天然气压缩机组用燃气发动机故障诊断技术分析

针对天然气压缩机组用燃气发动机检测信号干扰耦合给故障检测带来困难的问题, 采用一种基于曲轴转角动作事件与分频段故障信号检测相结合的诊断方法, 通过在曲轴飞轮上固定安装磁电式速度传感器, 建立基于曲轴转角的动作事件关系, 把故障诊断与基于曲轴转角的动作事件结合起来判断故障类型.以某站ZTY310MH压缩机组用燃气发动机性能检测为例, 测得缸内燃烧不充分并有弱点火及爆燃现象, 点火角度不合适及缸内积碳是造成发动机做功性能低劣的原因.结果表明:通过故障检测可及早发现和排除故障, 减少安全隐患和停机时间, 对提高发动机工作性能具有重要意义.

Analysis of Fault Diagnosis Technology on the Gas Engine of Natural Gas Compressor Units

For the fault detection difficulties of the natural gas compressors' engines caused by the coupled detection signals interference,a fault diagnosis method was adopted combining the units' action event and sub-band fault signals detection based on the crank angle. The fault type can be diagnosed accurately by analyzing the detection signals combining fault diagnosis and the units' action events,installing the fixed magnetic velocity sensor on the crankshaft,and establishing units action events based on the crank angle. ZTY310 MH performance tests of a booster station is taken as an example. Result of the detection verifies that the ignition angle improper and carbon deposit are the real reasons for engine working inferior. Detecting regularly for the engine of reciprocating compressor can be helpful to discover and diagnose faults as soon as possible and also reduce the security risks and downtime. Therefore,it is of great significance to improve the working performance of the engine of natural gas compressors.