Discussion
Arrange the causal chain of back corona in a precipitator:
1. A high resistivity dust layer builds on the collecting plate
2. The layer holds its charge rather than conducting it away
3. A reverse discharge forms within the layer
4. The effective field collapses and collection efficiency falls
Select the correct sequence.
Answer: C
Each step follows from the one before, and the whole chain is set off by a dust property rather than by any fault in the equipment. Sulphur trioxide conditioning attacks it at the second step by making the layer conductive.
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