Abstract: Four common types of woods in historic buildings were selected as research objects, and thermogravimetric experiments were performed at heating rate of 5 K/min. The pyrolysis process of wood is divided into 4 stages, the thermal weightlessness of wood mainly occurs in the second and third stages. The pyrolysis process at different temperature stages was analyzed, the kinetic equation of wood pyrolysis was established, and the pyrolysis kinetic parameters were obtained. The order of wood thermal stability from high to low is as follows: Chinese fir has the best thermal stability, followed by nanmu, white pine and Korean pine have the same stability.

Key words: thermogravimetric analysis, historical wood, pyrolysis, fire accidents, reaction kinetics