发电厂脱硫脱硝改造中锅炉钢架结构安全性研究

发布时间：2018-03-27 15:23

本文选题：锅炉钢结构　切入点：脱硫脱硝改造　出处：《中冶集团建筑研究总院》2014年硕士论文

【摘要】：随着人们环境保护意识的不断提高,国家对发电厂污染物排放的要求日趋严格。2009年以来,关于控制氮氧化物和二氧化硫排放的政策不断出台,火力(燃煤)发电厂烟气脱硫、脱硝治理已全面展开。本课题,研究了既有锅炉钢架结构安全性鉴定分析的一般方法；针对某发电机组脱硫脱硝改造,采用空间结构有限元模型,对锅炉钢架结构安全性及抗震性能进行了鉴定研究。文中,针对锅炉钢结构的特点,研究提出了锅炉钢架使用条件调查与检测要点、结构现状调查与检测要点等；研究提出了悬吊锅炉在空间结构计算模型中的一种表达方式：研究分析了《锅炉钢结构设计规范》GB/T22395-2008与现行建筑结构设计系列规范,在荷载分项系数、承载能力调整系数等主要方面存在的差异；参照《工业建筑可靠性鉴定标准》GB50144-2008有关规定,提出了有关锅炉钢结构安全性鉴定评估的方法；指出了按照《工业构筑物抗震鉴定标准》GB50117进行抗震鉴定应注意的有关问题。通过工程实例,比较研究了锅炉及制晃装置结构不同的模型表达对计算分析结果的影响；比较分析了底部剪力法、振型分解反应谱法、时程分析方法诸分析方法对钢架结构抗震分析结果产生的影响；对实例锅炉钢架脱硫脱硝改造后结构的安全性及抗震性能进行了评估,并提出了进一步处理的意见及建议。通过研究比较,建议了目前进行既有锅炉钢结构安全性鉴定评估、抗震鉴定等应采用振型分解反应谱法或时程分析方法,并应建立空间结构模型,其中,制晃装置应按照构件的实际特性建模,锅炉本体可按照刚体建模。
[Abstract]:With the increasing awareness of environmental protection, the requirements for pollutant emissions from power plants have become increasingly stringent. Since 2009, policies on controlling nitrogen oxides and sulphur dioxide emissions have been introduced, and flue gas desulphurization in coal-fired power plants, The general method of safety appraisal and analysis of existing boiler steel frame structure is studied, and the finite element model of space structure is adopted for desulfurization and denitrification transformation of a generator set. The safety and aseismic performance of boiler steel frame structure are evaluated and studied. According to the characteristics of boiler steel structure, the main points of investigation and detection of boiler steel frame usage conditions, structural status quo investigation and detection points are put forward in this paper. In this paper, a kind of expression of suspended boiler in spatial structure calculation model is put forward. The GB/T22395-2008 code for boiler steel structure design and the series code for building structure design in force are studied and analyzed. According to the relevant regulations of GB50144-2008, this paper puts forward a method for evaluating the safety of boiler steel structure. The paper points out some problems that should be paid attention to in seismic identification according to GB50117. Through engineering examples, the influence of different model expression of boiler and shaking device on calculation and analysis results is compared and studied. The effects of bottom shear method, mode decomposition response spectrum method and time-history analysis method on the seismic analysis results of steel frame structures are compared and analyzed. This paper evaluates the safety and seismic performance of the structure after desulphurization and denitrification of boiler steel frame, and puts forward some opinions and suggestions for further treatment. Through the study and comparison, it is suggested that the existing boiler steel structure should be evaluated and evaluated at present. Seismic identification should be done by using the mode decomposition response spectrum method or time-history analysis method, and the spatial structure model should be established, in which the shaking device should be modeled according to the actual characteristics of the component, and the boiler body should be modeled according to the rigid body.
【学位授予单位】：中冶集团建筑研究总院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391

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