多种气体对烟气分析仪中电化学传感器的交叉干扰研究

Interference Study of Multiple Gases on Electrochemical Sensors in Flue

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、SO_(2)、NO、NO_(2)、CH_(4)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SO_(2)气体传感器呈正方向干扰,NO和NO_(2)气体对SO_(2)气体传感器呈负方向干扰,NO_(2)对其干扰程度最大,每增加100 mg/m^(3)的NO_(2)气体,SO_(2)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/m^(3)的NO气体,CO传感器的示值增大0.116%,CH_(4)气体对CO气体传感器呈负方向干扰,不同浓度梯度的CH_(4)气体对CO气体传感器的干扰相近,每增加100 mg/m^(3)的CH_(4)气体,CO传感器的示值减小0.005%。

This study investigates the interference effects of multiple gases,including CO,SO_(2),NO,NO_(2),and CH_(4),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 SO_(2)sensor,while NO and NO_(2)negatively interfered with the SO_(2)sensor,with NO_(2)causing the most significant interference.An increase of 100mg/m^(3)in NO_(2)resulted in a 0.173%reduction in the SO_(2)sensor reading.NO exhibited significant positive interference with the CO sensor,causing a 0.116%increase in sensor reading per 100mg/m^(3)increase in NO.Conversely,CH_(4) negatively interfered with the CO sensor,with each 100mg/m^(3)increase in CH_(4) leading to a 0.005%decrease in the CO sensor reading.