Enhancement of energy performance in a boil-off gas re-liquefaction system of LNG carriers using ejectors

Tan, Hongbo; Zhao, Qingxuan; Sun, Nannan; Li, Yanzhong

doi:10.1016/j.enconman.2016.08.031

Cited by 54 publications

(20 citation statements)

References 29 publications

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“…(1) and Eq. (2), for a standard volume in steady state disregarding potential and kinetic energy can be expressed according to [10] and [11] as…”

Section: Equations For the Mfpt Energy Analysis 21 General Equations For The Turbine Energy Analysismentioning

confidence: 99%

Low Power Steam Turbine Energy Efficiency and Losses During the Developed Power Variation

Mrzljak

2018

Teh. glas. (Online)

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This paper investigates low power marine steam turbine during the variation in its developed power. The turbine is used for the Main Feedwater Pump (MFP) drive. Energy analysis of the Main Feedwater Pump Turbine (MFPT) is based on the measurements performed in nine different operating regimes. The measured operating parameters were steam pressure and temperature at the turbine inlet, steam pressure at the turbine outlet, and a water volume flow through MFP. Turbine energy power losses are most influenced by steam mass flow through the turbine and by steam specific enthalpy at the turbine outlet. An increase in turbine developed power causes a continuous increase in turbine energy efficiency. Analyzed turbine is balanced as most of the other steam system components – maximum energy efficiency will be obtained at the highest load, on which the majority of turbine and system operation can be expected during exploitation.

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“…(1) and Eq. (2), for a standard volume in steady state disregarding potential and kinetic energy can be expressed according to [10] and [11] as…”

Section: Equations For the Mfpt Energy Analysis 21 General Equations For The Turbine Energy Analysismentioning

confidence: 99%

Low Power Steam Turbine Energy Efficiency and Losses During the Developed Power Variation

Mrzljak

2018

Teh. glas. (Online)

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“…(2) Importance of vaporizer: The storage time in an LNG terminal is usually longer than in a CCS terminal due to the longer carrier transport cycle. In this case, the amount of BOG generated in LNG carriers or storage tanks is huge and needs to be re-liquefied at a high cost and requiring considerable amounts of energy [58]. However, the CO 2 carrier transportation cycle and temporary storage period in the terminal are relatively short.…”

Section: Comparison With Lng Terminalmentioning

confidence: 99%

Conceptualization of CO2 Terminal for Offshore CCS Using System Engineering Process

Noh¹,

Kang²,

Huh

et al. 2019

Energies

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In this study, the basic configuration and operation concept of a CO2 terminal were identified by conducting a system engineering process. The performance goal of a CO2 terminal was determined by requirement analysis. Then, functions and timelines were derived by functional analysis to meet the performance goal. Equipment to perform the functions were defined and finally, a process flow block diagram of the CO2 terminal was acquired. The CO2 terminal in this study consisted of three parts. First, the CO2 loading/unloading part is responsible for liquid CO2 unloading from the carrier and loading vapor CO2 onto the carrier. Secondly, the liquid CO2 transmission part extracts liquid CO2 from the storage tanks and increases the pressure until it satisfies the offshore pipeline transportation condition. The vapor-treatment part collects boil-off gas, generates vapor CO2, and charges the storage tanks with vapor CO2 to control the pressure of the storage tanks that discharge liquid CO2. Finally, the study results were compared with a liquefied natural gas (LNG) terminal. The biggest difference between the CO2 terminal in this study and the LNG terminal is that a vaporizer is essential in the CO2 terminal due to the smaller storage capacity of the CO2 terminal and, therefore, the lower amount of boil-off gas.

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“…This analysis is related to energy conservation [24]. For a standard control volume in the steady state, along with disregarding potential and kinetic energy, the mass and energy balance equations are [25][26][27] The marine steam air heater was mounted on steam generator type MB-4E-KS [21,22]. The LNG carrier propulsion plant is equipped with two identical mirror-oriented steam generators.…”

Section: Equations For the Energy And Exergy Analysesmentioning

confidence: 99%

Efficiency and Losses Analysis of Steam Air Heater from Marine Steam Propulsion Plant

2018

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Air heaters are commonly used devices in steam power plants. In base-loaded conventional power plants, air heaters usually use flue gases for air heating. In this paper, the air heater from a marine steam propulsion plant is analyzed, using superheated steam as a heating medium. In a marine propulsion plant, flue gases from steam generator are not hot enough for the air heating process. In a wide range of steam system loads, the analyzed steam air heater has low energy power losses and high energy efficiencies, ranging from 98.41% to 99.90%. Exergy analysis of the steam air heater showed that exergy destruction is quite high, whereas exergy efficiency ranged between 46.34% and 67.14%. Air heater exergy destruction was the highest, whereas exergy efficiency was the lowest at the highest steam system loads, which was an unexpected occurrence because the highest loads can be expected in the majority of marine steam plant operations. The change in the ambient temperature significantly influences steam air heater exergy efficiency. An increase in the ambient temperature of 10 °C reduces analyzed air heater exergy efficiency by 4.5%, or more, on average.

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Enhancement of energy performance in a boil-off gas re-liquefaction system of LNG carriers using ejectors

Cited by 54 publications

References 29 publications

Low Power Steam Turbine Energy Efficiency and Losses During the Developed Power Variation

Low Power Steam Turbine Energy Efficiency and Losses During the Developed Power Variation

Conceptualization of CO2 Terminal for Offshore CCS Using System Engineering Process

Efficiency and Losses Analysis of Steam Air Heater from Marine Steam Propulsion Plant

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