Application of an empirical model in CFD simulations to predict the local high temperature corrosion potential in biomass fired boilers

Gruber, Tobias; Scharler, Robert; Obernberger, Ingwald

doi:10.1016/j.biombioe.2015.02.024

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…The presence of chlorine also assists in the transfer of alkali metals from the fuel to the furnace surfaces as chlorides. Gruber et al (2015) measured the high temperature corrosion rate of various types of wood combustion in a 50 kW grate furnace, and correlated this rate exponentially with the FG temperature and linearly with FG velocity and the boiler steel pipes temperature. However, with the pulverized fuel combustion, caution must be applied due to the difference in the fuel particle size, fuel transport with the primary air, and the full process design.…”

Section: Introductionmentioning

confidence: 99%

Effect of oxy-fuel combustion on ash deposition of pulverized wood pellets

et al. 2019

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HIGHLIGHTS Deposition tendencies of wood pellets are predicted by the ash stream compositions. Wood pellets have a low tendency for slagging and high tendency for fouling. Oxy-fuel combustion reduces slagging yet increases fouling tendencies of alkali sulphates. Oxy-fuel combustion can reduce the propensity of high-temperature corrosion problems. Ash behaviour of wood pellets is significantly changed when replacing air-fuel with oxy-fuel conditions.

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Section: Introductionmentioning

confidence: 99%

Effect of oxy-fuel combustion on ash deposition of pulverized wood pellets

et al. 2019

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“…The formation of a partially or completely molten layer in the outer, hotter region closer to the flue gas was also observed in the experiments, and the presence of a molten phase at the alloy/deposit interface indicated that severe corrosion had occurred. To study the high-temperature corrosion performance of boiler steels, several new technologies have been adopted, such as electrochemical noise techniques and an online corrosion probe measurement device, which measures the resistance between the steel surface and the formed ionic layer and relates the measured signal to the corrosion rate to qualitatively describe the steel loss over time. , Uusitalo et al performed high-temperature corrosion tests on ferritic steel and austenitic stainless steel with various coatings or no coating, and the results indicated that the corrosive attack proceeded through the formation of alkali chromate and was severe as a result of active oxidation. Decreasing the steam temperature may be an effective countermeasure, but it reduces the electrical efficiency of the power plant.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Corrosion Properties of Boiler Steels under a Simulated High-Chlorine Coal-Firing Atmosphere

et al. 2017

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High-temperature corrosion of the superheater and reheater tubes in utility boilers frequently occurs upon firing high-chlorine coal, which severely impacts the safety of the boiler operation. In this work, the corrosion mechanism of several commonly used boiler steels, including T91, 12Cr1MoVG, and TP347H, was investigated. First, the types and amounts of the main corrosive elements in the flue gas and the heating surface deposits from high-and low-chlorine coals were predicted with the aid of thermodynamic equilibrium modeling. The main corrosive elements that vaporized and subsequently condensed from the flue gas were determined to be Na, Cl, and S. Varying the wall temperature of the heating surface did not dramatically change the forms of these elements but slightly influenced their amounts. Second, lab-scale experiments were conducted in a tube furnace to estimate the degree of corrosion of various boiler steels under simulated conditions upon firing high-and low-chlorine coals. A sophisticated wall temperature control method was employed to account for the influence of different heating tube surface temperatures (560 and 610 °C) on corrosion at the same simulated flue gas temperature (950 °C) around the tube. The results show that more severe material degradation is caused by firing high-chlorine coal together with a higher tube wall temperature and the resistance to corrosion was highest for the austenitic steel TP347H, which had the highest chromium and nickel contents.

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“…At the exit of the drop tube the measurement ports for the online corrosion probe and the mass loss probe are located. A more detailed description of the experimental facility is given in [1,9].…”

Section: Biomass Test Rigmentioning

confidence: 99%