Multi-Stage Stirred Reactor Backmixing Reduction
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Solution Overview
Problem
Current multi-stage stirred reactors face challenges in combining good mixing with a narrow residence time distribution, especially when dealing with processes requiring long residence times and the presence of solids, as they often result in high backmixing and increased pressure loss, making them unsuitable for compact and efficient continuous operation.
Innovation Solution
A multi-stage stirred reactor design featuring a plurality of adjacent reaction chambers with dynamically adjustable openings controlled by an actuating rod, allowing for periodic switching between open and closed states to reduce backmixing and enable the transport and discharge of solids, while also incorporating baffles and modular construction for flexibility and enhanced heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If openings between adjacent reaction chambers are made large to facilitate solid discharge, then solid transport is improved, but backmixing increases and residence time distribution broadens
Solution Approach 1:
The closure means are designed to be dynamically adjustable, allowing the opening state to change from open to closed. This dynamic control enables the system to optimize between solid discharge (open state) and minimizing backmixing (closed state), resolving the contradiction between ease of solid discharge and maintaining narrow residence time distribution
Solution Approach 2:
The system changes the parameter of opening size from fully open to fully closed state. By adjusting this parameter, the system can control the degree of fluidic connection between chambers, thereby managing both solid discharge capability and backmixing levels to achieve narrow residence time distribution
2Ease of operation
If stirrer speeds are increased to improve mixing, then mixing performance is improved, but backmixing increases and residence time distribution broadens
Solution Approach 1:
The closure means provide dynamic control over inter-chamber connectivity. By closing the openings, the system can prevent backmixing even when stirrer speeds are high, allowing aggressive mixing without compromising residence time distribution narrowness
3Device complexity
If the number of sealing points is reduced for compact design, then device complexity is reduced, but reliability may worsen due to fewer isolation points
Solution Approach 1:
The actuating rod combines multiple functions: it simultaneously actuates multiple closure means across different chambers and serves as the drive shaft for stirring elements. This merging reduces the number of separate sealing points while maintaining reliable isolation through the integrated closure system
Data Source
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AI summary
The invention relates to a multi-stage stirred reactor, comprising a plurality of reaction chambers adjacent to each other and stirring elements for mixing the content of at least one of the reaction chambers, wherein at least one opening that can be closed by means of closing elements is provided between each pair of adjacent reaction chambers, such that a fluid connection between the adjacent reaction chambers is obtained in the open state and the adjacent reaction chambers are isolated from each other in the closed state. At least one of the closing elements (300, 310, 320) is connected to an actuating rod (500, 510, 520) led out of the stirred reactor. The actuating rod (500, 510, 520) can be actuated back and forth between at least a first position and a second position by rotation and/or displacement, wherein in the first position, closing elements (300, 310, 320) connected to the actuating rod (500, 510, 520) effect an opened state of the opening associated with said closing elements and, in the second position, closing elements (300, 310, 320) connected to the actuating rod (500, 510, 520) effect a closed state of the opening associated with said closing elements.