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摘要
Mills experience reduced kiln productivity in drying sub-alpine fir lumber. High-temperature drying is an effective approach to accelerate the process. Thermal modification improves the dimensional stability and decay resistance. During these processes, two distinct stages, wood heating and water vaporization, were encountered. This research was aimed at developing a method to evaluate the vaporization process using an approximate analytic solution. The heating process was predicted by combining the analytic solution with numeric simulation. Using a scanning electron microscope, the impact of vaporization on wood micro-structure was examined. The vaporization process was able to open the aspirated pits and break the membranes. Laboratory drying experiments confirmed that the program could obtain satisfactory estimations of heating rates and times. The results indicated that the vaporization time is a function of the moisture content and size of the lumber, the temperature and air velocity in the kiln.
- 出版日期2011
- 单位南京林业大学
