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对二甲醚-柴油混合燃料影响发动机性能的稳定性、黏度这两种理化性质进行了研究。通过对不同比例混合燃料的互溶性、黏度等理化性质的测试和研究,得出了在二甲醚中掺加柴油不仅能使两种燃料混合均匀、稳定性好,而且可以有效提高燃料的黏度,降低发动机精密偶件的磨损,提高发动机的工作可靠性。 相似文献
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柴油/二甲醚在柴油机上的性能与排放研究 总被引:1,自引:0,他引:1
二甲醚(DME)是一种重要的超清洁能源产品,文中分析了二甲醚的理化特性,并在D1110柴油机上掺烧D90(二甲醚柴油质量分数比9:1),结果表明:功率和转矩略低于原柴油机,PM排放大幅度下降,NOX在整个负荷范围内得到控制。结果体现了柴油机燃用二甲醚柴油混合燃料在降低排放方面的优越性能。 相似文献
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二甲醚(DME)是一种重要的超清洁能源产品,文中分析了二甲醚的理化特性,并在D1110柴油机上掺烧D90(二甲醚柴油质量分数比9:1),结果表明:功率和转矩略低于原柴油机,PM排放大幅度下降,NOx在整个负荷范围内得到控制.结果体现了柴油机燃用二甲醚柴油混合燃料在降低排放方面的优越性能. 相似文献
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2010年,燃料价格高位运行,发电厂燃料成本压力继续增大,章丘发电有限公司抓住机遇调整煤种结构,积极探索掺配掺烧褐煤的方式,形成了一套适应当前符合自身特点的较为完善的褐煤掺配掺烧方案,在保证安全生产的同时,大大降低了燃料成本,取得了良好的经济效益。 相似文献
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在一台改装的单缸气体发动机上进行缸内直喷不同CH4/N2配比的混合燃料发动机掺氢燃烧负荷特性的试验,研究不同负荷下混合燃料中掺氢比和掺氮比对发动机动力性、排放性以及经济性的影响。研究结果表明,当混合气体燃料中氮气体积分数不同时,不同负荷区域,掺入氢气对缸内最大爆发压力影响不同。结果显示,掺氮25%燃料CO排放较掺氮15%的明显增大,且当不掺氢时,增长近30%,并且掺氢对减小HC排放有利,但氢气对不同氮气比燃料CO排放与NOx排放影响不同,对于掺氮15%燃料,掺氢10%后,CO排放升高,NOx排放降低,而对于掺氮25%燃料掺氢后CO排放降低,NOx排放升高。另外,随着负荷增大,有效燃气消耗率呈逐渐减小的趋势,而且掺氢有利于热效率的提高。 相似文献
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非集中供应燃煤的火力发电厂供煤通常采用典型的“小煤保大电”模式。此种供煤模式由于近年来煤炭市场变化复杂和掺烧煤种多样,严重影响到机组的安全、环保、经济运行。鉴于以上所述亟待解决的问题,在遵循安全可靠、经济环保、煤场烧旧存新等原则的前提下,研究拟定将不同热值、挥发分、硫分及其他需求指标的煤种进行叠加配煤,利用各种煤在性质上的差异,相互“取长补短”,发挥各掺配煤种的优点,最终使配出的混合煤在综合性能上达到“最佳性能状态”。本文分析了叠加配煤法在某火电厂燃煤掺烧中的应用,经应用实践得出:叠加配煤法可以实现燃煤掺烧的精细化,同时为常规煤粉炉安全、经济、环保掺烧提供了保障,此外也实现了高比例掺烧低质煤的可行之路,可直接推广应用于省内外煤种较复杂的各火电企业,有较好的应用前景。 相似文献
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介绍了柴油引燃甲醇双燃料燃烧对柴油机动力性和经济性的影响。在1台单缸、直喷、中冷柴油机上采用柴油引燃甲醇双燃料进行试验。结果显示甲醇柴油双燃料发动机在中高负荷及中高转速下运转可获得较好的燃油经济性。选择适当的引燃柴油量,双燃料发动机的动力性可以达到甚至超过原柴油的动力性。 相似文献
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Yao Chunde Yao Guangtao Song Jinou Wang Yinshan State Key Laboratory of Engine Combustion Tianjin University Tianjin China 《机械工程学报(英文版)》2005,18(1):25-29
Numerical simulations of pilot fuel spray and compressing ignition for pre-mixed natural gas ignited by pilot diesel are described. By means of these modeling, the dual fuel and diesel fuel ignition mechanism of some phenomena investigated on an optional engine by technology of high-speed CCD is analyzed. It is demonstrated that the longer delay of ignition in dual fuel engine is not mainly caused by change of the mixture thermodynamics parameters. The analysis results illustrate that the ignition of pre-mixed natural gas ignited by pilot diesel taking place in dual fuel engine is a process of homogenous charge compression ignition. 相似文献
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Quantitative vapor phase exciplex fluorescence measurements at high ambient temperature and pressure
The exciplex fluorescence technique with the TMPD (tetamethyl-p-phenylene-diamine) / naphthalene dopant system was applied in a combustion-type constant-volume spray chamber. A detailed
set of calibration experiments has been performed in order to quantify the TMPD fluorescence signal. It has been demonstrated
that the TMPD fluorescence intensity was directly proportional to concentration, was independent of the chamber pressure,
and was not sensitive to quenching by either water vapor or carbon dioxide. Using a dual heated-jet experiment, the temperature
dependence of TMPD fluorescence up to 1000 K was measured. The temperature field in the spray images was determined using
a simple mixing model, and an iterative solution method was used to determine the concentration and temperature field including
the additional effects of the laser sheet extinction. The integrated fuel vapor concentration compared favorably with the
measured amount of injected fuel when all of the liquid fuel had evaporated. 相似文献
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Bhupendra Singh Chauhan Naveen Kumar Haeng Muk Cho 《Journal of Mechanical Science and Technology》2010,24(2):529-535
Diesel engines have proven their utility in the transportation, agriculture, and power sectors in India. They are also potential
sources of decentralized energy generation for rural electrification. Concerns on the long-term availability of petroleum
diesel and the stringent environmental norms have mandated the search for a renewable alternative to diesel fuel to address
these problems. Vegetable oils have been considered good alternatives to diesel in the past couple of years. However, there
are many issues related to the use of vegetable oils in diesel engine. Jatropha curcas has been promoted in India as a sustainable
substitute to diesel fuel. This study aims to develop a dual fuel engine test rig for evaluating the potential suitability
of Jatropha oil as diesel fuel and for determining the performance and emission characteristics of an engine with Jatropha
oil. The experimental results suggest that engine performance using Jatropha oil is slightly inferior to that of diesel fuel.
The thermal efficiency of the engine was lower, while the brake-specific fuel consumption was higher with Jatropha oil compared
with diesel fuel. The levels of nitrogen oxides (NOx) from Jatropha oil during the entire duration of the experiment were
lower than those of diesel fuel. The reduction of NOx was found to be an important characteristic of Jatropha oil as NOx emission
is the most harmful gaseous emission from engines; as such, its reduction is always the goal of engine researchers and makers.
During the entire experiment, carbon monoxide (CO), hydrocarbon (HC), and carbon dioxide (CO2) emissions in the case of using Jatropha oil were higher than when diesel fuel was used. The higher density and viscosity
of Jatropha oil causes lower thermal efficiency and higher brakespecific fuel consumption. The performance and emission characteristics
found in this study are significant for the study of replacing diesel fuel from fossils with Jatropha oil in rural India,
where the availability of diesel has always been a problem. 相似文献
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介绍了柴油引燃甲醇双燃料燃烧对柴油机CH、NOx和碳烟排放的影响。采用柴油引燃甲醇双燃料在一台单缸、直喷、中冷柴油机上进行。随着甲醇质量分数的增加,HC排放迅速增加,NOx排放减少,发动机碳烟排放大幅度降低。 相似文献
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概述LPG燃料的特性及使用LPG作燃料的发动机的优点,重点介绍了1—3t叉车上采用的尼桑H系列汽油机与美国IMPCO LPG转换装置配套的汽油/LPG双燃料系统。 相似文献
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等效因子离散全局优化的等效燃油瞬时消耗最小策略能量管理策略* 总被引:9,自引:0,他引:9
以一款混联插电式混合动力汽车(Plug-in hybrid electric vehicle, PHEV)的燃油经济性为研究目标,为改善以等效因子为核心的等效燃油瞬时消耗最小策略(Equivalent fuel consumption minimization strategy, ECMS)的控制效果,考虑电池荷电状态(State of charge, SOC)、等效因子与燃油消耗的关系,构建等效因子全局优化模型;利用遗传算法离线优化一定工况下的等效因子S ,得到不同电消耗续航行驶里程与电池SOC初始值的最佳等效因子MAP图,建立基于等效因子优化的ECMS能量管理策略,并考虑动力电池、电动机等部件的效率,获得最佳等效因子下的发动机、ISG电机、驱动电机的功率分配,并进 行仿真与硬件在环试验,其中仿真结果表明,与未优化的等效因子相比,燃油经济性提高20.81%,硬件在环试验结果与 仿真结果基本一致,表明所制定能量管理策略的有效性和可行性,进而为解决不同的行驶里程PHEV功率分配策略提供理论基础。 相似文献