Lay-Up and Return to Service Practices at Ontario Power Generation

摘要

Ontario Power Generation (formerly Ontario Hydro) is a provincially owned Canadian Utility that has provided better than 80% of the Province’s electricity for the past 100 years. OPG’s current mix of assets includes several peaking fossil fuel plants (primarily coal fired drum units). This paper reviews the current practices for short and medium term lay-up of these peaking units. It includes the key return to service parameters and practices used at OPG, and reviews the relative performance of the units following these practices. The paper focuses on the water chemistry aspects of the lay-up and return to service. In particular, chemical parameter monitoring and chemical dosing practices in addition to the use of chemical control equipment such as condensate polishers. The paper focuses on two-shifting, weekend outage turnarounds, and planned maintenance outage turnarounds, but it also covers indefinite length non-maintenance outages which can last up to several months