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对40kW同轴射流富氧煤粉燃烧试验系统进行数值模拟,研究了在总体O2体积分数和氧化剂过量系数一定的条件下,不同一次氧化剂O2体积分数对同轴射流富氧燃烧煤粉着火距离的影响,分析了低一次氧化剂O2体积分数下富氧燃烧煤粉着火及火焰稳定性.结果表明:在总体O2体积分数为40%和氧化剂过量系数为1.15的条件下,当一次氧化剂O2体积分数为20.9%时,着火距离较小,为附着火焰;当一次氧化剂O2体积分数减小至14.6%、10.0%和5.5%时,着火距离明显增大,着火延迟,为分离火焰;适当提高二次氧化剂预热温度有利于低一次氧化剂O2体积分数下富氧燃烧的煤粉着火及火焰稳定.
In this paper, the numerical simulation of 40kW coaxial jet oxygen-enriched pulverized coal combustion test system was carried out. The effect of different primary oxidant O2 volume fractions on ignition distance of coke jet oxy-fuel combustion pulverized coal was studied under the condition of the total O2 volume fraction and the oxidant excess coefficient. The results showed that under the condition of total volume fraction of O2 and oxidant excess coefficient being 1.15, when the volume fraction of O2 in the primary oxidant was 20.9%, the ignition distance is small, with a flame attached; when the volume fraction of oxidant O2 is reduced to 14.6%, 10.0% and 5.5%, the ignition distance is obviously increased, the ignition is delayed, and the flame is separated; the secondary oxidant The preheating temperature is beneficial to the ignition of coal and the flame stabilization of oxygen-enriched combustion under the low O2 content of the oxidant.