A monitoring method for sulfate based on ultraviolet absorption spectroscopy dedicated to SO3 monitoring in coal-fired power plants

For understanding the SO 3 emission level in coal-fired power plants to indicate the operating status of the SCR, a sulfate monitoring method based on ultraviolet absorption spectroscopy was proposed to feedback SO 3 concentration. By measuring the absorption spectrum of sulfate, the red shift of the absorption peak was observed when the concentration was higher than 0.01 mol/L. Through optimization, a spectral range for sensitive detection of sulfate was obtained. A quadratic function was given for fitting the relationship between sulfate concentration and ultraviolet absorption. The minimum detection limit of sulfate was determined to be 9 × 10 -5 mol/L.