混煤燃烧过程中的交互作用:煤种对混煤燃烧与NO_x排放特性的影响

发布时间：2018-05-04 22:15

本文选题：混煤掺烧 + 掺烧方式　；参考：《煤炭学报》2017年09期

【摘要】：在沉降炉上开展了无烟煤、贫煤、烟煤、褐煤以及不同配比(25%,50%,75%)下混煤燃烧特性实验,研究了"炉外"和"炉内"两种掺烧方式下煤种对混煤燃尽及NO_x排放特性的影响。结果表明,不同煤种掺混燃烧时促进和抑制两种交互作用具有差异性。"炉外"掺烧方式下,挥发分含量差异较大的煤掺混时,交互作用明显;尤其是掺烧75%高挥发分煤时,对燃尽抑制作用表现最为显著,混煤的燃尽降低;挥发分含量差异较小的煤掺混时,交互作用相对较小,混煤的燃尽率在各掺混比例下基本接近计算线性燃尽率;混煤燃烧的NO_x排放特性随挥发分较高的煤的掺混比例增加基本呈线性变化的规律。"炉内"掺烧方式下,随两种煤延迟混合时间的增加,交互作用逐渐减弱,各单煤的燃烧独立性增强,混煤燃尽率逐渐接近计算线性燃尽率;挥发分含量差异较大的煤掺混时,改变混合时间,混煤燃尽率变化显著,挥发分含量差异较小的煤掺混时,各单煤燃烧独立性较强,改变混合时间,混煤燃尽率变化不明显;混煤NO_x排放量随延迟混合时间的增加而逐渐降低。
[Abstract]:Experiments on combustion characteristics of anthracite, lean coal, bituminous coal, lignite and mixed coal with different ratio of 25% and 50% were carried out on the settling furnace. The effects of coal types on the burnout and NO_x emission characteristics of mixed coal under "outside furnace" and "inside furnace" were studied. The results show that there are differences in promoting and inhibiting the interaction between different coal types. " When mixed with coal with different volatile content, the interaction is obvious, especially when 75% high volatile coal is mixed, the inhibition of burnout is the most obvious, and the burnout of mixed coal is decreased. When the volatile content difference is small, the interaction is relatively small, and the burnout rate of mixed coal is close to the calculated linear burnout rate under each blending ratio. The NO_x emission characteristics of mixed coal combustion are linearly changed with the increase of blending ratio of coal with higher volatile content. " With the increase of delayed mixing time of two kinds of coal in the furnace, the interaction gradually weakens, the combustion independence of each single coal increases, and the burnout rate of mixed coal approaches to the calculated linear burnout rate. When the mixing time is changed, the burnout rate of the mixed coal varies significantly, and the combustion independence of each single coal is stronger when the volatile content difference is small, but the change of the burning out rate of the mixed coal is not obvious when the mixing time is changed. The NO_x emission of mixed coal decreases with the increase of delayed mixing time.
【作者单位】：华中科技大学煤燃烧国家重点实验室;
【基金】：国家自然科学基金资助项目(51676076)
【分类号】：TQ534;X701

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