Energy-saving damp and hot air flow drying and air supplementing device for grain drying

Abstract

The invention discloses an energy-saving damp and hot airflow drying and air supplementing device for grain drying. A damp and hot air opening, a direct air supplementing opening, a hot air supplementing opening, an air return opening and a dehumidification opening are sequentially formed in a shell from bottom to top. The porous core column is installed in the shell and provided with at least one direct air supplementing channel and at least one damp and hot air channel, an air inlet of the direct air supplementing channel is communicated with the direct air supplementing opening, an air outlet of the direct air supplementing channel is communicated with the air return opening, and an air inlet of the damp and hot air channel is communicated with the damp and hot air opening; the breathable heat accumulator is installed in the shell, an air outlet channel of the breathable heat accumulator communicates with an air outlet of the humid and hot air channel and the dehumidification opening, and an air inlet channel of the heat accumulator communicates with the hot air supplementing opening and the air return opening. The device adopts a means of simultaneously storing moisture removal and air supply, does not cause the fluctuation of the pressure of a drying system, and is suitable for large-scale or long-stroke multi-point airflow moisture removal and drying work; in addition, on the basis of the waste heat recovery function, fresh air supplemented to the outside is heated, the heat loss is small, and the utilization rate is high.

Description

Technical Field

[0001] The invention relates to the technical field of airflow drying equipment, in particular to an energy-saving grain drying wet hot airflow drying air supply device. Background Art

[0002] Mechanized grain drying is an important part of grain production, but the energy consumption is high during grain drying. Usually, airflow drying is used to evaporate and remove moisture from grain. After the dry hot air flows through the grain, it becomes hot and humid air. The hot and humid air is usually emptied and processed, directly wasting the heat energy in the hot and humid air. In the prior art, the Chinese invention patent with the authorization number CN116697733B and the name of a gas-liquid two-phase waste heat recovery process, equipment and application in grain drying can only reduce dust and recover waste heat from hot exhaust gas containing a large amount of dust.

[0003] It is well known that when grains are dried by airflow, hot and humid air with a large amount of water vapor will inevitably be produced. When the existing technical means are applied to the grain drying process, the waste heat is only collected separately. First, the influence of water vapor is not considered; second, the waste heat is not directly converted and used in grain drying after collection, which causes more heat loss; finally, the terminal exhaust gas is simply processed without replenishing air to the airflow drying system. If a larger scale or longer stroke drying mode is used, multi-point interval exhaust dehumidification is required, which usually causes a large pressure loss in the drying system, and the total end air replenishment response time is long and the error is large, affecting the drying effect. Therefore, it is necessary to provide a grain drying hot and humid airflow drying air replenishment device that is more suitable for the grain drying system and has stable air pressure and dehumidification on the basis of waste heat recovery. Summary of the invention

[0004] The purpose of the present invention is to provide an energy-saving grain drying hot and humid air flow drying and air supply device to solve the problem that the existing air flow dehumidification equipment can only process terminal exhaust gas, is not suitable for multi-point dehumidification work of the drying system, and cannot stabilize the air pressure.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: An energy-saving grain drying hot and humid air flow drying and air supplying device, comprising: The shell is provided with a moist heat air outlet, a direct air supply outlet, a hot air supply outlet, a return air outlet and a dehumidification outlet in sequence from bottom to top; A porous core column, wherein the porous core column is installed in the shell, and the porous core column is provided with at least one direct supplementary air duct and at least one moist and hot air duct which are independent of each other, the air inlet of the direct supplementary air duct is connected with the direct supplementary air outlet, the air outlet of the direct supplementary air duct is connected with the return air outlet, and the air inlet of the moist and hot air duct is connected with the moist and hot air outlet; The air-permeable heat storage body is installed in the shell, the air outlet channel of the air-permeable heat storage body is respectively connected with the air outlet of the moist and hot air duct and the dehumidification port, and the air inlet channel of the heat storage body is respectively connected with the heat supply air port and the return air port.

[0006] A further technical solution is: the return air ports are respectively located on both sides of the shell and are connected to the air inlet end of the exhaust fan.

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

[0008] A further technical solution is that an analog air valve is provided on the air inlet end of the direct air supply port.

[0009] A further technical solution is: the air-permeable 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 sandwich cavity, the air outlet channel passes through the inner cylinder and the outer cylinder, and the air inlet channel is arranged in the sandwich 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 located at the bottom of the porous core column is arranged in the shell, and the water receiving tray is connected to a drainage pipe extending out of the shell.

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

[0013] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: The present invention proposes an energy-saving grain drying hot and humid air flow drying and air replenishing device, which adopts a means of dehumidification and air replenishment at the same time. When dehumidifying, the air pressure is reduced by the amount of airflow discharged, and the fresh air from the outside is replenished in the drying system in time, which will not cause fluctuations in the pressure of the drying system, or at least will not cause large fluctuations to affect the airflow drying effect. It is suitable for large-scale or long-stroke multi-point airflow dehumidification and drying work; in addition, based on the waste heat recovery function, the heat in the discharged hot and humid air can be collected and reused, and directly converted at the time to heat the fresh air replenished from the outside, with less heat loss and higher heat utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an energy-saving grain drying hot and humid air flow drying and air supply device of the present invention.

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

[0016] Figure 3 For the present invention Figure 1 Schematic diagram of the internal structure.

[0017] Figure 4 For the present invention Figure 2 Schematic diagram of the structure of the medium porous core column.

[0018] Figure 5 For the present invention Figure 4 Schematic diagram of the structure from another perspective.

[0019] Figure 6 For the present invention Figure 2 Schematic diagram of the structure of the medium-permeable thermal storage body.

[0020] Figure numerals: 1. Shell; 11. Wet and hot air outlet; 12. Direct supply air outlet; 13. Hot supply air outlet; 14. Return air outlet; 15. Dehumidification outlet; 2. Porous core column; 21. Direct supply air duct; 22. Wet and hot air duct; 3. Breathable heat storage body; 31. Inner cylinder; 32. Outer cylinder; 33. Porous solid heat storage material; 34. Clip cavity; 35. Phase change heat storage material; 4. Exhaust fan; 5. Dehumidification fan; 6. Analog air valve; 7. Water collection tray; 8. Drain pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Embodiment 1: In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an energy-saving grain drying hot and humid air flow drying and air supplying device comprises: The shell 1 is provided with a moist heat air outlet 11, a direct supply air outlet 12, a hot supply air outlet 13, a return air outlet 14 and a dehumidification outlet 15 in sequence from bottom to top; A porous core column 2, the porous core column 2 is installed in the shell 1, and at least one direct supplementary air duct 21 and at least one moist and hot air duct 22 are independently provided on the porous core column 2, the air inlet of the direct supplementary air duct 21 is connected to the direct supplementary air outlet 12, the air outlet of the direct supplementary air duct 21 is connected to the return air outlet 14, and the air inlet of the moist and hot air duct 22 is connected to the moist and hot air outlet 11; The air-permeable heat storage body 3 is installed in the shell 1, and the air outlet channel of the air-permeable heat storage body 3 is respectively connected with the air outlet and the dehumidification port 15 of the moist and hot air duct 22, and the air inlet channel of the heat storage body 3 is respectively connected with the heat supply air port 13 and the return air port 14.

[0028] In large-scale or long-stroke grain drying systems, such as the processing and drying of root crops, due to the high water content and large size, a longer drying stroke is required. Of course, it can also be used for the drying of agricultural and by-products, such as tea, which needs to simulate the isostatic drying environment. The scale is large, and the drying of the drying airflow and the stability of the air pressure must be guaranteed. It is necessary to work with a smaller drying airflow and use a multi-point arrangement to process the moist and hot airflow. Therefore, based on the premise of the above-mentioned drying system, the device is used as follows: first, the moist and hot air outlet 11 of the device is connected to the dehumidification port of the drying system. The moist and hot airflow first passes through the porous core column 2, and then passes through the breathable heat storage body 3 to collect the residual heat in the moist and hot airflow. At the same time, the drying system loses as much air pressure as possible, and the direct air outlet 12 and the hot air outlet 13 are used to replenish the fresh air from the outside. When replenishing, the direct air outlet 12 is a fast and large amount of normal temperature air, and the hot air outlet 13 is a normal speed hot air. Because the direct supply air inlet 12 brings the outside fresh air through the direct supply air duct 21 of the porous core column 2, and then enters the drying system through the return air inlet, the fresh air directly exchanges heat with the wet and hot air duct 22 of the porous core column 2, which is a preliminary heat exchange with low heat exchange efficiency, so it is generally room temperature air, mainly to replenish the pressure loss in time and minimize the impact on the air pressure in the drying system; the hot supply air inlet 13 slowly sends the outside fresh air into the drying system through the breathable heat storage body 3 and the return air inlet. During this period, the breathable heat storage body 3 effectively heats the slow-flowing fresh air, which is a secondary heat exchange, effectively improving the utilization efficiency of waste heat, promoting the increase in the temperature of the fresh air, and reducing the impact of the external fresh air on the temperature in the drying system. It is also suitable for isostatic drying systems with small air pressure fluctuations, and finally the exhaust gas is discharged through the dehumidification port 15.

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

[0030] The exhaust fan 4 can promote the introduction 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 end of the dehumidification fan 5 .

[0032] Preferably, an analog air valve 6 is provided on the air inlet end of the direct air supply port 12 .

[0033] On the basis of the analog air volume valve 6, an electric control method may be adopted, such as setting 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] Embodiment 2: Based on the above embodiments, this embodiment Figure 6As shown, the air-permeable 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 sandwich cavity 34, the air outlet channel passes through the inner cylinder 31 and the outer cylinder 32, and the air inlet channel is arranged in the sandwich cavity 34.

[0035] The moist hot airflow flows through the air-permeable heat storage body 3 through the air outlet channel, and the porous solid heat storage material 33 (which does not hinder the passage of airflow) filled in the air outlet channel can absorb the heat of the moist hot airflow passing therethrough.

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

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

[0038] Phase change heat storage material 35, such as paraffin, further ensures the collection and utilization of waste heat.

[0039] Embodiment three: On the basis of the above-mentioned embodiment, this embodiment shows that a water receiving tray 7 located at the bottom of the porous core column 2 is provided in the shell 1 , and the water receiving tray 7 is connected to a drainage pipe 8 extending out of the shell 1 .

[0040] When the humid hot air flow exchanges heat with the fresh air, the water vapor in the humid hot air flow will inevitably condense into beads. The water receiving tray 7 can be used to collect water and prevent the water droplets from falling into the drying system, thereby avoiding the influence of the water droplets on the drying materials. The drain pipe 8 is used to discharge the condensed water collected in the water receiving tray 7 in time.

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

[0042] It is beneficial to improve the heat exchange effect of fresh air and humid hot air flow.

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

Claims

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

2. The energy-saving grain drying hot and humid air flow drying and air supply device according to claim 1 is characterized in that: The return air ports (14) are respectively located on two sides of the housing (1) and are connected to the air inlet end of the exhaust fan (4).

3. The energy-saving grain drying hot and humid air flow drying and air supply device according to claim 1 is characterized in that: The dehumidification port (15) is in communication with an air inlet end of the dehumidification fan (5).

4. The energy-saving grain drying hot and humid air flow drying and air supply device according to claim 1 is characterized in that: An analog air volume valve (6) is provided on the air inlet end of the direct air supply port (12).

5. The energy-saving grain drying hot and humid air flow drying and air supply device according to claim 1 is characterized in that: The air-permeable heat storage body (3) comprises 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 a sandwich cavity (34) is formed between the two; the air outlet channel passes through the inner cylinder (31) and the outer cylinder (32); and the air inlet channel is arranged in the sandwich cavity (34).

6. The energy-saving grain drying hot and humid air flow drying and air supply device according to claim 5 is characterized in that: The clamping cavity (34) is filled with a phase-change heat storage material (35).

7. The energy-saving grain drying hot and humid air flow drying and air supply device according to claim 1 is characterized in that: A water receiving tray (7) located at the bottom of the porous core column (2) is arranged inside the shell (1), and the water receiving tray (7) is connected to a drainage pipe (8) extending out of the shell (1).

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

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