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Flue gas

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001164
EISBN: 978-1-62708-227-3
... sulfur, mainly from the flue gas, and calcium and chlorine, mainly from the sea water. The gray corrosion product was interspersed with rust and a black carbonaceous deposit. Corrosion pitting and poor weld penetration, with carbide precipitation and heavy etching at grain boundaries, indicated...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001087
EISBN: 978-1-62708-214-3
... Abstract The repeated failure of rubber-covered rotors and volute liners in a flue gas desulfurization system after conversion from lime slurry reagent to limestone slurry reagent was investigated. The pump was a horizontal 50 x 65 mm (2 x 2.5 in.) Galiger pump with a split cast iron case...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001324
EISBN: 978-1-62708-215-0
... Abstract A type 430Ti stainless steel flue gas expansion joint cracked because of caustic-induced stress-corrosion cracking. Energy-dispersive X-ray spectroscope analysis of the fracture surface deposits revealed the presence of sodium and potassium—caustics in hydroxide form. Primary fracture...
Image
Published: 30 August 2021
Fig. 28 Thick layer of ash and flue gas species deposited on Corten heating element surface. (a–c) Underdeposit pitting after removal of the deposited layer shown in the image. Image (b) is at a higher magnification. Source: Ref 10 More
Image
Published: 30 August 2021
Fig. 58 Suggested minimum metal temperatures to avoid flue-gas corrosion in economizers and air heaters plotted as a function of as-fired sulfur contents of various fuels More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001322
EISBN: 978-1-62708-215-0
... was hydrogen-induced. The hydrogen was probably generated by the steam-iron reaction. The source of steam on the flue gas side could be traced to a cracked fillet weld in the boiler The failure mode was unusual in that the attack was found to originate from the flue gas side of the tube rather than the steam...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001616
EISBN: 978-1-62708-229-7
... Abstract Severe pitting corrosion of a carbon steel tube was observed in the air preheater of a power plant, which runs on rice straw firing. Approximately 1450 tubes were removed from Stage 3 of the preheater (air inlet and flue gas outlet) due to corrosion and local bursting. Samples from...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001346
EISBN: 978-1-62708-215-0
... as well as restriction to movement. Fatigue cracks initiated intergranularly from both the flue gas and steam sides. Enhanced general and grain boundary oxidation coupled with age hardening of the alloy led to the formation of incipient intergranular cracks that acted as sites for the initiation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0091330
EISBN: 978-1-62708-234-1
... Abstract At a power plant, C-276 nickel alloy welds (N10276) on a C-276 duct floor completely disappeared in less than half a year. A continuous supply of flue gas came in contact with the closed bypass duct. The unscrubbed combustion products condensed on the cold duct, then the closed damper...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001590
EISBN: 978-1-62708-228-0
... The HTCR is a tubular reformer with bayonet tubes. A number of reformer tubes are placed in a tube sheet at the top of a vertical shell. A concentric flue gas tube surrounds each reformer tube. A schematic layout of the HTCR is shown in Fig. 1 . Fig. 1 Schematic layout of the HTCR...
Image
Published: 01 December 1993
Fig. 4 Micrographs of cross sections from the tube of Unit 1 showing: (a) oxidation of the flue gas side with intergranular and transgranular penetration; (b) intergranular oxidation on the steam side; and (c) transgranular crack originating from the gas More
Image
Published: 01 December 1993
Fig. 5 Micrographs of cross section from the tube of Unit 2 showing: (a) transgranular crack originating from near the base of a weld; (b) incipient intergranular and transgranular fissuring on the steam side; and (c) intergranular fissuring on the flue gas side More
Image
Published: 01 December 1993
) . Direction of crack propagation is from the steam side (bottom of micrographs) to the flue gas side of the More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001816
EISBN: 978-1-62708-180-1
... and the heating of steam in a superheater or reheater. The heat-flow path through a clean boiler tube has three components. First, fire-side heat transfer from the flame or hot flue gases is by both radiation and convection. Radiation predominates in the furnace, where the gas temperatures may be close to 1650 °C...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006825
EISBN: 978-1-62708-329-4
... radiation and convection. Radiation predominates in the furnace, where the gas temperatures may be close to 1650 °C (3000 °F). By the time the flue gas has left the furnace, it has been cooled to 925 to 1095 °C (1700 to 2000 °F), and convection is the predominant mode of heat transfer. Second, conduction...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001341
EISBN: 978-1-62708-215-0
.... The tubes exhibited distortion with scale and deposits on the exterior surfaces. Operations reported lower flue gas temperatures for this unit compared to the replacement unit. Selection of Specimens Four tube bends, including the three bends that failed and one bend remote from the failure area...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0047615
EISBN: 978-1-62708-230-3
... smaller cracks. 45x. All as-polished Discussion A general review of the stresses in the tube fin area indicated that failure was most probably due to thermal stress from differential expansion of the fin and tube. Specifically, the outside of the fin approaches the temperature of the flue gas...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001834
EISBN: 978-1-62708-241-9
... external corrosion results from tube metal temperature, corrosive flue gas, and surface deposits [ 10 ]. The oxygen content of the steam vapor in the tube was low (0.007–0.030 mg/L). Thus, the corrosion of the pipe, particularly through water steam oxidation, can be considered a hypoxic process...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001233
EISBN: 978-1-62708-232-7
... Sulfurization X10CrAl 7 Fe-0.37C-26Cr Fe-0.29C-26Cr High-temperature corrosion and oxidation Pipes 42.25 × 3.25 mm from a blast furnace gas fired recuperator for the preheating of air were heavily oxidized and perforated in places. Depending on the load the temperature of the combustion gas in the flue...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001826
EISBN: 978-1-62708-241-9
... to the furnace fire from one side (temperature: 1250 °C) and the outgoing flue gases on the other side (temperature: 400 °C). The leakage was on the down stream side of the tube facing the furnace. The failed tube length covered was about 1.8 m with eight ruptured opening (punch mark). Each punch mark had multi...