摘要
应用改进的充分搅拌火焰空间传热综合模型,计算研究了全氧燃烧玻璃窑炉的热工特性.探讨了胸墙高度、火焰温度和窑墙热阻等对窑墙内表面及外表面温度、通过窑墙的散热量和火焰与窑墙辐射给玻璃液面净热量的影响.计算结果表明:在保持火焰和玻璃液面温度不变的条件下,随胸墙高度增大,通过窑墙的总散热量增大,但窑墙内、外表面温度和通过单位面积的散热量变化不明显,火焰与窑墙辐射给玻璃液面的净热量因窑墙与玻璃液面辐射传热角系数变小和火焰黑度的增大而增大,且增大幅度远大于总散热量的增大幅度;火焰温度对火焰与窑墙辐射给玻璃液面的净热量有重要影响,在1600℃左右时,火焰温度每升高10℃,净热量平均增大约10%;随窑墙热阻增大,通过窑墙的散热损失减少,火焰与窑墙辐射给玻璃液面的净热量增大,因而有利于窑炉节能,但窑墙内表面温度也相应升高.
Calculations of thermal performance parameters for oxy-fuel glass melting furnaces have been carried out by applying the modified well-stirred model of heat transfer in combustion space. The influ- ences of breast wall height, flame temperature,and furnace wall thermal resistance have been studied. The calculated results show that with increasing breast wall height the total heat loss through furnace wall increases obviously, but the heat loss of unit furnace wall surface and the inner and outer surface tempera tures of furnace wall change slightly. Under the condition of keeping the temperatures of flame and glass melt unchanged, the net heat transfer from flame to glass melt increases remarkably because of the decrease of view factor between the furnace wall and the glass melt and the increase of flame emissivity. The flame temperature has a substantial effect on thermal performance parameters. The net heat transfer in- creases by about 10% for 10 °C increase of flame temperature at the flame temperature of about 1 600 °C. The heat loss decreases and the net heat transfer increases with increasing thermal resistance, and this is favorable to the furnace efficiency. Correspondingly, the inner surface temperature of furnace wall increases obviously.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2010年第6期779-782,795,共5页
Journal of Building Materials
关键词
全氧燃烧
热工特性
玻璃窑炉
计算机计算
oxy-fuel combustion
thermal performance
glass furnace
computer calculation
