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Flue gases

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Published: 01 December 1995
Fig. 22-10 Corrosion rates of cast heat-resistant alloys in reducing flue gases More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430017
EISBN: 978-1-62708-253-2
... in a boiler house. Raw coal from this bunker is subsequently fed to the coal mill or pulverizer, which reduces it to a very fine powder (~200 mesh), so as to facilitate its complete combustion during the combustion process. A portion of the primary air is heated by means of heat from the flue gases...
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
..., and areas of economizer bends and tubes. The extent of damage due to fly ash erosion multiplies if there is a nonuniform flow of flue gases in such areas. The impact by particles of fly ash in the flue gases causes abrasive erosion of screen tubes or superheater tubes. Typical features of fly ash...
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
... eutectic compounds called sodium vanadates. The resulting volatile oxides, namely vanadates ( n Na 2 O·V 2 O 5 ) and vanadyl vanadates ( n Na 2 O·V 2 O 4 · m V 2 O 5 ), are carried along with the flue gases and condense over the tube surface as liquid slag. These compounds have low melting temperatures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430001
EISBN: 978-1-62708-253-2
..., is crushed to a size of 1 to 10 mm (0.04 to 0.4 in.) and is fed into the combustion chamber. Atmospheric air, which acts as both the fluidization air and the combustion air, is then delivered at pressure and flows through the bed after being preheated by the exhaust flue gases. The energy so produced...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320003
EISBN: 978-1-62708-332-4
... gases. Flue gases are collected near the furnace top and directed to stoves or heat exchangers called Cowper stoves . The furnace blast of air is circulated through the heat exchanger, creating a hot blast that improves the thermal efficiency. Oil, tar, natural gas, and powdered coal can be injected...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430149
EISBN: 978-1-62708-253-2
... at a different location on the far side (i.e., not facing the flue gases or the failure location) was that of banded ferrite and pearlite ( Fig. 6.6a ). This is the normal microstructure for the tube material. Near the failure location, the structure comprised spheroidized coagulated carbides in the ferrite...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430325
EISBN: 978-1-62708-253-2
... value of stress lower than the ultimate tensile strength of the material. Damage due to mechanical fatigue is mainly associated with externally applied stresses. High-frequency low-amplitude stresses are developed on account of vibrations due to irregular flow of flue gases or soot blowers, whereas low...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380017
EISBN: 978-1-62708-456-7
... furnaces employ a round or rectangular pot made of either steel or alloy. Heat is applied by two or more self-cooling burners that fire tangentially between the outer wall of the pot and the inner surface of the furnace lining. The hot gases are vented through a flue located near the top for atmosphere...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030176
EISBN: 978-1-62708-282-2
...; in architecture; for military applications (particularly for nonmagnetic hulls of submarines and mine countermeasure vessels); and for equipment in the petroleum, chemical, aerospace, power, and process industries. Environmental initiatives, such as flue gas desulfurization in the power industry and the adoption...
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: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370115
EISBN: 978-1-62708-447-5
... gases or by using an external air heating furnace. The flue gases consist of a high percentage of carbon monoxide (CO), and further combustion in a heat exchanger results in a hot blast temperature of 400 to 600 °C (752 to 1112 °F). The advantages of this type of system are: Ability to use...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200298
EISBN: 978-1-62708-354-6
..., and the specific environment. Table 22-12 shows a general ranking of the performance of the standard alloys in air, and in reducing and oxidizing flue gases containing different amounts of sulphur. Corrosion Resistance of Cast Heat-Resistant Alloys at 1800 °F (982 °C) in Various Atmospheres (Rates Based on 100...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080335
EISBN: 978-1-62708-304-1
... that causes serious corrosion problems for boiler tube materials. Gaseous combustion products include N 2 , O 2 , CO 2 , H 2 O, SO 2 , HCl, HF, and other gaseous impurities such as CO and HBr. These gaseous constituents are often measured by plant operators. Examples of these flue gas compositions measured...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430351
EISBN: 978-1-62708-253-2
... from flue gases caused fire-side corrosion on the OD surface by forming low-melting alkali pyrosulfate compounds. The corrosion was more aggravated at the weld location due to accumulation of alkali pyrosulfate that eventually exposed the internal porosity. Moreover, during operation, flow-induced...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430087
EISBN: 978-1-62708-253-2
... at relatively higher temperature in the creep range and they ensure heat transfer between the hot flue gases and the high-pressure steam passing through them. The economizer tubes act as a heat exchanger. They extract heat from the waste gases that exit the last SH or RH and utilize this heat to raise...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430204
EISBN: 978-1-62708-253-2
.... Energy dispersive spectroscopy on the red-colored corrosion product that had formed on the outer surface of the tube showed carbon, oxygen, magnesium, silicon, potassium, and calcium. The contamination was essentially due to moisture, unburnt fuel, and ash content from the flue gases. Energy dispersive...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030235
EISBN: 978-1-62708-282-2
..., oxidation, molten salts Fiberglass manufacturing recuperators 1090 1995 Oxidation, sulfidation, molten salts Source: Ref 26 Different behavior can arise at similar temperatures, depending on the source of heat, such as electrical heating elements, fuel combustion, flue gases and deposits...
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
... that most of the coal ash is captured to form a molten slag that coats the inside surface of the Cyclone barrels ( Ref 1 ). The combustion flue gas from the Cyclone barrels then enters the main furnace to generate steam. Stoker-firing boilers are very versatile for burning a wide range of solid fuels...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060085
EISBN: 978-1-62708-261-7
... of the bath and the flue at the other end. The flue (stack) was designed to be strong enough to draw the flame over the bath. The roof also was slanted to bounce or reverberate the flame (similar to sound echoes) off the ceiling and down across the metal to be melted in the molten bath. Electric Arc Furnace...