大型火电厂湿法除尘的研究与应用

发布时间：2018-06-23 05:14

本文选题：大型火电厂 + 湿法除尘　；参考：《西安科技大学》2017年硕士论文

【摘要】：自《火电厂大气污染物排放标准》(GB13223-2011)颁布以来,湿式电除尘器技术得到广泛应用,并首次在大型火电机组——长安益阳发电有限公司(原国电益阳发电有限公司)#1炉300MW燃煤发电机组除尘改造工程成功应用,其引进技术及自主研发技术在国内如雨后春笋般在火电行业进行推广应用。针对超低排放,湿法脱硫产生的二次携带现象,以及绝缘瓷瓶易损性,导致电场绝缘下降的问题,本文对提高电场投运率的问题展开研究,内容包括:(1)对湿法电除尘器阳极材料进行筛选与确定。分析预洗涤水量q1、烟气流量q2以及阳极材料q3等主要参数对气溶胶污染物脱除率的影响。研究与阳极材料匹配的改进安装工艺;确定湿法除尘装置出入口及装置内部速度场的关系;针对湿式电除尘器结构特点,对施工工艺及施工管理办法给出针对性解决方案;(2)湿法除尘器工艺优化研究。通过湿法脱硫后烟气粉尘特性研究,分析湿法电除尘器工目前存在的主要问题,气流流场模拟对进出气封头设计,阳极材料的优化改进;针对湿法除尘系统通常存在的问题,通过有限元分析等技术手段,对湿法电除尘器的流场及关键部件给出关键结构设计。为益阳电厂湿法除尘系统的设计提供基础数据支持。(3)湿法除尘的运行控制研究,优化运行控制工艺,针对绝缘子加热器的特性,设计自整定模糊PID控制器控制电加热系统,建立绝绝缘子电加热系统的数学模型,并对自整定模糊PID控制电加热系统进行仿真验证和改造后的运行效果比较。(4)湿法除尘升级改造及超净排放应用研究。对益阳#1炉柔性阳极的第一代湿式电除尘器提出升级改造技术方案。设计一套全烟气路径分级分布式除尘技术路线,比较传统的仅在电除尘器上进行技术升级的减排路线,给出一套系统解决深度减排的方案。针对大型火电厂的超净排放指标,给出湿法电除尘器的边界条件和全烟气系统解决烟囱口超净排放的系统方案。
[Abstract]:Since the promulgation of the Standard for Atmospheric Pollutant Emission from Thermal Power plants (GB13223-2011), the wet electrostatic precipitator (ESP) technology has been widely used. And for the first time, it has been successfully applied in the retrofitting project of #1 boiler 300MW coal-fired generating set in Changan Yiyang Power Generation Co., Ltd. (former State Power Yiyang Power Generation Co., Ltd). Its imported technology and independent R & D technology in China, such as bamboo shoots in thermal power industry to promote the application. Aiming at the problems of ultra-low emission, secondary carrying phenomenon caused by wet desulphurization, and the vulnerability of insulating porcelain bottle, which lead to the decrease of electric field insulation, this paper studies the problem of increasing electric field operation rate. The main contents are as follows: (1) the anode material of wet electrostatic precipitator is screened and confirmed. The effects of main parameters such as pre-washing water quantity Q1, flue gas flow rate Q2 and anode material Q3 on the removal rate of aerosol pollutants were analyzed. This paper studies the improved installation technology matching with anode material, determines the relationship between the inlet and outlet of wet dust remover and the velocity field inside the device, and aims at the structural characteristics of wet electrostatic precipitator, The solution to the construction process and construction management is given. (2) the optimization of wet dust collector process. Based on the study of flue gas dust characteristics after wet desulphurization, the main problems existing in wet electrostatic precipitator are analyzed, the design of inlet and outlet gas seal by air flow field simulation, the optimization improvement of anode material, and the common problems in wet dust removal system are analyzed. The flow field and key components of wet electrostatic precipitator are designed by means of finite element analysis. It provides basic data support for the design of wet dust removal system in Yiyang Power Plant. (3) Research on operation control of wet dust removal, optimization of operation control technology, design of self-tuning fuzzy pid controller to control electric heating system in view of the characteristics of insulator heater. The mathematical model of insulator electric heating system is established, and the self-tuning fuzzy pid control electric heating system is simulated and compared. (4) the wet dust removal upgrade and the application of super-clean emission are studied. The technical scheme of upgrading the first generation wet electrostatic precipitator with flexible anode for Yiyang #1 furnace is put forward. This paper designs a whole flue gas path hierarchical distributed dust removal technology, compares the traditional emission reduction route that only upgrades the technology on the electrostatic precipitator, and gives a systematic solution to the deep emission reduction. The boundary conditions of wet electrostatic precipitator (ESP) and the scheme of the whole flue gas system to solve the superclean discharge from the chimney mouth are given in accordance with the super-clean emission index of large thermal power plant.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.73

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