Dual-Section Cyclone Stripping Residual Hydrocarbons
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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 strip entrained and adsorbed hydrocarbons from separated particulate catalysts.
Innovation Solution
A dual-section separator apparatus with a separation section and a stripping section, where a stripping fluid is introduced through nozzles to remove entrained gases and residual hydrocarbons from settled particulates, enhancing the efficiency of solid and fluid phase separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cyclonic separation is used to separate particulate-fluid suspensions, then separation of solid and fluid phases is achieved, but entrapped and adsorbed hydrocarbons remain in the separated particulate catalyst
Solution Approach 1:
The separator is divided into two distinct sections: a separation section for cyclonic separation of solid and fluid phases, and a stripping section for removing entrapped and adsorbed hydrocarbons from the separated particulate catalyst. This segmentation allows each section to perform its specific function independently, resolving the contradiction between achieving separation efficiency and eliminating harmful hydrocarbons.
Solution Approach 2:
A stripping fluid is introduced as an intermediary substance in the stripping section to facilitate the removal of entrapped and adsorbed hydrocarbons from the separated particulate catalyst. The stripping fluid acts as a mediator that transfers hydrocarbons from the catalyst particles to the fluid phase, which is then removed from the system.
2Reliability
If stripping fluid is introduced to remove entrapped hydrocarbons, then catalyst efficiency is improved, but device complexity increases
Solution Approach 1:
The stripping section is merged with the separation section in a coaxial arrangement, where the stripping section is positioned within the separation section. This merging allows both functions (separation and stripping) to be performed in a single integrated apparatus, reducing device complexity compared to using separate apparatus for each function while maintaining improved catalyst efficiency.
Solution Approach 2:
The separator apparatus is designed with multi-functionality, serving both as a cyclonic separator for solid-fluid separation and as a stripping unit for removing hydrocarbons from particulate catalyst. This universal design allows a single device to perform multiple functions, reducing overall system complexity while improving catalyst efficiency through comprehensive processing.
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 apparatus effectively strips residual hydrocarbons from particulate catalysts, improving catalyst efficiency and reducing 'delta coking' by achieving higher catalyst collection and vapor containment efficiencies compared to traditional cyclonic separation methods.
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
a stripping fluid is introduced through nozzles to remove entrained gases and residual hydrocarbons from settled particulates
Data Source
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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.