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Study on Emission Control of NO x and N 2 O in a Fly‐ash Recycle Fluidized Bed Test Rig
Author(s) -
Zhong Z.,
Lan J.,
Jin B.,
Han Y.
Publication year - 2000
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500080308
Subject(s) - anthracite , fluidization , fly ash , fluidized bed , coal , analytical chemistry (journal) , fluidized bed combustion , bottom ash , waste management , combustion , mineralogy , materials science , environmental engineering , metallurgy , chemistry , environmental science , environmental chemistry , engineering , organic chemistry
Experiments on NO x and N 2 O release characteristics and emission control were studied in a fly‐ash recycle fluidized bed test rig. The total height of the fluidized bed is 4.4m. The fluidization section is 1.2m high with a cross‐section 0.23mx0.23m. The freeboard is 3.0m high with a cross‐section 0.460mx0.345m. The coal‐fired weight of the test rig is 30 kg/h, and coal is fed by a screw feeder. Fine ash is collected by a cyclone and recycled to the bed surface through a J‐valve, slag is then removed from the bottom. An oil‐fired start‐up burner is also used. Test fuels are Xuzhou bituminite and Kenan anthracite from China with particle range of 0‐8mm. When the bed temperature rises, NO x increases and N 2 O decreases. At the same temperature, N 2 O emission of bituminite is less than that of anthracite. While the secondary air ratio reached 15% under staged combustion, NO x emission decreased to 14% and N 2 O emission decreased to 24%. As the Ca/S molar ratio increases, NO x emission also increases while N 2 O emission decreases. Ammonia injection decreases NO x emission significantly, but it has no effect on the emission of N 2 O.