Dual Refrigerant LNG Liquefaction Cycle for Offshore FLNG and Its Pilot Plant
- Hyunki Park (Samsung Heavy Industries) | Minki Kim (Samsung Heavy Industries) | Chulwoo Kim (Samsung Heavy Industries) | Hyobin Kim (Samsung Heavy Industries) | Kihwan Lee (Samsung Heavy Industries) | Mungyu Kim (Samsung Heavy Industries) | Donghun Lee (Samsung Heavy Industries)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 4-7 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2020. Offshore Technology Conference
- Operator Training, Gas Expansion Cycle, Dynamic model/DCS Integration, FLNG, Liquefaction
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The purpose of this paper is to explain the developed dual refrigerant LNG liquefaction cycle for offshore FLNG, the outputs from detailed engineering of its pilot plant, the results of dynamic engineering studies including dynamic simulation with dynamic model/DCS (Distributed Control System) integration, and the current status of its pilot plant.
Compared with the current existing conventional gas expansion cycle, the developed dual refrigerant LNG liquefaction cycle is composed of three different levels of expansion in order to improve the system efficiency which is expressed in terms of kW/(ton/day). There are two stages in the methane (CH4) expansion loop, which are classified warm and cold loop. The warm loop is in charge of the pre-cooling zone and the cold loop is responsible for the main liquefaction zone. The nitrogen (N2) loop is a single stage and is used for sub-cooling of liquefied natural gas. This configuration allows the developed liquefaction cycle to be optimized by closely matching methane (CH4) and nitrogen (N2) warming curve with the natural gas cooling curve. As a result, the thermodynamic inefficiencies are minimized and the power requirements are accordingly reduced when compared to the current existing conventional gas expansion cycle.
Process simulation, which is based on models, is a key activity in process engineering covering the whole life cycle of a process. Therefore, having a good knowledge of the modelling background is compulsory for getting reliable results. Dynamic engineering studies have been carried out in order to achieve the three (3) main objectives (i.e., Process validation, DCS validation, Operator training) because it helps to validate process, establish experts and best practices among operators, enhancing understanding.
The detailed design engineering for 1/42 small scaled pilot plant had been carried out during around one (1) year after completing concept design of the proposed liquefaction cycle. The major outputs from the detailed engineering are HMB (Heat & Material Balance), P&IDs (Piping & Instrumentation Diagrams), 3-D Model, HAZOP (HAZard and Operability) & close-out report, control logics, distributed control system and so on.
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