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Performance optimization of in-cylinder thermochemical fuel reforming (TFR) with compression ratio in an SI natural gas engine

机译：SI天然气发动机中具有压缩比的缸内热化学燃料重整（TFR）性能优化

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摘要

The potential for in-cylinder thermochemical fuel reforming (TFR) to improve engine performance has been well studied. Meanwhile, achievable TFR gas can ensure that an engine coupled with in-cylinder TFR can run at a comparatively high compression ratio (CR), which might facilitate the in-cylinder TFR reforming process and then improve engine performance. This study focuses on performance optimization of in-cylinder TFR with compression ratio. Two compression ratios, of 11 and 13 were selected in the experiment. With the original compression ratio of 11, the brake thermal efficiency rose while the brake specific fuel consumption declined rapidly with increases in the equivalence ratio of the TFR cylinder (UTFR). Thermal efficiency reached a maximum while consumption fell to a minimum when the UTFR reached 1.25, at which point large amounts of H-2 and CO were generated in the reformed gas. In the case of 11 compression ratio, the in-cylinder TFR slightly worsened engine stability if the UTFR exceeded 1.25. When the compression ratio was up to 13, the reformed gas had a higher proportion of CO, with a comparable proportion of H2 compared with lower compression ratio. Meanwhile, thermal efficiency was elevated while fuel consumption was reduced and the engine achieved better stability, with less discrepancy between the cylinders. Moreover, the engine combustion and emissions characteristics were improved. Results also demonstrated that increased compression ratio could extend the scope for high efficiency in-cylinder TFR. Thus, combined with higher compression ratio, TFR has potential to further reduce emissions and to improve brake specific fuel consumption in an SI natural gas engine simultaneously. (C) 2017 Elsevier Ltd. All rights reserved.
机译：缸内热化学燃料重整（TFR）改善发动机性能的潜力已得到充分研究。同时，可获得的TFR气体可以确保与缸内TFR耦合的发动机可以以较高的压缩比（CR）运行，这可能有助于缸内TFR重整过程，从而改善发动机性能。这项研究的重点是通过压缩比优化缸内TFR的性能。在实验中选择了两个压缩比，分别为11和13。原始压缩比为11时，随着TFR气缸（UTFR）的当量比的增加，制动器的热效率上升，而制动器的比油耗迅速下降。当UTFR达到1.25时，热效率达到最大值，而消耗降至最低，此时重整气体中会生成大量H-2和CO。在11压缩比的情况下，如果UTFR超过1.25，则缸内TFR会稍微降低发动机稳定性。当压缩比达到13时，与较低的压缩比相比，重整气体具有较高的CO比例和相当的H 2比例。同时，提高了热效率，同时减少了燃料消耗，并且发动机达到了更好的稳定性，气缸之间的差异也减少了。此外，改善了发动机的燃烧和排放特性。结果还表明增加的压缩比可以扩大高效缸内TFR的范围。因此，结合较高的压缩比，TFR具有进一步减少排放并同时改善SI天然气发动机的制动器特定燃料消耗的潜力。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第1期|162-170|共9页
  • 作者

    Xu Zhen; Zhu Lei; He Zhuoyao; Li Ang; Shao Yu; Huang Zhen;

  • 作者单位

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Key Lab Power Machinery & Engn MOE, Shanghai 200240, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermochemical fuel reforming; Compression ratio; Natural gas engine; Hydrogen; Carbon monoxide;

    机译：热化学燃料重整压缩比天然气发动机氢气一氧化碳;

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