锅炉高温受热面管束寿命在线监测技术研究

On-line life monitoring technique for the high temperature heating surface tube bundles of utility boiler

针对大型电厂锅炉过热器和再热器等高温受热面工作条件恶劣、炉管失效直接影响锅炉安全经济运行的问题,分析高温受热面的损伤机理。根据经典的蠕变损伤L-M公式,建立了高温受热面寿命在线监测模型,通过在线监测炉管金属壁温和工作应力,实时计算受热面管束的寿命损耗。在此基础上,开发了高温受热面在线寿命监测和管理系统,并将该系统应用于300MW电厂锅炉,为电厂锅炉的安全运行和状态检修提供了有效手段。

The high temperature heating surface such as the superheater and reheater of the large-size utility boiler all experience a relatively severe working condition. The failure of the boiler tubes will directly impact the safe and economic operation of the boilers. An on-line life monitoring model of the high temperature heating surface was set up according to the well-known L-M formula of the creep damages. The tube wall metal temperature and working stress are on-line monitored, and with this model, the real time calculation of the life expenditure of the heating surface tuhe bundles has been realized. Based on the technique the on-line life monitoring and management system of high tem- perature heating surface was developed for the 300 MW utility boiler. An effective device was thus suggested for the implementation of the safe operation and the condition based maintenance of the utility boilers.