Hydrogen effect on flame extinction of hydrogen-enriched methane/air premixed flames: an assessment from the combustion safety point of view

Energy ◽  
2021 ◽  
pp. 122248
Author(s):  
Xiehe Yang ◽  
Tiantian Wang ◽  
Yang Zhang ◽  
Hai Zhang ◽  
Yuxin Wu ◽  
...  
Keyword(s):  
Premixed Flames ◽  
Point Of View ◽  
Hydrogen Effect ◽  
Flame Extinction

Effects of CO2 addition on flame extinction in interacting H2–air and CO–air premixed flames

Fuel ◽  
2014 ◽  
Vol 136 ◽  
pp. 69-78 ◽  
Author(s):  
Seung Wook Jung ◽  
Jeong Park ◽  
Oh Boong Kwon ◽  
Young Ju Kim ◽  
Sang In Keel ◽  
...  
Keyword(s):  
Premixed Flames ◽  
Flame Extinction ◽  
Co2 Addition

Biogas Combustion in Premixed Flames or Electrochemical Oxidation in SOFC: Exergy and Emission Comparison

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Francesco Quesito ◽  
Massimo Santarelli ◽  
Pierluigi Leone ◽  
Suresh K. Aggarwal
Keyword(s):  
Fuel Cells ◽  
Electrochemical Oxidation ◽  
Premixed Flames ◽  
Chemical Species ◽  
Chemical Oxidation ◽  
Point Of View ◽  
Operating Conditions ◽  
Partially Premixed Flames ◽  
Exhaust Stream ◽  
Partially Premixed

In the future energy pathway, characterized by flexibility of technologies and fuels, biogas could represent an alternative to conventional natural gas in feeding multiple types of technologies, both traditional thermal machines (chemical reactions), and innovative electrochemical generators such as fuel cells (electrochemical reactions). To compare the two pathways of energy production, two criteria are considered: (a) environmental analysis (emissions) and (b) exergy analysis. The results of the environmental and exergy comparison are presented and discussed in case of two selected transformation processes: partially premixed flames (PPFs, for chemical processes) and solid oxide fuel cells (SOFCs, for electrochemical processes), for a range of operating conditions. From an environmental point of view, the PPF exhaust stream has significant traces of NOx and C2H2, which are precursors of atmosphere pollution, while the SOFC exhaust stream does not contain such chemical species due to the absence of combustion. From a exergy point of view, the utilisation of the biogas in form of electrochemical oxidation in a SOFC indicates significantly higher exergetic efficiency compared to the chemical oxidation in partially premixed flames.

scholarly journals Effect of Chemical Interaction on Flame Extinction in Interacting H2-air and CO-air Premixed Flames

2013 ◽  
Vol 18 (4) ◽  
pp. 44-52
Author(s):  
Seongwook Jung ◽  
Jeong Park ◽  
Ohboong Kwon ◽  
Sangin Keel ◽  
Jinhan Yun
Keyword(s):  
Chemical Interaction ◽  
Premixed Flames ◽  
Flame Extinction

Flame extinction in interacting CO-air and syngas-air premixed flames

2015 ◽  
Vol 29 (1) ◽  
pp. 419-428 ◽  
Author(s):  
Jisoo Ha ◽  
Jeong Park ◽  
Oh Boong Kwon ◽  
In Gweon Lim ◽  
Jin Han Yun ◽  
...  
Keyword(s):  
Premixed Flames ◽  
Flame Extinction

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

How a sheperd guides a sheep herd?

1984 ◽  
Vol 75 ◽  
pp. 331-337
Author(s):  
Richard Greenberg
Keyword(s):  
Point Of View ◽  
Single Ring ◽  
Damping Effects ◽  
Ring Particle

ABSTRACTThe mechanism by which a shepherd satellite exerts a confining torque on a ring is considered from the point of view of a single ring particle. It is still not clear how one might most meaningfully include damping effects and other collisional processes into this type of approach to the problem.

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