THERMAL SCIENCE

International Scientific Journal

Nikola V. Karličić

,

Milan M. Petrović

,

Dejan B. Radić

VALIDATION OF NUMERICAL MODELS FOR PREDICTION OF PRESSURE DROP IN HIGH CAPACITY LONG DISTANCE LIGNITE FLY ASH PNEUMATIC CONVEYING

ABSTRACT
This paper will validate two basic concepts of numerical models for prediction of pressure change along the transport pipeline in the case of long distance and high capacity lignite ash pneumatic conveying. Application of various friction factor correlations and variation of given parameter, led to the total of fourteen different numerical models and program codes in FORTRAN. The input data for numerical models are based on comprehensive experimental research of high capacity and long distance Kolubara lignite fly ash pneumatic conveying system within 620 MWe thermal power plant unit under operating conditions. Numerical simulation results are validated against experimental data and subjected to statistical analysis methods. The functional dependence obtained by the least squares method was evaluated using mean squared deviation and correlation ratio. The predicted pressure changes show the best agreement, with the measured decrease of pressure amplitudes along the transport pipelines, for the model based on the momentum balance of air-ash mixture flow and friction factor cor-relation given by Dogin and Lebedev for the parameter A = 1.4∙10-6. This model achieved the best correlation ratio of 93.99% for Pipeline 1 and 91.33% for Pipeline 2, as well as the best mean squared deviation of 9.58% for Pipeline 1 and 13.66% for Pipeline 2. Also, the fanning friction factor values are fully consistent with previously examined cases available in the literature. Numerical simulation model can be used for prediction of the ash pneumatic conveying capacity and pressure drop for the specified transport pipeline.
KEYWORDS
lignite fly ash, pneumatic conveying, pressure drop, friction factor, numerical modeling
PAPER SUBMITTED: 2022-07-01
PAPER REVISED: 2022-12-05
PAPER ACCEPTED: 2022-12-09
PUBLISHED ONLINE: 2023-02-25
DOI REFERENCE: https://doi.org/10.2298/TSCI2301033K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2023, VOLUME 27, ISSUE Issue 1, PAGES [33 - 45]
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Validation of numerical models for prediction of pressure drop in high capacity long distance lignite fly ash pneumatic conveying

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence