Insitu analysis of ammonia slip and water vapor using a tunable diode laser for SCR/SNCR optimization and boiler tube surveillance in power plants

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ABSTRACT

Environmental Regulations driven by the 1990 Clean Air Act require Power Plants to reduce NOx emissions. SCR's and SNCR's reduce NOx emission by injecting ammonia into the combustion flue gas. which ideally reacts with the NOx to form H?0 and Nj. The efficiency of the SCR SNCR is determined by monitoring the outlet for excess NH3. referred to as NH3 slip. The flue gas sample at the measurement point is hot. wet and laden with dust, primarily in Coal Fired Plants (Not usually a problem in Gas Fired Plants). The sample point's harsh physical conditions coupled with the highly reactive nature of NH3 makes reliable extractive low level analysis very difficult. The paper describes an insitu Tunable Diode Laser analyzer for measuring NHs and water vapor in the combustion flue gas just after the SCR in a Power plant. This paper includes performance data generated from the analyzer during a six week test on an actual coal fired Power Plant.1

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