Analysis of Internal Gas Leaks in an MCFC System Package for an LNG-Fueled Ship

Gilltae Roh,Hansung Kim,Jun-Young Park,Youngseung Na

doi:10.3390/app9112330

Gilltae Roh, Hansung Kim + Show 2 more

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https://doi.org/10.3390/app9112330

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Abstract

The airflow inside the housing of a 300-kW molten carbonate fuel cell (MCFC) system is designed to ensure safety in case of a gas leak by applying computational fluid dynamics (CFD) techniques. In particular, gas accumulating zones are identified to prevent damage to vulnerable components from high temperature and pressure. Furthermore, the location of the alarm unit with the gas-leak detector is recommended for construction of safe MCFC ships. In order to achieve this, a flow-tracking and contour field (for gas, temperature, and pressure) including a fuel-cell stack module, balance-of-plant, and various pipes is developed. With the simulated flow field, temperature flow is interpreted for the heating conditions of each component or pipe in order to find out where the temperature is concentrated inside the fuel cell system, as well as the increase in temperature at the exit. In addition, the gas leakage from the valves is investigated by using a flow simulation to analyze the gas and pressure distribution inside the fuel cell system.

Highlights

The policies for marine environmental regulations of the International Maritime Organization (IMO) and governments have recently been strengthened to reduce air contaminants and greenhouse gases, including nitrogen oxides (NOx ), sulfuric oxides (SOx ), and carbon dioxide (CO2 )
Pr fraction of 2% covered around one quarter of the BOP chamber, which should be ventilated by carrier t gas from The the louver right-hand side
Figure 10fluid shows the vertical of pressure distribution inside the package

Summary

Introduction

The policies for marine environmental regulations of the International Maritime Organization (IMO) and governments have recently been strengthened to reduce air contaminants and greenhouse gases, including nitrogen oxides (NOx ), sulfuric oxides (SOx ), and carbon dioxide (CO2 ). Marine engineers have considered various strategies for building green ships such as developing a highly efficient propeller, modification of fan shapes, and optimization of an operational window [1,2,3]. In 2016, the IMO Marine Environment Protection Committee (MEPC) restricted the emissions of SOx from 3.5% to 0.5% for marine ships in the entire ocean until 2020 [4]. Many shipping firms are adopting liquefied natural gas (LNG) as marine fuel in an attempt to replace conventionally used heavy fuel oil (HFO). The use of LNG in ships is considered to be a way to safely use boil-off gas (BOG) that is naturally generated by heat leaks. The ultimate goal of shipbuilders is to replace diesel engines, which emit greenhouse gases, with regenerative energy generators (zero-emission ships)

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