LNG接收站用BOG压缩机低温活塞应力分析  被引量:2

Stress Analysis of Low-Temperature Piston of BOG Compressor Used in LNG Terminal

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作  者:高洁 张宇鹏 丁乙[3] 王小尚[4] 李云[1] GAO Jie;ZHANG Yu-peng;DING Yi;WANG Xiao-shang;LI Yun(School of Chemical Engineering and Technology,Xi'an Jiaotong University,Xi'an 710049,China;Sinopec Engineering Incorporation,Beijing 100029,China;Sinopec Tianjin Liquefied Natural Gas Co.,Ltd.,Tianjing 300450,China;Sinopec Natural Gas Branch,Beijing 100029,China)

机构地区:[1]西安交通大学化学工程与技术学院,陕西西安710049 [2]中国石化工程建设有限公司,北京100029 [3]中国石化天津液化天然气有限责任公司,天津300450 [4]中国石化天然气分公司,北京100029

出  处:《压缩机技术》2021年第6期1-7,共7页Compressor Technology

摘  要:BOG压缩机是LNG接收站的关键设备之一,保证其安全运行十分重要。由于进气温度低,其活塞承受宽幅温度变化。通过建立活塞传热模型和力学模型,分析了BOG压缩机预冷启动及运行工况下活塞的温度和应力变化。研究表明:启动过程和运行中活塞温度分布不均匀,中间毂部温度高于端面温度。温差造成活塞在加强筋与端面连接处产生较大的应力。改进活塞结构后最大应力从426.4 MPa降低至256.95 MPa,应力分布情况得到了改善。BOG compressor is one of the key equipments of LNG terminal.For this reason,it is essential to ensure its safe operation.Due to the suction temperature is low,so its piston undergoes severe temperature changes.This paper established the heat transfer model and mechanical model of piston and studied the changes of temperature and stress of BOG compressor piston under the pre-cooling start process and operating conditions.It is concluded that the temperature distribution is uneven during start-up and operation,and the temperature of the middle hub is higher than the temperature of cover plate,which caused a relatively large stress on the connecting position between the rib and the cover plate of piston.After the improvement of piston structure,the maximum stress is reduced from 426.4 MPa to 256.95 MPa,as a result the stress condition of the piston has been improved.

关 键 词:BOG压缩机 低温活塞 应力 瞬态传热 LNG接收站 

分 类 号:TH45[机械工程—机械制造及自动化]

 

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