LNG: truck loading
The use of LNG as fuel is a key component of the decarbonisation efforts worldwide. LNG composition at truck loading facilities has been traditionally measured using a gas chromatograph (GC).
Prior to injection into the GC for analysis, a representative sample of the LNG must be brought from its cryogenic liquid state to a room temperature gas using a vaporisation process. Poor vaporisation, usually due to partial and pre-vaporisation of the LNG sample, is the dominant source of uncertainty in the measurement of LNG composition. Vaporisation systems are sensitive to LNG flow rates, so any changes in stable flow during transfer may result in inaccurate energy calculations.
By eliminating the vaporisation step, a Raman measurement of the LNG in the cryogenic liquid state results in a significant improvement in efficiency and in the quality of the LNG. The Raman Rxn4 analyser for LNG with the Rxn-41 probe for cryogenic service provides accurate measurement of the composition and calorific value of LNG, with up to a 10 times lower uncertainty than GC-vaporiser system.
Read the full white paper to learn all the benefits of the Raman Rxn4 analyser.