Experiments were carried out to find out the effect of different TFGR ratios on flame characteristics, pollutant emission, temperature, luminosity, IR radiation and total radiation of natural gas flames. A spiral duct connected tangentially to the furnace inlet linked the furnace to the chimney. A centrifugal fan was installed on the spiral duct to suck the combustion products and a spiral duct back-draft round damper was installed to adjust the FGR volume flow rate. The optical properties of the flame were studied for visible and IR wavelengths by a TES-1332 A digital luminance meter, a BOMEM FTIR and IR flame photography. Also, the total radiation of flame was determined by an SBG01 heat flux sensor. Furthermore, an S type thermocouple was used to measure the flame temperature. The results indicate that TFGR changes the nonluminous natural gas flame to a luminous flame by the dissociation of the recirculated CO₂ to CO. TFGR enhances the tangential momentum of flame and generates a voluminous flame, increases the heat transfer area of flame and eliminates the hot-spot region in the core of flame, which decrease the axial flame temperature and thermal corrosion. Furthermore, the concentration and residence time of CO₂ and H₂O, as the most important radiative species of natural gas flames, increase in the flame reaction zone, which results in the enhancement of the IR emissivity and the radiation heat transfer of natural gas flame. Finally, although the TFGR increases the concentration of CO emission to a level lower than the standard level, it causes natural gas burners to emit significantly less dangerous NOx.

通过实验研究了不同TFGR比对天然气火焰火焰特性、污染物排放、温度、光度、红外辐射和总辐射的影响。与熔炉入口相切连接的螺旋管道将熔炉与烟囱相连。在螺旋风道上安装离心风机吸入燃烧产物，并安装螺旋风道倒吸式圆形风门调节烟气流量。通过 TES-1332 A 数字亮度计、BOMEM FTIR 和红外火焰摄影研究了可见光和红外波长的火焰光学特性。此外，火焰的总辐射量由 SBG01 热通量传感器确定。此外，S型热电偶用于测量火焰温度。₂ to CO。TFGR增强了火焰的切向动量，产生了大量的火焰，增加了火焰的传热面积，消除了火焰核心的热点区域，降低了轴向火焰温度和热腐蚀。此外，CO ₂和H ₂ O作为天然气火焰最重要的辐射物种，在火焰反应区的浓度和停留时间增加，导致红外发射率和天然气辐射传热的增强。火焰。最后，尽管 TFGR 将 CO 排放浓度增加到低于标准水平的水平，但它使天然气燃烧器排放的 NOx 危险性显着降低。