Oxy-fuel combustion is a promising carbon capture technology in which both the conversion of fuel-N to NO and the reduction of recycled NO contribute to lowering of final NO exhausted from the coal combustion system. Combustion characteristics for both air and oxy-fuel conditions were numerically investigated in a pilot scale test facility for an Australian sub-bituminous coal. On the basis of De Soete's mechanism, the additional reactions for formation of fuel-NO and reduction of recycled NO were added into computational fluid dynamics (CFD) codes, using user-defined functions (UDFs). The NO x predictions in air and oxy-fuel combustion were compared to experimental data. The NO emission in oxy-fuel condition is predicted to be significantly lower than that in air combustion, even without recycled NO. The effect of the nitrogen partitioning ratio between volatile and char on the NO x emission was also investigated.

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On the basis of summarizing the characteristics of rain-wind-induced vibration of stayed cables, the wind-induced vibration force of in-plane and outer-plane is studied, and the motion equation of cables when free vibrated and when wind-induced vibration and damper interacted. With the Galerkin multimodal truncation method, the two expressions of the motion equations of the continuous system are studied, and their correlations are discussed. On the basis of discretization, the possibility of numerical calculation is considered. The solution strategy of the continuous system is presented when dampers are added.