Browse Publications Technical Papers 2018-01-1143
2018-04-03

Investigations on the Determination of the Service Methane Number of LNG 2018-01-1143

LNG is a fuel that is under increasing discussion for transport purposes. It differs from CNG because it often has a higher concentration of hydrocarbons > C4. This affects knocking in a negative way. The knocking properties of a gaseous fuel are characterized by the Methane Number (MN) which is defined as the methane content in a mixture of methane and hydrogen which has the same knocking properties as the gas under investigation. It was defined by AVL in the late 1960s. In contrast to the Octane or Cetane Number there is no standardized measurement procedure for the MN, because the equipment AVL used was unique and does not exist anymore. But AVL created a calculation methodology based on the large amount of data they had measured. There are several software implementations of this methodology. Further there are other algorithms which are not based on the AVL data. If an MN is measured on an arbitrary engine the result is called a Service Methane Number (SMN). It usually shows the same tendencies as the MN but different absolute values. For a set of LNGs the SMNs are measured on two single cylinder SI test engines of 200 and 600 cc swept volume. Different approaches to measure the SMN are investigated. Further, several calculation methods are compared with the measurements.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Knock Rating of Gaseous Fuels in the Presence of Diluents

2006-01-3429

View Details

TECHNICAL PAPER

Combustion Characteristics and Generating Efficiency Using Biogas with Added Hydrogen

2013-01-2506

View Details

TECHNICAL PAPER

Combustion Improvement of CNG Engines by Hydrogen Addition

2011-01-1996

View Details

X