Discussion
Three of the following raise fan power. Which does not?
Increasing precipitator plate area
Narrowing a cyclone body
Raising the air to cloth ratio
Raising the venturi throat velocity
Answer: C
Correct answer: Increasing precipitator plate area
A precipitator’s pressure drop is very low and adding plate area changes it hardly at all - which is exactly why efficiency is improved that way rather than by driving the gas harder. The other three all raise the resistance the fan must overcome: a narrower cyclone body, a higher filtration velocity through the cake, and a higher venturi throat velocity, whose pressure drop rises with the square of it.
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