Heat pump drying system

Abstract

The invention provides a heat pump drying system which comprises a compressor, a condenser, a throttling component, an evaporator, a drying chamber, a backheating heat exchanger and a draught fan. Anoutlet of the compressor is connected with a hot end inlet of the condenser, a hot end outlet of the condenser is connected with a cold end inlet of the evaporator through the throttling component, and a cold end outlet of the evaporator is connected with an inlet of the compressor; a cold end inlet of the backheating heat exchanger inputs air acted by the draught fan, a cold end outlet of the backheating heat exchanger is connected with a cold end inlet of the condenser, a cold end outlet of the condenser is connected with an inlet of the drying chamber, an outlet of the drying chamber is connected with a hot end inlet of the backheating heat exchanger, a hot end outlet of the backheating heat exchanger is connected with an inlet of the draught fan, and an outlet of the draught fan is communicated with the outside. By means of the heat pump drying system, the backheating heat exchanger is used for achieving temperature recovering of air discharged from the drying chamber, the temperature of air entering the cold end evaporator is decreased, the temperature of air entering the hot end condenser is increased, the heat exchange temperature difference can be effectively reduced, coldand heat end heat exchange is improved, and the system efficiency is improved.

Description

technical field [0001] The invention relates to the field of drying technology, in particular to a high-efficiency heat pump drying system that uses heat recovery to fully recover energy. Background technique [0002] Drying technology has a very wide range of applications in many industries. However, the traditional drying process consumes a lot of energy. In developed countries, about 10% to 20% of the fuel is used in the drying process. Heat pump technology has been introduced into the drying industry due to its advantages of high efficiency, energy saving, low cost, and no pollution to the environment. At the same time, it can achieve accurate and independent control of temperature, humidity, and air velocity. It has been widely used in wood, seeds, tobacco, and textiles. , laundry and other industries. [0003] Chinese patent CN 103827385 A discloses a dryer using a heat pump, which obtains heat from the condenser at the high temperature end, recovers part of the heat...

AI Technical Summary

Problems solved by technology

However, in this kind of dryer, the temperature of the gas coming out of the drying chamber is still high, and there is a huge potential for recovery. When it directly enters the evaporator and condenser, the heat exchange temperature difference is large, and the energy utilization efficiency is reduced, which in turn leads to a decrease in the efficiency of the entire system.

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