Material flows and investment costs of flue gas cleaning systems of municipal solid waste incinerators

The aim of this study is a comparison of different kinds of flue gas cleaning systems of municipal solid waste incinerators (MSWI). This comparison will be done with the aid of material flow analysis. In addition, investment costs will be taken into consideration. The main topic of the investigation is the relationship between type of flue gas cleaning system and resulting material flow including auxiliary chemicals and solid residues. Material flow analyses are performed by model calculations. Data used for these calculations are representative of operating values for technical-scale plants. As starting point a model plant with grate firing is considered. For this plant 10 different flue gas cleaning systems are analysed, 6 of them being equipped with a wet cleaning system. Additionally, 2 systems operating in a semi dry sorption and 2 systems operating in conditioned dry sorption are taken into account. The system boundaries for the material flow analysis performed include the entire flue gas cleaning system, starting with the raw gas downstream of the boiler and ending downstream of the stack. The elements chlorine (Cl), sulfur (S), mercury (Hg), cadmium and lead are considered. As a result of this work, two flue gas cleaning concepts seem to be very interesting for the construction of new plants: A plant with a wet flue gas cleaning system equipped with fabric filter followed by a two-stage scrubber system generates small amounts of residues by low investment costs. Moreover, semi dry sorption seems to be a respectable alternative, but this study shows that the operation of the semi dry sorption can be optimized. (orig.)Available from TIB Hannover: ZA 5141(6726) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman