Reactor Multi-Pass Grids for Catalyst Distribution
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Solution Overview
Problem
In MTO reactors, catalyst distribution and contact with reactants are inefficient due to the formation of dense catalyst regions and segregation, leading to reduced catalyst life and economic inefficiencies in light olefin production.
Innovation Solution
The use of a reactor design with multiple grids having small and large openings to facilitate counter-current flow of catalyst and gas, minimizing segregation and ensuring uniform catalyst distribution by directing catalyst flow across the reactor and preventing localized high velocity areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If catalyst flows down the reactor in a conventional manner, then the reactor structure is simple, but dense catalyst regions and segregation occur leading to poor catalyst distribution
Solution Approach 1:
The reactor interior is segmented into multiple zones using vertically extended plates arranged in a grid pattern. These plates divide the continuous catalyst flow into multiple parallel paths, forcing the catalyst to move across different regions and preventing the formation of dense catalyst regions and segregation, thereby achieving uniform catalyst distribution throughout the reactor.
Solution Approach 2:
The vertically extended plates act as intermediary elements that intervene between the incoming catalyst flow and the reactor product stream. These plates redirect the catalyst flow pattern, ensuring uniform distribution of catalyst across the reactor cross-section and preventing localized accumulation or segregation of catalyst particles.
2Stability of the object's composition
If catalyst flow is restricted to maintain uniform distribution, then catalyst segregation is minimized, but catalyst flow efficiency decreases
Solution Approach 1:
The grid of vertically extended plates creates locally varied flow conditions across different zones of the reactor. Each zone between adjacent plates experiences controlled catalyst accumulation and flow patterns, allowing uniform overall distribution while maintaining efficient local catalyst flow and contact with the product stream.
3Stability of the object's composition
If catalyst particles are constantly stirred to prevent segregation, then catalyst distribution improves, but catalyst attrition increases reducing catalyst life
Solution Approach 1:
The system dynamically adjusts catalyst flow patterns through the grid structure without requiring mechanical stirring. The vertically extended plates create natural flow dynamics that prevent segregation while minimizing particle-to-particle contact and friction, thereby reducing attrition and extending catalyst life compared to mechanically stirred 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
This design enhances catalyst flow and contact with reactants, improving product yields and extending catalyst life by preventing segregation and maintaining uniform catalyst distribution, thus making the production process more economical.
Implementation Method 1
The large openings facilitate the flow of catalyst while minimizing the catalyst holdup, and direct the catalyst to flow at least partially across the grids as the catalyst flows down the reactor
Implementation Method 2
The MTO reactor is generally a fluidized bed and the catalyst particles are subject to constant contact and rubbing against other catalyst particles and with physical equipment where the catalyst particles are transferred through, or stirred within
Implementation Method 3
The process comprises flowing a oxygenate rich stream over the catalyst in a generally counter-current flow, with the catalyst flowing down the reactor vessel and the gas flowing up the vessel
Data Source
AI summary
A process and device for the flow of catalyst in a reactor is presented. The device includes a series of grids within a reactor vessel, where each grid includes small openings for the passage of gas and some catalyst particles, and larger openings for the more continuous passage of catalyst. The grids span horizontally across the vessel, and are spaced vertically apart to provide for the flow of catalyst down through the reactor.