摘要
煤通过FischerTropsch(FT)合成可得到十六烷值高、硫和芳香烃质量分数极低的FT柴油。研究分析了未作改动的单缸直喷式柴油机燃用FT柴油时的燃烧和排放特性。结果表明,与燃用0号柴油相比,燃用FT柴油时的滞燃期平均缩短18.7%,预混燃烧放热峰值降低26.8%,扩散燃烧放热峰值较高,燃烧持续期相当。燃用FT柴油时的最高燃烧压力略低,最大压力升高率显著下降,机械损失和燃烧噪音较小,燃油消耗率和热效率都得到显著改善。燃用FT柴油可同时降低CO、HC、NOx和炭烟排放,其中NOx和炭烟分别平均降低16.7%和40.3%。研究表明,FT柴油是柴油机良好的清洁代用燃料。
Through Fischer-Tropsch （F-T） synthetic process, coal can be converted to F-T diesel fuel that has high cetane number, very low sulfur and aromatic contents. This paper presents the research results of an unmodified single-cylinder direct injection diesel engine operating on F-T diesel fuel. The indicated pressure diagrams and injector needle lifts were recorded and the combustion and emission characteristics were evaluated and compared with those of conventional diesel fuel operation. The results showed that F-T diesel fuel exhibits a 18.7% average shorter ignition delay, a 26.8% average lower peak value of premixed burning rate, a higher maximum diffusive burning rate and a comparable total combustion duration when compared to conventional diesel fuel. In addition, F-T diesel engine has a slightly lower peak combustion pressure, a far lower rate of pressure rise, and a lower mechanical load and combustion noise. The brake specific fuel consumption is lower and the effective thermal efficiency is higher for F-T diesel fuel operation. CO, HC, NOx and smoke emissions with F-T diesel fuel are reduced at all test speed-load points when compared to conventional diesel fuel. On average, NOx and smoke emissions are reduced by 16.7% and 40.3% respectively with F-T diesel fuel. The study demonstrates that F-T diesel fuel is an excellent clean alternative fuel for diesel engines.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2005年第4期492-496,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(50306020)~~
关键词
F—T柴油
清洁代用燃料
直喷式柴油机
燃烧
排放
F-T diesel fuel
clean alternative fuel
direct injection diesel engine
combustion
emission
作者简介
黄勇成（1973-），男，湖北鄂州人，副教授，博士，研究内燃机代用燃料燃烧与排污控制。E-mail：huangyc@mail．xjtu．edu．cn。
