Superheater Corrosion In Biomass Boilers: Today's Science and Technology

Sharp, William B.

doi:10.2172/1048711

Cited by 10 publications

(6 citation statements)

References 89 publications

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“…If these steps are not sufficient or applicable, economizer tubes can be coated with corrosion-resistant materials (e.g., thermally sprayed high-velocity oxy-fuel coatings). 26…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Corrosion in Biomass Boilers Fired with Chemically Untreated Wood Chips and Bark

2015

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Low-temperature corrosion often causes failures of cold-end parts (economizers, air pre-heaters, and fire tubes of hot water boilers) in biomass boilers firing chemically untreated wood chips and bark. The most relevant mechanisms causing low-temperature corrosion are condensation of acids and hygroscopic salts in the deposits on heat-exchanger surfaces. This article offers a short review on acid condensation and presents a detailed study on the formation of hygroscopic salts, which may absorb moisture from the flue gas to such an extent that they are dissolved and form highly concentrated salt solutions. Typical fuel compositions of wood chips and bark in combination with typical operating conditions of biomass grate furnaces have been used to estimate the compositions of ash deposits on heat-exchangers. Based on these compositions, thermodynamic equilibrium calculations have been conducted in the range of 70−400°C, which have revealed that the hygroscopic salts K 2 ZnCl 4 , KCaCl 3 , and CaCl 2 can be formed at these conditions. Finally, recommendations are given on how to minimize the risk for lowtemperature corrosion.

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“…If these steps are not sufficient or applicable, economizer tubes can be coated with corrosion-resistant materials (e.g., thermally sprayed high-velocity oxy-fuel coatings). 26…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Corrosion in Biomass Boilers Fired with Chemically Untreated Wood Chips and Bark

2015

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“…Biomass fuels are burned in three main types of boilers, namely, grate fired, bubbling bed, and circulating fluidized bed units. These boilers are normally operated solely to generate electricity but can also be operated to simultaneously generate a combination of heat and power [37]. It is found that there is a growing interest in the use of biofuels for energy purposes due to various reasons such as reduction in dependency on imported oil, generation of 20 times more employment, mitigation of greenhouse gases [38][39][40], and reduction of acid rain [41].…”

Section: Biofuel-fired Boilermentioning

confidence: 99%

Corrosion Problems in Incinerators and Biomass-Fuel-Fired Boilers

Mudgal

Singh

Prakash

2014

International Journal of Corrosion

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Incinerators are widely used to burn the municipal waste, biowaste, wood, straw, and biomedical waste. Combustion of these types of waste results in generation of chlorides of sodium and potassium which may attack the metallic part of the incinerator. In biofuel-fired boilers, similar type of highly corrosive environment is present. Attempt has been made to review the corrosion problems and their solutions as per the available literature.

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“…Under the high temperature, the deposit causes serious corrosion to the pipe wall [1,13,14]. These processes reduce boiler steam temperature and increase the risk of boiler shutdown [15]. Meanwhile, with the development of boiler technology, the working temperature of the boiler will become higher, which can be seen from the experiments in many related literatures that have been carried out at about 650 • C [16,17].…”

Section: Introductionmentioning

confidence: 99%

Recent Development of Corrosion Factors and Coating Applications in Biomass Firing Plants

Yuan

Liu

et al. 2020

Coatings

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Due to global warming, biomass fuels are gradually being used to replace fossil fuels. However, high-temperature biomass corrosion is a crucial issue affecting its future application. In this article, different factors affecting boiler performance are summarized from various studies to guide the optimization of boiler parameters in practical applications, such as corrosive components and boiler temperatures. Meanwhile, different coating formation methods and materials are summarized to provide better protection strategies. The potential coating materials for future research are also discussed. The addition of other elements, such as Ti, Mo, and W, has the potential to accelerate the formation of oxide layers during high-temperature corrosion and directly slow down the corrosion rate. Future studies should focus on these elements containing materials.

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Superheater Corrosion In Biomass Boilers: Today's Science and Technology

Cited by 10 publications

References 89 publications

Low-Temperature Corrosion in Biomass Boilers Fired with Chemically Untreated Wood Chips and Bark

Low-Temperature Corrosion in Biomass Boilers Fired with Chemically Untreated Wood Chips and Bark

Corrosion Problems in Incinerators and Biomass-Fuel-Fired Boilers

Recent Development of Corrosion Factors and Coating Applications in Biomass Firing Plants

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