Reed Black Liquor Combustion in Fluidized Bed for Direct Causticization with Limestone as Bed Material

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• 作者：Xiaoyu Ji ; Rushan Bie ; Pei Chen ; Wenbo Gu
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：July 21, 2016
• 年：2016
• 卷：30
• 期：7
• 页码：5791-5798
• 全文大小：386K
• 年卷期：0
• ISSN：1520-5029

文摘

For a reliable and efficient process for the recovery of energy and alkali of reed black liquor (BL), the experiments of reed BL combustion in a fluidized bed with limestone as bed material for direct causticization were conducted at temperatures from 700 to 900 °C. The products in the direct causticizing process were identified by XRD, and the recovery rate of alkali was measured. In addition, the mechanism of inhibiting bed material agglomeration was studied. The results show that a direct causticizing system successfully recovers NaOH when using limestone as bed material, and the recovery rate of NaOH is more than 87.4%. Na₂O·2SiO₂ produced in the combustion process is the main binder of agglomeration. The limestone has a strong effect on inhibiting bed agglomeration, as the decomposition of limestone can provide CaO for the reaction with silica forming high-melting Ca₂SiO₄ and 3CaO·Al₂O₃·3SiO₂ instead of low-melting Na₂O·2SiO₂.