Results and model validation Sample Clauses

Results and model validation. In this section main results from the mass and energy balances predicted in the SINTEF-ER simulation is compared with the results from the PoliMi and VDZ simulations. In Figure 3.2 the mass flow rates of the main solid components along the cement kiln sections of the three simulations are compared. The overall flow rates are similar for the three simulations. However, the following differences in composition can be observed:  Formation of CA and C2F in the calciner is neglected in the SINTEF-ER and PoliMi simulations, and formation of C2S is neglected in the SINTEF-ER simulation. The SINTEF-ER and PoliMi simulations instead have higher flow rates of CaO, SiO2, and Fe2O3. This affects the overall Cp of the solid stream from the calciner to the kiln.  Clinker is simulated as a user defined nonconventional component (with constant Cp) in the SINTEF-ER simulation while it is modelled as a mixture of the different clinker components in the two other simulations. Attention must be given to the Cp of the clinker component if the temperature of the inlet or outlet clinker is changed in the SINTEF-ER simulation. Molar flow rates of main gas components along the cement kiln sections in the VDZ and SINTEF-ER simulations are presented in Figure 3.3. It can be seen that the flow rates are similar. The maximum absolute difference in the resulting mole fractions is 0.007. The temperature profile in the preheating tower predicted by the three simulations is shown in Figure 3.4. The temperature profiles from the three simulations are in good agreement with each other. Some overall performance parameters are presented for the three simulations in Table 3.2. The parameters for both the SINTEF-ER and PoliMi simulations deviate from the VDZ simulation with maximum 2%.
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