Wet Combustion Using DPM Combusting Particle

Description

Project Description:(Wet Combustion in a Combustion Chamber Using DPM, Combusting Particle)

In this project, the wet combustion of anthracite volatile in a combustion chamber using combusting particles is simulated. We aim to track fuel particles from the beginning of devolatilization, oxidizing and producing carbon dioxide & water vapor.

It should be mentioned that the liquid fraction of the fuel is 2% and injection lasts for 0.5 seconds. Meanwhile, hot air enters the combustion chamber, increasing the temperature of the particles, causing the volatile fraction to be released.

Methodology of Wet CombustionUsing DPM Combusting Particle:

Species transport and discrete phase model (DPM) have been used to simulate anthracite particles. The combusting particle type is hired with a 2% liquid fraction. The initial temperature of particles is 325K with nonspherical shape and rosin-rammler diameter distribution.

The geometry is designed in ANSYS Desing Modeler software. In addition, an unstructured mesh grid is generated using ANSYS Meshing software. In the next step, they converted to polyhedra cells to reduce computational costs. As a result, 810000 cells were generated.(check figures below)

Results of wet combustion:

As the injection starts in the combustion chamber, the wet part of the anthracite starts evaporating. Although there is enough oxygen in the domain, the reaction doesn`t occur until the volatile fraction is released. The volatile fraction oxides and produces carbon dioxide and water vapor:

1An-vol + 2.207 O₂  ==>  0.1 Co₂ + 4.408 H₂o

The energy released from the reaction increases the chamber temperature up to 2400K. For better illustration, animations are extracted which can be seen below.