scholarly journals Development of Criteria for Flashback Propensity in Jet Flames for High Hydrogen Content and Natural Gas Type Fuels

2016 ◽  
Author(s):  
Alireza Kalantari ◽  
Elliot Sullivan-Lewis ◽  
Vincent McDonell
Keyword(s):  
Natural Gas ◽  
Hydrogen Content ◽  
Jet Flames ◽  
High Hydrogen ◽  
High Hydrogen Content

scholarly journals Promising methods for hydrogen producing

2020 ◽  
Vol 18 (1) ◽  
pp. 23-28
Author(s):  
G.E. Ergazieva ◽  
M.M. Telbayeva ◽  
K. Dossumov ◽  
A.I. Niyazbayeva
Keyword(s):  
Hydrogen Production ◽  
Natural Gas ◽  
Hydrogen Content ◽  
Raw Materials ◽  
Energy Carrier ◽  
High Hydrogen ◽  
High Hydrogen Content ◽  
Potential Sources ◽  
Content Availability ◽  
Elemental Form

Hydrogen production is one of the most promising ways to develop the energy sector of the future. Hydrogen does not exist in nature in its elemental form and therefore, it must be obtained from hydrocarbon, water or any other hydrogen-containing compounds. The variety of potential sources of raw materials for hydrogen production is one of the important reasons, in which hydrogen is such a promising energy carrier. The article describes methods for preparing the basic energy carrier, hydrogen from natural gas, ethanol etc. Among various types of raw materials, bioethanol is very attractive because of its relatively high hydrogen content, availability, as well as safety during storage and handling.

Evaluation of a Turbulent Jet Flame Flashback Correlation Applied to Annular Flow Configurations with and Without Swirl

2020 ◽  
Author(s):  
Elliot Sullivan Lewis ◽  
Vincent McDonell ◽  
Alireza Kalantari ◽  
Priyank Saxena
Keyword(s):  
Hydrogen Content ◽  
Gas Turbines ◽  
Annular Flow ◽  
Jet Flames ◽  
High Hydrogen ◽  
Jet Flame ◽  
High Hydrogen Content ◽  
Round Jet ◽  
Significant Difference ◽  
Flow Configurations

Abstract The adaptation of high hydrogen content fuels for low emissions gas turbines represents a potential opportunity to reduce the carbon footprint of these devices. The high flame speed of hydrogen air mixtures combined with the small quenching distances poses a challenge for using these fuels in situations where significant premixing is desired. Flashback along the walls (i.e., boundary layer flashback) can be exacerbated with high hydrogen content fuels. In the present work, the ability of a flashback correlation previously developed for round jet flames is evaluated for its ability to predict flashback in an annular flow with and without swirl. Flashback data are obtained for various mixtures of hydrogen and methane and hydrogen and carbon monoxide for all the annular flow configurations. Pressures from 3-8 bar are tested with mixture temperatures up to 750 K. Flashback is induced by slowly increasing the equivalence ratio. The results obtained show that the same form of the correlation developed for round jet flames can be used to correlate flashback behavior for the annular flow case with and without swirl despite the presence of the centerbody. Adjustments to some of the constants in the original model were made to obtain the best fit, but in general, the correlation is quite similar to that developed for the round jet flame. A significant difference with the annular flow configurations is the determination of the appropriate gradient at the wall, which in the present case is determined using a cold flow CFD simulation.

Evaluation of a Turbulent Jet Flame Flashback Correlation Applied to Annular Flow Configurations With and Without Swirl

2020 ◽  
Author(s):  
E. Sullivan Lewis ◽  
Vincent G. McDonell ◽  
Alireza Kalantari ◽  
Priyank Saxena
Keyword(s):  
Hydrogen Content ◽  
Gas Turbines ◽  
Annular Flow ◽  
Jet Flames ◽  
High Hydrogen ◽  
Jet Flame ◽  
High Hydrogen Content ◽  
Round Jet ◽  
Significant Difference ◽  
Flow Configurations

Abstract The adaptation of high hydrogen content fuels for low emissions gas turbines represents a potential opportunity to reduce the carbon footprint of these devices. The high flame speed of hydrogen air mixtures combined with the small quenching distances poses a challenge for using these fuels in situations where significant premixing is desired. In particular flashback in either the core flow or along the walls (i.e., boundary layer flashback) can be exacerbated with high hydrogen content fuels. In the present work, the ability of a flashback correlation previously developed for round jet flames is evaluated for its ability to predict flashback in an annular flow. As a first step, an annular flow is generated with a centerbody located at the centerline of the original round jet flame. Next, various levels of axial swirl is added to that annular flow. Additional flashback data are obtained for various mixtures of hydrogen and methane and hydrogen and carbon monoxide for all-the annular flow configurations. Pressures from 3–8 bar are tested with mixture temperatures up to 750 K. Flashback is induced by slowly increasing the equivalence ratio. The results obtained show that the same form of the correlation developed for round jet flames can be used to correlate flashback behavior for the annular flow case with and without swirl despite the presence of the centerbody. Adjustments to some of the constants in the original model were made to obtain the best fit, but in general, the correlation is quite similar to that developed for the round jet flame. A significant difference with the annular flow configurations is the determination of the appropriate gradient at the wall, which in the present case is determined using a cold flow CFD simulation.

Turbulent Consumption Speeds of High Hydrogen Content Fuels From 1–20 atm

2013 ◽  
Author(s):  
Prabhakar Venkateswaran ◽  
Andrew D. Marshall ◽  
Jerry M. Seitzman ◽  
Tim C. Lieuwen
Keyword(s):  
Burning Rate ◽  
Hydrogen Content ◽  
Pressure Effects ◽  
Pressure Sensitivity ◽  
Mass Burning Rate ◽  
High Hydrogen ◽  
High Hydrogen Content ◽  
Fuel Blends ◽  
Correlate Data

This work describes measurements and analysis of the turbulent consumption speeds, ST,GC, of H2/CO fuel blends. We report measurements of ST,GC at pressures and normalized turbulence intensities, u′rms/SL,0 up to 20 atm and 1800, respectively for a variety of H2/CO mixtures and equivalence ratios. In addition, we present correlations of these data using laminar burning velocities of highly stretched flames, SL,max, derived from quasi-steady leading points models. These analyses show that SL,max can be used to correlate data over a broad range of fuel compositions, but do not capture the pressure sensitivity of ST,GC. We suggest that these pressure effects are more fundamentally a manifestation of non-quasi-steady behavior in the mass burning rate at the flame leading points.

scholarly journals Production of JET fuel containing molecules of high hydrogen content

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Sz. Tomasek ◽  
Z. Varga ◽  
A. Holló ◽  
N. Miskolczi ◽  
J. Hancsók
Keyword(s):  
Hydrogen Content ◽  
Alternative Fuels ◽  
Jet Fuel ◽  
Plastic Waste ◽  
High Hydrogen ◽  
High Hydrogen Content ◽  
Waste Polyethylene ◽  
Harmful Effects

AbstractThe harmful effects of aviation can only be reduced by using alternative fuels with excellent burning properties and a high hydrogen content in the constituent molecules. Due to increasing plastic consumption the amount of the plastic waste is also higher. Despite the fact that landfill plastic waste has been steadily reduced, the present scenario is not satisfactory. Therefore, the aim of this study is to produce JET fuel containing an alternative component made from straight-run kerosene and the waste polyethylene cracking fraction. We carried out our experiments on a commercial NiMo/Al

The origin of high hydrogen content in kimberlitic olivine: Evidence from hydroxyl zonation in olivine from kimberlites and mantle xenoliths

Lithos ◽  
2014 ◽  
Vol 202-203 ◽  
pp. 429-441 ◽  
Author(s):  
Luke Hilchie ◽  
Yana Fedortchouk ◽  
Sergei Matveev ◽  
Maya G. Kopylova
Keyword(s):  
Hydrogen Content ◽  
Mantle Xenoliths ◽  
High Hydrogen ◽  
High Hydrogen Content
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