陶瓷窑炉中富氧燃烧的传热特性和节能效果分析

为研究富氧燃烧技术在陶瓷窑炉中的实际传热现象,以液化气为燃料在富氧燃烧试验台上进行富氧试验。研究不同富氧燃烧条件下,烟气的组成和辐射率、烟气热损失及燃料消耗量的变化,结合火焰空间系统零维传热数学模型,分析富氧燃烧对传热过程及节能效果的影响,探讨提高空间传热效率、降低能量损失的有效途径,为富氧技术在陶瓷窑炉中的实际利用提供可靠依据。研究结果表明:在富氧燃烧过程中,随着氧浓度的增加,烟气量的减少,烟气中的CO2和H2O体积浓度增大,烟气发射率增大,尤其是当氧浓度达到24%～30%时迅速增加,辐射换热能力增强;换热空间的传热能力明显增强,有利于热利用效率的提高;烟气所造成的热损失减少,热利用率得到提高;在维持一定窑炉温度时,燃烧消耗量下降,相对节能效果在氧浓度偏高的状态下较为明显。

Analysis of Heat Transfer Characteristic and Energy-saving Effect of Oxygen-enriched Combustion in Ceramic Kiln

Using LPG as fuel for oxygen-enriched combustion on test beach,to study actual heat transfer phenomenon of oxygen-enriched combustion technology in ceramic kiln.Discussed the composition,rediation rete,heat loss of the gas and the consumption change of the fuel at different oxygen-enriched combustion conditions.And combining with zero-dimensional mathematical model of heat transfer for space systems,analysised the effect of oxygen-enriched combustion on heat transfer process and the energy saving effect,disscussed effective ways to improve space heat transfer efficiency and reduce energy loss,and provided the basis for the practical use of oxygen-enriched combustion in ceramic kiln.The results showed that: gas reduced with the increasing of oxygen concentration in oxygen-enriched combustion process,the volum concentration of CO2 and H2O raised,gas emission rate increased and accelerated especially when oxygen concentration reached 24% ~ 30%,radiation heat transfer ability strengthened;heat transfer capability of the heat space obvious enhanced,which conducive to improve the thermal utilization thermal efficiency;heat loss caused by smoke reduced;fuel consumption declined in maintaining the kiln in a certain temperature;the relative energy saving effect is obvious in the state of high oxygen concentration.