Air Humidity and Brush Contact Drop: The Effect of Water Vapor, Sulfur Dioxide, and Hydrogen Sulfide [includes discussion]

1954 ◽  
Vol 73 (2) ◽  
Author(s):  
Howard M. Elsey ◽  
Lawrence E. Moberly ◽  
John L. Johnson
Keyword(s):  
Hydrogen Sulfide ◽  
Water Vapor ◽  
Sulfur Dioxide ◽  
Air Humidity ◽  
Effect Of Water

scholarly journals Water vapor inhibits hydrogen sulfide detection in pulsed fluorescence sulfur monitors

2016 ◽  
Vol 9 (6) ◽  
pp. 2669-2673 ◽  
Author(s):  
Anders B. Bluhme ◽  
Jonas L. Ingemar ◽  
Carl Meusinger ◽  
Matthew S. Johnson
Keyword(s):  
Hydrogen Sulfide ◽  
Water Vapor ◽  
Sulfur Dioxide ◽  
Relative Humidity ◽  
Pollution Control ◽  
Sulfide Sulfur ◽  
Molybdenum Catalyst ◽  
Air Stream ◽  
Ambient Concentrations ◽  
Converter Unit

Abstract. The Thermo Scientific 450 Hydrogen Sulfide–Sulfur Dioxide Analyzer measures both hydrogen sulfide (H2S) and sulfur dioxide (SO2). Sulfur dioxide is measured by pulsed fluorescence, while H2S is converted to SO2 with a molybdenum catalyst prior to detection. The 450 is widely used to measure ambient concentrations, e.g., for emissions monitoring and pollution control. An air stream with a constant H2S concentration was generated and the output of the analyzer recorded as a function of relative humidity (RH). The analyzer underreported H2S as soon as the relative humidity was increased. The fraction of undetected H2S increased from 8.3 at 5.3 % RH (294 K) to over 34 % at RH  >  80 %. Hydrogen sulfide mole fractions of 573, 1142, and 5145 ppb were tested. The findings indicate that previous results obtained with instruments using similar catalysts should be re-evaluated to correct for interference from water vapor. It is suspected that water decreases the efficiency of the converter unit and thereby reduces the measured H2S concentration.

scholarly journals Water Vapor Inhibits Hydrogen Sulfide Detection in Pulsed Fluorescence Sulfur Monitors

2016 ◽  
Author(s):  
Anders B. Bluhme ◽  
Jonas L. Ingemar ◽  
Carl Meusinger ◽  
Matthew S. Johnson
Keyword(s):  
Hydrogen Sulfide ◽  
Water Vapor ◽  
Sulfur Dioxide ◽  
Relative Humidity ◽  
Pollution Control ◽  
Sulfide Sulfur ◽  
Molybdenum Catalyst ◽  
Air Stream ◽  
Ambient Concentrations ◽  
Converter Unit

Abstract. The Thermo Scientific 450 Hydrogen Sulfide - Sulfur Dioxide Analyzer measures both H2S and SO2. SO2 is measured by pulsed fluorescence, while H2S is converted to SO2 with a molybdenum catalyst prior to detection. The 450 is widely used to measure ambient concentrations, e.g. for emissions monitoring and pollution control. An air stream with a constant H2S concentration was generated and the output of the analyzer recorded as a function of relative humidity. The analyzer under-reported H2S as soon as the relative humidity was increased. The fraction of undetected H2S increased from 8.3 % at 5.3 % RH (294 K) to over 34 % at RH > 80 %. H2S mole fractions of 573, 1142, and 5145 ppb were tested. The findings indicate that previous results obtained with instruments using similar catalysts should be re-evaluated to correct for interference from water vapor. It is suspected that water decreases the efficiency of the converter unit and thereby reduces the measured H2S concentration.

The effect of water vapor in increasing growth stresses in the oxide scale on martensitic steam plant alloys

2005 ◽  
Vol 22 (1) ◽  
pp. 139-146 ◽  
Author(s):  
Alexander Donchev ◽  
Harald Fietzek ◽  
Vladislav Kolarik ◽  
Daniel Renusch ◽  
Michael Schütze
Keyword(s):  
Water Vapor ◽  
Oxide Scale ◽  
Growth Stresses ◽  
Effect Of Water ◽  
Steam Plant

Sulfurous Acid Corrosion of Low Carbon Steel at Ordinary Temperatures - I. Its Nature

CORROSION ◽  
1966 ◽  
Vol 22 (5) ◽  
pp. 143-146 ◽  
Author(s):  
W. McLEOD ◽  
R. R. ROGERS
Keyword(s):  
Water Vapor ◽  
Carbon Steel ◽  
Sulfur Dioxide ◽  
Corrosion Rate ◽  
Acid Corrosion ◽  
Low Carbon Steel ◽  
Rate Data ◽  
Low Carbon ◽  
Sulfurous Acid ◽  
Ordinary Temperature

Abstract Corrosion rate data are presented for low carbon steel in (1) a combination of sulfur dioxide, water vapor and air, and (2) aqueous solutions of sulfurous acid in the absence of air, at ordinary temperature. Information as to the nature of the corrosion products is presented and it is shown that this depends on the place in which the corrosion takes place to an important extent.

Effect of Water Vapor on Ignition Temperatures of Methane-Air Mixtures

1934 ◽  
Vol 26 (1) ◽  
pp. 71-72 ◽  
Author(s):  
G. W. Jones ◽  
Henry. Seaman
Keyword(s):  
Water Vapor ◽  
Effect Of Water
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