大型LNG双金属壁和三金属壁全容罐对比
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摘要
考虑到大型LNG接收站中采用混凝土次容器的全容罐造价过高、制造安装工艺复杂,针对城市调峰和液化厂项目中公称容积5×10~4m~3以下的LNG储罐,根据GB/T 26978—2011《现场组装立式圆筒平底钢质液化天然气储罐的设计与建造》等标准规范的要求,设计了性价比更高的金属壁全容罐。虽然相关标准对金属壁全容罐有所定义,但是此种储罐国外尚未有先例,国内的实例较少。以某地在建的1台25 000 m~3全容罐作为分析对象,对LNG双金属壁全容罐、三金属壁全容罐的结构形式、绝热性能、施工工艺、施工工期、造价进行对比分析,分析两种结构的优缺点。双金属壁全容罐和三金属壁全容罐各方面指标均能够达到标准规范中金属壁全容罐的要求。双金属壁全容罐和三金属壁全容罐在占地面积、工程造价以及施工工期方面无明显的差异。三金属壁全容罐在绝热性能以及施工工艺方面,比双金属壁全容罐具有一定优势,更加安全可靠和节能。
Considering the high cost and complicated manufacturing and installation process of fullcontainment tank using concrete sub-container in large LNG receiving stations,aimed at LNG storage tanks with nominal volume of 5 × 104 m3 or less in urban peak shaving and liquefaction plant projects,a more cost-effective metal wall full-containment tank is designed according to the requirements of Design and Manufacture of Site Built,Vertical,Cylindrical,Flat-bottomed Steel Tanks for the Storage of Liquefied Natural Gases( GB/T 26978-2011) and other standard specifications. Although there is a definition of metal wall tank in relevant standards,there is no precedent in foreign countries for this kind of tank,and there are few examples in our country. Taking a 25 000 m~3 full-containment tank under construction in a certain place as an analysis object,the structural type,thermal insulation performance,construction technology,construction period and cost of LNG bimetallic wall full-containment tank and trimetallic wall full-containment tank are compared and analyzed. The advantages and disadvantages of the two structures are analyzed. All the indicators of the bimetallic wall full-containment tank and the trimetallic wall full-containment tank can meet the requirements of the metal wall full-containment tank in the standard specifications. There is no significant difference in the floor space,construction cost and construction period between the bimetallic wall full-containment tank and the trimetallic wall full-containment tank.The trimetallic wall full-containment tank has certain advantages over the bimetallic wall full-containment tank in terms of thermal insulation performance and construction technology,and is more safe,reliable and energy-saving.
Considering the high cost and complicated manufacturing and installation process of fullcontainment tank using concrete sub-container in large LNG receiving stations,aimed at LNG storage tanks with nominal volume of 5 × 104 m3 or less in urban peak shaving and liquefaction plant projects,a more cost-effective metal wall full-containment tank is designed according to the requirements of Design and Manufacture of Site Built,Vertical,Cylindrical,Flat-bottomed Steel Tanks for the Storage of Liquefied Natural Gases( GB/T 26978-2011) and other standard specifications. Although there is a definition of metal wall tank in relevant standards,there is no precedent in foreign countries for this kind of tank,and there are few examples in our country. Taking a 25 000 m~3 full-containment tank under construction in a certain place as an analysis object,the structural type,thermal insulation performance,construction technology,construction period and cost of LNG bimetallic wall full-containment tank and trimetallic wall full-containment tank are compared and analyzed. The advantages and disadvantages of the two structures are analyzed. All the indicators of the bimetallic wall full-containment tank and the trimetallic wall full-containment tank can meet the requirements of the metal wall full-containment tank in the standard specifications. There is no significant difference in the floor space,construction cost and construction period between the bimetallic wall full-containment tank and the trimetallic wall full-containment tank.The trimetallic wall full-containment tank has certain advantages over the bimetallic wall full-containment tank in terms of thermal insulation performance and construction technology,and is more safe,reliable and energy-saving.
引文
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[6]张新建,陈美全,姚佐权.大型LNG单容罐保冷结构设计及绝热验算[J].化工设备与管道,2012,49(3):30-34.
[2]曹岩.双金属壁全包容式低温储罐:201510249394. 9[P]. 2015-07-29.
[3]刘明. LNG全容罐热角保护结构有限元分析[J].压力容器,2013,30(12):38-43.
[4]郭旭,罗晓钟,何江山.带有次容器保护层的金属全容式储罐:201520876504. X[P]. 2016-03-23.
[5]姚佐权,张新建,朱金花. 30 000 m3LNG单容罐系统设计[J].煤气与热力,2015,35(11):B12-B17.
[6]张新建,陈美全,姚佐权.大型LNG单容罐保冷结构设计及绝热验算[J].化工设备与管道,2012,49(3):30-34.