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fluidized bed furnaces

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440055
EISBN: 978-1-62708-262-4
..., and disadvantages of furnaces classified based on the heat transfer medium employed. The types of furnaces covered are batch-type, continuous-type, liquid bath, fluidized bed, and vacuum. The subsequent sections provide information on furnace parts, fixtures, quenching mediums, and quenching systems. The final...
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
..., intended to reduce NOx emissions, accelerates tube wall wastage. It also covers circumferential cracking in furnace waterwalls, thermal fatigue cracking induced by waterlances and water cannons, superheater-reheater corrosion, and erosion in fluidized-bed boilers. coal-fired boilers combustion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430001
EISBN: 978-1-62708-253-2
... Abstract Boilers are engineered systems designed to convert the chemical energy in fuel into heat to generate hot water or steam. This chapter describes boiler applications and types, including firetube boilers, watertube boilers, electric boilers, packaged boilers, fluidized bed combustion...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770037
EISBN: 978-1-62708-337-9
... 2 in contact with plain-carbon steel at various workpiece temperatures. Source: Ref 1 Virta ( Ref 6 ) presented the time-temperature relationship for decarburization of a 0.9% tool steel during reheating in air in a fluidized bed furnace ( Fig. 2.5 ). Thus, decarburization to a depth...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080235
EISBN: 978-1-62708-304-1
... velocity in the range of 12 to 18 m/s (40 to 60 ft/s) ( Ref 5 ). Lower velocities would be used for a boiler burning coals 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440275
EISBN: 978-1-62708-262-4
... of decarburization of cold-worked steel in a fluidized bed at various temperatures is shown in Fig. 3 . Fig. 3 Depth of decarburization of a cold-worked steel in a fluidized bed in air. Source: Ref 1 ...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310055
EISBN: 978-1-62708-326-3
.... Quenching of steel from a suitable elevated temperature generally is accomplished by immersion of the hot steel into a vaporizable fluid such as water; petroleum, vegetable, or animal oil; aqueous polymer solution; or an aqueous (salt) solution. Other quenching media include molten salt, fluidized bed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060197
EISBN: 978-1-62708-261-7
... on hardenability and tempering response. It discusses the significance of critical temperatures, the use of transformation diagrams, and types of annealing treatments. It also provides information on heat treating furnaces, the effect of heating rate on transformation temperatures, quench and temper procedures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430204
EISBN: 978-1-62708-253-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220281
EISBN: 978-1-62708-341-6
... in a fluidized bed by an air-flow system ( Fig. 11.5 ). The material to be coated is raised to the temperature necessary for reflow of the coating material by induction methods, and, as it is passed through the bed, the powder melts on the surface of the part. The thickness of the coating is dependent...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480001
EISBN: 978-1-62708-318-8
... melting in cold-mold furnace, circumvention of hydrogen embrittlement due to inadequate vacuum melting, chemical cleaning and use of gas furnaces, and hot salt stress-corrosion cracking due to chlorides on stressed specimens above 3000 °C (5400 °F). During the early 1950s, the value of aluminum, manganese...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440159
EISBN: 978-1-62708-262-4
... is by a technique commonly known as shell hardening . The workpiece is immersed either fully or selectively in a high-conductivity heating medium such as a fluidized bed or a salt bath, but only long enough to completely heat the outer layers. If the part is round (wheels or gears) and the requirement is that only...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490001
EISBN: 978-1-62708-340-9
... processes in which coal is combusted in a fluidized bed containing lime or is converted into coal-derived gas or liquid and then combusted are being vigorously pursued worldwide. Jaffee has described ten different plant configurations for generating electricity from coal, as shown in Fig. 1.2 ( Ref 4...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440207
EISBN: 978-1-62708-262-4
... and austempering techniques include: Hot oil quenching (≤240 °C, or 460 °F, only) Nitrate/nitrite salt quenches Fluidized bed quenching (only for small, thin parts) Lead baths (for tool-type applications) Austenitizing temperatures between 845 and 925 °C (1555 and 1695 °F) are normal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410029
EISBN: 978-1-62708-280-8
... lubrication, and a robot for casting extraction. A central melting unit serves several such cells. Each machine is provided with a holding furnace filled periodically by a distribution ladle that transfers metal from a central melting furnace. Fig. 4.6 Die casting cell elements Castings...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440125
EISBN: 978-1-62708-262-4
... stresses. It is not a tempering procedure, as the name implies, and is more properly termed “marquenching.” Martempering of steel consists of (1) quenching from the austenitizing temperature into a hot fluid medium (hot oil, molten salt, molten metal, or a fluidized particle bed) at a temperature...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910363
EISBN: 978-1-62708-250-1
... plant furnace parts Carbon steel Heat treating pots Carbon steel Structural members High-nickel alloy steel Thermowells Carbon and stainless steels Steam power and cogeneration Waterwell tubes 2 1 4 % Cr-1% Mo steel Fluidized bed combustor tubes 2 1 4 % Cr-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
... RDF fuel prior to combustion. Thus, RDF fuel has a higher heating value than that of a mass-burning unit. A small number of boilers in use today are based on the fluidized-bed technology. The mass-burning unit uses a mechanical stoker to feed the fuel onto a grate where the fuel is combusted. For most...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240177
EISBN: 978-1-62708-251-8
... to cracking. Martempering can be accomplished in a variety of baths, including hot oil, molten salt, molten metal, or a fluidized particle bed. Molten salt and hot oil are both widely used for martempering. Oils are used for martempering at temperatures up to 205 °C (400 °F), while molten salt is used...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130255
EISBN: 978-1-62708-284-6