Development of High Performance Corrosion Test Method under Thermal Gradient in Waste Incineration Environment.

Kawahara, Yuuzou; Kira, Masaharu; Ike, Minoru

doi:10.2320/materia.39.75

Cited by 2 publications

(2 citation statements)

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“…3) In the present test, the same morphology of localized corrosion observed in actual superheater occurred even without the presence of any corrosive deposits. This type of localized corrosion has been observed at low metal temperatures of approximately 300 8C in actual superheater in which the diffusion of alloying elements is very low [6]. Therefore, it is clear that the localized corrosion was not caused by molten salts or material factors such as boundary diffusion.…”

Section: Introductionmentioning

confidence: 75%

Evaluation of high‐temperature corrosion life using temperature gradient corrosion test with thermal cycle component in waste combustion environments

Kawahara

2006

Materials & Corrosion

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In energy conversion facilities such as boilers and pyrolysis reactors that burn waste, fossil fuel, biomass and other materials, many corrosion factors, such as gas temperature and fluctuations in gas temperature, the condition of deposits, and gas composition, influence the high-temperature corrosion rate of materials in a complex manner. In order to evaluate the corrosion behavior and corrosion life time of materials rapidly and accurately, a temperature gradient corrosion test (TGT) was developed and applied to waste incineration environments.The TGT with thermal cycle was carried out without corrosive deposits in order to investigate the basic effect of gas temperature and fluctuation on corrosion behavior, especially in terms of the stability of protective oxide layers. As a result, it was clarified that gas temperature enhances the environmental factors such as the deposition rate of ash and penetration of corrosive species, while thermal cycle mainly enhances material factors such as the breakdown of protective scales.Furthermore, three application case studies of TGTs for corrosion life estimation were carried out with a comparison between TGT and field corrosion data. From these studies, a good correspondence of corrosion rates between TGTs and field tests was obtained. This correspondence of corrosion rate was explained by the breakdown of the protective oxide layer and the penetration of corrosive species in a corrosion front.The reproducibility and applicability of TGTs in the evaluation of the corrosion life time of materials were clarified based on the consideration of various corrosion mechanisms.

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Section: Introductionmentioning

confidence: 75%

Evaluation of high‐temperature corrosion life using temperature gradient corrosion test with thermal cycle component in waste combustion environments

Kawahara

2006

Materials & Corrosion

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“…The effect of flue gas is clearly observed from the temperature measurements, where the partially shielded loops have a higher temperature than the fully shielded loops. Thermal gradient laboratory experiments have clearly illustrated that the flue gas temperature is an important factor for deposit corrosion [25,26]. From the Maribo Sakskøbing data, a preferential corrosion on flue gas direction of the tube is observed but only on superheater 3.…”

Section: Effect Of Flue Gas Temperaturementioning

confidence: 99%

Experiences with high temperature corrosion at straw‐firing power plants in Denmark

Montgomery¹,

Jensen²,

Borg³

et al. 2011

Materials & Corrosion

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By the end of 2009, there will be eight biomass and five biomass co‐firing plants in Denmark. Due to the steep increase of corrosion rate with respect to temperature in biomass plants, it is not viable to have similar steam data as fossil fuel plants. Thus for the newer plants, Maribo Sakskøbing, Avedøre 2 biomass boiler, Fyn 8 and Amager 1 (Fyn 8 and Amager 1 are under commissioning), the steam temperature of the final superheaters are approximately 540 °C and the steel type used is an 18–10 stainless steel, (TP347H). However there is still a need to monitor corrosion rates, and to collate data to enable better lifetime prediction of vulnerable components in straw‐firing plants since the corrosion rates are so much faster than in coal firing plants. Therefore, there are continued investigations in recently commissioned plants with test tubes installed into actual superheaters. In addition temperature is measured on the specific tube loops where there are test tube sections. Thus a corrosion rate can be coupled to a temperature histogram. This is important since although a superheater has a defined steam outlet temperature, there is variation in the tube bundle due to variations of heat flux from the flue gas. This paper will describe the corrosion investigations for tube sections removed from Maribo Sakskøbing and Avedøre 2 biomass boiler which have been exposed for up to 30 000 h. In addition to monitoring the corrosion rates of actual components, there is a need to measure corrosion rates at higher temperatures to assess if there is a possibility to increase the outlet temperature of the plant, thus making the plant more cost effective. For this purpose Avedøre 2 biomass boiler has a test superheater loop fabricated in TP347H FG (the same material as the final superheaters). Some results from this test superheater will also be described. Effects of flue gas temperature and flue gas direction on corrosion rates are also discussed.

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Development of High Performance Corrosion Test Method under Thermal Gradient in Waste Incineration Environment.

Cited by 2 publications

References 0 publications

Evaluation of high‐temperature corrosion life using temperature gradient corrosion test with thermal cycle component in waste combustion environments

Evaluation of high‐temperature corrosion life using temperature gradient corrosion test with thermal cycle component in waste combustion environments

Experiences with high temperature corrosion at straw‐firing power plants in Denmark

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