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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >COMBUSTION PERFORMANCE AND UNBURNED HYDROCARBON EMISSIONS OF A NATURAL GAS - DIESEL DUAL FUEL ENGINE AT A LOW LOAD CONDITION
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COMBUSTION PERFORMANCE AND UNBURNED HYDROCARBON EMISSIONS OF A NATURAL GAS - DIESEL DUAL FUEL ENGINE AT A LOW LOAD CONDITION

机译：天然气-柴油双燃料发动机低负荷时的燃烧性能和未燃烧的碳排放。

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摘要

The combustion of natural gas reduces fuel cost and generates less emissions of carbon dioxide and particulate matter than diesel and gasoline. Replacing diesel by natural gas in internal combustion engines is of great interest for transportation and stationary power generation. Dual fuel combustion is an efficient way to burn natural gas in internal combustion engines. In natural gas - diesel dual fuel engines, unburned hydrocarbon emissions increase with increasing natural gas fraction. Many studies have been conducted to improve the performance of natural gas - diesel dual fuel engines and reported the performance of combustion and emissions of regulated pollutants and total unburned hydrocarbon at various engine operating strategies. However, little has been reported on the emissions of different unburned hydrocarbon components. In this paper, an experimental investigation was conducted to investigate the combustion performance and emissions of various unburned hydrocarbon components, including methane, ethane, ethylene, acetylene, propylene, formaldehyde, acetaldehyde and benzaldehyde, at a low engine load condition. The operating conditions, such as engine speed, load, intake temperature and pressure, were well controlled during the experiment. The combustion and emissions performance of pure diesel and natural gas - diesel dual fuel combustion were compared. The effect of diesel injection timing was analyzed. The results show that appropriately advancing diesel injection timing to form a homogeneous charge compression ignition-like combustion is beneficial to natural gas - diesel dual fuel combustion at low load conditions. The emissions of different unburned hydrocarbon components changed in dual fuel combustion, with emissions of some unburned hydrocarbon components being primarily due to the combustion of natural gas, while those of others being more related to diesel combustion.
机译：与柴油和汽油相比，天然气的燃烧降低了燃料成本，并减少了二氧化碳和颗粒物的排放。在运输和固定发电中，用天然气代替内燃机中的柴油是非常重要的。双重燃料燃烧是在内燃机中燃烧天然气的有效方法。在天然气-柴油双燃料发动机中，未燃烧的碳氢化合物排放量随天然气分数的增加而增加。已经进行了许多研究来改善天然气-柴油双燃料发动机的性能，并报告了在各种发动机运行策略下燃烧性能以及受管制污染物和总未燃碳氢化合物的排放量。但是，关于不同的未燃烧碳氢化合物组分的排放的报道很少。在本文中，进行了一项实验研究，以研究在低发动机负荷条件下各种未燃烧的碳氢化合物组分（包括甲烷，乙烷，乙烯，乙炔，丙烯，甲醛，乙醛和苯甲醛）的燃烧性能和排放。在实验过程中，对发动机的转速，负载，进气温度和压力等操作条件进行了很好的控制。比较了纯柴油和天然气的燃烧和排放性能-柴油双燃料燃烧。分析了柴油喷射正时的影响。结果表明，适当提前柴油喷射正时以形成均质充量压缩点火样燃烧，有利于低负荷条件下的天然气-柴油双燃料燃烧。在双燃料燃烧中，不同的未燃烧碳氢化合物组分的排放发生了变化，其中一些未燃烧的碳氢化合物组分的排放主要是由于天然气的燃烧，而其他一些则与柴油燃烧更加相关。

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