柔性电极湿式静电除尘关键技术工程应用研究

发布时间：2018-06-06 02:17

本文选题：燃煤电厂 + 湿式静电除尘器　；参考：《东南大学》2015年硕士论文

【摘要】：随着我国电力行业的不断发展,粉尘、二氧化硫、氮氧化物等大气污染物排放量不断增加,许多地区污染物排放量超过环境容量,大气污染治理形势十分严峻。对于新的排放限值,传统的干式除尘器已很难满足要求。作为高效除尘的终端精处理设备,湿式静电除尘器(WESP)可以高效、连续地去除烟气中的微细颗粒物,同时其对液滴、S03、重金属等污染物的收集效果比较理想,具有协同脱除多污染物的强大功能。本文首先对我国燃煤电厂粉尘排放现状和存在的问题进行了详细分析,介绍了燃煤电厂烟尘控制技术的新技术、新工艺。对湿式静电除尘技术(WESP)的工作原理、技术特点、在国内外大型燃煤机组的应用现状进行了详细介绍,阐述了目前国内外湿式静电除尘器的技术流派,对其关键技术,如阳极技术、阴极线、结构形式等进行了研究,结合实际工程应用,重点对柔性电极湿式静电除尘关键技术工程应用进行分析研究。实验室研究主要对湿式静电除尘器的气流均布和极线技术进行分析、研究,工程设计实例通过采用柔性电极技术的两台300MW燃煤机组(湖南益阳发电厂#1、#2机组)湿式静电除尘工程项目的对比,对设计过程的分析和总结,结构形式、阴极线等关键技术的优化,CFD流场模拟及实测数据的比对,设计回访,分析了两台机组湿式静电除尘器各自的运行情况,对其中关键技术采用的优化所产生效果的影响因素进行了分析。研究结果表明,合理的结构形式、极线技术,可大大提高湿式静电除尘器的可靠性和稳定性。通过本文研究,获得了部分适合工业应用的设计成果：在国内燃煤电厂具备大规模应用的立式垂直湿式静电除尘器的结构形式；下进上出逆流式结构高效的布置形式；四向放电的2205双相不锈钢刚性芒刺线；六向放电的钛合金刚性鱼骨针刺线等。为进一步推广和应用柔性电极技术湿式静电除尘器提供了理论依据和工程示范。
[Abstract]:With the development of electric power industry in China, the emissions of dust, sulfur dioxide, nitrogen oxide and other atmospheric pollutants are increasing, and the discharge of pollutants exceeds the environmental capacity in many areas, so the situation of air pollution control is very serious. For the new emission limit, the traditional dry dust collector has been difficult to meet the requirements. As a terminal fine treatment equipment for high efficiency dust removal, the wet electrostatic precipitator (WESP) can effectively and continuously remove fine particles from the flue gas. At the same time, the collection effect on droplet S03, heavy metal and other pollutants is relatively ideal. The utility model has the powerful function of synergistic removal of multiple pollutants. In this paper, the present situation and existing problems of dust emission from coal-fired power plants in China are analyzed in detail, and the new technology and technology of dust control in coal-fired power plants are introduced. This paper introduces in detail the working principle and technical characteristics of wet electrostatic precipitator (WESP) and its application status in large coal-fired units at home and abroad, expounds the technical schools of wet electrostatic precipitator at home and abroad, and discusses the key technologies of the wet electrostatic precipitator. Such as anode technology, cathode line, structure form and so on, combined with practical engineering application, the key technology of wet electrostatic dust removal with flexible electrode is analyzed and studied. Laboratory studies mainly focus on the analysis of airflow distribution and pole line technology of wet electrostatic precipitators. Through the comparison of two 300MW coal-fired units (#1 #2 unit, Yiyang Power Plant, Hunan Province) with the flexible electrode technology, the analysis and summary of the design process and the structure form are given. The simulation of CFD flow field and the comparison of measured data with the key technologies such as cathode line are optimized. The design and return visit are carried out, and the respective operation conditions of the two sets of wet electrostatic precipitators are analyzed. The factors influencing the effect of the optimization of the key technology are analyzed. The results show that the reliability and stability of wet electrostatic precipitator can be greatly improved by reasonable structure and pole line technology. Through the research in this paper, some design results suitable for industrial application have been obtained: the structural form of vertical wet electrostatic precipitator with large-scale application in domestic coal-fired power plants, the efficient arrangement of down-in and upflow structure, and the structure of vertical wet electrostatic precipitator with large-scale application in domestic coal-fired power plants; 2205 duplex stainless steel rigid barbed wire with four direction discharge and rigid fishbone needle wire with six direction discharge titanium alloy. It provides theoretical basis and engineering demonstration for further popularization and application of flexible electrode technology for wet electrostatic precipitator.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X773

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