Fluidization Engineering

Importance of the Distributor

Question 1
Marks : +2 | -2
Pass Ratio : 100%
What is the fluidizing velocity range for drying of fine coal with fluidized bed?
3.7-4.3 m/s
4.3-4.9 m/s
4.9-5.5 m/s
5.5-6-1 m/s
Explanation:
Based on the pilot plant study, the velocity was decided.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which type of distributor provides the best quality for fluidization?
Single orifice plate
Multiple orifice plate
Nozzle plate
Sintered plate
Explanation:
More the number of holes better is the distribution of air or fluid in the bed.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which type of distributor reduces channelling and slugging to maximum extent?
Single orifice plate
Multiple orifice plate
Nozzle plate
Sintered plate
Explanation:
More the number of holes better is the distribution of air or fluid in the bed, hence less channelling and slugging.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
What is range of orifice diameter in the distributor in FCC?
3.8-5.1 cm
1.2-3.5 cm
5.5-7.9 cm
None of the mentioned
Explanation:
In order to lop pressure drop and best efficiency, this range is selected.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
What is the approximate pressure drop across the orifice distributor?
10%
15%
20%
5%
Explanation:
From the experimental studies, it was found that pressure drop was 10% across the distributor.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
What is the range of nozzle opening in the roasting of sulphide ore?
0.4-0.6 cm
1.2-1.5 cm
3.8-5.1 cm
None of the mentioned
Explanation:
Nozzles generally have very small diameter holes in order to provide high velocity gas.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which arrangement is fabricated in order to prevent the solids pass through the distributor?
Orifice
Nozzle
Sintered
All of the mentioned
Explanation:
Nozzle is a cap like structure which prevents the passage of solids through the distributor.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which kind of fluid is included to obtain smooth fluidization?
Water
Air
Oxygen
Nitrogen
Explanation:
Since water doesnt bubble, it simply fills up the bed with causing any disturbance in the bed.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Air is introduced in the bed to fluidize the bed in the bubble form, true or false?
True
False
Explanation:
Air forms bubbles while passing through the bed.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In case of a heavy bed, which type of distributor can withstand its weight?
Flat
Convex
Concave
Concavo-convex
Explanation:
Weight is distributed among the plate without getting concentrated on any portion of distributor.