TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Wala, Tadeusz
AU  - Milivojević, Sanja
AU  - Ilić, Milica
AU  - Muszynski, Slawomir
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3059
AB  - A substantial potential exists for the recovery of flue gas waste heat at aged coal-fired power plants. High and low pressure economizers (HPE, LPE) can be applied for this purpose. Two cases of the feedwater supply to the HPE are considered: a supply of the "cold" feedwater taken from the feedwater pump discharge line and a supply of the "hot" feedwater taken after high pressure heaters. The LPE is fed by condensate taken from the low pressure condensate line. The heat transfer area of economizers is equal in all cases. The heat transfer rate of the LPE is maximized by the lowest possible condensate temperature at the economizer inlet, which is limited by the acid dew point temperature. The power upgrade by the HPE fed with the "cold" feedwater is by 2.5 times higher than in case with the LPE. The plant efficiency upgrade by the LPE is by 20% higher than in case with the HPE fed with "cold" feedwater. The HPE fed with the hot feedwater is not competitive. The presented overall benefits achieved by the HPE fed with the cold feedwater justify its implementation at the aged 620 MWe power plant.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy
T1  - Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation
SP  - 115980
VL  - 187
DO  - 10.1016/j.energy.2019.115980
ER  - 

@article{
author = "Stevanović, Vladimir and Petrović, Milan M. and Wala, Tadeusz and Milivojević, Sanja and Ilić, Milica and Muszynski, Slawomir",
year = "2019",
abstract = "A substantial potential exists for the recovery of flue gas waste heat at aged coal-fired power plants. High and low pressure economizers (HPE, LPE) can be applied for this purpose. Two cases of the feedwater supply to the HPE are considered: a supply of the "cold" feedwater taken from the feedwater pump discharge line and a supply of the "hot" feedwater taken after high pressure heaters. The LPE is fed by condensate taken from the low pressure condensate line. The heat transfer area of economizers is equal in all cases. The heat transfer rate of the LPE is maximized by the lowest possible condensate temperature at the economizer inlet, which is limited by the acid dew point temperature. The power upgrade by the HPE fed with the "cold" feedwater is by 2.5 times higher than in case with the LPE. The plant efficiency upgrade by the LPE is by 20% higher than in case with the HPE fed with "cold" feedwater. The HPE fed with the hot feedwater is not competitive. The presented overall benefits achieved by the HPE fed with the cold feedwater justify its implementation at the aged 620 MWe power plant.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy",
title = "Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation",
pages = "115980",
volume = "187",
doi = "10.1016/j.energy.2019.115980"
}

Stevanović, V., Petrović, M. M., Wala, T., Milivojević, S., Ilić, M.,& Muszynski, S.. (2019). Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation. in Energy
Pergamon-Elsevier Science Ltd, Oxford., 187, 115980.
https://doi.org/10.1016/j.energy.2019.115980

Stevanović V, Petrović MM, Wala T, Milivojević S, Ilić M, Muszynski S. Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation. in Energy. 2019;187:115980.
doi:10.1016/j.energy.2019.115980 .

Stevanović, Vladimir, Petrović, Milan M., Wala, Tadeusz, Milivojević, Sanja, Ilić, Milica, Muszynski, Slawomir, "Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation" in Energy, 187 (2019):115980,
https://doi.org/10.1016/j.energy.2019.115980 . .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Ilić, Milica
AU  - Djurović, Željko
AU  - Wala, Tadeusz
AU  - Muszynski, Slawomir
AU  - Gajić, Ivan
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2939
AB  - Coal-fired thermal power plants (TPPs) had been generally designed to cover base loads of electricity consumption. Nowadays, they should be flexible to participate in the primary frequency control of electric system, especially because of increased number of wind and solar plants with intermittent electricity production. In this paper a new method for the primary power control in TPPs is presented, based on the feedwater flow rate changes between the feedwater heaters (FWHs) and an additional high pressure economizer. The achieved primary power control reserve is demonstrated by measurements at the lignite-fired 650 MWe TPP after its retrofit by the installation of the high pressure economizer in parallel with FWHs. In addition, the TPP transient operation during the primary control are simulated and analyzed with the developed thermal-hydraulic model of the steam turbine heat regeneration system. The control reserve of approximately 10 MWe is shown both by measured data and results of numerical simulations. The control reserve is originally provided by the fresh steam throttling in front of the turbine, but this throttling can be reduced by the application of the new method. The rates of change of wall temperatures of FWHs tubes are within allowed limits during the transients.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy
T1  - Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B"
EP  - 798
SP  - 782
VL  - 147
DO  - 10.1016/j.energy.2018.01.102
ER  - 

@article{
author = "Stevanović, Vladimir and Ilić, Milica and Djurović, Željko and Wala, Tadeusz and Muszynski, Slawomir and Gajić, Ivan",
year = "2018",
abstract = "Coal-fired thermal power plants (TPPs) had been generally designed to cover base loads of electricity consumption. Nowadays, they should be flexible to participate in the primary frequency control of electric system, especially because of increased number of wind and solar plants with intermittent electricity production. In this paper a new method for the primary power control in TPPs is presented, based on the feedwater flow rate changes between the feedwater heaters (FWHs) and an additional high pressure economizer. The achieved primary power control reserve is demonstrated by measurements at the lignite-fired 650 MWe TPP after its retrofit by the installation of the high pressure economizer in parallel with FWHs. In addition, the TPP transient operation during the primary control are simulated and analyzed with the developed thermal-hydraulic model of the steam turbine heat regeneration system. The control reserve of approximately 10 MWe is shown both by measured data and results of numerical simulations. The control reserve is originally provided by the fresh steam throttling in front of the turbine, but this throttling can be reduced by the application of the new method. The rates of change of wall temperatures of FWHs tubes are within allowed limits during the transients.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy",
title = "Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B"",
pages = "798-782",
volume = "147",
doi = "10.1016/j.energy.2018.01.102"
}

Stevanović, V., Ilić, M., Djurović, Ž., Wala, T., Muszynski, S.,& Gajić, I.. (2018). Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B". in Energy
Pergamon-Elsevier Science Ltd, Oxford., 147, 782-798.
https://doi.org/10.1016/j.energy.2018.01.102

Stevanović V, Ilić M, Djurović Ž, Wala T, Muszynski S, Gajić I. Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B". in Energy. 2018;147:782-798.
doi:10.1016/j.energy.2018.01.102 .

Stevanović, Vladimir, Ilić, Milica, Djurović, Željko, Wala, Tadeusz, Muszynski, Slawomir, Gajić, Ivan, "Primary control reserve of electric power by feedwater flow rate change through an additional economizer - A case study of the thermal power plant "Nikola Tesla B"" in Energy, 147 (2018):782-798,
https://doi.org/10.1016/j.energy.2018.01.102 . .

TY  - CONF
AU  - Stevanović, Vladimir
AU  - Petrović, Milan M.
AU  - Wala, Tadeusz
AU  - Gajić, Ivan
AU  - Muszynski, Sławomir
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4526
AB  - A substantial potential exists for the thermal power plants efficiency and power upgrades by the 
utilization of flue gas waste heat at the steam boiler. The paper presents solutions for the waste heat 
utilization and different balance of plant modifications for the regeneration of waste heat into the plant 
thermodynamic cycle. A comparative analysis of different solution modes is performed for the more 
than 30 years aged lignite-fired 2x620 MWe power plant “Nikola Tesla B”. Different modes of waste 
heat regeneration into the plant cycle are flue gas cooling by the “cold” feedwater taken from the main 
feedwater pump discharge line before high pressure heaters, by the “hot” feedwater after the high 
pressure heaters and by the condensate taken from the low pressure condensate line. The energy 
efficiency and power upgrades of proposed methods is evaluated and compared. The highest increase 
of power plant efficiency is achieved by the flue gas cooling by the feedwater taken from the feedwater 
pump discharge line. This solution was implemented within the first phase of power plant overhaul, with 
a reduction of the flue gas temperature for more than 20 
oC and the boiler and power plant efficiency 
increases of approximately 2 and 0.53 percentage points respectively.
PB  - Institute of Thermal Technology, Gliwice, Poland, Silesian University of Technology
C3  - Proceedings of the 5th International Conference on Contemporary Problems of Thermal Engineering Energy Systems in the Near Future: Energy, Exergy, Ecology and Economics, (CPOTE 2018), Gliwice, Poland, 19-21 September, 2018
T1  - Analysis of efficiency and power upgrades at the lignite-fired 2x620 MWe power plant by steam boiler waste heat utilization and different balance of plant modifications
EP  - 392
SP  - 385
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4526
ER  - 

@conference{
author = "Stevanović, Vladimir and Petrović, Milan M. and Wala, Tadeusz and Gajić, Ivan and Muszynski, Sławomir",
year = "2018",
abstract = "A substantial potential exists for the thermal power plants efficiency and power upgrades by the 
utilization of flue gas waste heat at the steam boiler. The paper presents solutions for the waste heat 
utilization and different balance of plant modifications for the regeneration of waste heat into the plant 
thermodynamic cycle. A comparative analysis of different solution modes is performed for the more 
than 30 years aged lignite-fired 2x620 MWe power plant “Nikola Tesla B”. Different modes of waste 
heat regeneration into the plant cycle are flue gas cooling by the “cold” feedwater taken from the main 
feedwater pump discharge line before high pressure heaters, by the “hot” feedwater after the high 
pressure heaters and by the condensate taken from the low pressure condensate line. The energy 
efficiency and power upgrades of proposed methods is evaluated and compared. The highest increase 
of power plant efficiency is achieved by the flue gas cooling by the feedwater taken from the feedwater 
pump discharge line. This solution was implemented within the first phase of power plant overhaul, with 
a reduction of the flue gas temperature for more than 20 
oC and the boiler and power plant efficiency 
increases of approximately 2 and 0.53 percentage points respectively.",
publisher = "Institute of Thermal Technology, Gliwice, Poland, Silesian University of Technology",
journal = "Proceedings of the 5th International Conference on Contemporary Problems of Thermal Engineering Energy Systems in the Near Future: Energy, Exergy, Ecology and Economics, (CPOTE 2018), Gliwice, Poland, 19-21 September, 2018",
title = "Analysis of efficiency and power upgrades at the lignite-fired 2x620 MWe power plant by steam boiler waste heat utilization and different balance of plant modifications",
pages = "392-385",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4526"
}

Stevanović, V., Petrović, M. M., Wala, T., Gajić, I.,& Muszynski, S.. (2018). Analysis of efficiency and power upgrades at the lignite-fired 2x620 MWe power plant by steam boiler waste heat utilization and different balance of plant modifications. in Proceedings of the 5th International Conference on Contemporary Problems of Thermal Engineering Energy Systems in the Near Future: Energy, Exergy, Ecology and Economics, (CPOTE 2018), Gliwice, Poland, 19-21 September, 2018
Institute of Thermal Technology, Gliwice, Poland, Silesian University of Technology., 385-392.
https://hdl.handle.net/21.15107/rcub_machinery_4526

Stevanović V, Petrović MM, Wala T, Gajić I, Muszynski S. Analysis of efficiency and power upgrades at the lignite-fired 2x620 MWe power plant by steam boiler waste heat utilization and different balance of plant modifications. in Proceedings of the 5th International Conference on Contemporary Problems of Thermal Engineering Energy Systems in the Near Future: Energy, Exergy, Ecology and Economics, (CPOTE 2018), Gliwice, Poland, 19-21 September, 2018. 2018;:385-392.
https://hdl.handle.net/21.15107/rcub_machinery_4526 .

Stevanović, Vladimir, Petrović, Milan M., Wala, Tadeusz, Gajić, Ivan, Muszynski, Sławomir, "Analysis of efficiency and power upgrades at the lignite-fired 2x620 MWe power plant by steam boiler waste heat utilization and different balance of plant modifications" in Proceedings of the 5th International Conference on Contemporary Problems of Thermal Engineering Energy Systems in the Near Future: Energy, Exergy, Ecology and Economics, (CPOTE 2018), Gliwice, Poland, 19-21 September, 2018 (2018):385-392,
https://hdl.handle.net/21.15107/rcub_machinery_4526 .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Wala, Tadeusz
AU  - Muszynski, Slawomir
AU  - Milić, Miloš
AU  - Jovanović, Milorad
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2001
AB  - An additional high pressure economizer was installed at Unit B1 of the 620 MWe lignite-fired Power Plant "Nikola Tesla B" after 30 years of its operation. An innovative connection of the new additional economizer was applied. It is in parallel connection to the first section of the originally built economizer and it is directly fed with the feedwater from the outlet of the feedwater pump. The analysis of Unit B1 operation with such an economizer arrangement is performed and it is supported by measured data. It is shown that more than 30 MWth of the flue gas waste heat is recovered. The Unit gross efficiency is increased by 0.53 percentage points, which leads to 9.4 MWe of the electric power production. The parallel connection of the additional economizer also leads to the partial feedwater bypass of the high pressure heaters, which enables an increase of the plant electric power by up to 24.5 MWe. The accompanying effects are the reduction of the pressure drop in the feedwater line and the economizers, which leads to the decrease of the energy consumption for the main feedwater pump operation. The applied solution is presented together with measured and calculated energy and economic benefits.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy
T1  - Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant
EP  - 918
SP  - 907
VL  - 66
DO  - 10.1016/j.energy.2014.01.001
ER  - 

@article{
author = "Stevanović, Vladimir and Wala, Tadeusz and Muszynski, Slawomir and Milić, Miloš and Jovanović, Milorad",
year = "2014",
abstract = "An additional high pressure economizer was installed at Unit B1 of the 620 MWe lignite-fired Power Plant "Nikola Tesla B" after 30 years of its operation. An innovative connection of the new additional economizer was applied. It is in parallel connection to the first section of the originally built economizer and it is directly fed with the feedwater from the outlet of the feedwater pump. The analysis of Unit B1 operation with such an economizer arrangement is performed and it is supported by measured data. It is shown that more than 30 MWth of the flue gas waste heat is recovered. The Unit gross efficiency is increased by 0.53 percentage points, which leads to 9.4 MWe of the electric power production. The parallel connection of the additional economizer also leads to the partial feedwater bypass of the high pressure heaters, which enables an increase of the plant electric power by up to 24.5 MWe. The accompanying effects are the reduction of the pressure drop in the feedwater line and the economizers, which leads to the decrease of the energy consumption for the main feedwater pump operation. The applied solution is presented together with measured and calculated energy and economic benefits.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy",
title = "Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant",
pages = "918-907",
volume = "66",
doi = "10.1016/j.energy.2014.01.001"
}

Stevanović, V., Wala, T., Muszynski, S., Milić, M.,& Jovanović, M.. (2014). Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant. in Energy
Pergamon-Elsevier Science Ltd, Oxford., 66, 907-918.
https://doi.org/10.1016/j.energy.2014.01.001

Stevanović V, Wala T, Muszynski S, Milić M, Jovanović M. Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant. in Energy. 2014;66:907-918.
doi:10.1016/j.energy.2014.01.001 .

Stevanović, Vladimir, Wala, Tadeusz, Muszynski, Slawomir, Milić, Miloš, Jovanović, Milorad, "Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant" in Energy, 66 (2014):907-918,
https://doi.org/10.1016/j.energy.2014.01.001 . .