真空相变炉在魏荆线的应用

The Application of Vacuum Phase-change Furnace in Weijing Line

由于魏荆线所输原油为南阳油田高黏度、高凝点、高密度的"三高"原油,全年需要加温运行。自加热炉"油改气"以来,全线应用燃气(油气两用)加热炉,取得了较好的经济效益和社会效益,但还存在炉体结构不合理、容易引发低温腐蚀等问题。因此,管道公司魏荆线选择应用真空相变加热炉。真空相变加热炉采用锅炉和换热器一体化设计,改变以往直接加热方式,以水为热媒,利用真空相变原理,在真空室完成热量交换,提高传热效率,减小锅炉体积。自投用以来,设备运行稳定,维护成本和运行成本都有了明显降低,达到了预期效果。

Wei-Jing Line needs heating throughout the year to transport Nanyang crude oil with high viscosity, high pour point and high density. After the heating furnace was modified with gas replacing oil as fuel, the gas furnace （oil/gas dual fuel） was used along the whole line, achieving good economic and social benefits. However, there were also problems such as unreasonable furnace structure and low-temperature corrosion. In order to solve the problems, the vacuum phase-change furnace was used for the first time in Wei-Jing Line. Instead of previous direct heating method, the vacuum phase-change furnace was designed to integrate with boiler and heat exchanger, use water as heat medium and exchange heat in vacuum chamber on the principle of vacuum phase-change, which improved efficiency and reduced boiler volume. Since put into use, the vacuum phase-change furnace has been running well as expected, helping reduce the maintenance and operating cost significantly.