Editorial Department of Power Generation Technology
Doi
Abstract
ObjectivesWith the proposal of the “carbon peaking and carbon neutrality” goal, the proportion of clean energy generation in China continues to increase. In order to promote the consumption of new energy generation, thermal power units frequently adopt the wide load peak shaving operation mode. Therefore, it is necessary to establish a SO2 emission concentration model for coal-fired circulating fluidized bed (CFB) boilers that can adapt to wide load operation conditions to achieve ultra-low SO2 emission of CFB units.MethodsThrough in-depth research on the dynamic characteristics of SO2 generation and removal, a dynamic lumped parameter model of SO2 emission concentration at the furnace outlet is established using mechanism analysis method combined with mass conservation equation. A comprehensive dynamic model for the entire desulfurization process from coal supply and air supply to SO2 emission at the outlet of the desulfurization tower is established by reasonably simplifying the input of the model. The simulation verification is carried out by using the steady-state and dynamic operating condition data segments from the actual measurement data of CFB boilers.ResultsThe established dynamic model can predict the dynamic trend of net flue gas emissions approximately 240 seconds in advance.ConclusionsThe model can reflect the dynamic characteristics of the desulfurization process in the furnace, and has certain applicability under wide load conditions
