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51318-10845-Droplet Corrosion on CO2 Transport Pipeline Steels

Picture for Droplet Corrosion on CO2 Transport Pipeline Steels
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Exposure tests were performed at normal and high pressure where CO2 is supercritical or in dense phase. The focus was set on the corrosion process of condensate as drops on the surface of carbon steels in CO2 with impurities at 278 K

Product Number: 51318-10845-SG
Author: Le Quynh Hoa / Ralph Bäßler / Sandra Knauer / Andreas Kratzig / Dirk Bettge / Axel Kranzmann
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
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In this work, the focus was set on the corrosion process of condensate as drops on the surface of carbon steels (X52, X70), martensitic steel UNS S41500, and superaustenite UNS N08031 in CO2 atmosphere with impurities at 278 K (to simulate the transportation condition in a buried pipeline). Exposure tests were performed at both normal pressure and high pressure where CO2 is supercritical or in dense phase. The drop, 1 ‑ 10 μL in volume, was prepared by dropping CO2 saturated ultra-pure water onto the surface of steel coupons in a one-liter-autoclave. The CO2 gas stream, simulating the oxyfuel flue gas with varying concentration of impurities (SO2 and O2), was then pumped into the autoclave to observe the condensation and corrosion impacts of impurities. Comparable exposure tests were carried out with the same gas mixture and the same volume of water as vapor to observe the drop formation and the corrosion process that follows. The wettability and stability of drops on the surface of steel coupons in CO2 supercritical/dense phase environment was evaluated additionally by contact angle measurement.

Key words: CCUS, supercritical/dense phase CO2, carbon steels, martensitic steel, superaustenite steel, droplet corrosion

 

In this work, the focus was set on the corrosion process of condensate as drops on the surface of carbon steels (X52, X70), martensitic steel UNS S41500, and superaustenite UNS N08031 in CO2 atmosphere with impurities at 278 K (to simulate the transportation condition in a buried pipeline). Exposure tests were performed at both normal pressure and high pressure where CO2 is supercritical or in dense phase. The drop, 1 ‑ 10 μL in volume, was prepared by dropping CO2 saturated ultra-pure water onto the surface of steel coupons in a one-liter-autoclave. The CO2 gas stream, simulating the oxyfuel flue gas with varying concentration of impurities (SO2 and O2), was then pumped into the autoclave to observe the condensation and corrosion impacts of impurities. Comparable exposure tests were carried out with the same gas mixture and the same volume of water as vapor to observe the drop formation and the corrosion process that follows. The wettability and stability of drops on the surface of steel coupons in CO2 supercritical/dense phase environment was evaluated additionally by contact angle measurement.

Key words: CCUS, supercritical/dense phase CO2, carbon steels, martensitic steel, superaustenite steel, droplet corrosion

 

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Corrosion Assessment of Supercritical CO2 Transportation Pipeline Steels

Product Number: 51319-13132-SG
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Publication Date: 2019
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Carbon capture and storage (CCS) is a promising technology that can keep the core value of fossil fuel power plants while significantly reduce CO2 emissions. Pipeline transportation is believed to be the most cost-effective and relatively safe solution in the context of CCS as it can transport large amounts of CO2 under well-controlled environments. However the transported sc-CO2 stream always contains certain amounts of corrosive impurities particularly SO2 and H2S. There is a stress corrosion cracking concern of sc-CO2 pipes because of the presence of high pressure CO2 stream and S-contained agents. Little work has been performed to address this issue. In this paper SCC investigation of pipeline steels in supercritical CO2 stream is conducted and the results are discussed. It is anticipated to support the development of CO2 pipeline standard and advance the deployment of CCS technology in a safe manner.
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