Multi-stage heat pump drying and dehumidifying system with bypass pipeline

Abstract

The invention belongs to the technical field of hot air drying of agricultural and sideline products, and discloses a multi-stage heat pump drying and dehumidifying system with a bypass pipeline. Thesystem comprises a control unit, a main air channel and a drying chamber which is used for containing to-be-dried materials; an air supply inlet for introducing air and an air exhaust outlet for discharging the air are formed in the drying chamber; the two ends of the main air channel are communicated with the air supply inlet and the air exhaust outlet respectively, and the main air channel is internally provided with a main blower, a dehumidifying chamber, a water baffler and a heating chamber, wherein the dehumidifying chamber, the water baffler and the heating chamber are sequentially arranged in the air flow direction; the multi-stage heat pump drying and dehumidifying system further comprises a multi-stage heat pump unit and the bypass pipeline which is communicated with the dehumidifying chamber, and multi-stage heating and multi-stage humidifying are achieved. Compared with a single-stage heat pump drying system, the pressure ratio of a compressor is reduced, the efficiency ofthe compressor is improved, and the air volume control based on the bypass pipeline effectively adjusts the humidifying performance of the system, so that the system has a wider adjusting range.

Description

technical field [0001] The invention relates to the technical field of hot air drying of agricultural by-products, in particular to a multi-stage heat pump drying and dehumidification system with a bypass pipeline. Background technique [0002] With the rapid development of heat pump technology, research on drying has become a hot spot. Heat pumps have the advantages of energy saving, environmental protection, and high temperature control accuracy. Compared with traditional coal-fired drying systems, they have greater advantages in improving drying quality, reducing drying energy consumption, and protecting the environment in the drying process of agricultural and sideline products. [0003] The heat pump's high efficiency, energy saving performance, environmental protection and other characteristics have been confirmed by domestic and foreign literature research and production practice. The application of heat pump in the drying system is divided into three types: fully op...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the problem that the fully open and semi-open drying systems are prone to frost in areas with low outdoor environment, and the single-stage heat pump system is difficult to adapt to the environment with a large return air temperature difference, and realize various Dry conditions

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