Question 21, Morning Session of Professional Knowledge, 2014
Thread Content
21. A suspension is filtered using a plate and frame filter under a constant pressure difference. The filter cake is incompressible, and the resistance of the medium can be ignored. When the filtration pressure difference increases by 50% while the filtration time remains unchanged, what is the percentage increase in its processing capacity? A 50 B 41.4 C 26.3 D 22.5. I’m not very familiar with this aspect of filtration; please advise me. Thank you.
A, 50. The filtration rate is proportional to the driving force; in a pressure-difference filter press, the driving force is the pressure difference, and if this pressure difference increases by 50%, the filtration rate also increases by 50%.
I downloaded the answer to this question from HaiChuan, and it was D; perhaps the answer is wrong.
I’m not sure if it’s correct; I can check the formula.
This post was last edited by tiyiss on 2015-8-9 22:21. For constant differential pressure filtration, the medium resistance is neglected; q^2=Kτ, where K is directly proportional to the filtration pressure difference. Therefore, q^2 is also directly proportional to the pressure difference. q1/q2=（△p1/△p2）^0.5, so the answer is D
Option D should be chosen; V squared is proportional to the pressure difference