研究了多种气体共存条件下,烟气分析仪中电化学传感器的干扰影响,选择了CO、SO2、NO、NO2、CH4 等气体进行了零点干扰试验和交叉干扰试验.试验结果表明:CO气体对SO2 气体传感器呈正方向干扰,NO和NO2 气体对SO2 气体传感器呈负方向干扰,NO2 对其干扰程度最大,每增加 100 mg/m3 的NO2 气体,SO2 传感器的示值减小 0.173%;NO气体对CO气体传感器呈正方向干扰且干扰程度最大,每增加 100 mg/m3 的NO气体,CO传感器的示值增大 0.116%,CH4 气体对CO气体传感器呈负方向干扰,不同浓度梯度的CH4 气体对CO气体传感器的干扰相近,每增加 100 mg/m3 的CH4 气体,CO传感器的示值减小 0.005%.
This study investigates the interference effects of multiple gases,including CO,SO2,NO,NO2,and CH4,on electrochemical sensors in flue gas analyzers under coexisting conditions.Zero-interference and cross-interference experiments were conducted.Results demonstrated that CO positively interfered with the SO2 sensor,while NO and NO2 negatively interfered with the SO2 sensor,with NO2 causing the most significant interference.An increase of 100mg/m3 in NO2 resulted in a 0.173%reduction in the SO2 sensor reading.NO exhibited significant positive interference with the CO sensor,causing a 0.116%increase in sensor reading per 100mg/m3 increase in NO.Conversely,CH4 negatively interfered with the CO sensor,with each 100mg/m3 increase in CH4 leading to a 0.005%decrease in the CO sensor reading.