Dehumidification drying unit adopting an air inlet precooling and efficient dehumidification combined module and drying device

Abstract

The invention discloses a dehumidification drying unit adopting an air inlet precooling and efficient dehumidification combined module and a drying device. At least two sets of heat pump units are included, each heat pump unit includes a compressor, a condenser, a throttling device and an internal dehumidification evaporator which are sequentially connected to form a closed system for refrigerantcirculation, and further includes a cross-flow heat exchanger, each cross-flow heat exchanger is provided with a first heat exchange channel and a second heat exchange channel which are arranged alternately, and air outlets of the first heat exchange channels and air inlets of the second heat exchange channels communicate through circulation channels; the internal dehumidification evaporators of the sets of the heat pump units are sequentially arranged in the circulation channels and located at the air outlets of the first heat exchange channels, and air outlets of the second heat exchange channels are provided with first fans; the condensers of the sets of the heat pump units are sequentially arranged at air outlets of the first fans; and drying airflow is cycled in a closed mode, and part of wet air from the drying device flows through the first heat exchange channels, the multiple internal dehumidification evaporators, the circulation channels, the second heat exchange channels, andthe first fans sequentially, is then mixed with the other part of wet air of the drying device, and passes through the multiple condensers to obtain dry air.

Description

technical field [0001] The invention relates to the technical field of dehumidification device design, in particular to a dehumidification drying unit and a drying device using an air intake precooling and high-efficiency dehumidification combination module. Background technique [0002] The heat pump drying device with closed-circuit circulation of air flow is composed of a heat pump hot air unit that produces high-temperature dry air and a drying space that carries wet materials. [0003] as follows figure 1 , in the existing heat pump drying device with closed-circuit circulation of air flow, the high-temperature dry air produced by the heat pump condenser performs heat and moisture exchange with the wet material, captures the moisture in the wet material and returns to the heat pump evaporator as warm and humid air, The evaporator lowers the temperature, dehumidifies and filters out water vapor, and then enters the condenser to absorb heat and heat up. The temperature r...

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Problems solved by technology

[0010] However, in the later stage of the operation of the airflow closed-circuit circulation heat pump drying device, due to the increase in the drying return air temperature, the decrease in relative humidity, and the decrease in dew point temperature, the "smaller" area of ​​the plate heat exchanger originally configured at the air inlet of the evaporator is reduced. It seems powerless, unable to make the evaporator inlet air be effectively pre-cooled to a "saturated" state or close to a saturated state by the evaporator low-temperature outlet air, repeating "the sensible heat load of the evaporator accounts for an increasing proportion of the total cooling capacity of the evaporator." high, the proportion of damp heat load is getting lower and lower, until the final proportion of damp heat load is zero, the evaporator cannot filter out water, and the last mile of the drying process has not been completed" old problem

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