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CEMENT KILN FUEL TREATMENT

CEMENT KILN FUEL TREATMENT

Cement kilns create sulfur emissions which are directly related to the sulfur content of their fuels – primarily coal.  Low sulfur coal is more costly to use compared with high sulfur coal.  In order to comply with EPA limits cement kilns must either use a low sulfur coal at an increased cost or install a sulfur scrubber at the back end of the kiln similar to a coal fired power plant.  The capex for a sulfur scrubber can be 20 – 30 million dollars.  SCB International has developed the following patent pending method of reducing sulfur emissions without the need for a scrubber.

 

“A method of treating cement kiln fuel includes introducing an additive to a fuel component to form a fuel mixture.  The fuel component includes a sulfur-generating combustible fuel and the additive includes a micronized lime component.  The method further includes combusting the fuel component delivered in a combustion zone within a burning zone of a cement kiln.  The sulfur generated by the combustion of the combustible fuel forms sulfur compounds with lime provided by the micronized lime component.  The sulfur compounds fall to a bed of clinker forming along the burning zone and become resident in the clinker”

 

Benefits

  • Reduced SO2 emissions
  • Added directly with the pulverized coal
  • The micronized calcium or magnesium reacts with the sulfur from the fuel to form sulfate
  • Increased sulfate in clinker, requiring less gypsum during finish grinding
  • Ability to use more economical coal with higher sulfur content
  • May be used continuously or as needed (buildups in preheater kilns)