|Content Type||Conference Paper|
|Title||Internal Corrosion In Dense Phase CO2 Transport Pipelines - State of the Art And the Need For Further R&D|
|Authors||Arne Dugstad, Institute for Energy Technology; Malgorzata Halseid, Institute for Energy Technology|
|Source||CORROSION 2012, March 11 - 15, 2012 , Salt Lake City, Utah|
|Copyright||2012. NACE International|
|Keywords||CCS, Corrosion, water solubility, CO2, SO2, O2|
There is a strong need to better understand the relation between the water content and the highest acceptable concentration of impurities in the dense phase CO2 to be transported in the Carbon Capture and Storage (CCS) pipelines. At present, there is a lack of data and therefore it is not possible to define the limits for the various impurities when they are mixed. Experiments have shown that corrosion may take place at water concentrations far below the water solubility in the pure water-CO2 system when impurities like SOx, NOx and O2 are present. Particularly large effect and high corrosion rates are observed in the presence of NO2. The paper reviews published work and in-house data on corrosion in dense phase CO2 and discusses possible composition of CO2 stream, its effect on water solubility in the dense phase CO2 as well as how that will influence corrosion of the carbon steel pipeline.
Following the “Blue Map Scenario”1 for the abatement of climate change, about 10 Gtons/year (1012 kg/year) of CO2 need to be safely transported and stored underground in 2050. CO2 has been transported and used in food industry etc. and enhanced oil recovery (EOR) for more than 30 years and large-scale transport of CO2 is therefore not a new technology. More than 5000 km of dense phase CO2 pipelines have been or are in operation. The majority of the pipelines are located in North America where CO2 from mostly natural sources are used for EOR operations through an extensive CO2 pipeline infrastructure.2 Data for most of these pipelines (names, operators, length, diameter, capacity, CO2 sources, etc) can be found elsewhere.2-4 A few of the pipelines only are transporting or have transported anthropogenic CO2. The composition of the CO2 streams are rarely found in the open literature.
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