A dry process desulfurization and denitrification system is a multifunctional emission treatment unit that can remove several toxic substances simultaneously. Unlike conventional wet process units, this dry system contributes to the downsizing of facilities. The one installed at Nagoya Steel Plant of Nippon Steel Corporation has been operating since August 1999 as a large-scale dry process emission treatment system for sintering machines. One of the major characteristics of this system is that it has a dust removal function in addition to the conventional function of removing sulfur and nitrogen from emissions with the use of activated char. SHI succeeded in commercializing this multifunctional dry process emission treatment system for the first time in the world. The system is expected to contribute to environmental conservation as a high-efficiency emission treatment system.