Introduction to Tunnel Liquid Nitrogen Freezer:

Tunnel type liquid nitrogen quick freezing machine is a large-scale quick freezing machine suitable for large-scale processing and production on factory assembly lines, with strong quick freezing ability; Easy to operate and highly automated. The tunnel type liquid nitrogen freezer is suitable for industrial production modes with large quantities, continuity, few people, and large areas. It can be combined with other food lines to form an automatic line. In addition to the tunnel type liquid nitrogen freezer with high freezing capacity, our company also has cabinet type liquid nitrogen freezer suitable for small and medium-sized production, pure electric compressor refrigeration freezer, and quick freezing liquid freezer.

Why choose liquid nitrogen as the refrigerant?

Liquid nitrogen is non-toxic, a colorless, transparent, and low viscosity liquid. Its chemical properties are stable, with a boiling point of -196.5 ℃ at atmospheric pressure. It does not react chemically with frozen products and is inert to food ingredients. Liquid nitrogen meets food hygiene requirements and is an ideal food preservative. The nitrogen content in the air is 78%, making it an inexhaustible and environmentally friendly refrigerant. Furthermore, by replacing the air that comes out of food, oxidation changes can be minimized during freezing and packaging storage.

At standard atmospheric pressure, when liquid nitrogen absorbs heat and undergoes a phase transition to a gaseous state, it needs to absorb 199.29 KJ/KG of latent heat of vaporization, and then the low-temperature gas rising from -196.5 ℃ to -10 ℃ needs to absorb 202 KJ/KG of heat. Liquid nitrogen utilizes its ultra-low temperature heat absorption property to rapidly cool down, with a temperature difference of over 200 ℃. The intense heat exchange can cause frozen products to freeze instantly, forming a hard shell on the surface. The moisture inside the frozen products will not evaporate, resulting in an ultra-low drying rate of almost zero. Due to the extremely short freezing time of 5 to 10 minutes, which is 1/8 to 1/5 of the conventional freezing method, the ice crystals generated inside the frozen product are very fine and uniform, and the freezing speed is greater than the penetration speed of steam inside and outside the cell. Ice crystals are generated inside and outside the cell at the same time, without damaging the cell wall. Therefore, after thawing, the original color, aroma, taste, and freshness of the frozen product can be maintained. Liquid nitrogen quick freezing is currently one of the food quick freezing and preservation processes.

Tunnel type liquid nitrogen quick freezing machine - purpose

Tunnel type liquid nitrogen quick freezing machine is a large-scale quick freezing machine suitable for large-scale processing and production on factory assembly lines, with strong quick freezing ability; Easy to operate and highly automated. This series of liquid nitrogen quick freezing machines adopts new heating technology, temperature control technology, and liquid nitrogen dispersion technology to ensure uniform and stable temperature control, constant temperature control, and temperature reduction processes. Using liquid nitrogen as a refrigerant to meet cooling and environmental protection requirements. Quick freezing equipment comes in various specifications such as box type, cabinet type, tunnel type, etc., and can be designed and manufactured according to user requirements.

Freezing speed is fast. Compared with traditional air forced circulation freezing devices, the heat transfer intensity has increased by 30-40 times. This is because the thermal resistance during freezing decreases by 15-18 times, the heat release coefficient between the product surface and the cold air increases by 4-6 times, and the effective heat transfer area increases by 3.5-10 times. So the freezing speed is several tens of times faster than that of ordinary freezing devices. Due to its fast freezing speed, it can maintain the original nutritional content and freshness of food to a maximum extent.

Realize rapid freezing of individual units. After freezing, food will not stick together, achieving IQF freezing. Not only is the quality good, but it is also convenient for packaging and consumer consumption.

Food consumption is low. Each frozen food has a thin layer of ice film on its surface, which is beneficial for maintaining the freshness of the food and preventing oxidation, while also reducing dry consumption. Comparative experiments conducted by Swedish scholars on mushrooms, strawberries, etc. have shown that the dry consumption of liquid nitrogen freezing is almost only about half of that of forced air tunnel freezing. This is particularly important for higher priced foods.

Easy to achieve mechanization and automation for continuous production, with high production efficiency. Workers can operate at room temperature, improving working conditions.

Tunnel type liquid nitrogen freezer - Product advantages:

1. Short freezing time, quickly freezing within 5 to 10 minutes.

2. Low moisture loss, low cellular tissue damage, and maximum preservation of product texture, color, and taste.

3. Using liquid nitrogen as refrigerant, safe and environmentally friendly.

4. Easy to operate.