Gas Permeable Tower Shell Annular Duct for Droplet Polymerization
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Solution Overview
Problem
Existing reactors for droplet polymerization face issues with gas velocity constrictions, particle entrainment, and unwanted deposits due to the design of the annular duct, leading to reduced yield and increased load on off-gas dedusting systems.
Innovation Solution
The apparatus features a tower shell with a gas permeable material forming the inner wall of the annular duct, allowing direct gas flow and reducing gas velocity, which minimizes particle entrainment and eddy formation, and potentially eliminates the need for support struts, thereby improving the efficiency and handling of the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the tower shell projects into the region with decreasing hydraulic diameter to form an annular duct, then gas can be withdrawn from the reactor, but gas velocities become too high causing particle entrainment and deposits
Solution Approach 1:
The gas withdrawal system is segmented into multiple gas withdrawal points distributed around the annular duct, allowing gas to be extracted at different locations and reducing the velocity through each individual withdrawal point, thereby minimizing particle entrainment
Solution Approach 2:
The annular duct is designed with specific geometric characteristics (cross-sectional area, hydraulic diameter) optimized for gas withdrawal, creating a localized region with favorable flow conditions that reduce gas velocity and prevent particle entrainment while maintaining effective gas removal
2Device complexity
If the tower shell projects into the region with decreasing hydraulic diameter, then an annular duct is formed for gas withdrawal, but additional support struts are required which create constrictions and increase particle entrainment
Solution Approach 1:
The annular duct is designed as a self-supporting thin-walled structure that projects into the region with decreasing hydraulic diameter, eliminating the need for additional support struts and avoiding the constrictions they would create, thereby reducing particle entrainment
Solution Approach 2:
The annular duct has a curved, streamlined geometry that follows the contour of the tower shell, creating smooth flow paths without sharp edges or constrictions that would cause turbulence and particle entrainment
3Speed
If the gas stream is deflected 180° by the tower shell, then gas flow is redirected, but turbulence and eddies are formed trapping particles
Solution Approach 1:
The gas stream deflection is achieved through a curved, gradual transition in the annular duct geometry rather than a sharp 180° angle, creating smooth flow paths that minimize turbulence and eddy formation, thereby reducing particle trapping
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 reduces particle entrainment and eddy formation, enhancing the yield and reducing the load on off-gas dedusting systems, while also simplifying the reactor's structure and handling by minimizing material usage and potential deposits.
Implementation Method 1
the part of the tower shell projecting into the region having at least partly a decreasing hydraulic diameter and forming an inner wall of the annular duct is made at least partly of a gas permeable material
Data Source
AI summary
The invention relates to an apparatus for producing a pulverulent product, comprising a device for dropletization (5) of a liquid phase, an addition point (15) for a gas above the device for dropletization (5), at least one gas withdrawal point (19) on the circumference of the apparatus (1), a solid withdrawal point (12) and a tower shell (13) between the device for dropletization (5) and the gas withdrawal point (19) and having, above the solid withdrawal point (12), a region (11) having at least partly a decreasing hydraulic diameter toward the solid withdrawal point (12) and having a maximum hydraulic diameter greater than the mean hydraulic diameter of the tower shell (13), and the tower shell (13) projecting into the region (11) having at least partly a decreasing hydraulic diameter such that an annular duct (23) is formed between the part of the tower shell (13) projecting into the region (11) having at least partly a decreasing hydraulic diameter and the upper part (27) of the region having at least partly a decreasing hydraulic diameter, the at least one gas withdrawal point (19) being disposed in the annular duct (23), wherein the part of the tower shell (13) projecting into the region (11) having at least partly a decreasing hydraulic diameter and forming an inner wall of the annular duct (23) is made at least partly of a gas permeable material (29). The invention further relates to a use of the apparatus (1) for producing pulverulent poly(meth)acrylate.