Study on Oil-Saving Technology in Startup and Shutdown of 1 000-MW Units

In this paper, the high fuel oil consumption during the startup and shutdown processes of 1 000-MW ultra-supercritical units with single bypass system is analyzed in details. Several measures to lower the oil consumption are proposed, such as reducing the output of single oil gun and the number of oil guns, minimizing the heat losses of steam and water in the startup drainage system, optimizing the operation mode of unit bypass system, shortening the warm-up time and the time from synchronization to the minimum oil-free stable-combustion loading, increasing the boiler water temperature in the process of cold recycling cleaning and adjusting the coal level of the coal bunker in advance when the unit is shut down. Additionally, it is recommended that by heating up the starting boiler with neighboring boiler and implementing tiny-oil ignition system the oil consumption can be reduced even further during unit startup.