Alkali removal at 1400 °C under gasification conditions

Waindich, Arleta; Müller, Michael

doi:10.1016/j.fuel.2013.03.008

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…It should be noted that the majority of the research on the release of alkali metals in different forms is based on qualitative calculations. Some studies also that quantitatively determined the released of alkali metals through online testing methods, such as LIBS (laser-induced breakdown spectroscopy) − and MBMS (molecular beam mass spectrometer). − …”

Section: Fireside Corrosion On Heat Transfer Tubesmentioning

confidence: 99%

Application of Coatings to Alleviate Fireside Corrosion on Heat Transfer Tubes during the Combustion of Low-Grade Solid Fuels: A Review

et al. 2020

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To address the energy and environmental issues related to the use of traditional fossil fuels, the thermal utilization of low-grade solid fuels such as low-rank coal, biomass, and municipal solid waste has gradually attracted much attention. During the combustion of the low-grade solid fuels, one of the major operation problems is the fireside corrosion on heat transfer tubes, which easily causes the frequent replacement of tubes and shutdown of boilers, largely reducing the energy and economic performances. In this review, the causes and mechanisms of corrosion were first clarified to provide a basis for mitigating the losses induced by the fireside corrosion, followed by the introduction of the preparation and properties of coatings, which show great potential to resist the invasion of corrosive species by attaching the reinforced surface to the tubes. To demonstrate the feasibility of the coating for hightemperature corrosion resistance, 94 kinds of coatings in more than 60 literature contributions were statistically analyzed. It was found that over 90% of anticorrosion coatings were prepared from thermal spraying techniques, and approximately three-quarters of the anticorrosion coatings were made of NiCr-based alloys. Many methods were reported to evaluate the corrosion resistance of coatings in literature, including mass gain/loss method, ash deposition method, contact angle method, and ash adhesion method. As for exploring the anticorrosion mechanisms of coatings, it was found that the protection was achieved by the formation of dense oxide scale, such as Cr 2 O 3 , NiO, MoO 2 , and so on. Furthermore, the application status of coatings in power plants was also summarized. According to the pilot-scale tests listed in literature, the obvious similarity is that the adopted technologies were mainly High velocity oxy-fuel (HVOF) spraying or cold spraying techniques, with almost all of the coated materials being NiCr-based alloys as well as a small portion of Fe/Co-based alloys. This indicates that the NiCr-based coatings prepared by HVOF spraying technique have been widely applied in power plants. In order to promote the large-scale application of anticorrosion coatings, it is prospective to focus on several key research aspects: (1) predicting the corrosion conditions from fuel compositions, (2) developing costeffective coatings, (3) establishing the systematic evaluation methods by laboratory tests, (4) achieving in-depth understanding of the anticorrosion mechanisms, and (5) conducting a comprehensive economic analysis.

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Section: Fireside Corrosion On Heat Transfer Tubesmentioning

confidence: 99%

Application of Coatings to Alleviate Fireside Corrosion on Heat Transfer Tubes during the Combustion of Low-Grade Solid Fuels: A Review

et al. 2020

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“…Weindlich and Müller reviewed a wide variety of potential sorbents including bauxite, kaolin, and sand. They concluded that kaolin with an Al 2 O 3 /SiO 2 ratio between 1/5 and 1/3 was an effective sorbent for reducing alkali metal chlorides to below 100 ppbv . The sorbent can then be extracted from the gas on a high temperature ceramic filter.…”

Section: Gasification Research and Developmentmentioning

confidence: 99%

Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

Higman¹,

2013

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“…High‐temperature gas cleaning processes are necessary to increase the efficiency of future power plants. Getter materials, such as kaolinite, are able to capture gaseous alkali compounds by sorption at high temperatures and reduce the concentration to a noncritical level .…”

Section: Introductionmentioning

confidence: 99%

The Reaction Kinetics of Gaseous Alkali Capture by Kaolin in Syngas Atmosphere

Kerscher¹,

Stetka²,

Spliethoff

2018

Chem Eng & Technol

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Alumosilicate minerals are suitable sorbents at high temperatures for removing alkalis in syngas. Thermogravimetric investigations of these sorbents usually focus on the reaction mechanisms. Herein, a crucible arrangement is described that allows evaporation of the alkali source and sorption of gaseous alkali components in one temperature zone. With this experimental setup, kinetic investigations of alkali sorption are possible in a conventional thermobalance. Experiments were performed with sodium chloride as the alkali source and kaolin as the getter material. The reaction rate increased with alkali concentration and showed an exponential dependence on temperature. Thus, the Arrhenius model approach and power law model were selected for mathematical description.

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Alkali removal at 1400 °C under gasification conditions

Cited by 10 publications

References 7 publications

Application of Coatings to Alleviate Fireside Corrosion on Heat Transfer Tubes during the Combustion of Low-Grade Solid Fuels: A Review

Application of Coatings to Alleviate Fireside Corrosion on Heat Transfer Tubes during the Combustion of Low-Grade Solid Fuels: A Review

Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

The Reaction Kinetics of Gaseous Alkali Capture by Kaolin in Syngas Atmosphere

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