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51316-7223-Corrosion Assessment of Pipeline Steels in Supercritical Carbon Dioxide Stream

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Carbon Capture and Storage (CCS). The CO2 stream, captured from power plants contains highly corrosive impurities including H2O vapor, oxygen, and hydrogen sulfide. This paper presents our study on corrosion of pipeline steel in sc-CO2 containing H2O, H2S and/or O2 impurities in an autoclave.

Product Number: 51316-7223-SG
ISBN: 7223 2016 CP
Author: Yimin Zeng
Publication Date: 2016
Industry: Energy Generation
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$20.00

Carbon Capture and Storage (CCS) technique is one of the most promising technologies available today that can protect the climate while preserving the value of fossil fuel reserves and existing infrastructure. CO2 Pipeline transportation is a key component in a CCS system. The CO2 stream, captured from power plants, usually contains impurities including H2O vapor, oxygen, and hydrogen sulfide etc., which could lead to extensive corrosion of pipe steels as well as cracking. Available corrosion data on supercritical carbon dioxide (sc-CO2) transportation pipelines are insufficient to determine the acceptable impurity levels for safe operation. Our previous work showed that the presence of H2O in sc-CO2 has only marginal effect on the steel corrosion and the influence of oxygen is coherently related to the pressure of H2O-saturated sc-CO2 stream. Literature review indicates that the influence on corrosion of H2S as an impurity in sc-CO2 is unclear since the related work is sparse and the reported results are somewhat inconsistent. This paper presents our most recent study on corrosion of pipeline steel in sc-CO2 containing H2O, H2S and/or O2 impurities using a rotating cage test method in an autoclave. Generated specimens were characterized by scanning electron microcopy (SEM), energy X-ray dispersive spectroscopy (EDS), focused ion beam (FIB) and transmission electron microscopy (TEM) techniques. The results confirm our previous observation about the effects of H2O and oxygen on corrosion. In H2O-saturated sc-CO2, the corrosion rate is increased with the addition of 50 ppm H2S, but further increase in H2S concentration does not introduce a much higher corrosion rate. A protective iron sulfide layer is formed on the steels when exposed to H2O-saturated sc-CO2 containing H2S. The steels exhibit the highest corrosion rate in H2O-saturated sc-CO2 with oxygen and H2S. Possible corrosion mechanisms in the sc-CO2 media are discussed.

Key words: downloadable, Supercritical carbon dioxide, pipeline steels, H2O, O2 and H2S

Carbon Capture and Storage (CCS) technique is one of the most promising technologies available today that can protect the climate while preserving the value of fossil fuel reserves and existing infrastructure. CO2 Pipeline transportation is a key component in a CCS system. The CO2 stream, captured from power plants, usually contains impurities including H2O vapor, oxygen, and hydrogen sulfide etc., which could lead to extensive corrosion of pipe steels as well as cracking. Available corrosion data on supercritical carbon dioxide (sc-CO2) transportation pipelines are insufficient to determine the acceptable impurity levels for safe operation. Our previous work showed that the presence of H2O in sc-CO2 has only marginal effect on the steel corrosion and the influence of oxygen is coherently related to the pressure of H2O-saturated sc-CO2 stream. Literature review indicates that the influence on corrosion of H2S as an impurity in sc-CO2 is unclear since the related work is sparse and the reported results are somewhat inconsistent. This paper presents our most recent study on corrosion of pipeline steel in sc-CO2 containing H2O, H2S and/or O2 impurities using a rotating cage test method in an autoclave. Generated specimens were characterized by scanning electron microcopy (SEM), energy X-ray dispersive spectroscopy (EDS), focused ion beam (FIB) and transmission electron microscopy (TEM) techniques. The results confirm our previous observation about the effects of H2O and oxygen on corrosion. In H2O-saturated sc-CO2, the corrosion rate is increased with the addition of 50 ppm H2S, but further increase in H2S concentration does not introduce a much higher corrosion rate. A protective iron sulfide layer is formed on the steels when exposed to H2O-saturated sc-CO2 containing H2S. The steels exhibit the highest corrosion rate in H2O-saturated sc-CO2 with oxygen and H2S. Possible corrosion mechanisms in the sc-CO2 media are discussed.

Key words: downloadable, Supercritical carbon dioxide, pipeline steels, H2O, O2 and H2S

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