【作者】 张欣；

【导师】 顾璠；

【作者基本信息】 东南大学 ， 热能工程， 2004， 硕士

【摘要】 SO2作为最重要的大气污染物之一,在全世界范围内已引起广泛重视。等离子体脱硫技术作为一种新颖的大气污染物处理技术,与传统烟气脱硫技术相比,以投资少、占地面积小、运行费用低、工艺过程为干式、没有二次污染等独具的诸多特点,成为国际上公认的具有极大市场潜力和良好应用前景的烟气脱硫工艺。作为工业应用的基础性研究,本文结合催化吸附方法和等离子体方法的优点,对烟气等离子体-催化SOx转化脱除进行深入探讨。本文从等离子体发生方法、各种物性参数对脱硫的影响、等离子体-催化SOx转化脱除机理以及化学反应动力学模型和电厂烟气脱硫设备设计方法等方面系统地进行研究。本文首先论述了课题研究的背景和意义,然后对等离子体脱硫理论和应用的研究和发展动态进行综述。由于等离子体和催化吸附反应机理的差异及其相互作用的复杂性,本文进行了大量的实验研究和理论分析。实验以丝光沸石和5A分子筛为催化吸附剂,使用线筒式等离子体反应器,用自制的高压脉冲电源供能,反应器中放电产生的大量活性粒子与SO2反应生成易于分离的物质。研究发现,脱硫效率随着输入能量的增加而增加;O2的加入对脱硫有促进作用;温度对丝光沸石和5A分子筛为催化剂与等离子体联合脱硫起反向作用。丝光沸石和5A分子筛具有较强的吸附性能,作为催化剂与电场填充介质,它们对增强电场,提高脱除效率也有一定作用。理论分析以实验研究结果为依据,说明等离子体产生的O原子、OH自由基、HO2自由基等是催化氧化脱除SO2的主要活性成分。最后,本文将单颗催化剂上气相反应模型与填充床化学反应模型相耦合,说明了等离子体-催化SOx转化脱除的一般模型。更多还原

【Abstract】 As one of the most important air pollutants, SO2 has brought widely peoples all over the world. Removing SO2 with plasma, following the conventional technologies, has become a novel desulfurization technique. With many excellent characteristics of low investment, small operation spot, low operation expenses and etc, this technology has become an internationally accepted and new flue gas desulfurization technics with the most potential market and prosperous prospect. As a basic application research, plasma technique is studied combined with catalyst absorption technique. In this paper such aspects of this novel technology as the producing method of plasma, SO2 reduction mechanism of plasma, effects of each parameter on SO2 reduction, design method and steps of SO2 reduction apparatus of flue gas and were studied systematically so as to control and use the new technology in practice conveniently. The first chapter discussed the background and significance of the task from the practical and theoretical viewpoints. The second chapter shows us the experiment system. The system contains: power supply system, plasma reactor, oven, gas analyzer and so on. There are two kinds of catalyst, one is silk zeolite, the other is 5A molecual sieve. In the experiment a conventional cylindric plasma reactor and a high-voltage pulsed power supply is used. Discharge occurs in the reactor and a large amount of active particles are generated. With the input energy and the content of O2 increasing, the efficiency of DeSO2 increases. The results of the experiment suggested that, silk zeolite and 5A molecual sieve is not a kind of proper catalyst to DeSO2 by plasma. Finally, a modle combining packed bed theory with gas reaction in the surface a single catalyst granule is develop.更多还原