Fireside Corrosion of Applied and Modern Superheater-alloys Under Oxy-fuel Conditions

Stein-Brzozowska, Gosia; Maier, Jörg; Scheffknecht, Günter; Cumbo, Danila; Masci, Silvia; Enrico, Tosi; Corraggio, Giovanni; Faleni, M.; Biasci, L

doi:10.1016/j.egypro.2013.06.020

Cited by 9 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the past decade, there has been increasing research work studying the corrosion of such superalloys intended for use in USC boilers. Most of these works are laboratory-scale studies where corrosion of alloys designed for use in USC coal boilers like Inconel 740 and austenitic steels has been studied under an artificial coal boiler environment created using synthetic coal ash and SO 2 -containing combustion gas. ,,− In addition to laboratory tests, there are studies where the alloy sample is exposed to a corrosive environment in a coal-fired power plant . Stein-Brzozowska et al exposed nickel-based alloys (alloys 263, 617, and 740) in the superheater region of coal-fired power plants.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Monitoring in Boilers Using a Nonlinear Estimator and Electrochemical Noise-Based Corrosion Sensors

Somayajula,

Bhattacharyya,

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A kinetic model is developed to calculate the thickness of the corrosion scale formed due to hot corrosion in the waterwall section of a boiler in coal-fired power plants. The proposed model is validated by using the data collected from an operating industrial boiler and using a novel electrochemical noisebased corrosion sensor. As corrosion dynamics are significantly slow compared to the dynamics of temperature and gaseous species concentration, a multiscale model is developed where datadriven models are developed for algebraic states that affect the corrosion rate. The novel corrosion sensors can be costly and may be infeasible to place at all locations, especially due to the high temperature and harsh operating conditions in the waterwall section. This paper investigates opportunities for corrosion estimation by placing sensors for the algebraic state variables, the measurement of which is comparatively more mature and considerably cheaper than that of the corrosion sensors. To this end, a nonlinear estimator is investigated. Unlike many systems that are represented by differential-only or differential algebraic equations, in this particular system, differential equations do not affect the algebraic states but the algebraic states affect the differential states. For nonlinear state estimation of this specific class of differential algebraic equation system, a modified unscented Kalman filter algorithm is developed. The performance of the estimation algorithm is evaluated with different configurations of the sensor network by simulating the boiler with various operating conditions, as expected during load-following operation.

show abstract

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Monitoring in Boilers Using a Nonlinear Estimator and Electrochemical Noise-Based Corrosion Sensors

Somayajula,

Bhattacharyya,

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Some scholars have also analyzed the effect of sulfide on the corrosion of metal surfaces from a biological perspective [22]. In addition, the surface temperature of the heat exchanger has a great influence on the corrosion rate of the heat exchanger [16,19,[23][24][25][26] and previous deposit accumulation called corrosion history can impact the future corrosion attack [27]. Corrosion and fouling of the heat exchanger not only reduce the efficiency of heat transfer, but also increase the temperature of flue gas and energy consumption, which then results in safety accidents and economic loss [28].…”

Section: Introductionmentioning

confidence: 99%

Fireside Corrosion on Heat Exchanger Surfaces and Its Effect on the Performance of Gas-Fired Instantaneous Water Heaters

Huang

Sun

Kang³

2019

Energies

View full text Add to dashboard Cite

The heat exchanger in a gas instantaneous water heater is a thermal device used for heat transfer from the high-temperature flue gas to the low-temperature water. The fireside corrosion, due to the reaction of acidic condensate formed on the heat exchanger surfaces and its metallic material, is one of the major hazards for gas instantaneous water heaters. This paper focuses on identifying and quantifying the fireside corrosion on the surface of heat exchangers in gas-fired instantaneous water heaters. Durability tests lasting for 2000 cycles were undertaken for five gas-fired instantaneous water heaters, which were different in terms of the heat input and coating of heat exchangers. The corrosion deposits on the surface of the heat exchangers were surveyed by several methods. The results show that the corrosion deposit grew as the test duration increased. The fins of the heat exchanger with a lead coating had been corroded and copper was exposed. Cu4(OH)6SO4 was the main corrosion product of heat exchangers without a lead coating, whereas PbSO4 was the main corrosion product of heat exchangers with a lead coating. The experiments demonstrate that the corrosion rate decreased with the increase of the heat input. The experiments also show that the thermal efficiency of gas instantaneous water heaters decreased by 2.4% to 6% at the end of the test duration.

show abstract

“…Also, the Institute of Combustion and Power Plant Technology (IFK) has performed some interesting works about the corrosion behaviors of alloys under oxy-fuel combustion in a 3 MW test facility. 8 Furthermore, the most near-commercial oxy-fuel project was operated at Schwarze Pumpe. Vattenfall Europe built a 30 MW oxy-fuel pilot facility at Schwarze Pumpe Power Station, and the first tonne of CO 2 was purified and separated in September 2008.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the International Flame Research Foundation (IFRF, Ijmuiden, Netherlands) performed the oxy-fuel combustion in an existing 2.5 MW boiler and compared the furnace performance to the air combustion technique. Also, the Institute of Combustion and Power Plant Technology (IFK) has performed some interesting works about the corrosion behaviors of alloys under oxy-fuel combustion in a 3 MW test facility . Furthermore, the most near-commercial oxy-fuel project was operated at Schwarze Pumpe.…”

Section: Introductionmentioning

confidence: 99%

NO Emissions from Oxidizer-Staged Combustion of Superfine Pulverized Coal in the O₂/CO₂ Atmosphere

et al. 2014

View full text Add to dashboard Cite

The CO 2 control technologies have been studied extensively in recent years, among which the oxy-fuel combustion shows a vast number of advantages to be explored commercially in the near future. However, unexpected problems, such as bad combustion characteristics and serious slagging and depositing issues, show up with the replacement of N 2 by CO 2 . These inherent disadvantages in normal O 2 /CO 2 combustion can be restrained via combining the superfine pulverized coal and oxy-fuel combustion technology. The axial NO emission characteristics of this new technology were focused here. The effects of the oxidizer staging were also studied in detail. Results indicate that the axial NO emissions of the unstaged O 2 /CO 2 combustion basically showed "M" type of distributions along the furnace. The "M" type can be divided into the main homogeneous and heterogeneous reaction zones. The oxidizer-staged O 2 /CO 2 combustion can mitigate NO emissions effectively. Coals with smaller particle sizes and higher volatiles are more advantageous for eliminating NO in the staged O 2 /CO 2 combustion technology. The superfine pulverized coal used with certain low NO combustion technologies shows significant superiority in both combustion performance and NO abatement.

show abstract

Fireside Corrosion of Applied and Modern Superheater-alloys Under Oxy-fuel Conditions

Cited by 9 publications

References 7 publications

Hot Corrosion Monitoring in Boilers Using a Nonlinear Estimator and Electrochemical Noise-Based Corrosion Sensors

Hot Corrosion Monitoring in Boilers Using a Nonlinear Estimator and Electrochemical Noise-Based Corrosion Sensors

Fireside Corrosion on Heat Exchanger Surfaces and Its Effect on the Performance of Gas-Fired Instantaneous Water Heaters

NO Emissions from Oxidizer-Staged Combustion of Superfine Pulverized Coal in the O₂/CO₂ Atmosphere

Contact Info

Product

Resources

About

Fireside Corrosion of Applied and Modern Superheater-alloys Under Oxy-fuel Conditions

Cited by 9 publications

References 7 publications

Hot Corrosion Monitoring in Boilers Using a Nonlinear Estimator and Electrochemical Noise-Based Corrosion Sensors

Hot Corrosion Monitoring in Boilers Using a Nonlinear Estimator and Electrochemical Noise-Based Corrosion Sensors

Fireside Corrosion on Heat Exchanger Surfaces and Its Effect on the Performance of Gas-Fired Instantaneous Water Heaters

NO Emissions from Oxidizer-Staged Combustion of Superfine Pulverized Coal in the O2/CO2 Atmosphere

Contact Info

Product

Resources

About

NO Emissions from Oxidizer-Staged Combustion of Superfine Pulverized Coal in the O₂/CO₂ Atmosphere