Sugar Crystallization Control via Supersaturation Feedback
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Solution Overview
Problem
High supersaturation during sugar crystallization leads to the formation of conglomerates and fines, increasing production costs and complicating crystal separation due to varying crystal sizes, which existing methods fail to effectively control by relying on overall sugar processing sub-system inventory conditions rather than the dynamic characteristics of the mother liquor.
Innovation Solution
A closed-loop method and system for controlling sugar crystallization by determining supersaturation based on the characteristics of the mother liquor, regulating syrup influx, and adjusting temperature to maintain supersaturation within a threshold, using a batch crystallization controller with sensors and model predictive controls to ensure uniform crystal size and increased yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high supersaturation is allowed during sugar crystallization, then sugar yield increases, but crystal size uniformity deteriorates and conglomerates/fines form
Solution Approach 1:
The system continuously measures supersaturation using a refractometer and feeds this information back to the control system, which automatically adjusts syrup feed rate and evaporation rate to maintain supersaturation within the optimal range, resolving the contradiction between maximizing yield and maintaining crystal uniformity
Solution Approach 2:
The system dynamically changes the supersaturation parameter by controlling syrup feed rate and evaporation rate based on real-time measurements, keeping supersaturation between 1.01-1.05 to prevent conglomerate formation while maximizing crystal growth and yield
2Productivity
If high supersaturation is maintained, then sugar production efficiency improves, but separation difficulty increases due to varied crystal sizes
Solution Approach 1:
Real-time supersaturation measurement and feedback control ensures crystals grow at a controlled rate with uniform size, making them easier to separate during centrifugation while maintaining high production efficiency
3Device complexity
If conventional inventory-based control is used, then system complexity remains low, but supersaturation control precision is insufficient
Solution Approach 1:
The system replaces conventional mechanical/inventory-based control with automated optical measurement (refractometer) and electronic feedback control, achieving precise supersaturation control while keeping the overall system relatively simple through the use of standard instrumentation
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 allows for the formation of uniformly sized crystals, enhancing sugar yield and efficiency by accurately modeling and controlling supersaturation, facilitating easier centrifugation and reducing production costs.
Implementation Method 1
A refractometer may be used to determine the supersaturation of the mother liquor
Implementation Method 2
sugar crystals may be formed in a sugar processing sub-system (e.g., a vacuum pan) when a sugar solution
Implementation Method 3
sugar processing sub-system (e.g., a vacuum pan)
Implementation Method 4
regulating influx of syrup into the sugar slurry and the temperature of the sugar slurry
Data Source
AI summary
The embodiments described herein include one embodiment that provides a method for controlling sugar crystallization. The method includes, during a crystallization process, determining supersaturation of a sugar slurry of syrup and regulating influx of syrup into the sugar slurry to promote sugar crystallization in a closed-loop manner based upon the determined supersaturation.