What value does a Wobbe index show?
The Wobbe Index (WI) or Wobbe number is an indicator of the interchangeability of fuel gases such as natural gas, liquefied petroleum gas (LPG), and town gas and is frequently defined in the specifications of gas supply and transport utilities.
What is Wobbe index meter?
The Wobbe Index (WI) expresses the heating value (known as calorific value) of gases used as fuels, taking into account the proportionality of calorific value to the specific gravity, or the density ratio between the given fuel gas and air.
How is the Modified Wobbe index calculated?
The Wobbe index may be defined as Iw = Vc/(Gs)^1/2 where Iw is the Wobbe index, Vc is the HHV value for the fuel and Gs is its specific gravity. Calculate the Wobbe index for a typical fuel. The HHV of natural gas is typically 1,050 Btu / cubic foot and its specific gravity is about 0.59.
How can I reduce my Wobbe index?
To decrease the Wobbe Index of the natural gas, for example, a lower (or preferably zero) Wobbe Index component is added to create a blend. Options for this component include nitrogen (N 2) and carbon dioxide (CO 2). Alternatively, the Wobbe Index of the tail gas could have been increased.
What is Wobbe number of natural gas?
Pure methane has a Wobbe number of 1363; natural gas as piped to homes in the United States typically has a Wobbe number between 1310 and 1390.
What is the difference between calorific value and Wobbe index?
Wobbe index is an indicator of the interchangeability of fuel gases whereas Calorific value is the total amount of heat energy that a unit mass of fuel can produce when we burn it completely. Therefore, this is the key difference between wobbe index and calorific value.
What is the Wobbe number of natural gas?
What is Modified Wobbe index?
The Modified Wobbe Index is a calculated. measurement of volumetric energy content of. fuel and is directly related to the fuel tempera- ture and lower heating value (LHV).
What is 1st and 2nd family gases?
1St: manufactured gas from coal or oil products, generally referred to as ‘Town Gas’ 2nd: Natural Gas. 3rd: LPG.