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Effect of Air Velocity on Combustion Characteristics in Small-Scale Burner
Laryea, Gabriel Nii,No, Soo-Young The Korean Society of Combustion 2005 한국연소학회지 Vol.10 No.1
This paper presents the combustion characteristics of hydrocarbon fuel from a conventional pressure-swirl nozzle of a small-scale burner. The nozzle has orifice diameters of 0.256 mm and liquid flow rates ranging from 50 to 64 mL/min were selected for the experiments. The furnace temperature distribution along the axial distance, the gas emission such as CO, $CO_2$, NOx, $SO_2$, flue gas temperature, and combustion efficiency were studied. The local furnace and flue gas temperatures decreased with an increase in air velocity. At injection pressures of 1.1 and 1.3 MPa the maximum furnace temperatures occurred closer to the burner exit, at an axial distance of 242 mm from the diffuser tip. The CO and $CO_2$concentrations decreased with an increase in air velocity, but they increased with an increase in injection pressure. The effect of air velocity on NOx was not clearly seen at low injection pressures, but at injection pressure of 1.3 MPa it decreased with an increase in air velocity. The effect of air velocity on $SO_2$ concentration level is not well understood. The combustion efficiency decreased with an increase in air velocity but it increased with an increase in injection pressure. It is recommended that injection pressure less than 0.9 MPa with air velocity not above 8.0 m/s would be suitable for this burner.
Spray and Combustion Characteristics of Hydrocarbon Fuel Injected from Pressure-Swirl Nozzles
( Gabriel Nii Laryea ),( Soo Young No ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.4
This paper presents spray and combustion characteristics of hydrocarbon fuel injected from pressure-swirl nozzles. Three commercial nozzles with orifice diameters of 0.256, 0.308 and 0.333 ㎜ and injection pressures ranging from 0.7 to 1.3 ㎫ were selected for the experiments. Spray characteristics such as breakup length, spray angle and drop size (SMD) were analyzed using photo image analyses and Malvern Particle Size Analyzer. The drop size was measured with and without a blower at the same measuring locations. The flame length and width were measured using photo image analyses. The temperature distribution along the axial distance and the gas emission such as CO, CO₂ and NOx were studied. The breakup length decreased with an increase in injection pressure for each nozzle but increased with an increase in nozzle orifice diameter. The spray angle increased and SMD decreased with an increase in injection pressure. The flame length increased linearly with an increase in injection pressure and in nozzle orifice diameter. The flame temperature increased with an increase in injection pressure but decreased along the axial distance. The maximum temperatures occurred closer to the burner exit and flame at axial distance of 242 mm from the diffuser tip. The experimental results showed that the level of CO decreased while that of CO₂ and NOx increased with an increase in injection pressure and nozzle orifice diameter.
A CHARGE INJECTION ELECTROSTATIC PRESSURE-SWIRL NOZZLE FOR BURNER APPLICATION
Laryea, Gabriel Nii,No, Soo Young 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 2002 연구보고서 Vol.6 No.-
This paper presents an experimental investigation of a charge injection electrostatic pressure swirl nozzle. The work forms part of the design and development of electrospray nozzle for practical oil burner application. The designed nozzle used in the experiment consists of a sharp pointed tungsten wire as a charge injector and the nozzle body grounded. The spray characteristics of the nozzle have been investigated by using a kerosine without active surface agent. The liquid breakup length decreased while the spray angle increased with an increase in applied voltage and injection pressure. An empirical equation to predict the breakup length for electrostatic pressure-swirl nozzle have been suggested. The experimental result was within the range of the predicted equation. An applied voltage of -10 kv result a decreased of the sauter mean diameter (SMD) at different radial distance.
SPRAY AND COMBUSTION CHARACTERISTICS OF HYDROCARBON FUEL INJECTED FROM PRESSURE-SWIRL NOZZLES
Laryea Gabriel Nii,No Soo-Young The Institute for Liquid Atomization and Spray Sys 2004 한국액체미립화학회지 Vol.9 No.4
This paper presents spray and combustion characteristics of hydrocarbon fuel injected from pressure-swirl nozzles. Three commercial nozzles with orifice diameters of 0.256, 0.308 and 0.333mm and injection pressures ranging from 0.7 to 1.3 MPa were selected f9r the experiments. Spray characteristics such as breakup length. spray angle and drop size (SMD) were analyzed using photo image analyses and Malvern Panicle Size Analyzer. The drop size was measured with and without a blower at the same measuring locations. The flame length and width were measured using photo image analyses. The temperature distribution along the axial distance and the gas emission such as CO, $CO_2\;and\;NO_x$ were studied. The breakup length decreased with an increase in injection pressure for each nozzle but increased with an increase in nozzle orifice diameter. The spray angle increased and SMD decreased with an increase in injection pressure. The flame with an increased linearly with an increase in injection pressure and in nozzle orifice diameter. The flame temperature increased with an increase in injection pressure but decreased along the axial distance. The maximum temperatures occurred closer to the burner exit and flame at axial distance of 242mm from the diffuser tip. The experimental results showed that the level of CO decreased while that of $CO_2\;and\;NO_x$ increased with an increase in injection pressure and nozzle orifice diameter.