基于傅立叶变换红外光谱技术的烟气超低排放监测系统应用研究

中国的大气环境污染形势严峻,地域性大气问题严重,以燃煤为主的火力发电厂、燃煤锅炉等是最主要的SO_2、NO_x排放源。现行的燃煤烟气排放标准做了严格规定,从而对烟气连续排放在线监测技术提出更苛刻的要求。基于傅立叶变换红外光谱技术与伴热式多次反射池技术,研究燃煤电厂SO_2、NO污染气体超低浓度检测系统。针对SO_2、NO的分子吸收光谱特征,采用SiC作为光源,选择测量波段1900～2600 nm;采用傅立叶变换红外光谱技术对测量光谱进行处理,与现场两台设备的测量数据进行分析,SO_2、NO气体的相关性良好,满足超低排放烟气监测需求.

Application of Ultra Low Emission Gas Monitoring System Based on Technology of Fourier Transform Infrared Spectroscopy

The problem of China's atmospheric environmental pollution is grim. Emission source of SO₂ and NO_x comes from thermal power plants, coal-fired boilers which are based on coal burning. The current standard of coal-fired flue gas emission is strictly defined, so that more stringent requirements of on-line monitoring technology for continuous emission of flue gas are put forward. Based on the method of differential absorption spectroscopy, the analyzer of SO₂ and NO pollution gases in coal-fired power plant was studied. According to the absorption spectrum of SO₂ and NO, using SiC lamp as the light source, the measurement band of 1900~2600 nm is carried out. By using the least square method, correlation coefficient of two sets of equipment is calculated. As a result, the analyzer can meet the demand of ultra low emission gas monitoring.