24-10-2012, 11:30 AM
Boiler Materials for Ultrasupercritical Coal Power Plants. Second Quarterly Report January 1-March 31, 2004
ABSTRACT
The U.S. Department of Energy (DOE) and the Ohio Coal Development Office (OCDO) have recently initiated a project
aimed at identifying, evaluating, and qualifying the materials needed for the construction of the critical components of
coal-fired boilers capable of operating at much higher efficiencies than current generation of supercritical plants. This
increased efficiency is expected to be achieved principally through the use of ultrasupercritical steam conditions (USC). The
project goal initially was to assess/develop materials technology that will enable achieving turbine throttle steam conditions
of 760 C (1400 F)/35 MPa (5000 psi), although this goal for the main steam temperature had to be revised down to 732 C
(1350 F), based on a preliminary assessment of material capabilities. The project is intended to build further upon the alloy
development and evaluation programs that have been carried out in Europe and Japan. Those programs have identified ferritic
steels capable of meeting the strength requirements of USC plants up to approximately 620 C (1150 F) and nickel-based alloys
suitable up to 700 C (1300 F). In this project, the maximum temperature capabilities of these and other available
high-temperature alloys are being assessed to provide a basis for materials selection and application under a range of
conditions prevailing in the boiler. This report provides a quarterly status report for the period of October 1 to December 30,
2003.