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  - 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 . .