Vanadium Pentoxide Deposition From Combustion Gases

1966 ◽  
Vol 88 (2) ◽  
pp. 173-178 ◽  
Author(s):  
A. B. Hedley ◽  
T. D. Brown ◽  
A. Shuttleworth
Keyword(s):  
Mass Transfer ◽  
Experimental Evidence ◽  
Vanadium Pentoxide ◽  
Liquid Fuel ◽  
Dew Point ◽  
Mass Transfer Equation ◽  
Combustion Gases ◽  
Deposition Surface ◽  
Excess Air ◽  
Theoretical Mass

The rate of deposition of vanadium pentoxide vapor from combustion gases produced by burning a liquid fuel (kerosene with added vanadium ethyl hexoate) under controlled mixing-history conditions has been shown to agree with the following theoretical mass transfer equation when considering cooled tubes in a transverse gas stream: m=0.8B(Sc)2/3(Pr)1/3(μρ)1/2VD1/2 Theoretical and experimental evidence indicates the existence of a “dew point” at a deposition surface temperature of about 670 C. In addition, it would appear that, for the mechanism of deposition under consideration, an “induction” or “immunity” period before the onset of deposition does not exist. Experimental evidence also shows that the rate of deposition was not affected by changes in the excess air level within the range 25 to 1 percent.

Role of mesopores in Co/ZSM-5 for the direct synthesis of liquid fuel by Fischer–Tropsch synthesis

2018 ◽  
Vol 8 (24) ◽  
pp. 6346-6359 ◽  
Author(s):  
Ji-Eun Min ◽  
Sungtak Kim ◽  
Geunjae Kwak ◽  
Yong Tae Kim ◽  
Seung Ju Han ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Pore Structure ◽  
Liquid Fuel ◽  
Direct Synthesis ◽  
Reaction System ◽  
Complex Reaction ◽  
Fischer Tropsch ◽  
Solid Catalysts ◽  
The Impact

In a complex reaction system, in which gas, liquid, and solid catalysts work together, understanding the impact of mass transfer that varies with the catalyst pore structure is very challenging but also essential to designing selective catalysts.

Combustion Turbine Deposition Observations From Residual and Simulated Residual Oil Studies

1982 ◽  
Author(s):  
G. A. Whitlow ◽  
S. Y. Lee ◽  
P. R. Mulik ◽  
R. A. Wenglarz ◽  
T. P. Sherlock ◽  
...  
Keyword(s):  
Vanadium Pentoxide ◽  
Field Experience ◽  
Dynamic Testing ◽  
Solid Particles ◽  
Residual Oil ◽  
Deposition Rates ◽  
Inertial Impaction ◽  
The Real ◽  
Combustion Gases ◽  
Current Utility

Burning residual oil in utility combustion turbines and the consequent deposition on blades and vanes may adversely affect reliability and operation. Corrosion and deposition data for combustion turbine materials have been obtained through dynamic testing in pressurized passages. The deposition produced by the 1900°F (1038°C) combustion gases from a simulated and a real residual oil on cooled Udimet 500 surfaces is described. Higher deposition rates for the doped fuel than for the real residual oil raised questions of whether true simulation with this approach can be achieved. Particles 4–8 μ m in dia predominated in the gas stream, with some fraction in the 0.1–12 μ m range. Deposition rates seemed to be influenced by thermophoretic delivery of small molten particles, tentatively identified as magnesium pyro and metavanadates and free vanadium pentoxide, which may act to bond the larger, solid particles arriving by inertial impaction to turbine surfaces. Estimated maintenance intervals for current utility turbines operating with washed and treated residual oil agreed well with field experience.

scholarly journals Pump hump characteristic research based on mass transfer equation

2015 ◽  
Vol 72 (3) ◽  
pp. 032016 ◽  
Author(s):  
D M Liu ◽  
Y Z Zhao ◽  
X B Liu ◽  
Y Ma ◽  
W F Wang
Keyword(s):  
Mass Transfer ◽  
Transfer Equation ◽  
Mass Transfer Equation

Mass Transfer Mechanisms of ASP Flooding in Porous Media

2012 ◽  
Vol 550-553 ◽  
pp. 2738-2744 ◽  
Author(s):  
Han Min Xiao ◽  
Ling Hui Sun ◽  
Hui Hui Kou
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Interfacial Tension ◽  
Transfer Equation ◽  
Mass Transfer Equation ◽  
Transfer Property ◽  
Asp Flooding ◽  
Transfer Mechanisms ◽  
Adsorption Factor

Experiments on chromatography separation are taken for ASP flooding. Mass transfer equation is estabilished and mutiple adsorption factor is obtained. Mutiple adsorption factor is used to analyze the experiment results. The Mass transfer property of alkali, surfactant and polymer during single fooding and ASP flooding and the effect on interfacial tension of oil/solution are discussed. The results show the diffrence of hesteris degree of alkali, surfactant and polymer deduce the chromatography separation, lowing the active of ASP flooding. Accoding to interfacial tension, the efficent length of ASP slug is discussed.

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