换热器的风险检测技术研究

在API581的基础上,针对换热器的特点,对RBI的方法进行补充和改进。首先,从换热器的失效模式入手,明确换热器各零部件的失效原因及故障影响;其次,根据换热器的特殊工况和结构,补充针对换热器的损伤模块,如换热器管束的振动、内外壁损伤以及传热效率等对换热器的使用影响。然后,结合我国承压设备的特殊使用状况,用剩余寿命代替设计寿命作为计算失效概率的基准。最后,利用以上方法结合API581技术,对上海石化加氢裂化装置的26台换热器进行计算,确定其风险值,与DNVORBIT软件计算结果对比,验证了该方法的合理性和可行性。

Application of Risk-based Inspection on the Heat Exchanger

According to the complexity of the structure and working condition,the RBI was improved.From failure mode of heat exchanger,the failure and fault effects of all the parts of heat exchanger were cleared.According to the special conditions and structure of heat exchanger,and the damage modules of heat exchanger were discussed,such as heat transfer bundle of vibration,heat transfer efficiency inside and outside wall damage,and influence on the heat exchanger usage.Combined with the special usage of pressure equipment in our country,and with API581 technology,hydrocracking unit in Shanghai Petrochemical,26 heat exchangers were calculated to determine the risk value.Compared with the result of DNV ORBIT software,the rationality and feasibility of this method were validated.