Suppression of Carbon Dust Formation by Nitrogen Injection into Hydrogen Plasmas in Detached Plasma Conditions

One of the main reasons for coal mine fire is spontaneous combustion of residual coal in gob. As the difference of compaction degree of coal and rock, the underground gob can be considered as a porous medium and divided into “three zones” in accordance with the criteria. The “three zones” are “heat dissipation zone”, “oxidation zone” and “choking zone”, respectively. Temperature programming experiments are taken and numerical simulation with obtained experimental data is utilized to analyze the distribution of “three zones” in this paper. Different width and depth of “oxidation zone” are obtained when the inlet air velocity is changed. As the nitrogen injection has inhibition effect on spontaneous combustion of residual coal in gob, nitrogen is injected into the gob. The widths of “oxidation zone” are compared before and after nitrogen injection. And ultimately the optimum location and volume of nitrogen injection are found out.

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Assessment of Scrape-Off Layer and divertor plasma conditions in JT-60SA with tungsten wall and nitrogen injection

Nuclear Materials and Energy ◽

10.1016/j.nme.2020.100895 ◽

2021 ◽

Vol 26 ◽

pp. 100895

Author(s):

G. Rubino ◽

G. Calabrò ◽

M. Wischmeier

Keyword(s):

Nitrogen Injection

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Coupling Treatment of Gas Drainage and Nitrogen Injection for Fire Prevention in the First Stratified Mining goaf：Theoretical Calculation and Field Experiment

Combustion Science and Technology ◽

10.1080/00102202.2021.1895774 ◽

2021 ◽

pp. 1-15

Author(s):

Yu Hao ◽

Taiping Xie

Keyword(s):

Field Experiment ◽

Fire Prevention ◽

Gas Drainage ◽

Nitrogen Injection ◽

Coupling Treatment

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Optical/infrared observations of RV Tauri stars

Symposium - International Astronomical Union ◽

10.1017/s0074180900157262 ◽

1987 ◽

Vol 122 ◽

pp. 537-540

Author(s):

M. J. Goldsmith ◽

A. Evans ◽

J. S. Albinson ◽

M. F. Bode

Keyword(s):

Dust Formation ◽

Infrared Excess ◽

Infrared Observations ◽

Dust Shells ◽

Discernible Difference

Optical/infrared observations of RV Tauri stars obtained at SAAO have allowed the natures of the dust shells around stars with infrared excess to be investigated. The data suggest that dust formation occurs sporadically and that some stars have multiple shells. There is no photometrically discernible difference between carbon- and oxygen-rich stars or their dust shells. There is some evidence that stars with higher metallicity have more dust.

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Zooming into the complex dusty envelopes of C-rich AGB stars

Proceedings of the International Astronomical Union ◽

10.1017/s1743921318006300 ◽

2018 ◽

Vol 14 (S343) ◽

pp. 456-457

Author(s):

Foteini Lykou ◽

Josef Hron ◽

Daniela Klotz

Keyword(s):

Temperature Distribution ◽

Near Infrared ◽

Angular Resolution ◽

High Angular Resolution ◽

Dust Formation ◽

Agb Stars ◽

Circumstellar Envelopes ◽

Recent Advances ◽

Multi Wavelength

AbstractRecent advances in high-angular resolution instruments (VLT and VLTI, ALMA) have enabled us to delve deep into the circumstellar envelopes of AGB stars from the optical to the sub-mm wavelengths, thus allowing us to study in detail the gas and dust formation zones (e.g., their geometry, chemistry and kinematics). This work focuses on four (4) C-rich AGB stars observed with a high-angular resolution technique in the near-infrared: a multi-wavelength tomographic study of the dusty layers of the circumstellar envelopes of these C-rich stars, i.e. the variations in the morphology and temperature distribution.

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