2018年第4期（总第244期）
doi:10.3969/j. issn. 1009 3230.2018.04.006
应用能源技术
制粉系统运行方式对锅炉NOx排放特性
影响的试验研究丁建良，管诗，邹磊，岳峻峰
（江苏方天电力技术有限公司，南京211102）
摘要：以某660MW超超临界机组锅炉为研究对象，通过现场试验方法，研究了制粉系统运行方式，如煤粉细度、一次风量、磨煤机出口温度、煤粉分配均匀性及磨煤机组合方式等对锅炉出口NOx排放特性的影响规律。结果表明：煤粉细度对NOx排放浓度影响较大，煤粉粒径越
23
小,NOx排放浓度越低；随着磨煤机入口风量的降低，NOx排放浓度呈先降后增的势；磨煤机出口煤粉分配偏差的改善使主燃烧区的热负荷更均匀，从而抑制了NOx的生成；提高磨煤机出口风粉温度，NOx生成量增加，排烟温度降低；而磨煤机的组合运行方式通过改变炉内的燃烧状态和温度分布来影响NOx的生成量。
关键词：超超临界锅炉；制粉系统；运行方式；NOx排放
中图分类号：TK229.4
文献标志码：B
文章编号：10093230(2018)040023-05
EffectsofPulverizingSystemOperationMode
onNOxEmissioninBoiler
DING Jian liang, GUAN Shi pian, ZOU Lei, YUE Jun -feng
(Jiangsu Frontier Electric Technology Co.,Ltd.Nanjing 211102,China)
Abstract: Experiments on pulverizing system were conducted for a 660 MW ultra supercritical boiler in a power plant. The influence of some major factors such as coal fineness, the primary air flow rate, the outlet temperature of coal mills, deviation among pipes and the combination mode of coal mills on NOx emission were studied. The test results showed that coal fineness had great influence on NOx emission; The smaller fineness of pulverized coal, the lower NOx emission concentration. With the reduction of the primary air flow rate, NOx emission concentration decreased first and increased later on. The improvement of the distribution deviation of pulverized coal among the conveying pipes made the thermal load of the main combustion zone more uniform, and the formation of NOx was inhibited. With the rise of the outlet temperature of coal mills, NOx emission increased while the exhaust gas temperature decreased. The combination mode of coal mills had the effect on NOx emission by changing the combustion and temperature distribution in the fumace.
Key words: Ultra supercritical boiler; Pulverizing system; Operation mode; NOx emission
0引言
在燃煤火力发电厂排放的各种大气污染物中，氮氧化物（NOx)对生态环境的危害极大且难
收稿日期：2018-01-07
修订日期：2018-02-15
作者简介：丁建良（1969-），男，高级工程师，主要从事火电
机组启动调试及性能试验相关工作。
万方数据
以控制，包括我国在内的世界上许多国家均相继立法限制燃煤电站锅炉的NOx排放浓度。随着我国国民经济的发展及环境的日益恶化，更严格的NOx排放控制要求早已提上日程)。大量的实践和研究表明，NOx是可以通过改进锅炉燃烧方式来降低其排放量[3-5)。对电厂来说，降低 NOx排放最经济和快捷的方法是通过调整燃烧过