• Title/Summary/Keyword: liquefied natural gas

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Analysis of Combustion Flow of LNG-Fueled Gas Turbine Swirl Burner (LNG 연료를 이용한 가스 터빈 연소기의 연소유동 해석)

  • Kim, Tae-Ho;Kang, Ki-Ha;Choi, Jeong-Yeol;Kim, Sung-Chul
    • Journal of the Korean Society of Combustion
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    • v.13 no.3
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    • pp.33-40
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    • 2008
  • Two- and Three- dimensional numerical simulations are carried out to understand the combustion characteristics of LNG-fueled gas turbine combustor for power generation using imported and domestic natural gases. Reacting flow characteristics of the swirl stabilized natural gas combustor were understood from the numerical results with the flow conditions selected from the gas turbine operation data. The thermal influences of different natural gases were very small and the fuel composition and flow rate were considered to be tuned well. The flow structures of the recirculation and combustion region was understood from the comparison of the two- and three-dimensional results. The complexity of the three-dimensional swirl flows inside the gas turbine combustor with multiple swirlers was understood those resulting from the interactions of the stage and pilot burners.

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Estimation of the Ammonia Refrigeration Cycle Using LNG Cold Heat (액화천연가스 냉열을 활용한 암모니아 냉동 사이클의 추산)

  • NOH, SANGGYUN
    • Transactions of the Korean hydrogen and new energy society
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    • v.29 no.4
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    • pp.357-362
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    • 2018
  • In this study, computer simulation and optimization works have been performed for a refrigeration cycle using ammonia as a refrigerant and also how much power was saved when the liquefied natural gas cold heat is replaced for the refrigeration cycle. PRO/II with PROVISION release 10.0 from Schneider electric company was used, and Peng-Robinson equation of the state model was selected for the modeling of the refrigeration cycle and LNG cold heat utilization process.

Electric power system design and analysis for FLNG vessel

  • Lee, Geunbo;Jang, Jaehyeoung;Lyu, Sungkak;Yu, Jinyeol
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.5
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    • pp.573-580
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    • 2014
  • The electrical reliability of the power generation and distribution system of Floating Liquefied Natural Gas vessels has been analyzed according to the operating modes using Electrical Transient Analysis Program in this paper. Electricity is used for the topside processes, cargo pumps for off-loading, thrusters for heading control and marine equipment. It is very important to improve the safety, efficiency, and stability of the electrical power system for successful operation. The voltage variation of the high and the low voltage bus shall be within the primitive limitation range at normal operation loads both in steady state and in the transient state. The power system was simulated and compared with class rule for design verification.

Thermodynamic Analysis of Power Generation Cycle Utilizing LNG Cold Energy (LNG 냉열을 이용하는 동력사이클 열역학 해석)

  • 최권일;장홍일
    • Progress in Superconductivity and Cryogenics
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    • v.1 no.1
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    • pp.48-55
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    • 1999
  • thermodynamic cycle analysis has been performed for the power generation systems to utilize the cold energy of liquefied natural gas (LNG). The power cycle used the air or water at room temperature as a heat source and the LNG at cryogenic temperature as a heat sink. Among manypossible configurations of the cycle. the open Rankine cycle. and the closed Brayton cycle, and the closed Rankine cycle are selected for the basic analysis because of their practical importance. The power output per unit mass of LNG has been analytically calculated for various design parameters such as the pressure ratio. the mass flow rate. the adiabatic efficiency. the heat exchanger effectiveness. or the working fluid. The optimal conditions for the parameters are presented to maximize the power output and the design considerations are discussed. It is concluded that the open Rankine cycle is the most recormmendable both in thermodynamic efficency and in practice.

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A Study on the Price Evaluation Per 1 Ton of Liquefied Natural Gas According to the Refrigerants Supply Temperature in the Electric Refrigerator (전기식 냉동기에서 냉매의 공급온도에 따른 액화천연가스의 톤당 냉열 가격 산출에 대한 연구)

  • KIM, YONUNGWOO;PARK, ILSOO;CHO, JUNGHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.5
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    • pp.473-477
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    • 2019
  • In this paper, cold heat price contained in the 1 ton/h of LNG has been evaluated using PRO/II with PROVISION release 10.2 from Aveva company when LNG is used to liquefy several refrigerants instead of using vapor recompression refrigeration cycle. Normal butane, R134a, NH3, R22, propane and propylene refrigerants were selected for the modeling of refrigeration cycle. It was concluded that LNG cold heat price was inversely proportional to the refrigerant supply temperature, even though LNG supply flow rate is not varied according to the refrigerant supply temperature.

Overall Study for the Import Storage and Usage of the Liquefied Natural Gas (L.N.G) (No.3 the Origin and physical property and gas field formation of the natural gas) (액화천연가스의 수입저장이용에 관한 종합적 조사연구 (그의3 천연가스의 생성 물성 및 산출상태에 관하여))

  • 나윤호
    • Journal of the Korean Professional Engineers Association
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    • v.12 no.4
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    • pp.26-31
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    • 1979
  • The Natural Gas and petroleum have the same Origin, Namely, Ocean bottom deposits of the marine plant, plankton which are subdued to the biological action of the bacterium under the anaerobic circumstance, and changed to the hydrocarbon gas and oils. and such resources are appeared in the aqueous sedimentary rocks in the tertiary. There are three types of gas field, which are oil well gas field, structural gas field and water soluble gas field.

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A Study of Thermo-Mechanical Analysis for the Design of High Pressure Piping System for Natural Gas Fuel Vessel (천연가스 연료선박의 고압 이중 배관 설계를 위한 열-구조 해석에 관한 연구)

  • Park, Seong-Bo;Sim, Myung-Ji;Kim, Myung-Soo;Kim, Jeong-Hyeon;Lee, Jae-Myung
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.4
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    • pp.425-431
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    • 2015
  • LNG (liquefied natural gas) is considered the best alternative eco-fuel, and many studies on the LNG fuel system have been performed to use LNG as the fuel for ships. For the LNG fuel supply system, natural gas transfers from the vaporizer to the engine in the gaseous state with a temperature of $50^{\circ}C$ and a pressure of 35MPa. Therefore, a structural safety evaluation of the double-walled pipelines considering thermal load is essential. In this article, an uniaxial tensile test for super duplex stainless steel, material for double-walled pipe, according to the annealing time was carried out to analyze the thermal effect. In addition, thermo-structural analysis of the high temperature-high pressure double-walled pipe with fixed supports that are now used widely was carried out to evaluate the structural safety. To minimize stress concentration of the connection point between the support and inner pipe, the shapes of the new type support that can slip through inner pipe were proposed, and the supports which has best structural performance was selected using the results from the thermo-structural analyses of new supports and an analysis of the whole double-walled pipeline was performed to ensure structural safety. These results can be used as a database for the design of double-walled pipelines and sliding support.

A Study on Swaging Characteristics of Band for Low Pressure Hose (저압 호스용 밴드의 체결특성에 관한 연구)

  • Kim Tyoung-Gyu;Kim Pil-Jong;Cho Seok-Beom;Kwon Boo-Kil
    • Journal of the Korean Institute of Gas
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    • v.9 no.3 s.28
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    • pp.32-37
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    • 2005
  • Hose bands, which are used in LPG (Liquefied Petroleum Gas) or LNG (Liquefied Natural Gas) facilities for home use to join low pressure hoses with fuse-cocks (or regulators), should give a tight connection to prevent a gas leakage from hose connection parts. In this paper, hydraulic pressure tests and pull force tests were carried out to evaluate the performance and swaging length of hose bands. Experimental results showed that the swaging force of ear type bands were higher than those of spring bands and also showed that the optimal swaging length was about 1${\~}$2 mm from the hose end.

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A Study on the Inner tank Seismic Analysis Model for Calculation of Seismic Forces of LNG Storage Tank (LNG저장탱크 지진력 산정을 위한 내부탱크 지진해석 모델에 관한 연구)

  • Kim, Miseung;Lee, Kangwon;Kim, Junhwi;Yoon, Ihnsoo
    • Journal of the Korean Institute of Gas
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    • v.17 no.5
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    • pp.58-63
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    • 2013
  • LNG(Liquefied Natural Gas) has been considered as the green energy. Thus, the demand of natural gas is keep increasing around the world, and various studies are actively under progress about the LNG storage tank. To calculate the seismic forces of actual LNG storage tank, FEM model has to include inner tank, outer tank, pile and soil to implement the interaction between structure and ground. So, this paper is represent the study about inner tank model of three cases using Malhotra method in EN 1998-4(European Standard). The results of calculation were compared, and the most suitable to inner tank model was suggested.