Heat pump tail heat recovery countercurrent dryer

Abstract

The invention discloses a heat pump type tail heat recovery counterflow drying machine. A draught hood of the drying machine is connected with an induced draft fan, the induced draft fan is connected with an evaporator of a heat pump system through a cyclone dust collector, and then evacuation is carried out. The evaporator of the heat pump system is connected with a main engine through a refrigerant tube, and the main engine is connected with a condenser through a refrigerant tube. The air outlet end of an air blower is connected with an air inlet hood through the condenser. An impeller of the induced draft fan is provided with a structure with hollow inverted-drop-shaped blades. The contour line of the appearance of the induced draft fan is an involute. The induced draft fan, a heat exchanger and a closed cone hopper below a screen plate steel rip are arranged, an axial fan is arranged in the cone hopper, so that penetrating type counterflow low-temperature drying of materials is achieved, and the heat pump system is especially suitable for recovery of heat of low-temperature tail gas. The blades are of a hollow inverted drop shape, so that dust on the impeller of the induced draft fan is removed in real time, the strength of the impeller of the fan is increased, and stability is improved; and potential safety hazards caused by dust accumulation are effectively eradicated, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to a drying machine, in particular to a heat pump tail heat recovery countercurrent drying machine in which a fan does not accumulate dust. Background technique [0002] People generally refer to drying with a drying temperature below 60 degrees Celsius as low-temperature drying. Low-temperature drying is widely used in the drying of heat-sensitive materials such as crop seeds, Chinese medicinal materials, and biological products. Due to its mature technology, strong adaptability, low operating cost and high reliability, hot air dryer is still one of the first choice equipment for low temperature drying. Low-temperature drying is less easy to recover tail heat due to the lower exhaust temperature. If the penetration and countercurrent drying of materials can be realized in the hot-air low-temperature drying process, and the tail heat can be effectively recovered, it will be of great significance for improving drying efficiency an...

AI Technical Summary

Problems solved by technology

Once part of the hardened dust is shaken off, it will immediately leave the dynamic rotation balance of the induced draft fan, and then generate strong vibration, which may cause serious personnel and equipment safety accidents

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