LNG becomes increasingly viable and popular as a marine fuel. Because LNG is clean burning gas, fewer NOX emissions, and has the lowest emissions level per joule of energy released of all fossil fuels.
The use of LNG on board is attracting to comply with strict emission rules by the International Maritime Organization (IMO).
Fuel gas supply system (FGSS) for LNG fueled ships is a fuel gas handling system, and LNG fuel is delivered to the engine and boiler system for propulsion and power generation of vessels.
This study conducted dynamic simulation using the system of CHEMCAD simulator and DCS, to analyze the control stability of fuel gas supply system (FGSS), when FGSS start-up/shutdown, LNG fuel consumption is changing with engine demand, and gas trip /crash astern etc.
The dynamic process simulations for the above scenario cases were conducted to verify the behavior of controllability of fuel gas supply pressure from FGSS to engine system, and the interactions of BOG compressor control and LNG pump control etc.
Additionally, based on the above study, control parameters were tuned before GAS trial operation (the actual plant commissioning) in advance.
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