Kjeller dense phase CO2 corrosion project (KDC)
The project started in 2011 and will continue until 2015. The project has included building of a new advanced test rig that is dedicated to study corrosion and solid formation reactions in dense phase CO2 environment. This unique test system includes modules for accurate dosing and analyzing of different impurities which may be present in CO2 captured from power plants.
The test rig enables realistic studies of corrosion and solid formation in dense phase CO2. Impurity control is a challenge in these types of experiments. When the impurities react giving corrosion, solid corrosion products and other type of solids the impurities are consumed and must be replenished. Precise high pressure dosing systems and analytical instrumentation are therefore needed in order to dose and control impurity concentrations in the ppm range.
The Dense Phase Impurity loop with dosing and analyzing modules
In order to predict corrosion and solid formation in CO2 transport it is important to understand and quantify the reactions taking place. It is especially important if a network system is considered in which CO2 with different specifications are mingled. The most likely products of these reactions are regarded to be nitric acid, sulphuric acid and elemental sulphur. Interactions between impurities might lead to the formation of corrosive phases and solids although the water content is far below the solubility limit in pure CO2.
Corrosion of carbon steel in the presence of SO2 or NO2 in a CO2 stream. (Ref.: A. Dugstad, M. Halseid, B. Morland `Effect of SO2 and NO2 on corrosion and solid formation in dense phase CO2 pipelines`, Energy Procedia, 37 (2013) 2877)
The objective of the project is to determine the operation window for safe transport of dense phase CO2 with impurities in carbon steel pipelines and generate a basis for prediction, mitigation and management of corrosion in CO2 transport pipelines.
The knowledge gained will benefit the CCUS industry in design and operation of dense phase CO2 transport pipelines and other facilities that handle CO2 for EOR and sequestration of CO2.
The objective will be achieved through three main research tasks:
- Task 1 will comprise literature reviews and data gathering from external sources, including input from project participants.
- Task 2 will be an experimental activity addressing partitioning of impurities in dense phase CO2. This includes partitioning between gas and dense phase CO2 and between a water containing phase and dense phase CO2.
- Task 3 will comprise corrosion experiments in loops and autoclaves where carbon steel and various types of CRA are exposed to different CO2 blends and various amount of water.
Participants in the project are Shell, Total, Statoil, Gassco and the CLIMIT research programme through Gassnova. The project is still open for more participants.