Chemical Reactions – ANSYS Fluent Training Package

Description

Chemical Reactions CFD Simulation by ANSYS Fluent Training Package, 10 Practical Exercises

This CFD training package is prepared for all users of ANSYS Fluent software at BEGINNER, INTERMEDIATE, and ADVANCED levels, in the Chemical Reactions field, including 10 practical exercises. You will learn and obtain comprehensive training on how to simulate projects. The achieved knowledge will enable you to choose the most appropriate modeling approaches and methods for applications and CFD simulations.

BEGINNER

We start this training package with a sample practical exercise for BEGINNER users, who want to learn the related CFD simulations in the field of CHEMICAL REACTIONS.

Explosion

The explosion and detonation of the oil tank is a major phenomenon that occurs because of specific chemical reactions.

In the present modeling, a sample urban zone is defined as a computational domain in which there are several oil reservoirs and around these reservoirs, there are several residential areas and industrial units. Whereas large chemical reactions occur at the time of an explosion, in which different gaseous species are involved; The model of species transport has been used. Problem 1 simulates the effects of the oil tank detonation process in an urban area and the pollutant emission. In fact, in areas where there are oil reservoirs, one of the potential dangers is an explosion. The explosion of these oil tanks can lead to the release of many pollutants such as carbon dioxide into the environment.

Combustion

One the other practical example of chemical reactions is combustion.

Problem 2 simulates non-premixed combustion. In fact, a two-dimensional combustion chamber is designed in which airflow and fuel flow enter simultaneously from two different inlets with different flow rates. The combustion process occurs when some air is combined with some hydrocarbon fuel to convert fuel energy into heat energy.

Problem 3 simulates the vortex flame inside a combustion chamber. The combustion chamber has a cylindrical structure. The reactants, including fuel flow and airflow, enter the combustion chamber separately from four different inlet sections from the upper part.

In project 4, the steady combustion of methane and air in a combustion chamber considering RADIATION heat transfer is investigated. Radiation heat transfer must be taken into account since combustion chambers undergo extremely high temperatures. In this project, the mixture’s static temperature has a maximum value of 3500 k within the chamber.

Simulation 5 aims to model Simple Premixed Combustion in a POROUS zone and see how the porous zone affects combustion temperature and stabilizes it. This simulation is a matrix-stabilized burner, and the results are compared to the same premixed combustion without porosity. the Species transport model has been used.

INTERMEDIATE

We continue this training package with 2 practical exercises for INTERMEDIATE users related to FLARE, who want to learn the related CFD simulations in the field of CHEMICAL REACTIONS.

Flare

The flare system, also known as a gas flare, is a combustion device used in industrial units such as oil and gas refineries and the production of oil and gas wells, especially in offshore platforms, applying chemical reactions.

Problem 6 simulates combustion in a gas flare system. Gas flares are responsible for burning the natural gases released during oil extraction in a completely controlled manner. During the oil extraction process, some natural gas accumulates on top of the oil in the reservoirs. In general, it is better to try to collect and store natural gas, but if this is not possible, we should burn it.

Problem 7 simulates a two-step mechanism of combustion in a gas flare in the presence of wind flow. The combustion of the mentioned gases using the flare system causes, firstly, prevents the combustion and burning of these gases dangerously and uncontrollably. Secondly, burning and converting methane to carbon dioxide and releasing them in the open space, has less damage than methane release.

ADVANCED

We finish this training package with 3 practical exercises for ADVANCED users, who want to learn the related CFD simulations in the field of CHEMICAL REACTIONS.

Decomposition

Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat.

In study 8, the combination of DPM (discrete particle method) and species transport methods was used to investigate the DECOMPOSITION effect of magnesium oxide particles. The thermodynamic properties of the particles, along with the necessary boundary conditions, were applied in the settings. This reaction is exothermic in the reactor chamber and increases its temperature.

Gasification

The gasification process is a set of chemical reactions in which a carbon-based substance is converted to carbon monoxide, hydrogen, and carbon dioxide.

Problem 9 simulates the Gasification process inside a gasifier chamber.  The product of this process is considered a renewable energy source that has many applications in the industry. In this case, a material is defined as fuel, with a density of 1550 kg.m-3 and a specific heat capacity of 1680 j.kg-1.K-1, which is sprayed into the chamber and reacts with water vapor at high temperature.

Lime Kiln

Lime Kiln CFD simulation is one of the ADVANCED practical exercises in the CHEMICAL REACTIONS field.

Finally, problem 10 simulates the combustion process of methane gas in a vertical lime kiln. The construction of a vertical lime kiln consists of two main parts, including the combustion zone and the preheating zone. The fuel and air enter the building from the middle of the lime kiln and form a combustion reaction.