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首页> 外文期刊>Energy >A comparative study of combustion performance and emissions of dual-fuel engines fueled with natural gas/methanol and natural gas/ gasoline
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A comparative study of combustion performance and emissions of dual-fuel engines fueled with natural gas/methanol and natural gas/ gasoline

机译：用天然气/甲醇和天然气/汽油加油的双燃料发动机燃烧性能和排放的比较研究

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A comparative study on combustion characteristics and performance of a dual-fuel engine fueled with natural gas/methanol and natural gas/gasoline was conducted experimentally. All experiments were performed at an engine speed of 1600 r.rnin(-1) with a brake mean effective pressure of 0.387 MPa. Energy substitution ratio (ESR) was defined as the energy released by methanol or gasoline to the total energy released. Four ESRs namely 0, 19, 33, and 44 % were conducted in this study. The results demonstrated that both methanol and gasoline addition accelerated the burning rate of natural gas, leading to an increased peak cylinder pressure (P-max) and maximum heat release rate (HRRmax). The corresponding crank angle of P-max and HRRmax advanced and approached to top dean center after methanol or gasoline enrichment for the specific spark timing (theta(ig)) and ESR. In addition, as the ESR grew from 0 % to 44 % with a theta(ig) of 25 degrees CA BTDC, the brake thermal efficiency (BTE) increased from 27.3 % to 28.1 % for the natural gas/methanol mixture. In contrast, BTE reduced from 27.3 % to 25.5 % for the natural gas/gasoline mixture. The total hydrocarbon and carbon monoxide emissions of natural gas engines can be lowered by adding methanol and raised by inputting gasoline. (C) 2021 Elsevier Ltd. All rights reserved.
机译：实验进行了用天然气/甲醇和天然气/汽油燃料的双燃料发动机燃烧特性和性能的比较研究。所有实验均以1600 r.RNIN（-1）的发动机速度进行，制动器平均有效压力为0.387MPa。能量替代率（ESR）定义为甲醇或汽油释放到释放的总能量的能量。本研究进行了四次ESR，即0,19,33和44％。结果表明，甲醇和汽油添加加速了天然气的燃烧速率，导致峰值气缸压力（P-MAX）和最大热释放率（HRRMAX）增加。 p-max和hrrmax的相应曲柄角提前和接近甲醇或汽油富集的甲醇或汽油富集，用于特定的火花正时（θ（Ig））和ESR。此外，由于ESR从25摄氏度的THETA（Ig）的0％至44％，因此制动热效率（BTE）从天然气/甲醇混合物的27.3％增加到28.1％。相反，BTE为天然气/汽油混合物的27.3％〜25.5％。通过添加甲醇并通过输入汽油加入并升高，可以降低天然气发动机的总烃和一氧化碳排放。 （c）2021 elestvier有限公司保留所有权利。

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