Cryogenic Spray System for Fish Freezing Tunnels

Product Specifications

Technical details and manufacturing context for Cryogenic Spray System

Definition

The Cryogenic Spray System is a critical component of the Automated Cryogenic Fish Freezing Tunnel System, responsible for the precise and uniform application of liquid nitrogen or other cryogenic fluids onto fish products as they pass through the freezing chamber. This system ensures rapid heat extraction, minimizing ice crystal formation and preserving product quality, texture, and nutritional value during the freezing process. The system operates with pressurized nozzles that atomize the cryogen into a fine mist, which is directed onto the fish products moving on a conveyor. Upon contact, the cryogen evaporates, absorbing latent heat and causing immediate surface freezing. Control systems regulate spray pressure, flow rate, and nozzle patterns to achieve consistent freezing across different product types and throughputs. The system is constructed from materials suitable for cryogenic service, including stainless steel (AISI 316L), cryogenic-resistant polymers (PTFE, PEEK), and copper alloys for heat exchangers and nozzle internals. Key parameters include an operating pressure of 1.0–1.6 MPa, a spray flow rate of 5–20 L/min per nozzle, a nozzle count of 12–48 depending on tunnel width, a spray angle of 60–120 degrees, an operating temperature range of -40 to 85 °C, and a cryogenic fluid temperature of -196 °C (liquid nitrogen). Electrical supply is 24 V DC ±10% (per IEC 61131-2), control precision is ±0.1 s, material is 316L stainless steel (per ASTM A240), ingress protection is IP65–IP67 (per IEC 60529), and weight ranges from 50–150 kg per module. These values are reference ranges and must be verified for the specific model and application. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The system uses pressurized nozzles to atomize liquid cryogen (typically liquid nitrogen at -196°C) into a fine mist or spray. This spray is directed onto fish products moving on a conveyor. Upon contact, the cryogen rapidly evaporates, absorbing latent heat from the fish and causing immediate surface freezing. The system is controlled to regulate spray pressure, flow rate, and nozzle patterns to achieve consistent freezing across different product types and throughputs.

Common Materials

Stainless Steel (AISI 316L), Cryogenic-resistant polymers (PTFE, PEEK), Copper alloys (for heat exchangers/nozzle internals)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Spray Flow Rate	5–20 L/min	Per nozzle; adjust for product throughput
Nozzle Count	12–48 pcs	Depends on tunnel width and coverage
Spray Angle	60–120 °	Full cone; ensure uniform coverage
Operating Temperature	-40–85 °C	For components; cryogenic fluid at -196°C
Cryogenic Fluid Temperature	-196 °C	Liquid nitrogen; keep below -150°C
Electrical Supply	24 ±10% V DC	For solenoid valves and sensorsIEC 61131-2
Control Precision	±0.1 s	Valve response time for dosing
Material	316L SS	Cryogenic-compatible stainless steelASTM A240
Ingress Protection	IP65–IP67	Washdown and condensation resistantIEC 60529
Weight	50–150 kg	Per module; varies with nozzle count

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Spray Nozzle Array
Atomizes and directs the cryogenic fluid onto the product surface

Material: Stainless Steel 316L with PTFE seals
Manifold Distribution Block
Evenly distributes cryogenic fluid from the main supply line to individual nozzles

Material: Stainless Steel 316L
Solenoid Control Valves
Precise on/off control of fluid flow to each nozzle or nozzle group

Material: Brass body with cryogenic-rated seals
Pressure Regulator
Maintains consistent fluid pressure at the nozzle inlet for uniform spray characteristics

Material: Stainless Steel 316L

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Frequently Asked Questions

What is the typical operating pressure range for this cryogenic spray system?

The operating pressure is listed as 1.0–1.6 MPa. Always verify the exact pressure requirements for your specific model and application with the manufacturer.

What materials are used in the construction of this system?

The system is made from stainless steel (AISI 316L), cryogenic-resistant polymers such as PTFE and PEEK, and copper alloys for heat exchangers and nozzle internals. These materials are selected for cryogenic service and durability.

How does the system ensure uniform freezing of fish products?

The system uses a controlled spray pattern with adjustable nozzle count (12–48), spray angle (60–120°), and flow rate (5–20 L/min per nozzle) to achieve even coverage. The control system regulates pressure and flow to adapt to different product types and throughputs.

What are the electrical and environmental specifications?

The electrical supply is 24 V DC ±10% per IEC 61131-2, and the ingress protection rating is IP65–IP67 per IEC 60529, making it resistant to washdown and condensation. These specifications should be confirmed for your specific installation.

Data Basis

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pressure:	Up to 10 bar (145 psi) maximum operating pressure
flow rate:	5-50 L/min per nozzle (adjustable)
temperature:	-196°C to -40°C (liquid nitrogen range)
slurry concentration:	Up to 30% solids in cryogenic fluid mixture

Cryogenic Spray System

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