Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit
Само за регистроване кориснике
2022
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
The analysis of pressure changes in water and steam flow along the entire once-through steam
boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period
of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic
resistance was recorded in comparison to the design values in the evaporator tubes, both in
the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of
this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner
wall of tubes. The significantly increased hydraulic roughness on the inner wall of tubes was determined
on the basis of measured pressure drops at sections of the tube system and numerical calculation
performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube
flows. The model is based on the steam-water two-fluid model with mass, momentum and energy
bala...nce equations and mechanistic correlations for the steam-water interface transfer processes. The
model is suitable for the single and two-phase flow parameters prediction in the span from subcritical
to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight
in the fluid pressure, velocity and temperature change in the boiler tube system. After the long
operational period the pressure drop in evaporating tubes almost doubles in comparison to the design
values. The presented results are a support to boiler’s design, operational procedures and maintenance.
Кључне речи:
numerical simulation / two-fluid model / thermalhydraulics / tube system / steam boilerИзвор:
35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022., 2022Издавач:
- Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS)
Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200105 (Универзитет у Београду, Машински факултет) (RS-MESTD-inst-2020-200105)
Институција/група
Mašinski fakultetTY - CONF AU - Stevanović, Vladimir AU - Milivojević, Sanja AU - Petrović, Milan M. AU - Ilić, Milica PY - 2022 UR - https://machinery.mas.bg.ac.rs/handle/123456789/4511 AB - The analysis of pressure changes in water and steam flow along the entire once-through steam boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic resistance was recorded in comparison to the design values in the evaporator tubes, both in the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner wall of tubes. The significantly increased hydraulic roughness on the inner wall of tubes was determined on the basis of measured pressure drops at sections of the tube system and numerical calculation performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube flows. The model is based on the steam-water two-fluid model with mass, momentum and energy balance equations and mechanistic correlations for the steam-water interface transfer processes. The model is suitable for the single and two-phase flow parameters prediction in the span from subcritical to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight in the fluid pressure, velocity and temperature change in the boiler tube system. After the long operational period the pressure drop in evaporating tubes almost doubles in comparison to the design values. The presented results are a support to boiler’s design, operational procedures and maintenance. PB - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) C3 - 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022. T1 - Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit UR - https://hdl.handle.net/21.15107/rcub_machinery_4511 ER -
@conference{ author = "Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M. and Ilić, Milica", year = "2022", abstract = "The analysis of pressure changes in water and steam flow along the entire once-through steam boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic resistance was recorded in comparison to the design values in the evaporator tubes, both in the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner wall of tubes. The significantly increased hydraulic roughness on the inner wall of tubes was determined on the basis of measured pressure drops at sections of the tube system and numerical calculation performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube flows. The model is based on the steam-water two-fluid model with mass, momentum and energy balance equations and mechanistic correlations for the steam-water interface transfer processes. The model is suitable for the single and two-phase flow parameters prediction in the span from subcritical to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight in the fluid pressure, velocity and temperature change in the boiler tube system. After the long operational period the pressure drop in evaporating tubes almost doubles in comparison to the design values. The presented results are a support to boiler’s design, operational procedures and maintenance.", publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS)", journal = "35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022.", title = "Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit", url = "https://hdl.handle.net/21.15107/rcub_machinery_4511" }
Stevanović, V., Milivojević, S., Petrović, M. M.,& Ilić, M.. (2022). Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit. in 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022. Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS).. https://hdl.handle.net/21.15107/rcub_machinery_4511
Stevanović V, Milivojević S, Petrović MM, Ilić M. Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit. in 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022.. 2022;. https://hdl.handle.net/21.15107/rcub_machinery_4511 .
Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., Ilić, Milica, "Increased hydraulic resistance in tubes of once-through boiler due to fouling: a case study of 650 MWe ligite fired unit" in 35. Međunarodni kongres o procesnoj industriji - Procesing 2022, Beograd, Srbija, 1-2. jun 2022. (2022), https://hdl.handle.net/21.15107/rcub_machinery_4511 .