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蘇 娟， 周美珍， 魏會東
（海洋石油工程股份有限公司，天津300451）[摘要] 隨著國內LNG需求量的逐漸增大，對LNG混凝土儲罐的高容積和安全性提出了更高的要求。借助于ANSYS有限元軟件，對泄放閥火災作用下LNG混凝土儲罐罐頂端部分的高溫力學性能進行了分析研究。分析中除了考慮由溫度引起的材料力學性能劣化效應，還在考慮了瞬態(tài)熱應變的影響。以16萬m3混凝土儲罐為例，給出了泄放閥火災作用下LNG混凝土儲罐罐頂和鋼質穹頂?shù)臏囟葓龊蜏囟葢兊姆植记闆r。結果表明：泄放閥火災作用僅在罐頂和罐壁頂端產生影響；通過溫度和溫度應力的分布情況，可校核火焰的位置和高度；在計算分析中確定的最高溫度處應預埋熱電偶，以便于實時監(jiān)測混凝土的最高溫度。分析結果對于提高我國大型LNG預應力混凝土儲罐的設計水平具有一定的參考價值。
[關鍵詞] 儲罐；預應力混凝土；LNG；溫度場；泄放閥
中圖分類號：TU234.1 文獻標識碼：A 文章編號：1002-848X(2011) S2-0191-04Hight temperature analysis of LNG prestressed concrete tank for relief valve fire
Su Juan, Zhou Meizhen, Wei Huidong
( Offshore Oil Engineering Co., Ltd., CNOOC, Tianjin 300451, China)Abstract: As the demand of LNG in Cluna mcreases, there is higher requirement for the big volume and safety of LNG concrete tank. Investigation of high temperature mechanical properties of top LNG concrete tank under relief valve fire condition is done. Both the degradation effect of material mechanical properties by temperature and transient thermal strain are considered. As an example of 160,000 cubic meters concrete tank, the distribution of temperature field and thermal strain of top LNG concrete tank and steel dome under relief valve fire condition is given. The results show that there is effect only in the top tank and the top of tank wall under relief valve fire condition. By the distribution of temperature and thermal strain, the position and height of flame can be checked. Thermal couples should be embedded in the part of highest temperature by calculation anlyses in order to monitor the realtime temperature of the concrete. The analyses have some reference values for improving the level of desigrung large LNG prestressed concrete tank in our country.
Keywords: tank; prestressed concrete; LNG; temperature field; relief valve
