高温空气燃烧技术改造均热炉方案研究

系统研究了高温空气燃烧技术改造均热炉的各种方案 .提出这种新型燃烧技术必须充分考虑系统布置、炉膛结构、炉内烟气流动及传热过程、工件加热工艺过程等因素 .通过大量的数值模拟试验 ,发现在各种改造方案的入炉热量与原均热炉相等的情况下 ,当空气、燃气温度分别被预热到 12 73K和 10 73K时 ,炉内的最高温度相对较低 ,而炉内平均温度相对较高 ;温度分布不均匀系数Rtu从 33.18降到了 18.0 0左右 .在空气预热温度相同情况下 ,燃气预热温度越高 ,NOx 排放量越大 .最后 ,提出了均热炉燃烧系统的改造方案 ,并进行了非稳态燃烧过程数值模拟研究 .

Study on Scheme Applying High Temperature Air Combustion Technology to Rebuild a Cell Pit Furnace

Numerical simulations about applying high temperature air combustion technology to rebuild a cell pit furnace were carried out.The results show that it would make the new combustion system,flue gas flow in furnace,heat transfer to coordinate with the furnace configuration and heating work piece technology.If the input heat quantity in several rebuilding schemes is equal to the original input heat quantity,the highest flame temperature in furnace is relatively low when the air is preheated at 1 273 K and the gas at 1 073 K,while the average flame temperature is relatively high.The uneven coefficient of temperature distribution R tu decreases from 33.18 to about 18.00.In addition,if the preheated air temperatures are equal to each other,the higher the preheated gas temperature is,the more NO x emission is.Therefore,the rebuilding scheme is put forward in this paper.At last numerical simulations of unsteady combustion process were carried out.