关键词: 石脑油罐, 渣油清理, 工艺处置, 安全控制

Abstract: The 20,000 m3 naphtha tank is not easy to be replaced. And the naphtha contains sulfur, resulting in safety problems such as self-combustion caused by ferrous sulfide in the tank. Aiming at the problems, the joint workshop of certain ethylene plant summarizes various professional opinions and improves the special program. Taking advantage of the characteristics that naphtha and water are insoluble, combined measures are taken involving implementing water and recycling materials first, then maintaining the working environment with nitrogen blanket under micro positive pressure and flushing with water. This helps to avoid the bottleneck problems of self-combustion of ferrous sulfide and thorough displacement of combustible hydrocarbon. Through solid process energy isolation and safety control measures, the identification plan and normal operation of naphtha tank are completed on schedule, reaching the three goals of residual material recovery, safe and controllable operation and environmental friendliness.

Key words: naphtha tank, residue cleaning, technical disposa, safety control