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建立了饱和蒸汽下原木除害处理木材中心温度变化规律的理论模型,分析表明蒸汽温度、初始温度、加热时间、原木密度、含水率、半径等因素是升温过程中的主要影响因素,升温所需时间与原木半径平方成正比,与径向导温系数成反比。通过模型的进一步推导,得出了原木中心点最大升温速率时间及最大升温速率的理论表达式。通过模型计算表明,采用饱和蒸汽进行原木热处理具有操作周期上的可行性,通过在最大升温速率点的保温加热可进一步缩短处理周期,提高除害处理的经济性。
The theoretical model was established for the temperature change of wood center under the treatment of saturated steam, and the results showed that the main factors affecting the temperature were the steam temperature, initial temperature, heating time, density of wood, moisture content and radius. The time is proportional to the square of the log radius and inversely proportional to the radial temperature coefficient. Through the further derivation of the model, the theoretical expression of the maximum heating rate time and the maximum heating rate of the log central point is obtained. The model calculation shows that it is feasible to use the saturated steam for the heat treatment of the logs, and the heating cycle at the maximum heating rate can further shorten the treatment cycle and improve the economy of the harm removal treatment.