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| 含水率对微波干燥过程中木材内蒸汽压力与温度的影响 | |
| 引用本文： | 刘志军,张璧光,芦春莲.含水率对微波干燥过程中木材内蒸汽压力与温度的影响[J].河北农业大学学报,2007,30(1):101-104. |
| 作者姓名： | 刘志军 张璧光 芦春莲 |
| 作者单位： | 1. 河北农业大学,林学院,河北,保定,071000;北京林业大学,材料科学与技术学院,北京,100083 2. 北京林业大学,材料科学与技术学院,北京,100083 3. 河北农业大学,林学院,河北,保定,071000 |
| 摘 要： | 以马尾松为试验对象,研究了微波干燥过程中,初含水率对木材内部温度、水蒸气压力的影响,旨在为微波干燥过程中木材干燥质量的控制提供依据。研究结果表明:在微波辐射功率相同的条件下,不同初含水率的木材内部蒸汽达到最大值的时间很接近,并且木材初含水率越高,木材内部蒸汽压力上升越快,压力峰值越大,最大压力值保持的时间越短,蒸汽压力下降的越迅速。木材在微波加热过程中,木材温度达到恒温段之前,压力上升比较缓慢,达到恒温段之后,压力迅速上升,很快达到最大压力值。木材初含水率高,压力峰值大,其相应的温度也高。 |
| 关 键 词： | 微波干燥 含水率 蒸汽压力 温度 马尾松 |
| 文章编号： | 1000-1573(2007)01-0101-04 |
| 修稿时间： | 2006年9月5日 |
Effect of moisture content on steam pressure and temperature in wood during microwave drying |
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| LIU Zhi-jun,ZHANG Bi-guang,LU Chun-lian.Effect of moisture content on steam pressure and temperature in wood during microwave drying[J].Journal of Agricultural University of Hebei,2007,30(1):101-104. | |
| Authors: | LIU Zhi-jun ZHANG Bi-guang LU Chun-lian |
| Abstract: | The experimental material is based on the Masson pine.The research is concerned about the impact of initial moisture content to the inner-temperature,steam pressure during microwave drying.The study is meant to provide reference in controlling drying quality of wood during microwave drying.Results obtained are summarized as follows: under the condition of the same microwave power,the time when the steam pressure comes to the maximum is close if the initial moisture content is different.And the higher the initial moisture content is,the quicker the inner steam pressure increases,the higher the peak value,the holding time of maximal pressure becomes shorter,the steam pressure goes down quicker.During the microwave heating and before the temperature reaches to the constant value,the steam pressure increases slowly.When the temperature reaches to the constant value stage,the pressure increases sharply and reaches the maximum in a short time.If the initial moisture content is high,the peak value of pressure is high,respectively the temperature is high too. |
| Keywords: | microwave drying moisture content steam pressure temperature Masson pine |
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