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在一台满足国三排放法规要求的重载车用增压中冷电控单体泵柴油机上,将其改造成柴油/甲醇组合燃烧(DMCC)发动机并进行台架试验.利用电控单元控制向进气歧管喷射的甲醇量及其喷射时刻,原柴油机供油系统保持不变.试验主要研究在稳定工况时,不同的负荷以及不同的甲醇对柴油的比例情况下,经催化转化后发动机干炭烟烟度(415烟度)和不透光烟度(439烟度)排放的情况.试验结果表明,在燃用现有市售的燃油条件下,与原机相比,相同工况下采用DMCC的干炭烟烟度和不透光烟度都有大幅度的减少.干炭烟的最大降幅达95%,平均降幅达到50%以上.在柴油喷射量不变的情况下,增加甲醇喷射量,干炭烟烟度会持续减小,而不透光烟度呈先减少后增加的趋势.同负荷时的甲醇对柴油替代率为44.88%到56.73%时,不透光烟度存在最低点,并且发动机的烟度排放存在最优值.在同一工况下,随着柴油对甲醇的比例增加,发动机的干炭烟烟度和不透光烟度排放都逐渐增加.
On a diesel engine with a supercharged intercooled single-charge electric pump for heavy vehicles that meets the requirements of the three emission regulations of China, the diesel engine is retrofitted into a diesel / methanol combined combustion (DMCC) engine and a bench test is carried out. The electric control unit The amount of methanol injected into the intake manifold and its injection time, the original diesel engine oil supply system remains unchanged.The main study in the steady conditions, different loads and different proportions of methanol to diesel, the catalytic conversion Engine dry smoke smoke (415 smoke) and opacity smoke smoke (439 smoke) emissions test results show that the use of existing commercially available fuel conditions, compared with the original machine, the same work Under the condition of using DMCC dry carbon smoke smoke density and opacity have a significant reduction in the maximum decline of dry carbon smoke 95%, an average decline of more than 50% in the case of diesel injection unchanged, Increase the amount of methanol injection, the dry smoke smoke will continue to decrease, while the smoke opacity first decreased and then increased the trend of the same load of methanol to diesel replacement rate of 44.88% to 56.73%, opacity smoke Degree of existence there is the lowest point, and there is the optimal value of the engine smoke emissions in the same operating conditions, The ratio of methanol diesel increased dryness of carbon tobacco smoke and engine exhaust smoke opacity are gradually increased.