Sulfuric acid dew point

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The sulfuric acid dew point is comparable to the dew point of water. Sulfuric acid forms as a condensate . The starting medium is usually exhaust gas .

When fuels containing sulfur, such as heating oil and coal, are burned , SO 2 and SO 3 are produced , which react with the water vapor in the exhaust gas to form sulphurous acid and sulfuric acid. The sulfuric acid dew point of heavy oil exhaust gases is 150 ° C.

More generally, we speak of the acid dew point , which refers to all acids in the exhaust gas . The acid dew point of fuels containing sulfur is in the range of 120 to 150 ° C.

The sulfuric acid dew point is important for the design of combustion processes of fossil, sulfur-containing fuels, since the design of the flue gas discharge device ( chimney, etc.) must take into account whether the corresponding dew point temperature should be undercut or not. Falling below this level would mean that highly corrosive sulfuric acid condenses out and attacks the wall, then corrosion-resistant materials such as plastics or low-corrosion, high-alloy steels are required (for example those with the material number 1.4571 (V4A) ).

Web links

Individual evidence

  1. ↑ Recknagel, Sprenger, Schamek: Handbook for Heating + Air Conditioning . Oldenbourg Industrieverlag, Munich 2007, ISBN 3-8356-3104-7 ( limited preview in the Google book search).
  2. ↑ Helmut Effenberger: Steam generation . Springer, Berlin Heidelberg New York 2000, ISBN 3-540-64175-0 ( limited preview in the Google book search).

literature

  • Hermann Rietschel, Horst Esdorn: Room air conditioning : Volume 1: Basics . Springer DE, 1994, ISBN 978-3-540-68938-6 , pp. 406-.
  • KF Knoche, K. Hein, W. Derichs, W. Deutz: On the acid dew point in combustion exhaust gases . In: VGB power plant technology . tape 66 , no. 9 , September 1986, pp. 848-851 .