Heat pump type exhaust heat utilization counterflow dryer

Abstract

The invention discloses a heat pump type exhaust heat utilization counterflow dryer. A draught hood of the dryer is connected with an induced draft fan, and the induced draft fan is emptied after being connected with an evaporator of a heat pump system through a cyclone dust collector; the evaporator of the heat pump system is connected with a host through a refrigerant pipe, and the host is connected with a condenser through a refrigerant pipe; the air outlet end of a blast blower is connected with an air inlet housing through the condenser; an impeller of the induced draft fan is provided with blades shaped like hollow wedges, and a back plate is of a dish-shaped structure; and the outer contour line of the induced draft fan is an involute. The heat pump type exhaust heat utilization counterflow dryer is provided with the induced draft fan, a heat exchanger and a sealed conical hopper which is arranged below a sieve plate steel strip, and the conical hopper is internally provided with an axial fan, so that the penetration-type counterflow low-temperature drying of materials is realized, and the heat pump system is particularly suitable for recovering heat of low-temperature tail gases; and the blades are shaped like hollow wedges, and the back plate is of the dish-shaped structure, so that dust on the impeller of the induced draft fan can be cleared in real time, the strength of the impeller of the fan is improved, the stability is improved, safety accidents caused by dust accumulation is effectively avoided. Therefore, the heat pump type exhaust heat utilization counterflow dryer has a broad application prospect.

Description

technical field [0001] The invention relates to a dryer, in particular to a heat pump tail heat utilization countercurrent dryer which does not accumulate dust in a fan. 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 likely to utilize tail heat due to the lower temperature of exhaust gas. 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 and real...

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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