Blast Freezer

An ammonia blast freezer is a high-performance industrial freezer that uses ammonia (NH₃) as the refrigerant to rapidly freeze products (typically to -18°C or lower) by blowing extremely cold air at high velocity over them. It is commonly used in food processing plants to preserve product quality, texture, and safety.

 

Key Features of Ammonia Blast Freezers:

1. Ammonia as Refrigerant

• Natural and eco-friendly (ODP = 0, GWP = 0)

• Excellent thermodynamic properties for efficient heat removal

• Suitable for large-scale, high-capacity freezing operations

2. Rapid Freezing

• Blast freezing brings the product temperature from +70°C to -18°C within a few hours

• Minimizes formation of large ice crystals, preserving texture, taste, and appearance

3. High-Velocity Cold Air

• Equipped with powerful axial or centrifugal fans that blow air at -30°C to -40°C

• Air circulates at high speed across the surface of the product, ensuring uniform freezing

4. Batch or Tunnel Configuration

• Batch-type blast freezer: Products are placed on trolleys or racks inside a chamber

• Tunnel blast freezer: Products move continuously on a conveyor belt through the freezing zone

5. Temperature Uniformity

• Ensures consistent freezing throughout the product, including the core

• Prevents partial or uneven freezing

6. Energy Efficiency

• Ammonia systems offer low running costs due to superior energy efficiency

• Insulated chambers reduce heat gain and minimize energy loss

7. Stainless Steel Construction

• Interior often made with stainless steel for durability and food safety

• Easy to clean and maintain, compliant with hygiene standards

8. Customizable Capacity

• Can be tailored to freeze anywhere from a few hundred kilograms to several tons per day

• Suited for various product types (meat, poultry, seafood, bakery, fruits, etc.)

9. Integrated Safety Features

• Ammonia systems are equipped with:

  • Leak detection sensors

  • Emergency shutdown valves

  • Ventilation systems

  • Pressure relief mechanisms

Carton Freezer / Box Freezer