Zhou Wenning, Ma Juan, Zeng Guoliang, Liu Baiqian
School of Energy and Environmental Engineering, University of Science and Technology Beijing Beijing 100083 China.
Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing Beijing 100083 China
RSC Adv. 2018 Nov 19;8(68):38903-38909. doi: 10.1039/c8ra07411a. eCollection 2018 Nov 16.
The aim of the present study is to investigate the process of dust deposition and its effects on the filtration performance of dynamic granular filters. We proposed a new theoretical explanation about the model for dust cake formation and growth, especially for the compression model at higher filtration superficial velocities in dynamic granular filters. The thickness and porosity of dust cakes can be estimated by formulas. Then, the effects of cake formation and growth on filtration performance were examined. It is found that there is an optimum thickness of the cake at which the dynamic granular filter achieves excellent collection efficiency with low system resistance. Moreover, an increasing pattern of pressure drop with cake thickness under different filtration superficial velocities was observed. Experimental results show that the pressure drops across the filter system and dust cake increase exponentially with increasing filtration superficial velocity. An appropriate filtration superficial velocity should be considered to achieve optimum filtration performance in dynamic granular filters. It is expected that the results of this study could provide useful information on designing dynamic granular filters for removal of dust particulates in Integrated Gasification Combined-Cycle (IGCC) and Pressurized Fluidized-Bed Combustion (PFBC).
本研究的目的是研究粉尘沉积过程及其对动态颗粒过滤器过滤性能的影响。我们针对粉尘饼形成和生长的模型，特别是动态颗粒过滤器中较高过滤表面速度下的压缩模型，提出了一种新的理论解释。粉尘饼的厚度和孔隙率可以通过公式估算。然后，研究了滤饼形成和生长对过滤性能的影响。研究发现，存在一个最佳的滤饼厚度，在该厚度下动态颗粒过滤器能够以低系统阻力实现优异的捕集效率。此外，还观察到在不同过滤表面速度下，压降随滤饼厚度的增加模式。实验结果表明，过滤系统和粉尘饼上的压降随着过滤表面速度的增加呈指数增加。在动态颗粒过滤器中，应考虑合适的过滤表面速度以实现最佳过滤性能。预计本研究结果可为设计用于去除整体煤气化联合循环（IGCC）和增压流化床燃烧（PFBC）中粉尘颗粒的动态颗粒过滤器提供有用信息。
