NEW ESTIMATION METHOD OF PARTICLE-SIZE DI STRIBUTION BY ANISOKINETIC SAMPLING

It is very important to measure particle size distributions in flue ga s. In conventional methods, it is necessary to use a complicated class ifier like the Andersen Stack Sampler or particle size measuring instr uments after an isokinetic sampling in order to get the particle size distribution. On the other hand, the new measurement method utilizes s ampling error due to the anisokinetic sampling as a classification met hod. When the sampling velocity is not equal to the main flow velocity , the ratio of the main flow velocity to the sampling velocity has a l inear relation with the measured concentration and also the ratio of t he measured concentration to the actual concentration. As the slope of this line is determined by the particle size distribution, it is poss ible to estimate the particle size distribution. This method has been experimentally proven for several kinds of particles from 0.5 to 40 mu m in median diameter, and the results are in good agreement with size distributions measured by conventional methods.