CN103644708A - Method for continuously drying granular materials with heat pump technology - Google Patents

Abstract

The invention belongs to the field of agriculture and deep processing of agricultural products, and discloses a method for drying granular materials with a heat pump for industrial use. The present invention is composed of a heat pump drying and dehumidifying unit 1, a drying chamber 2, a low-speed multi-layer stacked material spreading and conveying belt mechanism 3, an oblique feeder plate 4, a toothed material mixer 5, and a rotary air-isolated distributor 6. In the present invention, since the drying working mode of continuous feeding and continuous discharging is adopted, the drying process experienced by the same batch of materials to be dried in the drying chamber is the same, which ensures that the moisture content of the dried granular agricultural products is consistent sex.

Description

A method of continuous drying of granular materials using heat pump technology

technical field

The invention belongs to the field of agriculture and deep processing of agricultural products, and discloses a method for drying granular materials with a heat pump for industrial use. the

Background technique

In the processing of agricultural products, heat pump technology is mostly used in the field of wood drying at home and abroad. Heat pumps are also used in the drying of materials in the food processing industry, but mainly focus on the drying of aquatic products, livestock and poultry products (more protein and fat) and vegetable products (high moisture content). At present, the heat pump drying unit uses wind as the moisture transfer medium when drying materials, and works intermittently to send the same batch of materials to be dried into the drying chamber at the same time, and discharge the materials at the same time after drying. Due to the low working temperature of the heat pump drying unit, the drying time is longer, so the materials to be dried are in a fixed suspension or fixed storage state in the drying chamber. The drying air is blown into the drying chamber from the air inlet, and leaves the drying chamber from the air outlet after absorbing moisture. The wind at the air inlet is relatively dry, while the wind at the air outlet is relatively humid, resulting in inconsistent distances between the same batch of finished products and the air inlet, and inconsistent moisture content. The phenomenon. The foreign treatment method is to switch the air inlet and outlet in turn, and the moisture content uniformity of the finished product is improved, but the moisture content of the finished product is still different due to the different distance from the air outlet. the

Contents of the invention

The present invention is composed of a heat pump drying and dehumidifying unit 1, a drying chamber 2, a low-speed multi-layer stacked material spreading and conveying belt mechanism 3, an oblique feeder plate 4, a toothed material mixer 5, and a rotary air-isolated distributor 6. the

The purpose of the present invention is to solve the problem of non-uniform moisture content of the finished product of dried granular agricultural products by a heat pump drying device. the

The object of the present invention is achieved through the following measures: the heat pump drying and dehumidifying unit 1 is used for drying the circulating air after absorbing moisture. The rotary air-isolated distributor 6 is used to continuously send the materials to be dried into the drying chamber 2, cut off the connection between the gas in the drying chamber and the outdoor air, and evenly disperse the materials to be dried to the low-speed multi-layer stacked material spreading conveyor belt Institution 3 on. The low-speed multi-layer stacked material spreading conveying belt mechanism 3 is used to expand the material to be dried, increase the surface area of the material to be dried, increase the evaporation of water, and move the material to be dried. In order to prevent the bouncing phenomenon produced when the material on the low-speed multi-layer stacked material paving conveyor belt mechanism 3 falls from the upper layer to the lower layer, an inclined feed guide plate 4 is provided. In order to increase the number of changes in the arrangement order of materials during the drying process, multiple groups of toothed material mixers 5 that are mutually dislocated are arranged on the upper surface of the low-speed multi-layered material paving conveyor belt mechanism 3, which increases the number of wet materials turned from the bottom layer. to the surface. the

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention. the

FIG. 2 is a schematic diagram of the toothed material mixer 5 . the

Fig. 3 is the schematic diagram of rotary windproof distributor 6

Detailed ways

The rotary air-isolated distributor 6 of the material to be dried continuously enters the drying chamber 2, and disperses the material to be dried evenly on the low-speed multi-layer stacked material spreading conveyor belt mechanism 3. The dry air from the heat pump drying and dehumidifying unit 1 blows across the surface of the material to be dried parallel to the low-speed multi-layer stacked material paving conveyor belt mechanism 3, leaves the drying chamber after absorbing moisture, and enters the heat pump drying and dehumidifying unit 1, heat pump drying and dehumidifying unit 1 After the moisture in the circulating air is removed, the dry air is recycled. After the material to be dried is dried on the first layer of the low-speed multi-layered material paving conveyor belt mechanism 3 for a period of time, the surface layer has lost moisture and is moved and dropped to the second layer. The order of the material arrangement changes, and the wet material After being turned over to the surface, it is dried and then dropped to the third layer; after repeated overturning and drying, the moisture content of the material reaches the product requirement, and then it is output from the drying room by the discharge conveyor. The inclined feed guide plate 4 suppresses the bouncing phenomenon when the material on the low-speed multi-layered material paving conveying belt mechanism 3 falls from the upper layer to the lower layer, reduces the loss of materials in the drying process, and reduces the low-speed multi-layered The overall size of the open-type material paving conveyor belt mechanism 3 reduces the overall size of the drying chamber. In order to increase the number of changes in the arrangement order of materials during the drying process, multiple sets of toothed material mixers 5 that are mutually dislocated are arranged on the upper surface of the low-speed multi-layered material paving conveyor belt mechanism 3, so that the wet materials can be dried during the drying process. The increased number of turns to the surface increases water evaporation and reduces drying time. the

In the present invention, since the drying working mode of continuous feeding and continuous discharging is adopted, the drying process experienced by the same batch of materials to be dried in the drying chamber is the same, which ensures that the moisture content of the dried granular agricultural products is consistent sex. the

Claims (5)

1. A method for continuous drying of granular materials using heat pump technology, characterized in that the heat pump drying dehumidification unit (1), drying chamber (2), low-speed multi-layer stacked material paving conveyor belt mechanism (3), Inclined feed guide plate (4), toothed material mixer (5), rotary wind-proof distributor 6 constitute. 2. According to the low-speed multi-layer stacked material paving conveying belt mechanism (3) described in full force requirement 1, it is characterized in that the dry wind from the heat pump drying and dehumidifying unit (1) is parallel to the low-speed multi-layer stacked material paving The conveyor belt mechanism (3) blows over the surface of the material to be dried, forming a dry microclimate on the surface of the material, which is beneficial to the drying of the material; the low-speed moving conveyor belt prolongs the residence time of the material to be dried in the drying chamber, ensuring the moisture content of the dried product When the material falls from the upper layer to the lower layer, the arrangement order of the material on the belt is changed. The material whose surface has been dried enters the inside of the material, and the wet material turns over to the surface. 3. According to the low-speed multi-layer stacked material paving conveyor belt mechanism (3) described in Requirement 1, it is characterized in that it is equipped with an inclined feed guide plate 4, which suppresses the rebound and jumping phenomenon when the material falls from the upper layer to the lower layer , reducing the loss of materials during the drying process, and reducing the overall dimensions of the low-speed multi-layer stacked material paving conveyor belt mechanism 3, and reducing the overall size of the drying chamber. 4. According to the low-speed multi-layer stacked material paving conveyor belt mechanism 3 described in the full force requirement 1, it is characterized in that it is equipped with multiple sets of toothed material mixers 5 that are mutually misaligned, so that the wet material turns over to the surface during the drying process The number of times is increased, which increases the evaporation of water and reduces the drying time. 5. The rotary air-isolated distributor 6 according to Requirement 1 is characterized in that the thin and long cylindrical sheath is symmetrically opened with strip-shaped slots along the axial side wall as the inlet and outlet of the distributor. The sleeve is equipped with a shaft welded at an equal angle, and the warp isolates the drying room from the outside; when the shaft rotates, the space formed between each warp is used for the uniform in and out transfer of materials.

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