本文選題：LNG儲罐 + 簡化模型　； 參考：《哈爾濱工程大學》2013年碩士論文

【摘要】：液化天然氣(Liquefied Natural Gas,簡稱LNG)作為一種使用安全,熱值高,潔凈等諸多優(yōu)勢的能源,日益改變著我國能源結(jié)構(gòu)的布局。面對高速的發(fā)展的LNG產(chǎn)業(yè),大型LNG儲罐的建造成本卻居高不下,其原因在于缺少自主設計建造的技術(shù)。另一方面,LNG屬于超低溫、易燃、易爆物質(zhì),一旦發(fā)生泄漏,將產(chǎn)生嚴重的次生災害,LNG儲罐抗震性能就顯得尤為重要。鑒于此,進行相關(guān)LNG儲罐抗震性能的研究具有重要的意義。本文以存儲量為16萬立方米大型LNG儲罐為例,采用相關(guān)儲液罐地震響應分析理論對其內(nèi)罐進行動液壓力,底部剪力以及傾覆彎矩分析,并與有限元軟件ABAQUS分析結(jié)果進行對比,評價LNG儲罐的抗震性能。 首先本文根據(jù)結(jié)構(gòu)形式的不同,總結(jié)了對比了單容罐、雙容罐、全容罐以及薄膜罐各自的特點,并對目前廣泛采用的全容罐作了較詳細的介紹,對建造LNG儲罐的選擇有借鑒意義。 其次采用相關(guān)儲液罐地震響應分析理論,從僅考慮地震作用下儲液對罐壁的沖擊作用,而忽略儲液液面的晃動作用,和考慮儲液隨地面運動對罐壁的沖擊作用、儲液因罐壁變形與罐壁的耦聯(lián)振動作用、儲液面液體晃動兩個方面對LNG儲罐內(nèi)罐進行地震響應分析,前者考慮儲液罐壁面為剛性,后者考慮儲液罐罐壁為柔性。將理論分析結(jié)果與鋼制儲罐抗震標準對比驗證,可知剛性罐壁理論計算結(jié)果偏于危險,簡化的Haroun-Housner方法與規(guī)范計算結(jié)果相近,罐壁底部應力在安全范圍之內(nèi)。 然后采用有限元分析軟件ABAQUS對LNG儲罐進行地震時程分析,考慮到傳統(tǒng)的數(shù)值模擬流固耦合作用計算效率很低,本文結(jié)合前述理論分析將地震作用下儲液產(chǎn)生的動液壓力等效為附加在壁面的質(zhì)量,等效為慣性力作用,計算效率有很大提高。分別對LNG儲罐內(nèi)罐以及考慮混凝土外罐及保溫層整體模型進行分析,可知LNG儲罐外罐及保溫層較好的限制了內(nèi)罐的徑向變形,在8度多遇地震作用下,儲罐地震反應較小。
[Abstract]:As a kind of safe, high calorific and clean energy, LNG Natural Gas (lg) is changing the layout of energy structure of our country day by day. In the face of the rapid development of LNG industry, the construction cost of large LNG storage tanks remains high, which is due to the lack of independent design and construction technology. On the other hand, LNG belongs to ultra-low temperature, flammable and explosive materials. Once leakage occurs, serious secondary disasters will occur and the seismic performance of LNG storage tanks is particularly important. In view of this, it is of great significance to study the seismic behavior of LNG tanks. Taking the large LNG storage tank with a storage capacity of 160000 cubic meters as an example, the dynamic fluid pressure, bottom shear force and overturning bending moment of the inner tank are analyzed by using the seismic response analysis theory of the relevant liquid storage tank, and the results are compared with the results of the finite element software ABAQUS. The seismic performance of LNG storage tank is evaluated. Firstly, according to the different structural forms, this paper summarizes and compares the characteristics of single tank, double tank, full tank and thin film tank, and introduces in detail the full tank which is widely used at present. It can be used for reference in the construction of LNG storage tank. Secondly, based on the theory of seismic response analysis of liquid storage tank, considering the impact of storage fluid on tank wall only under seismic action, ignoring the sloshing of liquid storage surface, and considering the impact of storage fluid with ground motion on tank wall, Because of the deformation of the tank wall and the coupled vibration of the tank wall, the seismic response of the LNG tank is analyzed from two aspects of liquid sloshing on the storage surface. The former considers the wall rigidity of the storage tank and the latter considers the flexibility of the tank wall. By comparing the theoretical analysis results with the seismic standards of steel storage tanks, it can be seen that the theoretical calculation results of rigid tank walls tend to be dangerous, the simplified Haroun-Housner method is close to the calculated results of the code, and the stress at the bottom of the tank wall is within the safe range. Then the finite element analysis software ABAQUS is used to analyze the seismic time history of the LNG tank, considering the low efficiency of the traditional numerical simulation of fluid-solid coupling. In this paper, the dynamic hydraulic force produced by the liquid storage under seismic action is equivalent to the mass attached to the wall and the inertial force, and the calculation efficiency is greatly improved. By analyzing the internal tank of LNG tank and the integral model of considering concrete external tank and insulation layer, it can be seen that the external tank and insulation layer of LNG tank limit the radial deformation of the inner tank well, and the seismic response of the storage tank is small under the action of 8 degree earthquake.
【學位授予單位】：哈爾濱工程大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TE972;TU311.3

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