Removal of fine particles in wet flue gas desulphurization system by heterogeneous condensation

被引：0

作者：

Bao, Jingjing ^{[1
]}

Yang, Linjun ^{[1
]}

Yan, Jinpei ^{[1
]}

Liu, Jinhui ^{[1
]}

Song, Shijuan ^{[1
]}

机构：

[1] School of Energy and Environment, Southeast University

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2009年 / 39卷 / 05期

关键词：

Fine particles; Heterogeneous condensation; Removal; Wet flue gas desulphurization;

D O I：

10.3969/j.issn.1001-0505.2009.05.027

中图分类号：

学科分类号：

摘要：

A novel process to remove fine particles with high efficiency by heterogeneous condensation in a wet flue gas desulphurization (WFGD) system is presented. A supersaturated vapor phase, necessary for condensational growth of fine particles, was achieved in the SO2 absorption zone and at the top of the wet FGD scrubber by adding steam in the gas inlet and above the scrubbing liquid inlet of the scrubber, respectively. The condensational grown droplets were then removed by the scrubbing liquid and a high-efficiency demister. The results show that the effectiveness of the WFGD system for removal of fine particles is related to the SO2 absorbent employed. When using CaCO2 and NH3·H2O to remove SO2 from flue gas, the fine particle removal efficiencies are lower than those using Na2CO3 and water as result of the formation of aerosol particles in the limestone and ammonia-based FGD processes. The performance of the WFGD system for removal of fine particles is significantly improved for both steam addition cases, for which the removal efficiency increases with the increasing amount of added steam. Removal efficiency of fine particles can reach to more than 60%~70% while the amount of added steam being 0.05 kg/m3. A high liquid to gas ratio is beneficial for efficient removal of fine particles by heterogeneous condensation of water vapor. Removal efficiency of fine particles increases with increasing gas-liquid temperature difference at WFGD inlet. High removal efficiency can also be obtained by atomized droplets evaporation in hot flue gas besides steam addition.

引用

页码：1002 / 1007

页数：5

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