大型燃煤锅炉容克式空气预热器漏风相关问题

范文编号:RN046  范文字数:14725,页数:32

范文题目：大型燃煤锅炉容克式空气预热器漏风相关问题
摘    要
 容克式空气预热器是大中型电站锅炉上广泛采用的尾部换热设备，正常运行时漏风量大一直是影响锅炉效率的关键之一。漏风率高是该类空气预热器的致命缺点，所以在容克式空气预热器技术中，防止或降低漏风即密封技术占有很重要的地位。文中推导空气预热器漏风的一般性计算公式，分析影响漏风的因素，提出了采用双密封技术，新结构静密封，安装漏风自动控制系统等降低漏风的对策。本文分析了神华陕西国华锦界发电厂2093t／h锅炉回转式空气预热器漏风、磨损、堵灰、排烟温度高的原因。介绍了所采取的一系列有效改造技术。解决了漏风、磨损、堵灰及排烟温度高等难题。取得了良好的安全和经济效益。
 本文在查阅大量科技文献资料基础上对容克式空气预热器采用双密封技术，新结构静密封，安装漏风自动控制系统的原理做简单介绍，对采用动静间隙密封技术的优势、技术特点进行了分析；根据我国现状预测这一技术应用前景，并提出相应的对策。
 
 
 范文类型：设计报告

 
 关 键 词：空气预热器；压差；间隙；漏风；密封

Title: Large-scale coal-fired boilers Ljungstrom air preheater leakage-related issues
ABSTRACT
 Ljungstrom air preheater and medium-sized power plant is widely used on the rear of the boiler heat transfer equipment, a large quantity of air leakage during normal operation affecting the boiler efficiency has been one of the keys. The high leakage rate of such fatal shortcoming of air preheater, so Ljungstrom air preheater technology, to prevent or reduce the air leakage sealing technology that plays an important role. Paper derived a general air preheater leakage formula to analyze the factors that affect the air leakage is proposed dual-seal technology, the new structure, static seal, install the automatic control systems to reduce leakage of air leakage response. This paper analyzes the divine power plants in China, Shaanxi Country Huajin sector 2093t / h boiler rotary air pre-heater leakage, wear, plugging ash, smoke high temperature causes. A description of the transformation adopted a series of effective techniques. Solve the air leakage, wear, ash, and exhaust gas temperature higher blocking problem. Has achieved good safety and economic benefits.      In this paper, the basis of information access to a large number of scientific and technical literature on the Ljungstrom air preheater dual-seal technology, the new structure, static seal, the installation of air leakage of the principle of automatic control system to do a brief introduction on the use of the advantages of dynamic and static sealing technology gap, technical characteristics of the analysis; according to China's status quo prediction application prospect of this technology and propose countermeasures.

Paper Type: Design Report

KEY WORDS: Air preheater; pressure; clearance; leakage; seal
目  录
 1 绪论 1
 2 空气预热器的工作原理及作用 2
 3 空气预热器的类型及优缺点 3
 3.1 板式空气预热器 3
 3.2 回转式（容克式）空气预热器 3
 3.3管式空气预热器 4
 4 空气预热器的漏风机理、规律及控制措施
 4.1漏风的机理及其规律 5
 4.2漏风因素的分析及对策 6
 4.2.1降低泄漏系数K的措施——双重密封或多重密封 6
 4.2.2空气侧与烟气侧的压力差△P的控制 8
 4.2.3降低间隙面积F的措施 10
 4.2.3.1选择合理的转子直径间隙面积的计算公式 10
 4.2.3.2热端径向间隙的控制 10
 4.2.3.3冷端径向间隙的控制 11
 4.2.3.4轴向密封间隙的控制 12
 4.2.3.5静密封间隙的控制 12
 5神华陕西国华锦界电厂空预器技术特点 13
 5.1更加强调漏风指标控制 13
 5.2预热器的结构改进 13
 6 神华陕西国华锦界电厂空预器性能试验结论 17
 7空预器漏风治理 23
 7.1漏风治理措施 23
 7.2漏风治理经济性分析 23
 7.3结束语 24
 8结论与展望 25
    致    谢 26
    参考文献 27
    附    录 28

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