Alkali/chloride release during refuse incineration on a grate: Full-scale experimental findings

摘要: Abstract Waste to energy (WtE) plants are utilised for the production of heat and electricity. However, due corrosion at super heater surfaces a relatively low 25% waste lower heating value can with present technology be converted High contents Cl, Na, K, Zn, Pb S in cause high rates. The Cl-content is one key-factors volatilisation alkali heavy metals WtE plants. Little known about release Pb, along grate incineration 26 t h − 1 plant Vestforbraending unit 5 Denmark was used measurements temperature, gas-concentration (O 2 /CO/CO ), sampling gas phase S. Unit has 6 ports distributed 13 m long between 1.5–1.8 m above grate. Five these were measurements. Two aqueous absorption systems containing solution NH 3 or H O /HNO collect gaseous samples. Tar found condense system near fuel inlet. experiments showed majority K volatilised during early stages combustion. maximum measured port as 177 ppm v , 71 ppm 44 ppm respectively. average temperature 1140 compared temperatures 4 816 551 It been suggested use flue from area that contains amounts corrosive elements, lead separate thus increase electrical efficiency.