Week 10 - Simulating Combustion of Natural Gas.
Aim: To perform the Simulating Combustion of Natural gas using Ansys Fluent.
Part I
Perform a combustion simulation on the combustor model and plot the variation of the mass fraction of the different species’ in the simulation using line probes at different locations of the combustor as shown in Fig. You need to plot for CO2, H2O, CH4, N2, O2, NOx emissions & Soot formation.
Geometry:
Meshing:
Setup and Solution:
Residual plot:
Temperature plot:
Nox plot:
Soot plot:
CH4 plot:
CO2 plot:
H2O plot:
N2 plot:
O2 plot:
Part II
As you must have observed from the above simulation, the Nox and soot is getting formed at the outlet of the combustor. Such formation has harmful effects on the environment and humans. The stringent government norms also demand the least formation of Nox and soot and to satisfy those requirements, you need to check the effect of adding the water in the fuel.
In this part, you need to add the water content in the fuel from 5% to 30% by mole and observe the effect of it on the results. It is necessary to provide line plots and contours to prove your claim.
You can use the parametric study approach if required.
Case 1
5% H2O
Residual plot:
Temperature plot:
Nox plot:
Soot plot:
CH4 plot:
CO2 plot:
H2O plot:
N2 plot:
O2 plot:
Case 2
15% H2O
Residual plot:
Temperature plot:
Nox plot:
Soot plot:
CH4 plot:
CO2 plot:
H2O plot:
N2 plot:
O2 plot:
Case 3
30% H2O
Residual plot:
Temperature plot:
Nox plot:
Soot plot:
CH4 plot:
CO2 plot:
H2O plot:
N2 plot:
O2 plot:
Conclusion:
Part 1:
1. In case 1 Combustion Simulation is perform without adding water in this case more pollutant and soot is formed at outlet.
Part 2:
2. In case 2 Combustion Simulation is performed by adding water.
3. In part 2 we perform 3 cases by adding different amount of water percentage i:e 5%,15% and 30% respectively.
4. As the more amount of water is added at fuel inlet there is lag at ignition and it take more time to mix the fuel. So we can say that adding water can reduced pollutant and Soot at outlet.
References
https://www.sciencedirect.com/science/article/pii/S1876610217337724