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Abstract.A numerical software analysis of the turbulent and strongly swirling flow field of a cyclone separator with downward exhaust gas and its performances is described. The ANSYS 14.0 simulations based on DPM model are also used in the investigation. A new set of geometrical design has been optimized to achieve minimum pressure drop and maximum separation efficiency. A comparison of numerical simulation of the new design confirm the superior performance of the new design compared to the conventional design.The influence of the structure parameters such as the length of the guide pipe, the shape of the guide, the inlet shape on the separation performance was analyzed in this research. This research result has certain reference value for cyclone separator design and performance optimization.

The effects of leaching parameters on the composition of the adsorbent derived from steel slag is studied in this study, and the CO 2 capture characteristics and cyclic stability of the derived adsorbent under the effect of the element composition are also investigated. The results show that well-developed pore structure of derived adsorbents are obtained compared with the raw steel slag. The calcium content in the adsorbent significantly increases after leaching, improving the CO 2 capture ability of the derived adsorbents. The Fe, Si, and Al contents decrease, while the Mg and Mn contents change little after leaching, which increases the cyclic stability of the derived adsorbent compared to that of analytically pure CaO. Under the optimized working conditions, the initial CO 2 capture ability of the derived adsorbent is 0.61 g CO2 /g-sorbent. The deactivation ratio of the sample after 20 cycles is 52.46%, showing good performance compared to that of analytically pure CaO.