Liquefied natural gas

Liquefied natural gas
Name	Liquefied natural gas
Other names	LNG
Composition	Methane, ethane, propane, butane, nitrogen
Phase	Cryogenic liquid
Boiling point	−162 °C (−260 °F)
Density	~0.45–0.5 g/cm³
Uses	Power generation, industrial feedstock, marine bunkering
First cold	1910s
Commercialization	1964 (Arzew)

Liquefied natural gas is natural gas predominantly composed of Methane that has been cooled to a cryogenic liquid for ease of storage and transport. It is central to modern energy security strategies and links producers such as QatarEnergy, Gazprom, and Chevron with consumers in markets like Japan, South Korea, and United Kingdom. The technology underpins international projects including the Yamal LNG development and terminals such as Sabine Pass Liquefaction and Daesan LNG Terminal.

Overview

LNG is produced by condensing Methane and associated light hydrocarbons into a liquid at about −162 °C, reducing volume by roughly 600:1 to facilitate long-distance movement by sea and land. Major producing regions include the Middle East, North America, Russia, and Australia, while major importing regions include East Asia, Europe, and South America. Large-scale projects often involve multinational consortia of firms like Shell plc, TotalEnergies, ExxonMobil, Eni, and state-owned companies such as Petrobras and National Iranian Oil Company; finance commonly involves export credit agencies including the Export–Import Bank of the United States and multilateral institutions such as the World Bank.

Production and Liquefaction

Gas is extracted from conventional and unconventional reservoirs operated by companies like BP and ConocoPhillips and processed at surface plants such as LNG Train complexes to remove impurities and heavier hydrocarbons. Feedgas processing steps employ equipment by manufacturers such as Air Products and Chemicals, Siemens Energy, and General Electric. Liquefaction cycles commonly utilize refrigeration technologies: the Claude process, Mixed refrigerant process, and cascade cycles using refrigerants like propane and ethylene; licensors include Air Liquide, Linde plc, and MHI (Mitsubishi Heavy Industries). Notable greenfield projects have included North West Shelf Venture, Prelude FLNG, and Yamal LNG, while brownfield expansions have been implemented at sites such as Gorgon, Karratha, and Idku.

Transport and Storage

Cryogenic storage and maritime transport are dominated by specialized vessels—moss-type, membrane-type, and SPB ships—constructed by yards including Daewoo Shipbuilding & Marine Engineering, Hyundai Heavy Industries, and Samsung Heavy Industries. Major LNG carriers such as those serving the QatarGas fleet and operators like Mitsui O.S.K. Lines and NYK Line shuttle between liquefaction plants and regasification terminals. Onshore storage uses full containment tanks designed by firms such as Chicago Bridge & Iron; floating storage and regasification units (FSRUs) provide faster market access and have been deployed in countries like Portugal, Greece, and Argentina. Bunkering infrastructure has been developed to serve Maersk Line, CMA CGM, and other shipowners transitioning to low-emission fuels.

Regasification and Distribution

Regasification terminals return LNG to gaseous form using seawater heaters, ambient air vaporizers, or submerged combustion vaporizers; operators include terminal owners such as Terminal de Regasificación de GNL de Pisco partners and utilities like Enel and EDF. Once vaporized, gas enters transmission networks managed by transmission system operators like National Grid (UK), Gaz-System, and Enagas for onward delivery to power plants, petrochemical complexes, and citygate customers. Small-scale regasification and virtual pipeline services have been promoted by firms such as Chart Industries and Kineticorp to serve remote industrial sites and island markets including Canary Islands and Hawaii.

Safety and Environmental Impacts

Safety regimes for LNG operations are regulated by agencies and standards bodies including the International Maritime Organization, American Petroleum Institute, and International Organization for Standardization. Key hazards include cryogenic burns, flammable vapor clouds, and pool fires; risk assessments reference incidents such as the Skikda LNG accident and lessons from industrial safety frameworks like Process Safety Management standards. Environmental impacts arise from methane slip across the supply chain, lifecycle greenhouse gas emissions compared with alternatives such as Coal and Liquefied Petroleum Gas, and localized ecological effects from regasification discharges; mitigation measures are promoted by organizations such as the International Energy Agency and UNFCCC initiatives. Technologies to reduce emissions include methane detection systems by Picarro, electrified liquefaction, carbon capture and storage projects supported by IEAGHG, and fuel switching programs incentivized under policies like European Green Deal.

Economics and Global Trade

LNG trade has evolved from long-term oil-indexed contracts to more flexible mechanisms including spot markets, hub-based pricing at nodes such as TTF (Title Transfer Facility), Henry Hub, and trading on exchanges like ICE and CME Group. Market participants include traders and utilities such as Trafigura, Vitol, Shell Trading, and national buyers like KOGAS and Tokyo Gas. Financial structures combine project finance, equity stakes by sovereign wealth funds like Qatar Investment Authority, and offtake agreements with counterparties including Iberdrola; geopolitical events such as the 2022 Russian invasion of Ukraine reshaped European sourcing strategies and accelerated FSRU deployments in states like Poland and Lithuania. Cost drivers include liquefaction tolling, shipping freight charters, boil-off gas management, and regasification fees; market analytics are provided by consultancies such as Wood Mackenzie and Rystad Energy.

Category:Energy