摘要
多年来北京市一直致力于改善能源结构,推行燃煤锅炉清洁能源改造等举措,不断提高天然气使用比例,天然气占一次能源的比例从2000年3.1%上升到2012年的16.7%,燃气锅炉的数量、总蒸吨数初具规模。相对燃煤工业锅炉,燃气工业锅炉的主要环境问题是NOx排放,NOx又是二次污染物O3和PM2.5的前体物,从而对空气质量产生影响。该研究选择典型燃气锅炉,对其NOx实际排放浓度进行监测,获取排放因子。结合活动水平,采用排放因子法估算排放量,利用WRF-CMAQ模拟其对空气质量的影响。结果表明:北京市燃气工业锅炉NOx排放因子为2.19 g/m3天然气,采用排放因子法估算全市燃气工业锅炉NOx排放量为9 339 t。对于空气质量影响,不同季度略有差异,全年NOx浓度上升明显,贡献7.2%NO2平均浓度,二次转化为PM2.5不明显,而且夏季由于气温较高,在光化学反应作用下二次转化成臭氧趋势明显。
Beijing was contributed to improve the energy structure for many years,and many measures are taken including the fuel clean of coal-fired boilers,increasing the usage rate of natural gas. In this way,the usage rate of natural gas accounts for primary energy from 3.1% in 2000 to 16.7% in 2012,the amount of gas-fired boilers are being to take shape.Compared to coal-fired industrial boilers,the primary environmental issue is the emission of nitrogen oxide（NOx）which is the precursor of ozone（O3）and fine particulate（PM2.5）,and has a widely influence on the air quality. This paper focused on the typical gas-fired industrial boilers,obtained the emission factor through the monitoring the level of their NOxemission level. Combined with the activity data,emission factors method was used to estimate the emission of NOxfrom gas-fired industrial boilers all over the city,and air quality model was used to simulate the influence on the air quality. Results showed that NOxemission factor of gas-fired boiler in Beijing was 2.19 g/m3（natural gas）,and the emission was estimated at 9 339 ton. For the effect on the air quality,there were differences among seasons,the concentration of NOxrose obviously in general,contributing 7.2% of total yearly-average concentration in the city,and the trend of secondary transformation to PM2.5was not obvious. Due to the high temperature,the transformation from NOxto O3 were observed,and leading to the concentration of O3 rose.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2014年第12期118-122,共5页
Environmental Science & Technology
基金
国家科技支撑计划课题(2013BAC17B01)
2014年度环保公益性行业科研专项(201409005)
北京市环境保护科学研究院科技基金(2014-A-04)
关键词
燃气工业锅炉
大气污染
排放因子
空气质量
gas-fired industrial boiler
air pollution
emission factor
air quality
