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提出了一种新型高温空气煤粉多级点火燃烧器。在成功实现煤粉多级点火的基础上,对影响多级煤粉着火燃烧的各影响因素(一级煤粉浓度、热风温度、多级煤粉浓度、多级煤粉送粉风流量以及环形冷却风流量)进行了试验研究。结果表明,随着一级煤粉浓度的降低,燃烧器内总体温度水平下降,多级煤粉的剧烈燃烧区向燃烧器出口移动。当多级煤粉气流着火后,停止一级给粉,热风温度在一定范围内仍可维持多级煤粉的着火燃烧。多级点火燃烧器内部温度随多级煤粉浓度的升高呈现先上升后下降的趋势。多级煤粉送风量对多级煤粉燃烧的影响呈现出与多级煤粉浓度变化相似的趋势。少量的环形冷却风可以对多级煤粉的燃烧起到助燃以及防止结焦的作用。
A new type of high temperature air pulverized coal multi-stage ignition combustor is proposed. Based on the successful realization of pulverized coal multi-stage ignition, the influencing factors (primary pulverized coal concentration, hot blast temperature, multi-stage pulverized coal concentration, multi-stage pulverized coal feeding powder flow and annular Cooling air flow) conducted a pilot study. The results show that with the decrease of the primary coal concentration, the overall temperature in the burner decreases and the severe combustion zone of the multi-stage pulverized coal moves toward the burner exit. When the multi-stage pulverized coal flow after the fire, to stop a powder, hot air temperature within a certain range can still maintain multi-level pulverized coal fire. The internal temperature of multi-stage ignition burner showed the trend of first rising and then decreasing with the increase of multi-stage pulverized coal concentration. The effect of multi-stage pulverized coal supply on multi-stage pulverized coal combustion shows a trend similar to that of multi-stage pulverized coal. A small amount of annular cooling air can play a supporting role in combusting multi-stage pulverized coal and preventing coking.