BUNKER INDEX :: Price Index, News and Directory Information for the Marine Fuel Industry



« News Home
:: Monthly Archive

News Topics
:: Air Pollution
:: Agreements & M&A's
:: Alternative Fuels
:: BunkerBlog
:: Cargoes & Storage
:: Company News
:: Efficiency, Costs & Charges
:: Environment
:: Events
:: Financial
:: Fuel Quality & Testing
:: Lubes & Additives
:: Oil Spills
:: People
:: Port News
:: Projects
:: Regulation, Legal
:: Services, Products,Technology
:: Statistics & Research
:: Vessels

Regional Archive
:: Americas
:: Asia/Oceania
:: Europe
:: M.East/Africa


BUNKER INDEX :: Price Index, News and Directory Information for the Marine Fuel Industry
Home » News





New tool calculates knock characteristics of pipeline gas supplied

05 Apr 2017 12:22 GMT

Tool is designed to help end users determine the quality of pipeline gas and assess the risk of engine knock.



DNV GL has launced a new online pipeline gas quality calculator, the 'PKI Methane Number Calculator for Pipeline Gas', that it designed to help end users, such as shipping vessels, assess the knock characteristics of the gas supplied.

Dwindling local reserves of natural gas have led to more gas being imported, either by pipeline or by ship as LNG, to meet demand. Since this supply of gas comes from different reserves around the world and is intended for a variety of markets, its composition can vary considerably, and thus imported natural gases generally have a different composition than the gases traditionally distributed.

Furthermore, the drive towards a 'greener' natural gas infrastructure by the steady increase in the introduction of renewable gases into the gas grid adds to the diversity of composition. Hydrogen from power to gas, syngas (hydrogen/carbon monoxide mixtures) from biomass gasification and substantial fractions of carbon dioxide in fermentation gases add fuel components that do not occur in the normal range of natural gas compositions.

Howard Levinsky, Senior Principal Specialist, DNV GL - Oil & Gas, explained: "Different gas compositions have different combustion properties, which can adversely affect the performance of end-use equipment, such as gas engines. The key question decision makers in the gas industry and engine manufacturers need to address is whether the combustion properties of a 'new' gas composition differ from the equipment's specification to the extent that the fitness for purpose and safety for the end-user are at risk. When assessing the potential impact of introducing new fuels into the natural gas infrastructure, it is essential that the risk of causing knock in the population of end-use equipment can be assessed quantitatively."

How it works

To assess the fitness for purpose of new gaseous fuels, DNV GL has developed an algorithm that quantifies the effect of the pipeline gas quality on engine knock and is designed to help ensure safe and efficient engine operations.

According to DNV GL, a comparison with experiments using a lean-burn engine in a configuration for combined heat and power (CHP) shows that the algorithm gives a significantly more accurate reflection of the impact of variations in fuel quality on engine knock than traditional tools.

Similar to DNV GL's PKI Methane Number Calculator for LNG, the new PKI Methane Number Calculator for Pipeline Gas computes a PKI Methane Number to quantify the fuel's so-called knock resistance on a 0-100 scale analogous to the octane number for gasoline.

DNV GL claims the new PKI Methane Number Calculator for Pipeline Gas stands out from traditional methods in terms of its accuracy in assessing the impact of butanes, pentanes and their isomers, substantial amounts of nitrogen and carbon dioxide, and the components from renewable gases that do not occur in natural gas, such as hydrogen and carbon monoxide.

A comparison with experiments using a lean-burn engine in a configuration for combined heat and power (CHP) is said to show that the algorithm gives a significantly more accurate reflection of the impact of variations in fuel quality on engine knock than traditional tools.

According to DNV GL, the research method used to derive the PKI Methane Number Calculator for Pipeline Gas offers a flexibility that traditional tools do not have. Adapting the calculator for different engine platforms and different fuels is said to be straightforward. For instance, together with key industry partners, DNV GL is currently applying the method to different engine platforms that use LNG as a fuel (marine, truck and CHP engines).

The computational algorithm behind the tool is described as being easy to use. DNV GL says the equation used to calculate the methane number can be readily incorporated into engine-control systems to maximize knock-free performance when using a wide range of fuels.

Elisabeth Torstad, CEO, DNV GL - Oil & Gas, remarked: "Using the online pipeline gas calculator, fuel suppliers, engine manufacturers, gas network operators and end-users can quickly assess the risk to gas engines of changing fuel compositions. By developing this tool, we are helping to ensure a gas-supply transition to a more sustainable future."

Image: Howard Levinsky, Senior Principal Specialist, DNV GL - Oil & Gas




Related Links:

New tool calculates the effect of LNG quality on engine knock

Latest News:

Another first for Wartsila as wireless charging for hybrid coastal ferry is 'successfully' tested
Scandlines hails bunker-saving summer for hybrid ferries
BHP, GoodFuels to collaborate on biofuel bunker project in Singapore
The OPEC / non-OPEC meeting takes centre stage
Oil and fuel oil hedging market update
Fluxys focuses investment on Zeebrugge's fifth LNG tank and second jetty
Rolls-Royce and Inmarsat sign ship energy management agreement
Bullish market sentiment remains, short-term dark horse could be meeting comments
Oil and fuel oil hedging market update
Dorian LPG and ABS to conduct feasibility study of LPG as marine fuel
CO2 reduction addressed at ECSA seminar
World's first dual-fuel boxship conversion completed




Page Links:

Prices
Africa
Asia
Latin America
Middle East
North America
North Europe
South Europe
Index Summary
Price Highlights
Commentaries
Futures
Prices
Antwerp
Busan
Cape Town
Fujairah
Houston
Istanbul
Kaohsiung
Las Palmas
Maracaibo
New Orleans
Piraeus
Rio de Janeiro
Rotterdam
Santos
Singapore
Directory
Africa
Asia
Central America
Middle East
North America
North Europe
Oceania
South America
South Europe
Directory
Germany
Gibraltar
Greece
Hong Kong
Italy
Japan
Netherlands
Panama
Russia
Singapore
South Africa
South Korea
Spain
Turkey
United Arab Emirates
United Kingdom
United States
News
Latest News
Blogs
Archive
Americas
Asia
Europe
Middle East
News
Air Pollution
Agreements & M&A's
Alternative Fuels
Cargoes & Storage
Efficiency, Costs & Charges
Environment
Events
Financial
Fuel Quality
Lubes & Additives
Oil Spills
People
Port News
Projects
Regulation/Legal
Services, Products, Technology
Statistics & Research
Vessels
Events
Upcoming Events