Wednesday, September 18, 2019
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Derek Stuart
Modern coal-fired power plants use a range of methods to reduce the amount of pollution released to the atmosphere. Selective catalytic reduction is used to remove oxides of nitrogen (NOx), high-efficiency electrostatic precipitators remove particulate matter (PM) and wet flue-gas desulfurization (FGD) systems remove sulphur dioxide (SO2). An unfortunate side-effect of using a wet FGD is that the stack gases downstream are saturated with water drops. Consequently, typical instruments used for measuring PM emissions such as opacity monitors and in-situ light-scattering monitors cannot be used because they cannot distinguish between dust particles and water droplets.
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