Steam type hot air circulation dryer

Abstract

The invention discloses a steam type hot air circulation dryer, and belongs to the field of edible mushroom processing, and the steam type hot air circulation dryer comprises a hot air channel, a drying cavity and a heat exchange cavity which are arranged in a dryer body, 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 has the advantages that the heat exchange efficiency is improved; 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] The invention relates to the technical field of edible fungus processing, in particular to a steam-type hot air circulation drying machine. Background Art

[0002] Most edible fungi are fleshy, tender, delicious, and rich in nutrition. Regular consumption can prevent high blood fat and high cholesterol, prevent cardiovascular diseases, and enhance the body's immunity. It can be seen that edible fungi have a good market demand and prospect, and have become an emerging industry. In the daily production and processing of edible fungi, it is necessary to clean the edible fungi. Cleaning is to remove impurities and dust on the surface of the edible fungi. After cleaning, they must be dehydrated at low temperature and dried before they can be bagged for packaging. In the prior art, the traditional method is natural air drying, but the edible fungi have strong water content and high water content, and the natural air drying speed is slow, which affects the processing efficiency of the edible fungi. In addition, the imported equipment cost is relatively expensive, which increases the production cost.

[0003] The existing disclosure is CN108125262A, which discloses a low-temperature dehydration device for edible fungi, including a chassis, a wet air inlet, a dry air outlet, a control box, and a compressor, characterized in that: a manual damper, a centrifugal fan, an internal condenser, a heat exchanger, and an evaporator are arranged inside the box, and an external condenser is arranged outside the box. The heat exchanger is arranged between the internal condenser and the evaporator, and is installed obliquely. From the perspective of observation, the angle between the heat exchanger and the horizontal plane is 80°. The centrifugal fan is arranged at the dry air outlet, and the internal condenser is welded and installed close to the centrifugal fan. The low-temperature dehydration device for edible fungi works in a circulation mode, and continuously blows out low-temperature dry air through the centrifugal fan, which has the effect of low-temperature dehydration of indoor edible fungi, has high working efficiency, is cheaper than imported devices, and has reduced production costs.

[0004] The existing public technology can only dehumidify the moist air sucked in by the inlet, but cannot effectively treat the circulating gas carrying water vapor. The dry hot air formed is discharged directly, which cannot solve the problem of energy recycling. Summary of the invention

[0005] The purpose of the present invention is to provide a steam-type hot air circulation dryer. The existing technology cannot effectively treat the circulating gas carrying water vapor, and can only directly discharge the air from the outlet independently, which cannot form the problem of energy recycling.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a steam-type hot air circulation dryer comprises a drying body, a hot air channel is arranged in the drying body, a drying chamber, a heat exchange chamber and an air inlet and an exhaust port connected to the outside, the drying chamber has a circulating air inlet connected to the hot air channel and a circulating air outlet connected to the heat exchange chamber, the heat exchange chamber is also connected to the air inlet, the exhaust port and the hot air channel, a heat exchange device is arranged in the heat exchange chamber, the heat exchange device comprises 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 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, and 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 exhaust port.

[0007] Furthermore, the heat exchange chamber includes a heat exchanger accommodating chamber, an air inlet chamber, an exhaust chamber, a first heating chamber and a second heating chamber, the hydrophilic aluminum foil core is located in the heat exchanger accommodating chamber, the air inlet chamber is connected to the air inlet, the exhaust chamber is connected to the exhaust port, the first heating chamber is connected to the hot air channel, the plate heat exchanger is located in the first heating chamber, the second heating chamber is connected to the circulating air outlet, and the steam economizer is located in the second heating chamber.

[0008] Furthermore, the hot air channel is located above the drying chamber, and extends along the length direction of the drying chamber to communicate 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 breathable 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 provided with an air blower, and a polyester filter is provided on the outer side of the air blower.

[0013] Furthermore, the drying chamber is also provided with a feed channel and a discharge channel connected to the outside, the feed channel is located close to a side of the drying chamber close to the circulating air outlet, and the discharge channel is located close to a side of the circulating air inlet.

[0014] Furthermore, both the feed channel and the discharge channel are provided with movable sliding doors.

[0015] Furthermore, a drainage groove is provided in the drying machine body, and the drainage groove is located below the hydrophilic aluminum foil core, and the drainage groove has a drainage port connected to the outside.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention innovatively arranges a heat exchange chamber and a heat exchange device in the heat exchange chamber, which effectively solves the problem in the prior art that circulating gas carrying water vapor cannot be effectively treated, gas reuse is difficult, and energy consumption is high.

[0018] When the steam-type hot air circulation dryer is in operation, the outside air enters the heat exchange chamber from the air inlet, first passes through the hydrophilic aluminum foil core, and uses the heat exchange performance to preheat the fresh air, and then passes through the plate heat exchanger to further heat it, thereby 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 fresh edible fungi to be dried, ensuring the efficiency and uniformity of the drying process. After the hot temperature circulates through the drying chamber, although the temperature of the hot air decreases, through the heat exchange device designed in the present invention and the gas flow path of the gas in the present invention, the circulating air with low temperature is discharged from the circulating air outlet of the drying chamber and enters the steam economizer again. The steam economizer uses the waste heat transmitted from the plate ventilator to heat the circulating air flowing out of the drying chamber again and blow it back onto the hydrophilic aluminum foil core. In this process, a large temperature difference is formed on the hydrophilic aluminum foil core between the heated circulating air and the newly added fresh air. This temperature difference not only greatly enhances the heat exchange effect, but also based on the temperature difference principle, 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, thereby successfully realizing the preheating of the fresh air and the synchronous dehumidification of the circulating air and the fresh air, and significantly improving the drying effect and drying speed.

[0019] What is particularly important is that, thanks to the treatment 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 through the first heating chamber for recycling, fully realizing the multiple recycling of energy and greatly reducing the unnecessary waste of energy and drying costs.

[0020] The present invention ensures that the drying chamber is always maintained at an appropriate humidity and temperature environment, ensures the stability and reliability of the drying operation, provides strong support for continuous and efficient drying of a large number of fresh edible fungi, and makes the steam-type hot air circulation dryer of the present invention have broad application prospects and significant economic value in the fields of edible fungi processing and the like. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1The present invention is a schematic diagram of the internal structure of a steam-type hot air circulation drying machine.

[0023] In the figure: 1 drying body, 11 hot air channel, 12 drying chamber, 121 circulating air inlet, 122 circulating air outlet, 123 feeding channel, 124 discharging channel, 125 movable sliding door, 13 heat exchange chamber, 131 heat exchanger accommodating chamber, 132 air inlet chamber, 133 exhaust chamber, 134 first heating chamber, 135 second heating chamber, 14 air inlet, 141 blower, 142 polyester filter, 15 exhaust outlet, 16 return air channel, 2 heat exchange device, 21 plate heat exchanger, 22 steam economizer, 23 hydrophilic aluminum foil core, 3 porous breathable steel plate, 4 high temperature circulating fan, 6 drainage trough, 61 drainage outlet. DETAILED DESCRIPTION

[0024] 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 only part of the embodiments of the present invention, rather than all the embodiments.

[0025] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0026] like Figure 1As shown, the present invention provides a steam-type hot air circulation dryer, comprising a drying machine body 1, a hot air channel 11, a drying chamber 12, a heat exchange chamber 13, an air inlet 14 and an air outlet 15 connected to the outside, the heat exchange chamber 13 and the drying chamber 12 are arranged along the length direction of the drying machine body 1, a circulation air outlet 122 is arranged on one side of the drying chamber 12 close to the heat exchange chamber 13, and a circulation air inlet 121 is arranged on the other side opposite to the circulation air outlet 122, the hot air duct is arranged along the length direction of the drying chamber 12, and the front end is connected to the heat exchange chamber 13. The heat exchange chamber 13 is connected, and the tail end is connected to the circulating air inlet 121. At the same time, the air inlet 14 of the drying machine body 1 is arranged at the bottom of the drying machine body 1, and the air outlet 15 is arranged at the top of the same side, and the air inlet 14 and the air outlet 15 are both connected to the heat exchange chamber 13. A heat exchange device 2 is arranged in 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 with the heat energy pipeline in the factory. 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 of different temperatures flow on both sides of the plate, and the high-temperature fluid transfers heat to the low-temperature fluid through the plate, thereby realizing heat exchange. The steam economizer 22 is connected to the plate heat exchanger 21 through a pipeline, and the waste heat of the plate heat exchanger 21 is transferred to the steam economizer 22. The hydrophilic aluminum foil core 23 is a rectangular body, which is formed by stacking a plurality of aluminum foil plates. There is a passage in the middle of the hydrophilic aluminum foil core 23 for airflow. The plate heat exchanger 21 is located on the flow path of the airflow from the heat exchange chamber 13 to the hot air channel 11, and is positively directed toward the gas flow channel on the hydrophilic aluminum foil core 23. The steam economizer 22 is located on the flow path of the airflow from the circulating air outlet 122 to the heat exchange chamber 13, and also remains positively directed toward the gas flow channel on the hydrophilic aluminum foil core 23. The hydrophilic aluminum foil core 23 is located on the flow path of the airflow from the air inlet 14 to the hot air channel 11 and from the circulating air outlet 122 to the exhaust port 15.

[0027] The air flow path of the present invention is that the outside air first enters the heat exchange chamber 13 from the air inlet 14 connected to the outside. In the heat exchange chamber 13, the air first passes through the hydrophilic aluminum foil core 23, and performs preliminary heat exchange with the treated circulating air to achieve preliminary preheating of the fresh air. Then, the air passes through the plate heat exchanger 21, and the air is further heated to form high-temperature hot air; the high-temperature hot air flows evenly from the upper hot air channel 11 to the lower drying chamber 12, and the fresh edible fungi placed in the drying chamber 12 are dried. In this process, the hot air takes away the moisture in the fresh mushrooms, and its own temperature gradually decreases, forming a circulating air with a lower temperature; the circulating air with the lowered temperature is discharged from the circulating air outlet 122 of the drying chamber 12 and enters the steam economizer 22. The steam economizer 22 uses the waste heat to raise the temperature of the circulating air again. After that, 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, the present invention 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 the fresh air return to the hot air channel 11 through the first heating chamber 134 to continue to be circulated. 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 progress of the drying operation.

[0028] Through the heat exchange device 2 designed in the present invention and the gas flow path of the gas in the present invention, the circulating air with low temperature is discharged from the circulating air outlet 122 of the drying chamber 12 and enters the steam economizer 22 again. The steam economizer 22 uses the waste heat transmitted from the plate heat exchanger 21 to heat up the circulating air flowing out of the drying chamber 12 again, and blows it back onto the hydrophilic aluminum foil core 23. In this process, a large temperature difference is formed between the heated circulating air and the newly added fresh air on the hydrophilic aluminum foil core 23. This temperature difference not only greatly enhances the heat exchange effect, but also based on the temperature difference principle, 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, thereby successfully realizing the preheating of the fresh air and the synchronous dehumidification of the circulating air and the fresh air, and significantly improving the drying effect and drying speed.

[0029] What is particularly important is that, thanks to the treatment 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, fully realizing the multiple recycling of energy and greatly reducing the unnecessary waste of energy and drying costs.

[0030] The present invention solves the problem in the prior art that circulating gas carrying water vapor cannot be effectively treated and can only be discharged directly from the air inlet and outlet independently, and energy recycling cannot be achieved.

[0031] The heat exchange chamber 13 includes a heat exchanger accommodating chamber 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 in the heat exchanger accommodating chamber 131, the air inlet chamber 132 is connected to the air inlet 14, the exhaust chamber 133 is connected to the exhaust port 15, the first heating chamber 134 is connected to the hot air channel 11, the plate heat exchanger 21 is located in the first heating chamber 134, the second heating chamber 135 is connected to the circulating air outlet 122, and the steam economizer 22 is located in the second heating chamber 135; partitions are provided between the four chambers of the heat exchange chamber 13, and are separated by the hydrophilic aluminum foil core 23, and are connected to each other through the hydrophilic aluminum foil core 23, so that the four chambers form a stable airflow path, avoiding airflow chaos in the ventilation chamber, resulting in poor heat exchange effect on the airflow.

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

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

[0034] The air inlet 14 is provided with an air blower 141, and a polyester filter 142 is provided on the outside of the air blower 141; the air blower 141 is used to draw outside air into the heat exchange wall, and the polyester filter 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] Again, the steam-type hot air circulation dryer of the present invention has a drying chamber 12 designed with a feed channel 123 and a discharge channel 124. The feed channel 123 is located close to the side of the drying chamber 12 close to the circulating air outlet 122, and the discharge channel 124 is located close to the side of the circulating air inlet 121. Compared with traditional drying equipment, whose feed and discharge ports share a common opening, the feed and discharge ports are designed in the present invention, so that the material can enter the whole vehicle from the feed port and be pulled out from the whole vehicle from the discharge port. Compared with traditional drying, it saves more personnel and can realize the entry and exit of the whole vehicle, avoiding the traditional need to stack trays one by one and constantly change the drying position. The same labor force can greatly increase the daily processing drying volume.

[0036] The feed channel 123 and the discharge channel 124 are both provided with movable sliding doors 125, which ensure the sealing of the drying chamber 12 and improve the drying effect and drying efficiency.

[0037] A drainage groove 6 is also provided in the drying machine body 1, and the drainage groove 6 is located below the hydrophilic aluminum foil core 23, and the drainage groove 6 has a drainage port 61 connected to the outside. The hydrophilic aluminum foil core 23 of the present invention is placed with the vertices of both sides facing the drainage groove 6, and the placement method with the vertices of both sides facing the drainage groove 6 greatly optimizes the sliding path and efficiency of water droplets. First, this inclined placement angle enables the water droplets condensed on the hydrophilic aluminum foil core 23 to slide down quickly in a specific direction under the action of gravity, and its sliding speed is greatly improved compared with horizontal placement or random placement. The residence time of water droplets on the surface of the aluminum foil core is effectively reduced, thereby avoiding the problem of reduced heat exchange efficiency caused by long-term adhesion of water droplets, and ensuring the efficient and stable operation of the entire drying system; moreover, the concentration of the falling position of water droplets is a highlight. The concentrated falling water droplets can accurately fall into the drainage groove 6 below, avoiding the scattered distribution of water droplets inside the drying machine body 1, thereby preventing the equipment from being damp, rusting and other problems that may be caused by residual water droplets, extending the service life of the equipment, and reducing the equipment maintenance cost and failure risk.

[0038] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A steam-type hot air circulation 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 connected to the outside, characterized in that: The drying chamber has a circulating air inlet connected to the hot air channel and a circulating air outlet connected to the heat exchange chamber. The heat exchange chamber is also connected to the air inlet, the air outlet and the hot air channel. A heat exchange device is provided in 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, and 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. A steam-type hot air circulation drying machine according to claim 1, characterized in that: The heat exchange chamber includes a heat exchanger accommodating chamber, an air inlet chamber, an exhaust chamber, a first heating chamber and a second heating chamber. The hydrophilic aluminum foil core is located in the heat exchanger accommodating chamber. The air inlet chamber is communicated with the air inlet, the exhaust chamber is communicated with the air outlet, the first heating chamber is communicated with the hot air channel, the plate heat exchanger is located in the first heating chamber, the second heating chamber is communicated with the circulating air outlet, and the steam economizer is located in the second heating chamber.

3. A steam-type hot air circulation drying machine according to claim 1, characterized in that: The hot air channel is located above the drying chamber, extends along the length direction of the drying chamber and is communicated with the circulating air inlet.

4. A steam-type hot air circulation drying machine according to claim 1, characterized in that: The plate heat exchanger is in communication with the steam economizer.

5. The steam-type hot air circulation drying machine according to claim 1, characterized in that: The circulating air inlet and the circulating air outlet of the drying chamber are both provided with porous air-permeable steel plates, and the circulating air inlet is also provided with a high-temperature circulating fan.

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

7. The steam-type hot air circulation drying machine according to claim 1, characterized in that: The air inlet is provided with an air blower, and the outer side of the air blower is provided with a polyester filter.

8. The steam-type hot air circulation drying machine according to claim 1, characterized in that: The drying chamber is further provided with a feed channel and a discharge channel communicating with the outside, wherein the feed channel is located close to a side of the drying chamber close to the circulating air outlet, and the discharge channel is located close to a side of the circulating air inlet.

9. A steam-type hot air circulation drying machine according to claim 8, characterized in that: The feed channel and the discharge channel are both provided with movable sliding doors.

10. The steam-type hot air circulation drying machine according to claim 1, characterized in that: The drying machine body is also provided with a drainage groove, which is located below the hydrophilic aluminum foil core and has a drainage port connected to the outside.

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