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本文将一种褐煤和一种烟煤进行不同混合比例(9:1、7:3、1:1、3:7和1:9)和不同燃烧气氛(O_2/N_2和O_2/CO_2气氛)的沉降炉燃烧实验,采用低压撞击器(LPI)对燃烧生成的颗粒物进行收集,并对所收集的颗粒物开展生成浓度、元素组成等分析,研究了混煤燃烧减少细微颗粒物生成的作用机理及混煤比例、燃烧气氛对其的影响。研究结果表明,两种实验煤粉混合燃烧后,PM_1的生成相比于理论计算值有不同程度的减少,说明不同煤种间矿物元素的交互作用抑制了燃煤过程中PM_1的生成。煤粉混合比例和燃烧气氛对PM_1生成的抑制程度有重要影响。在本实验研究中,当褐煤与烟煤的混合质量比为7:3时,PM_1的生成所受抑制程度最大;与O_2/N_2燃烧气氛相比,O_2/CO_2燃烧气氛下,混煤燃烧后矿物元素交互作用减弱,PM_1生成所受抑制程度降低。与理论计算值相比,混煤后PM_1中的Ca、Fe元素生成浓度减少,而PM_(10+)中Ca、Fe、Si、Al元素生成浓度则增多,褐煤燃烧过程中生成的Ca、Fe等易气化元素与烟煤中大量硅铝酸盐的交互作用是混煤燃烧后PM_1生成减少的主要途径。
In this paper, a kind of lignite and a bituminous coal were used for sedimentation under different mixing ratios (9: 1, 7: 3, 1: 1, 3: 7 and 1: 9) and different combustion atmospheres (O 2 / N 2 and O 2 / CO 2 atmospheres) In the combustion experiment of the furnace, LPI was used to collect the particulates generated by the combustion. The concentration and elemental composition of the collected particulates were analyzed. The mechanism of the combustion of the blended coal to reduce the formation of fine particulates and the proportion of the mixed coal , The impact of the burning atmosphere on it. The results show that after the two kinds of pulverized coal are mixed and burned, the generation of PM_1 is reduced to some extent compared with the theoretical calculation, indicating that the interaction of different coal elements inhibits the formation of PM_1 during coal combustion. The mixing ratio of pulverized coal and the combustion atmosphere have an important influence on the degree of PM_1 generation inhibition. In this experimental study, when the mass ratio of lignite and bituminous coal is 7: 3, the generation of PM 1 is the most inhibited. Compared with O 2 / N 2 combustion atmosphere, under the combustion of O 2 / CO 2, The interaction of elements weakened and PM_1 production was inhibited to a lesser extent. Compared with the theoretical value, the concentration of Ca and Fe in PM_1 decreased, but the concentration of Ca, Fe, Si and Al in PM_ (10+) increased. The Ca, Fe The interaction of easily-gasified elements with a large amount of aluminosilicate in bituminous coal is the main way to reduce the generation of PM 1 after the coal is combusted.