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RISS 인기검색어
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- 저자 : ( T. Furuhata ) (검색결과 2 건)
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( T. Furuhata ),( T. Oshima ),( S. Tozuka ),( M. Arai ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
We have paid attention to the ignition behavior of two diesel sprays which were simultaneously injected and interacted with each other after wall impingement. In this study, the effect of fuel injection mass on the ignition behavior of two diesel sprays impinged on a wall and then interacted with each other was investigated experimentally. The combustion equipment consisted of a pressure chamber and electric heaters. High-pressure hot air (3MPa) was charged to the chamber through the electric heaters. The pressure chamber was equipped with two injectors so that two parallel sprays impinged perpendicularly on the impingement wall. The injection pressure was 90MPa. JIS No.2 diesel fuel was used as a test fuel. From the observation of ignition, it was found that the lowest ignition temperature of interacting two sprays decreased with increasing fuel injection mass in the range between 12mg (6mg×2) and 42mg (21mg×2). Appearance positions of luminous flame, OH and C2 radical luminosities appeared in the area where two sprays collided and interacted with each other, and therefore the interaction affected the ignition of the two sprays impinging on the wall. The ignition of two sprays with interaction was sometimes hard to occur compared to the one of impinging single spray owing to the effect of interaction between two sprays when the ignition was occur after fuel injection end.
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( Y. Wu ),( K. Yamamoto ),( H. Wachi ),( T. Furuhata ),( M. Arai ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
Heat recovery from flue gas is very effective to economize fossil fuel, and results in the reduction of CO2 emission. However, the temperature of flue gas decreased with increasing the amount of recovery heat. It is thought that the decrease of temperature causes formation of secondary condensed particles in a flue gas. Furthermore, there is a possibility that sulfur in fuel promotes the formation of those particles when sulfur-contained fuel such as heavy fuel oil is burned. In this study, sulfur-contained kerosene (thiophene (C4H4S) added kerosene; mass fraction of sulfur was 1000ppm) was burned using a spray combustion furnace with long stack, and diameter distributions and compositions of particles in a flue gas were measured in order to understand the formation of secondary condensed particle. A water-cooled heat exchanger was used to cool down the flue gas before stack for the simulation of latent heat recovery. Flue gas was sampled from the stack with a thermal dilution sampling to analyze the characteristics of particles. When the flue gas was gradually and slightly cooled down in the stack, it was found that there was a peak between 10nm and 100nm in the diameter distribution. However, the peak disappeared with the thermal dilution sampling at 150°C or 300°C. It seemed that the disappeared particles were condensed ones such as sulfuric acid mist. When the flue gas was quickly cooled down with the heat exchanger, a similar peak was found with the dilution sampling at room temperature, but the peak did not disappeared and shifted to smaller diameters with the thermal dilution sampling at 150°C or 300°C. This result suggested that condense particles which were hard to evaporate or nano-size solid particles were formed in the process of heat recovery.
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