Klein, PeterPotgieter, MFerreira, Bianca A2022-05-132022-05-132021-08Klein, P., Potgieter, M. & Ferreira, B.A. 2021. Systems based CFD modelling of package steam boilers. http://hdl.handle.net/10204/12411 .http://hdl.handle.net/10204/12411Dynamic thermo-fluid models of fire-tube steam boilers can be used to optimise the design and operation of equipment, resulting in possible energy and emissions savings. This work presents the development of a dynamic boiler model of a 4-pass wetback fire-tube boiler, using the commercial 1-dimensional CFD tool Flownex®. The thermal model includes all relevant heat transfer and fluid flow phenomenon between the combustion flue gasses and the boiler water/steam. The predicted exhaust flue gas temperatures at different operating pressures are compared favourably to the performance data for a PFTA500-4 boiler, with accuracy improvements over previous modelling studies in the literature. Finally, the transient simulation capabilities of the model are demonstrated for a case of varying steam demand levels, with PID control algorithms implemented to control the feedwater control valve on the mass flowrate of fuel to the boiler. The modelled control system will be further refined in future work to include oxygen trim control over the air/fuel ratio. The completed model will be integrated into larger steam generation and distribution steam networks in Flownex, to assist industrial companies in South Africa in improving their energy efficiency.FulltextenDynamic thermo-fluid modelsFire-tube steam boilersConference PresentationKlein, P., Potgieter, M., & Ferreira, B. A. (2021). Systems based CFD modelling of package steam boilers. http://hdl.handle.net/10204/12411Klein, Peter, M Potgieter, and Bianca A Ferreira. "Systems based CFD modelling of package steam boilers." <i>ICHMT International Symposium on Advances in Computational Heat Transfer, Rio de Janeiro, Brazil, 15-19 August 2021</i> (2021): http://hdl.handle.net/10204/12411Klein P, Potgieter M, Ferreira BA, Systems based CFD modelling of package steam boilers; 2021. http://hdl.handle.net/10204/12411 .TY - Conference Presentation AU - Klein, Peter AU - Potgieter, M AU - Ferreira, Bianca A AB - Dynamic thermo-fluid models of fire-tube steam boilers can be used to optimise the design and operation of equipment, resulting in possible energy and emissions savings. This work presents the development of a dynamic boiler model of a 4-pass wetback fire-tube boiler, using the commercial 1-dimensional CFD tool Flownex®. The thermal model includes all relevant heat transfer and fluid flow phenomenon between the combustion flue gasses and the boiler water/steam. The predicted exhaust flue gas temperatures at different operating pressures are compared favourably to the performance data for a PFTA500-4 boiler, with accuracy improvements over previous modelling studies in the literature. Finally, the transient simulation capabilities of the model are demonstrated for a case of varying steam demand levels, with PID control algorithms implemented to control the feedwater control valve on the mass flowrate of fuel to the boiler. The modelled control system will be further refined in future work to include oxygen trim control over the air/fuel ratio. The completed model will be integrated into larger steam generation and distribution steam networks in Flownex, to assist industrial companies in South Africa in improving their energy efficiency. DA - 2021-08 DB - ResearchSpace DP - CSIR J1 - ICHMT International Symposium on Advances in Computational Heat Transfer, Rio de Janeiro, Brazil, 15-19 August 2021 KW - Dynamic thermo-fluid models KW - Fire-tube steam boilers LK - https://researchspace.csir.co.za PY - 2021 T1 - Systems based CFD modelling of package steam boilers TI - Systems based CFD modelling of package steam boilers UR - http://hdl.handle.net/10204/12411 ER -25622