Heat pump tail heat utilization countercurrent dryer

Abstract

The invention discloses a heat pump type counter-flow dryer utilizing tail gas heat. 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 main unit through a refrigerant pipe, and the main unit is connected with a condenser through a refrigerant pipe; an air outlet end of an air blower is connected with an air inlet cover through the condenser; an impeller of the induced draft fan is provided with blades adopting a hollow wedged structure; the outline of the induced draft fan is an involute. Through counter-flow low-temperature drying of materials is realized through the induced draft fan, a heat exchanger, a sealed conical hopper arranged below a sieve plate steel belt as well as an axial fan arranged in the conical hopper, and the heat pump system is especially suitable for heat recovery of low-temperature tail gas; the blades adopt the hollow wedged structure, so that dust on the impeller of the induced draft fan can be cleaned in real time, the impeller strength of the fan is improved, the stability is improved, safety accidents caused by accumulation of dust are effectively prevented, and the application prospect is wide.

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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