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fluidized bed furnaces

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Published: 01 March 2006
Fig. 8 Gas-fired fluidized-bed furnace with internal combustion. 1, insulating lagging; 2, refractory material; 3, air and gas distribution box; 4, fluidized bed; 5, parts to be treated. Source: Ref 6 More
Image
Published: 01 March 2006
Fig. 9 Externally gas-fired fluidized-bed furnace. Source: Ref 6 More
Image
Published: 01 January 1998
Fig. 6-13 Schematic showing the principle of the fluidized-bed furnace. (a) Initially, the gas flows upward through the permeable base to agitate the particles as the pressure is gradually increased. (b) Eventually, the gas flow is sufficient to lift the small particles of refractory materials More
Image
Published: 01 December 2003
Fig. 3 External resistance heating. (a) Fluidized-bed furnace with external heating by electrical resistance elements: (1) pivoting cover in two parts; (2) insulation; (3) refractory material; (4) fluidized bed; (5) resistance elements; (6) intake for fluidized gas (air or nitrogen); (7) parts More
Image
Published: 01 December 2003
Fig. 4 Fluidized-bed furnace with internal heating by electrical resistance elements: (1) pivoting cover in two parts; (2) insulation; (3) refractory material; (4) fluidized bed; (5) heating elements; (6) intake for fluidizing gas; (7) parts to be treated. Source: Ref 1 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900111
EISBN: 978-1-62708-350-8
... retort fluidized-bed. Source: Ref 1 Fig. 6 External gas-heated fluidized bed with recuperator. The use of regenerative burners where the exhaust gas temperature is only 200 °C (390 °F) achieves efficiencies similar to those of electrically heated furnaces. Source: Ref 1 Fig. 7...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 1998
DOI: 10.31399/asm.tb.ts5.t65900109
EISBN: 978-1-62708-358-4
... Abstract Furnaces for heat treatment of tool steels include ceramic-lined salt bath furnaces, vacuum furnaces, controlled-atmosphere furnaces, and fluidized-bed furnaces. This chapter describes the classification, operating principles, application, advantages, and disadvantages of each type...
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...
Image
Published: 01 January 1998
Fig. 6-16 Schematic of an indirectly heated fluidized-bed heat-treating furnace. The gas enters the furnace from the Supply line on bottom left. Source: Ref 8 More
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
... the exhaust of the furnace. The solids from the filter are recirculated into the bed, hence the name. In the CFBC type, the velocity of air is high, so the medium-sized particles are carried out of the combustor. Here, the fluidizing velocity exceeds the terminal velocity of individual bed particles...
Image
Published: 01 December 2003
Fig. 6 External gas-heated fluidized bed with recuperator. The use of regenerative burners where the exhaust gas temperature is only 200 °C (390 °F) achieves efficiencies similar to those of electrically heated furnaces. Source: Ref 1 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440275
EISBN: 978-1-62708-262-4
... that decarburization caused during induction heat treating generally is not a problem. The more common problem is decarburization that has not been removed prior to the induction hardening process. Fluidized Bed Processing The depth of decarburization of cold-worked steel in a fluidized bed at various...
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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900039
EISBN: 978-1-62708-350-8
... Box temper furnace Vertical air-circulating furnace Lift-off bell furnace Fluidized-bed furnace Salt bath furnace Insulating refractory brick Low thermal mass ceramic fiber insulating material Vacuum insulation Do not allow ammonia to come into contact with mercury...
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
... atmosphere containing 20% CO and 40% H 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...
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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900245
EISBN: 978-1-62708-350-8
... was present. In the fluidized-bed method of ferritic nitrocarburizing, a shallow case can occur due to low nitrogen volumes. Set the process gas flows accurately at the outset. There are two reasons for low case hardness; each is a result of the process control. First, poor precleaning of the material...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320033
EISBN: 978-1-62708-347-8
... and Hardenability Selection of Materials for Carburized Gears Hardness and Hardenability Cold Treatment Carburizing Temperature Gas Carburizing Furnaces and Equipment for Gas Carburizing Atmospheric Furnaces Vacuum Furnaces Fluidized Bed Furnaces Hardening Direct Quenching...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250163
EISBN: 978-1-62708-345-4
... Furnaces and Equipment for Gas Carburizing Vacuum and Fluidized Bed Furnaces Quenching and Hardening Direct Quenching Tempering of Carburized and Quenched Gears Recarburizing Reheating of Carburized Gears and Quenching Atmospheric Furnaces Surface Hardness Variations after Quenching...