The advantages and disadvantages of liquid nitrogen quick freezing in the food field

2021-01-25 10:28:43

The advantages and disadvantages of liquid nitrogen quick freezing in the food field

With the further improvement and development of liquid nitrogen quick freezing technology, it is quickly and widely used in fish, shrimp, crab, chicken, duck, meat (cattle, sheep, etc.), fruits (bayberry, lychee, etc.), vegetables, and various Freezing of prepared foods (steak, sashimi, meatballs, fried shrimp, patties, hamburgers, pizzas, egg products, soups, etc.)

Liquid nitrogen quick freezing has the following advantages:

(1) Liquid nitrogen can be in close contact with all parts of food with irregular shapes, reducing the heat transfer resistance to a very small limit.

(2) Liquid nitrogen is non-toxic and inert to food ingredients. Furthermore, because it replaces the air coming out of the food, it can reduce oxidation changes during freezing and storage with packaging.

(3) The quality of frozen food is high. Since liquid nitrogen is in direct contact with food, it conducts strong heat exchange with a temperature difference of more than 200K, so the freezing speed is extremely fast, and the temperature can be reduced by 7-15K per minute. The ice crystals in the food are small and uniform, and the food quality after thawing is high.

(4) The dry consumption of frozen food is small. The dry consumption rate of food frozen with general freezing device is between 3% and 6%, while the dry consumption rate is between 0.6% and 1% when freezing with liquid nitrogen freezing device. Therefore, it is suitable for freezing some foods with high moisture content, such as bayberry, tomatoes, crab meat, etc.

(5) Small footprint, low initial investment and high device efficiency.

Liquid nitrogen quick freezing has the following disadvantages:

The advantages of using liquid nitrogen to quickly freeze food are many and varied, but it also has the following problems in its current application, which need to be solved urgently:

After the liquid nitrogen evaporates, it becomes low-temperature nitrogen, which has the ability to absorb a large amount of sensible heat. Making full use of this part of the cold energy is the fundamental to improve the economics of liquid nitrogen refrigeration equipment, but the current utilization rate is not high, and measures need to be strengthened.


Nuoruida (Tianjin) science and Technology Co., Ltd. is committed to research, development, and sales of liquid nitrogen freezer. Using European technology, we provide a variety of equipment. The main equipment is liquid nitrogen cryogenic freezer, liquid nitrogen cabinet freezer, liquid nitrogen tunnel freezer,sub-zero processing equipment, cryogenic freezing equipment, and so on.