Abstract
Errors of anisokinetic sampling in dust concentration measurements were investigated for flue gases from utility boilers in two thermal power plants. The fuels burned in the two power plants are heavy oil and coal respectively. The measurements were carried out in the range of 0.25 < Vo/Vs < 2.0, where Vo is the gas velocity in duct, and Vs is its suction velocity during anisokinetic sampling. Although the errors at the oil combustion plant were negligible since dust particles were very small, the results were seemed to be in agreement with the evaluation equation based on Dp50. However, the errors at the coal combustion plant were significant and in good agreement with the evaluation based on Dp50 and size distribution of particles, Davies Eq. and Belyaev Eq..
