等离子体脱硫相关问题分析及脱硫实验研究

发布时间：2018-01-20 06:18

本文关键词： 低温等离子体介质阻挡放电脱硫机理反应器结构电场分析实验研究　出处：《武汉纺织大学》2015年硕士论文　论文类型：学位论文

【摘要】：围绕国家节能减排政策,新型高效率脱硫脱硝技术的开发研究是当务之急。低温等离子体是一种有效的脱硫脱硝技术,但还需从降低能耗和提高效率等实用角度出发,进行深入系统的研究。论文以低温等离子体脱硫为研究对象,针对其脱硫机理、反应器组成和内部电场、脱硫特性等三方面进行了探索,以期为进一步深入研究合适的实用等离子体脱硫技术提供参考。本文所做主要工作及取得的成果如下:(1)结合文献对等离子体脱硫机理进行了分析,得出:低温等离子体脱除SO2有还原途径和氧化途径两条,其中氧化途径是脱除SO2的主要路径;在氧化途径中,SO2被O、OH等活性自由基氧化,进而被脱除。(2)对等离子体反应器结构组成进行了分析,比较了两种典型的介质阻挡放电结构形式,综合分析它们的加工制作过程和工作时所需的电压,选择了同轴圆柱结构的介质阻挡放电反应器;绝缘介质层是反应器的重要组成部分,其应具备一些特殊的性能,通过比较各种常见介质材料的性能,选择了石英玻璃管作为本实验的介质材料。(3)对等离子体反应器内部电场进行了分析,反应器上的电压越大,产生的电场强度越强,气体更容易被击穿,通过理论研究了反应器最小击穿电压与内电极半径的关系,确定了内电极半径的值。同时,通过实验研究了气体在反应器内的停留时间与脱除率的关系,确定了外电极铜网的长度。(4)搭建等离子体脱硫实验系统并进行了多因素影响下的等离子体脱硫实验研究,得到如下结论:等离子体电源特性对脱除SO2有促进作用,增大电压或提高频率均能在一定程度上减少SO2的排放,提高烟气净化效率;随着O2浓度增大和H2O的加入,SO2脱除率逐渐增大;当O2和H2O共同作用时,SO2脱除率均高于O2和H2O单独作用;接入Ca(OH)2尾气吸收剂,开等离子体前,大部分SO2已被吸收,开等离子体后,无论配气系统中加入O2,还是H2O,还是O2和H2O一起加入,SO2脱除率都为100%。
[Abstract]:Around the national policy of energy saving and emission reduction, it is urgent to develop and study the new high efficiency desulfurization and denitrification technology. Low temperature plasma is an effective desulphurization and denitrification technology. However, it is necessary to study deeply and systematically from the point of view of reducing energy consumption and improving efficiency. This paper takes low temperature plasma desulphurization as the research object, aiming at its desulfurization mechanism, reactor composition and internal electric field. Desulphurization characteristics were explored in three aspects. In order to provide a reference for the further study of suitable practical plasma desulfurization technology. The main work and results obtained in this paper are as follows: 1) the mechanism of plasma desulfurization is analyzed in combination with literature. It is concluded that there are two reduction and oxidation pathways for SO2 removal by low temperature plasma, among which oxidation pathway is the main way to remove SO2. The structure composition of plasma reactor was analyzed by oxidation of so _ 2 by active free radicals such as OOOH and then removed. Two typical dielectric barrier discharge (DBD) structures were compared. The dielectric barrier discharge (DBD) reactor with coaxial cylindrical structure is selected by synthetically analyzing the process of fabrication and the voltage required when they are working. Insulating dielectric layer is an important part of the reactor, it should have some special properties, by comparing the performance of a variety of common dielectric materials. The internal electric field of plasma reactor is analyzed by using quartz glass tube as the dielectric material of this experiment. The larger the voltage in the reactor, the stronger the electric field intensity produced and the more easily the gas can be broken down. The relationship between the minimum breakdown voltage of the reactor and the radius of the inner electrode was studied theoretically, and the value of the radius of the inner electrode was determined. At the same time, the relationship between the residence time of gas in the reactor and the removal rate was studied experimentally. The length of external electrode copper net was determined. (4) the experimental system of plasma desulfurization was set up and the experimental study of plasma desulphurization was carried out under the influence of many factors. The conclusions are as follows: the characteristics of plasma power supply can promote the removal of SO2, increasing the voltage or frequency can reduce the emission of SO2 to a certain extent and improve the efficiency of flue gas purification. The removal rate of so _ 2 increases with the increase of O _ 2 concentration and H _ 2O addition. When O _ 2 and H _ 2O work together, the removal rate of so _ 2 is higher than that of O _ 2 and H _ 2O alone. When the Ca(OH)2 tail gas absorbent is connected, most of the SO2 has been absorbed before the plasma is opened. After the plasma is opened, O _ 2 or H _ 2O are added to the gas distribution system. The removal rate of so _ 2 by adding O _ 2 and H _ 2O is 100%.
【学位授予单位】：武汉纺织大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.3

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