Loading patent…
AssigneeDr. Foedisch Umweltmesstechnik GmbH
InventorsHolger Foedisch, Petra Schengber, Michael Ulbrich
Estimating the term…
The invention relates to a method and a device for the extractive triboelecric measurement of dust and aerosols. A partial gas stream is removed from the main stream, optionally conditioned and drawn through the triboelectric measuring chamber (5) by suction, with a variable or constant temperature, at a variable or constant speed and with an abradant rotational movement. Sensors (16) are arranged in said measuring chamber (5) in such a way that they are electrically insulated. The triboelectric effect begins when the gas stream that is loaded with dust particles and aerosols passes through the triboelectric measuring chamber (5), preferably in a cyclonic manner, moving rotationally, abradantly on the sensors (16). The triboelectric measuring signals are derived therefrom and supplied for processing. Since gaseous components cannot be measured according to the triboelectric measuring principal, the temperature is controlled intermittently at two temperatures in the chamber. The aerosol concentration is determined from the differences between the triboelectric signal at the low temperature, which is caused by dust and aerosols, and the triboelectric signal at the higher temperature, which is caused by dust alone.
1) Method for the extractive triboelectric measurement of dust and aerosols in streaming gases where a partial stream is branched off from the dust-laden main gas stream, characterized in that said partial gas stream enters through an intake cylinder (19) a tube-shaped triboelectrical measuring chamber (5) equipped with sensors (16), the gas stream is moved across the sensors (16) and thereby causes the dust and aerosol particles contained in the latter being rubbing against said sensors (16), in which a charge exchange is generated, after which the gas stream exits through an outlet piece (22) from the triboelectrical measuring chamber (5).
8) Device for the extractive triboelectric measurement of dust and aerosols in streaming gases, characterized in that sensors (16) are placed inside a tubular triboelectrical measuring chamber (5), where between sensors (16) and the tubular measuring chamber's (5) outer wall (17) there is an insulating layer (18) that—like a concentrically arranged hollow cylinder completely surrounds the sensors (16), and where at the measuring chamber's (15) upper end an intake piece (20) is connected to an intake cylinder (19), whereat at the measuring chamber's (15) lower end an outlet piece (22) is connected to an outlet cylinder (21), and where both the outlet cylinder (21) and the intake cylinder (19) have no electric contact to the sensors (16).
Dependencies are inferred from the claim text.