Release of K and Cl and Emissions of NOx and SO2 during Reed Black Liquor Combustion in a Fluidized Bed

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• 作者：Xiaoyu Ji ; Haipei Bie ; Yaning Zhang ; Pei Chen ; Wenxuan Fang ; Rushan Bie
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1631-1637
• 全文大小：374K
• ISSN：1520-5029

文摘

For predicting and relieving ash-related problems and harmful gas emissions during fluidized bed combustion, release of K and Cl and emissions of NO_x and SO₂ during reed black liquor (BL) combustion in a fluidized bed were investigated in this study. The effects of bed material (calcium-based zeolite and limestone) and bed temperatures (700–900 °C) were also studied. The results showed that higher temperature favored the K release for both calcium-based zeolite and limestone, and calcium-based zeolite caused lower K release due to the formation of K₃Al(SO₄)₃, KAl(SO₄)₂, and K₂O-Al₂O₃-SiO₂ eutectic compounds. Cl was mainly released in the form of HCl above 700 °C. Moreover, high temperature facilitated Cl release for calcium-based zeolite, whereas it had a complicated effect on Cl release for limestone. Although higher temperature increased the NO_x emission for both calcium-based zeolite and limestone, limestone resulted in higher NO_x emission due to the conversion of fuel N to NO_x under CaO catalysis. Temperature had a slight effect on SO₂ emission for calcium-based zeolite, whereas it decreased the SO₂ emission for limestone. Reed BL combustion generated lower SO₂ emissions with the help of Na₂CO₃ and K₂CO₃, and limestone resulted in much lower SO₂ emission with the help of CaCO₃ and CaO.