Method and device for preparing granular ice by freezing atomized water drops in cold carrying airflow

Abstract

The invention discloses a method and a device for preparing granular ice by freezing atomized water drops in cold carrying airflow. The method mainly comprises the following steps of: delivering the cold carrying airflow to a refrigerating device through a circulating booster fan to cool the airflow; delivering the low-temperature airflow to a granular ice freezing passage, meanwhile, spraying the atomized water drops into the granular ice freezing passage through an atomizing nozzle, and cooling the atomized water drops by the low-temperature airflow to form granular ice; and discharging the cold carrying airflow and the granular ice into a cyclone separator together, wherein the granular ice slides down along the inner wall of the cyclone separator and is discharged from the lower part of the cyclone separator and collected. The device for preparing the granular ice according to the method comprises the circulating booster fan, the refrigerating device, a water supply tank, the atomizing nozzle, the granular ice freezing passage and the cyclone separator. By using the method and the device for preparing the granular ice, the thermal resistance problem of an ice layer produced on a solid heat transfer surface can be avoided, and the heat efficiency of the ice making process is improved; and the method and the method are suitable for large-scale industrial ice making.

Description

technical field [0001] The invention relates to a method and a device for producing granular ice, in particular to a method and a device for producing granular ice by freezing atomized water droplets in a cold-carrying airflow. Background technique [0002] Ice making is widely used in food preservation, industrial cooling, air conditioning and ice storage. Since the thermal conductivity of ice is two orders of magnitude smaller than that of metal, for example, the thermal conductivity of copper and aluminum at 0°C is 401 W / (m K) and 236 W / (m K) respectively, while the thermal conductivity of ice It is only 2 W / (m·K), so when the ice layer is formed on the solid heat transfer surface, a large heat transfer resistance will be generated, the heat transfer temperature difference will increase, the energy consumption of ice making will increase, and the ice making speed will decrease. It slows down as the thickness of the ice layer increases, which will significantly reduce t...

AI Technical Summary

Problems solved by technology

However, the ice-making equipment used in the existing above-mentioned ice-making method is complicated, the investment is high, it is not suitable for large-scale ice-making, and the thermal efficiency of ice-making also needs to be further improved.

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