Onboard Reliquifaction for LNG Ships (eBook)

Published Date

January 2005

Onboard Reliquifaction for LNG Ships (eBook)

$20.04
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This paper describes a BOG re-liquefaction system developed by Tractebel Gas Engineering (TGE) and the operations and economics of implementing the scheme onboard a 200,000 m³ ship(10pp)

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LNG is transported at near atmospheric pressure and low temperatures (approx. –160 °C) over long distances. During the voyage a proportion of the LNG is vaporized by heat ingress in the cargo containment system. The cargo tanks are well insulated with, typically, 270mm cryogenic insulation but some heat inleak producing boil-off gas (BOG) is inevitable. Typical values are about 0.1 to 0.15% of the full contents per day, which over a 21 day voyage, becomes a significant amount.

Ships have employed gas compression and use of the boil-off gas as fuel for the propulsion systems. Until now LNG carriers have been equipped with steam turbines powered by heavy fuel oil (HFO) and/or LNG BOG. However, designers of new larger ships are seeking more economic propulsion solutions.

This paper describes the process concept for a BOG re-liquefaction system developed by Tractebel Gas Engineering (TGE), the operating experience of such a process and preliminary economics of implementing the scheme on board a ship having a capacity greater than 200,000 m³ LNG.

The process described in this paper considers BOG re-liquefaction with a capacity of approximately 6,500 kg/h of BOG, which is sufficient to maintain tank pressure for a carrier of 228,000 m³ capacity. In reality, the boil-off gas rates are somewhat smaller, but the unit must be able to deal with peak rates to bring the tank pressure down and also be able to deal with LNG cargoes having relatively high nitrogen concentrations.

Paper Delivered by:
Dr. K-D.Gerdsmeyer (Tractebel Gas Engineering)
W.H.Isalski (Tractebel Gas Engineering)

Prepared for:
Gastech Bilbao 2005

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

Gastech hosts major IOCs, NOC’s, global utility companies, EPC contractors, shipbuilders, pipeline companies, manufacturers, distributors, technology and service providers, all who play an active role in the global energy value chain.

Title: Onboard Reliquifaction for LNG Ships (eBook)
Product Code: 4433g086
Published Date: January 2005

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