A thermodynamic approach on vapor-condensation of corrosive salts from flue gas on boiler tubes in waste incinerators

Ōtsuka, N.

doi:10.1016/j.corsci.2008.02.004

Cited by 60 publications

(30 citation statements)

References 6 publications

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“…Thermodynamic studies of simulated deposits [25] have shown that, for both sulfate and chlorine-based deposits, corrosion was only slight to negligible at temperature below the melting point of the deposit. For the WTE boiler, the critical melting temperature was generally considered to be 480°C.…”

Section: Influences Of Temperature On Deposits Characteristicsmentioning

confidence: 98%

Investigation of chloride deposit formation in a 24MWe waste to energy plant

Chen

Zhang

et al. 2015

Fuel

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Section: Influences Of Temperature On Deposits Characteristicsmentioning

confidence: 98%

Investigation of chloride deposit formation in a 24MWe waste to energy plant

Chen

Zhang

et al. 2015

Fuel

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“…An excep tion is observed though in the fly ash samples of the Russian coal but in general Cl was detected in very low concentrations implying its volatilization. Another published work [22] also reported that NaCl and KCl become unstable and are not found in deposits at temperatures higher than 650°C.…”

Section: Chemical Composition Analysis: Element Enrichment Icp Analysmentioning

confidence: 99%

“…Zhao et al [21] Although significant work exists studying the interactions of S/ K/Cl and their significance in fine ash and aerosol formation, explaining in detail the possible mechanisms that lead to the main ash elemental composition of fine ash and aerosols, e.g. [22,23], so far little work is reported on the possible effect of oxyfuel combus tion conditions on the elemental composition as well as the fine ash yield in comparison to conventional air firing.…”

Section: Introduction and Scope Of Workmentioning

confidence: 99%

Study on ash deposition under oxyfuel combustion of coal/biomass blends

Fryda

Sobrino

Cieplik

et al. 2010

Fuel

112

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a b s t r a c tCombustion in an O 2 /CO 2 mixture (oxyfuel) has been recognized as a promising technology for CO 2 cap ture as it produces a high CO 2 concentration flue gas. Furthermore, biofuels in general contribute to CO 2 reduction in comparison with fossil fuels as they are considered CO 2 neutral. Ash formation and deposi tion (surface fouling) behavior of coal/biomass blends under O 2 /CO 2 combustion conditions is still not extensively studied. Aim of this work is the comparative study of ash formation and deposition of selected coal/biomass blends under oxyfuel and air conditions in a lab scale pulverized coal combustor (drop tube). The fuels used were Russian and South African coals and their blends with Shea meal (cocoa). A horizontal deposition probe, equipped with thermocouples and heat transfer sensors for on line data acquisition, was placed at a fixed distance from the burner in order to simulate the ash deposition on heat transfer surfaces (e.g. water or steam tubes). Furthermore, a cascade impactor (staged filter) was used to obtain size distributed ash samples including the submicron range at the reactor exit. The deposition ratio and propensity measured for the various experimental conditions were higher in all oxyfuel cases. The SEM/EDS and ICP analyses of the deposit and cascade impactor ash samples indicate K interactions with the alumina silicates and to a smaller extend with Cl, which was all released in the gas phase, in both the oxyfuel and air combustion samples. Sulfur was depleted in both the air or oxyfuel ash deposits. S and K enrichment was detected in the fine ash stages, slightly increased under air combustion conditions. Chemical equilibrium calculations were carried out to facilitate the interpretation of the measured data; the results indicate that temperature dependence and fuels/blends ash composition are the major factors affecting gaseous compounds and ash composition rather than the combustion environment, which seems to affect the fine ash (submicron) ash composition, and the ash deposition mechanisms.

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“…Theoretical thermodynamic calculations by Otsuka [68] showed that chloride salts condense from the vapor phase form the tube deposits on superheaters and melt at relatively low temperatures. When the tube wall temperature exceeds the melting point of the chloride salts corrosion of the superheater tubes becomes more intense.…”

Section: Temperature-related Issuesmentioning

confidence: 99%