中文摘要：

在沉降炉上采用烟气分析仪测量不同炉温条件下煤粉着火燃烧后烟气中O_2和NO浓度变化历程,提出了一种定量确定煤粉颗粒着火状态的方法,并测量了不同氧浓度O_2/CO_2气氛下煤粉颗粒着火温度。结果表明,21%O_2/79%CO_2气氛下不同煤种煤粉着火温度比空气（21%O_2/79%N_2）气氛下高62～130℃。随着氧浓度的增加,O_2/CO_2气氛下煤粉着火温度显著降低,而且对于不同煤种O2/CO_2气氛下氧浓度提高至26%～44%可得到与空气气氛相匹配的煤粉着火温度。

英文摘要：

The ignition behavior of pulverized coal particles was determined by the measurement of O2 and NO concentration evolution through the flue gas analyzer at different wall temperatures of drop tube furnace, and the ignition temperatures of pulverized coal particles at different O2/CO2 environments and air environment were measured as the minimum gas temperatures at the critical ignition condition. The results show that the ignition temperature of pulverized coal particles at 21%O2/79%CO2 environment is higher from 62℃to 130℃ than that at air （21%O2/79%N2） environment for different coal ranks. Moreover, the coal ignition temperatures in O2/CO2 environ- ment decrease with the increasing oxygen concentrations. The oxygen concentration in O2/CO2 environment should be improved to the range of 26% to 44% in order to match the coal ignition temperature in O2/CO2 environment to that in air environment.