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我们介绍了船用柴油机在节能减排技术领域开展的技术研究,并重点对其未来发展趋势进行了展望。在现在及未来的较长一段时间内,柴油机依然会是民用商船领域的主流动力装置。常用于水面舰艇及高性能船舶的燃气轮机动力装置,具有较好发展前景的风能、太阳能及燃料电池等新能源动力装置目前尚无法取代船用柴油机的统治性地位。而在当前的能源及环境局势影响下,针对船用柴油机开展的节能减排研究则显得尤为重要。 相似文献
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在对国内外船用柴油机动力装置抗冲击技术论述的基础上,分析了柴油机动力装置的抗冲击评估和试验方法,提出了柴油机动力装置抗冲击设计思路和方法,研究成果可应用于船舶设备的抗冲击评估和设计中。 相似文献
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非接触式扭振测量仪是内燃机及其动力装置轴系扭振测量发展的方向 ,但是目前常见的非接触式扭振测量仪对于大型低速船用柴油机轴系的扭振测量尚不适应。为此需对非接触式扭振测量仪进行低速性能改进。本文所研究的就是对现有的非接触式扭振测量仪检测中的某些局限性提出改进措施 ;通过对比实验找到一种比较可行的方案 相似文献
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正随着重油价格的不断攀升,以及欧洲和北美港口排放法规的日益严格,船舶行业对替代燃料的兴趣也越来越大,其中包括甲醇和LPG。运输船使用甲醇和LPG作为燃料已有几年了,并且随着替代燃料基础设施在全球的扩张,船厂还在建造更多的燃料运输船。有LNG运输船使用LNG作为船用燃料在先,甲醇和LPG运输船燃用船载燃料也是可行的,且有方便、相对便宜等优势。 相似文献
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阐述了LPG摩托车的发展及存在的问题。在试验研究的基础上,分析了LPG摩托车进气道气态喷射、进气道液态喷射和缸内液态直接喷射对发动机动力性和排放的影响。提出采用液态喷射可以提高LPG摩托车发动机的动力性,是未来LPG摩托车的发展方向。 相似文献
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The present work aims to investigate numerically the effect of LPG blending on the characteristics of diesel engines subjected to variable compression ratio, injection timing, and engine speed. Three blends of LPG are used, which are 10% LPG + 90% diesel, 20% LPG + 80% diesel, and 30% LPG + 70% diesel. The numerical investigation is carried out using the simulation software Diesel-RK. Increasing the percentage of LPG in diesel starts combustion early where the lowest delay period is recorded for a blend of 30% LPG + 70% diesel 6.36 deg. The combustion pressure and heat release are decreased due to the difference in the heating values of blended fuels. Although the peak energy release for diesel is 0.05458 (1/deg.) at 375 deg. BTDC, it was 0.0542, 0.05424, and 0.0537 (1/deg.) at 375 deg. BTDC for 10%, 20%, 30% LPG, respectively. Diesel with 30% LPG has a higher spray penetration followed by 20% LPG then 10% LPG and diesel come last. The diesel with 10% LPG gives a 5.35% reduction in NOx, while diesel with 20% and 30% LPG emit less NOx emission by 9.05% and 16.5%, respectively. Increasing the percentage of LPG in diesel yields to reduce soot concentration because LPG has lower carbon to hydrogen ratio. The lowest ability to emit smoke is detected for fuel with 30% LPG where a 7.4% reduction is obtained. It is worth noting that blending LPG with diesel can fight the trade-off relation between Soot-NOx as a reduction in both of them is obtained. Based on the results obtained, the blending ratio is 30% LPG. The obtained results are validated with the results of other researchers. 相似文献
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在电喷发动机上燃用LPG的试验研究 总被引:2,自引:0,他引:2
我国的LPG中C4H10(丁烷)含量比较大。在电喷发动机上使用汽油、纯C,H8(丙烷)和75%C3H8 25%C4H10三种燃料进行对比试验。当用纯C3H8代替汽油时发动机功率下降10%,但有害排放物下降5090%。在LPG中当提高C4H10的比例为25%时,发动机功率下降幅度减少,同时有害排放物可继续下降。在我国作为清洁燃料,LPG在电喷发动机上的应用具有广阔的前景。 相似文献
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In this study, the efficiency of an LPG evaporator/regulator (E/R) is investigated on both energy and exergy concept. The E/R, which is a key part of LPG conversion systems that enables gasoline engines to be operated on LPG when desired, has been transformed to a thermal energy storage (TES) system using an adequate amount of phase change material (PCM) to be able to store waste energy of the engine coolant, so that the engine can be operated on LPG rather than gasoline even at cold start to decrease fuel consumption and exhaust emissions. The engine has been tested at idle speed at 4 °C environment temperature. The PCM application provided the engine to be operated on LPG at cold start and increased the efficiency of the E/R in a considerable extent on both energy and exergy bases. It was observed that using PCM in the E/R for thermal storage, the net efficiency differences of the E/R with PCM application reach to the values of 20% and 10%, respectively for the energy and exergy calculations. The net 2nd law efficiencies were lower than the ones that of 1st law with the values of about 11% for gasoline operation, and 8% for LPG operation of the engine. 相似文献
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用一种独特的方法,对液化石油气-柴油双燃料发动机进行了研究。试验结果表明,液化石油气-柴油双燃料发动机可得到与柴油机相类似的性能。控制废气再循环和低负荷时切断液化石油气供应是降低排放的一个较好方法。 相似文献
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摩托车汽油机LPG供气装置的应用研究 总被引:3,自引:0,他引:3
本文介绍了液化石油气(PLG)的特性,针对摩托车汽油机进行了LPG的应用研究工作,对采用纯LPG供气方法的摩托车汽油机LPG供气装置的匹配技术进行了初探索,为其进一步优化匹配提供了技术依据,同时也提出了改进方向。 相似文献
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The vehicle engines having gaseous sequential injection systems of liquefied petroleum gas (LPG) are operated on gasoline until the engine coolant reaches the required temperature because the heat of the engine coolant passing through the evaporator and pressure regulator (E&PR) is not enough to vaporize the LPG that is at liquid phase. Therefore, the fuel economy and the decreasing pollutant emissions emitted to the environment through use of LPG cannot be completely achieved at cold start of the engines. In this study, an E&PR that can store thermal energy was designed by using of phase change material (PCM) in order to overcome cold start problem of E&PR in vehicles operated with LPG. The thermal behavior of the E&PR with PCM was determined at idle operating conditions and the effects of using the E&PR surrounded with PCM on exhaust emissions (HC, CO) were examined. It was observed from the study that the E&PR with PCM can solve the cold start problem of the LPG powered engines. The E&PR surrounded with PCM could start the engine with LPG after the 15 h cooling period of the engine and LPG usage decreased HC and CO emissions by 17.32% and 28.71%, respectively. 相似文献