Segmented Baffle Ring for Riser Reactor Mixing
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Solution Overview
Problem
Existing riser reactors in fluid catalytic cracking processes face challenges with non-uniform mixing of feedstock and catalyst due to temperature differentials and frictional drag, leading to lower reaction efficiency and yield, and the installation and maintenance of baffles in these tall, narrow reactors are difficult and time-consuming.
Innovation Solution
A segmented baffle ring system is introduced, where baffle assemblies are releasably coupled to the sidewall of the riser, creating turbulence and uniform mixing by extending inwardly into the reactor, and can be easily installed and removed without on-site construction or maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If baffles are installed in the riser to improve mixing, then reaction efficiency and product yield increase, but installation and maintenance become difficult and time-consuming
Solution Approach 1:
The baffle is divided into multiple segments that can be independently installed and removed. Each segment can be accessed and manipulated separately through the riser, allowing for easier installation, maintenance, and replacement without requiring complete disassembly or prolonged shutdowns.
Solution Approach 2:
The baffle segments are designed to be movable or adjustable rather than fixed permanently. This allows operators to insert, remove, and reposition individual segments as needed, providing flexibility for maintenance operations while maintaining the mixing function during operation.
2Stability of the object's composition
If traditional baffles are used in tall, narrow risers, then mixing is improved, but access for maintenance becomes problematic
Solution Approach 1:
By segmenting the baffle structure, each individual segment can be accessed, removed, and repaired separately. This segmentation allows maintenance personnel to work on specific portions of the baffle without needing to access the entire structure, significantly improving ease of repair in tall, narrow risers.
Solution Approach 2:
Individual baffle segments can be extracted or removed from the riser for maintenance or replacement. This extraction capability allows problematic segments to be taken out and serviced without affecting the overall baffle structure or requiring complex access procedures.
3Productivity
If baffles are installed to create turbulence, then catalyst contact with feedstock improves, but erosion control becomes more difficult
Solution Approach 1:
The baffle segments can be made from erosion-resistant materials or have protective coatings applied to their surfaces. This local quality enhancement protects the portions of the baffle most susceptible to erosion while maintaining the turbulence-generating function, thereby protecting the riser wall from excessive erosion.
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
The segmented baffle ring enhances uniform mixing of feedstock and catalyst, increasing reaction efficiency and product yield while simplifying baffle installation and maintenance, reducing downtime and operational complexities.
Implementation Method 1
obstacles such as baffles or other contact devices have been proposed to create turbulence and redirection of flow to cause more uniform mixing in the riser
Data Source
AI summary
Embodiments of apparatuses and risers for reacting a feedstock in the presence of a catalyst and methods for installing a baffle in such risers are provided. In one example, a riser comprises a sidewall that defines a cylindrical housing surrounding an interior. A plurality of baffle assemblies is releasably coupled to the sidewall and each comprises a baffle section. The baffle sections together define a segmented baffle ring extending inwardly in the interior.