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Anisokinetic dust sampling
Šenk, Daniel ; Zlevorová, Tereza (referee) ; Lachman, Jakub (advisor)
The presented thesis deals with the determination of the concentration of dust particles released during the operation of combustion boilers. The accuracy of these measurements can be affected by a number of factors. One of the main factors is the ratio between the gas velocity in the sampling probe and the gas velocity in the pipe. If this ratio is different from 1, we speak of so-called anisokinetic sampling. The CSN standards for the boilers in question prescribe limits for deviations from this value. For automatic biomass boilers, an allowable range is from 0.70 to 1.50. For values within this range, the mass concentrations of dust particles during the combustion of wood and sunflower pellets were determined by manual gravimetric method. The mass concentrations were then converted to relative measurement errors compared to reference values under isokinetic conditions. For the lower limit deviation, a relative measurement error of up to 22.9 % was determined. In the upper range, deviations from the reference values are up to 39.7 %. In this range, an underestimation of the concentration of dust particles occurs; therefore, it would be advisable to consider lowering the upper limit of the permissible isokinetic ratio in the CSN.
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