混煤燃烧过程中的交互作用:过量空气系数对混煤燃尽特性的影响  

Interaction of blended-coal combustion process: Influence of excess air coefficient on burnout characteristics

作　　者：马仑[1] 汪涂维 方庆艳[1] 郭岸龙 王廷旭 谭鹏[1] 张成[1] 陈刚[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《洁净煤技术》2017年第4期42-46,共5页Clean Coal Technology

基　　金：国家自然科学基金资助项目(51676076)

摘　　要：在沉降炉上对无烟煤、贫煤、烟煤、褐煤以及不同配比(25%、50%、75%)混煤开展了过量空气系数对混煤燃尽特性影响的实验研究。结果表明,混煤燃烧中挥发分高的煤对挥发分低的煤存在促进和抑制2种交互作用。"炉外"掺烧方式下,低挥发分煤与高挥发分煤掺混时,抢风抑制作用表现明显;尤其是掺烧75%高挥发分煤时,抢风抑制作用最为显著;提高过量空气系数可以改善贫氧气氛,减弱混煤燃烧中的抢风抑制作用,提高混煤燃尽率。"炉内"掺烧方式下,过量空气系数的增加,交互作用减弱,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。The experiment of the influence of excess air coefficient on the burnout characteristics are performed under four coals and their blended coals（ 0%、25%、50%、75%、100%） The results show that the combustion of blended coal is impacted by two opposite effects： the promote function and the restrain function. Under the out-furnace coal blending method,the interaction of blended coal is obvious when low-volatile coal is blended with high-volatile coals（ especially,under the blending ratio of 75%）. Enhancing the excess air coefficient can weaken the restrain function. Under the in-furnace coal blending method,when low-volatile coal is blended with high-volatile coals,as increasing the excess air coefficient,the restrain function is also lower,and the combustion independence of individual coals gradually increases,and the burnout of blended coal approaches the linear value.

关 键 词：混煤掺烧 过量空气系数 燃尽特性 交互作用 

分 类 号：TK16[动力工程及工程热物理—热能工程]