Lateral Catalyst Conduit Fluidization for Stable Pressure Drop
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Solution Overview
Problem
Improper fluidization in lateral sections of fluid catalytic crackers (FCC) conduits leads to issues such as loss of differential pressure, affecting the operation of devices like spent catalyst slide valves (SCSV), which impairs the efficient conversion of hydrocarbons.
Innovation Solution
A fluidizer system with nozzles positioned inside the conduit's flow space is used to direct jets of a fluidizing agent, ensuring proper fluidization of spent catalyst flowing through lateral sections, maintaining consistent pressure differentials and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If catalyst flows through lateral section without fluidization, then system complexity is reduced, but differential pressure is lost and equipment operation is impaired
Solution Approach 1:
A fluidizing agent is introduced as an intermediary substance between the catalyst particles in the lateral section. This fluidizing agent mediates the interaction between catalyst particles, preventing them from settling and maintaining fluidization state, thereby preserving differential pressure without requiring complex active control systems
Solution Approach 2:
The catalyst flow system is designed to maintain its own fluidization state through the continuous introduction of fluidizing agent. The system self-regulates by using the fluidizing agent to keep catalyst particles suspended and moving, eliminating the need for external control mechanisms while maintaining reliable differential pressure
2Device complexity
If catalyst settling occurs in lateral section, then fluidization is simplified, but equipment operation and catalyst circulation are impaired
Solution Approach 1:
The fluidizing agent acts as a mediator that prevents catalyst particles from settling in the lateral section. By introducing this intermediary substance, the system maintains catalyst fluidization and continuous circulation without requiring complex mechanical agitation or pumping systems
Solution Approach 2:
The system uses pneumatic principles by introducing a fluidizing gas or liquid through nozzles into the lateral section. This pneumatic action keeps catalyst particles suspended and moving, ensuring continuous circulation and high productivity without complex mechanical systems
3Device complexity
If no fluidizer is used in lateral section, then device complexity is reduced, but catalyst occlusion occurs and conversion efficiency decreases
Solution Approach 1:
The fluidizing agent serves as an intermediary that prevents catalyst occlusion in the lateral section. By maintaining catalyst fluidization through this intermediary substance, the system ensures continuous catalyst movement and maintains high hydrocarbon conversion efficiency without requiring complex mechanical prevention systems
Solution Approach 2:
The fluidizing agent is continuously introduced into the lateral section to maintain uninterrupted catalyst fluidization. This continuous action prevents catalyst occlusion and ensures uninterrupted hydrocarbon conversion, maintaining high productivity without complex intermittent control systems
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 system ensures continuous catalyst circulation and efficient operation of equipment by preventing catalyst settling and occlusion, thereby enhancing the conversion efficiency of hydrocarbons.
Implementation Method 1
The at least one nozzle forms and directs a jet of a fluidizing agent into the spent catalyst in the lateral section
Data Source
AI summary
A system for processing a selected feedstock using a catalyst includes a reactor, a catalyst recovery system, and a conduit. The reactor receives the catalyst and the selected feedstock. A reaction between the selected feedstock and the catalyst generates a spent catalyst. The catalyst recovery system processes the spent catalyst. The conduit connects the reactor to the catalyst recovery system and has a lateral section. The spent catalyst flows from the reactor through a flow space defined by an inner wall of the lateral section to the catalyst recovery system. The system also includes a fluidizer positioned at the lateral section. The fluidizer includes at least one nozzle. The at least one nozzle is completely inside the flow space. The at least one nozzle forms and directs a jet of a fluidizing agent into the spent catalyst in the lateral section.