Changes in chlorine content over time-Probe deposit sampling in a Finnish kraft recovery boiler

Article Thermodynamics

Morphological and chemical differences within superheater deposits from different locations of a black liquor recovery boiler

Roland Balint et al.

Summary: By analyzing superheater ash deposits from a kraft recovery boiler, the effects of two deposit ageing mechanisms were identified. Local differences in deposit morphology and chemical composition were observed under the electron microscope. The diffusion of alkali chloride vapours towards the steel due to temperature gradient was evident. The presented results provide a better understanding of intradepositional changes and help assess risks of deposit-related operational problems in the boiler.

ENERGY (2023)

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Article Thermodynamics

Superheater deposits and corrosion in temperature gradient - Laboratory studies into effects of flue gas composition, initial deposit structure, and exposure time

Jonne Niemi et al.

Summary: The study focuses on the evolution of ash deposit chemistry of biomass fuels under high temperature conditions, revealing how the melting behavior of alkali salt-rich deposits influences the chemistry and morphology of the deposits. The vaporization-condensation mechanism leads to the enrichment of alkali chlorides within the deposits, accelerating the corrosion process on steel surfaces.

ENERGY (2021)

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Article Thermodynamics

Temperature gradient induced changes within superheater ash deposits high in chlorine

Roland Balint et al.

Summary: This study analyzed cross-sections of kraft recovery boiler superheater deposits using scanning electron microscopy and energy dispersive X-ray analysis. The findings revealed time-dependent processes induced by temperature gradients that affect deposit morphology, with these processes being identified for the first time in actual boiler superheater deposits.

ENERGY (2021)

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Article Chemistry, Applied

Modeling ash deposit growth rates for a wide range of solid fuels in a 100 kW combustor

Seyedhassan Fakourian et al.

Summary: This study introduces a model for evaluating the ash deposition propensity of various solid fuels, incorporating four deposition mechanisms. The research shows that the newly developed MFSM model is more accurate in predicting ash deposit rate compared to the existing KESM model.

FUEL PROCESSING TECHNOLOGY (2021)

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Article Energy & Fuels