Abstract
The author describes how RMC Lonestar's Santa Cruz Plant dealt with the problem of sulfur dioxide emissions. He discusses the systematic approach the plant employed to learn about the origin of the SO/sub 2/ problem and the experimental projects carried out to collect the data to design a system to control SO/sub 2/ emissions. He describes the development of a pilot plant dry scrubber for SO/sub 2/ control and the implementation of the ultimate alkaline slurry injection system (ASIS). He also examines the systems effectiveness in controlling SO/sub 2/ and its limitations. The ASIS is the only one employed in the cement industry today in the United States for SO/sub 2/ control and it is enabling the Santa Cruz Plant to comply with the permitted SO/sub 2/ emissions. This experience underscores the importance of sulfides in the raw materials as a source of emissions and the cost effectiveness of hydrated lime slurry addition when moderate SO/sub 2/ reductions are required from the preheater system. >
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