Abstract No.C180102-096

Author name(s): Tao LIU, Meng XI, Zhiyuan WANG

Company: Hudong-Zhonghua Shipbuilding (Group) Co., Ltd., China

Dual-fuel low speed engine is more and more applied in the newly built Liquefied Natural Gas (LNG) carriers. To avoid the potential risks that accompany the use of flammable and explosive gas, the performance of precise safety and reliability assessments is indispensable. This research concerns the simplified engine room of large LNG carriers which is propelled by dual-fuel low speed engine. Possible fuel-gas (natural gas) leakages in different areas are simulated and analyzed. Three representative leakage cases defined by leakage form, leakage location and leak rate are entered into a computational fluid dynamics (CFD) simulation, in which Reynolds stress model of Fluent software is adopted as the turbulent model. The results of leak-gas and flow field velocity distribution are analyzed in combination to obtain the diffusion tendency and the concentration distribution of leak gas in different areas. Based on the analysis results, an optimized arrangement of flammable gas detectors are provided for the engine room, and the adoption of an explosion-proof exhaust-fan is proven to be unnecessary. These analysis methods can be a reference for the similar gas leakage scenarios occurring in confined ventilated spaces. In addition, the simulation results can further be used to quantitatively assess the potential fire or explosion damage in order to guide the design of structure reinforcement.

KEY WORDS: Liquefied Natural Gas (LNG); pipe leakage; Computational Fluid Dynamics (CFD); quantitative risk analysis

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