Direct Stripping Cyclone for Catalyst Separation
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Solution Overview
Problem
Cyclonic separation of particulate-fluid suspensions often results in the entrapment and adsorption of fluid in the accumulated solids, leading to side-reactions and 'delta coking' in catalytic cracking applications, necessitating a method to separate the suspension while stripping entrained fluid and adsorbed hydrocarbons from the solids.
Innovation Solution
An apparatus with a coaxially arranged vessel having a separation section and a stripping section, where a stripping fluid is introduced through nozzles in the apertures of the transition section to remove entrained gases and residual hydrocarbons from the settled particulates, enhancing the separation efficiency by fluidizing the particulate bed and increasing the upward velocity of the stripping fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cyclonic separation is used to separate particulate-fluid suspensions, then separation efficiency is improved, but fluid entrapment and adsorption in accumulated solids occurs
Solution Approach 1:
The separator is divided into two distinct functional sections: a separation section for cyclonic separation and a stripping section for fluid removal. This segmentation allows each section to optimize its specific function without interfering with the other, resolving the contradiction between separation efficiency and fluid entrapment.
Solution Approach 2:
The stripping section performs preliminary action by removing entrained and adsorbed fluids from solids before they are discharged from the separator. This prevents fluid entrapment issues downstream and eliminates side-reactions that would occur with residual fluids.
2Productivity
If solids accumulate at low point for removal, then separation is achieved, but side-reactions and delta coking occur due to residual hydrocarbons
Solution Approach 1:
The stripping section performs preliminary action by removing entrained and adsorbed fluids from solids before they are discharged from the separator. This prevents fluid entrapment issues downstream and eliminates side-reactions that would occur with residual fluids.
Solution Approach 2:
The upward-flowing stripping fluid creates controlled turbulence and fluidization that converts the harmful effect of fluid entrapment into a beneficial stripping action, effectively removing residual hydrocarbons that would otherwise cause side-reactions.
3Device complexity
If a single vessel is used for both separation and stripping, then device complexity is reduced, but flow control becomes more difficult
Solution Approach 1:
The separator is divided into two distinct functional sections: a separation section for cyclonic separation and a stripping section for fluid removal. This segmentation allows each section to optimize its specific function without interfering with the other, resolving the contradiction between separation efficiency and fluid entrapment.
Solution Approach 2:
A single vessel performs multiple functions: cyclonic separation in the separation section and fluid stripping in the stripping section. This multi-functionality reduces device complexity while maintaining operational control through proper section design and flow distribution.
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 solution effectively increases the catalyst collection efficiency and vapor containment, reducing the amount of gas entrained in solids, and minimizes side-reactions by efficiently stripping residual hydrocarbons from the particulate catalyst, improving the overall separation process.
Implementation Method 1
The centrifugal force generated by the tangential introduction of the suspension to the separator results in the accumulation of a dense solid phase along the walls of the separator, and, through centripetal motion, a less dense fluid phase in the center of the separator
Implementation Method 2
enhancing the separation efficiency by fluidizing the particulate bed and increasing the upward velocity of the stripping fluid
Data Source
AI summary
Systems and methods for the separation of a particulate-fluid suspension are provided. An apparatus for the separation of a particulate-fluid suspension can include an enclosed vessel having two or more sections disposed coaxially along a common longitudinal centerline, wherein a first section has a first cross sectional area and a second section has a second cross sectional area. A plurality of apertures can be disposed about the second section. The apparatus can have a cylindrical surface, parallel to the longitudinal centerline of the apparatus, disposed within the first section. A fluid distribution channel having a plurality of apertures can be disposed either about an exterior surface or an interior of the apparatus. A plurality of fluid conduits can provide fluid communication between the fluid distribution channel and the plurality of apertures distributed about the second section.