Method for compressing an incoming feed air stream in a cryogenic air separation plant
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Solution Overview
Problem
Cryogenic air separation plants face high energy costs due to inefficient compression processes, particularly in conventional integrally geared compressor systems that lack flexibility in handling varying ambient temperatures and air flow rates, leading to suboptimal compressor efficiency and increased power consumption.
Innovation Solution
Implementing a method using direct drive compression assemblies with two variable speed drive assemblies to control the compression of incoming feed air streams, allowing for adjustable speed ratios and improved turndown capabilities, which enables more efficient compression and reduced energy consumption by optimizing air flow and pressure management across different operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional integrally geared compressor systems are used, then structural simplicity is maintained, but compressor efficiency and adaptability to varying operating conditions deteriorate
Solution Approach 1:
The patent applies dynamics by replacing fixed-speed compressors with variable speed compressors that can dynamically adjust their operating speed to match varying ambient temperatures and air flow rates. This allows the compression system to operate at optimal efficiency points across different loading conditions, thereby reducing power consumption while improving adaptability.
Solution Approach 2:
The patent changes the operating parameters of the compression system by introducing variable speed drives that allow continuous adjustment of compressor speed. This parameter change enables the system to adapt to different operating conditions (ambient temperature, air flow rate) and maintain high efficiency across the operating range, directly addressing the contradiction between adaptability and energy consumption.
2Adaptability or versatility
If single speed drive assemblies are used, then device complexity is reduced, but turndown capability and operational flexibility deteriorate
Solution Approach 1:
The patent introduces variable speed drive assemblies that enable dynamic adjustment of compressor speed, significantly improving turndown capability. Although this increases device complexity, the patent manages this through modular implementation and control systems that optimize performance across different operating conditions.
Solution Approach 2:
The patent implements a compression system with multiple compressors that can operate independently or in combination, providing multi-functionality. This universal approach allows the system to handle a wide range of flow rates and operating conditions, improving turndown capability while distributing the complexity across multiple standardized units.
3Use of energy by moving object
If compression systems operate at fixed speed, then operational simplicity is maintained, but compression efficiency under varying conditions deteriorates
Solution Approach 1:
The patent implements control systems that monitor operating conditions (ambient temperature, air flow rate, pressure) and provide feedback to the variable speed drives. This feedback mechanism automatically adjusts compressor speed to maintain optimal compression efficiency, reducing the need for manual intervention and preserving operational simplicity while dramatically improving energy efficiency.
Solution Approach 2:
The compression system is designed to self-regulate by using sensors and control algorithms that automatically adjust operating parameters based on real-time conditions. This self-service capability maintains compression efficiency across varying conditions without requiring complex manual operation, effectively resolving the contradiction between efficiency and operational simplicity.
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 enhances the turndown capability and efficiency of air compression systems, allowing for up to 50% reduction in energy consumption during off-peak conditions while maintaining high average wheel efficiency, thus reducing overall operational costs and expanding the operational envelope of air separation plants.
Implementation Method 1
compressing an incoming feed air stream using at least two direct drive compression assemblies
Data Source
AI summary
A method for compression of an incoming feed air stream using at least two variable speed compressor drive assemblies controlled in tandem is provided. The first variable speed drive assembly drives at least one compression stage in the lower pressure compressor unit driven while the second variable speed drive assembly drives higher pressure compression stage disposed either in the common air compression train or the split functional compression train of the air separation plant. The first and second variable speed drive assemblies are preferably high speed, variable speed electric motor assemblies each having a motor body, a motor housing, and a motor shaft with one or more impellers directly and rigidly coupled to the motor shaft via a sacrificial rigid shaft coupling.