梭式窑富氧燃烧的数值模拟研究

Numerical Simulation on Oxygen Enriched Combustion in Shuttle Kiln

采用Fluent软件对日用陶瓷梭式窑的富氧燃烧技术改造进行数值模拟计算。研究不同富氧浓度对于梭式窑温度场及制品温度带来的影响及规律。结果表明,随着氧气浓度的增加,梭式窑内火焰最高温度逐渐增加,窑内温度的均匀性变好,但在不改变喷枪口径的情况下,窑内陶瓷制品的温度变化不显著。为了提高陶瓷制品的烧成温度,应对窑内喷枪进行改造,减小喷枪口径,增大燃气与富氧喷入速度可提高对流换热作用,进而提高陶瓷制品温度。增加棚板层的层间高度可使更多的热气流从陶瓷制品上方进入到制品区域内部进行对流换热,减小陶瓷制品区域温差。

Numerical simulation wasperformed for technical renovation of oxygen enriched combustion of ceramic shuttle kiln with the Fluent software. The influences and rules of temperature field distribution of shuttle kiln and ceramic： product were researched with different oxygen concentrations. The experimental results show that with the increase of the oxygen concentrations, maximum flame temperature increases gradually in shuttle kiln. Temperature uniformity change is better in shuttle kiln. However, without changing the gun diameter, temperature changing of ceramics kiln was not significant. In order to increase the firing temperature of the ceramic products, the caliber of spray gun should to be changed. Reducing the caliber of spray gun, and increasing the injection speed of fuel gas and oxygen enriched air can en- hance convective heat transfer, so that temperature of ceramic product can be improved. Increasing the interlayer height of refractory slab can make more hot air into interior product area from the top of the ceramic products, thus to conduct convective heat exchange and reduce the temperature difference among ceramic products.