双塔双循环脱硫除雾器故障分析及对策研究

doi:10.11930/j.issn.1004-9649.201805056

摘要/Abstract

摘要： 除雾器是湿法烟气脱硫系统关键设备之一，其性能直接影响脱硫系统甚至机组的安全运行。以某660 MW燃煤机组双塔双循环脱硫系统除雾器堵塞并导致部分模块掀翻故障为例，对影响除雾器性能的空塔流速、安装空间、冲洗水压等设计因素，入口烟尘浓度，除雾器冲洗水量，浆液、石膏及结垢物成分等进行了全面分析。结果表明：脱硫系统水平衡控制不当以及二级塔pH值控制偏高是除雾器故障主要原因。为降低除雾器运行风险，针对双塔双循环脱硫系统水平衡和浆液pH值控制，给出了合理建议。

关键词: 燃煤电厂, 烟气脱硫, 双塔双循环, 除雾器, 水平衡

Abstract: As one of the most critical equipments in wet flue gas desulfurization system, the performance of the demister will directly affect the operation security of the desulfurization system and even compromise the generation unit itself. This paper took the failure scenario of the double tower double cycle desulfurization of a 660 MW coal-fired unit as an example, in which the blockage of demister caused overturn fault on some modules. The comprehensive analysis was also conducted regarding the demister design factors (such as the air velocity within the cooling tower, the mounting space, the pressure of flush water etc.), the concentration of entrance smoke, the rinse water volume of demister as well as the components of slurry, gypsum and fouling materials. It was found that the improper water balance control of desulfurization system and the high pH value settings of the secondary tower were the major culprits of demister failure. In order to reduce the risk of operation failure of the demister, some reasonable suggestions were given for the control of water balance and slurry pH value of the double tower double cycle desulfurization system.

Key words: coal-fired power plant, gas desulfurization, double tower double cycle, demister, water balance

中图分类号:

TM621
X701

李壮, 胡妲, 朱跃. 双塔双循环脱硫除雾器故障分析及对策研究[J]. 中国电力, 2019, 52(2): 172-177.

LI Zhuang, HU Da, ZHU Yue. Failure Analysis and Countermeasures of Double Tower Double Cycle Desulfurization Demister[J]. Electric Power, 2019, 52(2): 172-177.

导出引用管理器 EndNote|Ris|BibTeX

链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.201805056

https://www.electricpower.com.cn/CN/Y2019/V52/I2/172

参考文献

[1] 姚杰, 仲兆平, 周山明. 湿法烟气脱硫带钩波纹板除雾器结构优化数模拟[J]. 中国电机工程学报, 2010, 30(14):61-67 YAO Jie, ZHONG Zhaoping, ZHOU Shanming. Numerical simulation on wave-plate demister with hamulus in wet flue gas desulfurization[J]. Proceedings of the CSEE, 2010, 30(14):61-67
[2] 曾渊奇, 王凯, 周福生, 等. 石灰石-石膏法脱硫系统除雾器结垢原因分析及预防[J]. 能源工程, 2018(1):55-57 ZENG Yuanqi, WANG Kai, ZHOU Fusheng, et al. Cause analysis and prevention of the mist eliminator scale formation in limestone-gypsum wet desulfurization system[J]. Energy Engineering, 2018(1):55-57
[3] 杨宏慧, 陈晨, 林继香, 等. 脱硫除雾器频繁堵塞原因分析及对策[J]. 河南电力, 2013, 41(4):48-49, 54 YANG Honghui, CHEN Chen, LIN Jixiang, et al. Desulfurization except fog device frequently plug causes analysis and countermeasures[J]. Henan Electric Power, 2013, 41(4):48-49, 54
[4] 岳海, 白德龙. 脱硫除雾器存在的问题分析及治理[J]. 华北电力技术, 2013(8):69-70 YUE Hai, BAI Delong. Analysis on problems of mist eliminator of desulphurization system and its coutermeasure[J]. North China Electric Power, 2013(8):69-70
[5] 党龙, 张晓玲, 王智, 等. 湿法脱硫系统除雾器结垢分析及预防措施[J]. 发电与空调, 2017, 38(1):30-34 DANG Long, ZHANG Xiaoling, WANG Zhi, et al. Analysis and preventive measures for scaling in mist eliminator of WFGD system[J]. Power Generation&Air Condition, 2017, 38(1):30-34
[6] 杜振, 魏宏鸽, 张杨, 等. 高效脱硫协同除尘关键技术分析[J]. 中国电力, 2018, 51(6):37-41 DU Zhen, WEI Hongge, ZHANG Yang, et al. Analysis on key technologies of high efficiency desulfurization and collaborative dust removal[J]. Electric Power, 2018, 51(6):37-41
[7] 尤良洲, 王丰吉, 胡妲, 等. 高效除尘除雾器在超低排放中应用的技术经济分析[J]. 中国电力, 2018, 51(8):162-166 YOU Liangzhou, WANG Fengji, HU Da, et al. Technical and economic analysis on the application of high efficiency dust precipitator in ultra-low emission units[J]. Electric Power, 2018, 51(8):162-166
[8] 王丰吉, 尤良洲, 朱跃, 等. 冷凝式除雾器在脱硫系统中的应用及性能评价[J]. 中国电力, 2018, 51(4):143-148 WANG Fengji, YOU Liangzhou, ZHU Yue, et al. Application and performance evaluation of condensed mist eliminator in desulphurization system[J]. Electric Power, 2018, 51(4):143-148
[9] 邱桂芝, 张志刚, 宋寅, 等. 管束式除雾器结构优化数值模拟及高效除雾器研制[J]. 中国电力, 2018, 51(5):134-140 QIU Guizhi, ZHANG Zhigang, SONG Yin, et al. Numerical simulation on tube bundle demister and development of high efficiency demister r[J]. Electric Power, 2018, 51(5):134-140
[10] 何仰朋, 陶明, 石振晶, 等. 喷淋脱硫塔内除雾器运行特性[J]. 中国电力, 2015, 48(7):124-128 HE Yangpeng, TAO Ming, SHI Zhenjing, et al. Operating characteristics of mist eliminator in desulfurization spray tower[J]. Electric Power, 2015, 48(7):124-128
[11] 刘嘉宇, 刘亚明, 郝雅洁, 等. 湿法脱硫塔内脱硫浆液运动特性[J]. 中南大学学报(自然科学版), 2016, 47(1):330-337 LIU Jiayu, LIU Yaming, HAO Yajie, et al. Motion characteristics of gypsum slurry in wet-type desulphurization tower[J]. Journal of Central South University (Science and Technology), 2016, 47(1):330-337
[12] 吴春华, 秦绪华, 徐忠峰. 脱硫吸收塔除雾器堵塞防治对策[J]. 吉林电力, 2014, 42(1):49-51 WU Chunhua, QIN Xuhua, XU Zhongfeng. Prevention and treatment measures for desulfurization absorb tower mist eliminator blockage[J]. Jilin Electric Power, 2014, 42(1):49-51
[13] 周臣, 张子昕, 谭文轶. 湿法脱硫工艺中MnSO₄对CaSO₃氧化与溶解速率的控制研究[J]. 环境工程, 2017, 35(7):106-109 ZHOU Chen, ZHANG Zixin, TAN Wenyi. Study on oxidation rate of CaSO₃ with the catalyst of MnSO₄ in the process of WFGD[J]. Environmental Engineering, 2017, 35(7):106-109
[14] 张军梅. 提高电站湿法脱硫系统效率及可靠性的几点措施[J]. 中国电力, 2013, 46(5):13-17 ZHANG Junmei. Several measures of improving the efficiency and reliability of FGD system in power plant[J]. Electric Power, 2013, 46(5):13-17
[15] 龙天宇, 周安, 唐兴兴, 等. 除雾器堵塞原因分析及应对[J]. 化工技术与开发, 2016, 45(7):61-63 LONG Tianyu, ZHOU An, TANG Xingxing, et al. Reason analysis for defogger blocking and its treatment[J]. Technology &Development of Chemical Industry, 2016, 45(7):61-63
[16] 禾志强, 祁利明, 马青树. 石灰石-石膏法脱硫系统除雾器堵塞研究[J]. 锅炉技术, 2010, 41(1):77-80 HE Zhiqiang, QI Liming, MA Qingshu. The study of demister blocking in lmiestone-gypsum desulfurization technology[J]. Boiler Technology, 2010, 41(1):77-80