循环流化床锅炉的防磨措施初探

文档编号:RN039  文档字数:12961,页数:37

文档题目：循环流化床锅炉的磨损及防磨措施初探
 
摘　要
 循环流化床(CFB)锅炉是近几年在我国发展起来的一种新型燃烧设备，而循环流化床燃烧技术的发展以其高效率低污染的高性能更是突飞猛进。在环保要求日趋严格的今天，CFB锅炉已成为当前最有前途的燃烧设备，但是CFB与其它锅炉相比，磨损比较严。
 循环流化床锅炉受热面磨损是对循环流化床锅炉正常运行三大威胁(磨损、给煤不畅、排渣困难)之一，由于磨损（受热面、耐火材料、风帽等）造成的停炉事故接近停炉总数的50%。在很长时间内成为影响循环流化床锅炉推广应用的主要障碍。
 磨损在工程上常被理解为由于机械原因产生的颗粒剥离脱落引起的材料表面所不希望的逐渐变化，如减薄，开裂。锅炉常见的磨损即高速的灰粒子从不同的角度冲刷碰撞炉墙或受热面而引起的种种变化。有资料介绍，磨损量与烟速的3.22次方成正比，并随灰粒子的浓度增大而增大。单从理论上讲，降低磨损应从降低烟气流速，减小灰粒子浓度和减小粒子的颗粒直径入手。
 本文档将从循环流化床锅炉的基本工作原理，结构特点等方面进行阐述，从而总结出循环流化床锅炉磨损的主要机理，进而分析循环流化床锅炉各部件原因及其预防措施。
 
 关 键 词：循环流化床；锅炉；防磨；措施
 
 文档类型：理论研究
  Title: The circulating fluidized bed boiler wear and prevent grind measures
ABSTRACT
 
 
 Circulating fluidized bed boiler (CFB) in China in recent years, is a new and circulating fluidized-bed combustion equipment, burning technology development with its high efficiency low pollution and high performance is improved by leaps and bounds. In today's increasingly strict environmental protection request, has become the most CFB boiler combustion equipment, but the future, compared with other boiler CFB wear comparison.
 The circulating fluidized bed boiler heating wear is normal operation of circulating fluidized bed boiler (wear, three threat to coal, slag discharge difficult, because wear (one), heating, refractories, cap, etc) to stop accident furnace 50% of the total. In a long time become circulating fluidized bed boiler popularization and application of the main obstacles.
 Wear in engineering is often due to mechanical causes for the grain of material surface caused by stripping off that don't want a gradual change, such as thinned, craze. Boiler common wear that high grey particles from different angles of heating furnace wall or scouring collision caused by the changes. There is introduced, abrasion and data of smoke 3.22 times quickly and with ash is directly proportional to the particle concentration increases. Single theoretically, reducing wear should reduce gas velocity of particle concentration decreased gray, and minimize the particle diameter of particles.
 This paper will be from the circulating fluidized bed boiler, the basic working principle of this structure characteristics, etc, and summarizes the circulating fluidized bed boiler wear mechanism of circulating fluidized bed boiler, and analyzes the reason and its components preventive measures.

KEY WORDS: Circulating fluidized bed;Boiler;Mill;measures

TYPE OF THESIS: Theory research

目  录
摘　要 I
ABSTRACT III
目  录 V
1 绪 论 1
2 循环流化床锅炉基本原理 2
 2.1 CFB的发展简况 循环流化床的发展概况 2
 2.2 CFB的原理 2
 2.3 CFB基本概念 5
 2.4 CFB的结构与优缺点 7
3 循环流化床锅炉磨损机理及防范措施 12
 3.1 磨损的概念 12
 3.2 循环流化床锅炉磨损可能产生的部位及预防措施 16
 3.3案例分析 21
4 结论与展望 23
5 致    谢 25
6 参考文献 27
7 附    录 28

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