Coke tower is one of the important equipment in the coking unit.As a key safety barrier,safety valve at the overhead can release the pressure in time when the system pressure rises abnormally and prevent the equipment from overpressure.Once corrosion leakage occurs in the inlet pipeline connected with the safety valve,it is easy to cause accidents and threaten the safety production of enterprises.Based on a typical case of leakage in the inlet pipeline of the safety valve at the overhead in a coking unit,a comprehensive analysis was conducted from the aspects of operating conditions,pipeline materials,corrosion types,de-tection data,and corrosion product analysis.It was determined that dew point corrosion,H2S+HCl+H2O corrosion,and under-deposit corrosion of ammonium salt were the main causes of pipeline leakage;Measures such as material upgrading,strengthening of operating environment management,and regular inspection and testing were proposed to avoid the occurrence of leakage,there-by ensuring the safe and stable operation of the coking unit.
关键词
焦炭塔/安全阀入口管线/腐蚀减薄/露点腐蚀/H2S+HCl+H2O腐蚀
Key words
coke tower/inlet line of safety valve/corrosion thinning/dew point corrosion/H2 S+HCl+H2O corrosion
维普
万方数据