摘要
依据燃料燃烧理论和窑内辐射传热原理,应用改进的火焰空间传热模型,从理论角度对空气助燃与全氧燃烧玻璃熔窑的热工特性进行了初步的对比计算分析。计算结果表明,对燃甲烷天然气玻璃熔窑,全氧燃烧产生的烟气量仅为空气助燃时的三分之一,而理论燃烧温度远高于空气助燃时的温度,在相同的火焰温度要求下,全氧燃烧可大大节约燃料,减少烟气带走的热量;全氧燃烧时,烟气中二氧化碳和水蒸汽的含量约为空气助燃时的3.5倍,由此而导致火焰黑度大幅提高,约为空气助燃时的2.3倍,火焰辐射给玻璃料液面的热量增加35%;火焰温度升高,火焰黑度略有下降,火焰辐射给玻璃料液面的热量增大;胸墙增高,气层有效厚度增大,火焰黑度增加,火焰辐射给玻璃料液面的热量也增大。
Based on the theories of fuel combustion and the principles of heat transfer in furnace, a comparative study on thermotechnical performance between airfuel and oxy -fuel glass melting furnaces has been carried out theoretically by applying the modified well stirred model of heat transfer in glass furnace. The calculated results show that the quantity of waste gas from oxy - fuel is only about one third of that from air - fuel and the theoretical combustion temperature by oxy - fuel is much higher than that by air - fuel. The concentrations of carbon dioxide and water vapor in waste gas from oxy - fuel are about 3.5 times as high as those from air - fuel. Thus it results that the flame emissivity of oxy - fuel is 2.3 times as high as that of air - fuel and a 35 percent increase of the net radiative heat transfers from flame to glass melt. With increasing flame temperature, the emissivity of flame decreases slightly and the net radiative heat transfer from flame to glass melt increases obviously. A higher breast wall will enhance the radiation beam thickness, and thus lead to an increase of net radiative heat transfer from flame to glass melt due to the increase of flame emissivity.
出处
《玻璃与搪瓷》
CAS
2009年第6期1-5,15,共6页
Glass & Enamel
关键词
玻璃熔窑
全氧燃烧
热工性能
辐射传热
计算机计算
oxy - fuel combustion
thermal performance
radiation heat transfer
glass furnace
computer calculation
