Multi-section heating multi-section tempering and drying airflow closed cycle heat pump drying system

Abstract

The invention provides a multi-section heating multi-section tempering and drying airflow closed cycle heat pump drying system. The multi-section heating multi-section tempering and drying airflow closed cycle heat pump drying system comprises a drying part, a heat pump system, a drying medium inflow channel and a drying medium outflow channel, wherein the heat pump system is used for producing a drying medium, and the drying medium inflow channel and the drying medium outflow channel communicate with the drying part. The inflow channel and the outflow channel communicate end to end. The drying part, the inflow channel and the outflow channel form a loop allowing the drying medium to circulate. The drying part comprises at least one drying room. At least two drying sections are arranged in each drying room. The two or more drying sections are arranged at intervals in sequence, and the space between every two adjacent drying sections form a tempering section. The drying medium from the inflow channel flows through the drying sections. To-be-dried objects pass the drying sections to be dried, enter the tempering sections to be tempered, and then reenter the next drying section to be dried. According to the multi-section heating multi-section tempering and drying airflow closed cycle heat pump drying system, the multiple heating and drying sections and the multiple tempering sections are arranged, so that the drying operation temperature is lowered, the heating energy efficiency ratio of a heat pump unit is greatly increased, and in addition, the dust pollution of air-out of a drying device to the environment is completely eliminated.

Description

technical field [0001] The invention relates to the technical field of drying heat pump design, in particular to a multi-stage heating and multi-stage slow drying airflow closed-circuit circulation heat pump drying system. Background technique [0002] The application of heat pumps to the medium-low temperature drying of wet materials such as wet grains has distinct characteristics of energy saving and environmental protection, and has attracted great attention in the field of thermal technology and all sectors of society. Quite a number of heat pump air-conditioning companies have tested the water for heat pump drying of grains, heat pump drying of wood, heat pump drying of agricultural products such as tobacco leaves, jujubes, wolfberries, grapes, black fungus, and Chinese herbal medicines, food products such as rice noodles, noodles, seafood, and preserved products The heat pump is dry and has achieved good results. [0003] However, the use of heat pumps for grain dryin...

AI Technical Summary

Problems solved by technology

[0018] The heat pump heating energy efficiency ratio is negatively correlated with the cycle temperature rise (condensing temperature - evaporation temperature) of the heat pump system; the lower the cycle temperature rise, the higher the heating energy efficiency ratio; the higher the cycle temperature rise, the lower the heating energy efficiency ratio , and every time the cycle temperature rise increases by 10°C, the heating energy efficiency ratio will decrease by about 20%; when the cycle temperature rise exceeds 60°C, the economy of the heat pump unit will be very poor

[0019] Second, high temperature drying reduces the quality of grain

[0023] However, as far as grain drying is concerned, the dry air with too high temperature will cause the surface and shallow layer of wet grain to lose water quickly and deeply, and the moisture gradient of internal humidity and external dryness will expand rapidly; Severe imbalance between grain and moisture content, resulting in cracks or even cracks in the grain, reducing the biological activity of the grain, and reducing the taste and quality of the grain

[0024] 3. Dust discharge from the drying device pollutes the air environment

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