Purpose

Due to the abundant use of granular materials in chemical industries, it is inevitable to store raw materials and products in bulk in silos. For this reason, much research has been carried out in the field of construction, operation and maintenance of silos. One of the important issues that must be investigated in silos is the behavior of their structure when the materials inside them are unloaded. Structural vibrations and the creation of normal noise usually discharge the granular of material from the silo. Both of phenomena are undesirable due to the problems they can cause to the structure and its surroundings. According to the said issues, this paper aims to investigate the vibration problem of the sulfur storage silo of the first refinery during discharge with the help of measuring experimental vibration data and simulating the silo model.

Design/methodology/approach

In the experimental investigation, the main cause of the vibration of the 400-ton silo in the refinery is used. The mass asymmetry phenomenon when the silo is filled is also considered. The experimental results are authenticated by software analysis too.

Findings

The results showed that the natural frequency of the ninth mode is almost equal to the natural frequency of sulfur discharge from the silos and has the largest shape change in the structure and vibration range. It is also concluded that the larger sulfur silo (400 tons) should be prioritized over the smaller sulfur silo (200 tons) in the emptying program, and the 400 tons silo should never be emptied even through the 200 tons silo is empty.

Originality/value

An attempt is made to investigate the issue of vibration in sulfur storage silos in the first refinery of South Pars in the form of experimental investigation and modal analysis.

中文翻译：

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硫磺储存库振动的数值与试验研究

 目的

由于化工行业大量使用颗粒物料，不可避免地需要在筒仓中散装储存原材料和产品。为此，在筒仓的建造、运行和维护领域进行了大量的研究。筒仓中必须研究的重要问题之一是筒仓内部材料卸载时其结构的行为。结构振动和正常噪音的产生通常会将颗粒状材料从筒仓中排出。这两种现象都是不受欢迎的，因为它们会给结构及其周围环境带来问题。针对上述问题，本文旨在通过测量实验振动数据和模拟筒仓模型，研究第一炼厂硫磺储存筒卸料过程中的振动问题。

设计/方法论/途径

在实验研究中，采用了炼油厂400吨筒仓振动的主要原因。还考虑了筒仓填充时的质量不对称现象。实验结果也通过软件分析得到验证。

 发现

结果表明，第九振型的固有频率几乎等于筒仓卸硫的固有频率，并且在结构和振动范围内具有最大的形状变化。并得出结论：在清空方案中，应优先考虑较大的硫磺库（400吨），而较小的硫磺库（200吨），即使200吨库已空，也绝不应清空400吨库。

 原创性/价值

尝试通过实验研究和模态分析的形式研究南帕尔斯第一炼油厂硫磺储存仓的振动问题。