Microwave heat pump low-oxygen drying device and operating method thereof

Abstract

An efficient and energy-saving microwave heat pump low-oxygen drying device comprises a box body (1), a material frame (4), a control box (9) and a carbon dioxide source (14). A microwave generator (5) is arranged on the box body (1). A heat pump system is arranged inside the box body (1). A fan (13) is arranged below the material frame (4). A carbon dioxide supply pipe (19) and an exhaust pipe (18) are connected to the lower portion of the box body (1). The carbon dioxide supply pipe (19) is connected with the carbon dioxide source (14). An inlet valve (15) is arranged on the carbon dioxide supply pipe (19). The exhaust pipe (18) is connected with the lower portion of the box body (1). An exhaust valve (12) is arranged on the exhaust pipe (18). According to the microwave heat pump low-oxygen drying device, microwaves and a heat pump system are combined, materials are heated internally and externally at the same time, heating is more uniform, and drying efficiency is improved; carbon dioxide is used as a drying medium, the materials can be prevented from being oxidized and browned, and nutrient ingredients of the materials are effectively retained.

Description

technical field [0001] The invention relates to material drying in the fields of food, chemical industry, medicine, environmental protection and the like, in particular to a microwave heat pump low-oxygen drying equipment and an operating method thereof. Background technique [0002] Nowadays, in the food, chemical, pharmaceutical, and environmental protection industries, the combination of various drying methods, learning from each other, is an important development direction of the material drying processing industry. At present, microwave, far infrared, high frequency and other internal heating sources are combined with external heating (hot air drying, heat pump drying, fluidized bed drying) to achieve a significant reduction in drying time, achieve high efficiency and energy saving, and improve product drying quality. Purpose. [0003] Heat pump drying is a commonly used drying method at present. This method can absorb heat from the natural environment or waste heat re...

AI Technical Summary

Problems solved by technology

However, microwave energy consumption is large and the processing capacity is small. Often due to the heat dissipation from the outer surface and the untimely evaporation of water, the internal temperature rise of the object is too high, and the internal and external temperature difference is large, which affects product quality.

[0006] Fuzhou Jindian Investment Co., Ltd. discloses an oxygen-poor heat pump dryer (public number: CN2859414Y). This equipment is mainly composed of a heat pump source, a drying chamber, and a combustion chamber. It does not change the traditional heat pump system and adds a combustion link to the air circulation loop. To consume oxygen in the air, although it can reduce energy consumption to a certain extent, and also meet the requirements of protecting materials from oxidation under low oxygen, it still has the problem of slow speed in the hot air drying method, which is not conducive to the nutrient content of the product. reserve

Moreover, the consumption of oxygen through combustion may cause incomplete combustion to produce toxic gases, which is harmful to the environment and human body

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