Discussion
Pressure drop matters in selecting a control device because
Answer: C
Correct answer: It determines the fan power required
The fan must move the whole gas stream against the device’s resistance, and
\[ P = \frac{Q\Delta p}{\eta} \]so pressure drop translates directly into shaft power and therefore into the running cost, which over a plant’s life usually exceeds the capital cost. This is why a venturi scrubber at 10 kPa is expensive to run and a precipitator at a few hundred pascals is cheap.
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