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98180 EFFECT OF SULFUR AND CHLORINE ON FURNACE WALL CORROSION

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Product Number: 51300-98180-SG
ISBN: 98180 1998 CP
Author: S. C. Kung, W. T. Bakker
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The corrosion resistance of a furnace-wall tubing alloy, SA213-T2, was evaluated in a laboratory test, simulating the reducing/sulfidizing combustion environment in PC-fired utility boilers burning coal substoichiometrically. This alloy was exposed to mixed gases containing H2S and HCl, as well as other major flue-gas components, with and without the coverage of ash deposits. The results show that sulfidation was the primary mode of attack on SA213-T2. Chlorination could not be identified from the addition of 80 ppm HCl to the mixed gas and 10 wt.% chlorides to the ash. However, under the lO%-chloride ash, the sultidation attack was noticeably enhanced. The accelerated sulfidation attack was attributed to the increase of point defects in the FeS outer scale formed, thus promoting the outward diffusion of Fe. The presence of a sulfide-rich deposit also considerably increased the sulfidization attack on T2. Such an increase was partially caused by the presence of a constantly reducing/sulfidizing atmosphere locally in the ash layer. In addition, a new corrosion mechanism is proposed here to account for the accelerated attack, which involves sulfidation of T2 by elemental sulfur. The elemental sulfur was formed when the FeS-rich ash was in contact with an oxidizing flue gas. This mechanism would explain the relatively high corrosion wastage found on the furnace walls of units burning coal substoichiometrically. Keywords: FeS, Sulfidation, Chlorine, Furnace Wall, and Corrosion Mechanism
The corrosion resistance of a furnace-wall tubing alloy, SA213-T2, was evaluated in a laboratory test, simulating the reducing/sulfidizing combustion environment in PC-fired utility boilers burning coal substoichiometrically. This alloy was exposed to mixed gases containing H2S and HCl, as well as other major flue-gas components, with and without the coverage of ash deposits. The results show that sulfidation was the primary mode of attack on SA213-T2. Chlorination could not be identified from the addition of 80 ppm HCl to the mixed gas and 10 wt.% chlorides to the ash. However, under the lO%-chloride ash, the sultidation attack was noticeably enhanced. The accelerated sulfidation attack was attributed to the increase of point defects in the FeS outer scale formed, thus promoting the outward diffusion of Fe. The presence of a sulfide-rich deposit also considerably increased the sulfidization attack on T2. Such an increase was partially caused by the presence of a constantly reducing/sulfidizing atmosphere locally in the ash layer. In addition, a new corrosion mechanism is proposed here to account for the accelerated attack, which involves sulfidation of T2 by elemental sulfur. The elemental sulfur was formed when the FeS-rich ash was in contact with an oxidizing flue gas. This mechanism would explain the relatively high corrosion wastage found on the furnace walls of units burning coal substoichiometrically. Keywords: FeS, Sulfidation, Chlorine, Furnace Wall, and Corrosion Mechanism
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