不同煤种挥发氮析出过程的数值模拟与试验研究

采用数值模型研究了烟煤、贫煤和无烟煤等不同煤种热解、燃烧过程中挥发分氮的析出、中间含氮产物HCN的生成以及转变为NO的过程。利用有限体积方法对质量、化学组分、动量和热量守恒方程进行离散求解。计算获得了不同煤种的颗粒着火时间、热解过程、孔隙率、HCN和NO生成率等数据，并与沉降炉试验结果进行了比较，分析。

Numerical Simulation and Experimental Study of the Separation-release Process of Volatile Nitrogen from Various Sorts of Coal

With the help of a numerical model a study was carried out regarding the following items. They include the separation release of volatile nitrogen, the generation of intermediate nitrogen containing product HCN and the process of the latter's transformation into NO. All the above took place in the course of pyrolysis and combustion of various types of coal, such as bituminous coal, lean coal and anthracite, etc. A finite volume method was utilized to perform a discrete solution for the equations of mass, chemical components, momentum and heat energy conservation. Through calculations a whole variety of data were obtained, such as the coal particle ignition time of various ranks of coal, pyrolysis process, porosity factor, HCN and NO formation rate, etc. In addition, the above data were also compared with the test results of a subsidence furnace followed by a pertinent analysis.