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Powder Fluidization

Why Powder Fluidization Testing?

Fluidization can be a highly effective method for handling a fine bulk material in an

aerated or liquid-like condition. Air or another gas can be used for powder

fluidization either in a fully fluidized state or only in a localized manner with small

amounts of gas flow.

Fluidization is commonly used with pulverized fuel handling, drying operations,

reaction processes, and fine powder hopper discharge systems.

The advantages for handling powders and bulk solids via fluidization instead of

traditional deaerated gravity flow include:

Elimination or reduction ofarching(bridging) orratholingproblems

Increased discharge rate from a silo or hopper

Blending of solids and reduction in mixture segregation

Increased gas-solids interaction for drying, agglomeration, or reactions

Typical bulk solids suitable for fluidization have a fine particle size, a low

permeability, a tight particle size distribution, and low cohesive

strength. TheGeldart powder fluidization chartis a common reference used to

assess if a bulk solid is a good candidate for fluidization (Geldart zones A and

B). Many solids can be fluidized, though powders prone to segregate or cake are

often not good candidates.

Powder Fluidization Tests

To evaluate powder fluidization suitability, we can perform the following tests:

Minimum fluidization velocity: run with 8 in. (200 mm) dia. test column

Fluidization discharge assessment: run with 22 in. (560 mm) dia. column

Air-assisted discharge: localized powder aeration vs. full fluidization

These tests can be run with various gases (e.g., nitrogen, carbon dioxide) and over

a range of temperatures. During these tests, observations are made to note

settlement behavior, channeling of the solids, formation of a solid plug, and bed

expansion. View avideo of powder fluidization testsperformed in our laboratory.

Test Results

The fluidization test results are presented in a comprehensive report package

containing:

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description of fluidization procedure, test apparatus, fluidization media

graph of powder bed pressure-drop as function of superficial gas velocity

observations of test phenomena such as plug rise, bed spouting, or cracking

video of fluidization behavior in test column

test conclusions and recommendation for fluidization velocity for powderAfter completion of the tests, a Jenike & Johanson engineer will review the results

with you and answer your questions. We will also discuss how the test results may

be used for your fluidization application.

Need to send samples for testing? Clickherefor additional information.

What's Next

Contact usto review your fluidization testing needs with one of our

engineers. After your fluidization tests have been completed, we can show youeffective engineering approaches to handle bulk materials with proven fluidization

technologies to ensure uniform gas distribution, uninterrupted discharge, and

reliable processing.

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