Multiple-Capacity Centrifugal Compressor Control for Surge Suppression
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Solution Overview
Problem
Traditional multiple-capacity centrifugal compressors face challenges in achieving wide-range operations and satisfying partial-load requirements due to limited control strategies and low flexibility, resulting in reduced system efficiency and increased surges.
Innovation Solution
A multiple-capacity centrifugal compressor system with multiple capacity-control mechanisms, each comprising an inlet guide vane and an outlet diffuser, is controlled by a system that calculates pressure ratios and adjusts the vanes and diffusers based on determined priorities to optimize aperture and operation range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional multiple-capacity control methods are used with single inlet guide vane and single diffuser, then the control structure is simple, but the operation range is limited and partial-load performance is poor
Solution Approach 1:
The patent divides the single capacity-control mechanism into multiple independent mechanisms, each with its own inlet guide vane and diffuser. This segmentation allows each mechanism to operate independently within specific capacity ranges, enabling wide-range operations while maintaining simple control logic for each individual mechanism.
Solution Approach 2:
The patent implements dynamic switching between multiple capacity-control mechanisms based on real-time operating conditions. The controller dynamically determines which mechanism to activate or deactivate, allowing the system to adapt to varying load requirements and maintain optimal performance across the entire operation range.
2Use of energy by moving object
If sequential adjustment of capacity-control mechanisms is used, then the control logic is simple, but the COP performance is limited and partial-load requirements are not satisfied
Solution Approach 1:
The patent incorporates feedback mechanisms where the controller continuously monitors operating conditions and adjusts the active capacity-control mechanism accordingly. This feedback loop enables the system to maintain optimal COP performance by selecting the most efficient mechanism for current operating conditions, rather than following fixed sequential adjustment patterns.
Solution Approach 2:
The patent changes the operational parameters (pressure ratios, capacity ratios) of multiple mechanisms simultaneously or selectively based on real-time conditions. This allows the system to optimize COP performance across partial-load operations by adjusting parameters dynamically rather than following predetermined sequential increments or decrements.
3Productivity
If fixed increment/decrement adjustment is used, then the control implementation is simple, but the load control proportionality is poor and system efficiency is reduced
Solution Approach 1:
The patent replaces fixed increment/decrement adjustment with dynamic, proportional adjustment of multiple capacity-control mechanisms. The controller calculates appropriate capacity ratios and pressure ratios for each active mechanism based on current operating conditions, enabling proportional load control that maintains system efficiency across varying loads.
Solution Approach 2:
The patent creates a universal control framework that can handle multiple operating conditions and load requirements simultaneously. The controller universally applies the same control logic across all capacity-control mechanisms, coordinating their operation to achieve proportional load control and maintain high system efficiency regardless of the specific operating point.
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 enables proportional load control, enhances system efficiency, and allows for wide-range operations while suppressing surges, significantly improving the compressor's performance and reliability.
Implementation Method 1
each capacity-control mechanism includes an inlet guide vane and an outlet diffuser
Implementation Method 2
Multiple-capacity centrifugal compressor including: a plurality capacity-control mechanisms respectively having an inlet guide vane and an outlet diffuser
Data Source
AI summary
The present disclosure relates to a multiple-capacity centrifugal compressor, which includes a plurality of capacity-control mechanisms. Each of the capacity-control mechanisms includes an inlet guide vane and an outlet diffuser, so that the multiple-capacity centrifugal compressor provides a flexible control strategy. In addition, the present disclosure further provides a method for controlling the multiple-capacity centrifugal compressor that effectively adjusts and controls the capacity-control mechanisms by coarsely adjusting the inlet guide vanes and combined with subsequently adjusting the outlet diffusers.