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Effects of varying composition of biogas on performance and emission characteristics of compression ignition engine using exergy analysis

机译：利用（火用）分析改变沼气组成对压缩点火发动机性能和排放特性的影响。

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Growing energy demands and environmental degradation with uncontrolled exploitation of fossil fuels have compelled the world to look for the alternatives. In this context, biogas is a promising candidate, which can easily be utilized in IC engines for vehicular as well as decentralized power generation applications. Primary constituents of raw biogas are methane (CH4) that defines its heating value, and carbon dioxide (CO2) that acts like a diluent. This dilution effect reduces the flame speed and heating value of biogas, eventually deteriorating the engine performances. Present article focuses on experimental evaluation and quantification of these variations of the engine performance. Three compositions of biogas: BG93, BG84 and BG75 (containing 93%, 84% and 75% of CH4 by volume respectively) were studied on a small CI engine in dual fuel mode. Moreover, to evaluate individual process inefficiencies, exergy analysis based on second-law of thermodynamics is implemented. Exergy balances for different compositions of biogas are presented. Biogas dual fuel operation showed 80-90% diesel substitution at lower engine loads. At higher loads, total irreversibility of the engine was increased from 59.56% for diesel operation to 61.44%, 64.18% and 64.64% for BG93, BG84 and BG75 biogas compositions respectively. Furthermore, combustion irreversibility was found to be decreasing with higher CO2 concentrations in biogas. BG93 showed comparable results to that of diesel operation with 26.9% and 27.4% second-law efficiencies respectively. (C) 2017 Elsevier Ltd. All rights reserved.
机译：不断增长的能源需求和环境退化以及对化石燃料的无节制开采，迫使世界范围内寻找替代品。在这种情况下，沼气是有前途的候选者，可以很容易地将其用于车辆以及分散式发电应用的IC引擎中。原始沼气的主要成分是定义其热值的甲烷（CH4）和像稀释剂一样起作用的二氧化碳（CO2）。这种稀释作用降低了火焰速度和沼气的热值，最终使发动机性能下降。本文重点关注发动机性能的这些变化的实验评估和量化。在双燃料模式的小型CI发动机上研究了三种沼气成分：BG93，BG84和BG75（分别含有93％，84％和75％的CH4）。此外，为了评估各个过程的效率低下，基于热力学第二定律进行了火用分析。给出了不同组成的沼气的火用平衡。沼气双燃料运行在较低的发动机负荷下显示出80-90％的柴油替代率。在更高的负载下，发动机的总不可逆性从柴油运行的59.56％分别增加到BG93，BG84和BG75沼气成分的61.44％，64.18％和64.64％。此外，发现随着沼气中较高的CO2浓度，燃烧不可逆性降低。 BG93的二次法效率分别为26.9％和27.4％，可与柴油操作相媲美。 （C）2017 Elsevier Ltd.保留所有权利。

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