Calculation of Calorific value of Natural gas (Methane Enrich)

Calculation of Calorific value of Natural gas (Methane Enrich)

Grade:12th pass

1 Answers

Saurabh Kumar
askIITians Faculty 2400 Points
8 years ago
What is Calorific Value?
Calorific Value (CV) is a measure of heating power and is dependent upon the composition of the gas. The CV refers to the amount of energy released when a known volume of gas is completely combusted under specified conditions.
The CV of gas, which is dry, gross and measured at standard conditions of temperature (15oC) and pressure (1013.25 millibars), is usually quoted in Megajoules per cubic metre (MJ/m3).
Gas passing through the National Grid pipeline system has a CV of 37.5 MJ/m3 to 43.0 MJ/m3.

Why is Calorific Value Important?
Knowledge of the CV of natural gas is an essential part of the day to day activities of National Grid as this information is used to determine the amount of energy transported by National Grid. CV information is provided daily to gas shippers and suppliers, which is then used to bill gas consumers. This data is also used by National Grid to determine transportation charges for gas shippers and suppliers.

How is Calorific Value Measured?
The CV of natural gas is measured continually using process gas chromatographs.
Process gas chromatographs separate natural gas into its constituent compounds (i.e. methane, ethane, carbon dioxide, etc.) and measures the amount of each in the gas. The physical characteristics of each component, as defined by ISO 6976, are programmed into the chromatograph and an overall CV is derived from the measured composition.
The determination of the CV of gas is carried out in accordance with international standards and the Gas (Calculation of Thermal Energy) Regulations, as amended in 1997. These regulations stipulate when and where the CV of gas is measured and the type of instrument to be used. The regulations are enforced by Ofgem, who also perform audit checks on the primary data.

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