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Tracking down particulates
Date:12/13/2010

p>Working together with the firm Vereta, researchers at the Fraunhofer Institute for Toxicology and Experimental Medicine ITEM in Hannover and the Institute for Mechanical Process Engineering at Clausthal University of Technology have now developed a measuring device that determines levels of fine dust emissions at source. The project was funded by the German Federation of Industrial Research Associations (AiF), and Professor Wolfgang Koch, head of department at the ITEM, explains their achievement: "To date there is no validated method for measuring the dust content in flue gases. The Bosch smoke count method used with oil-fired heating systems is not appropriate, as it looks primarily at soot particles, and soot is not the principal component of emissions from wood-fired combustion. Our device makes it possible to measure particulate concentrations instead. To do this, we simply place a sampling probe developed by us in the stove flue." The probe draws off some of the flue gases, which are diluted with pre-treated air at the tip of the probe and then cooled in a conditioning unit. The conditioned flue gases are subsequently fed through two optoelectronic sensors which use different measuring techniques: the aerosol light-scattering photometry method devised by ITEM, and the aerosol photoemission method developed by Clausthal University of Technology. An algorithm combines the electrical signals from both these sensors to produce a definitive reading.

Professor Alfred Weber of Clausthal University of Technology is proud to report: "We have successfully tested a prototype of the new measuring device. We conducted numerous tests on wood-burning stoves that were being run on a variety of fuels, and were able to prove a linear relationship between the calculated signal received from the device and the mass concentration that was simultaneously measured using a filtering process. This innovative technology provides heating engineers with a cost-effective tool f
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Contact: Wolfgang Koch
wolfgang.koch@item.fraunhofer.de
49-511-535-0117
Fraunhofer-Gesellschaft
Source:Eurekalert  

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