Abstract
Large-scale pilot studies of oxy-fuel combustion have demonstrated that it is a promising CO2 capture technology. In this study, steady-state and dynamic models of oxy-fuel combustion were developed using the Yingcheng 35 MWth oxy-fuel combustion pilot facility as a prototype. Using specific features of Aspen software, a customized drum and furnace radiation model was developed to make it easier to represent the real features of the 35 MWth facility. The mode switching process between air combustion and oxy-fuel combustion is focused on in particular, using both a ‘step by step’ and a ‘simultaneous’ switching scheme. It is found that maintaining the gas flow in the oxygen and recirculation flue at different slopes for different switching stages can be an effective switching strategy. ‘Simultaneous’ switching produces a better and smoother dynamic response during the switching process and is more exergy efficient. Together, these results can help to improve the operation of facilities and control system de...
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