Smoke number

The soot number is used to identify the soot emissions from oil firing systems. It is a key figure for the blackening caused by dust-like emissions contained in the exhaust gas when determining the soot number in accordance with DIN 51 402 Part 1 (October 1986 edition). It thus represents a measure of the soot concentration in the exhaust gas and is determined by sucking a defined partial volume of gas through white filter paper . Taking into account the optical reflectivity of the unoccupied filter paper ( = 0.85 according to DIN), the optical reflectance R of the occupied filter serves as a measured value for the soot number : ${\ displaystyle R_ {g}}$ ${\ displaystyle R_ {z}}$

${\ displaystyle R_ {z} = 10 {(R_ {g} -R) \ over R_ {g}}}$

According to this, a soot concentration of 60 µg / m ³ to 100 µg / m ³ results for a soot number = 1 . ${\ displaystyle R_ {z}}$

An increase in the soot number by 1 corresponds to a decrease in the reflectivity of 10 percent.

According to the technical instructions for keeping the air clean , light oil-fired systems that require approval must not have a smoke number of 1 in Germany. The soot number of oil firing systems that do not require approval is to be determined visually by the chimney sweep on a regular basis in accordance with the measurement procedure regulated in the ordinance on small and medium-sized firing systems; it refers to DIN 51402, which describes the Bacharach method . Systems with evaporation burners must therefore not exceed soot number 2, and soot number 1 is the limit value for those with atomizing burners.

literature

Andreas Schleicher, Wolfgang Hartwig: Comments on the soot number measurement according to Bacharach (DIN 51 402). In: Dust - cleanliness. Air . 50, No. 6, 1990, ISSN 0949-8036 , pp. 235-239.
VDI 2066 sheet 8: 1995-09 measurement of particles; Dust measurement in flowing gases; Measurement of the smoke number in furnaces designed for EL-type fuel oil (Measurement of particles; Dust measurement in flowing gases; Measurement of smoke number in furnaces designed for EL-type fuel oil). Beuth Verlag, Berlin.

Individual evidence

^ ^A ^b ^c Franz Joseph Dreyhaupt (Ed.): VDI-Lexikon Umwelttechnik. VDI-Verlag Düsseldorf, 1994, ISBN 3-18-400891-6 , pp. 1002-1003.
↑ Definition in § 2 no. 15 of the German 1st BImSchV for their purposes, including the relevance of the optical reflectivity and the relation (an increase of 1 corresponds to a 10% decrease in the reflectivity)
↑ Andreas Schleicher, Wolfgang Hartwig: Notes on the soot number measurement according to Bacharach (DIN 51 402). In: Dust - cleanliness. Air . 50, No. 6, 1990, ISSN 0949-8036 , pp. 235-239.
↑ Appendix 2 no. 3.2
↑ § 7 no. 1 for the former, § 8 no. 1 of the 1st BImSchV for the latter type

[q1-1] A ^b ^c Franz Joseph Dreyhaupt (Ed.): VDI-Lexikon Umwelttechnik. VDI-Verlag Düsseldorf, 1994, ISBN 3-18-400891-6 , pp. 1002-1003.

[2] Definition in § 2 no. 15 of the German 1st BImSchV for their purposes, including the relevance of the optical reflectivity and the relation (an increase of 1 corresponds to a 10% decrease in the reflectivity)

[3] Andreas Schleicher, Wolfgang Hartwig: Notes on the soot number measurement according to Bacharach (DIN 51 402). In: Dust - cleanliness. Air . 50, No. 6, 1990, ISSN 0949-8036 , pp. 235-239.

[4] Appendix 2 no. 3.2

[5] § 7 no. 1 for the former, § 8 no. 1 of the 1st BImSchV for the latter type