Centrifugal Separator Heavy Phase Recirculation Control
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Solution Overview
Problem
Existing centrifugal separators face challenges in maintaining consistent heavy component concentration and flow rate, especially when the content of the heavy component varies, which affects the quality and efficiency of the separation process.
Innovation Solution
The system incorporates multiple monitoring and control means, including PID and MPC controllers, to manage flow rates and pressures in the heavy component outlet channels, utilizing back pressure valves and recirculation mechanisms to maintain desired set points, ensuring consistent heavy component characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a centrifugal separator is used to separate light and heavy components, then separation efficiency is improved, but controlling the heavy phase flow rate and concentration becomes difficult when heavy component content varies
Solution Approach 1:
The system employs multiple monitoring means (first monitoring means for density/flow rate in second outlet channel, second monitoring means for flow rate in heavy component outlet pipes, third monitoring means for pressure in second outlet channel) that continuously measure parameters and feed this information back to control means. The control means adjust back pressure valves and recirculation pumps based on this feedback to maintain desired heavy phase flow rate and concentration despite variations in feed composition.
Solution Approach 2:
The system dynamically adjusts operating parameters through automated control. Back pressure valves (first back pressure valve in first outlet channel, second back pressure valve in second outlet channel) and recirculation pumps continuously modify their operation based on real-time monitoring data. This dynamic adjustment allows the system to adapt to varying heavy component content in the feed while maintaining consistent separation performance and heavy phase characteristics.
2Stability of the object's composition
If recirculation of heavy component is implemented, then consistent heavy component concentration is achieved, but system complexity increases
Solution Approach 1:
The recirculation pump serves multiple functions: it recirculates heavy component from the second outlet channel back to the separation chamber to maintain concentration consistency, and also helps control the overall heavy phase flow rate. The monitoring and control system provides multi-functional regulation by simultaneously managing density, flow rate, and pressure parameters through interconnected control of back pressure valves and recirculation flow.
Solution Approach 2:
The control means act as intermediaries between the monitoring means and the physical control elements (back pressure valves, recirculation pump). The monitoring means detect parameters, the control means process this information and generate control signals, and these signals adjust the valves and pumps accordingly. This intermediary control layer simplifies the overall system architecture by providing centralized intelligence that coordinates multiple components working together to achieve concentration consistency.
3Manufacturing precision
If multiple monitoring and control means are added, then flow rate and pressure control precision is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into specialized monitoring and control elements, each responsible for a specific parameter or function. The first monitoring means specifically monitors density and flow rate in the second outlet channel, the second monitoring means monitors flow rate in the heavy component outlet pipes, and the third monitoring means monitors pressure in the second outlet channel. Similarly, control functions are segmented: control means adjusts the first back pressure valve for light component flow control, adjusts the second back pressure valve for heavy component pressure control, and controls the recirculation pump for heavy component recirculation. This segmentation allows each component to be optimized for its specific function while working together as an integrated system.
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 effectively controls the heavy phase flow rate and pressure, maintaining consistent heavy component concentration and preventing clogging, thereby enhancing the separation process efficiency and output quality even with varying feed compositions.
Implementation Method 1
hermetic centrifugal separator, where the separator comprises a rotor including a separation chamber
Data Source
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AI summary
The present invention relates to a system comprising a hermetic centrifugal separator (1) where the separator comprises a rotor including a separation chamber (20), an inlet channel (2) for a mixture of components to be separated, a first outlet channel (4) for receiving at least one separated light component, and a second outlet channel (5) for receiving at least one separated heavy component. The system further comprises recirculation means (8) for recirculating from said second outlet channel (5) to said separation chamber (20) part of the separated heavy component, a first monitoring means (12) monitoring density, flow rate, or combination thereof, of the heavy component flowing in said second outlet channel (5), and a first control means (11, 15, 18) controlling recirculation flow rate in response to a control signal from said first monitoring means (12). The invention provides a system and method which control the characteristics of the separated heavy component even when feeding the separator with a feed of varying contents.