Superhigh-temperature heat pump drying system

Abstract

The invention relates to a superhigh-temperature heat pump drying system. The superhigh-temperature heat pump drying system comprises a drying room, an air return duct, a circulating draught fan, an exhaust duct, an exhaust fan, an air heat recovering device and at least two heat pump units. The air return duct is communicated with an air supply port and an air return port of the drying room. The circulating draught fan is arranged in the air return duct. The exhaust duct is communicated with the air return duct. The exhaust fan is arranged at a duct opening of the exhaust duct. The air heat recovering device is arranged at the intersection of the air return duct and the exhaust duct. The heat pump units are used in parallel. According to the superhigh-temperature heat pump drying system, the two or more heat pump units work in parallel, and the drying room is heated by absorbing low-grade ambient air heat at the initial stage of the drying process, so that the temperature is increased; after the temperature is increased to a certain extent, high-temperature and high-humidity air exhausted out of the drying room is dehumidified, and sensible heat and latent heat contained in the high-temperature and high-humidity air are recovered to the maximum extent; due to the gradient difference of the temperature ranges of cycle working fluid of the heat pump units, relatively higher air supply temperature can be provided through the system, and meanwhile it is guaranteed that the evaporating temperature of the drying units is sufficiently increased.

Description

technical field [0001] The invention relates to a heat pump drying system, in particular to a high-efficiency heat pump drying system capable of providing ultra-high temperature air supply under normal ambient temperature. Background technique [0002] Drying has always been an indispensable basic production link for a large number of industrial and agricultural products, and it is also a large energy consumer. According to statistics, the energy used in drying operations accounts for about 12% of the total energy consumption of the national economy in China. At the same time, the pollution caused by the drying process is An important source of environmental pollution. Due to the energy crisis, many traditional drying equipment are forced to shrink, and heat pump drying equipment has been widely used as an energy-saving and environmentally friendly product. At present, the vapor compression heat pump is widely used in the industry, which relies on the circulation of the ref...

AI Technical Summary

Problems solved by technology

However, the existing heat pump drying equipment in the market can only provide air supply at a maximum of 80°C, so it can only work in medium and low temperature drying occasions. At the same time, it is difficult to replace traditional drying equipment on a large scale, and there are certain difficulties in popularization.

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