considered. A medium-sized line was considered, treating an offgas
flow rate of 110,000 N m3/h. The plant was assumed to operate
8000 h/year. The required flue gas cleaning performance was set
imposing an outlet HCl concentration of 2 mg/N m3, 5 times below
the emission limit value set by Directive 2010/75/EU. This conservative
choice is adopted by several plant operators, in order to
guarantee a safety margin for HCl, which is the most critical pollutant
in the MSWI context, and to assure at the same time that the
emission concentrations of the other less abundant acid gases (SO2,
HF) under typical process conditions are as well below their emission
limits