钢渣碳酸盐化的动力学模型
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摘要
钢渣碳酸盐化反应可以有效的消解钢渣中的f-CaO,稳定钢渣的物理化学性质。采用未反应核模型对钢渣碳酸盐化反应的动力学进行了研究,通过查阅文献找出了反应过程颗粒孔隙结构相关参数的变化规律,由此修正了扩散系数,得出扩散系数与转化率之间的关系。根据修正后的模型对不同粒度钢渣反应控制环节进行了判断,通过综合考虑钢渣碳酸盐化的粒径应控制在180μm之内。
Steel slag carbonate reaction can effectively transform free calcium oxide in steel slag into the carbonates and achieve the purpose of volume stabilization. The carbonation process of steel slag and the kinetics were studied with unreacted core model in this paper. The variation of the particle pore mechanism during the reaction process was found out according to the literatures, the diffusion coefficient was corrected then the relationship between the diffusion coefficient and the conversion ratio was obtained. According to this model, the controlling process of the reaction of different particle size was judged. It was found that the particle size of steel slag should be controlled within 180 μm.
Steel slag carbonate reaction can effectively transform free calcium oxide in steel slag into the carbonates and achieve the purpose of volume stabilization. The carbonation process of steel slag and the kinetics were studied with unreacted core model in this paper. The variation of the particle pore mechanism during the reaction process was found out according to the literatures, the diffusion coefficient was corrected then the relationship between the diffusion coefficient and the conversion ratio was obtained. According to this model, the controlling process of the reaction of different particle size was judged. It was found that the particle size of steel slag should be controlled within 180 μm.
引文
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[11] 吴芸芸, 易德莲, 梁永和, 等. 氧化钙碳酸化反应动力学研究[J]. 武汉科技大学学报, 2005, 28(2):144-147.
[12] 危日光, 陈江涛, 陈鸿伟,等. 石灰石煅烧/碳酸化过程中微观结构的演变特性[J]. 动力工程学报, 2013, 33(2):147-152.
[13] 董晓丹. 转炉钢渣快速吸收二氧化碳试验初探[J]. 炼钢, 2008, 24(5):29-32.
[2] 唐卫军, 廖洪强, 周宇,等. 转炉渣中游离氧化钙的分布及稳定化研究[J]. 炼钢, 2009, 25(3):34-36.
[3] YU J, WANG K B. Study on characteristics of steel slag for CO2 capture [J]. Energy & Fuels, 2011, 25(11): 5483-5492.
[4] 董晓丹. 转炉钢渣快速吸收二氧化碳试验初探[J] . 炼钢,2009,24(5): 29-32.
[5] HUIJGEN W J J, RUIJG G J, COMANS R N J, et al. Energy consumption and net CO2 sequestration of aqueous mineral carbonation[J]. Industrial & Engineering Chemistry Research, 2006, 45(26):9184-9194.
[6] SUN P, GRACE J R, LIM C J, et al. A discrete-pore-size-distribution-based gas-solid model and its application to the CaO+CO2reaction[J]. Chemical Engineering Science, 2008, 63(1):57-70.
[7] QIU K, LINDQVIST O. Direct sulfation of limestone at elevated pressures[J]. Chemical Engineering Science, 2000, 55(16):3091-3100.
[8] ALVAREZ E, GONZáLEZ J F. High pressure thermogravimetric analysis of the direct sulfation of Spanish calcium-based sorbents [J]. Fuel, 1999, 78(3):341-348.
[9] ZEVENHOVEN R, YRJAS P, HUPA M. Sulfur dioxide capture under PFBC conditions: the influence of sorbent particle structure[J]. Fuel, 1998, 77(4):285-292.
[10] 曹同友. 石灰碳酸化动力学研究[J]. 武钢技术, 2010, 48(3):21-23.
[11] 吴芸芸, 易德莲, 梁永和, 等. 氧化钙碳酸化反应动力学研究[J]. 武汉科技大学学报, 2005, 28(2):144-147.
[12] 危日光, 陈江涛, 陈鸿伟,等. 石灰石煅烧/碳酸化过程中微观结构的演变特性[J]. 动力工程学报, 2013, 33(2):147-152.
[13] 董晓丹. 转炉钢渣快速吸收二氧化碳试验初探[J]. 炼钢, 2008, 24(5):29-32.