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采用实验的方法,在鼓泡流化床燃烧装置中研究了低浓度煤层气在床内的流动和燃烧特性,考察了床层温度、气体浓度、流化风速及床料颗粒特性等操作条件变化对甲烷转化率和燃烧产物的影响。研究表明:床层温度升高,甲烷转化率显著增加;增加流化风速及进气甲烷浓度,甲烷转化率减小;颗粒粒径增加,甲烷转化率增加;CO排放浓度随床层温度的升高先增加后降低,并在床层温度约850℃时达到其最大峰值,沿流化床轴向高度CO的排放浓度先增加后降低,呈钟型分布。
In the experiment, the flow and combustion characteristics of low concentration CBM in the bed were studied in a bubbling fluidized bed combustion system. The changes of operating conditions such as bed temperature, gas concentration, fluidized air velocity and granularity of bed material were investigated. Effects on methane conversion and combustion products. The results show that the bed temperature increases and the methane conversion rate increases significantly. The increase of the fluidization velocity and the concentration of methane in the inlet increases the conversion of methane; the particle size increases and the methane conversion increases; the CO emission concentration increases with the increase of the bed temperature When the bed temperature reaches about 850 ℃, the maximum peak value is reached. The concentration of CO along the axial height of the fluidized bed first increases and then decreases, showing a bell-shaped distribution.