基于湿法脱硫的激冷水合镁渣脱硫性能研究
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摘要
基于镁渣湿法脱硫工艺,将炽热镁渣进行激冷水合处理,实验研究了激冷水合镁渣的脱硫能力和溶解特性;根据缩核模型,建立了镁渣溶解反应模型,得到了镁渣的活化能。通过XRD及SEM分析了镁渣激冷水合前后物质结构和形貌变化。结果表明:镁渣激冷水合保留了较多高活性的β-C_2S,同时在表面形成了具有丰富比表面积的凝胶状水合产物CSH,进而提高了镁渣的脱硫性能;激冷温度越高,脱硫性能也越强,激冷温度在950℃下镁渣的溶解转化率可达84.7%,饱和脱硫时间可达60 min,其活化能为17.47 kJ/mol,比相同反应条件石灰石的活化能低。
Based on the application in wet desulfurization, the desulfurization performances of quenching hydration magnesium slag were studied in this article. The mathematical model was established, and the activation energy of quenching hydration modified magnesium slag was calculated. XRD and SEM were used to analyze the structure and morphology of magnesium slag before and after quenching hydration. The results showed that during quenching, higher active β-C_2S was retained, meanwhile a gel-like hydration product CSH with rich specific surface area was formed on the surface, which improved the desulfurization performances of magnesium slag. The higher the quenching temperature, the higher the desulfurization performance. The dissolution conversion rate of 950 ℃ quenching hydration magnesium slag can reach 84.7% and the saturation desulphurization time can reach 60 min. The activation energy is 17.47 kJ/mol, less than the limestone's.
Based on the application in wet desulfurization, the desulfurization performances of quenching hydration magnesium slag were studied in this article. The mathematical model was established, and the activation energy of quenching hydration modified magnesium slag was calculated. XRD and SEM were used to analyze the structure and morphology of magnesium slag before and after quenching hydration. The results showed that during quenching, higher active β-C_2S was retained, meanwhile a gel-like hydration product CSH with rich specific surface area was formed on the surface, which improved the desulfurization performances of magnesium slag. The higher the quenching temperature, the higher the desulfurization performance. The dissolution conversion rate of 950 ℃ quenching hydration magnesium slag can reach 84.7% and the saturation desulphurization time can reach 60 min. The activation energy is 17.47 kJ/mol, less than the limestone's.
引文
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[3] 钟秦, 刘爱民. 湿法烟气脱硫中石灰石的溶解特性[J]. 南京理工大学学报, 2000, 24(6): 561-569.
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[5] 唐晓兰, 王伯铎, 马俊杰, 等. 石灰石矿山露天开采的生态环境影响分析及保护对策[J]. 水土保持学报, 2002, 16(4): 105-111.
[6] ALTUN N E. Assessment of marble waste utilization as an alternative sorbent to limestone for SO2 control [J].Environmental Progress, 2014, 128: 461-470.
[7] 侯宇. 添加剂改性炽热镁渣激冷水合脱硫剂的实验研究[D]. 太原: 太原理工大学, 2017.
[8] 陈玉洁, 韩凤兰, 罗钊. 镁渣固化/稳定污酸渣中重金属铜和镉[J]. 无机盐工业, 2015, 47(7): 48-51.
[9] FAN B G, YANG J, ZHENG X R, et al. New investigation of magnesium slag as desulfurizer[J]. Advanced Materials Research, 2011, 356: 1853-1859.
[10] 田文玉, 唐伯明, 俞志龙. 煅烧温度对磨细锶渣强度活性的影响[J]. 建筑材料学报, 2009, 12(2): 136-140.
[11] 姬克丹, 侯宇, 邓贺, 等.激冷水合改性镁渣脱硫剂性能实验[J]. 环境工程学报, 2016, 10(12): 7235-7240.
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[13]王观华, 施正伦. 灰渣冷却活化新方法试验研究[J]. 电站系统工程, 2003, 19(1): 31-33.
[14] 沈德勋, 黄文熙, 钱光人. 硅酸二钙活性的研究[J]. 武汉工业大学学报, 1995, 31(1): 33-37.
[15] SHAHSAVARI R, CHEN L, TAO L. Edge dislocations in dicalcium silicates: Experimental observations and atomistic analysis[J]. Cement and Concrete Research, 2016, 90: 80-88.
[16] SALMI T, GRENMAN H, WARNA J, et al. New modeling approach to liquid–solid reaction kinetics: From ideal particles to real particles[J]. Chemical Engineering Research and Design, 2013, 91(8): 1876-1889.
[17] KOECH L, RUTTO H, EVERSON R, et al. Semi-Empirical Model for Limestone Dissolution in Adipic Acid for Wet Flue Gas Desulfurization[J]. Chemical Engineering Technology, 2014, 2(48): 1919-1928.
[18] 童艳, 周屈兰, 惠世恩, 等. 电石渣在湿法脱硫中的消溶特性[J]. 动力工程, 2006, 26(6): 884-887.
[19] UKAWA N,TAKASHINA T, OSHIM M. Effects of Salts on Limestone Dissolution Rate in Wet Limestone Flue Gas Desulfurization[J]. Environmental Progress, 1993, 12(4): 294-299.
[20] 陈凯锋, 薛正良, 李建立. 高温煅烧下快速加热石灰石的热分解反应动力学[J]. 硅酸盐学报, 2016, 44(5): 754-762.
[2] SHIH S M, LIN J P. Dissolution rates of limestone of different sources [J]. Journal of Hazardous Materials, 2000, 79(1): 159-171.
[3] 钟秦, 刘爱民. 湿法烟气脱硫中石灰石的溶解特性[J]. 南京理工大学学报, 2000, 24(6): 561-569.
[4] CARLETTI C, BLASIO C D, MAKILA E, et al. Optimization of a Wet Flue Gas Desulfurization Scrubber through Mathematical Modeling of Limestone Dissolution Experiments[J]. Environmental Progress, 1993,12(4): 294-300.
[5] 唐晓兰, 王伯铎, 马俊杰, 等. 石灰石矿山露天开采的生态环境影响分析及保护对策[J]. 水土保持学报, 2002, 16(4): 105-111.
[6] ALTUN N E. Assessment of marble waste utilization as an alternative sorbent to limestone for SO2 control [J].Environmental Progress, 2014, 128: 461-470.
[7] 侯宇. 添加剂改性炽热镁渣激冷水合脱硫剂的实验研究[D]. 太原: 太原理工大学, 2017.
[8] 陈玉洁, 韩凤兰, 罗钊. 镁渣固化/稳定污酸渣中重金属铜和镉[J]. 无机盐工业, 2015, 47(7): 48-51.
[9] FAN B G, YANG J, ZHENG X R, et al. New investigation of magnesium slag as desulfurizer[J]. Advanced Materials Research, 2011, 356: 1853-1859.
[10] 田文玉, 唐伯明, 俞志龙. 煅烧温度对磨细锶渣强度活性的影响[J]. 建筑材料学报, 2009, 12(2): 136-140.
[11] 姬克丹, 侯宇, 邓贺, 等.激冷水合改性镁渣脱硫剂性能实验[J]. 环境工程学报, 2016, 10(12): 7235-7240.
[12] 李向阳. 石灰石-石膏湿法烟气脱硫石灰石活性实验研究[D]. 南京: 南京理工大学, 2004.
[13]王观华, 施正伦. 灰渣冷却活化新方法试验研究[J]. 电站系统工程, 2003, 19(1): 31-33.
[14] 沈德勋, 黄文熙, 钱光人. 硅酸二钙活性的研究[J]. 武汉工业大学学报, 1995, 31(1): 33-37.
[15] SHAHSAVARI R, CHEN L, TAO L. Edge dislocations in dicalcium silicates: Experimental observations and atomistic analysis[J]. Cement and Concrete Research, 2016, 90: 80-88.
[16] SALMI T, GRENMAN H, WARNA J, et al. New modeling approach to liquid–solid reaction kinetics: From ideal particles to real particles[J]. Chemical Engineering Research and Design, 2013, 91(8): 1876-1889.
[17] KOECH L, RUTTO H, EVERSON R, et al. Semi-Empirical Model for Limestone Dissolution in Adipic Acid for Wet Flue Gas Desulfurization[J]. Chemical Engineering Technology, 2014, 2(48): 1919-1928.
[18] 童艳, 周屈兰, 惠世恩, 等. 电石渣在湿法脱硫中的消溶特性[J]. 动力工程, 2006, 26(6): 884-887.
[19] UKAWA N,TAKASHINA T, OSHIM M. Effects of Salts on Limestone Dissolution Rate in Wet Limestone Flue Gas Desulfurization[J]. Environmental Progress, 1993, 12(4): 294-299.
[20] 陈凯锋, 薛正良, 李建立. 高温煅烧下快速加热石灰石的热分解反应动力学[J]. 硅酸盐学报, 2016, 44(5): 754-762.
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