基于化学动力学探究煤气成分变化对陶瓷烧成的影响

Influence of Gas Composition Change on Ceramic Sintering Based on Chemical Kinetics

以燃料燃烧机理作为研究工具,通过点火延迟时间与组分预测两方面验证了简化机理的合理性,从燃烧温度、燃烧产物及火焰长度三个角度分析了煤气的主燃成分占比变更对陶瓷烧成产生的影响。结果表明:两种煤气的燃烧结果具有明显的差异,在相同工况下清洁燃气的最高燃烧温度相比自制煤气提高了50℃以上,更加节能并利于陶瓷烧成;清洁燃气的燃烧产物中CO_(2)比值更低,但H_(2)O的比值提升了近70%,整体上降低了排放与增强了辐射换热并进一步降低了能耗;清洁燃气的火焰锋面长度短0.01 m,在建陶窑炉上使用该特性燃烧器应搭配合理碳化硅套筒诱导高温烟气以达到具体使用要求。

With the fuel combustion mechanism as the research tool,the rationality of the simplified mechanism was verified through ignition delay time and component prediction.The influence of the change of the proportion of the main combustion component of the gas on the ceramic sintering was analyzed from the perspectives of combustion temperature,combustion products and flame length.The results show that the combustion results of the two kinds of gas have obvious differences.Under the same working conditions,the maximum combustion temperature of clean gas is higher than that of self-making gas by more than 50℃,which is more energy-saving and conducive to ceramic sintering.The ratio of CO_(2) in the combustion product of clean gas is lower,but the ratio of H_(2)O is increased by nearly 70%,which reduces emissions,enhances radiation heat transfer and further reduces energy consumption.The flame front length of clean gas is shorter by 0.01 m,and this gap in the measured results is amplified,which is combined with the reasonable length of silicon carbide sleeve in wide kilns under the same conditions.