双通道非分散红外SO2在线检测系统设计

当前烟气检测中对低体积分数的SO₂气体在线检测存在干扰因素多、响应时间慢等问题，针对此情况，利用特定波段红外光可以吸收SO₂的特性，采用单光源双通道方法，设计了基于非分散红外吸收原理的SO2在线检测系统。实验结果显示零点漂移为0.4%，响应时间为3.86 s，线性误差为0.3%，重复性误差为0.52%。参数对比表明，该方法能够准确对SO2体积分数进行测量，更适用于目前烟气在线检测需求。

Design of dual-channel non-dispersive infrared SO2online detection system

The current problems of multiple interference factors and slow response time in online detection of low-volume-fraction SO2 gas in flue gas detection.In this case,an online SO₂ detection system based on the non-dispersive infrared absorption principle was designed,which used the characteristic capability of SO₂ to absorb infrared light in a specific band and adopted a single light source and dual channel method. Experiment results show that the zero drift is 0.4%, the response time is 3.86 s, the linear error is 0.3%, and the repeatability error is 0.52%. A comparison of parameters shows that this method can accurately measure SO2 concentration and is more suitable for the current demand of online flue gas detection.