富氧锅炉再热器动态特性的数值模拟研究  

Numerical Simulation of Dynamic Characteristic of Pressurized Oxy-fuel Boiler Reheater

作　　者：高正阳[1] 赵航[1] 吉硕[1] 杨鹏飞[1] 孟欣欣[1] 吕少昆 

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《电站系统工程》2015年第1期5-7,11,共4页Power System Engineering

摘　　要：基于增压富氧燃烧锅炉对流受热面的动态特性缺乏理论研究,以一台300 MW燃煤锅炉的再热系统为研究对象,分别在空气气氛下以及O2/CO2=30/70气氛不同压力富氧条件(0.1MPa、1MPa)下,利用Fluent软件进行了蒸汽入口温度、烟气入口温度、蒸汽入口流量及烟气入口速度扰动的数值模拟实验。结果表明:空气气氛、常压富氧及增压富氧气氛下入口蒸汽温度扰动时,再热蒸汽出口的温度变化幅度依次减小;入口蒸汽量、烟气温度和烟气速度扰动时,再热蒸汽出口的温度变化幅度依次增大,相应的动态响应时间都依次减少;与Matlab实验结果相比,数值模拟模型更加准确地反映对流受热面工质流动及换热情况,模拟结果具有更高的精度和通用性。Due to the lack of theoretical studies based on dynamic characteristics of pressurized oxy-fuel boiler convective heating surface, a 300MW coal-fired boiler for reheat system is studied. In the air and O2/CO2=30/70 atmosphere of different pressured oxygen-rich conditions （0.1MPa, 1MPa）, the experiments about perturbations of the steam inlet temperature, flue gas inlet temperature, the steam inlet flow and flue gas inlet velocity was numerically simulated with Fluent software. The calculation results showed that when disturbing inlet steam temperature in the air and oxygen-rich and pressurized oxygen-rich atmosphere, the magnitude of the change of reheat steam outlet temperature reduces successively; As for the perturbation of the steam inlet flow and flue gas inlet temperature and flue gas inlet velocity, the magnitude of the change of steam outlet temperature increases sequentially, the corresponding dynamic response time reduces sequentially. Compared with experimental results with Matlab software, numerical simulation model reflects more accurately the heat transfer and flow case of the working fluid and the convective heating surface, the simulation results have higher accuracy and versatility.

关 键 词：增压富氧 数值模拟 对流受热面 动态特性 

分 类 号：K263.1[历史地理—历史学]