Dehumidification type heat pump drying system provided with bypass air duct

Abstract

The invention discloses a dehumidification type heat pump drying system provided with at least one bypass air duct. The dehumidification type heat pump drying system comprises a drying chamber, a heat pump system and an air duct system. An air inlet and an air outlet are formed in the drying chamber. The air duct system comprises an air supplying pipeline, the bypass air duct and an air return pipeline. An induced draft fan is arranged inside the air supplying pipeline. The air supplying pipeline is connected with the air inlet of the drying chamber. The air return pipeline is connected with the air outlet of the drying chamber. The air return pipeline is connected with the air supplying pipeline. An air valve is arranged inside the bypass air duct. The heat pump system comprises a compressor, a condenser, a liquid storage tank, a drying filter, an expansion valve, an evaporator and a gas-liquid separator, wherein the compressor, the condenser, the liquid storage tank, the drying filter, the expansion valve, the evaporator and the gas-liquid separator are connected in sequence. The condenser and the evaporator are arranged in the air return pipeline. According to the dehumidification type heat pump drying system, the temperature and the air volume of the drying chamber are adjusted by adjusting the air valve on the bypass air duct, the temperature and the air speed required by the material drying process are reached, the quality stability of dried products is improved, the requirements of a continuous drying technique can be met, and the production capacity is improved.

Description

technical field [0001] The invention relates to the technical field of dehumidification and drying of agricultural products, in particular to a dehumidification heat pump drying system with a bypass air duct. Background technique [0002] Drying occupies an important position in the fields of industrial and agricultural applications. Drying of agricultural products can improve the storage performance of products, extend the storage period, improve food quality, and facilitate transportation and circulation. At present, most of the large-scale material drying still adopts the heating method of boilers. The product drying process consumes a lot of energy, low energy utilization rate, high operating costs, large floor area, and smoke exhaust will cause environmental pollution. Therefore, energy saving and environmental protection are particularly important in the drying of agricultural products. [0003] The Chinese invention patent with the application number CN201310321616.4...

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Problems solved by technology

[0004] In order to overcome the deficiencies in the above-mentioned prior art, the present invention proposes a dehumidification heat pump drying system with a bypass air duct, which solves the problems of high energy consumption and complex structure of the existing heat pump drying system, and recovers waste gas of heat, realizing the effective utilization of waste heat, and high efficiency, energy saving and environmental protection

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