煤粉孔隙结构对燃烧过程的影响

提出无形孔模型,建立了控制煤粒燃烧过程的颗粒内部多相燃烧动力学方程、传热和传质方程、流动方程等,对单颗煤粒内部燃烧过程模型进行了数值求解,研究了孔隙率、比表面积、颗粒尺寸、颗粒温度等因素对煤焦反应性和燃烧机理的影响,并与Smith的实验结果进行了比较.

EFFECTS OF POROUS STRUCTURE ON COAL PARTICLE REACTIVITY OF COMBUSTION

Based on shapeless pore model (SPM) proposed by the authors, the equations of heterogeneous combustion kinetics, mass transfer, heat transfer,continuous momentum conservation of flow, which controll coal particle combustion were given. Numerical calculation of single particle combustion was made,and the effects of porosity,pore area, particle size and temperature on reactivities of chars were studied. It was found that ignition was heavily related to pore area ,and was less related to porosity. The results were compared with the data of Smith. It was shown that SPM could be applied both to coal particle combustion and to heterogeneous reaction of other porous materials.