Co-firing of pine chips with Turkish lignites in 750kWth circulating fluidized bed combustion system.
Two Turkish lignites which have different sulfur levels (2-2.9% dry) and ash levels (17-25% dry) were combusted with a Turkish forest red pine chips in a 750kW-thermal capacity circulating fluidized bed combustor (CFBC) system. The combustion temperature was held at 850±50°C. Flue gas emissions were measured by Gasmet DX-4000 flue gas analyzer. Two lignites were combusted alone, and then limestone was added to lignites to reduce SO2emissions. Ca/S=3 was used. 30% percent of red pine chips were added to the lignites for co-firing experiments without limestone in order to see the biomass effects. The results showed that with limestone addition SO2concentration was reduced below the limit values for all lignites. CO emissions are high at low excess air ratios, gets lower as the excess air ratio increases. During co-firing experiments the temperature in the freeboard was 100-150°C higher as compared to coal combustion experiments.
Middle East Technical University, Department of Environmental Engineering, 06800 Ankara, Turkey. Electronic address: aatimtay@metu.edu.tr.
Aysel T
AT
Atimtay
TUBITAK-MRC, Energy Institute, P.O. Box 21, Gebze 41470, Kocaeli, Turkey.
Ufuk
U
Kayahan
TUBITAK-MRC, Energy Institute, P.O. Box 21, Gebze 41470, Kocaeli, Turkey.
Alper
A
Unlu
TUBITAK-MRC, Energy Institute, P.O. Box 21, Gebze 41470, Kocaeli, Turkey.
Berrin
B
Engin
Middle East Technical University, Department of Environmental Engineering, 06800 Ankara, Turkey.
Murat
M
Varol
Ege University, Solar Energy Institute, 35100 Bornova, Izmir, Turkey.
Hayati
H
Olgun
Istanbul Technical University, Department of Chemical Engineering, Maslak 34469, Istanbul, Turkey.
Husnu
H
Atakul
D056804:Biofuels; D018533:Biomass; D002119:Calcium Carbonate / Q000737:chemistry; D002248:Carbon Monoxide / Q000032:analysis; D003031:Coal; D060729:Coal Ash; D004867:Equipment Design; D028223:Pinus / Q000737:chemistry*; D012037:Refuse Disposal / Q000295:instrumentation / Q000379:methods*; D013696:Temperature; D014421:Turkey
D056804:Biofuels; D003031:Coal; D060729:Coal Ash; D002248:Carbon Monoxide; D002119:Calcium Carbonate
Circulating fluidized bed; Co-combustion; Coal and biomass; Emissions; Pilot scale combustor