达拉特发电厂#6机组脱硝改造研究

发布时间：2019-07-04 15:46

【摘要】：近年来,随着我国经济的快速发展和工业化水平的显著提高,能源消耗带来的环境污染也越来越严重。大气烟尘、酸雨、温室效应和臭氧层的破坏已成为危害人民生存的四大杀手,其中烟尘、二氧化硫、氮氧化物等有害物质是造成大气污染、酸雨和温室效应的主要根源。在我国,二氧化硫、氮氧化物等有害物质主要是由燃煤过程产生的,约2/3的电力生产来自于燃煤火力发电厂。随着燃煤火力发电厂烟尘、二氧化硫的有效控制和脱硝技术手段的成熟,氮氧化物(NO_X,包括N_2O、NO、NO_2、N_2O_3和N_2O_5等多种化合物)的治理已经成为人们关注的焦点之一,国家也从污染物总量控制的单一目标,提升为环境质量改善和污染物总量控制的双目标。在此背景下,新建火力发电厂普遍采用热效率高的大容量、高参数的机组,选用最新节能设备,并配套完整的除尘、脱硫脱硝装置。已运行机组,进行点火装置、除尘设备、省煤器、凝汽器,汽机调门控制等升级改造,加装脱硫脱硝等装置。本文以达拉特发电厂三期工程#6机组为研究对象,简要分析了课题的研究背景及意义,结合国内外相关课题的研究发展现状趋势,依据达拉特发电厂三期工程#6机组锅炉基本参数及运行现状,提出了采用低氮燃烧和SCR烟气脱硝技术相结合的综合脱硝改造方法,通过了综合脱硝改造的可行性研究论证,进行了脱硝工程的安装调试和性能分析。最终,通过低氮燃烧器改造和增加一套高灰型选择性催化还原法(SCR)脱硝装置,将空预器出口(锅炉脱硝装置入口)NO_X排放浓度由原来约450~850mg/Nm~3控制在100mg/Nm~3以内,达到了预期的氮氧化物控制目标。
文内图片：

图片说明：WR型低NOX燃烧器
[Abstract]:In recent years, with the rapid development of China's economy and the remarkable improvement of industrialization level, the environmental pollution caused by energy consumption is becoming more and more serious. The destruction of atmospheric soot, acid rain, Greenhouse Effect and ozone layer has become the four major killers that endanger the survival of people, among which soot, sulfur dioxide, nitrogen oxides and other harmful substances are the main causes of air pollution, acid rain and Greenhouse Effect. In China, sulfur dioxide, nitrogen oxides and other harmful substances are mainly produced by coal-fired process, about 2 / 3 of the electricity production comes from coal-fired thermal power plants. With the effective control of sulfur dioxide and the maturity of denitrification technology in coal-fired power plants, the treatment of nitrogen oxides (NO_X, including N _ 2O, no _ 2, N _ 2O _ 3 and N_2O_5, etc.) has become one of the focuses of attention. The country has also improved from a single goal of total pollutant control to a dual goal of environmental quality improvement and total pollutant control. Under this background, large capacity and high parameter units with high thermal efficiency are widely used in new thermal power plants, the latest energy saving equipment is selected, and complete dedusting, desulphurization and denitrification devices are equipped. Has operated the unit, carries on the ignition device, the dust removal equipment, the economizer, the condenser, the turbine regulating door control and so on upgrade transformation, installs the desulphurization and denitrification device and so on. This paper takes # 6 unit of the third phase project of Dalat Power Plant as the research object, briefly analyzes the research background and significance of the subject, combined with the research and development trend of the related topics at home and abroad, and according to the basic parameters and operation status of the # 6 unit boiler of the third phase project of Darat Power Plant, puts forward a comprehensive denitrification transformation method combining low nitrogen combustion with SCR flue gas denitrification technology. Through the feasibility study and demonstration of comprehensive denitrification transformation, the installation, debugging and performance analysis of denitrification project are carried out. Finally, through the modification of low nitrogen burners and the addition of a set of high ash selective catalytic reduction (SCR) denitrification unit, the NO_X emission concentration at the outlet of air preheater (inlet of boiler denitrification unit) is controlled within 100mg/Nm~3 by the original 450~850mg/Nm~3, and the expected nitrogen oxide control goal is achieved.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621

【参考文献】