循环流化床富氧气化实验研究

在循环流化床富氧气化实验台上,通过调节水蒸气流量使气化温度基本稳定在910℃,研究了不同氧气浓度及气化当量比对煤气组分、产气率、冷煤气效率及碳转化率的影响。结果表明,氧气浓度从25%增加至40%时,N2体积分数从48.82%降低至33.83%,H2从21.47%不断增加至27.59%,CH4基本不变;受水蒸气流量影响,氧气浓度高于35%时,CO体积分数降低,CO2体积分数增加;氧气浓度40%时的煤气热值为空气气化煤气热值的1.84倍,产气率随氧气浓度增加从2.35 m3/kg降至2.13 m3/kg,冷煤气效率和碳转化率不断增大;当气化当量比从0.20增加至0.29时,N2体积分数先降低后升高,H2体积分数从24.01%增加到25.46%后基本保持不变,CO和CH4持续减小,CO2不断增加,产气率由1.94 m3/kg升高到2.29 m3/kg;受水蒸气和气化当量比综合影响,冷煤气效率先增大后减小,碳转化率持续增加。

Experimental study of oxygen-enriched gasification in circulating fluidized bed

On the test rig of oxygen-enriched gasification in circulating fluidized bed, the effects of oxygen concentration and equivalent ratio on gas components, gas production rate, cold gas efficiency and carbon conversion are investigated, when the gasification temperature is kept at 910 ℃ by adjusting steam flow. The results show that when oxygen concentration increases from 25% to 40%, N₂ reduces from 48.82% to 33.83%, H₂ increases from 21.47% to 27.59%, and CH₄ changes little. Due to the influence of steam flow, CO decreases and CO₂ increases when oxygen concentration is higher than 35%. Heat value of the gas with the oxygen concentration of 40% is 1.84 times of that with air gasification. Gas production rate decreases from 2.35 m³/kg to 2.13 m³/kg, and both of cold gas efficiency and carbon conversion increase with the increase in oxygen concentration. As equivalent ratio changes from 0.20 to 0.29, N₂ reduces and then increases, H₂ grows from 24.01% to 25.46% and then remains unchanged, CO and CH₄ keeps reducing, CO₂ keeps increasing, and gas production rate increases from 1.94 m³/kg to 2.29 m³/kg. Influenced by both stem flow and equivalent ratio, cold gas efficiency increases firstly and then decreases, and carbon conversion keeps increasing.