燃气热水锅炉炉内空气动力场稳定性分析  

Analysis of the Stability of the Aerodynamic Field Inside a Gas-fired Hot Water Boiler

作　　者：张立栋[1] 李伟伟[2] 李作兰 宋献 ZHANG Li-dong;LI Wei-wei;LI Zuo-lan;SONG Xian(College of Energy and Power Engineering, Northeast University of Electric Power,Jilin, China, Post Code： 132012;Huaneng Chaohu Power Generation Co. Ltd. ,Chaohu, China,Post Code： 238015;Northeast Electric Power Designing Institute Co. Ltd. , Changchun, China, Post Code ： 130021;China Zhongyuan International Engineering Co. Ltd. , Beijing, China, Post Code： 100089)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]华能巢湖发电有限责任公司,安徽巢湖238015 [3]东北电力设计院有限公司,吉林长春130021 [4]中国中元国际工程有限公司,北京100089

出　　处：《热能动力工程》2018年第4期63-68,共6页Journal of Engineering for Thermal Energy and Power

基　　金：吉林省科技发展计划(20140204049SF)~~

摘　　要：为研究燃气热水锅炉炉内动力场的稳定性,采用计算流体力学软件Fluent中的标准k-ε湍流模型分析15%、27%、48%和100%负荷4种工况下的炉内压力、速度和烟气流动特性。研究表明：燃气炉内烟气流动较为复杂,存在明显的流动不畅区域,涡流较多,烟气流动阻力较大,其中换热管区域压降比入约52%;负荷变化时,应尽量减少出口负压,不应高于-400 Pa;换热管入口截面烟气速度存在较大差异,V_（max）/V_（min）约为3～7,且随负荷增长而增大。To study the stability of the aerodynamic field inside a gas-fired hot water boiler, the standard κ-ε turbulent flow model in the CFD software Fluent was used to analyze the pressure, speed and flue gas flow characteristics in the boiler at 15% ,27% ,48% and 100% of the rated load,totaling four operat- ing conditions. It has been found that the flue gas flow in the boiler will be relatively complex, existing conspicuously poor flow zones, having relatively more vortexes and a relatively big flue gas flow resist- ance. Among them, the pressure drop ratio k in the heat exchange tube zones will be around 52%. When the load varies, more efforts should be made as possible to reduce the negative pressure at the outlet, not higher than -400 Pa. In addition, a relatively big difference will be present in the velocities of the flue gases in the cross section at the inlet of the heat exchange tubes, Vmax/Vmin being about 3 to 7 and will increase with an increase of the load.

关 键 词：燃气炉 数值模拟 稳定性 阻力变化 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]