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in Fluidization Engineering by (102k points)
At what rate the coarse sand is circulated along with the feedstock?

(a) 5 times

(b) 10 times

(c) 15 times

(d) 20 times

This question was posed to me by my school teacher while I was bunking the class.

Question is from Thermal Cracking topic in section Industrial Applications of Fluidized Beds of Fluidization Engineering

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Best answer
The correct answer is (d) 20 times

To explain: In order to maintain the temperature and not let the sand particles break down, high flow rate is maintained.

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