电站燃煤锅炉全负荷低NOx排放控制技术探讨..docVIP

电站燃煤锅炉全负荷低NOx排放控制技术探讨 　　黄文静1，戴苏峰2，艾春美2，康志宏2 　　(1.上海电力股份有限公司闵行发电厂，上海 200245;2.上海电力股份有限公司，上海 200010) 　　关键词：NOx排放，燃煤锅炉，SCR入口烟温，全负荷低NOx排放控制技术 　　摘 要：随着环保形势的日益严峻，新颁布的《火电厂大气污染物排放标准》对燃煤火力发电厂NOx排放浓度限值提出了更高的要求，研究高效的低NOx排放控制技术刻不容缓。目前国内采用低氮排放控制技术的燃煤机组在额定工况下基本能满足排放要求，但在低负荷时，由于SCR入口烟温低于催化剂正常工作温度窗口而导致脱硝系统无法投运，针对这一问题的主要对策有增加省煤器旁路、提高锅炉给水温度以及开发宽温度窗口SCR脱硝催化剂。目前国内所采用的省煤器旁路烟道等技术是以牺牲一定的经济性为代价的，高效节能的锅炉全负荷低NOx排放控制技术的研究对于逐步改善周围大气环境质量具有显著的经济效益和社会效益。本文旨在为燃煤锅炉进行全负荷低NOx排放控制提供参考。 　　Discussion about Low NOx Emission Control Technology under Full Load in a Coal-Fired Boiler 　　Huang wenjing 1，Dai sufeng 2，Ai chunmei 2，Kang zhihong 2 　　(1.Shanghai Electric Power co.,LTD.Minhang Power Plant，Shanghai 200245; 2.Shanghai Electric Power co., LTD. Shanghai 200010) 　　Abstract: As the environmental situation is becoming more and more serious,the new “Emission standard of air pollutants for thermal power plants”stipulates lower NOx emission concentration limit,so it is urgent to study efficient low NOx emission control technology.Most coal-fired units can meet the emission requirements under rated conditions,but SCR de-NOx system can not work normally because temperature of SCR inlet flue gas is too low when the unit is under low load .The measures to solve the problem is installing economizer bypass, raising boiler feed-water temperature and developing SCR denitration catalyst which can be used under wide temperature range.Economizer bypass technology adopted at home now will lead to low unit efficiency.Study of energy-efficient low NOx emission technology has significant economic and social benefit on improving the atmospheric environment quality.This paper aims at providing reference of controlling NOx emission under full load for coal-fired boiler. 　　Key words：NOx emission;coal-fired boiler;SCR inlet flue gas;low NOx emission control technology under full load 　　1 前言 　　我国是世界上最大的煤炭生产国和消费国，以煤为主的资源禀赋以及石油、天然气等一次能源对外依存度日益增加，决定了燃煤火力发电在我国的电力工业中占主导地位的格局。由于工业不断发展，能源消耗逐年增加，氮氧化物(NOx)的排放量也迅速增加，燃煤电厂(主要是煤粉炉)产生的大气污染物(特