共查询到18条相似文献,搜索用时 156 毫秒
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基于一台由缸内直喷汽油机改装而成的高压缩比双燃料汽油机,研究了甲醇-汽油双燃料喷射方式(M-G,是指进气道喷射甲醇,缸内直喷汽油)和汽油-甲醇双燃料喷射方式(G-M,是指进气道喷汽油,缸内直接喷甲醇)两种双燃料双喷方式对火花点火发动机燃烧排放特性、热效率和爆震抑制的影响。在试验过程中甲醇的喷射比例范围为0~100%。试验结果表明:相比于汽油单燃料发动机,两种双燃料喷射方式(M-G和G-M)都能够显著提高经济性、抑制爆震同时降低微粒排放;G-M双燃料喷射方式相比M-G双燃料喷射方式在抑制爆震、降低微粒排放上效果更加显著。 相似文献
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本文对CA6102汽油机改装成汽油-天然气两用燃料发动机的燃料供给系统所采用的方案进行了详细的介绍,并且对燃用双种燃料发动机的性能进行了试验研究和较深入地分析与论述。 相似文献
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《内燃机工程》2014,(5)
传统Bosch燃油系统改装的DME/柴油双燃料供给系统在实际应用中存在高压燃油泵腔内DME燃料的"气化"现象,这种气化现象会导致燃料供给系统的供油量严重不均和产生"气阻",有一种简单的旁通单向阀技术方案,可消除Bosch燃油泵腔的DME气化现象。分别采用AVL-HYDSIM仿真软件建立DME/柴油双燃料Bosch供给系统和旁通单向阀双燃料系统的仿真模型。仿真研究结果表明:传统DME/柴油双燃料供给系统的Bosch泵腔不可避免存在严重的气化现象;气化现象是由于Bosch燃油泵的结构所致,泵前双燃料的供给压力、双燃料中DME燃料比例、改变泵腔温度/燃料温度等措施无法消除DME气化现象;旁通单向阀方案能够有效消除Bosch泵腔的DME气化现象;旁通单向阀方案具有简单有效、极低成本、便于实际应用推广的特点。 相似文献
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液化石油气比其它气体燃料热值高又便于储存运输。它是一种优良的民用燃料,也是点燃式发动机理想的代用燃料。由于各种原因,我国在车辆上使用液化石油气的工作开展不广。为了更合理有效地利用液化石油气资源,作者探索在柴油发电机组上燃用液化石油气,将柴油机改装成液化石油气-柴油双燃料发动机。本文介绍了这种发动机双燃料供给系统的方案以及在2135柴油发电机组上进行试验的情况。 相似文献
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甲醇火焰可见度低,因此就带来了使用中的安全性问题.作者采用一种实验室方法,对火焰的照度进行测量,从而提供了甲醇燃料火焰可见度的评估基础.对甲醇、柴油、汽油、正庚烷、异辛烷、甲苯及甲醇混合燃料共十二种燃料进行了研究,提供了不同燃料的火焰高度、燃烧速度及火焰照度的定量结果.纯甲醇火焰的照度约为汽油的千分之一,用汽油作添加剂可以提高甲醇火焰的照度,但在燃烧过程中随汽油的蒸发而照度下降.作者建议用着火一分钟后,测量期2秒内照度的平均值L与标准偏差σ的和L+σ作为评价可见度的参数. 相似文献
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本文从甲醇的资源、可获得性、运输性和在柴油机上采用甲醇/柴油组合燃烧后的燃料费用及其对有害物质与温室气体排放影响等多个角度,全面阐述用甲醇替代柴油的可行性,并指出用甲醇替代柴油不仅可以缓解柴油供应紧张,而且有利于调节不合理柴汽比,同时为国家实施立足于自身资源、多元化发展的能源战略提供更合理的途径。 相似文献
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甲醇在柴油机上应用的技术进展 总被引:1,自引:1,他引:1
在我国石油供应缺口较大的情况下,需求结构也不尽合理,柴油消耗量大,柴汽比过高。因此,发展石油替代燃料应以替代柴油为重点目标。天津大学提出了一种甲醇/柴油组合燃烧方式,在柴油机上的试验结果表明,可以实现不到1.5kg甲醇替换1.0kg柴油,甲醇对柴油的替代率平均达到20%以上,同时可以减少微粒和NOx排放,将原发动机的排放品质提高1个等级。以甲醇替代柴油,在能源多元化、节能减排、燃料能源结构调整等方面是有利的,同时还可以提高发动机高原动力,发挥我国现有甲醇产能。我国对甲醇作为燃料在认识上存在较大误区,但长期的实践和研究结果表明,与汽油、柴油相比,甲醇的毒性与之相当;其排放物是清洁的;甲醇对生态环境更友好;使用更安全;甲醇对材料的腐蚀性完全可以得到根本解决;甲醇在燃烧时排出的温室气体少于汽油、柴油,与柴油或汽油一起燃烧更有利于减少温室气体排放。建议国家对甲醇在压燃式发动机上应用给予一定支持,开展相关的基础研究。 相似文献
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This work presents a new fuel sensor-less control scheme for liquid feed fuel cells that is able to control the supply to a fuel cell system for operation under dynamic loading conditions. The control scheme uses cell-operating characteristics, such as potential, current, and power, to regulate the fuel concentration of a liquid feed fuel cell without the need for a fuel concentration sensor. A current integral technique has been developed to calculate the quantity of fuel required at each monitoring cycle, which can be combined with the concentration regulating process to control the fuel supply for stable operation. As verified by systematic experiments, this scheme can effectively control the fuel supply of a liquid feed fuel cell with reduced response time, even under conditions where the membrane electrolyte assembly (MEA) deteriorates gradually. This advance will aid the commercialization of liquid feed fuel cells and make them more adaptable for use in portable and automotive power units such as laptops, e-bikes, and handicap cars. 相似文献
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This work presents a novel fuel sensor-less control scheme for a liquid feed fuel cell system that operates under dynamic loading conditions and is suitable for portable power sources. The proposed technique utilizes the operating characteristics of a fuel cell, such as voltage, current and power, to control the supply of liquid fuel and regulate its concentration. As verified by systematic experiments, this scheme controls effectively the supply of fuel under dynamic loading conditions and pushes the system toward higher power output. The primary features and advantages of sensor-less fuel control are as follows. When the fuel concentration sensor is excluded, the cost of a liquid feed fuel cell system is decreased and system volume and weight are reduced, thereby increasing specific energy density and design simplicity, and shortening system response time. Notably, temperature compensation for measurement data is unnecessary. With a decreased number of components, the control scheme improves durability and reliability of liquid feed fuel cells. These advantages will help commercialization of liquid feed fuel cells as portable power sources. 相似文献
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The whole life of methanol fuel, produced by microalgae biomass which is a kind of renewable energy, is evaluated by using a method of life cycle assessment (LCA). LCA has been used to identify and quantify the environment emissions and energy efficiency of the system throughout the whole life cycle, including microalgae cultivation, methanol conversion, transport, and end-use. Energy efficiency, defined as the ratio of the energy of methanol produced to the total required energy, is 1.24, the results indicate that it is plausible as an energy producing process. The environmental impact loading of microalgae-based fuel methanol is 0.187mPET2000 in contrast to 0.828mPET2000 for gasoline. The effect of photochemical ozone formation is the highest of all the calculated categorization impacts of the two fuels. Utilization of microalgae an raw material of producing methanol fuel is beneficial to both production of renewable fuels and improvement of the ecological environment. This Fuel methanol is friendly to the environment, which should take an important role in automobile industry development and gasoline fuel substitute. 相似文献