Tunnel type food quick-freezing machines are generally classified into tunnel type liquid nitrogen quick-freezers and tunnel type compressor quick-freezing machines according to cold sources.

The tunnel type compressor quick-freezing machine is a common one. The general theoretical temperature can reach minus 35 degrees, the freezing time is usually about half an hour, the cost of the machine itself is relatively high, and the later operating cost is mainly the electricity cost of the compressor. Trouble, no preservation effect.

The tunnel type liquid nitrogen quick-freezing machine is a relatively new type of quick-freezing method that has been developed in China in recent years. It has been used abroad for a long time. This technology has gradually matured and developed in China in recent years, because with the Chinese people's varieties of food. The requirements are getting higher and higher, and there will be more and more enterprises using liquid nitrogen quick-freezer in the later stage. The cost of the machine itself is much lower than that of the compressor. The later operating cost is mainly the cost of liquid nitrogen consumption, because the liquid nitrogen quick-freezing machine is frozen food. The consumption of liquid nitrogen, the theoretical consumption is 10-15 minutes to freeze a ton of food, consumption of 1.2 tons of liquid nitrogen.

The overall cost calculation, the liquid nitrogen quick freezing advantage is higher, and the quick freezing time is short and the efficiency is high.