Conversion Characteristics of Aromatic Hydrocarbons in Simulated Gaseous Atmospheres in Reducing Section of Two-Stage Entrained-Flow Coal Gasifier in Air- and O2/CO2-Blown Modes

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• 作者：Yasuhiro Sakurai ; Shuji Yamamoto ; Shinji Kudo ; Koyo Norinaga ; Jun-ichiro Hayashi
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：April 18, 2013
• 年：2013
• 卷：27
• 期：4
• 页码：1974-1981
• 全文大小：357K
• 年卷期：v.27,no.4(April 18, 2013)
• ISSN：1520-5029

文摘

Conversion of refractory aromatic hydrocarbons was studied with an atmospheric flow reactor that simulated the reducing section of a two-stage entrained-flow coal gasifier in air-blown and O₂/CO₂-blown (CO₂ recycling) modes at temperatures of 1100鈥?400 掳C. Mixed vapors of benzene and naphthalene (7/3 on a carbon basis) were fed into the reactor at total concentration in a range from 3.7 to 37 g路Nm^鈥? together with a CO鈥揅O₂鈥揌₂鈥揌₂O mixture in the O₂/CO₂-blown mode or CO鈥揅O₂鈥揌₂鈥揌₂O鈥揘₂ mixture in the air-blown mode. Soot was the major fate of the aromatics at the inlet benzene/naphthalene concentration of 35鈥?7 g路Nm^鈥?, and its yield was not influenced significantly either by the mode of gasification or temperature at 1200鈥?400 掳C. The contribution of gas-phase reforming to the conversion of the aromatics became more important as their inlet concentration decreased. At the inlet concentration of 3.7鈥?.5 g路Nm^鈥?, the O₂/CO₂-blown mode was clearly more effective in reducing the soot yield than the air-blown mode and increasing the gas yield. It was explained on the basis of a detailed chemical kinetic model that the increased partial pressure of CO₂ induced a higher concentration of key active species such as hydroxyl radicals that initiated the oxidative decomposition of the aromatics.