PSA Unit Reconfiguration for Multi-Adsorber Fault Operation
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Solution Overview
Problem
Pressure swing adsorption (PSA) units with multiple adsorbers face inefficiencies when two or more adsorbers fail, leading to reduced output and potential unit shutdown due to the inability to reconfigure effectively with operational adsorbers.
Innovation Solution
A method for managing PSA units by grouping adsorbers into sets, allowing instrumentation exchange between operational and faulty adsorbers, enabling continued operation with a degraded cycle configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PSA units operate with multiple adsorbers in a nominal cycle, then gas production efficiency is optimized, but the system becomes vulnerable to shutdown when two or more adsorbers fail
Solution Approach 1:
The control device dynamically reconfigures the adsorber groups based on operational status. When a fault is detected, the system transitions from a static nominal cycle to a degraded cycle, redistributing operational adsorbers into new groups to maintain continuous operation. This dynamic adaptation allows the system to preserve productivity while responding to changing operational conditions.
Solution Approach 2:
The system changes operational parameters by modifying the grouping configuration of adsorbers. Instead of maintaining fixed group assignments, the control device recalculates and reassigns adsorbers to different groups based on their operational status, enabling the system to continue functioning in a degraded mode rather than shutting down completely.
2Reliability
If the system shuts down when adsorbers fail, then safety and operational integrity are maintained, but downtime and production loss increase
Solution Approach 1:
The control device is pre-programmed with degraded cycle configurations and fault detection logic. When a fault occurs, the system can immediately execute pre-planned reconfiguration sequences, swapping adsorbers between groups and transitioning to degraded operation without requiring manual intervention or extended shutdown periods for decision-making.
Solution Approach 2:
The control device acts as an intermediary that manages the transition between nominal and degraded operations. It coordinates the swapping of adsorbers between groups, manages the reconfiguration of cycles, and maintains operational integrity throughout the transition, enabling continuous operation while preserving safety and integrity standards.
3Device complexity
If adsorbers are fixed in static groups, then control and monitoring are simplified, but flexibility to handle multiple failures is reduced
Solution Approach 1:
The control device is designed with multi-functionality, capable of managing both nominal cycles with fixed groups and degraded cycles with dynamic reconfiguration. It can detect faults, calculate new group assignments, execute swaps, and maintain control across different operational modes, providing both simplicity in normal operation and flexibility under fault conditions through a single unified 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
Enables optimized gas production by maintaining unit operation even with multiple adsorber failures, enhancing flexibility and reducing downtime.
Implementation Method 1
a gas-phase adsorption process allows the separation of one or more molecules from a gaseous mixture containing them, by exploiting the difference in affinity of one or more adsorbents for the different constituent molecules of the mixture
Implementation Method 2
the adsorbent at the end of the production phase is regenerated by desorption of impurities achieved through a decrease in their partial pressure
Implementation Method 3
PSA processes proper in which the high pressure is substantially greater than atmospheric pressure, typically between 3 and 50 bar abs and the low pressure substantially equal to or greater than atmospheric pressure, generally between 1 and 9 bar abs
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Method for managing a pressure swing absorption gas treatment unit (100), comprising: - at least N adsorbers (1-12) arranged in G groups (21-26) each comprising n=N/G adsorbers, each adsorber (1-12) comprising an instrumentation means; - a control device allowing the unit (100) to operate selectively according to a nominal cycle with N adsorbers and according to a downgraded cycle; - a plurality of connections for the control device to access the instrumentation means, characterized in that when a first and a second group each comprise at least one operational adsorber (1-12) and at least one faulty adsorber (6,8), the method comprises the steps of: - stopping the unit (100); - fluidically isolating the faulty adsorbers (1-12); - switching the instrumentation means of the faulty adsorber with those of the operational adsorber; - controlling the unit (100) according to the downgraded cycle.