瓦斯发动机气源波动适应性分析及改进
徐凯峰,郭进举,李治朋,夏立敏,陈毅
中国石油集团济柴动力有限公司,山东 济南 250306
摘要:为解决低浓度瓦斯气源波动造成的发动机功率波动、分闸、放炮、停机等故障,进一步提高瓦斯发动机气源波动适应性,以某12缸低浓度瓦斯发动机配套机组为研究对象,分析瓦斯气源波动对发动机性能的影响;增加故障降载功能对发动机控制系统进行优化,并进行试验验证。结果表明:瓦斯中甲烷的体积分数变化率低于0.1%/min时,发动机功率波动不大,控制系统能够通过闭环控制使发动机恢复到稳定状态;瓦斯中甲烷的体积分数变化率大于1%/s时,发动机运行在额定功率的90%、50%工况时,功率波动较大,试验过程中伴有放炮现象;在瓦斯发动机控制系统中增加故障降载功能及进行参数标定后,当气源剧烈波动时,控制系统及时降低发动机功率、快速修正瓦斯流量,使发动机安全平稳度过瓦斯波动期,增强发动机瓦斯气源波动适应性。
关键词:瓦斯发动机;控制系统;标定;适应性;故障降载
Adaptability analysis of gas source fluctuation in a gas engine and its improvement
XU Kaifeng, GUO Jinju, LI Zhipeng, XIA Limin, CHEN Yi
CNPC Jichai Power Company Limited, Jinan 250306, China
Abstract:In order to enhance the adaptability of gas source fluctuations in a gas engine, reduce engine load fluctuation, tripping, blasting, shutdown and other faults caused by fluctuation in low concentration gas sources, a 12 cylinder low concentration gas engine matching unit is selected as the research object. The impact of gas source fluctuation on engine operation is analyzed and studied, and the control system function is optimized by adding fault load reduction function and experimental verification is carried out. The results show that when the change rate of methane volume fraction in gas is less than 0.1%/min, the engine power fluctuation is not significant and the control system can restore the engine to a stable state through closed-loop control; when the change rate of methane volume fraction in gas is greater than 1%/s, the engine operates at 90% and 50% of the rated power, resulting in significant power fluctuations and accompanied by blasting during the test process. After adding fault load reduction function and parameter calibration in the gas engine control system, when the gas source fluctuates violently, the control system promptly reduces the engine power and quickly corrects the gas flow rate, which enable the engine to safely and smoothly pass through the gas fluctuation period and enhance the adaptability of the engine to gas source fluctuation.
Keywords: gas engine; control system; calibration; adaptability; fault load reduction