Angular Nozzle Catalyst Distributor for Regenerator Temperature Uniformity
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Solution Overview
Problem
In fluid catalytic cracking (FCC) processes, incomplete combustion and nitrous oxide generation occur due to uneven catalyst distribution and oxygen excess, leading to increased nitrous oxide emissions and equipment overheating, which existing methods struggle to mitigate effectively.
Innovation Solution
A catalyst distributor with an angular nozzle system is used to evenly distribute coked catalyst in the regenerator vessel, ensuring uniform exposure to oxygen and reducing the need for carbon monoxide promoters, thereby promoting complete combustion and minimizing nitrous oxide production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional catalyst distribution methods are used, then equipment complexity is reduced, but temperature uniformity and combustion completeness deteriorate
Solution Approach 1:
The catalyst distribution system is segmented into multiple nozzles arranged in a circular pattern, with each nozzle directing catalyst flow to specific zones within the regenerator. This segmentation enables independent control of catalyst distribution to different areas, achieving uniform temperature profiles without requiring complex centralized control systems.
Solution Approach 2:
The angular nozzles are strategically positioned and oriented to deliver catalyst to specific locations where it is most needed for complete combustion. This local quality approach ensures that catalyst is distributed precisely to zones requiring regeneration, improving temperature uniformity and combustion completeness while maintaining simple equipment architecture.
2Reliability
If excess oxygen is used to ensure complete combustion, then regeneration completeness is improved, but nitrous oxide emissions increase
Solution Approach 1:
The angular nozzle system performs preliminary action by distributing catalyst uniformly across the regenerator before combustion begins. This pre-distribution ensures that oxygen is evenly utilized throughout the catalyst bed, enabling complete combustion at lower excess oxygen levels and thereby reducing nitrous oxide formation while maintaining high regeneration completeness.
3Reliability
If carbon monoxide promoters are used to prevent afterburn, then equipment safety is improved, but device complexity and cost increase
Solution Approach 1:
The angular nozzle catalyst distribution system enables the regenerator to self-regulate combustion and prevent afterburn through proper catalyst placement and oxygen distribution. The system eliminates the need for external carbon monoxide promoters by ensuring complete combustion occurs within the regenerator itself, maintaining equipment safety while reducing system complexity and operational costs.
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 achieves more uniform temperatures and predictable combustion, reducing nitrous oxide emissions and eliminating the need for carbon monoxide promoters, leading to improved regeneration efficiency and reduced equipment overheating.
Implementation Method 1
Fluidization of the catalyst particles by various gaseous streams allows the transport of catalyst between the reaction zone and regeneration zone
Implementation Method 2
A high temperature regeneration operation within a regenerator zone combusts coke from the catalyst
Implementation Method 3
Complete regeneration produces a catalyst having less than 0.1 and preferably less than 0.05 wt-% coke
Data Source
AI summary
Disclosed is a catalyst distributor and process for spreading catalyst over a regenerator vessel. Nozzles disposed angular to a header of the distributor spread catalyst throughout a full cross section of the catalyst bed.