Effects of Oxygen Staging and Excess Oxygen on O2/CO2 Combustion with a High Oxygen Concentration in a Circulating Fluidized Bed

• DOI: 10.1021/ef500051c
• Publication Date: 2014-03-04T16:56:33Z
• Authors: Li Tan; Shiyuan Li; Wei Li; Enguang Shou; Qinggang Lu
• Keywords: Fluidized bed combustion; Limiting oxygen concentration; Chemical-Looping Combustion; Oxy-fuel; Staged combustion

To investigate the effects of oxygen staging and excess on combustion performance gaseous pollutant emission, oxy-fuel experiments with Datong coal were carried out in a 0.1 MWth circulating fluidized-bed (CFBC) apparatus under an O2/CO2 atmosphere total O2 concentration 50%. The resulting CO2 was higher than 90% flue gas most experimental conditions. In combustion, oxygen-staging is new, effective, safe method for improving performance, although flow-staging remains effective. CO initially increased then decreased, while SO2 NO increasing primary flow. increased, secondary flow ratio. Thus, ratio important factor combustion. A improves efficiency inhibits emissions emission.