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fly ash attack

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430314
EISBN: 978-1-62708-253-2
.... It discusses the erosive effect of blowing soot, steam, and fly ash as well as coal particle impingement and falling slag. It also includes several case studies. boiler tubes coal-particle impingement falling slag fire-side erosion fly ash attack soot blowing steam cutting action Erosion...
Image
Published: 01 November 2007
Fig. 10.76 Scanning electron micrograph (backscattered electron image) showing fly-ash deposits (46.4 Si-21.6Al-20.7Fe) (marked 1) on the surface of Type 304H reheater ( Fig. 10.75 ) that suffered the maximum wastage at location 30° away from the direct flue gas impingement point. The 304H More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080235
EISBN: 978-1-62708-304-1
... that yield heavy loading of erosive ash, which is usually indicated by high silica content ( Ref 5 ). For fluidized-bed coal-fired boilers, flue gas streams are laden with not only fly-ash but also sands from the bed. The convection pass tubes in these boilers are subject to erosion attack. Waste...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430290
EISBN: 978-1-62708-253-2
.... On the other hand, the typical ingredients of oil ash formed in oil-fired boilers include elements such as sulfur, sodium, and vanadium. During fire-side corrosion, a low-melting liquid eutectic phase forms in the ash deposits, which attack the tube surface, leading to local dissolution of the protective...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430147
EISBN: 978-1-62708-253-2
...-side erosion: Soot blower erosion Fly ash erosion Coal particle erosion Falling slag erosion Erosion due to steam cutting Fatigue: Mechanical fatigue Thermal fatigue Corrosion fatigue Creep-fatigue interaction Operation failures: Failures due to operational...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080259
EISBN: 978-1-62708-304-1
... northern Wyoming, contains less than 1.2 lb of sulfur per million btu, making it compliant with Clean Air Act emissions limits without air pollution control equipment ( Ref 4 ). Ash from coal after combustion can be entrained in flue gas to cause fly-ash erosion on heat-absorbing surfaces in the lower...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.9781627083041
EISBN: 978-1-62708-304-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080335
EISBN: 978-1-62708-304-1
.... In this temperature range, there will be more chloride salts that become molten, as shown in Fig. 12.10 . This may also result in a higher concentration of molten chloride salts in the ash deposits forming on the tube surface. Presence of more chloride salts will result in more corrosion attack ( Fig. 12.9...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480331
EISBN: 978-1-62708-318-8
... and that the resistance can be extended into the “reducing-acid” region by adding a small amount of palladium. It describes how different grades of titanium respond to different forms of attack, including uniform, crevice, and galvanic corrosion. It also identifies applications where corrosion is often a concern...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030292
EISBN: 978-1-62708-282-2
... steels at temperatures between 425 and 540 °C (800 and 1000 °F) because of increased temperature resistance (i. e., strength retention). The C-0.5Mo steel was originally considered significantly more resistant than carbon steel to high-temperature hydrogen attack (HTHA). It has been extensively used...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910497
EISBN: 978-1-62708-250-1
... with soot, fly ash, and sulfur compounds as the principal constituents. inhibitor. A chemical substance or combination of substances that, when present in the environment, prevents or reduces corrosion without sig- nificant reaction with the components of the environment. intercrystalline corrosion. See...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170107
EISBN: 978-1-62708-297-6
... figures. Both at 500× In addition to the abrasion-resistant grades covered by ASTM A 532, there are other nonstandard grades used for corrosion or high-temperature service. Alloys with improved resistance to corrosion, for applications such as pumps for handling fly ash, are produced with high...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030117
EISBN: 978-1-62708-282-2
... be quite localized, as shown by the polished zones on the tube supports from a steam boiler ( Fig. 3 ). Localized fly ash-laden gas flow between the tube rows (supported on the lugs) eroded through the oxide scale and polished the metal surface beneath. Fig. 3 Erosion of a tube support by ash-laden...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060001
EISBN: 978-1-62708-261-7
... century. Five examples of this include: 1900 : Frederick Taylor and Maunsel White of Bethlehem Steel Company invented a high-impact tungsten carbide tool steel that outperformed the competition worldwide. 1903 : Orville and Wilbur Wright succeeded in flying their airplane: a wood, cloth...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910237
EISBN: 978-1-62708-250-1
... selection, and discuss, where appropriate, the characteristic forms of corrosion that attack specific materials. The materials addressed in this chapter include carbon steels, weathering steels, and alloy steels; nickel, copper, aluminum, titanium, lead, magnesium, tin, zirconium, tantalum, niobium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490183
EISBN: 978-1-62708-340-9
... corrosion Low temperature Waterwall Coal ash Oil ash Erosion Fly ash Falling slag Sootblower Coal particle Fatigue Vibration Thermal Corrosion Lack of quality control Maintenance cleaning damage Chemical excursion damage Material defects Welding defects...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.9781627083409
EISBN: 978-1-62708-340-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.9781627082532
EISBN: 978-1-62708-253-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080359
EISBN: 978-1-62708-304-1
... atmosphere converts H 2 S to SO 2 . The flue gas stream is also entrained with fly-ash particles, which include carryover of black liquor droplets and fume that is formed by condensation of volatilized inorganic salts ( Ref 15 ). These fly-ash particles deposit on the cooler surfaces of the heat-exchanger...