Fenton试剂同时脱硫脱硝的理论和实验研究

发布时间：2018-01-05 12:11

本文关键词：Fenton试剂同时脱硫脱硝的理论和实验研究　出处：《上海电力学院》2014年硕士论文　论文类型：学位论文

【摘要】：SO2和NOx是燃煤电厂排放的主要烟气污染物，大量的排放势必会加剧当前存在的一系列环境问题，如酸雨、光化学烟雾。为了降低SO2的排放，燃煤电厂多采用石灰石-石膏湿法脱硫技术（WFGD），该技术比较成熟、可靠而且脱硫效率高，已得到广泛的应用。控制NOx的排放则主要采用选择性催化还原技术（SCR）和非选择性催化还原技术（SNCR）。前者存在占地面积大、系统复杂、投资高和催化剂易中毒等缺点；后者存在脱硝效率较低等不足。因此，如何将脱硫和脱硝装置合二为一，开发一种新型、高效、环境友好型、时脱硫脱硝技术越来越受到关注。本文基于国内外对高级氧化技术（AOPs）在污染物领域的研究，提出利用Fenton试剂（Fe2+/H2O2）同时脱除烟气中的SO2和NO的方法。首先，对Fenton试剂氧化吸收NO的反应动力学进行了研究，计算得出了NO浓度和H2O2浓度的反应级数、反应活化能、指前因子等相关动力学参数，建立了Fenton试剂氧化吸收NO的数学模型。其次，进行了Fenton试剂同时脱除SO2和NO实验，研究了H2O2浓度、NO浓度、反应温度、O2体积分数等相关因素对NO和SO2脱除效率的影响，，采用离子色谱法对反应产物进行了分析，得出反应路径和反应机理。最后，利用响应曲面法建立预测模型，考察各因素交互作用对NO脱除效率的影响。以Fenton试剂为基础，发展形成了多种类Fenton试剂，纳米Fe3O4/H2O2试剂就是其中的一种。本文还就纳米Fe3O4/H2O2试剂氧化吸收NO进行了实验研究，分析H2O2浓度、NO浓度、反应温度等相关因素对其吸收速率的影响，简单分析了该技术的反应机理。
[Abstract]:SO2 and NOx are the main flue gas pollutants emitted by coal-fired power plants. A large number of emissions are bound to aggravate a series of environmental problems, such as acid rain, photochemical smog. In order to reduce the emission of SO2. The wet limestone gypsum desulfurization technology is widely used in coal-fired power plants. The technology is mature, reliable and has high desulphurization efficiency. The control of NOx emissions is mainly by selective catalytic reduction (NOx) and non-selective catalytic reduction (NOx). The former has a large area and complex system. The disadvantages of high investment and easy poisoning of catalyst; Therefore, how to combine desulphurization and denitrification unit into one, develop a new type, efficient, environment-friendly, desulfurization and denitrification technology has been paid more and more attention. This paper is based on the research of advanced oxidation technology (AOPs) in the field of pollutants at home and abroad. A method of simultaneous removal of SO2 and no from flue gas by using Fenton reagent (Fe _ 2 / H _ 2O _ 2) was proposed. The kinetics of oxidation and absorption of no by Fenton reagent was studied. The reaction order, activation energy and preexponential factor of no concentration and H2O2 concentration were calculated. A mathematical model for the oxidation and absorption of no by Fenton reagent was established. Secondly, the simultaneous removal of SO2 and no by Fenton reagent was carried out, and the concentration of no and reaction temperature were studied. The effects of O2 volume fraction on the removal efficiency of no and SO2 were analyzed by ion chromatography, and the reaction path and reaction mechanism were obtained. A prediction model was established by using response surface method to investigate the effect of interaction of various factors on the removal efficiency of no. Based on Fenton reagent, a variety of Fenton reagents have been developed. Nano Fe3O4/H2O2 reagent is one of them. The oxidation and absorption of no by nano Fe3O4/H2O2 reagent are studied experimentally, and the concentration of no in H2O2 is analyzed. The effect of reaction temperature and other related factors on the absorption rate was analyzed.
【学位授予单位】：上海电力学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：X773

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