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600MW超临界循环流化床锅炉控制系统研究

DOI: 10.13334/j.0258-8013.pcsee.2014.35.009, PP. 6319-6328

Keywords: 循环流化床,超临界,控制,即燃碳

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Abstract:

超临界600MW循环流化床(circulatingfluidizedbed,CFB)机组具有更复杂的锅炉特性,因此超临界循环流化床机组的控制系统对于锅炉的安全与稳定运行具有重要的意义,其中控制策略是控制系统的核心与难点。CFB炉膛内存储的即燃碳燃烧是CFB锅炉燃烧发热量的主导因素,是造成CFB锅炉燃烧比煤粉炉滞后的主要原因。文中通过机理分析构造CFB锅炉的即燃碳模型,估算了某台600MW超临界CFB锅炉炉膛内即燃碳量。将该状态量应用于锅炉的给煤控制、给水控制、送风控制系统中,提高了机组负荷的动态响应特性,稳定机组的主蒸汽压力、主蒸汽温度等参数。实践验证了所提控制策略和所构造模型的有效性。

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