600MW机组磨煤机耐磨材料应用研究

发布时间：2018-01-14 09:17

  本文关键词：600MW机组磨煤机耐磨材料应用研究　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 磨煤机 磨损机理 陶瓷金属复合材料 设备监理

【摘要】：随着国民经济的快速发展,对电力需求的增长也越来越快,电力行业得到了长足的发展。对此要求电厂能够稳定长时间运行而不发生故障停运。这对制粉系统提出了新的要求。磨煤机是电厂制粉系统的关键设备,本文分别介绍了电厂中使用的磨煤机的种类和特点,并以使用最广泛的辊式中速磨为例对其磨损问题进行了分析。根据实验以及国内外文献概括总结了辊式中速磨的磨损机理和实际运行过程中对磨损影响较大的因素。本文还通过对常用的磨损修复材料例如碳化钨合金、高铬铸铁药芯焊丝和磨损修复工艺例如堆焊、激光熔覆技术进行对比分析,得出各自的优势和劣势,并提出一种新型的陶瓷金属复合材料的堆焊修复工艺。利用所提出的陶瓷金属复合材料制备了三套磨煤机辊套,并在某厂磨煤机上进行防磨改造安装使用,因改造项目的复杂性,对项目进行了设备监理,编制了监理大纲和监理细则的主要原则,利用主动控制方法,针对项目进行中可能出现的不利因素进行分析,在项目实施质量方面进行了事前、事中、事后三个阶段的质量控制措施,从设计监理、监造监理、安装监理几个方面并对项目进行全过程管理,从而消除对磨辊防磨治理效果影响的外界不利因素,实验结果和实际运行情况表明,使用陶瓷金属复合材料堆焊的磨辊,磨辊的连续运行时间延长一倍,且保证磨煤机运行期间一直处于在经济出力状态下,使用结果令人满意,效果显著。
[Abstract]:With the rapid development of the national economy, the demand for electricity is growing faster and faster. The electric power industry has made great progress, which requires the power plant to run steadily for a long time without malfunction. This puts forward a new requirement for the pulverizing system. The coal mill is the key equipment of the power plant pulverizing system. This paper introduces the types and characteristics of coal mills used in power plants. The wear problem of roller medium speed mill is analyzed by taking the most widely used medium speed mill as an example. According to the experiment and domestic and foreign literature, the wear mechanism of roller medium speed mill and the cause that has great influence on wear in actual operation are summarized. This article also deals with common wear repair materials such as tungsten carbide alloys. High chromium cast iron flux-cored wire and wear repair technology such as surfacing, laser cladding technology were compared and analyzed, and their respective advantages and disadvantages were obtained. A new surfacing and repairing technology of ceramic metal composite was put forward. Three sets of roller sleeve of coal mill were prepared by using the ceramic metal composite, and the anti-wear modification installation was carried out on the mill. Because of the complexity of the reconstruction project, the equipment supervision is carried out, the main principles of supervision outline and supervision rules are compiled, and the unfavorable factors that may appear in the project are analyzed by using the active control method. In the implementation of the quality of the project carried out in advance, in the matter, after the three stages of quality control measures, from the design supervision, supervision supervision, installation supervision of several aspects of the project and the whole process of management. The results of experiment and actual operation show that the continuous running time of grinding roller with ceramic metal composite surfacing welding can be doubled by eliminating the external unfavorable factors that affect the anti-wear effect of grinding roll. The result of experiment and actual operation shows that the continuous running time of grinding roll is twice as long as that of ceramic metal composite surfacing welding. And ensure that the mill has been in the state of economic output during operation, the results are satisfactory, and the effect is remarkable.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
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本文编号：1422960