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عنوان فارسی مقاله:
ارزیابی مدل های ترمودینامیکی برای طراحی، تجزیه و تحلیل و بهینه سازی سیستم های گاز مایع
عنوان انگلیسی مقاله:
Assessment of thermodynamic models for the design, analysis and optimisation of gas liquefaction systems
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Production of liquefied natural gas (LNG) is an energy-intensive process that represents about 4% of the gas energy content. Minimising the energy use of this system has received increasing interest in the design procedure [1,2]. Liquefied natural gas is natural gas that has been converted to liquid form, while compressed natural gas (CNG) is natural gas in a gaseous state and at high pressure. At typical storage conditions (160 C for LNG and 250 bar for CNG), the energy density of LNG is about 22 MJ per litre, which is about 2.4 times greater than that of CNG [3]. The higher heating value of LNG and CNG ranges between 52 and 54 MJ/kg, which is about 3% lower than that of pure methane, but higher than those of crude oil, coal and biomass. These properties make LNG suitable for storage and long-distance transportation, and its use in marine applications seems promising in the future, because of the new limits on nitrogen and sulphur oxides emissions established by the International Marine Organization (IMO) within the Annex VI of the MARPOL treaty [4]. The liquefaction process consists of the following steps. Natural gas is received at ambient temperature and above atmosphericpressure. It is then precooled, condensed and subcooled down to 160 C, and is finally flashed off to the storage conditions. Heat removal in these cryogenic conditions is ensured by refrigeration, which implies the need for input power and heat rejection to the ambient conditions. Natural gas is a mixture containing light- (methane and ethane), medium- (propane and butane) and heavy-weight (pentane and others) hydrocarbons, together with impurities (carbon dioxide, water and nitrogen), which are removed upstream. This mixture is zeotropic: at a constant pressure, it condenses along a temperature glide and the compositions of the two phases in the vapour-liquid region are never the same.
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کلمات کلیدی:
Techno-economic optimisation of three gas liquefaction processes for ... orbit.dtu.dk/.../technoeconomic-optimisation-of-three-gas-liquefaction-processes-for-s... Jun 19, 2016 - Natural gas liquefaction systems are based on refrigeration cycles, which can be subdivided into: the cascade, mixed refrigerant and ... Design and Optimization of Natural Gas Liquefaction ... - ResearchGate https://www.researchgate.net/.../263953748_Design_and_Optimization_of_Natural_G... A natural gas liquefaction and liquid recovery sequence is proposed for top-side offshore floating ..... and to optimize the system in terms of reboiler duty and the. Assessment of thermodynamic models for the design ... - ResearchGate https://www.researchgate.net/.../307877085_Assessment_of_thermodynamic_models_fo... Feb 10, 2017 - Assessment of thermodynamic models for the design, analysis and optimisation of gas liquefaction systems on ResearchGate, the professional ... Optimization of single mixed refrigerant natural gas liquefaction plant ... www.academia.edu/.../Optimization_of_single_mixed_refrigerant_natural_gas_liquef... Optimization of single mixed refrigerant natural gas liquefaction plant with ... The liquefaction of natural gas (NG) in a mixed refrigerant (MR) system is an ... [PDF]Design and Optimisation of Compact Heat Exchangers and Processes ... www.sintef.no/globalassets/project/low...systems/.../sp2_techmeeting7_icae2013.pdf by G Skaugen - Cited by 5 - Related articles ... Heat Exchangers and Processes used for Liquefaction of Natural Gas ... NLPQL by Prof Schittkowski – for the system optimisation problem. 7. Thermophysical ... [PDF]LNG TEALARC REPORT 2.pdf folk.ntnu.no/skoge/diplom/prosjekt09/.../LNG%20TEALARC%20REPORT%202.pdf OPTIMISATION OF TEALARC LNG PLANT by. MBA, EMMANUEL ORJI ... CLASSIFICATION OF NATURAL GAS LIQUEFACTION PROCESSES . ..... refrigeration system, natural gas is cooled down using a cascade of refrigeration cycles. Each.
