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How do you separate the powder from air in the fluid bed?

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The powder from air in the fluid bed...

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So in the fluid bed

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we have a system where we could start with

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powder like particles.

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We start the engine

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and the driving force in a fluid bed is air. 

8
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So we need some fluidization

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of our particles in the fluid bed in

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order to run a process

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If we would have to less air

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than the product would not move

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and we do not have a good process.

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But the air is not as high

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that the particles would leave the fluid bed unit

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as they would do it in a in a spray dryer

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So he is just in to move the particles

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and to provide energy for the process