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Flue gases

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Published: 01 June 2019
Fig. 1 Schematic of the air preheater showing the different stages and the direction of air and flue gases (note the part of the outer shield is shown in open to reveal the pipes) More
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
... and brownish black scales and is featured by three punch marks. The other side of the riser boiler tube facing the out going flue gases is covered with thick scales having greenish tint but did not show any failure. The magnified view of the sections of the boiler tube covering the punch mark and marked...
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
... and flue gases (note the part of the outer shield is shown in open to reveal the pipes) The corrosion was not uniform on all the tubes and stages in the preheater. Approximately 1450 tubes were removed from Stage 3 (front end) for study and replacement ( Fig. 2a ). Two tubes from each stage (Stage 2...
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
..., the carbon acting as a cathode, and alloy susceptibility to intergranular corrosion contributed to the corrosion. Corrosion products Flue gases Sulfates Incoloy 825 UNS N08825 Intergranular corrosion Pitting corrosion The inlet foot ( Figs. 1 and 2 ) was part of a fire prevention inert gas...
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
... embrittlement Flue gases 430Ti Brittle fracture Stress-corrosion cracking Visual Examination of General Physical Features The flue gas expansion joint sample was examined using a low-power binocular microscope, and it was photographed in the as-received condition. Figure 1 shows the expansion...
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
..., the heat input from the combustion of fuel is balanced by the formation of steam in the water-wall tubes, followed by heating of steam in a superheater or reheater. The heat-flow path through a clean boiler tube has three components. First, fireside heat transfer from the flame or hot flue gases is by both...
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
... located near the header ends and in the first tube row where the flue gases are hottest. Pertinent Specifications The first two rows of tubes on the upstream side of the flue duct were bare 38.1-mm (1.5-in.) diameter Schedule 40 SB 407 alloy 800H pipe. The remaining rows of downstream tubes...
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 Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
... flushing can be used. Some of the newest designs of mechanical seals for abrasive service are even axially split for ease of replacement. Another example of abrasive erosion is the impact of fly ash entrained in the flue gases in screen tubes or superheater tubes of boiler systems. Erosion is enhanced...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... example of abrasive erosion is the impact of fly ash entrained in the flue gases in screen tubes or superheater tubes of boiler systems ( Ref 91 ). Erosion is enhanced by high flow velocities; thus, partial fouling of gas passages in tube bands by deposition of fly ash can lead to erosion by forcing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001149
EISBN: 978-1-62708-232-7
... increased, the temperature differences and thermal bending also increased. Because of the thermal bending, saddle support holddown bolts began breaking in February. The nonuniform temperatures were caused by several factors including flue gas impingement, weather conditions, nonuniform heat convection from...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... and changing the casting technique to eliminate the columnar grain structure would reduce the stress and make the design more tolerant of corrosion. Chloridation Chlorides accumulate rapidly on metallic surfaces of test samples. Typical deposits contained 21 to 27% Cl when the flue gas contained 40...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... to the formation of volatile metal chlorides. If conditions permit, evaporative weight loss can occur due to the high vapor pressures of iron and chromium chlorides. Chlorides accumulate rapidly on metallic surfaces from burning plastic waste. Typical deposits contain 21 to 27% Cl when the flue gas contains 40...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003503
EISBN: 978-1-62708-180-1
... as inputs and produces hot water as an output; flue gases and heat leakage are also produced as waste outputs. The water temperature is regulated by the controller opening and closing the main gas valve (labeled stop valve) when the temperature of the water in the tank goes outside the preset limits of 60...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006813
EISBN: 978-1-62708-329-4
... exchangers are used to transfer heat from/to combustion gases and steam or water to/from gases, vapors, or liquids of various types where, for example, the effluent is used to heat the incoming stream or external water cools the reactant steam. A great variety of heat-exchanger designs have been used...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... preparation (mill scale, coatings surface finish, etc.), environmental composition (trace contaminants, dissolved gases, etc.), temperature, flow rate, solution concentration, and degree of agitation or aeration. In addition, corrosion product films and other changes in surface composition can also occur...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
.... This includes material composition, heat treatment, surface preparation (mill scale, coatings, surface finish, etc.), environmental composition (trace contaminants, dissolved gases, etc.), temperature, flow rate, solution concentration, and degree of agitation or aeration. In addition, corrosion product films...