Cyclic Metals Deactivation Unit for FCC Catalyst
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Solution Overview
Problem
Single-vessel fluid catalytic cracking (FCC) units experience thermal stress and prolonged non-productive times due to repetitive temperature changes, leading to reduced vessel life and inefficient sample processing in catalyst deactivation experiments.
Innovation Solution
A cyclic metals deactivation system utilizing separate cracker and regenerator vessels, along with an age distribution vessel, to crack, regenerate, and distribute catalysts, reducing thermal stress and improving fluidization homogeneity through the use of porous plates and dip tubes for efficient catalyst transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single vessel is used for both cracking and regeneration, then device complexity is reduced, but thermal stress on the vessel increases and vessel life decreases
Solution Approach 1:
The system divides the single vessel into two separate vessels: a cracker vessel for cracking operations and a regenerator vessel for regeneration operations. This segmentation allows each vessel to operate at its optimal temperature without subjecting either vessel to the thermal stress of repeated heating and cooling cycles, thereby extending vessel life while maintaining operational flexibility
2Device complexity
If a single vessel is used for both cracking and regeneration, then device complexity is reduced, but non-productive time increases due to heating and cooling cycles
Solution Approach 1:
By separating the cracking and regeneration functions into distinct vessels, the system eliminates the need to heat and cool a single vessel between operations. The cracker vessel can continuously process feedstock while the regenerator vessel handles catalyst regeneration, significantly reducing non-productive time and improving overall productivity
Solution Approach 2:
The dual-vessel configuration enables continuous operation where the cracker vessel maintains steady-state cracking conditions while the regenerator vessel performs regeneration. This continuity eliminates idle periods associated with heating/cooling cycles and maintains productive action throughout the operational cycle
3Productivity
If repetitive temperature changes are applied in a single vessel, then catalyst deactivation can be achieved, but thermal stress accumulates and reduces vessel life
Solution Approach 1:
The system segments the temperature cycling process by dedicating the cracker vessel to cracking operations at high temperature and the regenerator vessel to regeneration at lower temperature. This separation allows the cracker vessel to maintain stable high-temperature conditions for efficient cracking without subjecting it to repeated thermal shocks, thereby extending vessel life while maintaining deactivation effectiveness
Solution Approach 2:
The regenerator vessel acts as an intermediary that handles the thermal processing of the catalyst separately from the cracking process. By using the regenerator as a dedicated thermal processing unit, the cracker vessel is protected from thermal stress while still achieving effective catalyst deactivation through the coordinated operation of both vessels
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 significantly reduces thermal stress on vessels, decreases non-productive time, and enhances sample efficiency by maintaining constant temperatures and improving fluidization, resulting in a longer vessel life and faster overall operating time.
Implementation Method 1
a cracker vessel configured for cracking and stripping a catalyst material
Implementation Method 2
fluid catalytic cracking (FCC) units
Implementation Method 3
a regenerator vessel configured for regeneration and steam deactivation of the catalyst material
Implementation Method 4
regeneration by burning off any deposited coke
Implementation Method 5
improving fluidization homogeneity through the use of porous plates
Implementation Method 6
transporting, by one or more dip tubes, the catalyst between the cracker vessel, regenerator vessel, and age distribution vessel
Data Source
AI summary
A cyclic metals deactivation system unit for the production of equilibrium catalyst materials including a cracker vessel configured for cracking and stripping a catalyst material; and a regenerator vessel in fluid communication with the cracker vessel, the regenerator vessel configured for regeneration and steam deactivation of the catalyst material.