LNG Gas Energy Calculation & HIDEAL
The Gas energy calculation is used to calculate the energy of the gas provided by the volume of the gas mixture.
Configure an Attribute with the Gas Meter Heating Calculation (i.e., Attribute i_GHV_Ideal) and then reference it in the Gas Meter Energy Calculation (in the configuration parameter Heating Value).
Inputs
| Input | Description |
|---|---|
| Gas Meter Energy Calculation | |
| Volume | Attribute (in any Volume [standard] UOM) |
| Heating Value | Name of the Attribute from the Gas Meter Heating Calculation (in an Volumetric Energy [standard] UOM) |
| Gas Meter Heating Calculation | |
| Component Mole Fraction | Attribute (DataTable) |
| Heating Value | Column from the Component Table (in any Volumetric Energy UOM) |
Calculations
Example
Using the 'Normalize' option of the component DR, Mole% is automatically converted to Normalized Mole% (N.Mole%):
The N.Mole% is converted to Dry Basis: (For now, assume that LNG DR does not need to do this step.)
Calculate the product of Xind (i_Component_Data_Molar_dry) and Hi (from Component Table):
Component N.Mole% Xin (Wet basis) N.Mole% Xind (Dry basis) Heating Value Hi Xind * Hi Methane (C1) 83.02% 83.02% 1010.00 838.5020 Ethane (C2) 7.45% 7.45% 1769.70 131.8427 Propane (C3) 4.39% 4.39% 2516.10 110.4568 Iso-Butane (iC4) 0.83% 0.83% 3251.90 26.9908 n-Butane (nC4) 1.08% 1.08% 3262.30 35.2328 Iso-Pentane (iC5) 0.31% 0.31% 4000.90 12.4028 n-Pentane (nC5) 0.25% 0.25% 4008.70 10.0218 n-Hexane (C6+) 0.30% 0.30% 4755.90 14.2677 Carbon Dioxide (C02) 2.02% 2.02% 0.00 0.0000 Hydrogen Sulfide (H2S) 0.00% 0.00% 637.10 0.0000 Nitrogen (N2) 0.32% 0.32% 0.00 0.0000 Oxygen (O2) 0.03% 0.03% 0.00 0.0000 Water (H2O) 0.00% 0.00% 50.31 0.0000 TOTAL 1,179.7173 HIDEAL = ∑Hi = 1,179.7173 MMBTU/scf
Volume = 1,339,399 MM scf/day (Given as Input)
Gas Meter Energy (IDEAL) = HIDEAL * Volume = 1,580,112,259 MMBTU