Scaling Analysis and Preventive Measures of Limestone-Gypsum Wet Flue Gas Desulfurization

doi:10.12096/j.2096-4528.pgt.18069

Abstract

Abstract:

Scaling is one of the main problems affecting the safe and stable operation of limestone gypsum wet flue gas desulfurization (WFGD) system. In a power plant, the scaling of the primary tower and the mist eliminator of 330MW unit was serious, which had affected the normal operation of the flue gas desulfurization system. For this problem, the paper systematically analyzed the absorber and the operation parameters of the desulfurization system. It was found that the fault of the pulse suspension system, the blockage of the mist eliminator nozzle and the fluctuation of the slurry parameters were the main causes of the scaling in the absorber. By strengthening the flushing of the mist eliminator, monitoring and comparing the parameters of the mist eliminator and the slurry pulse pump at the beginning and normal operation, reasonably controlling the slurry density, pH value, oxidation air volume and fluoride ion concentration, the scaling of the primary tower had been effectively alleviated.

Key words: desulfurization, absorber, scaling, preventive measure

Wending LI,Huihua GAO,Wenfeng CAI. Scaling Analysis and Preventive Measures of Limestone-Gypsum Wet Flue Gas Desulfurization[J]. Power Generation Technology, 2019, 40(1): 51-55.

References

1	刘绍银. 湿法脱硫系统结垢的化学机理及运行控制分析[J]. 热力发电, 2011, 40 (1): 70- 72.
2	杜谦, 吴少华, 朱群益, 等. 石灰石/石灰湿法烟气脱硫系统的结垢问题[J]. 电站系统工程, 2004, 20 (5): 41- 44.
3	杨杨, 樊保国. 石灰石湿法脱硫吸收塔内结垢研究[J]. 锅炉技术, 2013, 44 (5): 71- 74.
4	董丽彦, 杨贝, 马帅, 等. 湿法脱硫除雾器减缓结垢的方法研究[J]. 现代化工, 2017, 37 (1): 168- 170.
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, 33 (1): 30- 34.
6	郭静东, 廖冬梅, 颜海伟. 燃煤电厂脱硫石膏品质影响因素及改进措施[J]. 发电与空调, 2017, 38 (6): 10- 13.
7	王辉新, 毛树花. 烟气脱硫系统吸收塔塔壁结晶问题分析及控制[J]. 河北电力技术, 2007, 26 (5): 51- 52.
8	天津大学无机化学教研室. 无机化学[M]. 北京: 高等教育出版社, 2002: 506- 507.
9	Dean J A . Lange's handbook of chemistry[M]. New York: McGraw Hill, 2005: 1331- 1342.
10	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.
11	陈益飞. FGD系统除雾器结垢冲洗及影响因素分析[J]. 江苏电机工程, 2010, 29 (4): 77- 79.
12	马磊, 沈汉年, 赵立冬. 石灰石/石灰湿法烟气脱硫结垢的机理及控制[J]. 工业安全与环保, 2007, 33 (9): 19- 20.
13	肖辰畅, 罗岳平, 李彩亭. 己二酸在湿法石灰石烟气脱硫系统中阻垢性能的研究[J]. 环境科学与管理, 2012, 37 (11): 127- 185.
14	郭瑞堂, 高翔, 王军, 等. 湿法烟气脱硫石灰石的活性[J]. 燃烧科学与技术, 2007, 13 (6): 485- 490.
15	钟秦. 石灰石湿法烟气脱硫中氟铝络合物的影响[J]. 南京理工大学学报, 2001, 25 (1): 75- 78.

[1]	Taozhu YIN, Yongsheng ZHANG, Tao WANG, Jiawei WANG. Preparation of Sulfur-doped Porous Carbon and Its Electro-adsorption Performance for Heavy Metals in Desulfurization Wastewater [J]. Power Generation Technology, 2023, 44(3): 382-391.
[2]	Wenbin LIU, Lulu LI, Xiaojin LI, Xuan YAO, Hairui YANG. Study on Parameter Optimization of Desulfurized Wet Flue Gas in Spray Condensation Process [J]. Power Generation Technology, 2023, 44(1): 107-114.
[3]	Cunwen LI, Zaihua WANG, Tao CHEN, Qianwei FENG, Ketao XU, Yang ZHANG. Research on Performance Prediction of Flue Gas Desulfurization System Based on Operation Data of Coal-fired Power Station [J]. Power Generation Technology, 2022, 43(4): 673-678.
[4]	Guohua QIU,Hongge WEI,Xiujin LIANG,Zhuang LI,Fengji WANG,Yue ZHU. Energy Consumption Analysis of Desulphurization Ultra-low Emission Operation and Outlook on Its Energy-saving Operation in Thermal Power Plants [J]. Power Generation Technology, 2020, 41(5): 510-516.
[5]	Weibo HAN,Shuang BIAN,Tao WANG,Jiawei WANG,Yongsheng ZHANG,Weiping PAN. Research Progress on Control of Heavy Metals Pollutants in Desulfurization Wastewater and Sludge of Coal-fired Power Plants [J]. Power Generation Technology, 2020, 41(5): 497-509.
[6]	Jianzhong LIU, Cong CHEN, Zhihao SUN, Jingfeng WU, Xiaojun WANG. Desulfurization Wastewater-assisted Coal Electrolysis for Hydrogen Production in Coal-fired Power Plants [J]. Power Generation Technology, 2020, 41(5): 536-542.
[7]	Yue ZHU,Yonglong YANG. Influence Analysis on Haze Control of Ultra-low Emission Wet Flue Gas Desulfurization of Coal-fired Power Plants [J]. Power Generation Technology, 2020, 41(3): 295-300.
[8]	Chunsong YE,Rong CAO,Wei LIANG,Wenyu ZHU,Wei ZHENG. Decomposition of Chloride and Ammoniate in the Evaporation Process of Desulfurization Wastewater With High Temperature Flue Gas [J]. Power Generation Technology, 2019, 40(4): 362-366.
[9]	Jiang FAN,Chenxi HUANG,Weixiong CHEN,Jiping LIU,Junjie YAN. Theoretical Analysis of Flue Gas Exhaust Temperature of White Smoke Elimination Technology for Coal-fired Units [J]. Power Generation Technology, 2019, 40(3): 239-245.
[10]	Haiwei YAN,Yazhao WANG,Jingdong GUO,Ke WANG,Dongmei LIAO. Cause Analysis and Control Countermeasures of Slurry Overflow in Desulfurization Absorber Tower Wastewater Pit [J]. Power Generation Technology, 2019, 40(2): 141-147.
[11]	Zhongwei WANG,Junjian SUN,Lichun ZHAO,Dawei ZHENG,Xiang LI,Wanjun QIAO,Hongbo MIAO,Zhenghua WU. Study on the Anticorrosive Methods for Reinforced Concrete Structure Chimney of Power Plant Caused by Wet Desulfurization [J]. Power Generation Technology, 2018, 39(6): 546-553.
[12]	Shuqin FENG,Xiaoze DU,Lijun YANG,Xinming XI. Evaporation Characteristics of Atomized Droplets Sprayed in Flue Gas Flow [J]. Power Generation Technology, 2018, 39(4): 343-353.
[13]	Ling QIN,Honglei DING,Weiguo PAN,Lazhen WANG,Chenggang DING,Shiyi GUO. Numerical Simulation of Entrainment by Jet Flow Characteristics in Spray Semi-dry Desulfurization Tower [J]. Power Generation Technology, 2018, 39(4): 336-342.
[14]	YE Wei-ping, QIU Guo-ming, DU Zhen, WEI Hong-ge, ZHANG Yang, ZHU Yue. Analysis for the Technology Roadmap of Flue Gas Ultra Low Emission in CFB [J]. Power Generation Technology, 2017, 38(2): 34-37,41.
[15]	DANG Long, ZHANG Xiao-ling, WANG Zhi, CHEN Jun, SHI Chen-xin. Analysis and Preventive Measures for Scaling in Mist Eliminator of WFGD System [J]. Power Generation Technology, 2017, 38(1): 30-34.