Abstract: unplanned outage is one of important benchmarking content, and boiler ‘four pipe’ leakage is the main reason caused unplanned outage in thermal power plant at long time, which influences safety and stable operation of generation equipments seriously. In the 670t/h boiler of Tianjin Junliangcheng Power Generation Corporation Limited, the heating surface was arranged unreasonably, heating surface leakage was occurred frequently. Aiming at this problem, a special anti-explosion team was established, the boiler heating surface was supervised and checked during the boiler production, erection and operation. By continuous groping and improvement, a set of effective anti-abrasion, anti-explosion experiences were summarized. The application of these experiences reduces the leakage greatly, and unplanned outage was no occurred in 2006 and 2007.

Key words: ‘four pipe’ leakage, anti-abrasion and anti-explosion, benchmarking, technical supervision, unplanned outage