TSA Adsorption Pre-Regeneration Closed Loop
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Solution Overview
Problem
In industrial gas separation processes, TSA adsorption systems require external regeneration gases for efficient regeneration, which can be costly and inefficient when no usable vent gas is available, leading to increased energy consumption and equipment oversizing.
Innovation Solution
A TSA adsorption process utilizing a closed loop system within the adsorber for pre-regeneration, where the adsorber is isolated from the rest of the plant, and a gas circulator and heater are used to circulate and heat the gas within the loop, allowing for efficient heat distribution and impurity desorption without external gas, reducing energy losses and the need for additional gas sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external regeneration gas is used for TSA adsorption regeneration, then regeneration efficiency is improved, but equipment complexity and operational costs increase when no usable vent gas is available
Solution Approach 1:
The system uses its own purified gas stream to provide the regeneration function, eliminating the need for external regeneration gas sources. The purified gas is circulated through the adsorber during regeneration phase, heating the bed and desorbing impurities, thus the system serves its own regeneration needs without additional equipment
Solution Approach 2:
The purified gas stream serves dual functions: it is both the product of the separation process and the regeneration medium. By utilizing the same gas stream for both purification output and regeneration input, the system achieves multi-functionality without requiring separate gas sources or additional equipment
2Reliability
If external regeneration gas sources are provided, then regeneration can be performed, but energy consumption and operational costs increase
Solution Approach 1:
The system recycles its own purified gas stream for regeneration purposes, eliminating energy losses associated with external gas sources. The gas circulates within the system, being heated during regeneration and then cooled to provide cold duty, creating a self-sufficient thermal cycle that minimizes external energy input
Solution Approach 2:
Instead of discarding the purified gas stream or using it solely for its intended purpose, the system recovers and reuses it for regeneration. The gas that would otherwise be wasted or underutilized is captured and employed to heat the adsorber bed, thereby recovering valuable thermal energy within the system
3Reliability
If regeneration gas is circulated through the adsorber, then impurity desorption is achieved, but thermal inertia extends the cycle time
Solution Approach 1:
The purified gas stream continuously circulates through the adsorber during regeneration, maintaining continuous heat transfer to the adsorbent bed. This continuous circulation ensures steady-state heating and consistent desorption rates, preventing interruptions that would extend cycle time
Solution Approach 2:
The system monitors the thermal state of the adsorber bed and adjusts the circulation of purified gas accordingly. By providing feedback on temperature and desorption progress, the system optimizes the regeneration duration, ensuring impurity removal is achieved as quickly as possible without unnecessary delays
4Productivity
If multiple adsorption cylinders are operated in parallel, then continuous operation is ensured, but system complexity and capital costs increase
Solution Approach 1:
Each adsorber unit is equipped with self-regeneration capability using its own purified gas stream. This self-sufficiency allows single-unit operation to maintain continuous productivity through rapid cyclic regeneration, eliminating the need for multiple parallel units and reducing system complexity
Solution Approach 2:
The system performs preliminary heating of the purified gas stream before it enters the adsorber during regeneration phase. By pre-heating the regeneration gas, the thermal inertia effect is reduced, allowing faster regeneration cycles and maintaining continuous operation without requiring multiple large-scale parallel units
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 minimizes energy losses and reduces the need for external gas sources, achieving efficient regeneration with reduced operational costs and stable production flows, while maintaining high adsorption capacity and purity levels.
Implementation Method 1
a heater 3 for heating the gas circulating in the closed loop
Implementation Method 2
a gas circulator 2 for circulating the gas within the adsorber in pre-regeneration in a closed loop
Implementation Method 3
purifying the gas stream by adsorption of the impurities
Implementation Method 4
a depressurization means 5 for depressurizing the adsorber at the start of the regeneration phase
Data Source
AI summary
A gas stream is purified by a TSA adsorption scheme including at least two adsorbers following, in an offset manner, a cycle including an adsorption phase, and a subsequently, a regeneration phase. The regeneration phase includes a depressurization step, a pre-regeneration step and a regeneration step. A gas circulator is used to circulate the gas within the adsorber in the pre-regeneration step in a closed loop while the circulating gas is heated with a heater.