次氯酸钙溶液湿法脱硫脱硝的实验研究

发布时间：2018-01-13 04:31

  本文关键词：次氯酸钙溶液湿法脱硫脱硝的实验研究　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 次氯酸钙 脱硫脱硝 热力学计算

【摘要】：随着我国新的空气质量标准和大气污染物排放物标准的施行,对二氧化硫和氮氧化物的排放提出了更加严格的要求。虽然近年来我国对大气污染的治理取得了一定的效果,污染物排放总量逐年下降,但二氧化硫及氮氧化物的控制仍是大气污染控制的一个重要课题。次氯酸钙又称漂白粉,是一种来源广泛、性质稳定、具有强氧化性的吸收剂。多用于水消毒和废水处理,而鲜见于烟气治理。本研究在阅读了大量的脱硫脱硝文献,总结了国内外脱硫脱硝技术现状的基础上,以次氯酸钙溶液为吸收剂,对SO_2和NO_x进行湿法脱除。论文通过传质机理对次氯酸钙溶液同时脱硫脱硝进行了传质分析,通过热力学计算论证了其脱硫脱硝的可行性,通过反应过程的化学方程分析确定了脱硫脱硝过程的反应机理。同时,通过大量的实验探究了次氯酸钙溶液脱硫脱硝规律:首先,次氯酸钙溶液脱硫脱硝的预实验表明次氯酸钙溶液能够将二氧化硫完全去除,而对氮氧化物的去除效果不佳。通过对不同反应条件对次氯酸钙溶液脱硝的实验研究,确定次氯酸钙溶液脱硝的最佳反应条件为:烟气流量为400 m L·min-1,有效液面高度为80cm,Ca(ClO)_2溶液浓度为0.1wt%,反应温度为60℃,初始pH为12,烟气含氧量为8%,NO入口浓度为800 mg·m~(-3),SO_2浓度为2000 mg·m~(-3);其次,添加剂对脱硝效率的实验结果表明KMnO4的添加能较大程度地促进次氯酸钙溶液的脱硝效率。添加剂存在时,在最佳反应条件下使用次氯酸钙溶液进行同时脱硫脱硝的实验结果表明其脱硫效率为100%,脱硝效率达85%;最后,离子色谱法对同时脱硫脱硝后的产物分析表明次氯酸钙溶液脱硫脱硝的主要产物为SO_4~(2-)和NO_3~-。次氯酸钙溶液同时脱硫脱硝经济性分析说明次氯酸钙溶液脱硫脱硝具有应用前景。
[Abstract]:With the implementation of new air quality standards and emission standards of air pollutants in China. More stringent requirements have been put forward for the emission of sulfur dioxide and nitrogen oxides. Although the control of air pollution in China has achieved certain results in recent years, the total amount of pollutant emissions has decreased year by year. However, the control of sulfur dioxide and nitrogen oxides is still an important subject of air pollution control. Calcium hypochlorite, also known as bleach powder, is a kind of widely source and stable nature. Absorbents with strong oxidizing properties are mostly used in water disinfection and wastewater treatment, but rarely in flue gas treatment. In this study, a large number of desulfurization and denitrification documents have been read, and the status quo of desulfurization and denitrification technology at home and abroad has been summarized. Using calcium hypochlorite solution as absorbent, wet removal of SO_2 and NO_x was carried out. Mass transfer analysis of simultaneous desulfurization and denitrification of calcium hypochlorite solution was carried out through mass transfer mechanism. The feasibility of desulphurization and denitrification is demonstrated by thermodynamic calculation. The reaction mechanism of desulphurization and denitrification is determined by chemical equation analysis of the reaction process. Through a large number of experiments to explore the desulphurization and denitrification of calcium hypochlorite solution: first, the pre-experiment of calcium hypochlorite solution desulphurization and denitrification shows that calcium hypochlorite solution can completely remove sulfur dioxide. But the removal effect of nitrogen oxide is not good. Through the different reaction conditions of calcium hypochlorite solution denitrification experimental study. The optimum reaction conditions for denitrification of calcium hypochlorite solution were determined as follows: flue gas flow was 400ml 路min-1, and the effective liquid level was 80cm. The concentration of Ca(ClO)_2 solution is 0.1 wts. the reaction temperature is 60 鈩，

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