Twin-Fluid Atomized Spray Combustion of Straight Vegetable Oil at Elevated Pressures

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Yonas Niguse ◽  
Ajay K. Agrawal
Keyword(s):  
Vegetable Oil ◽  
Soot Formation ◽  
Digital Camera ◽  
Chamber Pressure ◽  
Nox Emissions ◽  
Elevated Pressures ◽  
Straight Vegetable Oil ◽  
Fuel Flow ◽  
Analysis Technique ◽  
Swirl Stabilized Combustion

The effect of the chamber pressure on combustion of a twin-fluid-atomized spray of straight vegetable oil (VO) in a swirl stabilized combustion system is experimentally studied. A system with high pressure capabilities was developed, and flame and emissions characteristics of VO are investigated at elevated pressures up to about 5 bars, different heat release rates (HRRs), and atomizing air to liquid ratios (ALR) by mass. An image analysis technique was developed to infer flame and soot characteristics from visual images acquired by a digital camera. An increase in the ALR resulted in improved combustion of VO, characterized by blue flames, lower CO and NOx emissions, and minimal soot formation. For a given fuel flow rate, an increase in the chamber pressure resulted in smaller volume flames with lower CO levels but higher NOx emissions. Compared to diesel, as pressure increased, straight VO flames produced lower NOx and more voluminous flames characterized by distributed combustion with less soot formation. Overall, straight VO could be atomized and combusted at elevated pressures using the twin-fluid atomizer of the present study, and the resulting VO flames exhibited less sensitivity to chamber pressure variations.

Twin-Fluid Atomized Spray Combustion of Straight Vegetable Oil at Elevated Pressures

2017 ◽  
Author(s):  
Yonas G. Niguse ◽  
Ajay K. Agrawal
Keyword(s):  
Vegetable Oil ◽  
Soot Formation ◽  
Digital Camera ◽  
Chamber Pressure ◽  
Nox Emissions ◽  
Elevated Pressures ◽  
Straight Vegetable Oil ◽  
Fuel Flow ◽  
Analysis Technique ◽  
Swirl Stabilized Combustion

The effect of the chamber pressure on combustion of a twin-fluid-atomized spray of straight vegetable oil (VO) in a swirl stabilized combustion system is experimentally studied. A system with high pressure capabilities was developed, and flame and emissions characteristics of VO are investigated at elevated pressures, up to about 5 bars, different heat release rates and atomizing air to liquid ratios (ALR) by mass. An image analysis technique was developed to infer flame and soot characteristics from visual images acquired by a digital camera. An increase in the ALR improved combustion characterized by blue flames, lower CO and NOx emissions, and minimal soot formation. For a given fuel flow rate, an increase in the chamber pressure resulted in smaller volume flames with lower CO levels but higher NOx emissions. Compared to diesel, as pressure increased, straight VO flames produced lower NOx and more voluminous flames characterized by distributed combustion with less soot formation. Overall, straight VO could be atomized and combusted at elevated pressures using the twin-fluid atomizer of the present study, and the resulting VO flames exhibited less sensitivity to chamber pressure variations.

scholarly journals An evaluation of the life cycle cost of rapeseed oil as a straight vegetable oil fuel to replace petroleum diesel in agriculture

2011 ◽  
Vol 35 (8) ◽  
pp. 3687-3697 ◽  
Author(s):  
Grau Baquero ◽  
Bernat Esteban ◽  
Jordi-Roger Riba ◽  
Antoni Rius ◽  
Rita Puig
Keyword(s):  
Life Cycle ◽  
Vegetable Oil ◽  
Life Cycle Cost ◽  
Rapeseed Oil ◽  
Straight Vegetable Oil ◽  
Oil Fuel

Model Analysis of Syngas Combustion and Emissions for a Micro Gas Turbine

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Chi-Rong Liu ◽  
Hsin-Yi Shih
Keyword(s):  
Gas Turbine ◽  
Flow Rate ◽  
Heat Input ◽  
Emission Characteristics ◽  
Nox Emissions ◽  
Fuel Flow Rate ◽  
Micro Gas Turbine ◽  
Fuel Flow ◽  
Temperature Distributions ◽  
Flame Structures

The purpose of this study is to investigate the combustion and emission characteristics of syngas fuels applied in a micro gas turbine, which is originally designed for a natural gas fired engine. The computation results were conducted by a numerical model, which consists of the three-dimension compressible k–ε model for turbulent flow and PPDF (presumed probability density function) model for combustion process. As the syngas is substituted for methane, the fuel flow rate and the total heat input to the combustor from the methane/syngas blended fuels are varied with syngas compositions and syngas substitution percentages. The computed results presented the syngas substitution effects on the combustion and emission characteristics at different syngas percentages (up to 90%) for three typical syngas compositions and the conditions where syngas applied at fixed fuel flow rate and at fixed heat input were examined. Results showed the flame structures varied with different syngas substitution percentages. The high temperature regions were dense and concentrated on the core of the primary zone for H2-rich syngas, and then shifted to the sides of the combustor when syngas percentages were high. The NOx emissions decreased with increasing syngas percentages, but NOx emissions are higher at higher hydrogen content at the same syngas percentage. The CO2 emissions decreased for 10% syngas substitution, but then increased as syngas percentage increased. Only using H2-rich syngas could produce less carbon dioxide. The detailed flame structures, temperature distributions, and gas emissions of the combustor were presented and compared. The exit temperature distributions and pattern factor (PF) were also discussed. Before syngas fuels are utilized as an alternative fuel for the micro gas turbine, further experimental testing is needed as the modeling results provide a guidance for the improved designs of the combustor.

scholarly journals Descriptive Statistical Analysis of Vegetable Oil Combustion in a Commercial Burner to Establish Optimal Operating Conditions

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2372 ◽  
Author(s):  
Julio San José ◽  
Yolanda Arroyo ◽  
María Ascensión Sanz-Tejedor
Keyword(s):  
Vegetable Oil ◽  
Combustion Process ◽  
Operating Conditions ◽  
Pollutant Emissions ◽  
Airflow Rate ◽  
Optimal Operating ◽  
Combustion Performance ◽  
Fuel Flow ◽  
Oil Fuel ◽  
Descriptive Statistical Analysis

This article studies the combustion of refined sunflower, virgin sunflower and virgin rapeseed oils in a low-pressure auxiliary air fluid pulverization burner in order to establish the optimal operating conditions. The influence of varying the type of vegetable oil, fuel flow rate and secondary airflow rate in the combustion process was analyzed. These three factors are independent in the combustion process, which means having to carry out numerous assays, combining the various factors with one another. Given the amount of variables to be optimized and the existence of three factors, a statistical approach is adopted to help interpret the results obtained and to evaluate how each factor influences the combustion results. Optimal combustion is determined based on three criteria, minimum pollutant emissions (CO, NOx and CxHy), maximum combustion performance, and minimum excess air. The result of this study showed that airflow was the principal factor affecting emissions, whereas for combustion performance, both factors (airflow and fuel flow) were determinant. In general, admissible combustion performances were obtained, with CO and NOx emissions below permitted levels. The best combustion performance was achieved under conditions of maximum fuel flow and minimum airflow rates.

PAHs and soot formation in laminar partially premixed co-flow flames fuelled by PRFs at elevated pressures

2019 ◽  
Vol 206 ◽  
pp. 363-378 ◽  
Author(s):  
Shuai Liang ◽  
Zhongshan Li ◽  
Jinlong Gao ◽  
Xiao Ma ◽  
Hongming Xu ◽  
...  
Keyword(s):  
Soot Formation ◽  
Elevated Pressures ◽  
Partially Premixed
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