Liquid nitrogen freezer is an industrial freezing equipment that utilizes the ultra-low temperature characteristics of liquid nitrogen to quickly freeze food and other items.
Liquid nitrogen freezer is an industrial freezing equipment that utilizes the ultra-low temperature characteristics of liquid nitrogen to quickly freeze food and other items. Here is a detailed introduction about it:
working principleThe boiling point of liquid nitrogen at atmospheric pressure is -196 ℃, and it has the ability to absorb heat. The liquid nitrogen freezer sprays liquid nitrogen directly onto food. Due to the large temperature difference, strong heat exchange occurs, which can complete the freezing process of food in a short time, usually about 20 minutes. Because the freezing speed is extremely fast, the generated ice crystals are very small and have no destructive effect on cells, so they can better maintain the original color, aroma, taste, and freshness of food.
Equipment Classification
Spiral freezerSuitable for various categories such as meat, processed foods, seafood, etc. The inlet and outlet can be designed as low inlet and high outlet or high inlet and low outlet, with a production capacity of usually 500-1500kg/h. The equipment has a drum, and the conveyor belt performs a spiral upward or downward motion on the drum.
Tunnel type freezerIncluding flat mesh belt type, tunnel type pre cooling quick freezing machine, and tunnel type plate belt quick freezing machine. The flat mesh belt type is a universal type with a yield of 100kg/h-2000kg/h; The tunnel style pre cooling and quick freezing machine can combine pre cooling and quick freezing into one, suitable for food that is loaded at high temperatures; The tunnel type plate and strip freezer is mainly used for quick freezing aquatic products.
Box type freezerUsing a pure copper tube evaporator, the temperature inside the cabinet can be balanced. The outer shell and inner liner are usually made of all stainless steel material, which has good corrosion resistance and insulation performance. They are mostly detachable integrated units, which are easy to move and maintain.
Main Configuration
liquid nitrogen systemComposed of liquid nitrogen tank, pressurization system, insulation pipe, control valve, nozzle, distributor, etc. Liquid nitrogen solenoid valves usually use Italian brand ultra-low temperature products, which can be opened normally at -196 ℃. The liquid nitrogen nozzle is composed of hundreds of micropores, which can fully vaporize liquid nitrogen.
fanGenerally equipped with low-noise axial flow fans specifically designed for quick freezing, the return air distance is short, and combined with unique wind field design, it can make the wind speed and temperature in the quick freezing area more uniform, reducing airflow resistance and cooling consumption.
technical advantage
Smart and convenientUsually controlled by PLC microcomputer and equipped with touch screen LCD display, it has automatic control functions such as energy regulation, fault diagnosis, and protection monitoring. The data display is intuitive and the operation is simple.
environmental protection and energy conservationUsing liquid nitrogen as the cold source, liquid nitrogen originates from air and returns to the air after use, without polluting the environment. In addition, the quick freezing tunnel can automatically control the liquid nitrogen flow rate according to the temperature difference, saving liquid nitrogen usage.
Efficient hygieneThe temperature inside the tunnel can be as low as -130 ℃, which can enable the product to meet the quick freezing requirements in 20-40 minutes and quickly inhibit microbial growth. The tunnel cover of some tunnel type quick freezing machines can be raised by a lifting system, making it easy to clean with high-pressure water guns.
Scope of Application: It is suitable for quick-frozen processing of seafood, livestock and poultry meat, various vegetables, diced fruits, rice and flour products, prefabricated prepared dishes and many other foods. For example, sea cucumber, abalone, dumplings, Buddha jumps over the wall, etc. can be frozen and preserved with high quality by liquid nitrogen quick-frozen machine.
