A novel multiphase computational fluid dynamics model based on the coupled Lagrangian−Eulerian approach was developed to assess the performance of the S809 airfoil of a horizontal-axis wind turbine under rainy conditions. The model was utilized for simulations of water film formation over the airfoil. Our simulation showed significant performance loss due to an increase in drag and lift degradation.
Regenerable MgO-based sorbent, which was prepared and evaluated in the thermogravimetric analyzer (TGA) in part 1, was also evaluated in high-pressure packed-bed unit in CO 2 /N 2 /H 2 O mixture and simulated pre-combustion syngas environment. In CO 2 /N 2 /H 2 O environment, The CO 2 absorption capacity of the sorbent increases with increasing temperatures from 6.7% at 350°C to 9.5% 450°C. The sorbent is capable of achieving over 95% CO 2 capture and 40% conversion in the WGS reaction, which should be attributed to positive effect of WGS reaction in producing CO 2 during the process. The sorbent reactivity and absorption capacity toward CO 2 , as well as its WGS catalytic activity decreases with increasing temperature. The maximum prebreakthrough WGS conversion occurs at 350°C, which diminishes as the sorbent is carbonated. The variable diffusivity shrinking core reaction model coupled with the two-fluid CFD model was shown to accurately predict the breakthrough gas compositions at different operating conditions.
We report the preparation of calcium oxide (CaO)-based sorbents by ultrasonic spray pyrolysis (USP) with both experimental results and modeling of the sorption process. To mitigate CaO deactivation during carbonation/regeneration cycles, metal oxides with high melting temperatures were dispersed into CaO particles in this bottom-up synthetic method (USP), and their performance was experimentally characterized and evaluated over 50 cycles. The performance of synthesized sorbents was then compared to those expected from an unreacted shrinking core model. The model was able to predict the experimental results and provide an explanation for the effect of sintering and agglomeration on the performance of the sorbents through a variable effective diffusivity. Moreover, it was used to extrapolate sorbent performance over large numbers of cycles.
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