锅炉高温受热面蒸汽侧氧化膜在线监测技术研究

建立了高温受热面炉内壁温在线监测模型、氧化膜生长模型、氧化膜应力在线监测计算模型和氧化膜脱落评估模型等.在此基础上,开发了锅炉高温受热面蒸汽侧氧化膜管理系统,并利用该系统对某600MW超临界锅炉高温受热面炉内管壁温度和蒸汽侧氧化膜厚度及应力状态进行实时计算与分析.结果表明:利用该系统可以减小沿烟道宽度方向的热偏差,有效降低偏差屏的炉内温度,减缓管内氧化膜生成速率;通过对温度变化速率、氧化膜应力状态的实时监测,可以积极预防氧化膜的脱落和堆积.

On-line Monitoring of Steam-side Oxide Scale in High-temperature Heat-surface Tubes of Boiler

A number of models were built up respectively for on-line monitoring of tube wall temperatures at high-temperature heating surfaces, oxide scale growth, on-line calculation of scale stress and for exfoli- ation evaluation of the oxide scales. Based on these models, a management system for steam side oxide scale on high-temperature heating surfaces of boiler was developed and applied to a 600 MW supercritical power boiler. Results show that with the oxide scale management system, thermal deviation can be re- duced along flue duct width direction, which will result in reduced in-furnace tube wall temperature of de viated panels, and lowered growth rate of oxide scales; deposition and exfoliation of oxide scales can also be prevented by on-line monitoring of corresponding temperatures and scale stress.