Optimization Analysis and Energy Saving Strategy for Startup Process of a 660 MW Supercritical Boiler

A computing program HDBS was developed by establishing and solving the models for furnace combustion and heat transfer process to simulate the cold startup behavior of a supercritical once-through boiler from ignition to minimum startup load, and subsequently the minimum safety flow was determined, while the energy saving and security strategy were proposed. Results show that the program could well simulate the cold startup process and is able to provide optimal starting curves for the boiler in the process from ignition to minimum startup load, which therefore may be used for actual engineering calculations. Adopting a 20%BMCR startup flow can meet the safety startup requirements of the boiler, when the startup time could be greatly shortened, compared with the current scheme of 37%BMCR startup flow, resulting in reduced fuel and water consumption in the startup period. This is meaningful to the energy saving, emission reduction and grid connection of the power plant.