摘要
锅炉汽包在变工况运行时往往产生严重的"虚假水位"现象。对汽包、下降管、水冷壁内汽水工质循环过程进行合理简化,依据物质及能量守恒定律,建立以微分方程形式描述的汽包水位动态模型。将锅炉实际运行数据引入模型,观察模型输出水位与实际水位变化:锅炉稳态时,仅考虑给水流量与蒸汽流量平衡,模型即能够反映汽包水位变化;锅炉运行状态发生剧烈变化时,模型只有引入锅炉热量信号和汽包压力信号修正后,才能够反映汽包水位变化。以实际数据验证了"虚假水位"主要是受锅炉燃烧状态及汽包压力变化影响的结论。
A severe phenomenon of false water level exists in boiler drum under varying operating conditions. The cycle process of steam-water in drum, downcomer and water wall were simplified reasonably, according to the law of mass conservation and the law of energy conservation, the differential equation model of drum water level dynamic was constructed. Through introducing the boiler real operating data into the model and observing the difference of water level change between the model output and the real one, it was found that this model can reflect the change of water level under static conditions merely considering the balance of feed water flow and steam flow. By comparison, this model can also reflect the change of water level under sharply varying operating conditions only when introducing boiler heat signal amending and drum-steam pressure amending. Therefore, it is proved by practical data that false water level is mainly attributable to boiler combustion state and the change of drum-steam pressure.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第32期1-5,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(50776030)~~
关键词
锅炉汽包
虚假水位
机制分析
动态模型
热量信号
boiler drum
false water level
mechanism analysis
dynamic model
heat signal
