scholarly journals Corrosion of Alloy 800H in caustic-contaminated superheated steam at 538/sup 0/C (1000/sup 0/F)

1979 ◽  
Author(s):  
J. C. Griess ◽  
W. A. Maxwell
Keyword(s):  
Superheated Steam ◽  
Alloy 800H

Could biomass-fueled boilers be operated at higher steam temperatures? Part 3: Initial analysis of costs and benefits

TAPPI Journal ◽  
2014 ◽  
Vol 13 (8) ◽  
pp. 65-78 ◽  
Author(s):  
W.B.A. (SANDY) SHARP ◽  
W.J. JIM FREDERICK ◽  
JAMES R. KEISER ◽  
DOUGLAS L. SINGBEIL
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Superheated Steam ◽  
Black Liquor ◽  
Simulation Software ◽  
Operating Conditions ◽  
Costs And Benefits ◽  
Steam Generation ◽  
Fireside Corrosion ◽  
Corrosion Resistant

The efficiencies of biomass-fueled power plants are much lower than those of coal-fueled plants because they restrict their exit steam temperatures to inhibit fireside corrosion of superheater tubes. However, restricting the temperature of a given mass of steam produced by a biomass boiler decreases the amount of power that can be generated from this steam in the turbine generator. This paper examines the relationship between the temperature of superheated steam produced by a boiler and the quantity of power that it can generate. The thermodynamic basis for this relationship is presented, and the value of the additional power that could be generated by operating with higher superheated steam temperatures is estimated. Calculations are presented for five plants that produce both steam and power. Two are powered by black liquor recovery boilers and three by wood-fired boilers. Steam generation parameters for these plants were supplied by industrial partners. Calculations using thermodynamics-based plant simulation software show that the value of the increased power that could be generated in these units by increasing superheated steam temperatures 100°C above current operating conditions ranges between US$2,410,000 and US$11,180,000 per year. The costs and benefits of achieving higher superheated steam conditions in an individual boiler depend on local plant conditions and the price of power. However, the magnitude of the increased power that can be generated by increasing superheated steam temperatures is so great that it appears to justify the cost of corrosion-mitigation methods such as installing corrosion-resistant materials costing far more than current superheater alloys; redesigning biomassfueled boilers to remove the superheater from the flue gas path; or adding chemicals to remove corrosive constituents from the flue gas. The most economic pathways to higher steam temperatures will very likely involve combinations of these methods. Particularly attractive approaches include installing more corrosion-resistant alloys in the hottest superheater locations, and relocating the superheater from the flue gas path to an externally-fired location or to the loop seal of a circulating fluidized bed boiler.

KUBOTA ALLOY KHR32C

Alloy Digest ◽  
1999 ◽  
Vol 48 (6) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Alloy 800H ◽  
Creep Ductility

Abstract Kubota alloy KHR32C is often regarded as the cast version of Fe-Ni-Cr alloy 800H except it uses niobium as a strengthening agent. The moderately priced alloy has good creep ductility and is available in many cast forms. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on casting. Filing Code: SS-746. Producer or source: Kubota Metal Corporation.

EFFECT OF Bi ADDITION ON THE CORROSION RESISTANCE OF Zr-4 IN SUPERHEATED STEAM AT 400 ℃/10.3 Mpa

2012 ◽  
Vol 48 (9) ◽  
pp. 1097 ◽  
Author(s):  
Meiyi YAO ◽  
Linghong ZOU ◽  
Xingfei XIE ◽  
Jinlong ZHANG ◽  
Jianchao PENG ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Superheated Steam
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