A coal with 4 percent sulfur, conservatively, will require 32 tons* of limestone per hour, or 0.064 tons per MWe per hour.
Coal with sulfur doesn't need limestone 
mnli hypothesis: Coal with sulfur doesn't need limestone  premise: A coal with 4 percent sulfur, conservatively, will require 32 tons* of limestone per hour, or 0.064 tons per MWe per hour.