Spitwad Catcher for Fluidized Bed Reactor Feed Lines
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Solution Overview
Problem
Fluidized bed reactors face issues with uneven channeling and feed distributor plugging due to the formation of solids, leading to partial or total loss of bed fluidization and necessitating reactor shutdowns, despite existing solutions that do not adequately address these problems.
Innovation Solution
A polymerization process utilizing a spitwad catcher located outside the fluidized bed reactor and in the feed line to collect or remove spitwads, which are solid formations that can plug the feed distributor, using devices such as screens, filters, or cyclones with perforations sized to reduce plugging, thereby maintaining reactor stability and preventing shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feed distributors are used to address uneven channeling, then fluidization uniformity is improved, but the feed distributors tend to plug with solids formed in the reactor
Solution Approach 1:
The invention extracts the harmful solids (spitwads) from the feed line before they reach the feed distributor by installing a spitwad catcher in the recycle loop. This removes the plugging cause while preserving the feed distributor's fluidization function.
Solution Approach 2:
The spitwad catcher acts as an intermediary device between the recycle compressor and the feed distributor, intercepting solids and preventing them from reaching the distributor. This mediator protects the feed distributor without altering its original design or function.
2Reliability
If spitwads are allowed to form and accumulate, then the feed distributor may plug, but removing them requires reactor shutdown
Solution Approach 1:
The spitwad catcher performs preliminary removal of solids from the recycle feed before they can accumulate and cause plugging. By continuously removing spitwads in advance, the system maintains operation without shutdowns.
Solution Approach 2:
The spitwad catcher enables continuous operation by continuously removing solids from the recycle loop. The useful action of polymer production continues uninterrupted while spitwads are simultaneously removed, eliminating periodic shutdowns.
3Reliability
If existing solid removal methods (deflector plates, screens inside reactor) are used, then some plugging is reduced, but they do not adequately prevent feed distributor plugging
Solution Approach 1:
The invention segments the solid removal function from the reactor interior to the external recycle loop. By placing the spitwad catcher outside the reactor, it separates the plugging prevention function from the polymerization zone, reducing internal complexity.
Solution Approach 2:
The solution moves from internal reactor components to an external location in the recycle loop. This dimensional shift from inside-to-outside allows effective plugging prevention without adding internal complexity to the reactor vessel.
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 implementation of a spitwad catcher in the feed line effectively prevents feed distributor plugging, maintaining stable fluidization and reducing downtime by continuously collecting spitwads, thus enhancing the operational efficiency and reliability of fluidized bed reactors.
Implementation Method 1
using devices such as screens, filters, or cyclones with perforations sized to reduce plugging
Data Source
AI summary
There are disclosed polymerization processes and associated apparatuses. The polymerization processes involve both making a polymeric material in a fluidized bed reactor having a feed distributor and catching a spitwad with a spitwad catcher, and the apparatuses are those corresponding to such processes.