CAJ | 학술논문

生物质通过快速热解得到的生物质热解燃油主要成分为含氧有机混合物和水,不宜直接作为燃料使用,但与柴油乳化后可实现其在发动机上的应用.在确定生物质热解燃油/柴油乳化油乳化剂的最佳亲水亲油平衡(HLB)值后,利用超声波乳化装置制备了生物质热解燃油质量分数为10%的乳化油(用BPO10表示),然后在一台未作改动的商喷式柴油机上对燃用BPO10 时的燃烧和排放进行了研究.结果表明,生物质热解燃油/柴油乳化油乳化剂的最佳 HLB 值约为5.8.与0号柴油相比,发动机燃用 BPO10 时燃烧始点推迟,预混燃烧放热峰值明显升高,扩散燃烧放热峰值略低,最高燃烧压力较低,燃烧持续期缩短;燃用 BPO10 时有效燃油消耗率较高,而有效热效率与0号柴油的相当;燃用BPO10时可同时大幅降低NO_x和碳烟排放,但HC和CO排放升高.
생물질통과쾌속열해득도적생물질열해연유주요성분위함양유궤혼합물화수,불의직접작위연료사용,단여시유유화후가실현기재발동궤상적응용.재학정생물질열해연유/시유유화유유화제적최가친수친유평형(HLB)치후,이용초성파유화장치제비료생물질열해연유질량분수위10%적유화유(용BPO10표시),연후재일태미작개동적상분식시유궤상대연용BPO10 시적연소화배방진행료연구.결과표명,생물질열해연유/시유유화유유화제적최가 HLB 치약위5.8.여0호시유상비,발동궤연용 BPO10 시연소시점추지,예혼연소방열봉치명현승고,확산연소방열봉치략저,최고연소압력교저,연소지속기축단;연용 BPO10 시유효연유소모솔교고,이유효열효솔여0호시유적상당;연용BPO10시가동시대폭강저NO_x화탄연배방,단HC화CO배방승고.
Biomass pyrolysis oil (BPO) produced through biomass fast pyrolysis process is mainly composed of oxygenated organics and water, thereby restricting its direct use as fuel is essential. However, the use of BPO in diesel engines can be realized by developing emulsions from BPO and diesel fuel. In this paper, the emulsion with 10 wt % BPO in No.0 diesel,represented by BPO10, was produced by using ultrasonic emulsification method after determining the optimum hydrophilic and lipophilic balance (HLB) value of the emulsifier for the emulsions from BPO and diesel. Then, the combustion and emission characteristics of an unmodified direct injection diesel engine operating on BPO10 were studied and compared with those of No.0 diesel operation. The results show that the optimum HLB value of the emulsifier for the emulsions from BPO and diesel is about 5.8. The engine operating on BPO10 exhibits a later combustion start point, displays a higher peak value of premixed burning rate and a slightly lower peak value of diffusion burning rate, and has a lower peak combustion pressure and a shorter combustion duration when compared with No.0 diesel. In addition, the brake specific fuel consumption is higher and the effective thermal efficiency is comparable for BPO10 operation. NO_x and smoke emissions with BPO10 were reduced significantly, while HC and CO emissions were increased when compared with those of No.0 diesel operation.