Working medium for condensation nuclei counters for exhaust gases of internal combustion engines
A technology of working medium and condensation nuclei, used in instruments, scientific instruments, suspension and porous material analysis, etc.
Inactive Publication Date: 2019-08-02
AVL LIST GMBH
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Problems solved by technology
However, the tetradecane and heptadecane described therein are not suitable as working media for condensation nuclei counters for particle measurement in the exhaust gases of internal combustion engines, since they have a vapor pressure which is at least one order of magnitude lower in the target operating temperature range, Therefore, the atmosphere that is fully saturated or supersaturated with the working medium necessary for the specified function cannot be realized
Although it is technically possible to increase the operating temperature so as to achieve sufficient saturation, this firstly does not comply with the legal and standard regulations for instruments for the measurement of particles in the exhaust gas of internal combustion engines, and secondly the operating temperature requires point range, which means a higher security risk
In addition to this, the alkanes are solid or have insufficiently low viscosity in the operating temperature range of condensation nuclei counters, again making them unusable for the intended application
Method used
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[0014] figure 1 The diagrammatically shows a condensation nuclei counter 1 with a line 2 for the exhaust gas of an internal combustion engine 4 which is taken, for example, from the exhaust pipe of the internal combustion engine 4 . The exhaust gas can also be diluted exhaust gas here. The exhaust gas reaches a temperature-regulated saturation unit 3 preferably temperature-regulated in the operating temperature range from -20° C. to 50° C., said saturation unit 3 comprising, for example, a porous saturation element 5 , from which the liquid working medium 7 from the working medium storage 8 is absorbed Supply to the porous saturation element 5. The exhaust gas flows through the saturation element 5 and is wetted by the working medium 7 there. Via the temperature in the saturation unit 3 and optionally the temperature difference with the cooler condensation unit 6 located downstream, it is possible to adjust the (super)saturation of the working liquid 7 in the exhaust gas and...
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An n-alkane with the general chemical formula CnH2n+2 with an ordinal number n of ten, eleven or twelve is used as operating medium (7) for a condensation nucleus counter for exhaust gases from internal combustion engines (4) by which individual particles contained in the exhaust gas can be counted.
Description
technical field [0001] The invention relates to a working medium for a condensation nuclei counter for exhaust gases of an internal combustion engine and a condensation nuclei counter with a working medium according to the invention. Background technique [0002] The exhaust gases of internal combustion engines contain solid particles in the nm range which are too small to be detected directly optically. However, in order to enable the measurement of said solid particles, so-called condensation nuclei counters are generally used, in which the exhaust gas is passed through a supersaturated atmosphere. The supersaturated atmosphere is produced, for example, by saturating the exhaust gas with vapor of the working medium and then cooling it. The solid particles then act as condensation nuclei on which the supersaturated working medium condenses, which leads to the growth of condensation nuclei. Such condensation nuclei counters are known, for example, from US 4,790,650 A or WO...
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IPC IPC(8): G01N15/02G01N15/06
CPCG01N1/22G01N15/00G01N15/065G01N2015/0046
Inventor M·克拉夫特A·伯格曼
Owner AVL LIST GMBH