High-temperature heat pump drying machine started with heating and operating in high heating load state

Abstract

The invention provides a high-temperature heat pump drying machine started with heating and operating in a high heating load state. The machine comprises a heat pump drying system, a wind inlet passage, a wind outlet passage, and a drying chamber for connecting the wind inlet passage with the wind outlet passage; the heat pump drying system comprises a condenser arranged in the wind inlet passage, and an evaporator arranged in the wind outlet passage; a heater is arranged between the condenser and the drying chamber; air enters from a wind inlet of the wind inlet passage, and becomes high-temperature dried air after passing through the condenser and the heater in sequence, and then the high-temperature dried air is conveyed into the drying chamber and is used for drying operation and turned into humid air; the humid air is discharged and is guided onto the evaporator, and after moisture in the humid air is condensed, the air is discharged through the wind outlet passage. The heater is additionally arranged for increasing the drying operation starting speed of the drying system and the temperature of the dried air and improving the heat and mass transfer intensity of the drying operation, so that the heat absorption intensity of the evaporator is improved; moreover, the heat absorption intensity of the evaporator is improved, so that the heat release intensity of the condenser is improved, and the heat pump drying system can enter a high heating load operation state.

Description

technical field [0001] The invention relates to the technical field of drying device design, in particular to a high-temperature heat pump dryer that is activated by heating and operates under a heavy heat load. Background technique [0002] Heat pump, as a heat transfer tool, as a device to improve the low-grade heat quality of soil, air, and water to obtain higher-grade heat, under the background of energy saving and emission reduction, in the fields of heating, hot water, drying, etc. , has gained more and more widespread application. The essence of heat pump energy saving is to inject a small amount of electric energy to drive the compressor. Through the suction and exhaust operation of the compressor, the low-pressure refrigerant gas that absorbs a large amount of low-grade heat in the evaporator is compressed into high-pressure gas and enters the condenser to achieve high temperature. Bit exothermic. [0003] Usually, the ratio of the heat output power of the heat pu...

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Problems solved by technology

[0005] ①The time required for the start-up process of the heat pump drying system is too long

[0007] Therefore, after the heat pump drying system is started, under the impetus of the compressor, the pressure of the refrigerant gas in the condenser gradually increases until the condensation temperature of the refrigerant gas corresponding to the condensation pressure is higher than the temperature of the ambient air where the condenser is located, thus effectively cooling the ambient air. Heat release; the pressure of the refrigerant gas in the evaporator gradually decreases until the evaporation temperature of the refrigerant liquid corresponding to the evaporation pressure is lower than the temperature of the ambient medium where the evaporator is located, so that it can effectively absorb heat from the ambient medium; at this time, the heat pump drying system starts Into a dry state; to achieve a stable drying condition, the wet material to be dried must first be heated, which also takes a certain amount of time

The start-up process of the heat pump drying system takes a long time

[0008] ②The outlet air temperature of the heat pump condenser is relatively low, the heat and humidity load is relatively low, and the drying capacity is relatively weak

[0011] For industrial and residential heat pump dryers, the outlet air temperature of the condenser is low, generally only about 50°C, the heat and humidity load is obviously low, and the drying capacity is obviously weak.

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