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Examination of Emission Spectra from Hydrogen Sulfide Flames

机译：硫化氢火焰的发射光谱检查

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Spectroscopic examination of the emission spectra of excited species in hydrogen/air flames both without and with H_2S addition and in hydrogen sulfide/oxygen flame are conducted. The baseline case of hydrogen/air flame showed one distinct global peak of OH~* at 309.13nm. However, higher resolution spectrum analysis showed the presence of three major OH~* peaks at 306.13, 309.09, and 312.9nm. The addition of hydrogen sulfide to hydrogen/air flame resulted in the presence of a bluish cone located at inner regions of the flame. The spectrum of the blue cone showed group of peaks in the 350-470nm spectral range. The addition of H_2S drastically reduced the peak value of OH~* due to extensive consumption of the hydroxyl group during H_2S combustion. The group of peaks in the blue cone spectrum can be divided into three major bands. The first band is formed by SO~* within 320-350nm, the second band is attributed to SO_3~* within 350-400nm, and the third band is caused by H~* within 400-470nm. However, the distinction of SO_3~* band and H~* band around 400nm is an issue that requires further examination. Absorption bands of SH were observed at 324.03nm and 328.62nm. The effect of sulfur dioxide on the spectrum was observed by neither emission bands nor absorption bands because of its reaction with elemental oxygen to produce excited sulfur trioxide. Gas chromatography analysis showed that combustion products did not contain any SO_2. The spectra of H_2S/O_2 flame have also been examined under lean conditions (at Φ=0.5). In contrast to H_2/air/H_2S flames, the spectra of H_2S/O_2 showed strong absorption bands of SO_2 within 280-310nm. Strong continuum was observed between 280-460nm with distinct group of peaks superimposed in the spectra. The continuum is attributed to the afterglow of singlet and triplet SO_2. The superimposed peaks are attributed to SO_3~* and H~*.
机译：进行了光谱分析，考察了在不添加和添加H_2S的情况下在氢气/空气火焰中以及在硫化氢/氧气火焰中的激发物种的发射光谱。氢/空气火焰的基线情况在309.13nm处显示一个明显的OH〜*全局峰。但是，更高分辨率的光谱分析显示在306.13、309.09和312.9nm处存在三个主要的OH〜*峰。向氢气/空气火焰中添加硫化氢会导致位于火焰内部区域的蓝锥的出现。蓝锥的光谱显示了在350-470nm光谱范围内的一组峰。由于在H_2S燃烧过程中羟基的大量消耗，H_2S的添加大大降低了OH〜*的峰值。蓝锥光谱中的峰组可以分为三个主要谱带。第一频带由320-350nm内的SO〜*形成，第二频带归因于350-400nm内的SO_3〜*，而第三频带由400〜470nm内的H〜*引起。然而，在400nm附近区分SO_3〜*带和H〜*带是一个需要进一步研究的问题。 SH的吸收带在324.03nm和328.62nm处观察到。由于二氧化硫与元素氧反应生成激发的三氧化硫，因此既没有发射带也没有吸收带观察到二氧化硫对光谱的影响。气相色谱分析表明燃烧产物不含任何SO_2。 H_2S / O_2火焰的光谱也已在稀薄条件下（Φ= 0.5）进行了检查。与H_2 /空气/ H_2S火焰相反，H_2S / O_2的光谱在280-310nm范围内显示出较强的SO_2吸收带。在280-460nm之间观察到强连续体，在光谱中叠加了不同的峰组。连续体归因于单重态和三重态SO_2的余辉。叠加的峰归因于SO_3〜*和H〜*。

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