O_2/CO_2气氛下单相介质换热器的仿真模型研究

Research on simulation model of single-phase heat exchanger under O_2/CO_2 atmosphere

基于O2/CO2燃烧方式的烟气成分和换热特点,建立了O2/CO2气氛下单相介质换热器的动态数学模型,并开发了通用化的仿真算法模块。以某300 MW富氧煤粉燃烧锅炉概念设计中的过热系统为研究对象,进行了减温水、入口烟温扰动下的仿真试验,结果表明O2/CO2=30/70气氛下过热系统的动态特性与空气气氛的变化趋势一致,但汽温的变化过渡时间缩短,对各扰动的响应更加敏感,可为O2/CO2气氛下过热器的控制系统设计和机组运行提供参考。

Based on the gas composition and the heat transfer characteristics of O2/CO2 combustion technique,this paper established a dynamic mathematical model and developed an engineering modularized simulation model for single-phase heat exchanger under O2/CO2 atmosphere.The simulation tests for the overheat system of a conceptual design of 300 MW oxygen-rich pulverized coal burning boiler were made under the disturbance of spray water and entrance smoke temperature.Simulation results show that the changing trends of overheat system under O2/CO2=30/70 and air atmosphere are similar but the transition time of export steam temperature variation is cutting short and the response to each disturbance is more sensitive,which can provide reference for the control system design and units operation under O2/CO2 atmosphere.