scholarly journals Combustion of Single Droplet of Long Ignition Delay Fuel Oils in High Temperature Air

2013 ◽  
Vol 48 (1) ◽  
pp. 110-115
Author(s):  
Takeyuki Kishi ◽  
Kazuo Hatori ◽  
Sumito Nishio ◽  
Zhide Xu
Keyword(s):  
High Temperature ◽  
Ignition Delay ◽  
Single Droplet ◽  
Fuel Oils

scholarly journals The Viscosity and Combustion Characteristics of Single-Droplet Water-Diesel Emulsion

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1963 ◽  
Author(s):  
Jonghan Won ◽  
Seung Wook Baek ◽  
Hyemin Kim ◽  
Hookyung Lee
Keyword(s):  
High Temperature ◽  
Burning Rate ◽  
Diesel Fuel ◽  
Ignition Delay ◽  
Environmental Problem ◽  
Mixing Time ◽  
Environmental Problems ◽  
Combustion Characteristics ◽  
Emulsion Droplet ◽  
Single Droplet

Diesel fuel exhibits excellent combustion characteristics and stability. However, diesel use is becoming restricted because of its associated environmental problems. Fuel emulsification, which increases efficiency and reduces pollution, became the solution of environmental problem. In this study, five water:diesel emulsions with mass ratios (0.3, 0.6, 1.0, 1.2, and 1.5) via ultrasonication were synthesized with and without surfactant. The optimal water:diesel ratio (=1:1) of an emulsion containing the surfactant was found by analyzing fuel concentration, mixing time, and viscosity. The combustion characteristics of single-droplet optimal emulsions were studied through ignition delay, burning rate, and total droplet lifetime at high temperature (400–700 °C) and pressure (1–15 bar), and micro-explosion phenomenon was observed. Although the ignition delay of emulsion increased, the total lifetime of the emulsion droplet was lower than that of diesel under 5 bar, 600 °C condition.

Advances in Nanotechnology Transition Metal Catalysts in Oxidative Desulfurization (ODS) Processes

2016 ◽  
pp. 180-215 ◽  
Author(s):  
Raffaele Saladino ◽  
Giorgia Botta ◽  
Marcello Crucianelli
Keyword(s):  
Energy Efficiency ◽  
High Temperature ◽  
Environmental Impact ◽  
Aromatic Compounds ◽  
Oxidative Desulfurization ◽  
Transition Metal Catalysts ◽  
Organosulfur Compounds ◽  
Promising Alternative ◽  
Fuel Oils ◽  
Negative Environmental Impact

Organosulfur compounds show a negative environmental impact because of SOx emissions by combustion of fuel oils. As a consequence, removal of sulfur is becoming a worldwide challenge. The hydrodesulfurization (HDS) process achieves limited performances in the case of refractory S-containing aromatic compounds, such as thiophene and substituted benzothiophenes (BTs), which require highly energy-demanding conditions (high temperature and pressure conditions). Oxidative desulfurization (ODS) is considered the most promising alternative to HDS. During ODS treatment, the organosulfur compounds are oxidized to corresponding sulfoxides and sulfones, which can be successively removed by extraction with polar solvents. Different stoichiometric oxidants have been used in the ODS processes with a different degree of efficacy and environmental impact. The design and development of catalytic procedures can increase the ODS energy efficiency as well as make it more economical and environmentally acceptable. Here we describe the advances in nanostructured organometallic catalysis and biotechology applied to ODS treatment.

Shock tube studies on ignition delay and combustion characteristics of oxygenated fuels under high temperature

2020 ◽  
Vol 44 (13) ◽  
pp. 10101-10111 ◽  
Author(s):  
Zhihao Ma ◽  
Weixin Du ◽  
Xin Wang ◽  
Enyu Lv ◽  
Yongchao Dong
Keyword(s):  
High Temperature ◽  
Shock Tube ◽  
Ignition Delay ◽  
Combustion Characteristics ◽  
Oxygenated Fuels

Comparative Investigation of N-Heptane Droplet Ignition in High Temperature Convective Environments

2007 ◽  
Author(s):  
J. Chen ◽  
X. F. Peng ◽  
Y. G. Ju ◽  
B. X. Wang
Keyword(s):  
High Temperature ◽  
Ignition Delay ◽  
Comparative Investigation ◽  
Elementary Reactions ◽  
Fuel Droplets ◽  
Ignition Delay Times ◽  
Delay Times ◽  
One Step ◽  
Flame Behavior ◽  
Skeletal Mechanism

A 2-D numerical model was proposed to investigate the ignition of liquid fuel droplets in convective environments at high temperature. This model employed a skeletal mechanism consisting of 34 reactive species and 56 elementary reactions, rather than one-step overall reaction as in normal 2-D droplet ignition models, because the skeletal mechanism for n-heptane reproduces ignition delay times at various temperatures and pressures reasonably well. In present investigation an emphasis was addressed on the comparative analysis of suitability of the model, particularly numerical simulations were compared with experiments available in the literature, or for N-heptane droplets ignition in the convective air at temperature in a range of 1100K∼1400K and velocity of 2m/s. The ignition delay time and ignition position were obtained using an ignition criterion based on OH radical mass fraction. The flame behavior after ignition was also studied comparatively. The agreement between numerical simulation and experiments is reasonably good.

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