Abstract:

To improve operational reliability of 600MW and above coalfired units ，it analyzed the factors affecting the reliability of 600MW and above coalfired units of 2016. It is concluded that the poor quality of maintenance, poor quality of products and fuel affection are the main reasons for the unplanned outage of the units， among which the poor quality of maintenance is the dominant reason. Unplanned outages caused by boilers accounted for the largest proportion of unplanned outages caused by the three main equipment. Blockage, steam leakage, oil leakage, water leakage, great vibration, jam, abrasion, high temperature, corrosion, cracks and so on, are the main factors affecting the reliability of auxiliary equipment.