Variable-temperature drying device of medium and high temperature heat pump

Abstract

The invention discloses a variable-temperature drying device of a medium and high temperature heat pump. According to the variable-temperature drying device, the technical advantages of wide drying temperature zone (0 to 80 DEG C) and controllable humidity of a drying media (air) of the medium and high temperature heat pump are utilized, an electric temperature and moisture control air valve is regulated to obtain a controllable sealed, semi-open or fully-open heat pump system, the variable-temperature and variable-moisture segmental drying of agricultural products is realized, and the purposes of low energy consumption of a drying process and high quality of dried products can be achieved. Materials can be prevented from thermal destruction in a high moisture environment by variable-temperature drying, and variable-moisture drying can be used for preventing the surfaces of materials from crusting or hardening and is favorable for inside moisture from transferring to the surfaces. The variable-temperature drying device adopts an intermittent drying mode. Compared with hot air drying equipment which gives priority to power consumption, the variable-temperature drying device has prominent energy efficiency, and the quality of a product dried by the variable-temperature drying device can be more easily controlled. The variable-temperature drying device can be widely applied to the drying of heat sensitive materials, such as agricultural products and aquatic products, and can be used for drying in industries, such as biological products, Chinese patent medicines and chemical engineering.

Description

technical field [0001] The invention relates to a medium-high temperature heat pump drying device for heat-sensitive agricultural products, in particular to a medium-high temperature heat pump dryer for high value-added agricultural product materials. Background technique [0002] Agricultural products are heat sensitive, and their drying has always been a processing challenge. Due to the high drying temperature of traditional hot air drying, it is easy to cause biological, physical and chemical changes, resulting in hardening of the material surface, destruction of active ingredients, and decline in product quality. Freeze drying and vacuum drying are not widely used in the drying process of agricultural products due to high investment and operating costs. Low-temperature heat pump drying (0°C-45°C) is a highly energy-efficient and feasible drying method. Its dried products are of high quality and good quality, but its disadvantage is that the drying time is too long, and ...

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Problems solved by technology

[0006] The main purpose of this invention is to take advantage of the technical advantages of a medium-high temperature heat pump with a wide drying temperature range (0°C-80°C) and controllable humidity of the drying medium (air), and obtain closed, half-open and full-open conditions by adjusting the humidity temperature to control the air valve. The system realizes the variable temperature and wet drying of the equipment, and solves the problem of long drying time of the low-temperature heat pump, which is easy to cause biological pollution and the thermal efficiency decline of the closed heat pump drying system in the later stage of drying.

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