中国电力 ›› 2016, Vol. 49 ›› Issue (10): 132-135.DOI: 10.11930/j.issn.1004-9649.2016.10.132.04

• 节能与环保 • 上一篇    下一篇

双塔双循环脱硫系统的运行现状分析与优化 措施探讨

魏宏鸽1,徐明华2,柴磊1,朱跃1   

  1. 1. 华电电力科学研究院,浙江 杭州 310030;
    2. 东台市市场监督管理局,江苏 东台 224200
  • 收稿日期:2016-03-12 出版日期:2016-10-10 发布日期:2016-11-07
  • 作者简介:魏宏鸽(1986—),男,江苏南京人,从事火电厂脱硫、脱硝与除尘技术研究。E-mail: seuweihongge@163.com

Current Operation State Analysis and Optimization Method Exploration on Double-Tower Double-Cycle Wet-FGD Systems

WEI Hongge1, XU Minghua2, CHAI Lei1, ZHU Yue1   

  1. 1. Huadian Electric Power Research Institute, Hangzhou 310030, China;
    2. Dongtai Market Supervision and Administration Bureau, Dongtai 224200, China
  • Received:2016-03-12 Online:2016-10-10 Published:2016-11-07

摘要: 为满足超低排放要求,需对脱硫系统进行优化和改造,其中双塔双循环技术为可选方案之一。通过现场试验和调研的方式,从脱硫效率、洗尘效率、系统阻力、运行方式等角度,分析了双塔双循环脱硫技术的运行特点。现场试验及实际调研结果表明,双塔双循环脱硫系统具有脱硫裕量较大、运行可靠性高等特点,脱硫效率往往能达到99%以上,同时其协同除尘效果要优于常规单塔单循环系统,是燃中、高硫煤机组超低排放改造技术路线之一。针对双塔双循环脱硫技术设计及运行中存在的主要问题,如循环泵备用数量较多,二级吸收塔氧化风机的利用率不高,一级塔液位下降较快和二级塔液位上升过快,以及系统设计阻力过大等,提出了优化及改进措施。

关键词: 燃煤电厂, 烟气脱硫, 双塔双循环系统, 协同除尘, 水平衡

Abstract: Optimization and retrofit is needed for the FGD systems in order to meet the requirements of ultra-low emission. As one of the solution candidates, the double-tower double-cycle wet-FGD system is analyzed through field tests and investigations, in the aspects of desulfurizing efficiency, dust removing efficiency, system resistance and operation mode. The results show that the double-tower double-cycle wet-FGD system has the characteristics of high reliability and larger operating margin. Its desulfurizing efficiency can reach above 99%. Meanwhile, its collaborative dust removing effect is superior to single tower wet-FGD systems, which makes it an ideal choice for ultra-low emission retrofits in units burning middle-sulfur and high-sulfur coal. In addition, regarding the main problems of double-tower double-cycle wet-FGD system in its design and operation process, such as redundant reserved pumps, low utilization rate of oxidation fans in the secondary absorber, fast dropping speed and fast rising speed of liquid level in primary absorber and secondary absorber, high designed system resistance and so on, the corresponding optimization and improvement measures are proposed.

Key words: coal-fired power unit, flue gas desulphurization, double-tower double-cycle wet-FGD system, collaborative dust removal, water balance

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