Dynamic characteristics of thermal components in lignite-fired supercritical boiler

With rapid rise of solar and wind power capacity, power network is urgent in need of peak regulation capacityof thermal plant.And thermal plant presents characteristic of large amplitude and high-frequency load fluctuation. Simulation models of a 600 MW supercritical lignite-fired once-through boiler weredevelopedwith GSE software.The dynamic operation process of thermal componentsin the boiler system, such as water wall, economizer, superheater, reheater, pulverizing system, air preheater, and pump and fan are simulated. It is found that the dynamic characteristics of thermal componentsaredifferent due to the differences in install positions and functions. For example, the response time of economizer, pulverizing system and air preheater for the disturbance are longer than that of other thermal components. It can last more than 700 seconds. For, water wall, superheater, or reheater, the response time is about 400 seconds. For the pump and fan, the timeof dynamic process can be neglected when compared with other components.