The effect of hydrogen peroxide solution on SO2 removal in the semidry flue gas desulfurization process.
The effect of hydrogen peroxide solution on SO2 removal in the semidry flue gas desulfurization process.
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DOI：
10.1016/j.jhazmat.2009.04.075
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发表时间：
2009-10
影响因子：
13.6
通讯作者：
Yuegui Zhou;X. Zhu;Jun Peng;Yaobin Liu;Di Zhang;Mingchuan Zhang
中科院分区：
文献类型：
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作者：
Yuegui Zhou;X. Zhu;Jun Peng;Yaobin Liu;Di Zhang;Mingchuan Zhang
采用过氧化氢溶液对Ca（OH）2颗粒进行增湿处理，提高其对SO2的吸收效率，解决半干法烟气脱硫（FGD）过程中反应产物的再利用问题。在实验室规模的喷雾反应器中，考察了H2 O2浓度、Ca/S摩尔比和绝热饱和温度对脱硫效率的影响。通过X射线衍射（XRD）和参考强度比（RIR）法对产物样品进行分析以获得矿物组成的半定量测量，并通过扫描电子显微镜（SEM）检查样品的形貌。与喷水增湿Ca（OH）2相比，喷淋1- 3 wt.%的双氧水可显著提高脱硫效率由于过氧化氢溶液促进了SO2的溶解和吸收速率，因此对Ca（OH）2进行增湿。XRD和SEM分析表明，随着H2 O2浓度的增加，脱硫产物中未反应的Ca（OH）2含量减少，而稳定的硫酸钙含量增加。在此基础上，阐明了过氧化氢溶液喷雾增湿Ca（OH）2强化吸收SO2的过程机理。
The present study attempts to use hydrogen peroxide solution to humidify Ca(OH)2particles to enhance the absorption of SO2to achieve higher removal efficiency and to solve the valuable reuse of the reaction product in the semidry flue gas desulfurization (FGD) process. Experiments were carried out to examine the effect of various operating parameters including hydrogen peroxide solution concentration, Ca/S molar ratio and approach to adiabatic saturation temperature on SO2removal efficiency in a laboratory scale spray reactor. The product samples were analyzed to obtain semi-quantitative measures of mineralogical composition by X-ray diffraction (XRD) with reference intensity ratio (RIR) method and the morphology of the samples was examined by scanning electron microscope (SEM). Compared with spraying water to humidify Ca(OH)2, SO2removal efficiency was improved significantly by spraying hydrogen peroxide solution of 1–3wt.% to humidify Ca(OH)2because hydrogen peroxide solution enhanced the dissolution and absorption rate of SO2. Moreover, XRD and SEM analyses show that the desulfurization products contain less amount of unreacted Ca(OH)2and more amount of stable calcium sulfate with increasing hydrogen peroxide solution concentration. Thus, the process mechanism of the enhanced absorption of SO2by spraying hydrogen peroxide solution to humidify Ca(OH)2was elucidated on the basis of the experimental results.