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高浓度煤粉燃烧是一种新型的洁净煤燃烧技术,具有高效低污染排放特性。在一维火焰炉与固定床反应器实验台上,对不同煤种、粒径、炉温在不同煤粉浓度下燃料N的释放特性进行了实验研究。实验结果表明:煤种不同,燃料N的释放特性差异明显。挥发分越高,燃料N最大释放率对应的煤粉浓度越低;煤粉粒径越小,燃料N在不同煤粉浓度下的释放率越高;炉温越高,燃料N越容易释放,燃料N主要以挥发分N的形式释放出来。随着煤粉浓度的递增,NOx转化率与燃料燃尽率均呈单调递减趋势,高浓度煤粉燃烧有利于低NOx的排放,但煤粉浓度过高,对煤粉的燃尽不利。在高浓度煤粉燃烧过程中,煤粉与空气的充分混合及合理选取过量空气系数至关重要。
High concentration pulverized coal combustion is a new type of clean coal combustion technology, with high efficiency and low pollution emission characteristics. In the one-dimensional flamestage furnace and fixed bed reactor experiment bench, different coal species, particle size, furnace temperature at different pulverized coal concentration of fuel N release characteristics were studied. The experimental results show that: different coal, fuel N release characteristics significantly different. The higher the volatility, the lower the concentration of pulverized coal corresponding to the maximum release rate of fuel N. The smaller the pulverized coal particle size, the higher the release rate of fuel N at different pulverized coal concentrations. The higher the furnace temperature, the easier the release of fuel N, Fuel N is mainly released in the form of volatile matter N. With the increase of pulverized coal concentration, NOx conversion rate and fuel burnout rate all showed a monotonous decreasing trend. High concentration pulverized coal combustion was favorable for low NOx emission, but the pulverized coal concentration was too high, which was unfavorable to the burnout of pulverized coal. In the process of high-concentration pulverized coal combustion, it is very important to mix pulverized coal thoroughly with air and reasonably choose excess air coefficient.