The invention discloses a static
magnetic field assisted liquefied CO2 pulse spouting
quick freezing device and a pressurized efficient freezing method, and belongs to the technical field of freezing
processing. The quick-freezing device comprises a
freezing chamber, a liquid CO2 spraying device, a static
magnetic field generating device, a pulse spouting device, a temperature collecting device and a controller, liquefied CO2 is adopted as a freezing medium, the pulse spouting device is matched to enable thick stacked materials to be frozen evenly and quickly, the static
magnetic field generating device is matched to assist in freezing, and the size of
ice crystals can be reduced. The freezing method comprises the steps of evacuation, precooling, CO2 pressurization, magnetic field-assisted
quick freezing and
deep freezing. According to the method, CO2 pressurization pretreatment and pulse spouting are combined, the freezing time is remarkably shortened, the ice
nucleation process is regulated and controlled, and freezing is uniform. Compared with industrial
air blast quick-freezing, the time for the frozen materials to pass through the maximum ice
crystal generation zone is shortened by more than 20%, and the ice
crystal size of the product is reduced by more than 20%. The juice
loss rate of the unfrozen product is reduced by more than 4%.