The water bath of the submerged combustion vaporizer has a corrosive effect on the heating coil and poses a threat to safe operation. To study the corrosion process of heating coil,the corrosion failure of the heating coil is analyzed and the limit state equation is established on the basis of the stress-intensity interference theory and the evaluation standard of pipeline corrosion residual strength. Considering the uncertainties of parameters, Monte Carlo method is used to calculate the limit state equation and the sampling time is 10 6. The quantitative evaluation for reliability of heating coil clarifies the trend of coil reliability over time and operating pressure. The results show that the failure probability of heating coil increases when the service time and operating pressure increases. If the lower limit of reliability is 0.8, then the service life of heating coil life will be 14 a. This reliability analysis provides a scientific basis for mastering the overall operation and rationalizing the maintenance.%浸没燃烧式气化器(Submerged Combustion Vaporizer,SCV)的水浴对加热盘管具有腐蚀作用,威胁气化器的安全运行.为研究加热盘管的腐蚀过程,采用应力-强度干涉理论和管道腐蚀剩余强度评估标准,对加热盘管的腐蚀失效进行分析,建立加热盘管的极限状态方程.考虑初始腐蚀尺寸、工况载荷、机械强度、轴向及径向腐蚀增长速率等参数的不确定性,应用Monte Carlo方法对加热盘管的极限状态方程进行抽样计算,抽样次数为106.通过对加热盘管进行可靠性定量评价,明确加热盘管可靠度随时间和运行压力的变化趋势.研究结果表明:加热盘管失效概率随使用年限和运行压力的增加而增加,且增加的速度逐渐增快,若以0.8为可靠度下限,则加热盘管的使用寿命为14 a.这一可靠性分析为掌握气化器总体运行状况和合理安排维修提供了科学依据.
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