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在实验室沉降炉中进行煤粉热解制焦、煤焦燃烧及煤粉燃烧实验,研究了煤焦燃烧过程对颗粒物生成的影响。研究发现,煤焦燃烧生成的PM_1和PM_(10)浓度均低于煤粉燃烧时,说明热解制焦过程对PM_1和PM_(10)生成的影响很大;随着温度由1073K升至1573K,煤焦燃烧生成PM_1浓度与煤粉燃烧生成PM_1浓度之比减小,而PM_(1-10)之比增加,表明随燃烧温度升高,矿物元素气化、细小矿物直接转化机理受抑制增大,破碎、聚合机理受抑制较小;相比原煤,中密度煤的煤焦与煤粉燃烧生成PM_1之比更小,而PM_(1-10)之比更大,其浓度比的差别主要来自于煤粉燃烧生成的PM_(10)浓度的差异。
Pulverized coal pyrolysis in the laboratory settling furnace coke, coal combustion and pulverized coal combustion experiments to study the coal combustion process on the formation of particulate matter. The results show that the concentrations of PM_1 and PM_ (10) generated by the combustion of coal char are lower than those of pulverized coal combustion, indicating that the pyrolysis process has a great effect on the formation of PM_1 and PM_ (10). With the increase of temperature from 1073K to 1573K , The ratio of PM_1 combustion combustion to PM_1 concentration reduction decreases and PM_ (1-10) ratio increases, indicating that with the increase of combustion temperature, the mineral elements are gasified and the direct conversion mechanism of fine minerals is inhibited Large, broken, polymerization mechanism is less inhibited; Compared with the raw coal, coal combustion and pulverized coal combustion of medium-density coal to generate a smaller PM_1 ratio, while the ratio of PM_ (1-10) is greater, the concentration ratio of the main difference From the pulverized coal combustion PM_ (10) concentration difference.