Design of the compressor-assisted LNG fuel gas supply system

Park, Hyunjun; Lee, Sanghuk; Jeong, Jinyeong; Chang, Daejun

doi:10.1016/j.energy.2018.06.055

Cited by 20 publications

(9 citation statements)

References 15 publications

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“…Liquefied natural gas is stored in a tank to facilitate transportation, and it will be gasified in a heat exchanger when needed. 1 Due to low-freezing point and high specific heat capacity, the propylene glycol-water (PG-W) mixture is a good solution for gasifying liquefied natural gas. 2 The spiral-wound heat exchanger (SWHE) with a great thermal performance per volume is an excellent heat exchanger compared with straight tube heat exchangers because it requires a small area to be installed on ships.…”

Section: Introductionmentioning

confidence: 99%

“…Ships with natural‐gas dual‐fuel engines lead to a reduction of sulfur dioxide. Liquefied natural gas is stored in a tank to facilitate transportation, and it will be gasified in a heat exchanger when needed 1 . Due to low‐freezing point and high specific heat capacity, the propylene glycol–water (PG–W) mixture is a good solution for gasifying liquefied natural gas 2 …”

Section: Introductionmentioning

confidence: 99%

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Investigation on the heat transfer characteristics of propylene glycol–water mixture in the shell side of a spiral‐wound heat exchanger

Jiang

Sun

et al. 2020

Heat Trans

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The heat transfer characteristics of propylene glycol-water (PG-W) mixture (10%, 20%, and 30% propylene glycol) on the shell side of a spiral-wound heat exchanger (SWHE) were investigated experimentally. Among the SWHE selected, there are 18 twined tubes with a diameter of 8 mm. PG-W mixture is on the shell side and water is on the tube side. The results show that the heat transfer coefficient of PG-W mixture flowing downwards is higher than upwards under countercurrent conditions. The heat transfer coefficient decreases with the increasing of concentration of PG-W mixture. When the inclination angle of the SWHE is 90°, the heat transfer coefficient of PG-W mixture is the largest; and when the inclination angle is less than 90°, the heat transfer coefficient decreases with the decrease of inclination angle. The inclination angle has a great effect on the heat transfer coefficient at a high concentration. The fitting correlation equations between Nu, Re, Pr, and inclination angles of SWHE are established.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the heat transfer characteristics of propylene glycol–water mixture in the shell side of a spiral‐wound heat exchanger

Jiang

Sun

et al. 2020

Heat Trans

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“…As for an example, overall compression power reduction and exergy loss analysis for a cascade LNG process presented Nawaz et al [ 22 ] where the authors found possibilities for minimization of the entire process exergy losses. Investigation of the LNG fuel gas supply system, where the compressors are used for various purposes, presented Park et al [ 23 ]. Also in this research, the authors made several variations of the entire LNG fuel gas supply system, but the BOG compressor (or more of them) type is not presented.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Evaluation of a Two-Stage Axial Vapour Compressor on the LNG Carrier

Poljak

Orović

Mrzljak

et al. 2020

Entropy

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Data from a two-stage axial vapor cryogenic compressor on the dual-fuel diesel–electric (DFDE) liquefied natural gas (LNG) carrier were measured and analyzed to investigate compressor energy and exergy efficiency in real exploitation conditions. The running parameters of the two-stage compressor were collected while changing the main propeller shafts rpm. As the compressor supply of vaporized gas to the main engines increases, so does the load and rpm in propulsion electric motors, and vice versa. The results show that when the main engine load varied from 46 to 56 rpm at main propulsion shafts increased mass flow rate of vaporized LNG at a two-stage compressor has an influence on compressor performance. Compressor average energy efficiency is around 50%, while the exergy efficiency of the compressor is significantly lower in all measured ranges and on average is around 34%. The change in the ambient temperature from 0 to 50 °C also influences the compressor’s exergy efficiency. Higher exergy efficiency is achieved at lower ambient temperatures. As temperature increases, overall compressor exergy efficiency decreases by about 7% on average over the whole analyzed range. The proposed new concept of energy-saving and increasing the compressor efficiency based on pre-cooling of the compressor second stage is also analyzed. The temperature at the second stage was varied in the range from 0 to −50 °C, which results in power savings up to 26 kW for optimal running regimes.

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“…Gas supply systems typically include gasifiers, buffer tanks, and accessory pipes. In addition, pumps are required in high-pressure gas supply systems to supply gas to two-stroke dual fuel engines [9]. This paper mainly discusses the low-pressure gas supply system as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Design and Experiment of Low-Pressure Gas Supply System for Dual Fuel Engine

Jiang

Guo

et al. 2020

Polish Maritime Research

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A low-pressure gas supply system for dual fuel engines was designed to transport liquid natural gas from a storage tank to a dual fuel engine and gasify it during transportation. The heat exchange area and pressure drop in the spiral- wound heat exchanger, the volume of the buffer tank and the pressure drop in the pipeline of the gas supply system were calculated by programming using Python. Experiments were carried out during the process of starting and running the dual fuel engine using this gas supply system. Experimental data show that the gas supply system can supply gas stably during the process and ensure the stable operation of the dual fuel engine. The effects of the parameters of natural gas and ethylene glycol solution on the heat exchange area of the spiral-wound heat exchanger and the volume of the buffer tank in the gas supply system were studied. The results show that the heat exchange area calculated according to pure methane can adapt to the case of non-pure methane. The temperature difference between natural gas and ethylene glycol solution should be increased in order to reduce the heat exchange area. The heat exchange area selected according to the high pressure of natural gas can adapt to the low pressure of natural gas. The volume of the buffer tank should be selected according to the situation of the minimum methane content to adapt to the situation of high methane content. The main influencing factor in selecting the volume of the buffer tank is the natural gas flow. The results can provide guidance for the design of the gas supply system for dual fuel engines.

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Design of the compressor-assisted LNG fuel gas supply system

Cited by 20 publications

References 15 publications

Investigation on the heat transfer characteristics of propylene glycol–water mixture in the shell side of a spiral‐wound heat exchanger

Investigation on the heat transfer characteristics of propylene glycol–water mixture in the shell side of a spiral‐wound heat exchanger

Energy and Exergy Evaluation of a Two-Stage Axial Vapour Compressor on the LNG Carrier

Design and Experiment of Low-Pressure Gas Supply System for Dual Fuel Engine

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