranged alternately.

[0042] It helps to improve the heat exchange effect of fresh air and humid airflow.

[0043] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving grain drying device for moist and hot airflow drying and replenishment, characterized in that, include: The housing (1) is provided with a humid heat air inlet (11), a direct air supply inlet (12), a heat supply air inlet (13), a return air inlet (14) and a dehumidification inlet (15) from bottom to top. A porous core column (2) is installed inside the housing (1). The porous core column (2) is provided with at least one direct air supply duct (21) and at least one hot and humid air supply duct (22) that are independent of each other. The air inlet of the direct air supply duct (21) is connected to the direct air supply outlet (12), the air outlet of the direct air supply duct (21) is connected to the return air outlet (14), and the air inlet of the hot and humid air supply duct (22) is connected to the hot and humid air outlet (11). A breathable heat storage body (3) is installed inside the housing (1). The air outlet of the breathable heat storage body (3) is connected to the air outlet of the hot and humid air duct (22) and the dehumidification port (15) respectively. The air inlet of the heat storage body (3) is connected to the heat supply air port (13) and the return air port (14) respectively.

2. The energy-saving grain drying wet and hot airflow drying and replenishment air device according to claim 1, characterized in that: The return air inlets (14) are located on both sides of the housing (1) and are connected to the air inlet of the exhaust fan (4).

3. The energy-saving grain drying wet and hot airflow drying and replenishment air device according to claim 1, characterized in that: The dehumidification port (15) is connected to the air inlet of the exhaust fan (5).

4. The energy-saving grain drying wet and hot airflow drying and replenishment air device according to claim 1, characterized in that: The direct air supply outlet (12) is equipped with an analog air volume valve (6) at its air inlet end.

5. The energy-saving grain drying wet and hot airflow drying and replenishment air device according to claim 1, characterized in that: The breathable heat storage body (3) includes an inner cylinder (31), an outer cylinder (32) and a porous solid heat storage material (33). The porous solid heat storage material (33) is filled in the inner cylinder (31). The inner cylinder (31) is installed in the outer cylinder (32) and the two form a cavity (34). The air outlet channel runs through the inner cylinder (31) and the outer cylinder (32). The air inlet channel is located in the cavity (34).

6. The energy-saving grain drying wet and hot airflow drying and replenishment air device according to claim 5, characterized in that: The cavity (34) is filled with phase change heat storage material (35).

7. The energy-saving grain drying wet and hot airflow drying and replenishment air device according to claim 1, characterized in that: The housing (1) is provided with a water receiving tray (7) located at the bottom of the porous core column (2), and the water receiving tray (7) is connected to a drain pipe (8) extending out of the housing (1).

8. The energy-saving grain drying wet and hot airflow drying and replenishment air device according to claim 1, characterized in that: The direct supply air duct (21) and the hot and humid air duct (22) are alternately arranged.

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