Contributed by : Dr.S.Madhavan,
Director,Plant Services, Kellogg Brown & Root (KBR), Inc. Houston, TX, USA
Natural Gas business is the hottest area at the moment because of the impetus of the higher prices and because of the fact that it is a very clean fuel.
The LNG business is now booming because of the attractive natural gas prices.As many countries rapidly increase the domestic and industrial consumption of natural gas there is going to be an increasing thirst for LNG especially from India and China among other countries globally.
Dr Madhavan, talked about the status of the LNG industry at the moment, the technology involved, various plants and facilities that need to be developed to make the LNG "chain" possible, the economics of LNG business and the projections for gas and LNG consumption globally.
The presentation was given at the invitation of the Indian Institute of Chemical Engineers to speak in their meeting of the Chennai chapter on 12 December 2005.
Dr.S.Madhavan has done his B.E.(Hons) in Chemical Engineering from Annamalai University and his M.Tech. in Engineering from IIT, Bombay and his Ph.D (With Honors) in Chemical Engineering from Kansas University,USA. He has been with the Engineering & Construction company Kellogg Brown & Root (KBR) for 33 years based in Houston, Texas,USA. His current function is Director of Plant services with global responsibility for commissioning, startup, operations and maintenance of plants and projects contracted by KBR globally
Dr.Madhavan explained how the hydrogen to carbon ratio of the energy fuels was steadily increasing and the different options available for the effective utilisation of gas.These included distribution by pipe lines; liquefaction and re-gasification; compressed gas (CNG); conversion to liquid hydrocarbons; conversion to methanol; conversion to fertilisers; conversion to electric power.
Looking at the economies of different situations, Dr.Madhavan explained that for gas utilisation within a distance of 2,000 km or about, pipeline could prove beneficial; while beyond this distance, transportation either as LNG or in some other converted liquid form or chemicals, could be considered. According to Dr.Madhavan, if flexibility of end-use is also taken into consideration, in addition to other factors, LNG will prove to be the best option.
The `LNG chain,' he noted, refers to the processing of natural gas near the well-head; piping to the liquefaction plant; the liquefaction plant itself; the shipping of LNG; and the receiving and re-gasification terminals in the consuming countries.
Comparative cost of LNG transport vis-a-vis transport through pipelines
[Costs in US$]
Distance in miles 1,000 2,500 3,000 5,000 8,000
Offshore pipe 1.30 4.00 --- --- ----
Onshore pipe 1.00 2.25 2.70 4.45 ---
LNG 2.00 2.25 2.40 2.95 3.60
Dr.Madhavan opined that the process technology is not a major differentiator, as there is very little difference in efficiencies and the overall project costs.However according to him equipment selection - for example between the gas turbine and/or motor drives; spiral wound vs plate-fin exchangers; fit between selected equipment and desired capacity - can make major difference to the project.
According to him, LNG technology is all about executing complex projects in difficult locations.
Dr.Madhavan also explained with illustrations about the difference in the design concepts of 'double containment tanks' and 'full containment tanks' for storage of LNG.He said that taking advantage of the economy of size, LNG train capacities have been steadily increasing over the years.
Presently, investment on an LNG chain of an economic size of around 3.0 -mmtpa could be in the region of $3.0 to 4.0 bn, split approximately as: treatment & liquefaction plant (2 trains) -$1.3 to 1.8 bn; LNG carriers (a battery of six ships of 127,000-cu.m.each) -$1.3 to 1.5 bn; storage and re-gasification facility -$0.4 to 0.6 bn.
Dr Madhavan also threw some light on the LNG consumption pattern world over and some projections about possible future scenario.According to him, global NG consumption, which was in the region of 42-tcf in 1980, is slated to touch a figure of 150-tcf by 2025.
He pointed out that in the USA alone there are nearly 40 LNG receiving terminals operating and proposed to be set up.He pointed out that in the Atlantic Basin, LNG demand could be in the region of 178-million tonnes per annum by 2015, distributed as Continental Europe , North America and UK .
In the Asia-Pacific region, countries like Japan (70-mmtpa), Korea (40), Taiwan (20), China (20) and India (18) are slated to emerge as the large LNG consuming nations by the year 2015.Even as early as 1985.Japan was consuming around 30-million tonnes per annum.As against this, India is now in the process of constructing just two terminals.
This article discusses the following details :
• Gas utilisation
• The LNG Chain
• LNG Process Technology-Key facts
• Typical natural Gas Composition
• Typical LNG Product specification
• LNG Terminal Flow Diagram
• LNG Train Capacities
• Change in LNG Plant Nameplate Capacity
• Main Cost Items for LNG Plant-Distance comparison
• Results of Economic Model
• LNG Contractors for Liquefactino Plants
• Industry LNG Liquefaction Grassroots EPC Awards 1976-2003
• NG/LNG Market Information
• Global Natural Gas Consumption : 1980-2005
• Regional Increases in Natural Gas Consumption – 2002-2025
• World LNG Production to 2015
• LNG Demand
• Significant Demand growth for emerging LNG Markets
• LNG Plants in Qatar
• Natural Gas Production in Qatar
• LNG Output at Bintulu site, Malaysia
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