煤在不同O2/CO2气氛下燃烧硫析出特性研究
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摘要: 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。Abstract: The characteristics of sulfur release during HT-coal combustion in the mixed-CO2 gas with different concentrations of oxygen were studied. The results show that during combustion in low oxygen concentration flow the rate curves of H2S and SO2 present two clear peaks, the quantity of released H2S increases and the whole time of sulfur release is prolonged. On the contrary, during combustion in high oxygen concentration flow the rate curves of H2S and SO2 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-CO2 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.
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Key words:
- coal /
- sulfur /
- combustion /
- sulfur release
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