Some practical experience on fine dust emission monitoring. A comparison of results, using different types of equipment.
Different particle sizing sampling equipment is compared. Measurements were carried out with a Johnas, an Andersen cascade impactor and a PM10 separator monted on a Tecora. The results were compared with each other and with the results of dust concentrations measured with a Tecora in accordance with ISO 9096. Measurements were performed at different sources; with different kinds of dust and different concentrations.
Although the amount of data is rather small, at low dust concentrations, an interesting resemblance was found in the particle size distribution between the Johnas and the Andersen. A PM10 separator at the Tecora was malfunctioning at rather high concentrations of sticky dust. Using the results of the dust concentration measurements in accordance with ISO9096, it was found that the dust concentration, measured with the Johnas, decreases with an increasing dust concentration in the stack.
In general, the application of the Johnas for measuring particle size distribution seems to be promising. In contradistinction to other equipment to measure the particle size distribution, the Johnas is easy to operate and can be applied in a wide range of dust sources.