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凝结水过冷度产生的原因分析..doc

发布:2017-01-08约2.22万字共23页下载文档
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凝结水过冷度产生的原因分析 摘要:本文从各个方面分析了凝结水过冷度产生的原因及其对机组运行经济性、安全性的影响,从凝汽器的设计、改造、检修以及运行维护几个方面,提出了减小凝结水过冷度的对策,从而提高机组运行的经济性和安全性。 Abstract: this paper analyzed from various aspects the causes of the condensate supercooling degree and its impact on unit operation efficiency, safety, from the design of the condenser, modification, overhaul and operation maintenance aspects, and puts forward the measures to reduce the condensate supercooling degree, so as to improve the economic benefit of unit operation and safety. 关键词:凝汽器;过冷度;经济性;安全性 Key words: the condenser; Supercooling degree; Economy; security      1、引言 1, the introduction      凝汽器是凝汽式汽轮机的主要辅助设备,是汽轮机组系统的重要组成部分,它工作性能的好坏直接影响着整个机组的热经济性和安全性。而凝汽器运行状态的优劣集中表现在以下三个方面:是否保持在最佳真空、凝结水的过冷度是否最小以及凝结水的品质是否合格。其中凝结水的过冷度越大,说明被冷却水带走损失的热量越多,而这部分热损失要靠锅炉多燃烧燃料来弥补,从而导致整个热力系统热经济性降低。而且过冷度越大,凝结水中的含氧量也越多,从而加速了相关管道、设备的腐蚀速度。因此需从各个方面对凝汽水过冷度加以重视并采取措施使其减到最小,以此来提高机组运行的经济性和安全性。 Condenser is a main auxiliary equipment of condensing steam turbine, steam turbine unit system is an important part of its work performance is good or bad directly affects the thermal efficiency of the entire unit, and security. And advantages and disadvantages of the condenser running status in the following three aspects: whether to maintain the best vacuum, minimum of condensate supercooling degree and water quality is qualified. Of condensate supercooling degree, the greater the instructions was taken away by cooling water the more heat loss, and this part of the heat loss will depend on the boiler burning more fuel to make up for, resulting in reduced the whole thermal system thermal efficiency. And the greater the degree of supercooling, is, the more oxygen in condensate, which accelerated the corrosion rate of related piping and equipment. Therefore need from all aspects on the soda supercooling degree of attention and take measures to minimize the make it, in order to improve the economic benefit of unit operation and safety.      2、凝结水过冷度的定义和表示方法 2, the definition of condensate supe
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