Multi-Sloped Baffles for FCC Stripper Catalyst Distribution
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Solution Overview
Problem
Catalyst bypassing occurs in FCC stripper vessels, leading to reduced stripping efficiency due to insufficient momentum and greater distance between baffles, resulting in uneven catalyst distribution and lower bed density, which affects differential pressure and hydrocarbon removal.
Innovation Solution
Incorporating a second face on baffles that extends into the downcomer channel between paired baffles to direct falling catalysts towards adjacent baffles, ensuring transverse movement and preventing bypassing, thereby increasing contact with stripping fluid and achieving uniform bed density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the distance between baffles is increased or catalyst momentum is reduced, then the stripping apparatus size is reduced or operation is simplified, but catalyst bypassing occurs and stripping efficiency decreases
Solution Approach 1:
The baffle design incorporates a second face that extends into the downcomer channel, creating a multi-dimensional catalyst redirection system. This second face projects into the flow path at an angle to the first face, forcing catalyst to change direction twice and ensuring it engages with the baffle structure rather than bypassing it, thus maintaining stripping efficiency without increasing baffle density
Solution Approach 2:
The angled second face of the baffle performs preliminary redirection of the catalyst flow before it can bypass the baffle structure. By anticipating the catalyst's downward momentum and intercepting it with the protruding second face, the design ensures catalyst engagement with baffles even when spacing is increased or momentum is reduced
2Volume of stationary object
If baffle spacing is increased, then apparatus volume is reduced, but catalyst distribution becomes uneven and bed density decreases
Solution Approach 1:
The second face of the baffle extends into the downcomer channel at an angle, creating a three-dimensional catalyst redirection mechanism. This additional geometric dimension ensures catalyst is forced to engage with the baffle structure and redistributes evenly across the apparatus volume, maintaining uniform bed density even with increased baffle spacing
Solution Approach 2:
The baffle design creates localized catalyst engagement zones through the angled second face that projects into the downcomer. This local redirection ensures catalyst is properly distributed in critical areas between baffles, maintaining uniform composition throughout the apparatus volume
3Force
If catalyst momentum is reduced, then operating conditions are gentler, but catalyst cannot traverse sufficient distance between baffles leading to bypassing
Solution Approach 1:
The second face of the baffle performs preliminary interception of catalyst flow at an angle, catching catalyst particles before they can bypass the baffle structure. This preliminary action ensures reliable catalyst-baffle engagement even when catalyst momentum is reduced, maintaining stripping reliability under gentler operating conditions
Solution Approach 2:
The angled second face creates an additional interaction dimension that compensates for reduced catalyst momentum. By forcing catalyst to change direction twice through the multi-faced baffle structure, reliable engagement is achieved even with lower force, ensuring consistent stripping performance
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 design enhances stripping efficiency by ensuring all catalysts engage with baffles, resulting in improved hydrocarbon removal and maintaining adequate differential pressure for catalyst transport, leading to increased production and reduced delta coke.
Implementation Method 1
contacting a hydrocarbon containing feed with the catalyst under conditions wherein a fluid maintains the particles in a fluidized condition
Implementation Method 2
passing a stripping gas, usually steam, through a flowing stream of catalyst, counter-current to its direction of flow
Data Source
AI summary
An apparatus for stripping gases from catalyst material comprises baffles having a second face that extends toward a downcomer channel between baffles to spread catalyst out on adjacent baffles for better contact with stripping gas.