丁醇同分异构体/汽油混合燃料的燃烧和非常规污染物特性的试验研究

摘要

Effects of butanol isomers on characteristics of combustion and emission were studied on PFI SI engine. Experiments were operated under the condition of 3 and 5 bar brake mean effective pressure (BMEP) engine loads and different equivalence ratios (φ=0.83-1.25) with engine speed of 1200 r/min using blends made of 70 vol.％ gasoline and 30 vol.％ butanol isomers (N30, S30, I30 and T30). The results indicated that compared with gasoline, all butanol isomer blends have higher cylinder pressure. N30 has the highest and most advanced peak pressure, and T30 shows a higher brake specific fuel consumption (BSFC) and lower brake thermal efficiency (BTE). N30 presents a lower UHC emissions and I30 has slightly higher CO emissions than other blends. For unregulated emissions, compared with gasoline, butanol isomer blends have higher acetaldehyde, and N30 produces a higher emission of 1,3-butadiene than other blends. A reduction in benzene, toluene, ethylbenzene and xylene (BTEX) has been found with butanol isomer blends.%本文研究了丁醇同分异构体与汽油混合燃料在进气道喷射的火花点火发动机中的燃烧和排放特性.试验在发动机转速为1200 r/min、发动机负荷为3 bar BMEP和5 bar BMEP以及不同混合气空燃比条件下(φ=0.83～1.25)进行,使用了70％体积比的纯汽油和30％体积比的丁醇同分异构体混合燃料(N30,S30,I30和T30).结果表明,相比于纯汽油,所有的丁醇同分异构体/汽油混合燃料表现出更高的缸内压力,其中N30有最高的缸内压力峰值和最早的缸内压力峰值相位;T30表现出较高的brake燃油消耗率(BSFC)和较低的制动热效率(BTE);相比于其他燃料,N30的UHC排放较低而I30的CO排放较高.在非常规排放物特性方面,相比于纯汽油,丁醇同分异构体/汽油混合燃料有较高的乙醛排放;相比于其他混合燃料,N30的1,3-丁二烯排放较高.使用丁醇同分异构体/汽油混合燃料可以有效地抑制单环芳烃类质(BTEX)的排放.