Abstract:

To improve the yield rate of tar during coal pyrolysis,the pyrolysis process and principle of long flame coal with different grain size under different final pyrolysis temperature and heating up rate are studied by non-isothermal thermogravimetric method.The pyrolysis characteristic of long flame is analyzed at the heating rate of 20 and 100℃/min,and the pyrolysis kinetic parameters are worked out.The result shows that  when the coal particle is smaller than 2.8mm,grain size of coal has little effect to the pyrolysis process; the volatile matter yield rate in the final solid product decreases while final pyrolysis temperature increases; and the separating out rate of volatile matter increases with heating rate.At the same heating rate,the relationship between activation energy and pyrolysis temperature can be expressed by a curve which increases firstly and then decreases.The pre-exponetial factor increases with activation energy.