A waste heat recovery drying and humidifying equipment

Abstract

This utility model discloses a waste heat recovery drying and rehumidification device, belonging to the field of drying technology. It includes a dryer and a spraying device. The dryer comprises a heating unit and an oven. A frame is installed inside the heating unit, and an electric heater and a draft fan are fixedly mounted on the frame. The draft fan is located above the electric heater, with the airflow directed downwards to the upper right. The nozzle of the spraying device is located at the bottom of the oven. A heat exchange core is installed at the connection between the upper part of the oven and the heating chamber. The heat exchange core consists of intersecting air ducts arranged at intervals. The longitudinal air ducts form the air inlet pipe of the dryer, connecting to the heating chamber, while the transverse air ducts form the air outlet pipe, discharging waste gas from the oven. The water inlet pipe of the spraying device is connected to an external water source. This utility model achieves efficient heat recovery and condensate recovery through the heat exchange core and rehumidifies the material through the spraying device, achieving energy saving and efficient rehumidification.

Description

Technical Field

[0001] This utility model relates to the field of material drying equipment and rehumidification technology, and more specifically, to a waste heat recovery drying and rehumidification equipment. Background Technology

[0002] Currently, leafy agricultural products (including bamboo leaves), flowers, tobacco leaves, and traditional Chinese medicinal materials such as ginseng and wolfberry generally have very low moisture content after drying, making them extremely fragile and severely reducing product quality. Therefore, leafy agricultural products and traditional Chinese medicinal materials must undergo rehydration treatment in the later stages of drying to soften the leaves slightly, thereby ensuring the quality of the leafy agricultural products and the uniformity of internal moisture in the traditional Chinese medicinal materials, and preventing them from becoming brittle due to excessive dryness.

[0003] The current method of rehumidification after drying is natural rehumidification, which involves opening the drying chamber after the product has been dried to allow the product to absorb moisture from the outside air, thus achieving the purpose of rehumidification. This method is not limited by the location and is convenient and labor-saving. However, this method is severely limited by local climate conditions, cannot be automatically controlled, and cannot achieve a rapid and uniform rehumidification effect, thereby reducing the quality of the product.

[0004] In the prior art, such as patent ZL201620477518.9, an automatic humidification and rehumidification system for drying mentions adding a spray device and a heating device in the drying chamber to improve the drying quality of tobacco leaves, save drying time, and reduce drying costs.

[0005] However, the above-mentioned patent has obvious shortcomings. Although using tap water and heating devices to provide hot water can quickly rehydrate, it has problems such as high heating energy consumption, reduced or diluted taste of materials and loss of the quality of the rehydrated water source. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to solve the problem of waste heat and waste gas in the drying room and to make comprehensive use of it, so as to provide an energy-saving and aroma-enhancing material drying and rehumidification equipment.

[0007] To solve the above problems, this utility model adopts the following technical solution: a waste heat recovery drying and dehumidification device, including a dryer and a spraying device. The dryer includes a heating host and a drying oven that can be detachably installed on one or both sides of the heating host. The heating host has a frame, and an electric heater and a duct fan are fixedly installed on the frame. The duct fan is located above the electric heater and the airflow is directed to the upper right and downward. The duct fan and the electric heater form a heating chamber through the frame and partition. The nozzle of the spraying device is located at the bottom of the drying oven. A heat exchange core is set at the upper part of the drying oven where it communicates with the heating chamber. The heat exchange core is composed of intersecting air ducts arranged at intervals. The longitudinal air ducts form the air inlet pipe of the dryer and connect to the heating chamber, while the transverse air ducts form the air outlet pipe to discharge the waste gas from the drying oven. The air ducts are made of thermally conductive metal material. A liquid collection tank is provided below the heat exchange core. The liquid collection tank is connected to a condensate tank through a water pipe. The water inlet pipe of the spraying device is connected to an external water source.

[0008] Furthermore, the condensate tank is connected to the water tank of the spray device via a pipe.

[0009] Furthermore, a guide plate is provided at the bottom of the heating host below the electric heater.

[0010] Furthermore, the spray device has multiple micron-sized nozzles arranged in a matrix and extended through pipes at the bottom of the oven.

[0011] Furthermore, the water inlet pipe of the spray device is connected to a tap water pipe, and a water purifier is provided at the front end of the water inlet pipe.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] (1) During the material drying process, the heat exchange core is designed to use the high-temperature exhaust gas discharged from the oven to heat the outside air entering the heating chamber of the dryer to achieve heat recovery. Here, the heat exchange core will generate high-temperature moisture that condenses upon cooling to form condensate. This part of the condensate is collected in the condensate tank. This part of the condensate can be used to extract essential oil (the material is rose petals, etc.).

[0014] (2) The staggered arrangement of air ducts maximizes the heat exchange between the waste heat of the exhaust gas and the intake air (i.e., fresh air), resulting in high heat recovery efficiency. The design of the flue allows the exhaust gas and fresh air to rotate spirally within the air duct, improving the heat exchange rate. The design of the heat exchange rack increases the heat conduction area, further improving the heat exchange rate.

[0015] (3) During the material rehydration process, the droplets sprayed by the spraying device come into contact with the dry material with the wind. Compared with rehydration in the air, the rehydration efficiency is effectively improved. Furthermore, the moisture content of the rehydrated material can be controlled according to the spraying time, so that the moisture content of the material can be accurately controlled and the product quality can be effectively guaranteed.

[0016] (4) The condensate is connected to the water tank of the spray device. The condensate contains a large amount of the fragrance components and essence of the material itself, which can make the water mist sprayed by the spray device contain the fragrance components and essence of the material. This part of the fragrance and essence is absorbed by the dried material through the droplets, so as to enhance the fragrance and improve the quality of the product. For example, after the bamboo leaves absorb this part of the evaporated fragrance components, when wrapping the rice dumplings, the fragrance components will penetrate into the rice dumplings, which will enhance the aroma of the rice dumplings.

[0017] (5) Traditional water sources (usually tap water) typically contain mineral salts such as calcium and magnesium (i.e. scale). Using a water purifier can effectively prevent calcium salts from being sprayed onto the surface of leaves or Chinese medicinal materials with water mist, evaporating and drying, and crystallizing, which may affect the quality of the product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the heat exchange core structure of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model; Example

[0021] like Figure 1 and 2As shown, the waste heat recovery drying and dehumidification equipment of this application includes a dryer 1 and a spray device 2. The dryer 1 includes a heating host 11 and an oven 12 that can be detachably installed on one or both sides of the heating host 11 (if ovens are installed on both sides of the host, the spray device can be installed behind the heating host). The heating host 11 has a frame 111 inside, and an electric heater 112 and a duct fan 113 are fixedly installed on the frame 111. The duct fan 113 is located above the electric heater 112 and the airflow is directed to the upper right and downward. The duct fan 113 and the electric heater 112 form a heating chamber 114 through the frame 111 and a partition. The nozzle 21 of the spray device 2 is located at the bottom of the oven 12. A heat exchange core 3 is installed at the upper part of the oven 12 where it communicates with the heating chamber 114. The heat exchange core 3 is composed of intersecting air ducts 31 arranged at intervals, wherein the longitudinal air ducts 31 The air inlet pipe 32 of the dryer is connected to the heating chamber 114, and the horizontal air duct 31 forms the air outlet pipe 33 to discharge the exhaust gas from the oven 12. The air duct 31 is made of thermally conductive metal material. A liquid collection tank 4 is provided below the heat exchange core 3. The liquid collection tank 4 is connected to the condensate tank 5 through a water pipe 41. The water inlet pipe of the spray device 2 is connected to an external water source.

[0022] During the material drying process, the heat exchange core is designed to use the high-temperature exhaust gas discharged from the oven to heat the outside air entering the heating chamber of the dryer, thereby achieving heat recovery. The heat exchange core will generate high-temperature humid gas that condenses upon cooling to form condensate. This condensate is collected in a condensate tank, and this condensate can be used to extract essential oils (the material is rose petals, etc.).

[0023] The staggered arrangement of the ductwork maximizes the heat exchange between the waste heat from the exhaust gas and the incoming air (i.e., fresh air), resulting in high heat recovery efficiency. The flue design allows the exhaust gas and fresh air to spiral within the ductwork, further enhancing the heat exchange rate. The heat exchange rack design increases the heat conduction area, further improving the heat exchange rate.

[0024] During the material rehydration process, the mist sprayed by the spraying device comes into contact with the dry material with the wind. Compared to rehydration in the air, the rehydration efficiency is effectively improved. Furthermore, the moisture content of the rehydrated material can be controlled according to the spraying time, allowing for precise control of the material's moisture content and effectively ensuring product quality.

[0025] The condensate tank 5 is connected to the water tank 2 of the spray device 2 via a pipe. The condensate is connected to the water tank of the spray device. The condensate contains a large amount of the fragrance components and essence of the material itself, so that the water mist sprayed by the spray device contains the fragrance components and essence of the material. This part of the fragrance and essence is absorbed by the dried material through the droplets, so as to enhance the fragrance and improve the quality of the product. For example, after the bamboo leaves absorb this part of the evaporated fragrance components, when wrapping rice dumplings, this fragrance component will penetrate into the rice dumplings, enhancing the aroma of the rice dumplings.

[0026] The bottom of the heating unit below the electric heater 112 is equipped with a guide plate 115. The guide plate can change and straighten the airflow, prevent the airflow from impacting the bottom plate and causing turbulence, and ensure that the subsequent airflow carries the spray droplets more evenly.

[0027] The spray device 2 has multiple micron-sized nozzles arranged in a matrix, which are extended through pipes and positioned at the bottom of the drying oven 12. The matrix arrangement of the nozzles ensures even coverage of the oven bottom, allowing the spray droplets to be evenly carried upwards by the airflow to dry the material. At this time, the induced draft fan operates at a low speed, resulting in a slow airflow.

[0028] The water inlet pipe of the spray device 2 is connected to a tap water pipe, and a water purifier 23 is installed at the front end of the water inlet pipe. Traditional water sources (usually tap water) usually contain mineral salts such as calcium and magnesium (i.e., scale). Using a water purifier can effectively prevent calcium salts from being sprayed onto the surface of leaves or Chinese medicinal materials with water mist, evaporating and drying, and crystallizing, which may affect the quality of the product.

[0029] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A waste heat recovery drying and dehumidification device, characterized in that: The device includes a dryer and a spraying device. The dryer includes a heating main unit and a drying oven that can be detachably installed on one or both sides of the heating main unit. The heating main unit has a frame, and an electric heater and a duct fan are fixedly installed on the frame. The duct fan is located above the electric heater and the airflow is directed to the upper right and downward. The duct fan and the electric heater form a heating chamber through the frame and partition. The nozzle of the spraying device is located at the bottom of the drying oven. A heat exchange core is installed at the upper part of the drying oven where it connects to the heating chamber. The heat exchange core is composed of intersecting air ducts arranged at intervals. The longitudinal air ducts form the air inlet pipe of the dryer and connect to the heating chamber, while the transverse air ducts form the air outlet pipe to discharge the exhaust gas from the drying oven. The air ducts are made of thermally conductive metal material. A liquid collection tank is provided below the heat exchange core. The liquid collection tank is connected to a condensate tank through a water pipe. The water inlet pipe of the spraying device is connected to an external water source.

2. The waste heat recovery drying and dehumidification equipment as described in claim 1, characterized in that: The condensate tank is connected to the water tank of the spray device via a pipe.

3. The waste heat recovery drying and dehumidification equipment as described in claim 1, characterized in that: A guide plate is provided at the bottom of the heating unit below the electric heater.

4. The waste heat recovery drying and dehumidification equipment as described in claim 1, characterized in that: The spray device consists of multiple micron-sized nozzles arranged in a matrix, which are extended through pipes and positioned at the bottom of the oven.

5. The waste heat recovery drying and dehumidification equipment as described in claim 1, characterized in that: The water inlet pipe of the spray device is connected to the tap water pipe, and a water purifier is installed at the front end of the water inlet pipe.

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