Abstract
A dust monitor based on forward light scattering has been developed for continuous measurement of suspended particulates in stack gas. The number and height of the scattered light pulses by small particles corresponds to the number and size of particles, respectively. The following technique has been adopted: a forward light scattering optical system to obtain hign sensitivity, an iso-kinetic sampling probe to keep the velocity of sampled gas the same as the average stream velocity in the stack or the flue, a direct and diluent sampling to attain accurate measurement in a wide range of mass concentrations, and an air-curtain to prevent the contamination of the optical system. The instrument is able to determine mass concentration and particle size distribution simultaneously. The instrument has been used in field tests at oil- and coal-fired power stations, oil-fired industrial boilers, cement kilns and so on, and reproducible and good results have been obtained.
Published Version
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