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Experimental and numerical modal analysis of wall tubes in the coal-fired boiler or radiant syngas cooler
The Canadian Journal of Chemical Engineering ( IF 2.1 ) Pub Date : 2021-08-15 , DOI: 10.1002/cjce.24294
Lintao Shao 1 , Wei Guo 2 , Weijuan Yang 1 , Zhiwen Xia 3 , Jianping Kuang 3 , Zhijun Zhou 1
Affiliation  

The slag deposited on the wall tubes in the coal-fired boiler or radiant syngas cooler (RSC) of the entrained flow gasifier could reduce the heat transfer efficiency and degrade the tubes by corrosion. During the operation of the boiler or RSC, the rapping-off-ash method is an effective method to remove slag deposits, especially in a high-pressure environment. The operating parameters of the rapping-off-ash method are related to the modal parameters of wall tubes, including the natural frequency, damping ratio, and mode shapes. In this study, modal parameters of wall tubes composed of three single tubes and fins were experimentally determined through the modal test analysis under both empty and water-filled conditions. The dynamic characteristics of wall tubes were extracted by using the roving hammer-impact test and the frequency response function (FRF). A numerical simulation based on the finite element method in ABAQUS was conducted to compare with the experimental modal analysis. The first five natural modes ranged from 14 to 154 Hz, and the maximum vibration or torsion locations of wall tubes under the corresponding mode frequencies were investigated. The water inside the wall tubes could reduce the stiffness of the structure and decrease the values of natural frequency.

中文翻译:

燃煤锅炉或辐射合成气冷却器壁管的实验和数值模态分析

熔渣沉积在燃煤锅炉或气流床气化炉的辐射合成气冷却器 (RSC) 的壁管上会降低传热效率并因腐蚀而使管道退化。在锅炉或 RSC 运行过程中,振打灰法是一种有效的清除炉渣沉积物的方法,尤其是在高压环境中。振打灰法的运行参数与壁管的模态参数有关,包括固有频率、阻尼比和振型。本研究通过空载和充水条件下的模态试验分析,实验确定了由三个单管和翅片组成的壁管的模态参数。采用粗纱锤击试验和频响函数(FRF)提取壁管动态特性。ABAQUS中基于有限元法的数值模拟与实验模态分析进行了比较。前五种固有模式的范围为 14 至 154 Hz,并研究了在相应模式频率下壁管的最大振动或扭转位置。壁管内的水会降低结构的刚度并降低固有频率值。并研究了相应模态频率下壁管的最大振动或扭转位置。壁管内的水会降低结构的刚度并降低固有频率值。并研究了相应模态频率下壁管的最大振动或扭转位置。壁管内的水会降低结构的刚度并降低固有频率值。
更新日期:2021-08-15
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