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首页> 外文期刊>Transaction of the Hongkong Institute of Engineers >CO, HC and NO{sub}x Emissions Characteristics of a Retrofitted Bi-fuel Natural Gas Engine
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CO, HC and NO{sub}x Emissions Characteristics of a Retrofitted Bi-fuel Natural Gas Engine

机译：改装的双燃料天然气发动机的CO，HC和NO {sub} x排放特征

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摘要

This paper presents the experimental results carried out to evaluate CO, HC and NO{sub}X exhaust emissions and performance characteristics of a computer integrated bi-fuel spark ignition engine that has been retrofitted for two fuels namely, gasoline and compressed natural gas (CNG). The ignition point was optimised for CNG through the external device so that the maximum cylinder pressure occurred at similar as gasoline fuel such as between 10 to 10.50 deg crank angles after top dead centre (TDC). The used engine is a 4-cylinder spark ignition engine that has been operated with steady state condition using engine operating software and data acquisition system called CADET6. An eddy current dynamometer was used to measure engine performance characteristics such as engine brake power and fuel consumption and to give load on engine during measuring emission characteristics. Bosch and Bacharach exhaust gas analysers were used to measure emissions gases such as CO, HC and NO{sub}X. The performance test was done with full throttle condition and corresponding air-fuel (APR) was evaluated. The emissions test was done with fixed load condition for both the fuels. The results show that CNG reduces "15% brake power with 15% to 18% reduction in specific fuel consumption (SFC) as compared to gasoline fuel. This is mainly due to the gases nature of CNG fuel. The emissions results show that CNG reduces CO and HC emissions but increases NO{sub}X emissions. The details about the emissions and performance results with three way catalytic (TWC) converter have been presented and discussed. The results of this experiment will be used to develop of new dedicated natural gas engines.
机译：本文介绍了评估CO，HC和NO {sub} X废气排放的实验结果以及计算机集成的双燃料火花点火发动机的性能特性，该发动机已改装为两种燃料，即汽油和压缩天然气（CNG） ）。通过外部设备为CNG优化了点火点，以使最大气缸压力与汽油燃料相似，例如在上止点（TDC）之后的10至10.50度曲柄角之间。使用的发动机是4缸火花点火发动机，已使用发动机运行软件和称为CADET6的数据采集系统在稳态条件下运行。涡流测功机用于测量发动机性能特征（例如发动机制动功率和燃油消耗），并在测量排放特征时给发动机施加负荷。 Bosch和Bacharach废气分析仪用于测量排放气体，例如CO，HC和NO {sub} X。在全节气门条件下进行了性能测试，并评估了相应的空气燃料（APR）。两种燃料的排放测试均在固定负载条件下进行。结果表明，与汽油燃料相比，压缩天然气降低了“ 15％的制动功率，比燃料消耗（SFC）降低了15％至18％。这主要归因于压缩天然气燃料的气体性质。排放结果表明压缩天然气降低了一氧化碳和碳氢化合物的排放，但会增加NO {sub} X的排放量，并介绍并讨论了三元催化（TWC）转化器的排放量和性能结果的细节，该实验的结果将用于开发新型专用天然气引擎。

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