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结合旋风气化炉高径比较大的结构特征,合理选择气化介质配风方式,优化炉内温度分布,以期提高稻壳气化的燃气品质,改善由气固分离引起的碳转化率较低的问题。基于空气分级的思想,针对空气二次分级和三次分级对稻壳旋风气化特性的影响规律进行试验研究。结果表明:二次风的位置设置在外旋风筒下部较为合适,空气当量比以0.23~0.26为宜,气化炉温度均布于800~900℃,有利于焦炭与水蒸气的气化反应。二次风率为30%时,相对不分级情况稻壳气化的碳转化率增大11.2%,气化燃气的低位热值增大18.4%。稻壳旋风气化系统的碳转化率最大值为55.5%,空气三次分级对改善系统的碳转化率效果并不明显,改变配风方式对稻壳旋风气化的燃气产率无影响。
Combining with the larger structure characteristics of the cyclone gasifier, the gas distribution mode of the gasification medium is reasonably selected and the temperature distribution in the furnace is optimized so as to improve the gas quality of the gasification of the rice husk and to improve the carbon conversion rate caused by gas-solid separation The problem. Based on the idea of air classification, the effects of air secondary classification and tertiary classification on the cyclone gasification characteristics of rice husks were studied. The results show that the location of the secondary air is more suitable for the lower part of the outer cyclone, the air equivalence ratio is 0.23 ~ 0.26, and the temperature of the gasifier is 800 ~ 900 ℃, which is favorable for the gasification reaction between coke and water vapor. When the secondary wind rate was 30%, the carbon conversion rate of rice husk increased 11.2% and the low calorific value of gasified gas increased 18.4%. The maximum carbon conversion rate of rice husk cyclone gasification system is 55.5%. The effect of tertiary air classification on improving the system carbon conversion rate is not obvious. Changing the gas distribution mode has no effect on the gas yield of cyclone gasification of rice husks.