DYNAMIC SIMULATION: A MAJOR CONTRIBUTOR TO FLNG PROJECT DEVELOPMENT

摘要

The recent development of Floating Liquefied Natural Gas (FLNG) to monetize offshore resources has fostered new design concepts that answer specific constraints such as the impact of wave induced motion and the requirement for compactness. There is a need to innovate selectively, while building on the proven practices of the mature onshore LNG industry. Technip has completed the front end engineering design of several FLNG projects. One of these will be referred to as a perfect example of these new designs as it associates a front end NGL recovery unit comprising a deep LPG extraction with a Dual Mixed Refrigerant liquefaction process. One key engineering activity was to prove that the design is robust in responding smoothly and safely during transient operations and major upsets. This is of prime importance to enable safe, reliable and efficient operation throughout the FLNG lifetime. A detailed and integrated dynamic simulation model was identified as the appropriate tool to study the various transient scenarios. Technip and AspenTech pooled their knowledge and experience to achieve this. This poster will describe how the dynamic model was built, the main constraints and how they were successfully overcome. It will also present the important role of the dynamic simulation study in validating the process arrangement and optimising the control philosophy.