Pages 175-176
The char which removed 70%∿95% of the chlorine by the thermal cracking of municipal waste at 400∿450℃is burned in a fluidized bed having a superheater made from ordinary low cost tubing and electrical power can be generated with a 30% efficiency by recovering superheated steam (7.85∿9.81MPa, 500℃). At the same time, the pyrolysis gas is burned with air in ash melting furnace of the vertical swirling type, in which ash can be melted continuously at 1300∿1500℃. The slag from the melted ash is reusable in a number of ways. These processes occur when there is more than 1500kcal/kg of LHV of waste. This system is compacted with a low excess air ratio (1.2∿1.3), and pollutant emissions at the outlet of the furnace are reduced.
