MAK 12V32原油主机单缸异常高温故障排查浅析

Abnormal High Temperature Troubleshooting Analysis of One Cylinder in Crude Oil Engine MAK 12V32

南海某平台MAK 12V32原油主机调试阶段燃烧含硫燃料发生排气高温故障。使用电子爆压表监测比对各气缸压力曲线对造成排气高温故障的原因进行分析发现Cyl7缸内压力存在升压缓慢、发火时间晚等异常现象。分析排查发现Cyl7排气门存在烧蚀现象,这也解释了压力曲线异常的原因。基于上述分析结果,对如何避免因使用高含硫燃料造成排气门烧蚀现象的发生给出了建议。

Abnormal high temperature trouble happened in one cylinder of the diesel engine MAK 12V32 on a certain subsea platform in the South China Sea during the commissioning phase. Through the troubleshooting analysis of the data of crude oil engine operation, it is found that the Cyl7 exhaust temperature is too high. Then analysis of the rea- sons for the high temperature trouble of the exhaust gas by the comparison of pressure curve of each cylinder by using the electronic explosion pressure gauge has found that the pressure in the cylinder Cyl7 rises too slowly and the igni- tion is delayed. Further inspection shows that ablation phenomenon does exist in the exhaust valve itself, which can explain why the pressure curve is abnormal. Based on the above analysis, suggestions are given to avoid the ablation of exhaust valve caused by using high sulfur fuel.