Multi-Zone Catalyst Regenerator Coke Removal
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Solution Overview
Problem
Existing catalyst regeneration processes are limited by coke buildup, which reduces catalyst effectiveness and requires improved control over combustion conditions to extend catalyst life and increase regeneration efficiency.
Innovation Solution
A multi-stage regeneration process with independent gas loops and varying oxygen concentrations and temperatures in upper and lower burn zones, allowing for more precise control over coke removal and catalyst rejuvenation, including additional stages for further processing and halogenation to redistribute catalytic metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-stage combustion process is used for catalyst regeneration, then the process is simpler to operate, but coke removal efficiency is insufficient and catalyst life is reduced
Solution Approach 1:
The regenerator is divided into multiple combustion zones (first combustion zone with lower oxygen concentration and second combustion zone with higher oxygen concentration), allowing different stages of coke combustion to occur under optimized conditions. This segmentation improves coke removal efficiency while managing the complexity through functional zoning rather than complete process redesign.
Solution Approach 2:
Different regions of the regenerator are assigned different oxygen concentrations and temperature profiles tailored to specific combustion stages. The first combustion zone uses milder conditions (lower oxygen) to remove easily combustible coke, while the second combustion zone uses stronger conditions (higher oxygen) for refractory coke, optimizing local combustion conditions for each zone's specific function.
2Productivity
If high oxygen concentration is used throughout the combustion process, then coke removal is faster, but catalyst damage increases and catalyst life decreases
Solution Approach 1:
The first combustion zone performs preliminary coke removal under controlled, lower oxygen conditions before the catalyst enters the second combustion zone. This preliminary action removes the most reactive and easily combustible coke components, preparing the catalyst for the more intense combustion in the second zone while minimizing overall catalyst exposure to harsh conditions.
Solution Approach 2:
The oxygen concentration parameter is varied spatially through the regenerator, with the first combustion zone operating at lower oxygen concentrations (e.g., 0.5-2%) and the second combustion zone operating at higher oxygen concentrations (e.g., 2-5%). This parameter change allows optimization of combustion rate at each stage while protecting catalyst integrity.
3Reliability
If multiple combustion zones with varying oxygen concentrations are implemented, then coke removal efficiency improves and catalyst life extends, but equipment complexity and operational difficulty increase
Solution Approach 1:
Multiple combustion zones are combined within a single regenerator vessel, integrating the functions of different oxygen concentration environments into one unified piece of equipment. This merging approach achieves the benefits of staged combustion while avoiding the operational complexity of multiple separate regenerators, as all zones operate simultaneously within the same equipment footprint.
4Productivity
If conventional single-zone regeneration is used, then equipment size is smaller, but processing capacity and regeneration robustness are limited
Solution Approach 1:
The regenerator design incorporates vertical zoning with the first combustion zone positioned above the second combustion zone, utilizing the vertical dimension to create distinct combustion environments. This dimensional arrangement allows multiple combustion stages to occur simultaneously in different vertical levels, increasing processing capacity without requiring proportional increases in horizontal equipment footprint.
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 approach enhances coke removal efficiency, extends catalyst life, and allows for more robust regeneration cycles, reducing equipment size or increasing processing capacity within existing equipment.
Implementation Method 1
The catalyst is treated at a first set of combustion conditions with a first regeneration gas, within the first stage, and thereby generating an intermediate catalyst stream
Implementation Method 2
The intermediate catalyst stream is passed to a second stage in the regenerator, where the catalyst is treated at a second set of combustion conditions with a first portion of a second regeneration gas
Implementation Method 3
halogenation to redistribute catalytic metals
Data Source
AI summary
A process for a continuous regeneration of a catalyst wherein the regeneration section includes at least two separate zones. The regeneration includes an upper combustion zone, and an lower combustion zone, where the process utilizes at least two independent regeneration gas loops for control of the amount of oxygen to regenerate the catalyst. The upper combustion zone can be divided into multiple zones, and the combustion zone can be divided into multiple zones.