对火电厂SCR脱硝系统设置烟气旁路通道的必要性进行了论述，分析了SCR系统设置旁路烟道的经济性、安全性以及可能出现的不利影响。

The necessity of setting bypass in SCR system in thermal power plants was discussed. The system economic and possible adverse influencing of SCR with bypass were analyzed.

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为进一步控制火力发电厂SO2的排放，研究湿法烟气脱硫取消旁路烟道的可行性非常必要，但取消旁路烟道会产生相应一系列问题。

In order to further control the emission of SO2, it is necessary to research the feasibility of canceling bypass gas duct in Wet FGD, which leads to a series of practical problems.

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