scholarly journals Low temperature combustion of organic coal-water fuel droplets containing petrochemicals while soaring in a combustion chamber model

2017 ◽  
Vol 21 (2) ◽  
pp. 1057-1066 ◽  
Author(s):  
Timur Valiullin ◽  
Pavel Strizhak ◽  
Sergey Shevyrev
Keyword(s):  
Combustion Chamber ◽  
Traditional Approach ◽  
Low Temperature Combustion ◽  
Fuel Droplets ◽  
Ignition Delay Times ◽  
Coal Particles ◽  
Integral Characteristics ◽  
Temperature Combustion ◽  
Ignition Characteristics ◽  
Thermocouple Junction

The paper examines the integral characteristics (minimum temperature, ignition delay times) of stable combustion initiation of organic coal-water fuel droplets (initial radius is 0.3-1.5 mm) in the oxidizer flow (the temperature and velocity varied in ranges 500-900 K, 0.5-3 m/s). The main components of organic coal-water fuel were: brown coal particles, filter-cakes obtained in coal processing, waste engine, and turbine oils. The different modes of soaring and ignition of organic coal-water fuel have been established. The conditions have been set under which it is possible to implement the sustainable soaring and ignition of organic coal-water fuel droplets. We have compared the ignition characteristics with those defined in the traditional approach (based on placing the droplets on a low-inertia thermocouple junction into the combustion chamber). The paper shows the scale of the influence of heat sink over the thermocouple junction on ignition inertia. An original technique for releasing organic coal-water fuel droplets to the combustion chamber was proposed and tested. The limitations of this technique and the prospects of experimental results for the optimization of energy equipment operation were also formulated.

Flame extinction and low-temperature combustion of isolated fuel droplets of n-alkanes

2017 ◽  
Vol 36 (2) ◽  
pp. 2531-2539 ◽  
Author(s):  
Alberto Cuoci ◽  
Abd E. Saufi ◽  
Alessio Frassoldati ◽  
Daniel L. Dietrich ◽  
Forman A. Williams ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Combustion ◽  
Flame Extinction ◽  
Fuel Droplets ◽  
Temperature Combustion

scholarly journals The Combustion of Emulsified Glycerol-Heavy Oil Fuel Droplet

2018 ◽  
Vol 5 ◽  
Author(s):  
S. Soulayman ◽  
K. Youssef
Keyword(s):  
Combustion Chamber ◽  
Crude Glycerol ◽  
Applied Pressure ◽  
Empirical Method ◽  
Fuel Oil ◽  
Biodiesel Production ◽  
Heavy Fuel Oil ◽  
Fuel Droplets ◽  
Temperature Combustion ◽  
Oil Fuel

In this work the evaporation of the emulsified glycerol- heavy fuel oil (CG-HFO) droplets with different activator is modeled. The influence of activator gas bubbles volume developments on the evaporation of fuel droplets in the high temperature combustion chamber is studied. The crude glycerol as the secondary product of biodiesel production is used as the first component of the emulsion while the second component is heavy fuel oil. The crude glycerol contains methanol, aromatics, minerals, a little bit biodiesel and water. These materials were pressurized and injected in the chamber with three inputs: the first one is for the CG-HFO, the second one is for activator while the third one is for air for forming the emulsion and then passing to the combustion chamber. The applied pressure is determined according to contents which lead to flame stability of the primary formed emulation. A comparison of calculated results, basing on semi-empirical method, with experimental ones demonstrates the modeling acceptable accuracy.

Investigation of Low Temperature Combustion Regimes of Biodiesel With n-Butanol Injected in the Intake Manifold of a Compression Ignition Engine

2012 ◽  
Author(s):  
Valentin Soloiu ◽  
Marvin Duggan ◽  
Henry Ochieng ◽  
David Williams ◽  
Gustavo Molina ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Release ◽  
Combustion Chamber ◽  
Nox Reduction ◽  
Intake Manifold ◽  
Power Stroke ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Temperature Combustion

In this study, the in-cylinder soot and NOx trade off was investigated in a Compression Engine by implementing Premixed Charge Compression Ignition (PCCI) coupled with Low Temperature Combustion (LTC) for selected regimes of 1–3 bars IMEP. In order to achieve that, an omnivorous (multi-fuel) single cylinder diesel engine was developed by injecting n-butanol in the intake port while being fueled with biodiesel by direct injection in the combustion chamber. By applying this methodology, the in-cylinder pressure decreased by 25% and peak pressure was delayed in the power stroke by about 8 CAD for the cycles in which the n-butanol was injected in the intake manifold at the engine speed of 800 rpm and low engine loads, corresponding to 1–3 bars IMEP. Compared with the baseline taken with ultra-low sulfur diesel no. 2 (USLD#2), the heat release presented a more complex shape. At 1–2 bars IMEP, the premixed charge stage of the combustion totally disappeared and a prolonged diffusion stage was found instead. At 3 bars IMEP, an early low temperature heat release was present that started 6 degrees (1.25 ms) earlier than the diesel reference heat release with a peak at 350 CAD corresponding to 1200 K. Heat losses from radiation of burned gas in the combustion chamber decreased by 10–50% while the soot emissions showed a significant decrease of about 98%, concomitantly with a 98% NOx reduction at 1 IMEP, and 77% at 3 IMEP, by controlling the combustion phases. Gaseous emissions were measured using an AVL SESAM FTIR and showed that there were high increases in CO, HC and NMHC emissions as a result of PCCI/LTC strategy; nevertheless, the technology is still under development. The results of this work indicate that n-butanol can be a very promising fuel alternative including for LTC regimes.

Ignition Characteristics of Diesel and Canola Biodiesel Sprays in the Low-Temperature Combustion Regime

2011 ◽  
Vol 25 (7) ◽  
pp. 2896-2908 ◽  
Author(s):  
Casey M. Allen ◽  
Elisa Toulson ◽  
David L. S. Hung ◽  
Harold Schock ◽  
Dennis Miller ◽  
...  
Keyword(s):  
Low Temperature ◽  
Combustion Regime ◽  
Low Temperature Combustion ◽  
Temperature Combustion ◽  
Ignition Characteristics

scholarly journals Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions

Energies ◽  
2017 ◽  
Vol 10 (8) ◽  
pp. 1109 ◽  
Author(s):  
Zhaowen Wang ◽  
Shang Wu ◽  
Yuhan Huang ◽  
Yulin Chen ◽  
Shuguo Shi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Combustion ◽  
Temperature Combustion ◽  
Ignition Characteristics

Investigation of Low Temperature Combustion Regimes of Biodiesel With N-Butanol Injected in the Intake Manifold of a Compression Ignition Engine

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Valentin Soloiu ◽  
Marvin Duggan ◽  
Henry Ochieng ◽  
David Williams ◽  
Gustavo Molina ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Release ◽  
Combustion Chamber ◽  
Nox Reduction ◽  
Intake Manifold ◽  
Power Stroke ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Temperature Combustion

In this study, the in-cylinder soot and NOx trade off was investigated in a compression engine by implementing premixed charge compression ignition (PCCI) coupled with low temperature combustion (LTC) for selected regimes of 1–3 bars IMEP. In order to achieve that, an omnivorous (multifuel) single cylinder diesel engine was developed by injecting n-butanol in the intake port while being fueled with biodiesel by direct injection in the combustion chamber. By applying this methodology, the in-cylinder pressure decreased by 25% and peak pressure was delayed in the power stroke by about 8 CAD for the cycles in which the n-butanol was injected in the intake manifold at the engine speed of 800 rpm and low engine loads, corresponding to 1–3 bars IMEP. Compared with the baseline taken with ultra-low sulfur diesel no. 2 (USLD#2), the heat release presented a more complex shape. t 1–2 bars IMEP, the premixed charge stage of the combustion totally disappeared and a prolonged diffusion stage was found instead. At 3 bars IMEP, an early low temperature heat release was present that started 6 deg (1.25 ms) earlier than the diesel reference heat release with a peak at 350 CAD corresponding to 1200 K. Heat losses from radiation of burned gas in the combustion chamber decreased by 10–50% while the soot emissions showed a significant decrease of about 98%, concomitantly with a 98% NOx reduction at 1 IMEP, and 77% at 3 IMEP, by controlling the combustion phases. Gaseous emissions were measured using an AVL SESAM FTIR and showed that there were high increases in CO, HC and NMHC emissions as a result of PCCI/LTC strategy; nevertheless, the technology is still under development. The results of this work indicate that n-butanol an be a very promising fuel alternative including for LTC regimes.

Preparation and Spectroscopy Analysis of Spinel CoCr2-xAlxO4 by Low-temperature Combustion Synthesis

2011 ◽  
Vol 26 (3) ◽  
pp. 285-289 ◽  
Author(s):  
Dong-Sheng HU ◽  
Ai-Jun HAN ◽  
Ming-Quan YE ◽  
Hou-He CHEN ◽  
Wei ZHANG
Keyword(s):  
Low Temperature ◽  
Combustion Synthesis ◽  
Low Temperature Combustion ◽  
Spectroscopy Analysis ◽  
Temperature Combustion
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