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96165 EFFECT OF CHLORINE ON FURNACE WALL CORROSION IN UTILITY BOILERS

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Product Number: 51300-96165-SG
ISBN: 96165 1996 CP
Author: S. C. Kung, P. L. Daniel, R. R. Seeley, S.C. Kung
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The corrosion resistance of several commercial alloys was investigated in laboratory retort tests under a reducing sulfidizing mixed gas at 700 and 900°F (371 and 482°C) for 1000 hours. The test conditions were designed to simulate the corrosion of furnace walls in the combustion zone of utility boilers burning sulfur/chlorine-bearing coal substoichiometrically. Corrosion rates of these alloys were determined and compared to those obtained from a previous study in which the same alloys were evaluated under chlorine-free substoichiometric combustion environments. Results of the two studies reveal that the presence of chlorine in the reducing/sulfidizing mixed gas has a negligible effect on the corrosion behavior of these alloys in this gas at 700°F (371°C), whereas a beneficial effect was observed at 900°F (482°). The beneficial effect implies that the presence of HC1 may impede the sulfidation attack by H2S under certain substoichiometric combustion environments. Keywords: Corrosion, Chlorine, Substoichiometric Combustion, Sulfidation, H2S, Mixed gas.
The corrosion resistance of several commercial alloys was investigated in laboratory retort tests under a reducing sulfidizing mixed gas at 700 and 900°F (371 and 482°C) for 1000 hours. The test conditions were designed to simulate the corrosion of furnace walls in the combustion zone of utility boilers burning sulfur/chlorine-bearing coal substoichiometrically. Corrosion rates of these alloys were determined and compared to those obtained from a previous study in which the same alloys were evaluated under chlorine-free substoichiometric combustion environments. Results of the two studies reveal that the presence of chlorine in the reducing/sulfidizing mixed gas has a negligible effect on the corrosion behavior of these alloys in this gas at 700°F (371°C), whereas a beneficial effect was observed at 900°F (482°). The beneficial effect implies that the presence of HC1 may impede the sulfidation attack by H2S under certain substoichiometric combustion environments. Keywords: Corrosion, Chlorine, Substoichiometric Combustion, Sulfidation, H2S, Mixed gas.
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