DNV GL launches LNG methane number calculator
The propane knock index (PKI) methane number calculator is intended to reduce the risk of engine damage caused by knocking, when the fuel-air mix inside a cylinder is self-ignited before the combustion process is meant to start.
The calculator is based on an algorithm developed by the class society that DNV GL says has been shown to give a more accurate reflection of the impact of variations in fuel quality than traditional tools. The algorithm can also be incorporated into engine control systems to help eliminate knocking when using a wide range of gas sources.
Liv Hovem, senior vice president, DNV GL Oil & Gas, said: “As LNG is produced at different locations around the world using an assortment of production technologies, its composition can vary considerably. Knowledge of the knock characteristics of LNG fuels is crucial to provide reliable and efficient products and to break down the perceived barriers of adopting LNG.”
Johan Knijp, head of gas quality and energy transition, DNV GL Oil & Gas, added: “Together with an international industrial consortium, the calculator is currently being extended to cover a full range of engines. Market analyses using the tool can be used by the entire supply chain – by engine manufacturers, ship and truck owners, by traders and by international policy makers on LNG.”
Users can determine the knock number by entering LNG composition information including nitrogen, methane, ethane, propane, and n-butane.
The tool can be accessed here (registration required).
