5 17 an esp is treating the flue gas from a coal combustion unit and a
5.17 An ESP is treating the flue gas from a coal combustion unit and
achieving a 97% PM removal efficiency. Suddenly the efficiency
drops to 92%, but the gas flow rate has remained exactly the same.
a. Estimate the ratio of the new effective drift, velocity (w.) to the
b. Under the old conditions (while achieving 97% efficiency), the
fly-ash resistivity was measured at 3.16 (10)10 ohm-cm. Esti-
mate the value of the new drift velocity, m/min.
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