Search
Filters
Close

98178 Chlorine induced corrosion of steels in fossil fuel power plants

Product Number: 51300-98178-SG
ISBN: 98178 1998 CP
Author: M. Spiegel, H. J. Grabke
$0.00
$20.00
$20.00
The corrosion of steels in power plants (coal combustion, waste incineration) is mainly due to condensed chlorides in the ash deposited on the boiler tubes. These chlorides are stabilized by HCl in the combustion gas. In the case of coal as a fuel, chlorine is present as chloride minerals in the raw material which is converted to HCl during the combustion process. Corrosion of steels in chlorine containing environments occurs by the ‘active oxidation’ mechanism, which is a self - sustaining accelerated oxidation process, catalysed by chlorine. This study shows that solid chlorides react with the oxide scale of the steels to form chlorine, which initiates ‘active oxidation’. In order to prevent chlorine induced corrosion, the deposition of chlorides on the tubes within the coal ash must be avoided. This is possible by the presence of SO2, which is present in the combustion gas, converting the chlorides to sulfates in the gas phase. The paper presents an example of a failure case in a coal fired plant in Germany. In this plant, chlorine induced corrosion was observed after effective removal of SO2 by additions of CaO. From thermodynamic calculations it can be shown that a certain amount of SO2 is necessary in order to avoid deposition of chlorides and to prevent corrosion. Keywords: chlorine induced corrosion, active oxidation, fly ash deposits, solid chlorides, chlorine induced failure case
The corrosion of steels in power plants (coal combustion, waste incineration) is mainly due to condensed chlorides in the ash deposited on the boiler tubes. These chlorides are stabilized by HCl in the combustion gas. In the case of coal as a fuel, chlorine is present as chloride minerals in the raw material which is converted to HCl during the combustion process. Corrosion of steels in chlorine containing environments occurs by the ‘active oxidation’ mechanism, which is a self - sustaining accelerated oxidation process, catalysed by chlorine. This study shows that solid chlorides react with the oxide scale of the steels to form chlorine, which initiates ‘active oxidation’. In order to prevent chlorine induced corrosion, the deposition of chlorides on the tubes within the coal ash must be avoided. This is possible by the presence of SO2, which is present in the combustion gas, converting the chlorides to sulfates in the gas phase. The paper presents an example of a failure case in a coal fired plant in Germany. In this plant, chlorine induced corrosion was observed after effective removal of SO2 by additions of CaO. From thermodynamic calculations it can be shown that a certain amount of SO2 is necessary in order to avoid deposition of chlorides and to prevent corrosion. Keywords: chlorine induced corrosion, active oxidation, fly ash deposits, solid chlorides, chlorine induced failure case
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 99617 POWER PLANT CORROSION
Available for download

99617 POWER PLANT CORROSION

Product Number: 51300-99617-SG
ISBN: 99617 1999 CP
Author: Elliott R. Sampson, Theodore P. Vassallo Jr., Manish Bhusari, Vally McBride
$20.00
Picture for 00250 SUPERHEATER CORROSION IN ULTRA-SUPERCRITICAL
Available for download

00250 SUPERHEATER CORROSION IN ULTRA-SUPERCRITICAL POWER PLANTS

Product Number: 51300-00250-SG
ISBN: 00250 2000 CP
Author: J. L. Blough and G. J. Stanko, W. T. Bakker, John B. Brooks
$20.00
Picture for 98708 EFFECT OF CHLORINE ON COMMON MATERIALS
Available for download

98708 EFFECT OF CHLORINE ON COMMON MATERIALS IN FRESH WATER

Product Number: 51300-98708-SG
ISBN: 98708 1998 CP
Author: Arthur H. Tuthill, Richard E. Avery, Stephen Lamb, Gregory Kobrin
$20.00