Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace
Аутори
Crnomarković, NenadBelošević, Srđan
Tomanović, Ivan
Milićević, Aleksandar
Stojanović, Andrijana
Tucaković, Dragan
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on... the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%.
Кључне речи:
flame temperature / furnace / numerical investigation / pulverized coal / temperature fluctuation / turbulence-radiation interaction / wall fluxИзвор:
Thermal Science, 2023, 27, 6 Part A, 4539-4549Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200017 (Универзитет у Београду, Институт за нуклеарне науке Винча, Београд-Винча) (RS-MESTD-inst-2020-200017)
Колекције
Институција/група
VinčaTY - JOUR AU - Crnomarković, Nenad AU - Belošević, Srđan AU - Tomanović, Ivan AU - Milićević, Aleksandar AU - Stojanović, Andrijana AU - Tucaković, Dragan PY - 2023 UR - https://vinar.vin.bg.ac.rs/handle/123456789/12245 AB - In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%. T2 - Thermal Science T1 - Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace VL - 27 IS - 6 Part A SP - 4539 EP - 4549 DO - 10.2298/TSCI230609173C ER -
@article{ author = "Crnomarković, Nenad and Belošević, Srđan and Tomanović, Ivan and Milićević, Aleksandar and Stojanović, Andrijana and Tucaković, Dragan", year = "2023", abstract = "In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%.", journal = "Thermal Science", title = "Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace", volume = "27", number = "6 Part A", pages = "4539-4549", doi = "10.2298/TSCI230609173C" }
Crnomarković, N., Belošević, S., Tomanović, I., Milićević, A., Stojanović, A.,& Tucaković, D.. (2023). Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace. in Thermal Science, 27(6 Part A), 4539-4549. https://doi.org/10.2298/TSCI230609173C
Crnomarković N, Belošević S, Tomanović I, Milićević A, Stojanović A, Tucaković D. Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace. in Thermal Science. 2023;27(6 Part A):4539-4549. doi:10.2298/TSCI230609173C .
Crnomarković, Nenad, Belošević, Srđan, Tomanović, Ivan, Milićević, Aleksandar, Stojanović, Andrijana, Tucaković, Dragan, "Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace" in Thermal Science, 27, no. 6 Part A (2023):4539-4549, https://doi.org/10.2298/TSCI230609173C . .