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| Operating optimization of oxidation subsystem of wet flue gas desulfurization system of 1 000 MW coal-fired unit |
Hai-dong FAN1,2( ),Zhu CHEN1,Zhong-yang ZHAO1,Cheng-si LIANG4,Cheng-hang ZHENG1,3,*(),Xiang GAO1,3 |
1. State Environmental Protection Center for Coal-Fired Air Pollution Control, Zhejiang University, Hangzhou 310027, China
2. Baima Lake Laboratory, Hangzhou 310056, China
3. Jiaxing Research Institute, Zhejiang University, Jiaxing 314031, China
4. Zhejiang Zheneng Technology Research Institute Limited Company, Hangzhou 311121, China |
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Abstract A model of the oxidation process in the wet flue gas desulfurization (WFGD) based on the mechanism of forced oxidation and natural oxidation process was established aiming at the problems of excessive oxidation air and high energy consumption of oxidation system under variable load and SO2 mass concentration operation existing in the application of limestone-gypsum WFGD technology. The influence of key parameters such as the O2 volume fraction in the flue gas, the diameter of bubbles or droplets and reaction enhancement factor on forced oxidation rate and natural oxidation rate was analyzed. A real-time operation optimization method of oxidation system based on the above-mentioned oxidation process model was proposed, and an industrial test was conducted on a 1 000 MW desulfurization unit. Results showed that the root-mean-square error (RMSE) of the variation of sulfur was less than 0.15 mol/m3. The natural oxidation rate fluctuated between 10% and 35% and the demand for oxidizing air fluctuated between 107 m3/min and 360 m3/min with the unit load fluctuating between 520 MW and 1 000 MW. The real-time operating optimization method of the oxidation subsystem can reduce the energy consumption by 23.7% compared with operating at rated power under the premise of enough oxidation rate of the WFGD system.
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Received: 06 April 2022
Published: 21 April 2023
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| Fund: 国家重点研发计划资助项目（2020YFB0606203-4） |
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Corresponding Authors:
Cheng-hang ZHENG
E-mail: fan_haidong@163.com;zhengch2003@zju.edu.cn
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1 000 MW燃煤机组湿法脱硫装置氧化系统运行优化
针对石灰石-石膏湿法烟气脱硫技术应用过程中存在的变负荷变SO2质量浓度条件下氧化风过量、氧化系统运行能耗高的问题，建立基于强制氧化和自然氧化过程机理的脱硫装置氧化过程模型，分析烟气中O2体积分数、气泡直径、液滴粒径、反应增强因子等关键参数对强制氧化率和自然氧化率的影响规律. 提出基于脱硫装置氧化过程模型的氧化系统实时运行优化方法，在1 000 MW机组脱硫装置上开展工业验证研究. 结果表明，模型计算的四价硫变化量均方根误差不超过0.15 mol/m3. 随着机组负荷在520 MW到1 000 MW之间变化，自然氧化率为10%~35%，氧化风需求量为107~360 m3/min. 相比于按额定功率运行，氧化系统实时运行优化方法能够在保证脱硫装置氧化率的前提下降低23.7%的能耗.
关键词：
石灰石-石膏湿法烟气脱硫,
自然氧化率,
强制氧化率,
氧化系统运行优化,
节能降耗
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