The liquid nitrogen spray freezing device freezes aquatic products by directly contacting the sprayed liquid nitrogen. gf-machine Freezing iqf manufacturers use liquid nitrogen spray freezing devices to freeze aquatic products has the following advantages: Liquid nitrogen with a freezing speed of-196 ℃ is sprayed on aquatic products, and the freezing speed is extremely fast, which is 5-6 times higher than that of a flat plate freezing device and 20-30 times higher than that of an air freezing device. 2. The frozen product is of good quality. Because the freezing speed is fast, and the freezing speed is higher than the water movement speed, ice crystals are generated inside and outside the cell at the same time. The ice crystals are fine, evenly distributed, and have no damage to the cell, so the loss of liquid drops during thawing is less, and the fresh state before freezing can be restored. 3. Most frozen foods with small dry consumption need to be frozen before packaging. Liquid nitrogen spray freezing can reduce the dry consumption value. Taking oyster monomer freezing as an example, the dry consumption of blowing freezing is 8%, while that of liquid nitrogen spraying freezing is 0.8%. 4. Antioxidative nitrogen is an inert gas and generally does not react with any substance. Liquid nitrogen is used as a refrigerant to directly contact with aquatic products. For fish containing highly unsaturated fatty acids, oil consumption will not occur due to oxidation during freezing. 5. The device has high efficiency, small occupied area and low equipment investment.
