Failure analysis of air preheater tubes in a circulating fluidized bed boiler

Suwarno, Suwarno; Nugroho, Gunawan; Santoso, Ari; Witantyo,

doi:10.1016/j.engfailanal.2021.105380

Cited by 5 publications

(7 citation statements)

References 22 publications

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“…This micro photo corresponded to the microstructure of the benchmark tube that had a microstructure of cracks in the transverse and rolling directions indicating a failure of the microstructure, compared to the coated benchmark tube. Some differences in damage were clearly visible [ 20 ]. The cracked and unstable passivation film ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This caused changes in the microstructure of the boiler tube. Changes in the microstructure, hardness, and corrosion rate of the tube coating indicated other causes, namely that the failures that occurred were not only due to differences in carbide composition but also due to contamination with corrosive residues for a long time, and the location of the pipe damage was dominated by the oxygen element content [ 20 ]. In addition, there was also friction and adhesion between the pipe and the fluid.…”

Section: Resultsmentioning

confidence: 99%

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Failures analysis of tube coating in Circulating Fluidized Bed (CFB) boiler

Widjajanto,

Darmadi,

Irawan

et al. 2024

Heliyon

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Failures analysis of tube coating in Circulating Fluidized Bed (CFB) boiler

Widjajanto,

Darmadi,

Irawan

et al. 2024

Heliyon

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“…The energy requirement to produce 1 kWh of gross electricity is the meaning of GPHR, while the energy requirement to produce 1 kWh of net electricity is the definition of NPHR. Calculation of plant heat rate uses 2 methods, namely the inputoutput method and the energy balance method (Suwarno et al, 2021).…”

Section: Plant Heat Rate Analysismentioning

confidence: 99%

“…The water heater in the CFB boiler is divided into two, namely the primary air heater and the secondary air heater. The primary air heater supplies air to the wind box for the particle bed (fluidizing) bubbling process, while the secondary air heater supplies combustion air in the lower furnace area (Suwarno et al, 2021).The air heater is in the backpass area and undergoes a heat transfer process through the wall of the air heater tube. The calculation of the heat transfer rate in the tube air heater is based on the tube material, the dimensions and thickness of the material, and the temperature difference (Basu, 2015).…”

Section: Introductionmentioning

confidence: 99%

Performance analysis and techno economy of post overhaul circulating fluidized bed boiler PLTU

Amin¹,

Sulardjaka²,

Saptadi³

2023

ijecs

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All countries in the world have a high dependence on energy. Predictions of energy demand continue to increase in all countries, so savings measures are needed. One of the saving measures in the power generation industry is an overhaul. An overhaul is a maintenance activity that must be carried out periodically to maintain the NPHR performance of the power plant as it was when the initial conditions were built. This study aims to (1) determine the performance of the power plant before and after overhaul, (2) determine how the PLTU performs at 50%, 75%, and 100% load, and (3) analyze the techno-economics of overhaul activities with a serious type inspection. The results of this study explain that the three treatments of the post-overhaul loading pattern have a good impact on the PLTU, namely in the form of a decrease in the NPHR after the overhaul work. The impact of the reduced post-overhaul NPHR value at this PLTU is that it can save fuel costs of 17.5 billion rupiah per year. The cost for this overhaul work is 14.9 billion rupiah so in 1 year it can save around 2.6 billion rupiah.

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“…The sulfur trioxide (SO3) that is formed with water vapor in the flue gas will form sulfuric acid, causing condensation on the surface of heat exchanger tubes. Cold-end corrosion depends on the concentration of sulfuric acid and the surface temperature of the tubes [10], [11].…”

Section: Figure 1 Tubular Air Preheatermentioning

confidence: 99%

The Influence of Tube Thickness on the Shell Side of the Air preheater As a Form of Corrosion Prevention

Ulyasa,

Slameto,

Widarti

2023

fld

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Air preheater as a heat recovery technology is generally applied in the powerplant industry and used to heat combustion air, which increases the efficiency of the combustion chamber in the boiler. In this case, air preheater has tubular recuperative type typically located at the bottom of the circulating fluidized boiler for utilizing the lowest temperature exhaust gas. A significant presence of SO2 in the exhaust gas can lead to cold-end corrosion and cause leaks. The low tube thickness in the air preheater provides a good heat transfer performance unfortunately the corrosion issue has not been considered. By increasing the tube thickness, its aimed to extend the life time of the tubes with good corrosion resistance. This study is performed with calculations using empirical equations and validated results using Heat Transfer Research Inc (HTRI) software. Increasing the tube thickness impacts decreasing the heat transfer coefficient, increasing the flue gas (shell) pressure drop, and increasing the fouling factor. The tube thickness which determined for the corrosion prevention design of the air preheater give an overdesign of 18.14%, a heat transfer rate coefficient of 1.726 Btu/hr. ft2. °F, a shell pressure drop of 0.000541 psi, and a fouling factor of 0.114 hr. ft2. °F/Btu.

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Failure analysis of air preheater tubes in a circulating fluidized bed boiler

Cited by 5 publications

References 22 publications

Failures analysis of tube coating in Circulating Fluidized Bed (CFB) boiler

Failures analysis of tube coating in Circulating Fluidized Bed (CFB) boiler

Performance analysis and techno economy of post overhaul circulating fluidized bed boiler PLTU

The Influence of Tube Thickness on the Shell Side of the Air preheater As a Form of Corrosion Prevention

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