CUTTING THE COST OF
COMPLIANCE
Dr. Ian Saratovsky, Gerald Hunt and Martin Dillon, Lhoist North America, suggest how cement producers could achieve the most operationally cost-effective dry sorbent injection (DSI) programme, whilst complying with stringent SO2, HCl and mercury (Hg) emissions limits.
T
he Portland cement (PC) manufacturing process often results in the emission of gaseous pollutants, including SO2, HCl, and mercury (Hg) released from heating of the raw materials as well as firing of solid fuels inside the kiln. Throughout the US and the world, PC production facilities are required to control their acid gas and mercury emissions
due to limits dictated in their operating permits, consent decrees and/or other regulatory mandates. In the United States, the Clean Air Act has previously driven the acid gas emission control requirements; however, other regulations and limits have recently been passed, such as National Ambient Air Quality Standards (NAAQS) which drives increasingly more stringent limits on SO2 emissions.
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