煤在不同O2/CO2气氛下燃烧硫析出特性研究

研究了煤在不同氧体积分数、混有CO2气氛下燃烧硫析出特性，结果表明，煤在低氧、混有CO2气氛下燃烧，SO2和H2S析出速率曲线均呈现双峰结构，H2S析出率明显增大，硫析出时间延长；在高氧气氛下，SO2和H2S析出速率曲线均呈现单峰结构，硫析出时间缩短。煤在低氧体积分数、混有CO2气氛下燃烧能够改善煤灰自固硫能力，降低硫的最终析出率；煤在高氧体积分数、混有少量CO2气氛下燃烧与空气气氛下燃烧相比，硫的最终析出率无明显变化。

The characteristics of sulfur release during coal combustion in the mixed-CO2 gas with different oxygen concentrations

The characteristics of sulfur release during HT-coal combustion in the mixed-CO_2 gas with different concentrations of oxygen were studied. The results show that during combustion in low oxygen concentration flow the rate curves of H_2S and SO_2 present two clear peaks, the quantity of released H_2S increases and the whole time of sulfur release is prolonged. On the contrary, during combustion in high oxygen concentration flow the rate curves of H_2S and SO_2 show single peak, the time of sulfur release shortens. Because of improvement of self-capturing sulfur ability of the ash, the quantity of sulfur release is reduced during combustion in the mixed-CO_2 gas with low oxygen concentration. The quantity of sulfur release from coal burned in high oxygen concentration flow is close to that burned in the air flow.