# Combustion Inside the Boiler, Ansys Fluent CFD Simulation Training

114.75

In this project, a combustion inside the boiler has been simulated and the results of this simulation have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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## Combustion Inside the Boiler Project Description

The present simulation is about the combustion inside a boiler via ANSYS Fluent. Boilers are pressurized tanks that carry out the boiling or heating fluid. Boiling is a process that brings the temperature of a fluid to the boiling point. Therefore, the combustion reaction must occur inside these boilers. The combustion reaction occurs in the computational zone of the boiler, and the desired species are defined using the species transport model. Nine different species are defined to define the combustion reaction, and five combustion reactions between these species are defined as volumetric. The current boiler consists of two different inputs, airflow inlet, and fuel flow inlet. Airflow with the temperature of 303.15 K and mass flow rate of 3.375 kg.s-1 enters from the side of the boiler, and a combination of several different fuels with the temperature of 300 K and mass flow rate of 0.6135 kg.s-1 enters from the narrow pipes of the lower part of the boiler.

## Geometry & Mesh

The present model is designed in 3D via SpaceClaim. The boiler is designed so that airflow enters from the side panel of the boiler, and a combination of fuel flows enter through the narrow pipes of the lower part of the boiler, and the boiler outlet is related to the upper pipe of the boiler.

The mesh of the present model has been done via ANSYS Meshing. Mesh is done unstructured, and the number of cells equals 4694637. Figure 2 shows the mesh of the model.

## Set-Up & Solution

Assumptions used in this simulation  :

• Pressure-based solver is used.
• The present simulation is steady.
• The effect of gravity is ignored.

 Models Viscous k-epsilon k-epsilon model realizable near-wall treatment standard wall function Species Model Species Transport number of volumetric species 9 (C4H10, iC4H10, C3H4, C2H4 , Ch4, O2, CO2, H2O, N2) reactions volumetric Energy On Boundary conditions Inlet – Air Mass Flow Inlet mass flow rate 3.375 kg.s-1 temperature 303.15 K O2 mass fraction 0.21 N2 mass fraction 0.79 other species mass fraction 0 Inlet – Pipe Mass Flow Inlet mass flow rate 0.6135 kg.s-1 temperature 300 K CH4 mass fraction 0.704 C3H4 mass fraction 0.074 C2H4 mass fraction 0.035 iC4H10 mass fraction 0.063 C4H10 mass fraction 0.025 other species mass fraction 0 Outlet Pressure Outlet gauge pressure 0 pascal Outer Walls Wall wall motion wall motion heat flux 0 W.m-2 Inner Walls Wall wall motion stationary wall thermal conditions coupled Methods Pressure-Velocity Coupling Coupled pressure second-order momentum second-order upwind turbulent kinetic energy second-order upwind turbulent dissipation rate second-order upwind energy second-order upwind species mass fraction second-order upwind Initialization Initialization methods Standard gauge pressure 0 pascal x-velocity 1.573 m.s-1 y-velocity & z-velocity 0 m.s-1 temperature 303.15 K O2 mass fraction 0.21 other species mass fraction 0

## Combustion Inside the Boiler Results

After solution, 2D and 3D contours related to each defined species’ temperature, velocity, and mass fraction, including oxygen, carbon dioxide, water vapor, CH4, C2H4, C3H4, and C4H10, are obtained. The contours show that after combining carbohydrates with oxygen, a combustion reaction occurs, and, as a result, the boiler interior temperature rises. Also, as the combustion reaction begins, carbohydrates and oxidants decrease at the boiler inlet, and in turn, carbon dioxide and vapor are produced as reaction products, and their amount increases. The results are shown in Figures.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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