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Evaluation of operating parameters and fuel composition on knock in large bore two-stroke pipeline engines

机译：大口径二冲程管道发动机爆震的运行参数和燃料成分评估

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Legacy integral compressor engines are crucial to the operation of the North American natural gas pipeline network. Many of these engines are uncontrolled utilizing mechanical scavenging or light turbocharging. The engines typically operate between similar to 10 and 20 g/bhp-hr of NOx with a minimal knock margin. While suitable for typical pipeline gases, high ethane shale gas can erode the knock margin with the added risk of performance degradation and engine damage. Phase one of the project investigated the impact of variable fuel quality and determined which engine parameters (ignition timing, air manifold temperature, and trapped equivalence ratio) were most effective in preventing and controlling knock. Phase two of the project evaluated the ability of an accelerometer and a NOx emissions sensor to detect engine knock as well as the development of knock prediction models.
机译：传统的整体式压缩机发动机对于北美天然气管道网络的运营至关重要。这些机械中有许多是利用机械扫气或轻型涡轮增压来控制的。发动机通常以最小的爆震幅度在类似于10至20 g / bhp-hr的NOx之间运行。高乙烷页岩气虽然适用于典型的管道气体，但会侵蚀爆震裕度，从而增加性能下降和发动机损坏的风险。该项目的第一阶段研究了可变燃料质量的影响，并确定了哪些发动机参数（点火正时，空气歧管温度和截留当量比）在预防和控制爆震方面最有效。该项目的第二阶段评估了加速度计和NOx排放传感器检测发动机爆震的能力以及爆震预测模型的开发。

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