Experimental Study on the Effects of Chemical and Mineral Components on the Attrition Characteristics of Coal Ashes for Fluidized Bed Boilers

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• 作者：Tao Wang ; Hairui Yang ; Yuxin Wu ; Qing Liu ; Junfu Lv ; Hai Zhang
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：February 16, 2012
• 年：2012
• 卷：26
• 期：2
• 页码：990-994
• 全文大小：230K
• 年卷期：v.26,no.2(February 16, 2012)
• ISSN：1520-5029

文摘

In this paper, the attrition characteristics of ashes of 25 different coals used in circulating fluidized bed boilers were experimentally studied. The attrition characteristics were described by the attrition rate constant K_af, which was obtained by the static combustion and cold sieving method. The effects of 10 chemical components and 6 mineral components on K_af were evaluated by the gray relational analysis method. The main phases of the mineral components in the coal ashes were determined by X-ray diffraction, and anhydrite (CaSO₄), lime (CaO), quartz (SiO₂), hematite (Fe₂O₃), metakaolinite (Al₂Si₂O₇), and metaillite (KAl₂AlSi₃O₁₁) were identified. The results showed that, for a given mass fraction, the significance of the influence of the ash chemical components on K_af follows the sequence: CaO > MgO > SO₃ > P₂O₅ > Na₂O > Fe₂O₃ > K₂O > TiO₂ > Al₂O₃ > SiO₂. The significance of the influence of the ash mineral components on K_af follows the sequence: lime (CaO) > anhydrite (CaSO₄) > hematite (Fe₂O₃) > metaillite (KAl₂AlSi₃O₁₁) > metakaolinite (Al₂Si₂O₇) > quartz (SiO₂). In addition, the effect of the hardness of individual mineral components on K_af was also discussed.