Egg Pasteurization PLC Control for Salmonella Reduction
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Solution Overview
Problem
Current shell egg pasteurization systems face challenges in uniformly heating eggs of different sizes and starting temperatures, leading to potential overheating and compromised egg quality, while lacking data acquisition and reporting capabilities to verify compliance with pasteurization protocols.
Innovation Solution
A programmable logic controller (PLC) is used to control temperature and dwell time in a pasteurization system, employing PID algorithms and independently controlled heating elements to maintain optimized pasteurization conditions for various egg sizes and temperatures, along with data acquisition and reporting to ensure compliance with statistically verified protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eggs are heated to achieve sufficient pasteurization temperature for salmonella reduction, then food safety is improved, but egg quality and functionality may deteriorate due to overheating
Solution Approach 1:
The pasteurization process is divided into multiple temperature zones (first zone for initial heating, second zone for pasteurization, third zone for cooling) with each zone having independently controlled heating elements. This segmentation allows precise temperature control at different stages, ensuring salmonella reduction while preventing overheating damage to egg quality.
Solution Approach 2:
The system dynamically adjusts temperature parameters across different zones and time periods. The controller modifies heating element output based on real-time temperature feedback from multiple sensors, maintaining optimal temperature ranges for pasteurization effectiveness while preserving egg functionality and preventing quality deterioration.
2Ease of manufacture
If uniform heating is applied to all eggs in a batch, then processing simplicity is improved, but eggs of different sizes and starting temperatures cannot be adequately pasteurized without compromising quality
Solution Approach 1:
Different regions of the pasteurization chamber (first zone, second zone, third zone) are assigned different temperature characteristics and heating intensities. The controller applies localized temperature control tailored to the specific heating requirements of eggs at different stages of the process, accommodating variations in egg size and starting temperature while maintaining uniform quality outcomes.
Solution Approach 2:
The system transitions from static uniform heating to dynamic adaptive heating. The controller continuously monitors temperature distribution and adjusts heating element output in real-time based on feedback from multiple temperature sensors, enabling the system to adapt to varying egg characteristics and maintain effective pasteurization across the entire batch.
3Manufacturing precision
If multiple temperature zones with independent control are implemented, then pasteurization precision is improved, but system complexity increases
Solution Approach 1:
Each temperature zone is equipped with sensors that continuously monitor local temperature conditions and feed this information back to the controller. The controller uses this feedback to automatically adjust heating element output, maintaining precise temperature control across all zones without requiring complex manual intervention or oversight.
Solution Approach 2:
The system is designed to automatically regulate its own temperature distribution across multiple zones. The controller independently manages each heating element based on sensor feedback, enabling the system to self-correct temperature deviations and maintain optimal pasteurization conditions without external intervention, thereby managing complexity through automation.
4Loss of information
If real-time data acquisition and reporting systems are added, then compliance verification is improved, but system complexity and cost increase
Solution Approach 1:
The existing controller that manages temperature zones is extended to also perform data acquisition, monitoring, and compliance reporting functions. This multi-functional approach allows the system to gather real-time temperature data, verify pasteurization compliance, and generate reports without adding separate dedicated hardware systems, thereby managing complexity through functional integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures effective pasteurization that meets FDA standards for salmonella reduction without affecting egg quality, while providing real-time data for batch verification and compliance reporting, enhancing system throughput and egg quality preservation.
Implementation Method 1
a first, second and third heating element respectively located in a first, second and third zone of the pasteurization bath and independently controlled by a programmable logic controller to heat the fluid pasteurization medium
Implementation Method 2
the purpose of the process is to heat the entire mass of the egg such that the center of the egg yolk warms to an adequate temperature for a sufficient amount of time to pasteurize the egg
Data Source
AI summary
A batch processing control system for a shell egg pasteurizer controls the time and temperature in which batches of shell eggs are held in a pasteurization bath in accordance with a predetermined pasteurization protocol for designated egg size and start temperature. The predetermined pasteurization protocol is preferably statistically verified to optimize batches of eggs having the designated size and start temperature. The system also includes reporting software that generates daily reports to track each respective batch and verify that the batch has been pasteurized according to the statistically verified protocol.