某大型火电厂煤斗振动故障研究

蒋向华 张 辉

振动与冲击 ›› 2009, Vol. 28 ›› Issue (1) : 186-190.

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PDF(1666 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (1) : 186-190.
论文

某大型火电厂煤斗振动故障研究

  • 蒋向华 张 辉
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VIBRATION ANALYSIS AND TREATMENT FOR THE SCUTTLES OF A THERMO-ELECTRIC POWER STATION

  • JIANG Xianghua ZHANG Hui
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摘要

针对某大型火电厂发生的煤斗振动破坏故障,结合电厂事故记录和现场勘察测量结果,初步判断该振动属于冲击型结构动力学瞬态响应问题;利用有限元方法,通过结构静力学和瞬态动力学计算,模拟煤斗静平衡状态和产生振动的过程。计算结果表明,数值模拟所描述的煤斗振动规律及破坏规律符合煤斗现场勘察的实际振动规律和破坏规律,说明最初对煤斗振动性质的判断是较为可信的。计算结果同时表明煤斗发生破坏的直接原因是煤斗支撑框架钢性的左右不对称性。在此基础上,又进一步推断煤斗振动的激励来自于煤料的堵塞,并从煤斗自身结构的特殊性、截面收缩率、煤料潮湿性及材料间摩擦系数等多方面出发,分析了产生煤堵的原因。最后在结合相关经验的基础上,提出了高分子双曲型内衬及阻落装置方案,以解决煤斗产生振动的问题。

Abstract

Violent vibration with component broken appeared in the scuttles of a thermal-electric power station. By the help of the industrial accident record and on-spot inspection, transient response induced by some kind of impaction was initially deduced to be the cause of this vibration. Using FEM, transient dynamic analysis as well as static analysis was carried out to study this scuttle system. Result shows the scuttle vibrates and breaks in the same way with the actual ones, which reveals that the initial deduction is reliable. Result also indicates this broken is caused by the stiffness asymmetry in the braced frame. Based on this, it was inferred that the vibration was excited by the impulsion to the scuttle of the falling coal which is previously jammed and now collapsing. Many factors of coal jamming were analyzed, including the structure features, reduction of area, coal humidity and friction factor. Two treatments, high polymer material hyperbolic inner lining and anti-drop device, were finally presented in order to reduce the impaction and vibration

关键词

冲击 / 振动 / 有限元 / 煤斗 / 堵煤

Key words

impact / vibration / FEM / coal scuttle / coal jamming

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导出引用
蒋向华 张 辉 . 某大型火电厂煤斗振动故障研究[J]. 振动与冲击, 2009, 28(1): 186-190
JIANG Xianghua ZHANG Hui. VIBRATION ANALYSIS AND TREATMENT FOR THE SCUTTLES OF A THERMO-ELECTRIC POWER STATION[J]. Journal of Vibration and Shock, 2009, 28(1): 186-190

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