Prill Head Pressure Control via Axial Upflow Mixing
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Solution Overview
Problem
Maintaining consistent pressure at the prill plate during the prilling process is challenging due to factors like the viscous nature of liquids or slurries, limitations in level sensor resolution and control, and variations in flow rates, leading to inconsistent prill quality and size distribution.
Innovation Solution
The method involves dynamically controlling the pressure at the prill head by regulating the pressure of the gas or vapor in the headspace above the liquid or slurry using a pressure regulating device, and employing an axial upflow mixing element to maintain precise control of the pressure at the prill plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If liquid level control methods are used to maintain pressure at the prill plate, then pressure control is achieved, but prill quality consistency deteriorates due to small level changes having profound effects
Solution Approach 1:
An axial upflow device is introduced as an intermediary mechanism between the liquid supply and the prill plate. This device creates an upward flow that counteracts the downward pressure from the liquid column, providing a buffer that decouples small liquid level fluctuations from the actual pressure at the prill plate, thereby maintaining consistent prill quality
Solution Approach 2:
The invention changes the control parameter from liquid level height to axial upflow rate. By controlling the upflow rate rather than the liquid level, the system can maintain stable pressure at the prill plate even when liquid level varies, as the upflow compensates for pressure variations caused by level changes
2Quantity of substance
If excess liquid or slurry is supplied to the prill head to maintain consistent supply, then supply consistency is improved, but pressure control precision deteriorates due to fluctuations in the excess supply
Solution Approach 1:
The axial upflow device serves as a buffer zone that absorbs fluctuations from the excess liquid supply. The upflow creates a controlled circulation pattern that smooths out variations in supply rate, allowing the system to maintain both adequate supply quantity and precise pressure control at the prill plate
3Stability of the object's composition
If the liquid or slurry is highly viscous, then material properties are maintained, but pressure control becomes more difficult due to viscous resistance
Solution Approach 1:
The axial upflow device utilizes hydraulic principles to create an upward current through the viscous liquid or slurry. This hydraulic upflow reduces the effective viscosity resistance by creating circulation patterns that prevent stagnant zones and reduce overall flow resistance, making pressure control easier while maintaining the material's compositional stability
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 results in a more consistent pressure at the prill plate, enhancing the quality and narrowing the size distribution of the prills produced.
Implementation Method 1
employing an axial upflow mixing element to maintain precise control of the pressure at the prill plate
Implementation Method 2
regulating the pressure of the gas or vapor in the headspace above the liquid or slurry
Data Source
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AI summary
Methods and apparatus for prilling are provided which include dynamically controlling the pressure at the prill head for increased control over prill quality and size distribution. In one embodiment, the pressure of a headspace above a volume of liquid or slurry is regulated to maintain a more precise control of the pressure of the liquid or slurry at the prill head. In another embodiment, an axial upflow device is used to maintain a more precise control of the pressure of the liquid or slurry at the prill head.