1050MW超超临界燃煤发电机组电除尘器烟尘排放偏高运行分析

Operation Analysis of High Smoke&Dust Emission from Electrostatic Precipitator of 1050MW Ultra-Supercritical Coal-Fired Generating Unit

本文以福建省某百万千瓦3号燃煤发电机组电除尘器为背景,通过问题导向分析、研究解决技术问题。一段时间以来该百万千瓦燃煤机组电除尘器出口烟尘排放周期性波动,而烟气在线监测系统(CEMS)每五分钟采集一次烟尘排放数值,当采集到烟尘排放波动峰值时,会导致烟尘排放小时均值偏高,影响净烟气烟尘的达标排放。通过运行参数分析、推理、试验得出导致该问题的主要原因为进入电除尘器A侧烟气量大于B侧烟气量导致A侧五电场阳极板积灰程度较B侧严重,同时A侧烟气流速高将A侧五电场振打产生的团聚状烟尘携入脱硫系统,进而导致烟尘大幅波动。问题原因找到后,采取“对症下药”的手段对电除尘器进行调整,最终缓解了烟尘大幅波动的问题,对电力行业环保设备管理具有一定的借鉴意义。

This paper takes the electrostatic precipitator of a million-kilowatt No.3 coal-fired generating unit in Fujian Province as the background,and solves technical problems by problem-oriented analysis and research.For a period of time,the emission of smoke and dust from the ESP of this unit fluctuates periodically,and the online flue gas monitoring system(CEMS)collects the value of smoke and dust emission every five minutes.When the fluctuating peak of smoke and dust emission is collected,the hourly average value of smoke and dust emission will be higher,which will affect the standarlized emission of net smoke and dust.By operating parameter analysis,reasoning and experimentation,it is concluded that the main reason for this problem is that the amount of flue gas entering the A side of the electrostatic precipitator is greater than that on the B side,causing the A side five electric field anode plates to accumulate more dust than the B side.At the same time,the high flow rate of the flue gas on the A side will carry the agglomerated flue dust generated by the five electric field rapping on the A side into the desulfurization system,causing the flue gas to fluctuate greatly.After finding the causes of the problem,the electrostatic precipitator is adjusted by means of proper“Acts-to-Situation",which finally alleviated the problem of large fluctuations in smoke and dust,and which has a certain reference significance for the management of environmental protection equipment in electric power industry.