Discussion
Assertion (A): Sulphur trioxide conditioning restores a precipitator's performance on low sulphur coal.
Reason (R): A conductive film on the particle surface brings the dust resistivity back into the workable window.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Low sulphur coal produces a dust of high resistivity, above the workable window, and back corona follows. Injecting sulphur trioxide upstream lays down a thin conductive film of adsorbed acid on the particle surfaces, which lowers the apparent resistivity into the workable range and restores collection. It is a standard retrofit where a plant has switched to a lower sulphur fuel.
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