低浓度SO2和NOx自动监测系统性能评价方法

通过对7种废气自动监测系统的比较研究和现场测试,提出了非分散红外法、紫外差分法、紫外荧光法、化学发光法等多种SO2和NO x自动监测技术在低浓度范围实现准确定量监测的性能评价方法,定义了CEMS的系统检出限及其主要影响因素。建议采用系统检出限、线性误差等关键参数作为低浓度CEMS的性能评价方法,提出将全系统多点标准气体校准或加标回收率作为验收和质控监督的基本方法。     

北京市交通微环境汽车尾气污染的浓度特征

对北京市典型交通微环境中(包括公交车站,公交车内以及小轿车内)的汽车尾气污染物CO、NO、NO2和PM2.5浓度进行了监测.结果表明,NO、CO 和PM2.5在交通微环境中的浓度分布相似,均为公交车内浓度最高,公交车站浓度最低.NO2为公交车内浓度最高,小轿车内浓度最低.公交车内CO的早高峰浓度要显著高于晚高峰浓度,普通公交车内的CO、NO和NO2浓度均低于空调车.良好的通风条件可以显著改善公交车车内空气质量.对小轿车车内浓度的影响因素分析表明,选择车流量平峰时段出行、恰当的保养维护车辆、在车辆拥堵区域使用内循环通风模式可以有效地降低车内污染水平.     

Applying model simulation and photochemical indicators to evaluate ozone sensitivity in southern Taiwan

Ozone sensitivity was investigated using CAMx simulations and photochemical indicator ratios at three sites (Pingtung City, Chao- Chou Town, and Kenting Town) in Pingtung County in southern Taiwan during 2003 and 2004. The CAMx simulations compared fairly well with the hourly concentrations of ozone. Simulation results also showed that Pingtung City was mainly a volatile organic compounds (VOC)-sensitive regime, while Chao-Chou Town was either a VOC-sensitive or a NOx-sensitive regime, depending on the seasons. Measurements of three photochemical indicators (H2O2, HNO3, and NOy) were conducted, and simulated three transition ranges of H2O2/HNO3 (0.5–0.8), O3/HNO3 (10.3–16.2) and O3/NOy (5.7–10.8) were adopted to assess the ozone sensitive regime at the three sites. The results indicated that the three transition ranges yield consistent results with CAMx simulations at most times at Pingtung City. However, both VOC-sensitive and NOx-sensitive regimes were important at the rural site Chao-Chou Town. Kenting Town, a touring site at the southern end of Taiwan, was predominated by a NOx-sensitive regime in four seasons.     

“十二五”水泥行业氮氧化物控制技术的经济分析

本文介绍了目前我国水泥行业NOx的排放现状、污染控制政策要求、控制技术及其应用情况。通过调研分析国内几家已采用脱硝技术的水泥企业案例,总结出影响水泥企业NOx控制经济成本的主要因素,并测算出"十二五"水泥行业减排成本。最后提出了促进水泥行业NOx减排工作的政策建议。     

燃气电厂氮氧化物排放控制技术对比分析

目前全球各国都在提倡节能减排,而氮氧化物是造成环境污染的主要物质之一。随着国家新的《火电厂大气污染物排放标准》(GB13223-2011)的实施,对火电厂烟气氮氧化物单位时间排放量提出了明确要求。以新疆克拉玛依电厂燃烧系统改造工程为例,分析国内外氮氧化物排放控制技术的优缺点,并提出最优方案。     

燃烧尾气中NOx选择性还原反应催化剂研究进展

介绍了从燃烧尾气中脱除ＮＯｘ的一系列选择性催化还原体系,其特色为能在氧浓度在较高条件下,利用燃烧尾气中未反应的有机物作还原剂,高选择性地与ＮＯｘ反应,其中负载Ｃｕ的ＺＳＭ－５催化剂有很高的活性,阐述了工业应用中存在的问题及对策。     

氨法烟气脱硫脱硝的技术特征

氨法烟气脱硫脱硝具有显著的技术优势：脱硫效率高。脱硫脱硝一举两得，不耗费热量不产生废渣，脱硫刺利用充分用量小，不损害设备有节能功效。     

Fabric-filter-supported catalyst for removal of harmful solid and gaseous compounds in municipal waste incinerator exhaust gas: characteristics of NO x reduction

We have investigated a fabric-filter-supported catalyst for removing harmful solid and gaseous compounds simultaneously from municipal incinerator exhaust gas. We studied the ways in which the efficiency of NO _x removal is influenced by filter temperature, gas flow rate, and catalyst content. The reduction of the catalyst content by mechanical reverse washing was investigated, and the state of the catalyst supported in the fabric filter was also observed using a scanning electron microscope. The catalyst supported by the fabric filter showed a removal efficiency above 75% when the filter temperature was 200°C, the gas flow rate was 1 m/min, and the catalyst content of the fabric filter was above 300 g/m². The catalyst was supported uniformly on the fibers of the fabric filter, and fine catalyst particles remained on the fibers after mechanical reverse washing. Received: October 15, 1997 / Accepted: March 19, 1999     

W火焰炉低氮燃烧改造可行性研究

对黔北电厂1～4号W火焰锅炉实际运行状态进行分析,得出NO。排放浓度偏高的主要原因,并提出1—4号机组W火焰炉低氮改造的方案,即在拱下燃烧室内组织大回流长火焰燃烧方式,并通过SOFA风形成炉内深度空气分级低氮燃烧。同时针对1、2号炉和3、4号炉各自特性提出具体的改造方案,保证在锅炉效率不降低的条件下,1～4号W火焰锅炉的NOx排放浓度不高于850mg／m3,从而为W火焰锅炉低氮燃烧改造提供可行性方案,保证W火焰锅炉下一步烟气脱硝的顺利进行。     

石灰石—石膏湿法烟气脱硫系统中NO_x浓度变化探讨

介绍了装有石灰石-石膏湿法烟气脱硫系统且配置低NOx燃烧器锅炉的NOx排放状况,探讨烟气中NOx浓度的变化规律和NOx脱除率范围,并比较了原烟气和净烟气中NOx/NO的换算系数,为CEMS监测中的数据换算提供参考.