Retort Recirculation Circuit for Faster Uniform Cooling
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Solution Overview
Problem
Prior steam-water-spray retort systems face limitations in cooling capacity and efficiency, leading to uneven cooling and longer processing times due to reduced fluid flow during the cooling phase, which can result in temperature differences within the load and require larger pumps and heat exchangers, increasing complexity and overpressure needs.
Innovation Solution
The improved steam-water-spray retort system separates the heat exchanger from the main recirculating fluid circuit and uses a dedicated pump for the heat exchanger, allowing for a higher flow rate and lower pressure drop, enabling more homogeneous processing and faster cooling without the need for larger pumps or modifications to the retort vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single pump is used to recirculate process fluid through the heat exchanger during the cooling phase, then the system complexity is reduced, but the cooling capacity and flow rate are insufficient leading to uneven cooling and longer processing times
Solution Approach 1:
The recirculation circuit is divided into two separate circuit portions: a first circuit portion that recirculates process fluid through the heat exchanger during the cooling phase, and a second circuit portion that recirculates process fluid during the come-up and cook phases. This segmentation allows each circuit to be optimized for its specific function, with the first circuit having higher flow rate and lower pressure drop for efficient cooling.
Solution Approach 2:
The system dynamically switches between different circuit configurations based on the processing phase. During the cooling phase, the first circuit portion is activated with a dedicated pump for high flow rate through the heat exchanger. During come-up and cook phases, the second circuit portion is activated. This dynamic adaptation optimizes performance for each phase without requiring a single oversized pump.
2Productivity
If the process fluid flow rate is reduced during the cooling phase, then the pump size and heat exchanger size can be reduced, but the cooling becomes uneven and processing time increases
Solution Approach 1:
The recirculation circuit is segmented into two separate portions with different flow characteristics. The first circuit portion is specifically designed for the cooling phase with higher flow rate capabilities, while the second circuit portion handles the heating phases. This segmentation ensures that each phase receives the appropriate flow rate for optimal performance.
Solution Approach 2:
The system changes the flow rate parameter dynamically based on the processing phase. During the cooling phase, the first circuit portion operates at a higher flow rate to ensure rapid and uniform cooling. During come-up and cook phases, the second circuit portion operates at a lower flow rate. This parameter change optimizes both cooling speed and temperature uniformity without requiring oversized equipment for all phases.
3Productivity
If a larger pump is used to increase flow rate during the cooling phase, then the cooling capacity improves, but the Net Positive Suction Head required increases and overpressure needs increase
Solution Approach 1:
The recirculation system is segmented into two separate circuit portions, each with its own pump characteristics optimized for specific phases. The first circuit portion uses a pump sized appropriately for cooling phase requirements, while the second circuit portion uses a pump sized for heating phases. This segmentation avoids the need for a single large pump that would require high NPSH and create excessive overpressure.
Solution Approach 2:
Instead of using a single large pump that copies the function of both heating and cooling circulation, the system creates two separate circuit portions with pumps sized for their specific functions. This copying approach allows each pump to be optimized for its phase without the compromises required by a single oversized pump.
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 configuration increases the total fluid flow through the retort, reduces temperature differences within the load, and lowers the required overpressure, resulting in more efficient and uniform cooling, while maintaining flexibility in heat exchanger selection and reducing the Net Positive Suction Head required for the pump.
Implementation Method 1
a heat exchanger in fluid communication with the first pump
Implementation Method 2
A second recirculation circuit portion is configured to recirculate a second portion of the process fluid through the vessel. The second recirculation circuit portion includes a second pump having a second flow rate higher than the first flow rate and a second output pressure lower than the first output pressure.
Data Source
AI summary
A recirculation circuit for a processing vessel is configured to process a load with a process fluid. The recirculation circuit includes a first circuit portion configured to recirculate a first portion of the process fluid through the vessel. The first circuit portion includes a first pump having a first flow rate and a first output pressure and a heat exchanger in fluid communication with the first pump. A second circuit portion is configured to recirculate a second portion of the process fluid through the vessel. The second circuit portion includes a second pump having a second flow rate higher than the first flow rate and a second output pressure lower than the first output pressure.