發(fā)布時間：2018-04-26 09:40

  本文選題：儲罐 + 腐蝕　； 參考：《東北石油大學(xué)》2016年碩士論文

【摘要】：儲罐在工作時由于受到內(nèi)部介質(zhì)的腐蝕,殼體壁厚會不斷減薄且局部區(qū)域會出現(xiàn)腐蝕缺陷,這將削弱儲罐的強(qiáng)度,嚴(yán)重時將對人民群眾的生命財產(chǎn)安全以及自然環(huán)境造成很大程度上的破壞。為了研究在役儲罐在受到腐蝕后的應(yīng)力狀態(tài),本文根據(jù)GB150設(shè)計了一臺容積為4.5m3的液氨儲罐,對其建立不同腐蝕狀況下液氨儲罐整體和局部的有限元模型,對整體和局部結(jié)構(gòu)的腐蝕應(yīng)力場進(jìn)行了分析與安全評定,評價了儲罐的剩余強(qiáng)度。其中有限元分析主要分為五個部分,分別是未發(fā)生腐蝕時儲罐整體結(jié)構(gòu)的有限元分析和應(yīng)力評定;受到均勻腐蝕的儲罐整體結(jié)構(gòu)的應(yīng)力和位移隨腐蝕厚度的變化分析和安全評定;未發(fā)生腐蝕時儲罐筒體與人孔接管區(qū)的有限元分析和應(yīng)力評定;受到均勻腐蝕后儲罐筒體與人孔接管區(qū)的應(yīng)力和位移隨腐蝕厚度的變化分析和安全評定;含有兩個腐蝕缺陷時儲罐局部結(jié)構(gòu)的應(yīng)力和位移隨缺陷深度變化的分析和安全評定。通過有限元分析軟件ANSYS建立模型、施加工作載荷并對儲罐進(jìn)行結(jié)構(gòu)分析,通過歸納與總結(jié)得出結(jié)論如下:不同腐蝕程度下的液氨儲罐的最大應(yīng)力出現(xiàn)在支座腹板上,同時下封頭的應(yīng)力分布較為復(fù)雜,儲罐人孔接管結(jié)構(gòu)的最大應(yīng)力出現(xiàn)在開孔部位的接管內(nèi)壁面上,通過對危險截面的線性化分析可知,受到均勻腐蝕的液氨儲罐在設(shè)計使用年限能夠安全運行,且人孔接管結(jié)構(gòu)均滿足強(qiáng)度要求;儲罐下封頭應(yīng)力集中處存在的腐蝕坑對儲罐強(qiáng)度的削弱作用隨缺陷深度的增大而增大,大大縮減了儲罐的使用壽命。
[Abstract]:Because the tank is corroded by internal medium, the wall thickness of the shell will be thinned and corrosion defects will appear in the local area, which will weaken the strength of the tank. When serious, it will damage the people's life and property safety and the natural environment to a great extent. In order to study the stress state of in-service storage tank after corrosion, a liquid ammonia tank with volume of 4.5m3 was designed according to GB150, and the whole and local finite element models of liquid ammonia storage tank under different corrosion conditions were established. The corrosion stress field of whole and local structures is analyzed and safety assessment is carried out, and the residual strength of storage tank is evaluated. The finite element analysis is mainly divided into five parts, which are the finite element analysis and stress assessment of the whole structure of the storage tank without corrosion. The variation of stress and displacement with corrosion thickness and the safety evaluation of the whole structure of the tank subjected to uniform corrosion are analyzed, and the finite element analysis and stress assessment of the tank tube and manhole nozzle area without corrosion occur. The variation of stress and displacement with corrosion thickness and the safety assessment of the stress and displacement of the tank tube and manhole nozzle after uniformly corroded, and the analysis and safety evaluation of the stress and displacement of the local structure of the storage tank with two corrosion defects with the depth of the defect are analyzed. The finite element analysis software ANSYS is used to establish the model, to apply the working load and to analyze the structure of the storage tank. The conclusions are as follows: the maximum stress of the liquid ammonia tank with different corrosion degree appears on the supporting web. At the same time, the stress distribution of the lower head is more complex, and the maximum stress of the manhole nozzle structure of the storage tank appears on the inner surface of the nozzle at the open hole. Through the linearization analysis of the dangerous section, it can be seen that, The uniformly corroded liquid ammonia storage tank can operate safely in design life, and the structure of manhole nozzle can meet the strength requirement. The effect of corrosion pit on the strength of the storage tank increases with the increase of the depth of the defect, which greatly reduces the service life of the tank.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TQ053.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 張偉;雷云;王海東;王軍;;基于Fluent數(shù)值模擬的液氨儲罐泄漏擴(kuò)散危險性研究[J];環(huán)境工程;2015年S1期

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本文編號：1805466