On using the ANSYS FLUENT software for calculating the process of burning a mixture of particles from different types of solid fuels
DOI:
https://doi.org/10.15587/1729-4061.2020.209762Keywords:
Ansys Fluent, CFD modeling, solid fuel, combustion, blend, bituminous coal, lean coal, anthraciteAbstract
The use of binary mixtures in TPP steam generators as fuels is caused by various reasons, such as improvement of ignition conditions and the possible environmental benefits of burning binary mixtures. Since the existing boilers of TPP were calculated for burning a single type of solid fuel, the relevance of numerical modeling of the combustion processes of binary mixtures is obvious. Among the software widely used to estimate the operation of energy devices is the ANSYS FLUENT program, whose specification does not include the procedure for using it in order to simulate the combustion of solid-fuel mixtures.
To apply the software for this purpose, in the first approach, the mixture of solid fuels is replaced by one fuel with averaged characteristics. Such a model is approximate because it is impossible to reproduce the interaction among the components of the mixture. The second approach makes use of the ANSYS FLUENT software's feature to take into consideration additional (liquid or gas) fuel to replace it by the second solid fuel.
The application of these approaches to the description of the combustion process of anthracite and gas coal mixtures in different ratios and with different particle sizes has shown the proximity of parameters in the furnace. At the same time, the use of a second approach demonstrated the effect exerted by a bituminous coal additive on the fields of anthracite burning intensity, consistent with the known fact of intensification of the combustion process of a less active component of the mixture with the addition of a more active one.
To test the simulation in line with a second approach, the processes in the furnace of the TPP-210A boiler were calculated in three-dimensional approximation when replacing the lean coal with a mixture of bituminous coal and anthracite. The proximity of the resulting parameters is consistent with the known test data and confirms the sufficient correctness of the simulation of the combustion of the mixture of coalsReferences
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