- 摘 要
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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(nèi)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(zāi)作用下LNG混凝土儲罐罐頂端部分的高溫力學(xué)性能進(jìn)行了分析研究。分析中除了考慮由溫度引起的材料力學(xué)性能劣化效應(yīng)，還在考慮了瞬態(tài)熱應(yīng)變的影響。以16萬m3混凝土儲罐為例，給出了泄放閥火災(zāi)作用下LNG混凝土儲罐罐頂和鋼質(zhì)穹頂?shù)臏囟葓龊蜏囟葢?yīng)變的分布情況。結(jié)果表明：泄放閥火災(zāi)作用僅在罐頂和罐壁頂端產(chǎn)生影響；通過溫度和溫度應(yīng)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(yīng)預(yù)埋熱電偶，以便于實時監(jiān)測混凝土的最高溫度。分析結(jié)果對于提高我國大型LNG預(yù)應(yīng)力混凝土儲罐的設(shè)計水平具有一定的參考價值。
[關(guān)鍵詞] 儲罐；預(yù)應(yīng)力混凝土；LNG；溫度場；泄放閥
中圖分類號：TU234.1 文獻(xiàn)標(biāo)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
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