Clean Technology, Vol.25, No.3, 238-244, September, 2019
온도와 압력의 변화에 따른 석유계 및 바이오항공유의 점화특성 분석
Ignition Characteristics of Petroleum-based and Bio Aviation Fuel According to the Change of Temperature and Pressure
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초록
본 연구에서는 온도와 압력의 변화에 따른 석유계항공유(Jet A-1), 바이오항공유(Bio-6308) 그리고 두 항공유를 50:50 (v:v)으로 혼합한 연료의 점화특성의 변화에 대한 분석을 수행하였다. Combustion research unit (CRU) 장비를 사용하여 각 항공유의 점화지연시간을 측정하였으며, GC/MS 및 GC/FID를 사용하여 각 항공유를 구성하는 화합물에 대한 정성 및 정량적인 분석을 수행하였다. 그 결과, 모든 연료의 경우에서 온도와 압력이 증가할수록 점화지연시간이 짧게 측정 되었으며, 특히 압력보다 온도의 영향을 더 많이 받는 것을 확인하였다. 또한, 모든 측정 조건에서 Jet A-1의 점화지연시간이 가장 길게 측정되었는데 이는 Jet A-1을 약 22.48%의 비율로 구성하는 방향족화합물이 산화되는 과정에서 생성되는 benzyl radical이 구조적으로 매우 안정한 특성을 갖기 때문인 것으로 판단되었다. 이러한 benzyl radical은 negative temperature coefficient (NTC) 구간에 영향을 줄 수 있는 반응을 억제하여, Jet A-1의 경우에서는 온도가 증가함에 따라 점화지연시간이 짧아지는 정도가 감소하는 구간이 없는 것을 확인하였다. Jet A-1과 Bio-6308을 50:50 (v:v)으로 혼합한 연료의 점화특성은 Bio-6308 보다는 Jet A-1과 비슷한 경향을 나타내는 것을 통해 기존의 시스템을 변경하지 않고서도 실제로 적용이 가능함을 확인하였다.
In this study, the ignition characteristics of petroleum-based aviation fuel (Jet A-1), bio aviation fuel (Bio-6308), and blended aviation fuel (50:50, v:v) were analyzed in accordance with change of temperature and pressure. The ignition delay time of each aviation fuel was measured by combustion research unit (CRU) and the compositions of the fuels were analyzed by GC/MS and GC/FID for qualitative and quantitative results. From the results, it was confirmed that the ignition delay times of all aviation fuels were shortened with increasing temperature and pressure. In particular, the effect of temperature was larger than the effect of pressure. Also, the ignition delay time of Jet A-1 was the longest at all measurement conditions, and it was judged that this result is because of the structurally stable characteristics of the benzyl radical generated during the oxidation reaction of the aromatic compound (about 22.48%) in Jet A-1. Also, it was confirmed that Jet A-1 had no section where the degree of shortening of ignition delay time was decreased by increasing temperature, which was because the benzyl radical inhibits the response that can affect the negative temperature coefficient (NTC). The ignition characteristics of blended aviation fuel (50:50, v:v) showed a similar tendency to those of Jet A-1, rather than to those of Bio-6308, so that the blended aviation fuel (50:50, v:v) can be applied to the existing system without any change.
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