大型LNG全容罐不同焊接方法的经济性分析

Analysis of the Economy of Different Welding Methods in Large LNG Full Containment Tank

在“碳中和”背景下,LNG储罐作为低温LNG清洁能源的重要储存装备,近年来逐步向大型化和高效化发展,同时低温储罐建造周期进一步压缩给工程建设质量和成本带来了更多的挑战。焊接作为低温储罐施工中的重要作业环节,直接关系到LNG储罐建造过程的经济性。焊接方法的不同,将直接影响焊接人工成本、焊接材料采购费用和焊接设备费用,进而影响项目建造成本。以27万立方米9%Ni钢LNG全容罐为例,选取钢穹顶、承压环、内罐的三个典型部位,对比分析不同焊接方法的经济性,结果表明熔化极药芯焊丝气体保护焊、氩弧机动焊和埋弧焊的应用,降低了建造成本,提高了经济性。

In the context of“carbon neutrality”,LNG storage tanks,as important storage equipment for low temperature liquefied natural gas,have gradually developed towards large-capacity and high-efficiency in recent years.Moreover,the construction period of low-temperature storage tanks has been further compressed,bringing more challenges to the quality and cost of construction.Welding is an important process in the construction of low-temperature storage tanks,and directly affects the economy of LNG storage tank construction.Different welding methods directly affect the cost of welding labor,welding material procurement,and welding equipment costs,which directly affecting project construction costs.Taking 270,000 m39%Nisteel LNG full-containment tank as an example,three typical parts including steel dome,pressure ring,and inner tank are selected for comparative analysis of the economy of different welding methods.The analysisindicate that the application of gas shielded melting welding,argon arc motor welding,and submerged arc welding reduce construction costs and improve economy.