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浙江大学学报(工学版)
浙江大学学报(工学版)  2023, Vol. 57 Issue (4): 675-682    DOI: 10.3785/j.issn.1008-973X.2023.04.004
机械与能源工程     
1 000 MW燃煤机组湿法脱硫装置氧化系统运行优化
范海东1,2(),陈竹1,赵中阳1,梁成思4,郑成航1,3,*(),高翔1,3
1. 浙江大学 国家环境保护燃煤大气污染控制工程技术中心，浙江 杭州 310027
2. 白马湖实验室，浙江 杭州 310056
3. 浙江大学 嘉兴研究院，浙江 嘉兴 314031
4. 浙江浙能技术研究院有限公司，浙江 杭州 311121
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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摘要：

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    
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.
Key words: wet limestone-gypsum flue gas desulfurization    natural oxidation rate    forced oxidation rate    oxidation system operation optimization    energy saving and consumption reduction
收稿日期: 2022-04-06 出版日期: 2023-04-21
CLC:  X 511  
基金资助: 国家重点研发计划资助项目（2020YFB0606203-4）
通讯作者: 郑成航     E-mail: fan_haidong@163.com;zhengch2003@zju.edu.cn
作者简介: 范海东（1979—），男，高级工程师，硕士，从事能源与环保技术的研究. orcid.org/0009-0007-8683-045X.E-mail： fan_haidong@163.com
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范海东
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引用本文:

范海东,陈竹,赵中阳,梁成思,郑成航,高翔. 1 000 MW燃煤机组湿法脱硫装置氧化系统运行优化[J]. 浙江大学学报(工学版), 2023, 57(4): 675-682.

Hai-dong FAN,Zhu CHEN,Zhong-yang ZHAO,Cheng-si LIANG,Cheng-hang ZHENG,Xiang GAO. Operating optimization of oxidation subsystem of wet flue gas desulfurization system of 1 000 MW coal-fired unit. Journal of ZheJiang University (Engineering Science), 2023, 57(4): 675-682.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2023.04.004    或    https://www.zjujournals.com/eng/CN/Y2023/V57/I4/675

图 1  脱硫装置的自然氧化过程与强制氧化过程
图 2  现场实测与模型预测的四价硫浓度对比
图 3  关键参数在不同原烟气体积流量下对自然氧化率的影响
图 4  关键参数在不同气泡直径下对强制氧化率的影响
图 5  脱硫装置氧化系统优化运行方法
图 6  机组负荷与自然氧化率
图 7  机组负荷与氧化风需求量
运行策略 运行风机 fl,a/Hz fh,a/Hz Pa/kW rw/%
按额定频率 1号 76.0 76.0 225.0 —
按额定频率 2号 85.0 85.0 225.0 —
按运行经验 1号 64.8 75.3 216.3 4.3
按运行经验 2号 75.0 84.5 215.9 4.0
按优化方法 1号 23.7 70.0 167.4 25.6
按优化方法 2号 37.4 79.5 176.0 21.8
表 1  氧化系统不同运行策略的能耗对比分析
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