摘要
为定量地综合评价燃煤电厂氮氧化物控制技术,建立了包括环境、技术、经济3个方面共11项指标的多因素多级评价指标体系.采用模糊评价方法,选择低氮燃烧器(LNB)、燃尽风(OFA)、再燃(Reburning)、选择性催化还原(SCR)、选择性非催化还原(SNCR)和SCR/SNCR联合6种典型的氮氧化物控制技术,定量评估其技术、经济和环境性能,以筛选出燃煤电厂最佳适用控制技术组合.案例分析结果表明,对于燃烧贫煤或无烟煤的墙式锅炉,要求脱硝效率>70%,SCR与LNB联用技术是最优选择;对于使用烟煤或褐煤的W火焰和切圆燃烧锅炉,脱硝效率30%即可达标排放,LNB和再燃等燃烧中脱硝技术是最佳选择.因此,在经济较发达、生态环境脆弱的重点地区,建议燃用无烟煤和贫煤的大型机组安装LNB和SCR,燃用烟煤和褐煤的机组或者<100MW机组可考虑LNB和SNCR联用来减少NOx排放;在其它尚有环境容量的地区,建议燃无烟煤和贫煤的机组安装LNB和SNCR,其它机组通过安装LNB减少NOx排放.
A multi-level assessment index system was established to quantitatively and comprehensively evaluate the performance of typical nitrogen oxide control technologies for coal-fired power plants.Comprehensive fuzzy evaluation was conducted to assess six NOx control technologies,including low NOx burner （LNB）,over the fire （OFA）,flue gas reburning （Reburning）,selective catalyst reduction （SCR）,selective non-catalyst reduction （SNCR） and hybrid SCR /SNCR.Case studies indicated that combination of SCR and LNB are the optimal choice for wall-fired boilers combusting anthracite coal which requires NOx removal efficiency to be over 70%,however,for W-flame or tangential boilers combusting bituminous and sub-bituminous coal which requires 30% NOx removal,LNB and reburning are better choices.Therefore,we recommend that in the developed and ecological frangible regions,large units burning anthracite or meager coal should install LNB and SCR and other units should install LNB and SNCR.In the regions with environmental capacity,units burning anthracite or meager coal shall install LNB and SNCR,and other units shall apply LNB to reduce NOx emissions.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2010年第7期1464-1469,共6页
Environmental Science
基金
公益性行业科研专项(200709032)
国家高技术研究发展计划(863)项目(2006AA06A309)
关键词
氮氧化物
控制技术
综合评价
模糊数学
燃煤电厂
nitrogen oxide
control technology
comprehensive evaluation
fuzzy mathematics
coal-fired power plants
