Prediction and Experimental Validation Studies of Wet Flue Gas Desulphurization with a Novel Type PCF Device Based on Limestone-Gypsum

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• 作者：Hongliang Gao ; Caiting Li ; Guangming Zeng ; Wei Zhang ; Lin Shi ; Shanhong Li ; Yanan Zeng ; Xiaopeng Fan ; Qingbo Wen ; Xin Shu
• 刊名：Energy & Fuels
• 出版年：2010
• 出版时间：September 16, 2010
• 年：2010
• 卷：24
• 期：9
• 页码：4944-4951
• 全文大小：939K
• 年卷期：v.24,no.9(September 16, 2010)
• ISSN：1520-5029

文摘

A novel wet-type flue gas desulphurization process were developed and tested in this study. The process used a PCF device as the absorber where SO₂ was absorbed into slurry of reactive CaCO₃. A model of external mass-transfer based on the two-film theory was proposed for estimation of the SO₂ absorption in the PCF device, and the theoretical SO₂ removal efficiency was compared with the experimental data. The results show that the SO₂ absorption rate in the spray zone is controlled by a combination of gas- and liquid-film diffusions in the range of tested operating conditions. The increase of gas flow rate and droplet size and decrease of liquid−gas ratio all can lead to a decrease in the SO₂ removal efficiency. Addition of Cl⁻ to the slurry (25 g/L) decreases the SO₂ removal efficiency from 83.87 to 70.75%. when comparing the results of prediction and experiment, the data show good agreement. With droplet size equal to 2500 μm, when gas flow rate and liquid−gas ratio are changed, the relative errors of SO₂ removal efficiency between the predicted and experimental data are below 3.40 and 8.67%, respectively. It demonstrates that the model proposed in the present study is an effective model to evaluate and predict the desulphurization performance of the novel type PCF device. Moreover, the theoretical model can be extended to apply in other wet FGD technologies.