Variable Speed Centrifugal Compressor Cycle Time Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cyclic adsorption processes using traditional positive displacement machines are inefficient due to high energy wastage and susceptibility to adverse operating conditions like surge and stonewall when rapid pressure changes occur, limiting the adoption of more efficient centrifugal compressors.
Innovation Solution
Implementing variable speed centrifugal compressors with adjusted cycle times to minimize stonewall conditions and maximize efficiency, ensuring the cycle time is greater than the ratio of inertial energy to 0.3 times the total power consumption, thereby optimizing the operation of centrifugal machines in cyclic adsorption processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional positive displacement machines are used in cyclic adsorption processes, then the system can operate with simple fixed-speed mechanisms, but energy wastage increases and power efficiency decreases
Solution Approach 1:
The patent applies variable speed control to centrifugal compressors, allowing the rotational speed to be dynamically adjusted during different phases of the cyclic adsorption process. This enables the compressor to operate at optimal speeds for each process stage (pressurization, depressurization, purge), maximizing energy efficiency while maintaining operational simplicity through automated control systems.
2Loss of energy
If centrifugal compressors are used with rapid pressure changes, then power efficiency improves, but stonewall conditions occur more frequently
Solution Approach 1:
The patent implements variable speed control as a key parameter change, allowing the centrifugal compressor to adjust its rotational speed in response to changing pressure conditions. By reducing speed during rapid pressure changes and maintaining optimal speed during stable phases, the system achieves high power efficiency while avoiding stonewall conditions that would compromise reliability.
3Productivity
If cycle time is reduced to increase productivity, then more cycles can be completed per unit time, but compressor power consumption increases due to frequent acceleration and deceleration
Solution Approach 1:
The patent employs periodic variable speed operation synchronized with the cyclic adsorption process. The compressor speed is periodically adjusted to match the process requirements: higher speeds during pressurization and purge phases, and reduced speeds during depressurization. This periodic action pattern allows multiple cycles per unit time while minimizing the energy penalty of acceleration and deceleration.
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 reduces energy wastage and enhances the power efficiency of centrifugal machines, making them a viable replacement for traditional machines by minimizing stonewall occurrences and achieving energy savings up to 30% compared to rotary lobe blowers.
Implementation Method 1
centrifugal machines operating under cyclic acceleration and deceleration conditions
Implementation Method 2
cyclic adsorption processes are well known and are typically used to separate a more absorbable component gas from a less absorbable component gas
Data Source
AI summary
A cyclic adsorption process is provided, the process containing one or more adsorber vessels undergoing the steps of at least pressurization and depressurization and driven by one or more variable speed centrifugal machines operating under acceleration and deceleration conditions and adjusted to the steps, vessel size, and process conditions employed, wherein the process cycle time is greater than the ratio of the change in inertia, defined the maximum energy that can be lost during a cycle due to inertia changes, to 0.3 times the total power of the one of more centrifugal machines that would be consumed in the absence of inertial effects.