CO2 Flow Loop
The test facility contributes with high quality experimental data used:
- To improve and test basic multiphase flow models for prediction of pressure drop, holdup and flow regimes in pipelines where CO2 unintentionally has entered the vapour-liquid region.
- To study extremely complex behaviours of CO2 mixtures, e.g. transient depressurization.
- To validate simulation of pipe leakages and major pipe ruptures.
- To validate models for CO2 injection in storage reservoir
The test facility can also be used for testing of instruments and components.
The CO2 flow loop is currently equipped with the following instrumentation:
- Narrow beam gamma densitometer for measurement of vapour-liquid phase fractions
- dP-transducers for hydrostatic and frictional pressure drop
- Sapphire sight glass
- High Speed Video camera
- Two Coriolis flow meters, one for the liquid phase and one for the vapour
- Numerous pressure and temperature sensors to monitor the flow conditions
Loop material: AISI 316
Fluids: Pure CO2 and CO2 mixture with e.g. N2, CH4, H2, O2 (minor H2S, SO2 and H2O)
Pressure: Max. 150 bara
Temperature range: -150 to +50°C
Test section: ID 44 mm, L= 13 m
Test pipe incl.: + 7 deg. + vertical
Superficial vapour velocity range: 0 - 10 m/s (55 Am3/h)
Superficial liquid velocity range: 0 - 1 m/s (5 Am3/h)
The CO2 flow loop is a semi-outdoor test rig designed and built to accommodate test campaigns related to long distance pipeline transport of pure CO2 or CO2 mixtures. Such pipelines are normally operated in the liquid or dense phase region. The test facility was built in 2011 in order to acquire experimental data for subsequent testing and validation of the CO2 version of the transient multiphase flow simulator OLGA.
The loop design and performance make this loop a valuable and unique tool for studies of flow phenomena that occur if CO2 rich pipelines should enter the multiphase flow region. The operating window goes from low pressure vapour flow to supercritical flow of CO2 – and all conditions in between.
The flow rig consists of a test section, a return section, a vapour-liquid separator, a liquid pump, a gas booster and various auxiliary components. The flow rig has a combined heating and cooling system and is well insulated. It also has a unique system for pressurization, consisting of a cylinder w/piston operated by a hydraulic aggregate.
Operational control of the loop is through a fully integrated computer system, which also handles the data acquisition.
The picture on the right shows the test section in vertical position.
Snapshot of steady-state vapour-liquid CO2 flow (left) and CO2 transient depressurization (right).
CO2 flow loop. Overview
Main container in the CO2 flow loop
Test section in horizontal position
CO2 flow loop, field test on the dispersion of CO2 from a simulated pipe rupture
2014-10-21 Lan Liu / Morten Langsholt