TY  - JOUR
AU  - Rajić, Milena
AU  - Zivković, Dragoljub
AU  - Banić, Milan
AU  - Mančić, Marko
AU  - Maneski, Taško
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3746
AB  - Boilers are one of the most used units for both heat generation plants and industry systems. Their operation is subjected to different working loads and maintenance requirements. Exploitation experience points out critical boiler zones where failures and break downs typically occur. This paper analyzes critical zones in hot water fire-tube boiler. Experimental procedure was performed on the model of this type of boilers and its critical element. The tube plate of hot water boiler was identified as the most critical one. Experimental analysis and numerical model verification were performed using Aramis system based on 3-D digital image correlation method. Numerical analysis was done in ANSYS software package and verification of results was done based on measurements obtained by strain gauges and local measurements performed by the Aramis system. Stress-strain analysis indicates the critical zones of boiler tube plate. The character of change parameters such as strain and stress occurring in the critical zones can be verified both by experimental and numerical data. The paper presents a novel approach in experimental and numerical analyses that can be conducted in similar units and used for existing unit optimization, as well as for new product testing on different loads and provide opportunity for further development and improvement for practical industrial application.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate
EP  - 2145
IS  - 3
SP  - 2135
VL  - 26
DO  - 10.2298/TSCI210313207R
ER  - 

@article{
author = "Rajić, Milena and Zivković, Dragoljub and Banić, Milan and Mančić, Marko and Maneski, Taško and Milošević, Miloš and Mitrović, Nenad",
year = "2022",
abstract = "Boilers are one of the most used units for both heat generation plants and industry systems. Their operation is subjected to different working loads and maintenance requirements. Exploitation experience points out critical boiler zones where failures and break downs typically occur. This paper analyzes critical zones in hot water fire-tube boiler. Experimental procedure was performed on the model of this type of boilers and its critical element. The tube plate of hot water boiler was identified as the most critical one. Experimental analysis and numerical model verification were performed using Aramis system based on 3-D digital image correlation method. Numerical analysis was done in ANSYS software package and verification of results was done based on measurements obtained by strain gauges and local measurements performed by the Aramis system. Stress-strain analysis indicates the critical zones of boiler tube plate. The character of change parameters such as strain and stress occurring in the critical zones can be verified both by experimental and numerical data. The paper presents a novel approach in experimental and numerical analyses that can be conducted in similar units and used for existing unit optimization, as well as for new product testing on different loads and provide opportunity for further development and improvement for practical industrial application.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate",
pages = "2145-2135",
number = "3",
volume = "26",
doi = "10.2298/TSCI210313207R"
}

Rajić, M., Zivković, D., Banić, M., Mančić, M., Maneski, T., Milošević, M.,& Mitrović, N.. (2022). Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 26(3), 2135-2145.
https://doi.org/10.2298/TSCI210313207R

Rajić M, Zivković D, Banić M, Mančić M, Maneski T, Milošević M, Mitrović N. Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate. in Thermal Science. 2022;26(3):2135-2145.
doi:10.2298/TSCI210313207R .

Rajić, Milena, Zivković, Dragoljub, Banić, Milan, Mančić, Marko, Maneski, Taško, Milošević, Miloš, Mitrović, Nenad, "Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate" in Thermal Science, 26, no. 3 (2022):2135-2145,
https://doi.org/10.2298/TSCI210313207R . .

TY  - CONF
AU  - Rajić, Milena
AU  - Živković, Dragoljub
AU  - Banić, Milan
AU  - Mančić, Marko
AU  - Mitrović, Nenad
AU  - Milošević, Miloš
PY  - 2021-07
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7697
AB  - The aim of the paper is to investigate the transient regime of hot water boiler numerically and experimentally. In the regime of starting up, as the most critical one, measurements were done on the boiler critical element. The operating characteristics as well as safe and reliable operation conditions of hot water boilers are limited by thermal stresses that occur in their structure. The greatest thermal stresses occur in transient operating regimes such as starting-up, changing operation mode or sudden shutdown, resulting in uneven heating or cooling of boiler elements. Large temperature gradients cause high thermal stresses that are especially critical
in elements with thick walls. As thermal stresses may limit the heating and cooling rates of temperature changes, boiler structure is exposed to variable temperature and stress field. The largest absolute value of thermal stresses occurs at the inner surface, where direct measurements are not possible to take, since the inner surface is in direct contact with hot water under high pressure. This was the reason to measure the temperature of boiler structure inside the boiler, on tube plate, as one of the critical part of the boiler. In this paper the experimental results of temperature measurement of tube plate were presented, during the regime of starting-up. Numerical model done by FEM was verified by experimental results. The performed analysis showed that the tube plate of the first reversing chamber, the boiler element with the thickest wall, is exposed to the highest thermal stresses. This part of the boiler is exposed to temperatures
t>500 ℃ and it is exposed to creep. In conditions of creep, continuous accumulation of plastic deformations occurs at a rate that depends on the level of stress, temperature and material characteristics.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021
T1  - EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME
SP  - 30
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7697
ER  - 

@conference{
author = "Rajić, Milena and Živković, Dragoljub and Banić, Milan and Mančić, Marko and Mitrović, Nenad and Milošević, Miloš",
year = "2021-07",
abstract = "The aim of the paper is to investigate the transient regime of hot water boiler numerically and experimentally. In the regime of starting up, as the most critical one, measurements were done on the boiler critical element. The operating characteristics as well as safe and reliable operation conditions of hot water boilers are limited by thermal stresses that occur in their structure. The greatest thermal stresses occur in transient operating regimes such as starting-up, changing operation mode or sudden shutdown, resulting in uneven heating or cooling of boiler elements. Large temperature gradients cause high thermal stresses that are especially critical
in elements with thick walls. As thermal stresses may limit the heating and cooling rates of temperature changes, boiler structure is exposed to variable temperature and stress field. The largest absolute value of thermal stresses occurs at the inner surface, where direct measurements are not possible to take, since the inner surface is in direct contact with hot water under high pressure. This was the reason to measure the temperature of boiler structure inside the boiler, on tube plate, as one of the critical part of the boiler. In this paper the experimental results of temperature measurement of tube plate were presented, during the regime of starting-up. Numerical model done by FEM was verified by experimental results. The performed analysis showed that the tube plate of the first reversing chamber, the boiler element with the thickest wall, is exposed to the highest thermal stresses. This part of the boiler is exposed to temperatures
t>500 ℃ and it is exposed to creep. In conditions of creep, continuous accumulation of plastic deformations occurs at a rate that depends on the level of stress, temperature and material characteristics.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021",
title = "EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME",
pages = "30",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7697"
}

Rajić, M., Živković, D., Banić, M., Mančić, M., Mitrović, N.,& Milošević, M.. (2021-07). EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021
Innovation Center of Faculty of Mechanical Engineering., 30.
https://hdl.handle.net/21.15107/rcub_machinery_7697

Rajić M, Živković D, Banić M, Mančić M, Mitrović N, Milošević M. EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021. 2021;:30.
https://hdl.handle.net/21.15107/rcub_machinery_7697 .

Rajić, Milena, Živković, Dragoljub, Banić, Milan, Mančić, Marko, Mitrović, Nenad, Milošević, Miloš, "EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021 (2021-07):30,
https://hdl.handle.net/21.15107/rcub_machinery_7697 .

TY  - CHAP
AU  - Rajić, M.
AU  - Živković, D.
AU  - Banić, M.
AU  - Mančić, Marko
AU  - Milošević, Miloš
AU  - Maneski, Taško
AU  - Mitrović, Nenad
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3681
AB  - Hot water boilers are most commonly used devices in thermal and industrial plants for heat production. Boilers elements are exposed to high pressures and temperatures during boiler operation. Non-stationary working regimes of boiler may lead to breakdowns and fatigue of boiler elements. There are numerous cases of breakdowns of such units, which lead to reduced reliability and safety of the plant. In order to avoid this state, certain investigation should be made that would examine the influence of different regimes on the boiler structure. Lack of available data concerning the temperature as well as stress-strain field in boiler elements led us to perform such kind of experiment. This paper presents results of numerical analysis performed on the modelled boiler. Validation of the numerical model was performed based on experimental results obtained using DIC (Digital Image Correlation) method by using Aramis system. The character of parameters change, such as strain and stress, occurring in the critical zones of boiler elements can be verified both by experimental and numerical results. In this paper the novel approach of experimental and numerical analysis is presented. The method can be used and conducted in similar units for testing on different loads or working regimes, as well as to improve the safety and reliability of similar pressure vessel units.
PB  - Springer
T2  - Lecture Notes in Networks and Systems
T1  - Experimental and numerical analysis of stress-strain field of the modelled boiler element
EP  - 273
SP  - 257
VL  - 153
DO  - 10.1007/978-3-030-58362-0_15
ER  - 

@inbook{
author = "Rajić, M. and Živković, D. and Banić, M. and Mančić, Marko and Milošević, Miloš and Maneski, Taško and Mitrović, Nenad",
year = "2021",
abstract = "Hot water boilers are most commonly used devices in thermal and industrial plants for heat production. Boilers elements are exposed to high pressures and temperatures during boiler operation. Non-stationary working regimes of boiler may lead to breakdowns and fatigue of boiler elements. There are numerous cases of breakdowns of such units, which lead to reduced reliability and safety of the plant. In order to avoid this state, certain investigation should be made that would examine the influence of different regimes on the boiler structure. Lack of available data concerning the temperature as well as stress-strain field in boiler elements led us to perform such kind of experiment. This paper presents results of numerical analysis performed on the modelled boiler. Validation of the numerical model was performed based on experimental results obtained using DIC (Digital Image Correlation) method by using Aramis system. The character of parameters change, such as strain and stress, occurring in the critical zones of boiler elements can be verified both by experimental and numerical results. In this paper the novel approach of experimental and numerical analysis is presented. The method can be used and conducted in similar units for testing on different loads or working regimes, as well as to improve the safety and reliability of similar pressure vessel units.",
publisher = "Springer",
journal = "Lecture Notes in Networks and Systems",
booktitle = "Experimental and numerical analysis of stress-strain field of the modelled boiler element",
pages = "273-257",
volume = "153",
doi = "10.1007/978-3-030-58362-0_15"
}

Rajić, M., Živković, D., Banić, M., Mančić, M., Milošević, M., Maneski, T.,& Mitrović, N.. (2021). Experimental and numerical analysis of stress-strain field of the modelled boiler element. in Lecture Notes in Networks and Systems
Springer., 153, 257-273.
https://doi.org/10.1007/978-3-030-58362-0_15

Rajić M, Živković D, Banić M, Mančić M, Milošević M, Maneski T, Mitrović N. Experimental and numerical analysis of stress-strain field of the modelled boiler element. in Lecture Notes in Networks and Systems. 2021;153:257-273.
doi:10.1007/978-3-030-58362-0_15 .

Rajić, M., Živković, D., Banić, M., Mančić, Marko, Milošević, Miloš, Maneski, Taško, Mitrović, Nenad, "Experimental and numerical analysis of stress-strain field of the modelled boiler element" in Lecture Notes in Networks and Systems, 153 (2021):257-273,
https://doi.org/10.1007/978-3-030-58362-0_15 . .

TY  - CONF
AU  - Rajić, Milena
AU  - Živković, Dragoljub
AU  - Banić, Milan
AU  - Mančić, Marko
AU  - Milošević, Miloš
AU  - Maneski, Taško
AU  - Mitrović, Nenad
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7695
AB  - Hot water boilers, especially boilers with fire tube where the combustion takes place, are widely used in process industry. Elements of the boiler are exposed to high pressures and temperatures during boiler operation. Exploitation experience indicates constant and permanent breakdowns occurring as a result of accidental states of individual boiler elements. Studies done before in this field indicate certain critical boiler elements that may have influence on the reliability and safety of the entire unit. In order to avoid this state, certain investigation should be made that would examine the influence of different regimes on the boiler structure. Lack of available data concerning the temperature as well as stress-strain field in boiler elements led us to perform such kind of experiment. This paper presents results of numerical analysis performed on the modelled
boiler. Validation of the numerical model was performed based on experimental results obtained using 3D Digital Image Correlation analysis. This paper analyses critical elements of the hot water boiler by experimental data obtained from its model and improved numerical model in order to analyze constrains and loads the model is exposed to and to have fully-covered stress-strain field obtained from experimental data.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2020
T1  - 3D DIGITAL IMAGE CORRELATION ANALYSIS OF THE MODELLED BOILER ELEMENT
SP  - 15
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7695
ER  - 

@conference{
author = "Rajić, Milena and Živković, Dragoljub and Banić, Milan and Mančić, Marko and Milošević, Miloš and Maneski, Taško and Mitrović, Nenad",
year = "2020",
abstract = "Hot water boilers, especially boilers with fire tube where the combustion takes place, are widely used in process industry. Elements of the boiler are exposed to high pressures and temperatures during boiler operation. Exploitation experience indicates constant and permanent breakdowns occurring as a result of accidental states of individual boiler elements. Studies done before in this field indicate certain critical boiler elements that may have influence on the reliability and safety of the entire unit. In order to avoid this state, certain investigation should be made that would examine the influence of different regimes on the boiler structure. Lack of available data concerning the temperature as well as stress-strain field in boiler elements led us to perform such kind of experiment. This paper presents results of numerical analysis performed on the modelled
boiler. Validation of the numerical model was performed based on experimental results obtained using 3D Digital Image Correlation analysis. This paper analyses critical elements of the hot water boiler by experimental data obtained from its model and improved numerical model in order to analyze constrains and loads the model is exposed to and to have fully-covered stress-strain field obtained from experimental data.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2020",
title = "3D DIGITAL IMAGE CORRELATION ANALYSIS OF THE MODELLED BOILER ELEMENT",
pages = "15",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7695"
}

Rajić, M., Živković, D., Banić, M., Mančić, M., Milošević, M., Maneski, T.,& Mitrović, N.. (2020). 3D DIGITAL IMAGE CORRELATION ANALYSIS OF THE MODELLED BOILER ELEMENT. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2020
Innovation Center of Faculty of Mechanical Engineering., 15.
https://hdl.handle.net/21.15107/rcub_machinery_7695

Rajić M, Živković D, Banić M, Mančić M, Milošević M, Maneski T, Mitrović N. 3D DIGITAL IMAGE CORRELATION ANALYSIS OF THE MODELLED BOILER ELEMENT. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2020. 2020;:15.
https://hdl.handle.net/21.15107/rcub_machinery_7695 .

Rajić, Milena, Živković, Dragoljub, Banić, Milan, Mančić, Marko, Milošević, Miloš, Maneski, Taško, Mitrović, Nenad, "3D DIGITAL IMAGE CORRELATION ANALYSIS OF THE MODELLED BOILER ELEMENT" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2020 (2020):15,
https://hdl.handle.net/21.15107/rcub_machinery_7695 .

TY  - JOUR
AU  - Laković, Mirjana S.
AU  - Pavlović, Ivan
AU  - Banjac, Miloš
AU  - Jović, Milica M.
AU  - Mančić, Marko
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2578
AB  - Electricity is a key energy source in each country and an important condition for economic development. It is necessary to use modern methods and tools to predict energy consumption for different types of systems and weather conditions. In every industrial plant, electricity consumption presents one of the greatest operating costs. Monitoring and forecasting of this parameter provide the opportunity to rationalize the use of electricity and thus significantly reduce the costs. The paper proposes the prediction of energy consumption by a new time-series model. This involves time series models using a set of previously collected data to predict the future load. The most commonly used linear time series models are the AR (Autoregressive Model), MA (Moving Average) and ARMA (Autoregressive Moving Average Model). The AR model is used in this paper. Using the AR (Autoregressive Model) model, the Monte Carlo simulation method is utilized for predicting and analyzing the energy consumption change in the considered tobacco industrial plant. One of the main parts of the AR model is a seasonal pattern that takes into account the climatic conditions for a given geographical area. This part of the model was delineated by the Fourier transform and was used with the aim of avoiding the model complexity. As an example, the numerical results were performed for tobacco production in one industrial plant. A probabilistic range of input values is used to determine the future probabilistic level of energy consumption.
PB  - Univerzitet u Nišu, Niš
T2  - Facta Universitatis-Series Mechanical Engineering
T1  - Numerical computation and prediction of electricity consumption in tobacco industry
EP  - 465
IS  - 3
SP  - 457
VL  - 15
DO  - 10.22190/FUME170927025L
ER  - 

@article{
author = "Laković, Mirjana S. and Pavlović, Ivan and Banjac, Miloš and Jović, Milica M. and Mančić, Marko",
year = "2017",
abstract = "Electricity is a key energy source in each country and an important condition for economic development. It is necessary to use modern methods and tools to predict energy consumption for different types of systems and weather conditions. In every industrial plant, electricity consumption presents one of the greatest operating costs. Monitoring and forecasting of this parameter provide the opportunity to rationalize the use of electricity and thus significantly reduce the costs. The paper proposes the prediction of energy consumption by a new time-series model. This involves time series models using a set of previously collected data to predict the future load. The most commonly used linear time series models are the AR (Autoregressive Model), MA (Moving Average) and ARMA (Autoregressive Moving Average Model). The AR model is used in this paper. Using the AR (Autoregressive Model) model, the Monte Carlo simulation method is utilized for predicting and analyzing the energy consumption change in the considered tobacco industrial plant. One of the main parts of the AR model is a seasonal pattern that takes into account the climatic conditions for a given geographical area. This part of the model was delineated by the Fourier transform and was used with the aim of avoiding the model complexity. As an example, the numerical results were performed for tobacco production in one industrial plant. A probabilistic range of input values is used to determine the future probabilistic level of energy consumption.",
publisher = "Univerzitet u Nišu, Niš",
journal = "Facta Universitatis-Series Mechanical Engineering",
title = "Numerical computation and prediction of electricity consumption in tobacco industry",
pages = "465-457",
number = "3",
volume = "15",
doi = "10.22190/FUME170927025L"
}

Laković, M. S., Pavlović, I., Banjac, M., Jović, M. M.,& Mančić, M.. (2017). Numerical computation and prediction of electricity consumption in tobacco industry. in Facta Universitatis-Series Mechanical Engineering
Univerzitet u Nišu, Niš., 15(3), 457-465.
https://doi.org/10.22190/FUME170927025L

Laković MS, Pavlović I, Banjac M, Jović MM, Mančić M. Numerical computation and prediction of electricity consumption in tobacco industry. in Facta Universitatis-Series Mechanical Engineering. 2017;15(3):457-465.
doi:10.22190/FUME170927025L .

Laković, Mirjana S., Pavlović, Ivan, Banjac, Miloš, Jović, Milica M., Mančić, Marko, "Numerical computation and prediction of electricity consumption in tobacco industry" in Facta Universitatis-Series Mechanical Engineering, 15, no. 3 (2017):457-465,
https://doi.org/10.22190/FUME170927025L . .