锅炉二次风系统数值模拟计算研究  

Calculation study on numerical simulation for secondary air system of boiler

作　　者：郑海明[1] 杨婧君 郭铁桥[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《中国科技论文》2017年第11期1257-1261,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(11174078);河北省自然科学基金资助项目(E2012502046);国家重点研发计划项目(2016YFB0600701)

摘　　要：为了研究锅炉二次风系统内部流场的分布特性,采用ANSYA CFX数值模拟计算软件对平顶山平东热电厂某机组四角切圆燃烧锅炉的二次风系统进行计算分析,对二次风系统建立模型,进行网格划分,并在给定边界条件下进行不同工况下的数值模拟,同时提出结构优化的方法,合理分配二次风道内的风量,以提高锅炉的燃烧效率。结果表明:将总风管过渡到二次风箱的90°角换成45°角后,二次风道内的流量分配出现了沿程增大的现象,合理地分配了二次风道内的风量。To study the flow characteristics of second air inside the system,based on the ANSYA CFX software for numerical simulation and analysis,this research is meant to carry out a computational analysis of the second air system of some tangential firing boiler unit of the Ping dong thermal power plant in Pingdingshan.Meanwhile,through modeling and meshing the second air system,and then conducting various numerical simulation under different operating conditions with a given boundary condition,the distribution characteristic of flow field within the second air system is revealed.Moreover,a structural optimization approach has also been put forward to improve the boiler＇s combustion efficiency by allocating the amount of second air within the air duct to ensure the complete combustion of the pulverized coal in the combustion process.The results show that the flow distribution in the secondary air duct increases along the flowing direction,which is a more reasonable way to allocate the second air flow in the duct,after the transition right angle between the total air duct and the second bellows has been changed to 45°angle.

关 键 词：二次风系统 流动特性 数值模拟 结构优化 

分 类 号：TM621.2[电气工程—电力系统及自动化]