Steam type hot air circulation dryer

Abstract

The utility model discloses a steam type hot air circulation dryer, which belongs to the field of edible mushroom processing and comprises a hot air channel, a drying cavity and a heat exchange cavity which are arranged in a dryer body, and a heat exchange device is arranged in the heat exchange cavity. The heat exchange device comprises a plate heat exchanger, a steam energy saver and a hydrophilic aluminum foil core, the plate heat exchanger is located on a flowing path of airflow from the heat exchange cavity to the hot air channel, and the steam energy saver is located on a flowing path of airflow from the circulating air outlet to the heat exchange cavity. When the steam type hot air circulation drying machine operates, outside air is preheated through the hydrophilic aluminum foil core of the heat exchange cavity and heated through the plate heat exchanger to form high-temperature hot air which is used for drying fresh mushrooms, and the hot air circulation drying machine can be used for drying fresh mushrooms. Circulating air is heated again through the steam energy saver and then subjected to heat exchange and dehumidification strengthening on the hydrophilic aluminum foil core together with fresh air, energy is saved through circulating air, cost is reduced, and the drying efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of edible fungi processing technology, and in particular to a steam-type hot air circulating dryer. Background Technology

[0002] Edible fungi are mostly fleshy, crisp, tender, and delicious, rich in nutrients. Regular consumption can help prevent high blood lipids and high cholesterol, and has the effects of preventing cardiovascular diseases and enhancing the body's immunity. Therefore, edible fungi have a good market demand and promising future, and have become an emerging industry. In the daily production and processing of edible fungi, cleaning is necessary to remove impurities and dust from the surface. After cleaning, they need to be dehydrated at low temperatures and dried before being packaged. Currently, the traditional method is natural air drying, but edible fungi have a high water content, making natural air drying slow and affecting processing efficiency. Furthermore, imported equipment is expensive, increasing production costs.

[0003] A current patent, CN108125262A, discloses a low-temperature dehydration device for edible fungi, comprising a casing, a humid air inlet, a dry air outlet, a control box, and a compressor. Its features include: a manual damper, a centrifugal fan, an internal condenser, a heat exchanger, and an evaporator installed inside the casing; an external condenser installed outside the casing; the heat exchanger positioned between the internal condenser and the evaporator, installed at an angle of 80° to the horizontal plane; the centrifugal fan located at the dry air outlet; and the internal condenser welded to the centrifugal fan. This low-temperature dehydration device for edible fungi operates through a circulation mechanism, continuously blowing out low-temperature, dry air via the centrifugal fan, achieving the effect of low-temperature dehydration of edible fungi indoors. It boasts high efficiency and is cheaper than imported devices, reducing production costs.

[0004] The existing publicly available technologies can only dehumidify the humid air drawn in from the inlet, but cannot effectively treat the circulating gas carrying water vapor. The resulting dry hot air is discharged directly, which cannot solve the problem of energy recycling. Utility Model Content

[0005] The purpose of this invention is to provide a steam-type hot air circulating dryer. Existing technologies cannot effectively treat circulating gas carrying water vapor, and can only discharge the air directly through the outlet, which cannot form an energy recycling system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a steam-type hot air circulating dryer, comprising a dryer body, a hot air channel, a drying chamber, a heat exchange chamber, and an air inlet and an air outlet communicating with the outside. The drying chamber has a circulating air inlet communicating with the hot air channel and a circulating air outlet communicating with the heat exchange chamber. The heat exchange chamber is also communicating with the air inlet, the air outlet, and the hot air channel. A heat exchange device is provided in the heat exchange chamber, comprising a plate heat exchanger, a steam energy saver, and a hydrophilic aluminum foil core. The plate heat exchanger is located on the flow path of the airflow from the heat exchange chamber to the hot air channel. The steam energy saver is located on the flow path of the airflow from the circulating air outlet to the heat exchange chamber. The hydrophilic aluminum foil core is located on the flow path of the airflow from the air inlet to the hot air channel and from the circulating air outlet to the air outlet.

[0007] Furthermore, the heat exchange chamber includes a heat exchanger housing, an air inlet chamber, an exhaust chamber, a first heating chamber, and a second heating chamber. The hydrophilic aluminum foil core is located within the heat exchanger housing. The air inlet chamber is connected to the air inlet, the exhaust chamber is connected to the air outlet, the first heating chamber is connected to the hot air channel, the plate heat exchanger is located within the first heating chamber, the second heating chamber is connected to the circulating air outlet, and the steam energy saver is located within the second heating chamber.

[0008] Furthermore, the hot air channel is located above the drying chamber and extends along the length of the drying chamber, communicating with the circulating air inlet.

[0009] Furthermore, the plate heat exchanger is connected to the steam economizer.

[0010] Furthermore, the circulating air inlet and the circulating air outlet of the drying chamber are both provided with porous permeable steel plates, and the circulating air inlet is also provided with a high-temperature circulating fan.

[0011] Furthermore, a return air channel is provided between the air inlet and the air outlet.

[0012] Furthermore, the air inlet is equipped with a blower, and a polyester filter screen is provided on the outside of the blower.

[0013] Furthermore, the drying chamber is also provided with an inlet channel and an outlet channel that communicate with the outside. The inlet channel is located on the side of the drying chamber near the circulating air outlet, and the outlet channel is located on the side near the circulating air inlet.

[0014] Furthermore, both the feeding channel and the discharging channel are equipped with movable sliding doors.

[0015] Furthermore, the dryer body is also provided with a drainage trough, which is located below the hydrophilic aluminum foil core and has a drainage outlet that connects to the outside.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model innovatively sets up a heat exchange cavity and installs a heat exchange device inside the heat exchange cavity, which effectively solves the problem in the prior art that it is impossible to effectively process circulating gas carrying water vapor and that it is difficult to achieve gas reuse with high energy consumption.

[0018] When this steam-type hot air circulating dryer is running, outside air enters the heat exchange chamber through the air inlet. It first passes through the hydrophilic aluminum foil core, where the heat exchange performance is used to preheat the fresh air. Then, it passes through the plate heat exchanger for further heating, thus forming high-temperature hot air. The high-temperature hot air is stably and evenly transported from the upper hot air channel to the lower drying chamber, acting on the edible mushrooms to be dried, ensuring the high efficiency and uniformity of the drying process. After the hot air circulates through the drying chamber, although the temperature of the hot air decreases, the low-temperature circulating air, after being discharged from the circulating air outlet of the drying chamber through the heat exchange device and the gas flow path designed in this invention, re-enters the steam energy saver. The waste heat transferred from the plate air exchanger by the steam energy saver reheats the circulating air flowing out of the drying chamber and blows it back onto the hydrophilic aluminum foil core. During this process, the heated circulating air and the newly added fresh air form a large temperature difference on the hydrophilic aluminum foil core. This temperature difference not only greatly enhances the heat exchange effect, but also, based on the principle of temperature difference, makes it easier for water vapor in the air to reach the dew point and condense on the surface of the hydrophilic aluminum foil core. This successfully achieves the preheating of the fresh air and the simultaneous dehumidification of the circulating air and the fresh air, significantly improving the drying effect and drying speed.

[0019] Most importantly, thanks to the processing of the circulating air humidity, the humidity of the circulating air is reduced to the expected value, and the return air can be reintroduced into the hot air channel for recycling through the first heating chamber, which fully realizes the multiple recycling of energy and greatly reduces the unnecessary waste of energy and drying costs.

[0020] This invention ensures that the drying chamber is always kept in a suitable humidity and temperature environment, guaranteeing the stability and reliability of the drying operation. It provides strong support for the continuous and efficient drying of large quantities of fresh edible fungi, making the steam-type hot air circulating dryer of this invention have broad application prospects and significant economic value in the field of edible fungi processing. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1This is a schematic diagram of the internal structure of a steam-type hot air circulating dryer according to the present invention.

[0023] In the diagram: 1. Dryer body, 11. Hot air duct, 12. Drying chamber, 121. Circulating air inlet, 122. Circulating air outlet, 123. Feeding channel, 124. Discharge channel, 125. Sliding door, 13. Heat exchange chamber, 131. Heat exchanger housing, 132. Air inlet, 133. Exhaust chamber, 134. First heating chamber, 135. Second heating chamber, 14. Air inlet, 141. Blower, 142. Polyester filter screen, 15. Exhaust outlet, 16. Return air duct, 2. Heat exchange device, 21. Plate heat exchanger, 22. Steam economizer, 23. Hydrophilic aluminum foil core, 3. Perforated breathable steel plate, 4. High-temperature circulating fan, 6. Drainage trough, 61. Drain outlet. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0025] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0026] like Figure 1As shown, this utility model provides a steam-type hot air circulating dryer, including a dryer body 1, a hot air channel 11, a drying chamber 12, a heat exchange chamber 13, and an air inlet 14 and an air outlet 15 communicating with the outside. The heat exchange chamber 13 and the drying chamber 12 are arranged along the length of the dryer body 1. A circulating air outlet 122 is provided on the side of the drying chamber 12 near the heat exchange chamber 13, and a circulating air inlet 121 is provided on the other side opposite to the circulating air outlet 122. The hot air duct is arranged along the length of the drying chamber 12, with the front end... The dryer body 1 is connected to the heat exchange chamber 13, and its tail end is connected to the circulating air inlet 121. The air inlet 14 of the dryer body 1 is located below the dryer body 1, and the exhaust outlet 15 is located above on the same side. Both the air inlet 14 and the exhaust outlet 15 are connected to the heat exchange chamber 13. A heat exchange device 2 is installed inside the heat exchange chamber 13. The heat exchange device 2 includes a plate heat exchanger 21, a steam economizer 22, and a hydrophilic aluminum foil core 23. The plate heat exchanger 21 is connected to the factory's heat pipes. The plate heat exchanger 21 mainly exchanges heat through plates. It has many... Thin metal plates are pressed into various corrugated shapes to increase the heat exchange area and enhance the turbulence of the fluid. Two fluids at different temperatures flow on opposite sides of the plates. The high-temperature fluid transfers heat to the low-temperature fluid through the plates, thus achieving heat exchange. The steam economizer 22 is connected to the plate heat exchanger 21 via a pipe, and the waste heat energy of the plate heat exchanger 21 is transferred to the steam economizer 22. The hydrophilic aluminum foil core 23 is rectangular and formed by stacking multiple aluminum foil plates with spacing. The hydrophilic aluminum foil core 23 has a passage in the middle that allows airflow. The plate heat exchanger 21 is located on the flow path of airflow from the heat exchange chamber 13 to the hot air channel 11, and faces the gas flow channel on the hydrophilic aluminum foil core 23. The steam energy saver 22 is located on the flow path of airflow from the circulation outlet 122 to the heat exchange chamber 13, and also faces the gas flow channel on the hydrophilic aluminum foil core 23. The hydrophilic aluminum foil core 23 is located on the flow path of airflow from the air inlet 14 to the hot air channel 11 and from the circulation outlet 122 to the exhaust outlet 15.

[0027] In this invention, the airflow path is as follows: Outside air first enters the heat exchange chamber 13 through the air inlet 14, which connects to the outside. Inside the heat exchange chamber 13, the air first passes through the hydrophilic aluminum foil core 23, where it undergoes preliminary heat exchange with the treated circulating air, achieving initial preheating of the fresh air. Then, it passes through the plate heat exchanger 21, where the air is further heated to form high-temperature hot air. This high-temperature hot air flows evenly from the upper hot air channel 11 to the lower drying chamber 12, drying the edible mushrooms placed inside. During this process, the hot air carries away the moisture from the mushrooms, gradually lowering its own temperature to form lower-temperature circulating air. The cooled circulating air is then discharged from the circulating air outlet 122 of the drying chamber 12 and enters the steam energy-saving device 22. The steam energy saver 22 uses waste heat to raise the temperature of the circulating air again. Then, the heated circulating air is blown back onto the hydrophilic aluminum foil core 23, forming a large temperature difference with the newly entered fresh air, and performing heat exchange and dehumidification. At the same time, this utility model can detect the humidity in the heat exchange chamber 13 according to the humidity detection system in the heat exchange chamber 13. If the humidity in the heat exchange chamber 13 meets the expected value, the circulating air and fresh air return to the hot air channel 11 through the first heating chamber 134 for continued circulation. If the humidity is too high, the return air volume can be controlled by the return air valve, or even the return air channel 16 can be closed to discharge all the humid air from the exhaust port 15, so as to maintain a suitable humidity and temperature environment in the drying chamber 12 and ensure the efficient and stable operation of the drying operation.

[0028] Through the heat exchange device 2 designed in this utility model and the gas flow path in this utility model, the low-temperature circulating air is discharged from the circulating air outlet 122 of the drying chamber 12 and re-enters the steam energy saver 22. The waste heat transferred from the plate heat exchanger 21 by the steam energy saver 22 reheats the circulating air flowing out of the drying chamber 12 and blows it back onto the hydrophilic aluminum foil core 23. In this process, the heated circulating air and the newly added fresh air form a large temperature difference on the hydrophilic aluminum foil core 23. This temperature difference not only greatly enhances the heat exchange effect, but also, based on the principle of temperature difference, the water vapor in the air is more likely to reach the dew point and condense on the surface of the hydrophilic aluminum foil core 23. This successfully achieves the preheating of the fresh air and the simultaneous dehumidification of the circulating air and the fresh air, significantly improving the drying effect and drying speed.

[0029] Most importantly, thanks to the processing of the circulating air humidity, the humidity of the circulating air is reduced to the expected value, and the return air can be reintroduced into the hot air channel 11 through the first heating chamber 134 for recycling, which fully realizes the multiple recycling of energy and greatly reduces the unnecessary waste of energy and drying costs.

[0030] This invention solves the problem in the prior art that it is impossible to effectively treat circulating gas carrying water vapor, and that only independent direct discharge through the air inlet and outlet can be carried out, thus failing to form an energy recycling system.

[0031] The heat exchange chamber 13 includes a heat exchanger housing 131, an air inlet chamber 132, an exhaust chamber 133, a first heating chamber 134, and a second heating chamber 135. The hydrophilic aluminum foil core 23 is located within the heat exchanger housing 131. The air inlet chamber 132 is connected to the air inlet 14, and the exhaust chamber 133 is connected to the air outlet 15. The first heating chamber 134 is connected to the hot air channel 11. The plate heat exchanger 21 is located within the first heating chamber 134, and the second heating chamber 135 is connected to the circulating air outlet 122. The steam energy saver 22 is located within the second heating chamber 135. The four chambers of the heat exchange chamber 13 are separated by partitions and are also interconnected through the hydrophilic aluminum foil core 23. This achieves a stable airflow path between the four chambers, preventing chaotic airflow within the air exchange chamber and thus avoiding poor heat exchange performance.

[0032] The hot air channel 11 is located above the drying chamber 12 and extends along the length of the drying chamber 12 to communicate with the circulating air inlet 121; ensuring that the edible fungi in the drying chamber 12 can be dried.

[0033] Both the circulating air inlet 121 and the circulating air outlet 122 of the drying chamber 12 are provided with porous breathable steel plates 3, and the circulating air inlet 121 is also provided with a high-temperature circulating fan 4; to ensure that the drying chamber 12, the heat exchange chamber 13 and the hot steam channel can be connected to form a complete air flow path, and the high-temperature circulating fan 4 is used to circulate the gas in the entire dryer body 1.

[0034] The air inlet 14 is equipped with a blower 141, and a polyester filter screen 142 is provided on the outside of the blower 141. The blower 141 is used to draw outside air into the heat exchange wall, and the polyester filter screen 142 on the outside is used to filter impurities and dust, ensuring that the air inside the entire steam hot air circulation dryer remains clean, avoiding contamination of the dried edible fungi, and ensuring food safety.

[0035] Furthermore, the steam-type hot air circulating dryer of this utility model has a drying chamber 12 with a feeding channel 123 and a discharging channel 124. The feeding channel 123 is located near the side of the drying chamber 12 close to the circulating air outlet 122, and the discharging channel 124 is located near the side of the circulating air inlet 121. Compared with traditional drying equipment, which uses a shared opening for both the feeding and discharging ports, this utility model's design allows materials to enter the entire vehicle from the feeding port and be pulled out of the entire vehicle from the discharging port. This is more labor-saving than traditional drying methods, as it allows for the entire vehicle to enter and exit, avoiding the need for stacking trays one by one and constantly changing drying positions. The same labor force can greatly increase the daily drying capacity.

[0036] Both the feeding channel 123 and the discharging channel 124 are equipped with movable sliding doors 125, which ensures the sealing of the drying chamber 12 and improves the drying effect and efficiency.

[0037] The dryer body 1 is also equipped with a drainage trough 6, which is located below the hydrophilic aluminum foil core 23. The drainage trough 6 has a drain outlet 61 that connects to the outside. The hydrophilic aluminum foil core 23 of this invention is positioned with its two apexes facing the drainage trough 6. This placement method greatly optimizes the sliding path and efficiency of water droplets. Firstly, this inclined placement angle allows the water droplets condensed on the hydrophilic aluminum foil core 23 to slide quickly along a specific direction under the action of gravity. Compared to horizontal or random placement, its sliding speed is significantly increased. This improvement effectively reduces the residence time of water droplets on the aluminum foil core surface, thus avoiding the problem of reduced heat exchange efficiency that may be caused by prolonged water droplet adhesion, ensuring the efficient and stable operation of the entire drying system. Moreover, the concentrated droplet falling position is a major highlight. The concentrated droplets can fall accurately into the drainage trough 6 below, avoiding the scattered distribution of water droplets inside the dryer body 1. This prevents problems such as equipment dampness and rust that may be caused by water droplet residue, extends the service life of the equipment, and reduces equipment maintenance costs and failure risks.

[0038] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A steam-type hot air circulating dryer, comprising a dryer body, wherein the dryer body is provided with a hot air channel, a drying chamber, a heat exchange chamber, and an air inlet and an air outlet communicating with the outside, characterized in that, The drying chamber has a circulating air inlet communicating with the hot air channel and a circulating air outlet communicating with the heat exchange chamber. The heat exchange chamber is also communicating with the air inlet, the air outlet, and the hot air channel. A heat exchange device is provided inside the heat exchange chamber. The heat exchange device includes a plate heat exchanger, a steam economizer, and a hydrophilic aluminum foil core. The plate heat exchanger is located on the flow path of the airflow from the heat exchange chamber to the hot air channel. The steam economizer is located on the flow path of the airflow from the circulating air outlet to the heat exchange chamber. The hydrophilic aluminum foil core is located on the flow path of the airflow from the air inlet to the hot air channel and from the circulating air outlet to the air outlet.

2. The steam-type hot air circulating dryer according to claim 1, characterized in that, The heat exchange chamber includes a heat exchanger housing, an air inlet chamber, an exhaust chamber, a first heating chamber, and a second heating chamber. The hydrophilic aluminum foil core is located within the heat exchanger housing. The air inlet chamber is connected to the air inlet, the exhaust chamber is connected to the air outlet, the first heating chamber is connected to the hot air channel, the plate heat exchanger is located within the first heating chamber, the second heating chamber is connected to the circulating air outlet, and the steam energy saver is located within the second heating chamber.

3. The steam-type hot air circulating dryer according to claim 1, characterized in that, The hot air channel is located above the drying chamber and extends along the length of the drying chamber, communicating with the circulating air inlet.

4. A steam-type hot air circulating dryer according to claim 1, characterized in that, The plate heat exchanger is connected to the steam economizer.

5. A steam-type hot air circulating dryer according to claim 1, characterized in that, The drying chamber is equipped with a porous steel plate on both the circulating air inlet and the circulating air outlet, and a high-temperature circulating fan is also provided on the circulating air inlet.

6. A steam-type hot air circulating dryer according to claim 1, characterized in that, A return air channel is also provided between the air inlet and the air outlet.

7. A steam-type hot air circulating dryer according to claim 1, characterized in that, The air inlet is equipped with a blower, and a polyester filter screen is provided on the outside of the blower.

8. A steam-type hot air circulating dryer according to claim 1, characterized in that, The drying chamber is also provided with an inlet channel and an outlet channel that connect to the outside. The inlet channel is located on the side of the drying chamber near the circulating air outlet, and the outlet channel is located on the side near the circulating air inlet.

9. A steam-type hot air circulating dryer according to claim 8, characterized in that, Both the feeding channel and the discharging channel are equipped with movable sliding doors.

10. A steam-type hot air circulating dryer according to claim 1, characterized in that, The dryer body is also provided with a drainage trough, which is located below the hydrophilic aluminum foil core and has a drainage outlet that connects to the outside.

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