Workflow for the S2 example simulation

In this section, we describe the workflow to set up a custom ultimate analysis simulation.

Set up a custom ultimate analysis simulation

1. Copy the UAFuel fluid from the Fluids Library to your simulation-specific Library.

2. Modify the fluid to work with your specific ultimate analysis.

   The fluid needs to contain the following elements for the ultimate analysis reaction set to work:

   

3. Add one source for Air and one for Fuel to your simulation.

   Both sources must use the same fluid. You can change the specified composition accordingly.

4. Add a combustor (Burner model) to your simulation, and then in the Configuration group:

   1. Set the CombModelType paramter to Fluids.UAFuelCombustion.

   2. Set the FuelType parameter to Ultimate Analysis.

   Your simulation is improperly specified (unsquare) until you set these parameters.

   

   Once you set the FuelType parameter to Ultimate Analysis, the Input Data group appears on the Mini Inspector.

5. In the Input Data group, specify the ultimate analysis for your fuel.

   The defaults correspond to the High Volatile Bituminous coal shown in this example.

   

   The input does not need to equal 100 kg. The Burner model normalizes the masses to calculate the composition. However, you can specify the total mass at 100 kg and allow one slack component to fill the composition.

   Once you change the ultimate analysis, an error badge appears on the Burner model.

   

   This happens because the molecular weight of the fuel component in the fluid no longer matches the calculated value from the element weight distribution of the ultimate analysis.

6. Double-click the UAFuel fluid in your simulation-specific Library to open it in the Fluid Editor.

7. In the Component Data section, on the Constants tab, select Basic, and then copy the molecular weight calculated in the Component Data group of the Burner (UA.MW) into the MW column for the Fuel component.

   

8. Select Heat, and then copy the heat of formation value calculated in the Component Data group of the Burner (UA.HF) into the HFORMATION column for the Fuel component.

   

   With these changes, your simulation should be properly specified (square) and solved.

   The stoichiometric coefficients for the combustion reaction automatically adjust to the new ultimate analysis composition, and the mass balance is now correct as well.