Mirant Deals with Upsets and Transients in Coal-fired Boilers

摘要

Operating a boiler is a careful balancing act, marching the fuel, airflow and draft pressure throughout a wide range of load conditions. As plants are being called on to operate differently than in years past, the range of load conditions has increased even more. Mirant Corp operates eight power plants in the eastern US and another three in the San Francisco Bay area. Over the last few years, the company has been replacing the ID fan actuators at its four coal-fired plants in Maryland and Virginia with Rexa electraulic actuators from Koso America. Mirant had been using a variety of actuators, some of which were original equipment and others installed as part of a retrofit. But none of the drives met the company's speed requirements. The Rexa electraulic actuators, however, would meet Mirant's speed and accuracy requirements. Mirant installed the first Rexa controller on its Morgantown plant. Based on the success at that location it became the company's standard.