The main objective of blending LNG is to blend low value “Lean” LNG with high value “Rich” LNG to maximise the sale price and improve the quality of the lower specification product. This is achieved by ensuring that the final product is blended to a target BTU specification, at the lowest possible cost.
Annual payback is in the region of $7M - $17M based on a plant producing 3M tonnes a year.
It is desirable to optimise the energy value of the LNG, ensuring specifications to the various regional areas that exist around the world. The Jiskoot LNG blender ensures that the blended LNG is within specification under all circumstances, whilst minimising the commercial cost.
Feed forward and feedback analysers are used to ensure the Jiskoot LNG blender meets the uncertainty requirements. The analyser system provides maximum flexibility, redundancy and speed of response, with measurement of the blended product BTU being executed by a gas analyser.
Conventional Gas Chromatographs (GC) are too slow for the blending of trim applications and could compromise the accuracy of the final blended product. To improve performance, fast response MicroGC’s are placed on the feed lines to the blender, providing feed forward control of the ratio demand.
Using a Jiskoot LNG blender, short term variance is within better than +/-1% of the target value.