New Paradigm For Plant Cycle Chemistry Requirements

摘要

The economics of deregulation have changed the operating scenarios for new plants. In the past, the newest, most efficient plants were base-loaded. Older plants followed load. Still older plants cycled on and off, and a few gas turbines were used to support peak load. We now see combined cycle plants with approximately 58% thermal efficiency cycled on a daily basis from the first day of commercial operation. Indeed, plants are now being designed for fast start to support this operating scheme. Existing operating chemistry requirements are founded on the premise that most of the plant time is spent on-line. Cycling plants need a new way of thinking about startup.