300MW机组锅炉汽包寿命在线监测系统的研究

采用三维有限元理论，对300MW机组锅炉汽包在内压作用下的应力场进行了分析，所得到的理论应力集中系数比TDR301的推荐值大17.3％，并用热弹性理论计算准稳态下汽包的热应力。在此基础上对TRD301给出的疲劳寿命计算方法提出了改进建议，开发了一套300MW机组锅炉汽包寿命在线监测系统。该系统利用计算机、智能化数据采集和通信转换对锅炉汽包运行全过程实行温度、压力和寿命的管理。经在某电厂1021t/h锅炉上运行，效果良好。达到了对锅炉汽包寿命进行在线监测和指导锅炉运行的目的。

The Study of an On-line Monitoring System for the Service Life of the Steam-drum of a 300 MW Power Plant

By using a three-dimensional finite element theory a finite element analysis was conducted of the stress field of a 300 MW power plant boiler-drum under the action of an internal pressure. The theoretical stress concentration factor thus obtained is greater than the recommended value of TRD 301 by 17.3%. The thermal stress of the boiler drum under a quasi-steady state was calculated by using the theory of thermal elasticity. On this basis a proposal was put forward to improve the TRD301-based method for calculating fatigue life and an on-line monitoring system for the service life of a 300 MW plant boiler-drum developed. By utilizing a computerized and intelligent data acquisition system and communications data conversion the management of temperature, pressure and service life was implemented for the whole process of the boiler drum operation. The use of the monitoring system on a 1021 t/h boiler at a power station has attested to the effectiveness of the system, which has attained the aim of on-line monitoring of boiler drum life and of properly guiding the boiler operation.