燃煤烟气对工业煤粉复合火焰的惰化抑爆机理研究

The fire and explosion accidents of pulverized coal preparation system happened frequently at home and abroad,which have not been effectively controlled, and restrainted safety production and sustainable development of related coal-burned industries eventually. The hybrid combustion flow field of the pulverized coal preparation system was taken as the investigated object, and the explosion reaction dynamics and isolation technology on transient flame field were applied together to explore the influence of industrial fuel gas on the hybrid flame structure and dynamic behavior transition. Especially, the work was focused on the inerting mechanism of industrial gas on coal flame, such as the interference effect of fuel gas on gas-solid two phase flow flame of hybrid coal flame. In addition, the hybris explosion flame structure and the propagation behavior were also investigated. Finally, the correlation between the coal explosion dynamic parameters and the micro flow field structure under the condition of industrial gas atmosphere was obtained. The study aims to build up the inerting model of industial gas on coal flame structure, and further to disclose the combustion inerting and explosion suppressing of industrial fuel gas on coal flame, which will finally provide theoretical basis for the explosion suppresion design of pulverized coal preparation system.

国内外工业煤粉制备系统爆炸事故频发的严峻形势一直未得到有效控制，严重制约着相关行业的安全生产与可持续发展。本研究以工业制粉系统煤粉复合火焰流场为对象，将爆炸反应动力学等理论与瞬态流场诊断技术相结合，研究多物理场耦合下工业烟气对煤粉复合火焰结构及动力学灾变行为的影响规律；重点研究烟气对煤粉复合火焰的惰化机理，探索烟气对煤粉爆炸两相流火焰的干涉与抑制效应，以及废烟气氛围下煤粉与挥发分的爆炸火焰结构与传播特性，并解析烟气抑制下的煤粉爆炸表观动力学参数与流场微观结构之间的相关性。本研究旨在构建燃煤火焰结构的烟气惰化模型，揭示工业废烟气对煤粉复合火焰的惰化与抑爆机理，从而为工业制粉系统防爆设计提供理论基础与实验依据。

工业煤粉制备系统爆炸事故频发的严峻形势一直未得到有效控制，严重制约着相关行业的安全生产与可持续发展。本研究采用中长尺寸实验平台并自主设计了烟气加载装置，将烟气加载引入管道固定区域，通过热力学理论确定了加载压力与惰化层厚度的对应关系。以工业制粉系统煤粉复合火焰流场为对象，将爆炸反应动力学等理论与瞬态流场诊断技术相结合。利用光学诊断技术、微细热电偶、离子探针技术等测试手段，研究多物理场耦合下工业烟气对煤粉复合火焰结构及动力学灾变行为的影响规律。研究了工业烟气在复合火焰传播过程中的抑制效应，定量确定了可以有效阻断火焰传播的抑制参数。通过同步热分析技术及对煤粉爆炸残留物的化学表征，系统地总结了烟气对煤粉复合火焰的惰化和抑爆机理。本研究成果为工业生产提供了一种新的抑爆方式，实现了节能减排及工业废气的综合利用，构建了燃煤火焰结构的烟气惰化模型，为工业制粉系统防爆设计提供理论基础与实验依据。