Working Paper Article Version 1 This version is not peer-reviewed

Operation Parameters and Structure Optimization Based on Numerical Method on a Spray Dispersion Desulfurization Tower

Version 1 : Received: 27 January 2020 / Approved: 28 January 2020 / Online: 28 January 2020 (05:29:03 CET)

How to cite: liu, J.; Luo, F.; Zhou, S. Operation Parameters and Structure Optimization Based on Numerical Method on a Spray Dispersion Desulfurization Tower. Preprints 2020, 2020010333 liu, J.; Luo, F.; Zhou, S. Operation Parameters and Structure Optimization Based on Numerical Method on a Spray Dispersion Desulfurization Tower. Preprints 2020, 2020010333

Abstract

The desulfurization efficiency of a novel spray dispersion tower is determined by its operation conditions and structure design. Since there are spray section, bubble section inside the spray dispersion tower, and their multiphase flow patterns are difference, the twin sections were simulated separately. The multiphase flow and SO2 absorption performance in the two sections were obtained, based on the two-membrane theory, together with a series of suitable models and different tracking methods. Then, the prediction results were in good agreement with measured figures to validate the dependability of the simulation model. As for working condition, the desulfurization rate ratio of spray and bubble section in the original structure was 1.41, in which the spray section showed better SO2 absorption efficiency. The recommended tubes immersion depth and liquid-to-gas ratio were 0.14m~0.16m and 3.03L/Nm3~3.6L/Nm3 to attain higher energy and economical saving respectively. As for structure design, the flue gas streamline path was more homogeneous distributed in dual entrance spray section than single spray. While in bubble section, there is stronger back-mixing of slurry in optimized circular type than the original one. Also, the steeper descend of average temperature and average SO2 mass fraction along the vertical, together with lower SO2 mass fraction in circular type can be observed. Finally, the SO2 removal efficiency in twin entrance spray section was 3% higher than that of single entrance spray section. While in bubble section, the circular type was 8% higher than square type, with higher efficient to reach quasi-static state.The achieved results lay a solid basis to provide an insight into design, simulation, optimization and upscale of a spray dispersion tower.

Subject Areas

spray dispersion tower; flue gas desulfurization; numerical investigation; two-phase flow; structural optimization

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