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

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• 作者：Li Tan ; Shiyuan Li ; Wei Li ; Enguang Shou ; Qinggang Lu
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：March 20, 2014
• 年：2014
• 卷：28
• 期：3
• 页码：2069-2075
• 全文大小：387K
• 年卷期：v.28,no.3(March 20, 2014)
• ISSN：1520-5029

文摘

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