I. Preparation Before Installation

 

1. Site Selection

• • • Choose a well-ventilated, dry, flat area with sufficient load capacity to install the liquid nitrogen freezer. Avoid damp, high-temperature, or corrosive environments.
    • Ensure there is enough space around the site for operating, maintaining the equipment, and storing and transporting liquid nitrogen.

2. Equipment Inspection

• • • Before installation, carefully check all parts of the liquid nitrogen quick freezing machine to ensure they are undamaged and complete, with no transport-related damage.
    • Verify that the equipment's model, specifications, and technical parameters match the purchase contract.

3. Tools and Materials Preparation

• • • Prepare the necessary installation tools, such as wrenches, screwdrivers, and pliers.
    • Gather required installation materials, including sealants, washers, and cables.

4. Safety Gear Preparation

• • • Installers should wear appropriate safety gear, such as hard hats, protective gloves, and safety goggles.

 

II. Installation Steps

 

1. Positioning the Equipment

• • • Carefully place the liquid nitrogen quick freezing equipment at the selected site using lifting equipment or a forklift, ensuring it is level and stable.

2. Connecting the Liquid Nitrogen Supply Line

• • • Connect the liquid nitrogen supply line to the equipment's nitrogen inlet, using suitable seals to ensure a tight, leak-free connection.
    • Before connecting the line, make sure the inside is clean and free of debris.

3. Electrical Connections

• • • Follow the electrical schematic to connect the power cable to the equipment's power interface.
    • Ensure the electrical connections are secure, properly grounded, and meet safety standards.

4. Installing the Ventilation System

• • • If the equipment requires a ventilation system, install it according to the provided instructions to ensure proper airflow and the timely removal of nitrogen gas produced during operation.

5. System Testing

• • •  After completing the installation steps, conduct system testing.
    • Check that all connections are secure and that there are no loose parts.
    • Test the electrical system to ensure it functions correctly.
    • Test the liquid nitrogen supply and freezing system to check the freezing performance and nitrogen usage.

III. Post-Installation Inspection and Acceptance

 

• Visual Inspection: Check the equipment for any damage, deformation, or paint peeling.
• Leak Check: Use a leak detector or soapy water to check the nitrogen supply line and other connections for leaks, ensuring there are none.
• Operational Testing: Run the equipment for a while to observe its operation, including temperature control, pressure readings, and operational sounds.
• Performance Acceptance: Based on the technical parameters and performance indicators, verify the freezing speed and effectiveness to ensure the equipment meets usage requirements.

IV. Precautions

 

• Follow the installation manual and relevant standards strictly during the installation process; do not change steps or methods without approval.
• Installers should have the necessary professional knowledge and skills, familiar with the installation process and safety precautions for liquid nitrogen freezers.
• If any issues or abnormalities arise during installation or testing, stop work immediately, investigate the cause, and resolve the issue before continuing.
• After installation, provide users with a detailed operating and maintenance manual and offer necessary training.

 

SPEEDCRYO provides on-site installation services, including:

• Site inspection, planning, and technical proposal services before equipment purchase;
• On-site installation, debugging, and trial operation guidance after equipment arrival;
• On-site operation guidance;
• Guidance for installing liquid nitrogen tanks and pipelines;
• Guidance for exhaust pipe installation for the liquid nitrogen freezer.
  
  

If you need our professionals to provide site planning services before purchasing, feel free to contact us; it’s completely free!

As one of the most advanced freezing technologies in modern food industries, liquid nitrogen freezing is renowned for its rapid freezing capability and efficient preservation effects. It has become widely adopted in the processing and preservation of various food types. Compared to traditional freezing methods, liquid nitrogen freezing achieves rapid temperature reduction, preserving the nutritional content, texture, and appearance of food to the greatest extent.

However, not all food types are suitable for freezing in liquid nitrogen quick freezing equipment. The ultra-low temperature of liquid nitrogen enables rapid freezing, but for certain foods, this speed may lead to texture changes, flavor loss, or other undesirable effects. Understanding which foods are appropriate for liquid nitrogen freezing is essential for achieving optimal results and maintaining food quality.

I. Principles of Liquid Nitrogen Freezing

Liquid nitrogen freezing relies on the immense cooling energy released during nitrogen gasification. Liquid nitrogen operates at an extremely low temperature of approximately -196°C. When food comes into contact with liquid nitrogen, the temperature drops almost instantly, causing the moisture within the food to freeze rapidly and form small, uniform ice crystals.

This rapid freezing process prevents water within the food's cells from forming large ice crystals, thereby avoiding cell damage. As a result, liquid nitrogen freezing effectively preserves the structure and nutrition of the food while maintaining its original texture and flavor by preventing dehydration or undesirable flavor changes during the freezing process.

 

II. Foods Suitable for Liquid Nitrogen Freezing

       1. Seafood

Seafood is a classic application for liquid nitrogen freezing technology. Seafood contains high water content, which, under traditional freezing methods, forms large ice crystals that damage cellular structures, affecting texture and taste. Liquid nitrogen freezing eliminates this issue by maintaining the original freshness of seafood.

Suitable Seafood Types: Fish (e.g., salmon, tuna), shellfish (e.g., clams, oysters), shrimp, crab, and more. Liquid nitrogen freezing helps retain seafood's fresh taste while reducing flavor changes during freezing.

 

       2. Fruits and Vegetables

Fruits and vegetables, with their high water content and delicate cell walls, are prone to texture and taste degradation under traditional freezing methods. The rapid freezing of liquid nitrogen minimizes ice crystal formation, preserving their original shape and texture.

Suitable Fruits and Vegetables: Durian, blueberries, raspberries, cauliflower, green beans, corn, carrots, etc. This method not only retains the color and flavor of these items but also extends shelf life and prevents nutrient loss over time.

 

       3. Meat and Poultry

Liquid nitrogen freezing offers significant advantages for meat and poultry. Traditional freezing may cause the formation of large ice crystals, leading to a loss of moisture and tenderness. Liquid nitrogen freezing quickly freezes meat and poultry, minimizing cellular rupture and maintaining juiciness and texture.

Suitable Meat and Poultry Types: Beef, lamb, pork, chicken, duck, etc. It is particularly effective for premium cuts requiring long-term storage.

       4. Dairy Products

Liquid nitrogen freezing is also suitable for many dairy products, especially those requiring the retention of creamy textures and original flavors. Rapid freezing ensures the preservation of dairy's rich aroma and smooth consistency.

Suitable Dairy Products: Ice cream, cheese, milk, yogurt, etc. This technique enhances the texture and flavor of dairy items while preserving their nutritional components.

 

       5. Pastries and Desserts

Many pastries and desserts benefit from liquid nitrogen freezing, which effectively maintains their shape and texture. It is particularly useful for high-end pastry production where precise texture and appearance are critical.

Suitable Pastries and Desserts: Ice cream cakes, mousse, brownies, puffs, and more. Liquid nitrogen freezing stabilizes these items during freezing and thawing, preserving their original structure and taste.

 

       6. Ready-to-Eat and Pre-Processed Foods

For ready-to-eat and pre-processed foods, liquid nitrogen freezing significantly enhances freezing efficiency while maintaining freshness. Frozen convenience foods like pizzas, dumplings, and soups retain their flavor and nutritional value.

Suitable Ready-to-Eat Foods: Frozen pizzas, dumplings, soups, instant rice, etc. This method extends shelf life and prevents quality deterioration during thawing.

III. Foods Unsuitable for Liquid Nitrogen Freezing

Despite its versatility, liquid nitrogen freezing is not suitable for all food types. Certain foods may suffer adverse effects during the freezing process:

1. Low-Moisture Foods: Items like nuts and dried fruits may experience texture changes or flavor degradation.
2. High-Fat Foods: Foods with high fat content (e.g., certain creams or fried items) may develop undesirable textures due to fat solidification at ultra-low temperatures.
3. Complex Structured Foods: Multi-layered items (e.g., layered pastries) may experience separation or deformation due to uneven freezing and thawing.
   
   

IV. Future Trends in Liquid Nitrogen Freezing

As cold chain logistics advance and liquid nitrogen freezing technology continues to innovate, its applications in the food industry will expand. With improvements in technology and reductions in equipment costs, liquid nitrogen freezing is expected to become a more efficient and eco-friendly freezing solution. It offers significant advantages in enhancing food safety, extending shelf life, and maintaining food quality.

 

The rapid freezing characteristics of liquid nitrogen make it ideal for preserving high-quality, fresh foods, including seafood, meats, fruits, vegetables, dairy products, and pastries. However, careful consideration is required for foods with unique properties. As technology evolves, liquid nitrogen freezing will play an increasingly important role in food processing and preservation, helping the food industry improve efficiency, reduce waste, and meet growing consumer demands.