Recycling Flush Streams in Adsorption Separation for Energy Savings
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Solution Overview
Problem
Existing adsorption separation systems face challenges in increasing throughput and recovery of products without replacing expensive equipment, and they struggle with residual component clearance and backmixing, which impairs separation efficiency.
Innovation Solution
The implementation of a simulated moving bed process with a multiport adsorption column that uses sequential port connections for fluid streams, including a zone flush stream and a dome sealant to reduce flush circulation rates and prevent backmixing, utilizing a rotary valve to direct flows and maintain pressure and lubrication, thereby enhancing separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If flush streams are used to prevent backmixing and clear residual components, then separation efficiency is improved, but energy consumption increases due to high flush circulation rates
Solution Approach 1:
The patent recycles flush streams by redirecting them from waste disposal back to the adsorption column inlet. This recovery approach maintains the flushing function for preventing backmixing and clearing residual components while significantly reducing the demand for fresh flush streams, thereby lowering energy consumption associated with generating and circulating large volumes of flush streams.
Solution Approach 2:
The system implements a feedback mechanism where the flush stream output is monitored and fed back to the column inlet. This closed-loop approach ensures that the flush function is maintained efficiently, adjusting the circulation as needed rather than requiring continuously high flush rates, thus reducing energy consumption while maintaining separation efficiency.
2Productivity
If throughput and recovery rates are increased to meet growing demand, then productivity is improved, but equipment replacement becomes necessary due to capacity limitations
Solution Approach 1:
The patent implements multi-functionality by having the flush streams serve dual purposes: maintaining separation efficiency by preventing backmixing and simultaneously being recycled to reduce waste. This allows the existing equipment to handle increased throughput and recovery rates without requiring replacement, as the optimized flush stream utilization maximizes the capacity of the current adsorption system.
Solution Approach 2:
The recycling of flush streams creates a continuous useful action where the flush streams that would otherwise be wasted are continuously redirected back to the column inlet. This continuous circulation maintains high productivity and recovery rates by ensuring constant prevention of backmixing throughout the operation, allowing the existing equipment to sustain increased throughput without capacity limitations.
3Use of energy by moving object
If flush circulation rates are reduced to save energy, then energy consumption is decreased, but residual component clearance and backmixing prevention are compromised
Solution Approach 1:
Instead of discarding flush streams after use, the system recycles them back to the column inlet. This recovery mechanism ensures that even at reduced circulation rates, the flush function is maintained continuously, preventing backmixing and ensuring thorough clearance of residual components while consuming less energy than high-rate single-pass flushing.
Solution Approach 2:
The feedback loop of recycling flush streams ensures that the system maintains reliable residual component clearance and backmixing prevention even at lower circulation rates. The continuous redirection of flush streams provides ongoing verification and maintenance of separation efficiency, ensuring reliability is not compromised by energy-saving reductions in flush rate.
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 increases the capacity of adsorption separation systems, reduces energy consumption, and minimizes the need for equipment replacement by improving residual component clearance and separation efficiency, achieving higher production rates with reduced flush circulation rates and energy savings.
Implementation Method 1
The separation of various substances through selective adsorption is an important process for producing pure substances
Implementation Method 2
the process uses a multiport rotary valve to redirect flow lines in the process
Implementation Method 3
The rotary valve comprises a rotating disc that connects different channels to direct the flow of the different fluids. The dome sealant keeps the valve parts under pressure and to provide lubrication to prevent leakage of the processing fluids
Implementation Method 4
passing a zone flush stream through the transfer line and a fifth port, where the transfer line was used in the prior step for the removal of raffinate
Data Source
AI summary
A process to reduce flush circulation rates in an adsorption separation system is presented. The flush stream is used to improve the capacity of the simulated moving bed system by flushing the contents of the transfer lines containing raffinate material back into the adsorbent column. The flush stream is a material that is used to flush the head chambers in the column, or from the rotary valve flush dome sealant.