摘要
为研究高发射率涂料在高炉热风炉蓄热室内的应用效果,应用数学模拟和工业试验对比的研究方法对节能效果进行了分析.结果表明:模拟结果接近工业应用数据,可以定量地说明涂料对热风炉传热过程的积极作用;应用高发射率涂料后,可使高炉热风炉热风温度升高25℃,烟气温度降低13℃.结合数学模拟和工业热诊断结果,对涂料在热风炉内使用的节能机理进行了分析.认为在格子砖表面涂覆高发射率涂料,在燃烧期会使蓄热体内烟气与格子砖辐射换热加强,格子砖表面温度增加,且使蓄热体蓄热量增加.模拟结果表明:烟气中CO2成分对提高辐射传热起重要作用;CO2体积分数平均每提高5%,则热风温度提高6~8℃.
The energy-saving effect of high emissivity coatings for BF hot-blast stoves was studied and analyzed by comparing numerical simulations with industrial applications. It is showed that the simulation data agree with the industrial application results,proving a positive effect of the coating on energy transfer in a hot blast stove. The simulation results indicate that with the coating applied,the hot blast temperature can increase by 25 ℃ and the flue gas temperature decreases by 13 ℃. The energy-saving mechanism of the high emissivity coating in a hot blast stove was discussed based on the simulation results and thermal balance analysis. It is thought that the coating intensifies radiative heat transfer between gas and checker-brick surfaces during the combustion period,and further increases the energy storage capability and the surface temperature of checker bricks. In addition,the simulations show that CO2 in the gas plays an important role in intensifying radiative heat transfer,and generally increasing 5% CO2 in flue gas will make the temperature of hot air increase by 6 to 8 ℃.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第7期915-921,共7页
Journal of University of Science and Technology Beijing
基金
科技型中小企业技术创新基金资助项目(No.06C26213701371)
山东省自然科学基金资助项目(No.Y2006F26)
关键词
高炉
高发射率涂料
节能
数学模拟
机理
blast furnace (BF)
high emissivity coating
energy saving
numerical simulation
mechanism