摘要
通过汽包的应力和寿命损耗计算模型,研究了汽包的结构、材料和升温率对冷态启动过程和高负荷调峰过程中汽包寿命损耗的影响,并将其结果进行可视化图形处理。结果表明:采用小直径的厚壁汽包能够显著减小冷态启动过程和调峰过程中的汽包寿命损耗;采用大热扩散率和小线膨胀系数的材料有利于减小冷态启动过程中的汽包寿命损耗;采用低升温率进行冷态启动可以明显减小汽包寿命损耗,但会明显增加燃料成本,因此需要以冷态启动过程总成本最低为优化目标,选择最优升温率。
Based on calculation models for boiler stress and life loss,the effects of following factors on the life loss of a boiler drum were studied in the processes of cold startup and peak load regulation,such as the drum structure,material properties and heating rate,etc.,while corresponding study results were vasualized. Results show that the use of a small diameter thick wall drum could significantly reduce the life loss of boiler drum during cold startup and peaking period,and the material with high thermal diffusivity and low expansion coefficient could also help to reduce the life loss during cold startup process.Although adopting low heating rate could obviously reduce the life loss of boiler drum in cold startup process,the cost of fuel would be apparently increased,so it is necessary to minimize the total cost and select an optimal heating rate for the cold startup process.
作者
李军
张扬
LI Jun;ZHANG Yang(Material Engineering Invention Examination Department of the Patent Office,State Intellectual Property Office of China,Beijing 100088,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2018年第12期965-971,共7页
Journal of Chinese Society of Power Engineering
关键词
汽包
应力
低周疲劳
寿命
材料
结构
升温率
drum
stress
low-cycle fatigue
life
material
structure
heating rate
