门头沟区燃气锅炉NOx减排时空特征研究

Research on the Spatial and Temporal Characteristics of NO Emission Reduction of Gas-fired Boilers in Mentougou District of Beijing

本研究针对北京市门头沟区112台燃气锅炉开展了现场实测及调研工作,并对低氮改造后的NOx减排时空特征开展了研究。本研究构建了基于Bootstrapping自助抽样法的采用不同低氮改造措施的燃气锅炉NOx排放浓度及排放因子;采用采暖度日数法研究了燃气锅炉大气污染物排放的时间特征,并进一步利用自下而上的排放因子法研究了门头沟区燃气锅炉低氮改造的NOx减排时空特征。研究发现,95%置信区间下执行80mg/m3排放限值的低氮燃烧器及FGR技术的NOx排放浓度分别为0.84~0.88g/m3及0.82~0.88g/m3;执行30mg/m3排放限值的FGR技术及预混燃烧技术的NOx排放浓度分别为0.33~0.36g/m3及0.24~0.33g/m3;未开展低氮改造的燃气锅炉的NOx排放浓度为1.65~1.74g/m3。

In this research, field measurement and investigation were carried out on 112 gas-fired boilers in Mentougou District of Beijing, and the temporal and spatial characteristics of NOx emission reduction after the low-NOx transformation were studied. In this study, the Bootstrap method was used to establish the NOx emission concentration and emission factors of gas-fired boilers with different lowNOx transformation measures. The HDD(heating degree days) method was used to study the temporal characteristics of air pollutants emitted from gas-fired boilers, and the bottom-up emission factor method was used to study the temporal and spatial characteristics of NOx emission reduction after the low-NOx transformation of gas-fired boilers in Mentougou District of Beijing. It was found that at 95% confidence interval, the NOx emission concentration of low-NOx burner and FGR technology with the emission limit of 80 mg/m3 were 0.84-0.88 g/m3 and 0.82-0.88 g/m3 respectively;the NOx emission concentration of FGR technology and premixed combustion technology with the emission limit of 30 mg/m3 was 0.33-0.36 g/m3 and 0.24-0.33 g/m3 respectively;the NOx emission concentration of the gasfired boiler without low-NOx transformation was 1.65-1.74 g/m3.