Controlling the thermal differential in protein fluids directly determines plant operational availability and fouling prevention.
In the egg products industry and the production of functional ingredients, processing proteins under the criteria of industrial fluid thermal treatment represents one of the most complex engineering challenges. A paradigmatic example is egg white hydrolysate, a high-value-added fluid whose viscosity and functionality depend critically on rigorous temperature management during processing.
Faced with this challenge, Perinox has designed, built, and commissioned an automated line for the production of egg white hydrolysate for a food sector company in Spain. This project addresses the standards of efficiency and product care within the field of industrial fluid thermal treatment.
The Operational Challenge: Preserving Protein Integrity in a Complex Fluid
The client required an industrial installation capable of processing protein hydrolysates while ensuring strict microbiological lethality, but with a critical technical constraint: the fluid could not be subjected to severe thermal shocks.
Traditional heat exchange systems often operate with high temperature differentials between the service fluid and the product. In streams with a high protein concentration, this translates into protein coagulation on the transfer surface, drastically reducing the plant’s operational cycle due to constant shutdowns caused by fouling.
Furthermore, the plant had to be versatile enough to adapt precisely to the specific requirements of different thermal profiles depending on the batch or formulation.
Mitigating Fouling Through Thermal Differential Control and Flexible Profiles
To respond to these engineering specifications, a solution was developed based on a continuous product pasteurizer adapted for different thermal profiles. The technological pillar of this equipment lies in the thermodynamic co-design of the system, which pays special attention to preserving product quality by minimizing the temperature approach during the critical heating stages.
By operating with a minimum differential between the heating fluid and the egg white hydrolysate, homogeneous and progressive heat transmission is achieved. This consultative engineering approach prevents surface thermal polarization and mitigates fouling, keeping the functional properties of the egg white proteins stable.
The key features of the processing line include:
- Thermal Adaptability: Ability to accurately configure and execute different pasteurization profiles adapted to the nature of each batch.
- Optimized Fluid Dynamics: Selection of exchange geometries that ensure an ideal flow regime, minimizing pressure drops and guaranteeing a homogeneous holding time in the holding tube.
- Integrated Thermal Efficiency: Maximization of energy recovery between the hot and cold product streams, reducing the net demand for auxiliary services and optimizing the overall energy balance of the factory.
Automation and Control of Critical Variables
The key to the continuous pasteurizer executing these thermal profiles with total repeatability is the integration of advanced systems for industrial process automation. The automated line by Perinox monitors and governs the essential variables of the process:
- Temperature Difference Control: The system automatically regulates the parameters of the service fluids to ensure that the differential temperature is strictly kept below the protein coagulation threshold.
- Thermal Profile Management: Allows recording and applying the exact temperature profiles required for each batch, ensuring compliance with food safety regulations.
- Operational Flexibility: The centralized system makes it easy for operators to safely switch between different pre-programmed thermal regimes according to the product formulation.
Technical Conclusion: Validation of Thermal and Rheological Balance
The commissioning of this process line demonstrates that the key to processing complex proteins is eliminating hot spots in the heat exchanger. By working with a minimum temperature difference controlled by automation, three clear technical objectives are achieved:
- Product Protection: The hydrolysate maintains its original structure and viscosity without undergoing premature denaturation on the equipment walls.
- Continuous Operation: Since no crusts are generated by coagulation (fouling), the heat transfer coefficients remain stable, and unscheduled shutdowns due to clogging are avoided.
- Repeatability: Automatic loops guarantee that each batch receives exactly the same thermal treatment, ensuring food safety without sacrificing overall performance.
