Termohidraulika isparivača ložišta parnog kotla sa prinudnom cirkulacijom
Thermal-hydraulics of evaporating tubes in the forced circulation loop of a steam boiler
Апстракт
Elektroprivreda Srbije je u toku 2005. godine nastavila radove na izgradnji TE Kolubara B snage 350 MW, koji su započeti još davne 1989. godine. Sam kotao je toranjske konstrukcije, a za isparivač kotla predviđeno je cirkulaciono kolo sa prinudnim strujanjem. Osim toga, ekranske cevi u ložištu su ožljebljene sa unutrašnje strane, što predstavlja jedinstveni slučaj u kotlovima termoelektrana u Srbiji. Da bi se izvršile termohidrauličke analize ovog isparivača urađeni su termički proračuni kotla, kao i hidraulički proračuni isparivača za različita radna opterećenja. U ovom radu prikazana je metodologija hidrauličkog proračuna isparivača sa prinudnom cirkulacijom. Na osnovu dobijenih rezultata, za spomenuti kotao, izvršena je analiza uticaja ožljebljenja cevi na povećanje hidrauličkog otpora u cirkulacionom kolu. S obzirom da ožljebljene cevi obezbeđuju sigurniji rad isparivača, održavajući nisku temperaturu zida cevi i pri visokim sadržajima pare, vršeno je njihovo upoređivanje sa glatki...m cevima za slučajeve ravnomernog i neravnomernog toplotnog opterećenja u ložištu.
Rifled evaporating tubes are applied in a steam boiler with the aim to increase the steam-water mixture turbulization and to prevent tubes' wall burnout. The evaporating rifled tubes and the working fluid forced circulation are applied in the steam boiler at the Thermal Power Plant 'Kolubara B' that is being built by the Electric Power Utility of Serbia. In order to investigate operating characteristics of the steam boiler of such an advanced design, a simulation and analysis of complex coupled thermal processes on the furnace gas side and thermal-hydraulics in the evaporating tubes were performed for the whole range of the plant designed operating loads. In this paper the methodology for the hydraulic calculations of forced circulation loops is presented. The rifled tubes thermal-hydraulics is calculated. An acceptable temperature of the evaporating tube wall, even under a high void fraction of the coolant is obtained. It is shown that the rifled tubes prevent the occurrence of the cr...itical heat transfer conditions. The obtained increased thermal safety margin of the rifled tubes is compared with the safety margin of the smooth tubes for uniform and variable heat loads between walls of the boiler furnace. The influence of the rifled tubes on the increase of the hydraulic resistance in the circulation loop is analyzed.
Кључне речи:
thermalhydraulic calculation / steam boiler / rifled tubes / forced circulationИзвор:
FME Transactions, 2008, 36, 1, 9-19Издавач:
- Univerzitet u Beogradu - Mašinski fakultet, Beograd
Институција/група
Inovacioni centarTY - JOUR AU - Tucaković, Dragan AU - Stevanović, Vladimir AU - Živanović, Titoslav PY - 2008 UR - https://machinery.mas.bg.ac.rs/handle/123456789/791 AB - Elektroprivreda Srbije je u toku 2005. godine nastavila radove na izgradnji TE Kolubara B snage 350 MW, koji su započeti još davne 1989. godine. Sam kotao je toranjske konstrukcije, a za isparivač kotla predviđeno je cirkulaciono kolo sa prinudnim strujanjem. Osim toga, ekranske cevi u ložištu su ožljebljene sa unutrašnje strane, što predstavlja jedinstveni slučaj u kotlovima termoelektrana u Srbiji. Da bi se izvršile termohidrauličke analize ovog isparivača urađeni su termički proračuni kotla, kao i hidraulički proračuni isparivača za različita radna opterećenja. U ovom radu prikazana je metodologija hidrauličkog proračuna isparivača sa prinudnom cirkulacijom. Na osnovu dobijenih rezultata, za spomenuti kotao, izvršena je analiza uticaja ožljebljenja cevi na povećanje hidrauličkog otpora u cirkulacionom kolu. S obzirom da ožljebljene cevi obezbeđuju sigurniji rad isparivača, održavajući nisku temperaturu zida cevi i pri visokim sadržajima pare, vršeno je njihovo upoređivanje sa glatkim cevima za slučajeve ravnomernog i neravnomernog toplotnog opterećenja u ložištu. AB - Rifled evaporating tubes are applied in a steam boiler with the aim to increase the steam-water mixture turbulization and to prevent tubes' wall burnout. The evaporating rifled tubes and the working fluid forced circulation are applied in the steam boiler at the Thermal Power Plant 'Kolubara B' that is being built by the Electric Power Utility of Serbia. In order to investigate operating characteristics of the steam boiler of such an advanced design, a simulation and analysis of complex coupled thermal processes on the furnace gas side and thermal-hydraulics in the evaporating tubes were performed for the whole range of the plant designed operating loads. In this paper the methodology for the hydraulic calculations of forced circulation loops is presented. The rifled tubes thermal-hydraulics is calculated. An acceptable temperature of the evaporating tube wall, even under a high void fraction of the coolant is obtained. It is shown that the rifled tubes prevent the occurrence of the critical heat transfer conditions. The obtained increased thermal safety margin of the rifled tubes is compared with the safety margin of the smooth tubes for uniform and variable heat loads between walls of the boiler furnace. The influence of the rifled tubes on the increase of the hydraulic resistance in the circulation loop is analyzed. PB - Univerzitet u Beogradu - Mašinski fakultet, Beograd T2 - FME Transactions T1 - Termohidraulika isparivača ložišta parnog kotla sa prinudnom cirkulacijom T1 - Thermal-hydraulics of evaporating tubes in the forced circulation loop of a steam boiler EP - 19 IS - 1 SP - 9 VL - 36 UR - https://hdl.handle.net/21.15107/rcub_machinery_791 ER -
@article{ author = "Tucaković, Dragan and Stevanović, Vladimir and Živanović, Titoslav", year = "2008", abstract = "Elektroprivreda Srbije je u toku 2005. godine nastavila radove na izgradnji TE Kolubara B snage 350 MW, koji su započeti još davne 1989. godine. Sam kotao je toranjske konstrukcije, a za isparivač kotla predviđeno je cirkulaciono kolo sa prinudnim strujanjem. Osim toga, ekranske cevi u ložištu su ožljebljene sa unutrašnje strane, što predstavlja jedinstveni slučaj u kotlovima termoelektrana u Srbiji. Da bi se izvršile termohidrauličke analize ovog isparivača urađeni su termički proračuni kotla, kao i hidraulički proračuni isparivača za različita radna opterećenja. U ovom radu prikazana je metodologija hidrauličkog proračuna isparivača sa prinudnom cirkulacijom. Na osnovu dobijenih rezultata, za spomenuti kotao, izvršena je analiza uticaja ožljebljenja cevi na povećanje hidrauličkog otpora u cirkulacionom kolu. S obzirom da ožljebljene cevi obezbeđuju sigurniji rad isparivača, održavajući nisku temperaturu zida cevi i pri visokim sadržajima pare, vršeno je njihovo upoređivanje sa glatkim cevima za slučajeve ravnomernog i neravnomernog toplotnog opterećenja u ložištu., Rifled evaporating tubes are applied in a steam boiler with the aim to increase the steam-water mixture turbulization and to prevent tubes' wall burnout. The evaporating rifled tubes and the working fluid forced circulation are applied in the steam boiler at the Thermal Power Plant 'Kolubara B' that is being built by the Electric Power Utility of Serbia. In order to investigate operating characteristics of the steam boiler of such an advanced design, a simulation and analysis of complex coupled thermal processes on the furnace gas side and thermal-hydraulics in the evaporating tubes were performed for the whole range of the plant designed operating loads. In this paper the methodology for the hydraulic calculations of forced circulation loops is presented. The rifled tubes thermal-hydraulics is calculated. An acceptable temperature of the evaporating tube wall, even under a high void fraction of the coolant is obtained. It is shown that the rifled tubes prevent the occurrence of the critical heat transfer conditions. The obtained increased thermal safety margin of the rifled tubes is compared with the safety margin of the smooth tubes for uniform and variable heat loads between walls of the boiler furnace. The influence of the rifled tubes on the increase of the hydraulic resistance in the circulation loop is analyzed.", publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd", journal = "FME Transactions", title = "Termohidraulika isparivača ložišta parnog kotla sa prinudnom cirkulacijom, Thermal-hydraulics of evaporating tubes in the forced circulation loop of a steam boiler", pages = "19-9", number = "1", volume = "36", url = "https://hdl.handle.net/21.15107/rcub_machinery_791" }
Tucaković, D., Stevanović, V.,& Živanović, T.. (2008). Termohidraulika isparivača ložišta parnog kotla sa prinudnom cirkulacijom. in FME Transactions Univerzitet u Beogradu - Mašinski fakultet, Beograd., 36(1), 9-19. https://hdl.handle.net/21.15107/rcub_machinery_791
Tucaković D, Stevanović V, Živanović T. Termohidraulika isparivača ložišta parnog kotla sa prinudnom cirkulacijom. in FME Transactions. 2008;36(1):9-19. https://hdl.handle.net/21.15107/rcub_machinery_791 .
Tucaković, Dragan, Stevanović, Vladimir, Živanović, Titoslav, "Termohidraulika isparivača ložišta parnog kotla sa prinudnom cirkulacijom" in FME Transactions, 36, no. 1 (2008):9-19, https://hdl.handle.net/21.15107/rcub_machinery_791 .