The oxidation of incoloy 800 in moist air containing hcl(g) at 800°C

The Steam Generators (SG), equipment that ensures the connection between the primary and secondary circuits, creates several safety problems during operation, mainly due to corrosion and mechanical damages. To provide information about the corrosion behaviour of the structural materials from CANDU SG under normal and abnormal conditions of operation and to identify the failure types produced by the corrosion were performed corrosion experiments consisting in chemical accelerated tests, static autoclaving and electrochemical methods. The gravimetric method, optical metallographic microscopy, XRD and EDS analysis, as well as electrochemical measurements have been used to evaluate the corrosion behavior of the steam generator tubes material (Incoloy-800).

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Post-Plasma Catalysis for Trichloroethylene Abatement with Ce-Doped Birnessite Downstream DC Corona Discharge Reactor

Catalysts ◽

10.3390/catal11080946 ◽

2021 ◽

Vol 11 (8) ◽

pp. 946

Author(s):

Grêce Abdallah ◽

Jean-Marc Giraudon ◽

Rim Bitar ◽

Nathalie De Geyter ◽

Rino Morent ◽

...

Keyword(s):

Corona Discharge ◽

Active Oxygen Species ◽

Surface Acidity ◽

Good Stability ◽

Ozone Decomposition ◽

Moist Air ◽

Plasma Catalysis ◽

Dry Air ◽

Water Tolerance ◽

By Products

Trichloroethylene (TCE) removal was investigated in a post-plasma catalysis (PPC) configuration in nearly dry air (RH = 0.7%) and moist air (RH = 15%), using, for non-thermal plasma (NTP), a 10-pin-to-plate negative DC corona discharge and, for PPC, Ce0.01Mn as a catalyst, calcined at 400 °C (Ce0.01Mn-400) or treated with nitric acid (Ce0.01Mn-AT). One of the key points was to take advantage of the ozone emitted from NTP as a potential source of active oxygen species for further oxidation, at a very low temperature (100 °C), of untreated TCE and of potential gaseous hazardous by-products from the NTP. The plasma-assisted Ce0.01Mn-AT catalyst presented the best CO2 yield in dry air, with minimization of the formation of gaseous chlorinated by-products. This result was attributed to the high level of oxygen vacancies with a higher amount of Mn3+, improved specific surface area and strong surface acidity. These features also allow the promotion of ozone decomposition efficiency. Both catalysts exhibited good stability towards chlorine. Ce0.01Mn-AT tested in moist air (RH = 15%) showed good stability as a function of time, indicating good water tolerance also.

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Transport properties of real moist air, dry air, steam, and water

Science and Technology for the Built Environment ◽

10.1080/23744731.2021.1877519 ◽

2021 ◽

pp. 1-9

Author(s):

Sebastian Herrmann ◽

Hans-Joachim Kretzschmar ◽

Vikrant C. Aute ◽

Donald P. Gatley ◽

Eckhard Vogel

Keyword(s):

Transport Properties ◽

Moist Air ◽

Dry Air

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A PLEA FOR CONSERVATIVE TREATMENT IN THE CATARRHAL CHILD BY THE MORE FREQUENT USE OF WARM MOIST AIR INHALATIONS

The Medical Journal of Australia ◽

10.5694/j.1326-5377.1972.tb47323.x ◽

1972 ◽

Vol 2 (6) ◽

pp. 335-336

Keyword(s):

Conservative Treatment ◽

Moist Air ◽

Frequent Use

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A Study of Moist Air Condensation Characteristics in a Transonic Flow System

Energies ◽

10.3390/en14134052 ◽

2021 ◽

Vol 14 (13) ◽

pp. 4052

Author(s):

Jie Wang ◽

Hongfang Gu

Keyword(s):

Mach Number ◽

Relative Humidity ◽

Transonic Flow ◽

Flow System ◽

Plane Surface ◽

Droplet Growth ◽

Moist Air ◽

Dry Air ◽

Hydraulic Equipment ◽

Non Equilibrium

When water vapor in moist air reaches supersaturation in a transonic flow system, non-equilibrium condensation forms a large number of droplets which may adversely affect the operation of some thermal-hydraulic equipment. For a better understanding of this non-equilibrium condensing phenomenon, a numerical model is applied to analyze moist air condensation in a transonic flow system by using the theory of nucleation and droplet growth. The Benson model is adopted to correct the liquid-plane surface tension equation for realistic results. The results show that the distributions of pressure, temperature and Mach number in moist air are significantly different from those in dry air. The dry air model exaggerates the Mach number by 19% and reduces both the pressure and the temperature by 34% at the nozzle exit as compared with the moist air model. At a Laval nozzle, for example, the nucleation rate, droplet number and condensation rate increase significantly with increasing relative humidity. The results also reveal the fact that the number of condensate droplets increases rapidly when moist air reaches 60% relative humidity. These findings provide a fundamental approach to account for the effect of condensate droplet formation on moist gas in a transonic flow system.

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