CN109708439B - Drying system of ion wind composite film total heat exchanger - Google Patents

Drying system of ion wind composite film total heat exchanger Download PDF

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CN109708439B
CN109708439B CN201910048860.5A CN201910048860A CN109708439B CN 109708439 B CN109708439 B CN 109708439B CN 201910048860 A CN201910048860 A CN 201910048860A CN 109708439 B CN109708439 B CN 109708439B
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box body
air
heat exchanger
total heat
ion wind
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CN109708439A (en
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梁才航
何智鹏
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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Abstract

The invention relates to a drying system of an ion wind composite membrane total heat exchanger, which comprises a box body, an ion wind generating device and a circulating wind path; the ion wind generating device is positioned in the box body and forms ion wind so as to accelerate the evaporation speed of the water of the dried materials in the box body; the circulating air path is arranged on the outer side of the box body and communicated with the box body to enable low-temperature high-humidity air in the box body to circularly flow, and the circulating air path is also provided with a dehumidification heating device which enables the low-temperature high-humidity air in the box body to exchange heat and water molecules with the high-temperature low-humidity air outside the box body. The beneficial effects of the invention are as follows: the novel device for the electrohydrodynamic drying and membrane type heat exchanger is designed by combining the electrohydrodynamic drying machine and the membrane type total heat exchanger, so that the drying quality and the thermal efficiency of materials are improved, the later operation cost is reduced, the energy is saved, the environment is protected, and the market prospect is very good.

Description

Drying system of ion wind composite film total heat exchanger
Technical Field
The invention relates to the field of material drying, in particular to a drying system of an ion wind composite membrane total heat exchanger.
Background
Most of the existing drying technologies are traditional hot air drying, and are drying methods in which hot air is blown into an oven or a drying chamber to accelerate air flow. For materials such as food, which are unstable when being heated, the heat is extremely easy to cause adverse effects on internal tissues, colors, tastes, nutritional values and the like of the dried food materials, the hot air drying energy consumption is higher, the heat efficiency is low, the freeze drying ensures the texture characteristics of the food, but the equipment cost of the technology is high, the operation cost is high, the drying time is long, the large-scale popularization and the use are not facilitated, and the flavor of the food can be changed by the freeze drying. The electrohydrodynamic drying technology (EHD) is used as an emerging drying technology, and has the advantages of good retention effect on color, nutritional ingredients, state and the like of materials, low investment, low energy consumption, no temperature rise and the like, so that the heat-sensitive materials are dried more easily to enter industrial and agricultural production, and a new way is opened up. The principle of the electrohydrodynamic drying technology is that under a high voltage field, air is driven to form stable air flow, namely 'ion wind' accelerates the evaporation speed of water, and then moisture is brought out of an oven or a drying chamber by a blower, however, most of air dehumidification of the traditional electrohydrodynamic drying device is to remove the moisture by means of a drying agent, a dehumidifying blower and the like, and the drying agent needs to be replaced regularly and the power consumption of the blower is increased, so that the cost is increased in the drying process.
For example, chinese patent publication No. CN203881052U discloses a "high voltage electric field dryer" in which moisture of the sealing device is removed by installing a moisture extraction fan, and such removal of the generated moisture by installing the moisture extraction fan has disadvantages in that power consumption of the high voltage electric field dryer is increased, resulting in high operation cost.
Disclosure of Invention
In summary, in order to overcome the defects in the prior art, the invention aims to provide a drying system of an ion wind composite membrane total heat exchanger.
The technical scheme for solving the technical problems is as follows: a drying system of an ion wind composite membrane total heat exchanger comprises a box body, an ion wind generating device and a circulating wind path; the ion wind generating device is positioned in the box body and forms ion wind so as to accelerate the evaporation speed of the water of the dried materials in the box body; the circulating air path is arranged on the outer side of the box body and communicated with the box body to enable low-temperature high-humidity air in the box body to circularly flow, and the circulating air path is also provided with a dehumidification heating device which enables the low-temperature high-humidity air in the box body to exchange heat and water molecules with the high-temperature low-humidity air outside the box body.
Based on the technical scheme, the invention can also be improved as follows:
Further, the ion wind generating device comprises an upper electrode plate and a lower electrode plate; the upper electrode plate is connected to the inner wall of the top of the box body, and the lower electrode plate is arranged at the bottom in the box body and is arranged opposite to the upper electrode plate up and down; an electrode needle is arranged on the upper electrode plate, and a dried material is placed on the lower electrode plate; the upper electrode plate is connected with a high-voltage power supply which is arranged outside the box body and is grounded through a lead, and the lower electrode plate is also grounded.
Further, the upper electrode plate is connected to the inner wall of the top of the box body through an insulating shaft.
Further, the circulating air path comprises a first air pipe, a second air pipe and a circulating fan; the two opposite side walls of the box body are respectively provided with an air inlet and an air outlet, one end of the first air pipe is connected with the air inlet of the box body, the other end of the first air pipe is connected with the air outlet of the dehumidification heating device, and the circulating fan is arranged on the first air pipe; one end of the second air pipe is connected with the air outlet of the box body, and the other end of the second air pipe is connected with the air inlet of the dehumidifying and heating device.
Further, the air inlet of the box body and the air outlet of the box body are both provided with a net cover.
Further, a flow equalizing plate is arranged at the air inlet of the box body.
Further, the air inlet of the case is located higher than the lower electrode plate.
Further, the dehumidification warming device comprises a shell, a membrane type total heat exchanger and a blower; the membrane type total heat exchanger is positioned inside the shell; two adjacent side walls of the shell are provided with an A air inlet and a C air inlet which correspond to the two inlets of the membrane type total heat exchanger, and the other two adjacent side walls are provided with a B air outlet and a D air outlet which correspond to the two outlets of the membrane type total heat exchanger; the air feeder is connected with the A air inlet to send the high-temperature low-humidity air into the membrane type total heat exchanger, the first air pipe is connected with the D air outlet, the second air pipe is connected with the C air inlet to send the low-temperature high-humidity air into the membrane type total heat exchanger and flow through the high-temperature low-humidity air in a crossing manner, and then the low-temperature high-humidity air exchanges heat and water molecules with the high-temperature low-humidity air, and then flows back into the box body from the D air outlet through the first air pipe.
And a wind outlet pipe for discharging the high-temperature low-humidity air subjected to heat and water molecule exchange is arranged on the air outlet B.
Further, the high-voltage power supply also comprises a controller for adjusting the output voltage of the high-voltage power supply, and the controller is electrically connected with the high-voltage power supply.
The membrane type total heat exchanger can adopt a 'membrane total heat exchanger runner structure' disclosed in patent number CN201141738Y to be vertically spliced with a membrane through ribs, or adopts a cross countercurrent plate type heat exchanger disclosed in patent number CN2015105254. X; the controller may adopt a "high-voltage power supply control system for an X-ray tube" disclosed in patent No. CN 201611066491.5.
The beneficial effects of the invention are as follows: the novel device for the electrohydrodynamic drying and membrane type heat exchanger is designed by combining the electrohydrodynamic drying machine and the membrane type total heat exchanger, so that the drying quality and the thermal efficiency of materials are improved, the later operation cost is reduced, the energy is saved, the environment is protected, and the market prospect is very good.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
Fig. 2 is a schematic diagram of some basic principles of an electrokinetic fluid (EHD) in a high voltage electric field.
In the drawings, the list of components represented by the various numbers is as follows:
1. The device comprises a box body, 2, a dried material, 3, an upper electrode plate, 4, a lower electrode plate, 5, an electrode needle, 6, a high-voltage power supply, 7, an insulating shaft, 8, a first air pipe, 9, a second air pipe, 10, a circulating fan, 11, a net cover, 12, a flow equalizing plate, 13, a shell, 14, a membrane type total heat exchanger, 15, a blower, 16, an air outlet pipe, 17, a controller, 18, air molecules, 19, charged particles, 20 and an ion wind direction.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, the drying system of the ion wind composite membrane total heat exchanger comprises a box body 1, an ion wind generating device and a circulating wind path. The ion wind generating device is positioned in the box body 1 and forms ion wind to accelerate the evaporation speed of the water of the dried material 2 in the box body 1. The circulating air path is arranged outside the box body 1 and communicated with the box body 1 to enable low-temperature high-humidity air in the box body 1 to circularly flow, and the circulating air path is also provided with a dehumidification heating device for enabling the low-temperature high-humidity air in the box body 1 to exchange heat and water molecules with the high-temperature low-humidity air outside the box body 1.
The ion wind generating device comprises an upper electrode plate 3 and a lower electrode plate 4. The upper electrode plate 3 is connected to the inner wall of the top of the box body 1 through an insulating shaft 7. The bottom of the lower electrode plate 4 in the box body 1 is arranged opposite to the upper electrode plate 3 up and down. Electrode needles 5 are arranged on the upper electrode plate 3, and the dried material 2 is placed on the lower electrode plate 4. The upper electrode plate 3 is connected with a high-voltage power supply 6 which is arranged outside the box body 1 and is grounded through a wire, and the lower electrode plate 4 is also grounded. The drying system further comprises a controller for regulating the output voltage of the high voltage power supply 6, said controller being electrically connected to the high voltage power supply 6. The upper electrode plate 3 is a multi-needle discharge electrode, and the lower electrode plate 4 is a grounding plate electrode. The upper electrode plate 3 and the lower electrode plate 4 are made of metal with good conductivity such as copper or aluminum, the upper electrode plate 3 is usually composed of needle electrodes (metal needles) or wire electrodes (fine metal wires), and the lower electrode plate 4 is usually composed of metal plates or metal meshes. In the drying process, the dried material is placed on the lower electrode plate 4, and then a high voltage (usually 20-50 kV) with a certain amplitude is applied to the upper electrode plate 3 through the high-voltage power supply 6, so that the upper electrode plate 3 is electrified. As shown in fig. 2, after being electrified, a high-pressure electric field can be formed between the upper electrode plate 3 and the lower electrode plate 4, and the materials are dried by utilizing the principle of the shallow Sichuan effect. After the upper electrode plate 3 is applied with high voltage, corona discharge occurs, and electrons or charged particles such as ions scattered in the air are accelerated under the action of a strong electric field to obtain enough kinetic energy, and when the charged particles collide with air molecules 18, the air molecules are dissociated into ions and electrons. These newly formed ions and electrons in turn collide with other air molecules and create new charged particles 19, which in turn create a large number of charged particles 19. Among these charged particles 19, the charged particles having a charge different from that on the tip will fly toward the tip by being attracted by the tip charge, so that the charge on the tip is neutralized; the charged particles of the same number as the tip charge will be repelled away from the tip, while driving other molecules together in a directional motion to form an ionic wind with a velocity and direction (indicated by arrow 20). When the dried material is impacted by these ion winds, the evaporation of water on the surface thereof is accelerated, resulting in an increase in the drying rate thereof.
The circulating air path comprises a first air pipe 8, a second air pipe 9 and a circulating fan 10. The two opposite side walls of the box body 1 are respectively provided with an air inlet and an air outlet, the air inlet of the box body 1 and the air outlet of the box body 1 are respectively provided with a net cover 11, and the net cover 11 is used for shielding materials and preventing the materials from entering the air inlet of the box body 1 or the air outlet of the box body 1. The air inlet of the box body 1 is also provided with the flow equalizing plate 12, the flow equalizing plate 12 can play a role in uniformly distributing air flow, and the position of the air inlet of the box body 1 is higher than that of the lower electrode plate 4, so that nonlinear interaction between ion wind and convection wind can be enhanced, and the drying effect is improved. One end of the first air pipe 8 is connected with the air inlet of the box body 1, the other end of the first air pipe is connected with the air outlet of the dehumidifying and heating device, and the circulating fan 10 is arranged on the first air pipe 8. The circulating fan 10 is provided with a flow stabilizer, and supplies air to the box body 1 through the first air pipe 8, so that evaporation of moisture of food is accelerated, and drying of the food is promoted. One end of the second air pipe 9 is connected with the air outlet of the box body 1, and the other end of the second air pipe is connected with the air inlet of the dehumidifying and heating device.
The dehumidification warming device includes a housing 13, a membrane-type total heat exchanger 14, and a blower 15. The membrane total heat exchanger 14 is located inside the housing 13. Two adjacent side walls of the shell 13 are provided with an A air inlet and a C air inlet corresponding to two inlets of the membrane type total heat exchanger 14, and the other two adjacent side walls are provided with a B air outlet and a D air outlet corresponding to two outlets of the membrane type total heat exchanger 14. The air feeder 15 is connected with the air inlet A to feed the high-temperature low-humidity air into the membrane type total heat exchanger 14, the first air pipe 8 is connected with the air outlet D, the second air pipe 9 is connected with the air inlet C to feed the low-temperature high-humidity air into the membrane type total heat exchanger 14 and cross-flow with the high-temperature low-humidity air, so that the low-temperature high-humidity air exchanges heat and water molecules with the high-temperature low-humidity air, and then flows back into the box body 1 from the air outlet D through the first air pipe 8. And an air outlet pipe 16 for discharging the high-temperature low-humidity air subjected to heat exchange and water molecule exchange is arranged on the air outlet B. The low-temperature high-humidity air in the box body 1 and the high-temperature low-humidity air outside the box body 1 respectively flow through the film type total heat exchanger 14 under the action of the circulating fan 10 and the air feeder 15, wherein the low-temperature high-humidity air and the high-temperature low-humidity air cross through the film type total heat exchanger 14, especially in summer climate, and the air outside the box body 1 is higher in temperature and lower in humidity relative to the air in the box body 1. Because the membrane type total heat exchanger 14 has temperature difference and vapor partial pressure difference at two sides of the membrane, the low-temperature high-humidity air and the high-temperature low-humidity air exchange heat and water molecules at two sides of the membrane type total heat exchanger 14, so that the humidity of the air in the box body 1 is reduced and the temperature is increased, the humidity in the high-humidity air in the box body 1 is transferred to the low-humidity air outside the box body 1, and the aim of dehumidifying the box body 1 is fulfilled. Compared with the existing drying technology, the drying system has the characteristics of high drying speed, good drying quality, low later operation cost, energy conservation, environmental protection and the like, and the ion wind generating device, the circulating fan 10, the membrane type total heat exchanger 14 and the like formed in the box body 1 form an integral circulating system through the air pipes, so that the drying speed is increased, the flavor of food is improved, and the drying effect is better. The power consumption part mainly comprises the high-voltage power supply 6, the circulating fan 10 and the blower 15, so that the later operation cost is reduced, and the energy-saving and environment-friendly effects are realized.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (7)

1. The drying system of the ion wind composite membrane total heat exchanger is characterized by comprising a box body (1), an ion wind generating device and a circulating wind path; the ion wind generating device is positioned in the box body (1) and forms ion wind to accelerate the evaporation speed of water of the dried material (2) in the box body (1); the circulating air path is arranged outside the box body (1) and communicated with the box body (1) to enable low-temperature high-humidity air in the box body (1) to circularly flow, and a dehumidification and temperature rise device which enables the low-temperature high-humidity air in the box body (1) to exchange heat and water molecules with the high-temperature low-humidity air outside the box body (1) is further arranged on the circulating air path;
The circulating air path comprises a first air pipe (8), a second air pipe (9) and a circulating fan (10); an air inlet and an air outlet are respectively arranged on two opposite side walls of the box body (1), one end of the first air pipe (8) is connected with the air inlet of the box body (1), the other end of the first air pipe is connected with the air outlet of the dehumidification heating device, and the circulating fan (10) is arranged on the first air pipe (8); one end of the second air pipe (9) is connected with an air outlet of the box body (1), and the other end of the second air pipe is connected with an air inlet of the dehumidification heating device;
The dehumidification heating device comprises a shell (13), a membrane type total heat exchanger (14) and a blower (15); the membrane total heat exchanger (14) is located inside the housing (13); two adjacent side walls of the shell (13) are provided with an A air inlet and a C air inlet which correspond to two inlets of the membrane type total heat exchanger (14), and the other two adjacent side walls are provided with a B air outlet and a D air outlet which correspond to two outlets of the membrane type total heat exchanger (14); the air feeder (15) is connected with the air inlet A to feed the high-temperature low-humidity air into the membrane type total heat exchanger (14), the first air pipe (8) is connected with the air outlet D, the second air pipe (9) is connected with the air inlet C to feed the low-temperature high-humidity air into the membrane type total heat exchanger (14) and flow through the air inlet C in a cross manner with the high-temperature low-humidity air, so that the low-temperature high-humidity air exchanges heat and water molecules with the high-temperature low-humidity air, and then the low-temperature high-humidity air flows back into the box body (1) from the air outlet D through the first air pipe (8);
The air inlet of the box body (1) and the air outlet of the box body (1) are both provided with a net cover (11).
2. The drying system of the ion wind composite membrane total heat exchanger according to claim 1, wherein the ion wind generating device comprises an upper electrode plate (3) and a lower electrode plate (4); the upper electrode plate (3) is connected to the inner wall of the top of the box body (1), and the bottom of the lower electrode plate (4) in the box body (1) is opposite to the upper electrode plate (3) up and down; an electrode needle (5) is arranged on the upper electrode plate (3), and a material (2) to be dried is placed on the lower electrode plate (4); the upper electrode plate (3) is connected with a high-voltage power supply (6) which is arranged outside the box body (1) and is grounded through a wire, and the lower electrode plate (4) is also grounded.
3. The drying system of the ion wind composite membrane total heat exchanger according to claim 2, wherein the air inlet of the box body (1) is positioned higher than the lower electrode plate (4).
4. The drying system of an ion wind composite membrane total heat exchanger according to claim 2, further comprising a controller for regulating the output voltage of the high voltage power supply (6), the controller being electrically connected to the high voltage power supply (6).
5. The drying system of the ion wind composite membrane total heat exchanger according to claim 2, wherein the upper electrode plate (3) is connected to the inner wall of the top of the box body (1) through an insulating shaft (7).
6. The drying system of the ion wind composite membrane total heat exchanger according to claim 1, wherein a flow equalizing plate (12) is installed at the air inlet of the box body (1).
7. The drying system of the ion wind composite membrane total heat exchanger according to claim 1, wherein an air outlet pipe (16) for discharging the high-temperature low-humidity air after heat exchange and water molecule exchange is arranged on the air outlet of the B.
CN201910048860.5A 2019-01-18 2019-01-18 Drying system of ion wind composite film total heat exchanger Active CN109708439B (en)

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CN110981155B (en) * 2019-12-19 2021-04-13 西安交通大学 Sludge drying system and drying method based on ion wind
CN113654306A (en) * 2021-07-28 2021-11-16 南京工业大学 Solar pulse power supply driving magnetic field coupling high-voltage electric field drying device
CN117870332A (en) * 2023-03-06 2024-04-12 仁善田园(广东)农业科技发展有限公司 Automatic drying equipment of chinese herbal medicine
CN116793892A (en) * 2023-08-29 2023-09-22 东莞松山湖国际机器人研究院有限公司 High-voltage electric field drying rate calculation method based on gravity sensor

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